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JP2008177980

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2008177980
PROBLEM TO BE SOLVED: To obtain a sound image with a sense of spread. Get an audio output
that is faithful to the audio signal. Increase the freedom to select the shape of the acoustic
diaphragm. A displacement output transmission member 134 is interposed between a drive rod
103 a of a magnetostrictive actuator 103 and a pipe (acoustic diaphragm) 102. The transmission
member 134 has a U-shaped member 134 a connected to the drive rod 103 a and a screw (rodlike member) 134 b connecting the U-shaped member 134 a to the excitation point P of the pipe
102. The transmission member 134 connects the drive rod 103 a of the actuator 103 to the
excitation point P on the surface of the pipe 102. The displacement output of the actuator 103 is
transmitted to the excitation point P of the pipe 102 through the transmission member 134, and
the pipe 102 is moved from the excitation point P in the surface direction (the pipe of the pipe
102 Excitation in the direction parallel to the surface). [Selected figure] Figure 7
Speaker device
[0001]
The present invention relates to a speaker device. More specifically, the present invention
transmits the displacement output of the actuator to a predetermined point on the surface of the
acoustic diaphragm via the displacement output transmission member, and the acoustic
diaphragm from the above-mentioned predetermined point corresponding to the displacement
output of the actuator By vibrating in the plane direction, it is possible to obtain a sound image
with a sense of spreading, and to obtain an audio output faithful to an audio signal, and to further
increase the freedom in selecting the shape of the acoustic diaphragm. Relates to the speaker
device.
12-05-2019
1
[0002]
Conventionally, as described in, for example, Patent Document 1 etc., there is known an audio
output device which drives a diaphragm with a magnetostrictive actuator to obtain an audio
output. The magnetostrictive actuator is an actuator using a magnetostrictive element whose
shape changes when an external magnetic field is applied.
[0003]
FIG. 19 shows a configuration example of an audio output device 300 using a magnetostrictive
actuator. The audio output device 300 includes a player 301, an amplifier 302, a
magnetostrictive actuator 303, and a diaphragm 304. Here, the magnetostrictive actuator 303
and the diaphragm 304 constitute a speaker device 305.
[0004]
The player 301 reproduces, for example, a CD (Compact Disc), an MD (Mini Disc), a DVD (Digital
Versatile Disc) or the like, and outputs an audio signal. The audio signal output from the player
301 is amplified by the amplifier 302 and then supplied to the magnetostrictive actuator 303.
The magnetostrictive actuator 303 has a drive rod 303 a for transmitting a displacement output,
and the tip of the drive rod 303 a is in contact with the diaphragm 304.
[0005]
The magnetostrictive actuator 303 drives the diaphragm 304 based on the audio signal. That is,
the drive rod 303 a of the magnetostrictive actuator 303 is displaced corresponding to the sound
signal waveform, and the displacement is transmitted to the diaphragm 304. Thereby, from the
diaphragm 304, an audio output corresponding to the audio signal is obtained. UnexaminedJapanese-Patent No. 04-313999
[0006]
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2
In the speaker device 305 in the above-described audio output device 300, the drive rod 303 of
the magnetostrictive actuator 303 is brought into contact with the plate surface of the
diaphragm 304, and this diaphragm 304 is applied with a vibration component in a direction
orthogonal to the plate surface. By shaking, voice output is obtained.
[0007]
In this case, since the diaphragm 304 is greatly excited at the excitation point, the sound wave
from the excitation point can be heard as a much louder sound than other positions from the
viewpoint of the viewer.
As a result, the sound image was localized at the excitation point, and it was not possible to
obtain a sound image having a sense of spread.
[0008]
An object of the present invention is to provide a speaker device capable of obtaining a sound
image with a sense of expansion, obtaining an audio output faithful to an audio signal, and
further increasing the freedom in selecting the shape of an acoustic diaphragm. To provide.
[0009]
The concept of the present invention includes: an acoustic diaphragm; an actuator having a
displacement output unit driven based on an audio signal and capable of obtaining a
displacement corresponding to the audio signal; and a displacement output unit of the actuator
on the surface of the acoustic diaphragm. A displacement output transmission member
connected to the predetermined point on the upper surface, the displacement output of the
actuator is transmitted to the predetermined point on the surface of the acoustic diaphragm via
the displacement output transmission member, and the displacement output of the actuator is
detected. Correspondingly, the above-mentioned acoustic diaphragm is excited in the surface
direction from the above-mentioned predetermined point.
[0010]
The speaker device of the present invention includes an acoustic diaphragm, an actuator, and a
displacement output transmission member.
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3
The actuator is driven based on the audio signal.
The displacement output of the actuator is transmitted to a predetermined point on the surface
of the acoustic diaphragm via the displacement output transmission member. Then, the acoustic
diaphragm is oscillated in the surface direction from a predetermined point on the surface,
corresponding to the displacement output of the actuator. Here, the surface direction of the
acoustic diaphragm means a direction parallel to the surface. As the actuator, for example, a
magnetostrictive actuator, an electrodynamic actuator, a piezoelectric actuator or the like is used.
[0011]
By vibrating the acoustic diaphragm in the surface direction, an elastic wave based on the audio
signal propagates in the surface direction through the acoustic diaphragm. Then, when the elastic
wave propagates through the acoustic diaphragm, mode conversion of longitudinal waves,
transverse waves, longitudinal waves,... Is repeated to become a mixed wave of longitudinal
waves and transverse waves, and the transverse waves make the in-plane direction of the
acoustic diaphragm by the transverse waves. Vibrations (in the direction perpendicular to the
plane) are excited. Thereby, a sound wave is radiated to the outside from the surface of the
acoustic diaphragm, and an audio output is obtained.
[0012]
The acoustic diaphragm is excited in the surface direction, and no large transverse wave is
generated at the excitation point, and the sound wave emitted from this excitation point is much
larger than the sound wave emitted from other positions. The sound image is localized over the
entire acoustic diaphragm without being heard as a sound, and it is possible to obtain a sound
image with a sense of spread.
[0013]
Also, the displacement output of the actuator is transmitted to a predetermined point on the
surface of the acoustic diaphragm via the displacement output transmission member, and for
example, the one in which the displacement output portion of the actuator is simply in contact
with the end surface of the acoustic diaphragm In comparison, the displacement output of the
actuator can be transmitted faithfully to the acoustic diaphragm, and an audio output faithful to
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the audio signal can be obtained, and the shape of the acoustic diaphragm is, for example,
spherical or box-shaped without an end face The degree of freedom in selecting the shape of the
acoustic diaphragm can be increased.
[0014]
For example, the displacement output transmission member includes a U-shaped member
connected to the displacement output portion of the actuator, and an end portion of the acoustic
diaphragm inserted in the U-shaped member, the U-shaped member and the acoustic vibration It
has a rod-like member which penetrates the plate and connects the U-shaped member and the
acoustic diaphragm.
In this case, the displacement output of the actuator can be transmitted from both sides of the
acoustic diaphragm to the predetermined point (excitation point) of the acoustic diaphragm by
the U-shaped member, and stable transmission of the displacement output of the actuator
becomes possible.
[0015]
Also, for example, the displacement output transmission member has a rod-like member which
penetrates the displacement output portion of the actuator and the acoustic diaphragm and
connects the displacement output portion and the acoustic diaphragm.
In this case, the actuator can be disposed on one side of the acoustic diaphragm, and even an
acoustic diaphragm having a spherical shape, a box shape, or the like having no end portion can
be applied.
[0016]
For example, the speaker device further includes a biasing structure that constantly biases the
actuator in the surface direction. In this case, when the contact portion of the acoustic diaphragm
with the displacement output transmission member is scraped for a long period of use, and the
rattle occurs in the contact portion, the displacement output transmission member can be
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5
pressed against the acoustic diaphragm, so that the acoustic vibration is generated. It becomes
possible to excite the plate well in the plane direction.
[0017]
For example, the actuator has a first displacement output section at one end and a second
displacement output section at the other end. The first and second displacement output units are
connected to the first and second points of the acoustic diaphragm via the first and second
displacement output transmitting members. In this case, since two excitation points are provided
to the acoustic diaphragm by one actuator, it is possible to enhance the sense of the spread of the
sound image.
[0018]
For example, a plurality of actuators are provided. The displacement outputs of the plurality of
actuators are transmitted to different points on the surface of the acoustic diaphragm by the
plurality of displacement output transmitting members. For example, non-directionality can be
obtained by driving a plurality of actuators based on the same audio signal. Also, for example, a
plurality of actuators obtained by independently adjusting the levels, delay times, frequency
characteristics, etc. of independent audio signals, for example, audio signals of a plurality of
channels, or the same audio signal. By driving based on the audio signal or the like, it is possible
to perform sound field processing that enhances the sense of sound spread.
[0019]
According to the present invention, the displacement output of the actuator is transmitted to a
predetermined point on the surface of the acoustic diaphragm via the displacement output
transmission member, and the acoustic diaphragm is surfaced from the above-mentioned
predetermined point corresponding to the displacement output of the actuator. It is possible to
obtain a sound image with a sense of expansion, obtain a sound image with a sense of expansion,
obtain an audio output faithful to an audio signal, and further increase the freedom in selecting
the shape of the acoustic diaphragm. it can.
[0020]
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6
An embodiment of the present invention will be described.
1 to 4 show the configuration of a speaker device 100A as an embodiment. 1 is a perspective
view of the speaker device 100A, FIG. 2 is a longitudinal sectional view of the speaker device
100A, FIG. 3 is a top view of the speaker device 100A, and FIG. 4 is a bottom view of the speaker
device 100A.
[0021]
The speaker device 100A includes a base housing 101, a pipe 102, a magnetostrictive actuator
103 as an actuator, a displacement output transmission member 134, and a speaker unit 105
using an electrodynamic actuator as a sound generator. ing. The pipe 102 constitutes a
cylindrical diaphragm as an acoustic diaphragm. The drive rod 103 a of the magnetostrictive
actuator 103 constitutes a displacement output unit to obtain a displacement output
corresponding to the audio signal for driving the magnetostrictive actuator 103.
[0022]
The base housing 101 is formed of, for example, a synthetic resin. The base housing 101 is
formed in a disk shape as a whole, but an opening 105 penetrating in a cylindrical shape is
provided at the center portion thereof. Along the outer periphery of the lower surface of the base
housing 101, a predetermined number of, in this embodiment, three leg portions 106 are planted
at equal angular intervals.
[0023]
When the number of the legs 106 is three, since the three legs 106 are always in contact with
the installation surface, stable installation is possible as compared with, for example, the case
where four legs are provided. Further, by providing the leg portion 106 on the lower surface of
the base housing 101, the lower surface of the base housing 101 can be separated from the
installation surface, and the sound wave from the speaker unit 104 attached to the lower surface
side of the base housing 101. Makes it possible to radiate outside.
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[0024]
The pipe 102 is formed of a predetermined material, such as transparent acrylic. The pipe 102 is
fixed to the base housing 101. That is, the lower end portion of the pipe 102 is fixed to the upper
surface of the base casing 101 using a metal L-shaped angle 107 at a plurality of places, four
places in this embodiment. The size of the pipe 102 is, for example, 1000 mm in length, 100 mm
in diameter, and 2 mm in thickness.
[0025]
In this case, although not shown, round holes for screwing are formed at one end and the other
end of the L-shaped angle 107. One end of the L-shaped angle 107 is screwed to the upper
surface of the base housing 101 using a screw 109. The base housing 101 is formed with a
screw hole (not shown) to be screwed with the screw portion of the screw 109. In this case,
between one end of the L-shaped angle 107 and the upper surface of the base housing 101, a
damping material 108 composed of a ring-shaped rubber material or the like is interposed.
[0026]
The other end of the L-shaped angle 107 is screwed to the lower end of the pipe 102 using a
screw 110 and a nut 111. At the lower end portion of the pipe 102, a circular hole (not shown)
for passing the screw portion of the screw 110 is formed. Between the other end of the L-shaped
angle 107 and the outer surface of the pipe 102 and between the nut 111 and the inner surface
of the pipe 102, damping members 112 and 113 composed of a ring-shaped rubber material or
the like are respectively interposed. Be done.
[0027]
Thus, by interposing the damping members 108, 112, 113, it is possible to prevent the vibration
(elastic wave) by the magnetostrictive actuator 103 from propagating to the base casing 101
through the pipe 102 and the L-shaped angle 107, and the base casing Sound image localization
to the 101 side is prevented.
[0028]
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A plurality of, in the present embodiment, four magnetostrictive actuators 103 are disposed in
the base casing 101.
The four magnetostrictive actuators 103 are arranged at equal intervals along the circular end
face on the lower end side of the pipe 102. The base housing 101 is provided with a through
storage hole 114. The magnetostrictive actuator 103 is housed in the housing hole 114. As
described above, the drive rod 103a of the magnetostrictive actuator 103 can obtain a
displacement output corresponding to the audio signal. The magnetostrictive actuator 103 is
disposed such that the displacement direction of the drive rod 103 is the surface direction of the
pipe 102 (the direction parallel to the surface of the pipe 102).
[0029]
FIG. 5 shows a configuration example of the magnetostrictive actuator 103. As shown in FIG. The
magnetostrictive actuator 103 is a bar-like magnetostrictive element 151 which is displaced in
the extension direction, a solenoid coil 152 as a magnetic field generating portion disposed
around the magnetostrictive element 151 to apply a control magnetic field to the
magnetostrictive element 151, and magnetostrictive. The drive rod 103a is a movable member
connected to one end of the element 151 to obtain a displacement output of the magnetostrictive
actuator 103, and a housing portion 154 for housing the magnetostrictive element 151 and the
solenoid coil 152.
[0030]
The storage unit 154 is configured of a fixed plate 161, a permanent magnet 162, and a
cylindrical case 163. The other end of the magnetostrictive element 151 is connected to the fixed
board 161, and the magnetostrictive element 151 is supported by the fixed board 161. A
permanent magnet 162 for applying a static bias magnetic field to the magnetostrictive element
151 and a cylindrical case 163 as a magnetic circuit component are disposed around the
magnetostrictive element 151 to be accommodated. The cylindrical case 163 is attached to the
drive rod 103 a side of the permanent magnet 162 and the fixed disc 161 side, and by using a
ferromagnetic material, a static bias magnetic field can be efficiently applied to the
magnetostrictive element 151. In addition, the static bias magnetic field can be applied to the
magnetostrictive element 151 more efficiently by forming the fixed board 161 also using a
ferromagnetic material.
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[0031]
A gap 155 is provided between the drive rod 103 a and the housing portion 154, and the drive
rod 103 a is formed using a ferromagnetic material so as to be attracted by the permanent
magnet 162. As a result, a magnetic attraction force is generated between the drive rod 103a and
the housing portion 154, and a preload is applied to the magnetostrictive element 151 attached
to the drive rod 103a by the magnetic attraction force.
[0032]
FIG. 6 shows a magnetic flux diagram of the magnetostrictive actuator 103 shown in FIG. The
magnetic flux lines generated from the permanent magnet 162 pass through the cylindrical case
163, and then travel toward the permanent magnet 162 through the gap 155, the drive rod
103a, and the fixed plate 161. For this reason, a magnetic attraction force is generated between
the drive rod 103 a and the housing portion 154, and a preload is applied to the
magnetostrictive element 151 by the magnetic attraction force. In addition, part of the magnetic
flux lines pass through the cylindrical case 163 and then travel toward the permanent magnet
162 through the gap 155, the drive rod 103a, the magnetostrictive element 151, and the fixed
plate 161. Therefore, a static bias magnetic field can be applied to the magnetostrictive element
151.
[0033]
In the magnetostrictive actuator 103 shown in FIG. 5, since the drive rod 103a is not supported
by the bearing, there is no problem of friction between the drive rod 103a and the bearing, and
therefore the loss of displacement output can be significantly reduced.
[0034]
Further, in the magnetostrictive actuator 103, since the preload is applied to the magnetostrictive
element 151 by the magnetic attraction force, the preload can be stably continued even if the
period of the displacement of the magnetostrictive element 151 is short, The displacement
output according to the control current supplied to the solenoid coil 152 can be obtained
correctly.
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[0035]
Therefore, in the magnetostrictive actuator 103, since the relationship between the control
current flowing through the solenoid coil 152 and the displacement of the drive rod 103a
approaches a linear relationship, distortion generated by the characteristics of the
magnetostrictive actuator 103 is reduced, and thus feedback correction Reduce the burden of
[0036]
Further, in this magnetostrictive actuator 103, since the permanent magnet 162 is interposed
between the two cylindrical cases 163, the static bias magnetic field applied to the
magnetostrictive element 151 is fixed to the position of the fixed board 161. It can be made
uniform compared with the case of providing.
Furthermore, there is no need to provide a bearing for supporting the drive rod 103a, a
connecting member for connecting the drive rod 103a and the storage portion 154, a spring for
applying a preload to the magnetostrictive element 151, etc., and miniaturization is easy. Can be
configured inexpensively.
[0037]
Referring back to FIGS. 1 to 4, the displacement output transmission member 134 is interposed
between the drive rod 103 a of the magnetostrictive actuator 103 and the pipe 102.
The displacement output transmission member 134 connects the drive rod 103 a of the
magnetostrictive actuator 103 to an excitation point which is a predetermined point on the pipe
surface of the pipe 102.
In this case, since the displacement output of the magnetostrictive actuator 103 is transmitted to
the excitation point of the pipe 102 through the displacement output transmission member 134,
the pipe 102 is moved from the excitation point to the surface corresponding to the displacement
output of the magnetostrictive actuator 103. It becomes possible to excite in the direction.
[0038]
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11
FIG. 7 shows a connection structure of the drive rod 103 a of the magnetostrictive actuator 103
and the pipe 102 by the displacement output transmission member 134. The displacement
output transmission member 134 has a U-shaped member 134 a and a screw 134 b as a rod-like
member. The U-shaped member 134 a is connected to the drive rod 103 a of the actuator 102. In
this case, the closed end side of the U-shaped member 134a is connected to the tip of the drive
rod 103a by a method such as adhesion or screwing. In the case of screwing, for example, a
screw hole in which a female screw is cut on the closed end side of the U-shaped member 134a is
provided, and a male screw corresponding to the female screw in the screw hole is provided at
the tip of the drive rod 103a. It is cut.
[0039]
The connection between the U-shaped member 134a and the excitation point P of the pipe 102
is made using a screw 134b. That is, the end of the pipe surface of the pipe 102 is inserted into
the U-shaped member 134a, and screwed with a screw 134b so as to penetrate the pipe surfaces
of the U-shaped member 134a and the pipe 102. In this case, the U-shaped member 134a is
provided with an internally threaded screw hole into which the male screw of the screw 134b is
screwed, and the screw 134b is provided at a position corresponding to the excitation point P on
the pipe surface of the pipe 102. There is a through hole for letting through.
[0040]
As described above, the magnetostrictive actuator 103 is housed in the penetrating housing hole
114 provided in the base housing 101. The back surface side opposite to the side where the
drive rod 103 a of the magnetostrictive actuator 103 is present is slightly protruded to the lower
surface side of the base housing 101, and screwed with a screw 117 to the lower surface side of
the base housing 101. It is in a state of being pressed by the leaf spring 118.
[0041]
As described above, when the back surface side of the magnetostrictive actuator 103 is pressed
by the plate spring 118, the magnetostrictive actuator 103 is always urged in the surface
direction of the pipe 102. In this case, the contact portion of the pipe 102 with the screw 134 b
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12
constituting the displacement output transmission member 134 is scraped in long-term use, and
when the rattle occurs in the contact portion, the screw 134 b can be pressed against the pipe
102 The pipe 102 can be vibrated in the surface direction.
[0042]
A leaf spring 118 attached to the lower surface of the base housing 101 constitutes a biasing
structure that always biases the magnetostrictive actuator 103 in the surface direction of the
pipe 102. The biasing structure is not limited to the above-described structure using the plate
spring 118, and may be any structure that always biases the magnetostrictive actuator 103 in
the surface direction of the pipe 102. For example, a storage hole having a bottom surface
instead of the through storage hole 114 may be used, and a structure in which a compression
coil spring is disposed between the bottom surface of the storage hole and the back side of the
magnetostrictive actuator 103 stored in the storage hole may be considered. .
[0043]
The pipe 102 and the magnetostrictive actuator 103 described above constitute a speaker that is
responsible for the high frequency side of the audio frequency band, and functions as a tweeter.
On the other hand, the speaker unit 104 constitutes a speaker in charge of the low frequency
side of the audio frequency band and functions as a woofer.
[0044]
The speaker unit 104 is attached at a position corresponding to the opening 105 on the lower
surface side of the base housing 101, for example, using a screw (not shown) with the front
surface facing downward. In this case, the direction of the central axis of the speaker unit 104
coincides with the axial direction of the pipe 102. The sound wave of positive phase output from
the front surface of the speaker unit 104 is radiated to the outside from the lower surface side of
the base housing 101. Also, sound waves of reverse phase outputted from the back surface of the
speaker unit 104 are radiated from the upper end side of the pipe 102 to the outside through the
opening 105 and the pipe 102. In this case, the pipe 102 functions as a resonance tube, enabling
a low-pass reproduction with a sense of volume.
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[0045]
A damping material 116 made of, for example, a rubber material is disposed between the end
face of the lower end portion of the pipe 102 and the base housing 101. The damping member
116 can increase the degree of sealing so that the pipe 102 functions well as a resonance pipe
while preventing the vibration of the magnetostrictive actuator 103 from propagating to the base
housing 101 through the pipe 102.
[0046]
FIG. 8 shows the configuration of the drive system of the four magnetostrictive actuators 103
and the speaker unit 104.
[0047]
The left audio signal AL and the right audio signal AR constituting the stereo audio signal are
supplied to the adder 121, where the audio signals AL and AR are combined to generate a
monaural audio signal SA.
A high pass component SAH is extracted from the monaural sound signal SA by the high pass
filter 122. The high frequency component SAH is corrected in frequency characteristics
corresponding to the magnetostrictive actuator 103 by the equalizer 123, and further amplified
by the amplifiers 124-1 to 124-4, and then supplied to the four magnetostrictive actuators 103
as drive signals. Be done. As a result, the four magnetostrictive actuators 103 are driven by the
same high frequency component SAH, and the respective drive rods 103a are displaced
corresponding to the high frequency component SAH.
[0048]
Further, the low pass component SAL is extracted by the low pass filter 125 from the monaural
sound signal SA generated by the adder 121. The low frequency component SAL is subjected to
correction of the frequency characteristic corresponding to the resonance tube comprising the
pipe 102 by the equalizer 126, delayed by the delay circuit 127 having a delay time of several
milliseconds, and further amplified by the amplifier 128. , And is supplied to the speaker unit
104 as a drive signal. Thus, the speaker unit 104 is driven by the low frequency component SAL.
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[0049]
By inserting the delay circuit 127 into the supply path of the low frequency component SAL to
the speaker unit 104, the time point when the low frequency sound wave is emitted from the
speaker unit 104 from the time when the high frequency sound wave is emitted from the pipe
102 is Become slow. Therefore, from the human auditory feature that the sound image is drawn
in the high region, the viewer can easily feel the sound image in the portion of the pipe 102
where the sound wave in the high region is emitted.
[0050]
The operation of the speaker device 100A shown in FIGS. 1 to 4 will be described.
[0051]
The four magnetostrictive actuators 103 housed and fixed in the base housing 101 are driven by
the high frequency component SAH of the monaural sound signal SA, and their drive rods 103a
are displaced corresponding to the high frequency component SAH.
The displacement of the drive rod 103 a (displacement output of the actuator 103) is transmitted
to the excitation point P (see FIG. 7) on the surface of the pipe 102 via the displacement output
transmission member 134. Therefore, the pipe 102 is excited in the surface direction from the
excitation point P in response to the displacement output of the actuator 103.
[0052]
In this case, the excitation point P of the pipe 102 is excited by a longitudinal wave, and an
elastic wave (vibration) propagates in the surface direction through the pipe 102. Then, when the
elastic wave propagates through the pipe 102, the mode conversion of longitudinal waves,
transverse waves, longitudinal waves,... Is repeated to become a mixed wave of longitudinal
waves and transverse waves, and the transverse waves of the pipe 102 in the in-plane direction
(surface Vibration in the vertical direction) is excited. Thereby, sound waves are emitted from the
pipe 102. That is, from the outer surface of the pipe 102, a high frequency sound output
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corresponding to the high frequency component SAH is obtained.
[0053]
In this case, since the four magnetostrictive actuators 103 arranged at equal intervals along the
circular end face on the lower end side of the pipe 102 are driven by the same high-frequency
component SAH, the entire circumference of the pipe 102 Non-directional, high-frequency audio
output can be obtained.
[0054]
In addition, the speaker unit 104 attached to the lower surface side of the base housing 101 is
driven by the low frequency component SAL of the monaural sound signal SA.
A low frequency audio output (normal phase) is obtained from the front surface of the speaker
unit 104, and this audio output is radiated from the lower surface side of the base housing 101
to the outside. Also, a low frequency audio output (reverse phase) is obtained from the back of
the speaker unit 104, and this audio output is radiated from the upper end side of the pipe 102
to the outside through the opening 105 and the pipe 102.
[0055]
According to the speaker device 100A shown in FIGS. 1 to 4, the magnetostrictive actuator 103
driven by the high frequency component SAH of the monaural audio signal SA excites the pipe
102 in the surface direction from the excitation point P It is. Therefore, a large transverse wave is
not generated at the excitation point P, and the sound wave from the excitation point P is not
heard as a very loud sound as compared to the sound waves emitted from other positions. A
sound image can be localized over the entire longitudinal direction, and a sound image with a
sense of spread can be obtained.
[0056]
Further, according to the speaker device 100A shown in FIGS. 1 to 4, the displacement output of
the magnetostrictive actuator 103 is transmitted to the excitation point P on the pipe surface of
the pipe 102 via the displacement output transmission member 134. The displacement output of
the magnetostrictive actuator 103 can be transmitted to the pipe 102 more faithfully than, for
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example, the drive rod 103a of the magnetostrictive actuator 103 is simply brought into contact
with the end face of the pipe 102. You can get the output.
[0057]
For example, the case where an audio signal as shown in FIG. 9A is input to the magnetostrictive
actuator 103 will be considered.
In this case, as in the speaker device 100A shown in FIGS. 1 to 4, the displacement output of the
magnetostrictive actuator 103 is transmitted to the excitation point P on the pipe surface of the
pipe 102 through the displacement output transmission member 134. In this case, the exciting
motion of the pipe 102 follows the displacement motion of the drive rod 103a in both the
upward and downward directions well. Therefore, the amplitude response in the surface direction
of the pipe 102 is as shown in FIG. 9C, and it is possible to obtain an audio output faithful to the
audio signal from the pipe 102.
[0058]
On the other hand, when the drive rod 103a of the magnetostrictive actuator 103 is simply
brought into contact with the end face of the pipe 102, the excitation operation of the pipe 102
favorably follows the upward displacement of the drive rod 103a. The excitation operation of the
pipe 102 does not follow the downward displacement operation of 103a. Therefore, the
amplitude response in the surface direction of the pipe 102 is as shown in FIG. 9B, and it
becomes difficult to obtain an audio output faithful to the audio signal from the pipe 102.
[0059]
Further, according to the speaker device 100A shown in FIGS. 1 to 4, the displacement output
transfer member 134 is a U-shaped member 134a connected to the drive rod 103a of the
magnetostrictive actuator 103, and the inside of the U-shaped member 134a. When the end of
the pipe surface of the pipe 102 is inserted, the U-shaped member 134a and the pipe surface of
the pipe 102 are penetrated, and the screw 134b for connecting the U-shaped member 134a and
the pipe 102 is provided. Accordingly, the displacement output of the magnetostrictive actuator
103 can be transmitted from both sides of the pipe surface of the pipe 102 to the excitation
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point P on the pipe surface of the pipe 102 by the U-shaped member 134a, and the displacement
output of the magnetostrictive actuator 103 It can be stably transmitted to the excitation point P
on the tube surface.
[0060]
According to the speaker device 100A shown in FIGS. 1 to 4, the displacement output member
134 is configured using the U-shaped member 134a, but in the vertical direction with respect to
the pipe 102 with the excitation point P as a fulcrum The shape does not have to be U-shaped as
long as good vibration can be given. For example, the displacement output member 134 can also
be configured using an L-shaped member or the like in which one side of the U-shaped member
134a is not provided.
[0061]
Further, according to the speaker device 100A shown in FIGS. 1 to 4, the displacement output
member 134 is configured by the U-shaped member 134a and the screw 134b, and the U-shaped
member 134a is connected to the pipe (diaphragm) 102 by the screw 134b. The pipe 102 can be
easily attached and detached.
[0062]
In the above, the drive system of the magnetostrictive actuator 103 and the speaker unit 104 is
configured as shown in FIG. 8, and the four magnetostrictive actuators 103 are driven by the
same high frequency component SAH.
However, these four magnetostrictive actuators 103 can be driven by independent high
frequency components SAH.
[0063]
FIG. 10 shows another configuration of drive systems of the four magnetostrictive actuators 103
and the speaker unit 104. In FIG. 10, parts corresponding to FIG. 8 are given the same reference
numerals, and the detailed description thereof will be omitted.
12-05-2019
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[0064]
The high frequency components SAH extracted by the high pass filter 122 are supplied to four
signal processing units 129-1 to 129-4. The signal processing units 129-1 to 129-4
independently perform processing (sound field control processing) for adjusting the level, delay
time, frequency characteristics and the like on the high frequency component SAH, and the
magnetostrictive actuator Signal correction processing relating to the output characteristic of
103 is performed. The high frequency components SAH1 to SAH4 output from the signal
processing units 129-1 to 129-4 are respectively amplified by the amplifiers 124-1 to 124-4 and
then supplied to the four magnetostrictive actuators 103 as drive signals. Ru. As a result, the four
magnetostrictive actuators 103 are driven by independent high frequency components SAH1 to
SAH4, and the drive rods 103a are displaced corresponding to the high frequency components
SAH1 to SAH4.
[0065]
In addition, the low frequency component SAL extracted by the low pass filter 125 is supplied to
the signal processing unit 130. In the signal processing unit 130, processing (sound field control
processing) for adjusting the level, delay time, frequency characteristics and the like is performed
on the low frequency component SAL, and signal correction processing relating to resonance
tube characteristics is performed. The low frequency component output from the signal
processing unit 130 is amplified by the amplifier 128 and then supplied to the speaker unit 104
as a drive signal. Thus, the speaker unit 104 is driven by the low frequency component.
[0066]
In the configuration of the drive system shown in FIG. 10, four magnetostrictive actuators 103
are driven by high-frequency components SAH1 to SAH4 independently processed by signal
processing units 129-1 to 129-4, respectively. It can enhance the sense of spread. In FIG. 10, the
high frequency components SAH1 to SAH4 for driving the four magnetostrictive actuators 103
are shown to be obtained from the monaural sound signal SA, but the left sound signal AL and
the right sound signal AR constituting the stereo sound signal are shown. Alternatively, it may be
obtained from multi-channel audio signals.
12-05-2019
19
[0067]
FIG. 11 shows another configuration of drive systems of the four magnetostrictive actuators 103
and the speaker unit 104.
[0068]
The drive system 200 includes a DSP (Digital Signal Processor) block 201 and amplifier blocks
202 and 203.
The DSP block 201 includes a signal correction and sound field control unit 201A on the
magnetostrictive actuator side and a signal correction and sound field control unit 201B on the
speaker unit side.
[0069]
The signal correction and sound field control unit 201A on the magnetostrictive actuator side
includes four signal processing units 211 and four high pass filters (HPFs) 212 corresponding to
the four magnetostrictive actuators 103, respectively, and further includes four signals. The
signal processing unit 211 is provided with eight attenuators 210 for attenuating and inputting
the left audio signal AL and the right audio signal AR which constitute stereo audio signals.
[0070]
The respective signal processing units 211 respectively adjust the levels, delay times, frequency
characteristics, etc. of the input audio signals AL, AR, and further perform processing such as
mixing of the audio signals AL, AR (sound field control processing). At the same time, signal
correction processing regarding the output characteristic of the magnetostrictive actuator 103 is
performed.
Each high pass filter 212 extracts high frequency components from the audio signal from the
corresponding signal processing unit 211, and supplies the high frequency component to the
amplifier block 202.
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[0071]
In this case, in each magnetostrictive actuator 103, the high-frequency component of the audio
signal subjected to the sound field control processing and the signal correction processing
independently of each other by the signal correction of the DSP block 201 and the sound field
control unit 201A is It is amplified and supplied. By driving the four magnetostrictive actuators
103 with the high frequency components subjected to the sound field control processing in this
manner, it is possible to enhance the sense of sound expansion due to the high frequency sound
output.
[0072]
On the other hand, the signal correction and sound field control unit 201B on the speaker unit
side includes one signal processing unit 221 and one low pass filter (LPF) 222 corresponding to
the speaker unit 104, and further to the signal processing unit 221. There are provided two
attenuators 220 for attenuating and inputting the left audio signal AL and the right audio signal
AR constituting a stereo audio signal.
[0073]
The signal processing unit 221 adjusts the levels, delay times, frequency characteristics, and the
like of the input audio signals AL and AR, and further performs processing such as mixing of the
audio signals AL and AR (sound field control processing). Perform signal correction processing
on resonance tube characteristics.
The low pass filter 222 extracts low frequency components from the audio signal from the signal
processing unit 221, and supplies the low frequency component to the amplifier block 203.
[0074]
In this case, the low-frequency component of the audio signal subjected to the sound field control
processing and the signal correction processing by the signal correction of the DSP block 201
and the sound field control unit 201B is amplified and supplied to the speaker unit 104 by the
amplifier block 203. Ru. By driving the speaker unit 104 with the low frequency component in
which the sound field control processing has been performed as described above, it is possible to
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enhance the sense of sound spreading due to the low frequency sound output.
[0075]
In the drive system 200 of FIG. 17, the order of the signal processing unit 211 of the signal
correction and sound field control unit 201A and the high pass filter 212 may be reversed, and
similarly, the signal correction unit of the signal correction and sound field control unit 201B and
The order of the low pass filter 222 may be reversed.
[0076]
Next, another embodiment of the present invention will be described.
12 to 14 show the configuration of a speaker device 100B as an embodiment. 12 is a perspective
view of the speaker device 100B, FIG. 13 is a longitudinal sectional view taken along the line BB
in FIG. 11, and FIG. 14 is a top view of the speaker device 100B. In FIGS. 12 to 14, parts
corresponding to those in FIGS. 1 to 4 are denoted by the same reference numerals, and the
detailed description thereof will be omitted.
[0077]
In the speaker device 100A shown in FIGS. 1 to 4 described above, the pipe 102 which is a
cylindrical diaphragm is used as the acoustic diaphragm. However, in the speaker device 100B,
the flat diaphragm is used as the acoustic diaphragm. A certain rectangular acrylic plate 102B is
used.
[0078]
The acrylic plate 102B is vertically fixed to the base housing 101B via a rectangular
parallelepiped housing fixing plate 141.
In this case, the case fixing plate 141 is attached to the upper surface side of the base case 101B
by adhesion or the like. Then, on the upper surface side of the case fixing plate 141, as shown in
FIG. 13, a groove 142 having a rectangular cross-sectional shape extending in the longitudinal
direction is provided. The lower end portion of the acrylic plate 102B is attached to the housing
12-05-2019
22
fixing plate 141 by, for example, being press-fitted into the groove 142 or further bonded after
being press-fitted into the groove 142.
[0079]
A plurality of, in the present embodiment, two magnetostrictive actuators 103 are mounted on
the case fixing plate 141 so that the displacement direction of the drive rod 103a coincides with
the surface direction of the acrylic plate 102B (vertical direction in this embodiment). It is fixed.
In this case, the magnetostrictive actuator 103 is attached to the case fixing plate 141 by
screwing the fixing tool 143 having a shape along the outer shape of the magnetostrictive
actuator 103 to the side surface of the case fixing plate 141 with a screw 144 There is.
[0080]
A displacement output transmission member 145 is interposed between the drive rod 103 a of
the magnetostrictive actuator 103 and the acrylic plate 102 B. The displacement output
transmission member 145 connects the drive rod 103 a of the actuator 103 to an excitation
point P which is a predetermined point on the surface of the acrylic plate 102 B. In this case,
since the displacement output of the magnetostrictive actuator 103 is transmitted to the
excitation point P of the acrylic plate 102B via the displacement output transmission member
145, the acrylic plate 102B is excited at the excitation point corresponding to the displacement
output of the actuator 103. It becomes possible to excite in the surface direction from P.
[0081]
Here, the displacement output transmission member 145 is constituted by a screw 146 as shown
in FIG. 13 in this embodiment. The screw 146 connects the drive rod 103 a of the
magnetostrictive actuator 103 and the excitation point P of the acrylic plate 102 B. That is, the
drive rod 103a of the magnetostrictive actuator 103 and the acrylic plate 102B are screwed with
a screw 146 as a rod-like member so as to penetrate. In this case, a through hole for passing the
screw portion of the screw 146 is provided at a position corresponding to the excitation point P
of the acrylic plate 102B, and a screw hole in which an internal thread is cut is provided in the
drive rod 103a. ing.
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[0082]
The two magnetostrictive actuators 103 are driven with the same high frequency component
SAH by a drive system as shown in FIG. 8 described above, for example, and the respective drive
rods 103a are displaced in correspondence with the high frequency component SAH.
Alternatively, these two magnetostrictive actuators 103 are driven by the high frequency
components SAH1 and SAH2 independent of each other, for example, by the drive systems as
shown in FIG. 10 and FIG. 11 described above, and the respective drive rods 103a are It displaces
according to component SAH1 and SAH2.
[0083]
In the speaker device 100B, the acoustic diaphragm is a rectangular acrylic plate 102B which is a
flat diaphragm, and the acoustic diaphragm can not be used as a resonance tube. Therefore, the
upper surface side of the opening 105 of the base housing 101B is closed, and a closed space as
a back cavity is formed on the back surface side of the speaker unit 104 so that the bass sounds
well.
[0084]
The operation of the speaker device 100B shown in FIGS. 12 to 14 will be described.
[0085]
The two magnetostrictive actuators 103 fixed to the housing fixing plate 141 are driven by, for
example, the high frequency component SAH of the monaural sound signal SA, and the drive rods
103a thereof are displaced corresponding to the high frequency component SAH.
The displacement of the drive rod 103 a (displacement output of the actuator 103) is transmitted
to the excitation point P of the acrylic plate 102 B via the displacement output transmission
member 145. Therefore, the acrylic plate 102B is excited in the surface direction from the
excitation point P in response to the displacement output of the actuator 103.
[0086]
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In this case, the excitation point P of the acrylic plate 102B is excited by the longitudinal wave,
and an elastic wave (vibration) propagates in the surface direction through the acrylic plate
102B. Then, when the elastic wave propagates through the acrylic plate 102B, mode conversion
of longitudinal waves, transverse waves, longitudinal waves,... Is repeated, and the mixed waves
of longitudinal waves and transverse waves become mixed waves, and the inboard direction of
the acrylic plate 102B Vibrations in the direction perpendicular to the plane) are excited. As a
result, sound waves are emitted from one surface and the other surface of the acrylic plate 102B.
That is, a high frequency sound output corresponding to the high frequency component SAH is
obtained from the outer surface of the acrylic plate 102B.
[0087]
Further, the speaker unit 104 attached to the lower surface side of the base housing 101B is
driven by the low frequency component SAL of the monaural sound signal SA. Then, an audio
output (positive phase) in a low band is obtained from the front surface of the speaker unit 104,
and this audio output is radiated to the outside from the lower surface side of the base housing
101B.
[0088]
According to the speaker device 100B shown in FIGS. 12 to 14, the magnetostrictive actuator
103 driven by, for example, the high-frequency component SAH of the monaural audio signal SA
is the acrylic plate 102B as in the speaker device 100A shown in FIGS. From the excitation point
P in the surface direction. Therefore, a large transverse wave is not generated at the excitation
point P, and the sound wave from the excitation point P is not heard as a very loud sound as
compared to the sound waves emitted from other positions, and the acrylic plate 102B The
sound image can be localized over the entire surface, and a sound image with a sense of spread
can be obtained.
[0089]
Further, according to the speaker device 100B shown in FIGS. 12 to 14, the displacement output
of the magnetostrictive actuator 103 is transmitted to the excitation point P on the surface of the
acrylic plate 102B via the displacement output transmission member 145. The displacement
output of the magnetostrictive actuator 103 can be transmitted to the acrylic plate 102B more
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25
faithfully than, for example, one in which the drive rod 103a of the magnetostrictive actuator
103 simply contacts the end face of the acrylic plate 102B. Faithful voice output can be obtained.
[0090]
Further, according to the speaker device 100B shown in FIGS. 12 to 14, the displacement output
transfer member 145 penetrates the drive rod 103a of the magnetostrictive actuator 103 and
the acrylic plate 102B, and connects the drive rod 103a and the acrylic plate 102B. It is assumed
to have 146.
Therefore, even when the case fixing plate 141 exists on the lower end side of the acrylic plate
102B, the magnetostrictive actuator 103 can be disposed on one surface side of the acrylic plate
102B, and the displacement output of the magnetostrictive actuator 103 is made to the acrylic
plate 102B. It can be transmitted well.
[0091]
Next, another embodiment of the present invention will be described. FIG. 15 and FIG. 16 show
the configuration of the speaker device 100C as the embodiment. FIG. 15 is a perspective view of
the speaker device 100C, and FIG. 16 is a top view of the speaker device 100C. In FIGS. 15 and
16, parts corresponding to those in FIGS. 12 to 14 are given the same reference numerals, and
the detailed description thereof will be omitted.
[0092]
In the speaker device 100C, a magnetostrictive actuator 103C is used instead of the
magnetostrictive actuator 103. As described above, the magnetostrictive actuator 103 has the
drive rod 103a for obtaining a displacement output only at one end. On the other hand, as shown
in FIG. 17, the magnetostrictive actuator 103C has drive rods 103a1 and 103a2 displaced in line
symmetry on one end side and the other end side.
[0093]
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26
The predetermined number of magnetostrictive actuators 103C in this embodiment is such that
the displacement directions of the drive rods 103a1 and 103a2 coincide with the surface
direction of the acrylic plate 102B (vertical direction in this embodiment). It is fixed to In this
case, the magnetostrictive actuator 103C is attached to the acrylic plate 102B by screwing a
fixture 171 having a shape along the outer shape of the magnetostrictive actuator 103C to the
acrylic plate 102B with a screw 172.
[0094]
A displacement output transfer member 173-1 is interposed between the drive rod 103a1 of the
magnetostrictive actuator 103C and the acrylic plate 102B. The displacement output transfer
member 173-1 connects the drive rod 103a1 of the actuator 103C to the excitation point P1,
which is a first point on the surface of the acrylic plate 102B. In this case, since the displacement
output of the magnetostrictive actuator 103C is transmitted to the excitation point P1 of the
acrylic plate 102B via the displacement output transfer member 173-1, the acrylic plate 102B
corresponds to the displacement output of the magnetostrictive actuator 103C, It becomes
possible to excite in the surface direction from the excitation point P1.
[0095]
Here, as shown in FIG. 17, the displacement output transfer member 173-1 is constituted by a
screw 174-1 in this embodiment. The screw 174-1 connects the drive rod 103a1 of the
magnetostrictive actuator 103C and the excitation point P1 of the acrylic plate 102B. That is, the
drive rod 103a1 of the magnetostrictive actuator 103C and the acrylic plate 102B are penetrated
by screwing with the screw 174-1 as a rod-like member. In this case, a through hole for passing
the screw portion of the screw 174-1 is provided at a position corresponding to the excitation
point P1 of the acrylic plate 102B, and a screw hole in which an internal thread is cut is provided
in the drive rod 103a1. It is provided.
[0096]
Further, a displacement output transfer member 173-2 is interposed between the drive rod
103a2 of the magnetostrictive actuator 103C and the acrylic plate 102B. The displacement
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output transfer member 173-2 connects the drive rod 103a2 of the actuator 103C to the
excitation point P2, which is a second point on the surface of the acrylic plate 102B. In this case,
since the displacement output of the magnetostrictive actuator 103C is transmitted to the
excitation point P2 of the acrylic plate 102B via the displacement output transfer member 173-2,
the acrylic plate 102B corresponds to the displacement output of the magnetostrictive actuator
103C, It becomes possible to excite in the surface direction from the excitation point P2.
[0097]
Here, the displacement output transfer member 173-2 is configured by a screw 174-2 as shown
in FIG. 17 in this embodiment. The screw 174-2 connects the drive rod 103a2 of the
magnetostrictive actuator 103C and the excitation point P2 of the acrylic plate 102B. That is, the
drive rod 103a2 of the magnetostrictive actuator 103C and the acrylic plate 102B are penetrated
by screwing with a screw 174-2 as a rod-like member. In this case, a through hole for passing the
screw portion of the screw 174-2 is provided at a position corresponding to the excitation point
P2 of the acrylic plate 102B, and a screw hole in which an internal thread is cut is provided in
the drive rod 103a2. It is provided.
[0098]
The magnetostrictive actuator 103C is driven by the high frequency component SAH of the audio
signal by a drive system as shown in FIG. 8 described above, for example, and the drive rods
103a1 and 103a2 are displaced in line symmetry with each other corresponding to the high
frequency component SAH. Do. For example, when the drive rod 103a1 is displaced upward, the
drive rod 103a2 is displaced downward, and conversely, when the drive rod 103a1 is displaced
downward, the drive rod 103a2 is displaced upward.
[0099]
The other components of the speaker device 100C are configured in the same manner as the
speaker device 100B shown in FIGS.
[0100]
The operation of the speaker device 100C shown in FIGS. 15 and 16 will be described.
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28
[0101]
The magnetostrictive actuator 103C fixed to the acrylic plate 102B is driven by, for example, the
high frequency component SAH of the monaural sound signal SA, and the drive rods 103a1 and
103a2 are displaced in line symmetry with each other corresponding to the high frequency
component SAH.
The displacement of the drive rods 103a1 and 103a2 (displacement output of the actuator
103C) is transmitted to the excitation points P1 and P2 of the acrylic plate 102B via the
displacement output transmission members 173-1 and 173-2.
Therefore, the acrylic plate 102B is excited in the surface direction from the excitation points P1
and P2 in accordance with the displacement output of the actuator 103C.
[0102]
In this case, the excitation points P1 and P2 of the acrylic plate 102B are excited by longitudinal
waves, and an elastic wave (vibration) propagates in the surface direction through the acrylic
plate 102B. Then, when the elastic wave propagates through the acrylic plate 102B, mode
conversion of longitudinal waves, transverse waves, longitudinal waves,... Is repeated, and the
mixed waves of longitudinal waves and transverse waves become mixed waves, and the inboard
direction of the acrylic plate 102B Vibrations in the direction perpendicular to the plane are
excited. As a result, sound waves are emitted from one surface and the other surface of the
acrylic plate 102B. That is, a high frequency sound output corresponding to the high frequency
component SAH is obtained from the outer surface of the acrylic plate 102B. In addition, the
operation | movement which concerns on the speaker unit 104 is the same as that of the speaker
apparatus 101B shown to FIGS. 12-14.
[0103]
According to the speaker device 100C shown in FIGS. 15 and 16, the magnetostrictive actuator
103C driven by, for example, the high-frequency component SAH of the monaural audio signal
SA is the acrylic plate 102B as in the speaker device 100A shown in FIGS. From the excitation
points P1 and P2 in the surface direction. Therefore, large transverse waves are not generated at
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the excitation points P1 and P2, and the sound waves from the excitation points P1 and P2 are
not heard as a very loud sound as compared to the sound waves emitted from other positions.
The sound image can be localized over the entire surface of the acrylic plate 102B, and a sound
image with a sense of spread can be obtained.
[0104]
Further, according to the speaker device 100C shown in FIGS. 15 and 16, the displacement
output of the magnetostrictive actuator 103C is the excitation point P1 on the surface of the
acrylic plate 102B through the displacement output transfer members 173-1 and 173-2. And P2,
for example, the displacement output of the magnetostrictive actuator 103C is faithfully
transmitted to the acrylic plate 102B as compared with the case where the drive rods 103a1 and
103a2 of the magnetostrictive actuator 103C are simply abutted against the end face of the
acrylic plate 102B. It is possible to obtain an audio output faithful to the audio signal from the
acrylic plate 102B.
[0105]
Further, according to the speaker device 100C shown in FIGS. 15 and 16, the magnetostrictive
actuator 103C has the drive rods 103a1 and 103a2 displaced in line symmetry with each other,
and the displacement output obtained by the drive rods 103a1 and 103a2 is It is transmitted to
the excitation points P1 and P2 of the acrylic plate 102B via the displacement output transfer
members 173-1 and 173-2 and the excitation point for the acoustic diaphragm (acrylic plate
102B) by one magnetostrictive actuator is Since there are two points, it is possible to further
enhance the sense of the sound image's spread.
[0106]
Next, another embodiment of the present invention will be described.
FIG. 18 shows the configuration of a speaker device 100D as an embodiment.
FIG. 18 shows a perspective view of the speaker device 100D.
[0107]
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In the speaker device 100D, a magnetostrictive actuator 103C is attached to one surface of a
box-shaped acoustic diaphragm 102D. The attachment of the magnetostrictive actuator 103C to
the acoustic diaphragm 102D is performed in the same manner as the attachment of the
magnetostrictive actuator 103C to the acrylic plate 102B in the speaker device 100C shown in
FIGS. 15 and 16 described above.
[0108]
Further, as in the connection between the drive rods 103a1 and 103a2 of the magnetostrictive
actuator 103C and the acrylic plate 102B in the speaker device 100C shown in FIGS. 15 and 16
described above, the drive rods 103a1 and 103a2 of the magnetostrictive actuator 103C
respectively output displacement The transmission members 173-1 and 173-2 are connected to
mutually different excitation points P1 and P2 of the acoustic diaphragm 102D.
[0109]
The operation of the speaker device 100D shown in FIG. 18 will be described.
[0110]
The magnetostrictive actuator 103C fixed to the acoustic diaphragm 102D is driven by, for
example, a monaural sound signal, and the drive rods 103a1 and 103a2 are displaced in line
symmetry with each other corresponding to the sound signal.
The displacement of the drive rods 103a1 and 103a2 (displacement output of the actuator
103C) is transmitted to the excitation points P1 and P2 of the acoustic diaphragm 102D via the
displacement output transmission members 173-1 and 173-2.
Therefore, the acoustic diaphragm 102D is excited in the surface direction from the excitation
points P1 and P2 corresponding to the displacement output of the actuator 103C.
[0111]
In this case, the excitation points P1 and P2 of the acoustic diaphragm 102D are excited by
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longitudinal waves, and an elastic wave (vibration) propagates in the surface direction through
the acoustic diaphragm 102D. And when this elastic wave propagates on each surface of acoustic
diaphragm 102D, mode conversion of longitudinal wave, transverse wave, longitudinal wave ... is
repeated, and it becomes a mixed wave of longitudinal wave and transverse wave, acoustic
diaphragm 102D by the transverse wave. Vibration in the in-plane direction (direction
perpendicular to the surface) is excited. Thus, sound waves are emitted from each surface of the
box-shaped acoustic diaphragm 102D. That is, an audio output corresponding to the audio signal
is obtained from each surface of the acoustic diaphragm 102D.
[0112]
According to the speaker device 100D shown in FIG. 18, similarly to the speaker device 100A
shown in FIGS. 1 to 4, the magnetostrictive actuator 103C driven by an audio signal is a boxshaped acoustic diaphragm 102D at excitation points P1, P1. From P2, it excites in the surface
direction. Therefore, large transverse waves are not generated at the excitation points P1 and P2,
and the sound waves from the excitation points P1 and P2 are not heard as a very loud sound as
compared to the sound waves emitted from other positions. A sound image can be localized over
each surface of the box-shaped acoustic diaphragm 102D, and a sound image having a sense of
spread can be obtained.
[0113]
Further, according to the speaker device 100D shown in FIG. 18, the displacement output of the
magnetostrictive actuator 103C is an excitation point on the surface of the box-shaped acoustic
diaphragm 102D via the displacement output transfer members 173-1 and 173-2. The
displacement output of the magnetostrictive actuator 103C is compared to that transmitted to P1
and P2, for example, as compared with the one in which the drive rods 103a1 and 103a2 of the
magnetostrictive actuator 103C are simply brought into contact with the end face of the
rectangular or cylindrical acoustic diaphragm. It can be faithfully transmitted to the diaphragm
102D, and an audio output faithful to the audio signal can be obtained from the acoustic
diaphragm 102D.
[0114]
Further, according to the speaker device 100D shown in FIG. 18, the displacement output of the
magnetostrictive actuator 103C is an excitation point on the surface of the box-shaped acoustic
diaphragm 102D via the displacement output transfer members 173-1 and 173-2. The
displacement output of the magnetostrictive actuator 103C is favorably transmitted to the boxshaped acoustic diaphragm 102D having no end face and transmitted to P1 and P2, and can be
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oscillated in the surface direction.
[0115]
Further, according to the speaker device 100D shown in FIG. 18, the magnetostrictive actuator
103C has the drive rods 103a1 and 103a2 displaced in line symmetry with each other, and the
displacement output obtained by the drive rods 103a1 and 103a2 is the displacement output
transmission The acoustic image is transmitted to the excitation points P1 and P2 of the acrylic
plate 102B through the members 173-1 and 173-2, and there are two excitation points for the
acoustic diaphragm 102D by one magnetostrictive actuator. It can further enhance the sense of
spread.
[0116]
In the above-described speaker devices 100A to 100D, a speaker device using a cylindrical, flat,
or box-shaped acoustic diaphragm has been shown, but the present invention can be applied to
other shapes, for example, an acoustic diaphragm such as a spherical shape. The same applies to
those using.
In that case, when using the acoustic diaphragm of the shape without an end surface, the
displacement output transmission member as shown by the above-mentioned speaker apparatus
100B-100D may be used, for example.
[0117]
Further, in the above embodiment, although the actuator for vibrating the acoustic diaphragm is
a magnetostrictive actuator, other actuators such as an electrodynamic actuator and a
piezoelectric actuator may be used as the actuator. Can be obtained.
[0118]
According to the present invention, it is possible to obtain a sound image with a sense of
expansion, to obtain an audio output faithful to an audio signal, and further to increase the
freedom in selecting the shape of the acoustic diaphragm. The present invention can be applied
to a speaker device or the like in an audio visual device.
[0119]
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33
It is a perspective view which shows the structure of the speaker apparatus 100A as
embodiment.
It is a longitudinal cross-sectional view which shows the structure of the speaker apparatus 100A
as embodiment.
It is a top view which shows the structure of the speaker apparatus 100A as embodiment.
It is a bottom view which shows the structure of the speaker apparatus 100A as embodiment.
FIG. 2 is a schematic cross-sectional view of a magnetostrictive actuator. It is a magnetic flux line
figure of a magnetostrictive actuator. It is a figure which shows the connection structure of the
drive rod of a magnetostrictive actuator and a pipe by a displacement output transmission
member. It is a block diagram which shows the structure of the drive system of a
magnetostrictive actuator and a speaker unit. It is a figure which shows the correspondence of
the audio | voice signal input into a magnetostrictive actuator, and the amplitude response of the
pipe to which the displacement output of this magnetostrictive actuator is transmitted. It is a
block diagram which shows the other structure of the drive system of a magnetostrictive actuator
and a speaker unit. It is a block diagram which shows the other structure of the drive system of a
magnetostrictive actuator and a speaker unit. It is a perspective view which shows the structure
of the speaker apparatus 100B as embodiment. It is a longitudinal cross-sectional view which
shows the structure of the speaker apparatus 100B as embodiment. It is a top view which shows
the structure of the speaker apparatus 100B as embodiment. It is a perspective view showing the
composition of the speaker apparatus 100C as an embodiment. It is a top view which shows the
structure of the speaker apparatus 100C as embodiment. It is the figure which expanded and
showed the attachment part of the magnetostrictive actuator. It is a perspective view showing
composition of speaker device 100D as an embodiment. It is a block diagram which shows the
structural example of the audio | voice output apparatus using a magnetostrictive actuator.
Explanation of sign
[0120]
100A to 100D: speaker device, 101, 101B: base housing, 102: pipe, 102B: acrylic plate, 102D:
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box-shaped acoustic diaphragm, 103, 103C: magnetostriction Actuator, 103a, 103a1, 103a2 ...
Drive rod, 104 ... Speaker unit, 105 ... Opening, 106 ... Leg, 107 ... L-shaped angle made of metal
108, 112, 113 116: damping material 114: penetrating storage hole 118: leaf spring 134:
displacement output transmission member 134a: U-shaped member 134b: screw 141 и и и и и и и и
Fixed housing, fixing member и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииии3
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i Disc), a DVD (Digital
Versatile Disc) or the like, and outputs an audio signal. The audio signal output from the player
301 is amplified by the amplifier 302 and then supplied to the magnetostrictive actuator 303.
The magnetostrictive actuator 303 has a drive rod 303 a for transmitting a displacement output,
and the tip of the drive rod 303 a is in contact with the diaphragm 304.
[0005]
The magnetostrictive actuator 303 drives the diaphragm 304 based on the audio signal. That is,
the drive rod 303 a of the magnetostrictive actuator 303 is displaced corresponding to the sound
signal waveform, and the displacement is transmitted to the diaphragm 304. Thereby, from the
diaphragm 304, an audio output corresponding to the audio signal is obtained. UnexaminedJapanese-Patent No. 04-313999
[0006]
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2
In the speaker device 305 in the above-described audio output device 300, the drive rod 303 of
the magnetostrictive actuator 303 is brought into contact with the plate surface of the
diaphragm 304, and this diaphragm 304 is applied with a vibration component in a direction
orthogonal to the plate surface. By shaking, voice output is obtained.
[0007]
In this case, since the diaphragm 304 is greatly excited at the excitation point, the sound wave
from the excitation point can be heard as a much louder sound than other positions from the
viewpoint of the viewer.
As a result, the sound image was localized at the excitation point, and it was not possible to
obtain a sound image having a sense of spread.
[0008]
An object of the present invention is to provide a speaker device capable of obtaining a sound
image with a sense of expansion, obtaining an audio output faithful to an audio signal, and
further increasing the freedom in selecting the shape of an acoustic diaphragm. To provide.
[0009]
The concept of the present invention includes: an acoustic diaphragm; an actuator having a
displacement output unit driven based on an audio signal and capable of obtaining a
displacement corresponding to the audio signal; and a displacement output unit of the actuator
on the surface of the acoustic diaphragm. A displacement output transmission member
connected to the predetermined point on the upper surface, the displacement output of the
actuator is transmitted to the predetermined point on the surface of the acoustic diaphragm via
the displacement output transmission member, and the displacement output of the actuator is
detected. Correspondingly, the above-mentioned acoustic diaphragm is excited in the surface
direction from the above-mentioned predetermined point.
[0010]
The speaker device of the present invention includes an acoustic diaphragm, an actuator, and a
displacement output transmission member.
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3
The actuator is driven based on the audio signal.
The displacement output of the actuator is transmitted to a predetermined point on the surface
of the acoustic diaphragm via the displacement output transmission member. Then, the acoustic
diaphragm is oscillated in the surface direction from a predetermined point on the surface,
corresponding to the displacement output of the actuator. Here, the surface direction of the
acoustic diaphragm means a direction parallel to the surface. As the actuator, for example, a
magnetostrictive actuator, an electrodynamic actuator, a piezoelectric actuator or the like is used.
[0011]
By vibrating the acoustic diaphragm in the surface direction, an elastic wave based on the audio
signal propagates in the surface direction through the acoustic diaphragm. Then, when the elastic
wave propagates through the acoustic diaphragm, mode conversion of longitudinal waves,
transverse waves, longitudinal waves,... Is repeated to become a mixed wave of longitudinal
waves and transverse waves, and the transverse waves make the in-plane direction of the
acoustic diaphragm by the transverse waves. Vibrations (in the direction perpendicular to the
plane) are excited. Thereby, a sound wave is radiated to the outside from the surface of the
acoustic diaphragm, and an audio output is obtained.
[0012]
The acoustic diaphragm is excited in the surface direction, and no large transverse wave is
generated at the excitation point, and the sound wave emitted from this excitation point is much
larger than the sound wave emitted from other positions. The sound image is localized over the
entire acoustic diaphragm without being heard as a sound, and it is possible to obtain a sound
image with a sense of spread.
[0013]
Also, the displacement output of the actuator is transmitted to a predetermined point on the
surface of the acoustic diaphragm via the displacement output transmission member, and for
example, the one in which the displacement output portion of the actuator is simply in contact
with the end surface of the acoustic diaphragm In comparison, the displacement output of the
actuator can be transmitted faithfully to the acoustic diaphragm, and an audio output faithful to
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the audio signal can be obtained, and the shape of the acoustic diaphragm is, for example,
spherical or box-shaped without an end face The degree of freedom in selecting the shape of the
acoustic diaphragm can be increased.
[0014]
For example, the displacement output transmission member includes a U-shaped member
connected to the displacement output portion of the actuator, and an end portion of the acoustic
diaphragm inserted in the U-shaped member, the U-shaped member and the acoustic vibration It
has a rod-like member which penetrates the plate and connects the U-shaped member and the
acoustic diaphragm.
In this case, the displacement output of the actuator can be transmitted from both sides of the
acoustic diaphragm to the predetermined point (excitation point) of the acoustic diaphragm by
the U-shaped member, and stable transmission of the displacement output of the actuator
becomes possible.
[0015]
Also, for example, the displacement output transmission member has a rod-like member which
penetrates the displacement output portion of the actuator and the acoustic diaphragm and
connects the displacement output portion and the acoustic diaphragm.
In this case, the actuator can be disposed on one side of the acoustic diaphragm, and even an
acoustic diaphragm having a spherical shape, a box shape, or the like having no end portion can
be applied.
[0016]
For example, the speaker device further includes a biasing structure that constantly biases the
actuator in the surface direction. In this case, when the contact portion of the acoustic diaphragm
with the displacement output transmission member is scraped for a long period of use, and the
rattle occurs in the contact portion, the displacement output transmission member can be
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5
pressed against the acoustic diaphragm, so that the acoustic vibration is generated. It becomes
possible to excite the plate well in the plane direction.
[0017]
For example, the actuator has a first displacement output section at one end and a second
displacement output section at the other end. The first and second displacement output units are
connected to the first and second points of the acoustic diaphragm via the first and second
displacement output transmitting members. In this case, since two excitation points are provided
to the acoustic diaphragm by one actuator, it is possible to enhance the sense of the spread of the
sound image.
[0018]
For example, a plurality of actuators are provided. The displacement outputs of the plurality of
actuators are transmitted to different points on the surface of the acoustic diaphragm by the
plurality of displacement output transmitting members. For example, non-directionality can be
obtained by driving a plurality of actuators based on the same audio signal. Also, for example, a
plurality of actuators obtained by independently adjusting the levels, delay times, frequency
characteristics, etc. of independent audio signals, for example, audio signals of a plurality of
channels, or the same audio signal. By driving based on the audio signal or the like, it is possible
to perform sound field processing that enhances the sense of sound spread.
[0019]
According to the present invention, the displacement output of the actuator is transmitted to a
predetermined point on the surface of the acoustic diaphragm via the displacement output
transmission member, and the acoustic diaphragm is surfaced from the above-mentioned
predetermined point corresponding to the displacement output of the actuator. It is possible to
obtain a sound image with a sense of expansion, obtain a sound image with a sense of expansion,
obtain an audio output faithful to an audio signal, and further increase the freedom in selecting
the shape of the acoustic diaphragm. it can.
[0020]
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6
An embodiment of the present invention will be described.
1 to 4 show the configuration of a speaker device 100A as an embodiment. 1 is a perspective
view of the speaker device 100A, FIG. 2 is a longitudinal sectional view of the speaker device
100A, FIG. 3 is a top view of the speaker device 100A, and FIG. 4 is a bottom view of the speaker
device 100A.
[0021]
The speaker device 100A includes a base housing 101, a pipe 102, a magnetostrictive actuator
103 as an actuator, a displacement output transmission member 134, and a speaker unit 105
using an electrodynamic actuator as a sound generator. ing. The pipe 102 constitutes a
cylindrical diaphragm as an acoustic diaphragm. The drive rod 103 a of the magnetostrictive
actuator 103 constitutes a displacement output unit to obtain a displacement output
corresponding to the audio signal for driving the magnetostrictive actuator 103.
[0022]
The base housing 101 is formed of, for example, a synthetic resin. The base housing 101 is
formed in a disk shape as a whole, but an opening 105 penetrating in a cylindrical shape is
provided at the center portion thereof. Along the outer periphery of the lower surface of the base
housing 101, a predetermined number of, in this embodiment, three leg portions 106 are planted
at equal angular intervals.
[0023]
When the number of the legs 106 is three, since the three legs 106 are always in contact with
the installation surface, stable installation is possible as compared with, for example, the case
where four legs are provided. Further, by providing the leg portion 106 on the lower surface of
the base housing 101, the lower surface of the base housing 101 can be separated from the
installation surface, and the sound wave from the speaker unit 104 attached to the lower surface
side of the base housing 101. Makes it possible to radiate outside.
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[0024]
The pipe 102 is formed of a predetermined material, such as transparent acrylic. The pipe 102 is
fixed to the base housing 101. That is, the lower end portion of the pipe 102 is fixed to the upper
surface of the base casing 101 using a metal L-shaped angle 107 at a plurality of places, four
places in this embodiment. The size of the pipe 102 is, for example, 1000 mm in length, 100 mm
in diameter, and 2 mm in thickness.
[0025]
In this case, although not shown, round holes for screwing are formed at one end and the other
end of the L-shaped angle 107. One end of the L-shaped angle 107 is screwed to the upper
surface of the base housing 101 using a screw 109. The base housing 101 is formed with a
screw hole (not shown) to be screwed with the screw portion of the screw 109. In this case,
between one end of the L-shaped angle 107 and the upper surface of the base housing 101, a
damping material 108 composed of a ring-shaped rubber material or the like is interposed.
[0026]
The other end of the L-shaped angle 107 is screwed to the lower end of the pipe 102 using a
screw 110 and a nut 111. At the lower end portion of the pipe 102, a circular hole (not shown)
for passing the screw portion of the screw 110 is formed. Between the other end of the L-shaped
angle 107 and the outer surface of the pipe 102 and between the nut 111 and the inner surface
of the pipe 102, damping members 112 and 113 composed of a ring-shaped rubber material or
the like are respectively interposed. Be done.
[0027]
Thus, by interposing the damping members 108, 112, 113, it is possible to prevent the vibration
(elastic wave) by the magnetostrictive actuator 103 from propagating to the base casing 101
through the pipe 102 and the L-shaped angle 107, and the base casing Sound image localization
to the 101 side is prevented.
[0028]
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A plurality of, in the present embodiment, four magnetostrictive actuators 103 are disposed in
the base casing 101.
The four magnetostrictive actuators 103 are arranged at equal intervals along the circular end
face on the lower end side of the pipe 102. The base housing 101 is provided with a through
storage hole 114. The magnetostrictive actuator 103 is housed in the housing hole 114. As
described above, the drive rod 103a of the magnetostrictive actuator 103 can obtain a
displacement output corresponding to the audio signal. The magnetostrictive actuator 103 is
disposed such that the displacement direction of the drive rod 103 is the surface direction of the
pipe 102 (the direction parallel to the surface of the pipe 102).
[0029]
FIG. 5 shows a configuration example of the magnetostrictive actuator 103. As shown in FIG. The
magnetostrictive actuator 103 is a bar-like magnetostrictive element 151 which is displaced in
the extension direction, a solenoid coil 152 as a magnetic field generating portion disposed
around the magnetostrictive element 151 to apply a control magnetic field to the
magnetostrictive element 151, and magnetostrictive. The drive rod 103a is a movable member
connected to one end of the element 151 to obtain a displacement output of the magnetostrictive
actuator 103, and a housing portion 154 for housing the magnetostrictive element 151 and the
solenoid coil 152.
[0030]
The storage unit 154 is configured of a fixed plate 161, a permanent magnet 162, and a
cylindrical case 163. The other end of the magnetostrictive element 151 is connected to the fixed
board 161, and the magnetostrictive element 151 is supported by the fixed board 161. A
permanent magnet 162 for applying a static bias magnetic field to the magnetostrictive element
151 and a cylindrical case 163 as a magnetic circuit component are disposed around the
magnetostrictive element 151 to be accommodated. The cylindrical case 163 is attached to the
drive rod 103 a side of the permanent magnet 162 and the fixed disc 161 side, and by using a
ferromagnetic material, a static bias magnetic field can be efficiently applied to the
magnetostrictive element 151. In addition, the static bias magnetic field can be applied to the
magnetostrictive element 151 more efficiently by forming the fixed board 161 also using a
ferromagnetic material.
12-05-2019
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[0031]
A gap 155 is provided between the drive rod 103 a and the housing portion 154, and the drive
rod 103 a is formed using a ferromagnetic material so as to be attracted by the permanent
magnet 162. As a result, a magnetic attraction force is generated between the drive rod 103a and
the housing portion 154, and a preload is applied to the magnetostrictive element 151 attached
to the drive rod 103a by the magnetic attraction force.
[0032]
FIG. 6 shows a magnetic flux diagram of the magnetostrictive actuator 103 shown in FIG. The
magnetic flux lines generated from the permanent magnet 162 pass through the cylindrical case
163, and then travel toward the permanent magnet 162 through the gap 155, the drive rod
103a, and the fixed plate 161. For this reason, a magnetic attraction force is generated between
the drive rod 103 a and the housing portion 154, and a preload is applied to the
magnetostrictive element 151 by the magnetic attraction force. In addition, part of the magnetic
flux lines pass through the cylindrical case 163 and then travel toward the permanent magnet
162 through the gap 155, the drive rod 103a, the magnetostrictive element 151, and the fixed
plate 161. Therefore, a static bias magnetic field can be applied to the magnetostrictive element
151.
[0033]
In the magnetostrictive actuator 103 shown in FIG. 5, since the drive rod 103a is not supported
by the bearing, there is no problem of friction between the drive rod 103a and the bearing, and
therefore the loss of displacement output can be significantly reduced.
[0034]
Further, in the magnetostrictive actuator 103, since the preload is applied to the magnetostrictive
element 151 by the magnetic attraction force, the preload can be stably continued even if the
period of the displacement of the magnetostrictive element 151 is short, The displacement
output according to the control current supplied to the solenoid coil 152 can be obtained
correctly.
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[0035]
Therefore, in the magnetostrictive actuator 103, since the relationship between the control
current flowing through the solenoid coil 152 and the displacement of the drive rod 103a
approaches a linear relationship, distortion generated by the characteristics of the
magnetostrictive actuator 103 is reduced, and thus feedback correction Reduce the burden of
[0036]
Further, in this magnetostrictive actuator 103, since the permanent magnet 162 is interposed
between the two cylindrical cases 163, the static bias magnetic field applied to the
magnetostrictive element 151 is fixed to the position of the fixed board 161. It can be made
uniform compared with the case of providing.
Furthermore, there is no need to provide a bearing for supporting the drive rod 103a, a
connecting member for connecting the drive rod 103a and the storage portion 154, a spring for
applying a preload to the magnetostrictive element 151, etc., and miniaturization is easy. Can be
configured inexpensively.
[0037]
Referring back to FIGS. 1 to 4, the displacement output transmission member 134 is interposed
between the drive rod 103 a of the magnetostrictive actuator 103 and the pipe 102.
The displacement output transmission member 134 connects the drive rod 103 a of the
magnetostrictive actuator 103 to an excitation point which is a predetermined point on the pipe
surface of the pipe 102.
In this case, since the displacement output of the magnetostrictive actuator 103 is transmitted to
the excitation point of the pipe 102 through the displacement output transmission member 134,
the pipe 102 is moved from the excitation point to the surface corresponding to the displacement
output of the magnetostrictive actuator 103. It becomes possible to excite in the direction.
[0038]
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11
FIG. 7 shows a connection structure of the drive rod 103 a of the magnetostrictive actuator 103
and the pipe 102 by the displacement output transmission member 134. The displacement
output transmission member 134 has a U-shaped member 134 a and a screw 134 b as a rod-like
member. The U-shaped member 134 a is connected to the drive rod 103 a of the actuator 102. In
this case, the closed end side of the U-shaped member 134a is connected to the tip of the drive
rod 103a by a method such as adhesion or screwing. In the case of screwing, for example, a
screw hole in which a female screw is cut on the closed end side of the U-shaped member 134a is
provided, and a male screw corresponding to the female screw in the screw hole is provided at
the tip of the drive rod 103a. It is cut.
[0039]
The connection between the U-shaped member 134a and the excitation point P of the pipe 102
is made using a screw 134b. That is, the end of the pipe surface of the pipe 102 is inserted into
the U-shaped member 134a, and screwed with a screw 134b so as to penetrate the pipe surfaces
of the U-shaped member 134a and the pipe 102. In this case, the U-shaped member 134a is
provided with an internally threaded screw hole into which the male screw of the screw 134b is
screwed, and the screw 134b is provided at a position corresponding to the excitation point P on
the pipe surface of the pipe 102. There is a through hole for letting through.
[0040]
As described above, the magnetostrictive actuator 103 is housed in the penetrating housing hole
114 provided in the base housing 101. The back surface side opposite to the side where the
drive rod 103 a of the magnetostrictive actuator 103 is present is slightly protruded to the lower
surface side of the base housing 101, and screwed with a screw 117 to the lower surface side of
the base housing 101. It is in a state of being pressed by the leaf spring 118.
[0041]
As described above, when the back surface side of the magnetostrictive actuator 103 is pressed
by the plate spring 118, the magnetostrictive actuator 103 is always urged in the surface
direction of the pipe 102. In this case, the contact portion of the pipe 102 with the screw 134 b
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12
constituting the displacement output transmission member 134 is scraped in long-term use, and
when the rattle occurs in the contact portion, the screw 134 b can be pressed against the pipe
102 The pipe 102 can be vibrated in the surface direction.
[0042]
A leaf spring 118 attached to the lower surface of the base housing 101 constitutes a biasing
structure that always biases the magnetostrictive actuator 103 in the surface direction of the
pipe 102. The biasing structure is not limited to the above-described structure using the plate
spring 118, and may be any structure that always biases the magnetostrictive actuator 103 in
the surface direction of the pipe 102. For example, a storage hole having a bottom surface
instead of the through storage hole 114 may be used, and a structure in which a compression
coil spring is disposed between the bottom surface of the storage hole and the back side of the
magnetostrictive actuator 103 stored in the storage hole may be considered. .
[0043]
The pipe 102 and the magnetostrictive actuator 103 described above constitute a speaker that is
responsible for the high frequency side of the audio frequency band, and functions as a tweeter.
On the other hand, the speaker unit 104 constitutes a speaker in charge of the low frequency
side of the audio frequency band and functions as a woofer.
[0044]
The speaker unit 104 is attached at a position corresponding to the opening 105 on the lower
surface side of the base housing 101, for example, using a screw (not shown) with the front
surface facing downward. In this case, the direction of the central axis of the speaker unit 104
coincides with the axial direction of the pipe 102. The sound wave of positive phase output from
the front surface of the speaker unit 104 is radiated to the outside from the lower surface side of
the base housing 101. Also, sound waves of reverse phase outputted from the back surface of the
speaker unit 104 are radiated from the upper end side of the pipe 102 to the outside through the
opening 105 and the pipe 102. In this case, the pipe 102 functions as a resonance tube, enabling
a low-pass reproduction with a sense of volume.
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[0045]
A damping material 116 made of, for example, a rubber material is disposed between the end
face of the lower end portion of the pipe 102 and the base housing 101. The damping member
116 can increase the degree of sealing so that the pipe 102 functions well as a resonance pipe
while preventing the vibration of the magnetostrictive actuator 103 from propagating to the base
housing 101 through the pipe 102.
[0046]
FIG. 8 shows the configuration of the drive system of the four magnetostrictive actuators 103
and the speaker unit 104.
[0047]
The left audio signal AL and the right audio signal AR constituting the stereo audio signal are
supplied to the adder 121, where the audio signals AL and AR are combined to generate a
monaural audio signal SA.
A high pass component SAH is extracted from the monaural sound signal SA by the high pass
filter 122. The high frequency component SAH is corrected in frequency characteristics
corresponding to the magnetostrictive actuator 103 by the equalizer 123, and further amplified
by the amplifiers 124-1 to 124-4, and then supplied to the four magnetostrictive actuators 103
as drive signals. Be done. As a result, the four magnetostrictive actuators 103 are driven by the
same high frequency component SAH, and the respective drive rods 103a are displaced
corresponding to the high frequency component SAH.
[0048]
Further, the low pass component SAL is extracted by the low pass filter 125 from the monaural
sound signal SA generated by the adder 121. The low frequency component SAL is subjected to
correction of the frequency characteristic corresponding to the resonance tube comprising the
pipe 102 by the equalizer 126, delayed by the delay circuit 127 having a delay time of several
milliseconds, and further amplified by the amplifier 128. , And is supplied to the speaker unit
104 as a drive signal. Thus, the speaker unit 104 is driven by the low frequency component SAL.
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[0049]
By inserting the delay circuit 127 into the supply path of the low frequency component SAL to
the speaker unit 104, the time point when the low frequency sound wave is emitted from the
speaker unit 104 from the time when the high frequency sound wave is emitted from the pipe
102 is Become slow. Therefore, from the human auditory feature that the sound image is drawn
in the high region, the viewer can easily feel the sound image in the portion of the pipe 102
where the sound wave in the high region is emitted.
[0050]
The operation of the speaker device 100A shown in FIGS. 1 to 4 will be described.
[0051]
The four magnetostrictive actuators 103 housed and fixed in the base housing 101 are driven by
the high frequency component SAH of the monaural sound signal SA, and their drive rods 103a
are displaced corresponding to the high frequency component SAH.
The displacement of the drive rod 103 a (displacement output of the actuator 103) is transmitted
to the excitation point P (see FIG. 7) on the surface of the pipe 102 via the displacement output
transmission member 134. Therefore, the pipe 102 is excited in the surface direction from the
excitation point P in response to the displacement output of the actuator 103.
[0052]
In this case, the excitation point P of the pipe 102 is excited by a longitudinal wave, and an
elastic wave (vibration) propagates in the surface direction through the pipe 102. Then, when the
elastic wave propagates through the pipe 102, the mode conversion of longitudinal waves,
transverse waves, longitudinal waves,... Is repeated to become a mixed wave of longitudinal
waves and transverse waves, and the transverse waves of the pipe 102 in the in-plane direction
(surface Vibration in the vertical direction) is excited. Thereby, sound waves are emitted from the
pipe 102. That is, from the outer surface of the pipe 102, a high frequency sound output
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corresponding to the high frequency component SAH is obtained.
[0053]
In this case, since the four magnetostrictive actuators 103 arranged at equal intervals along the
circular end face on the lower end side of the pipe 102 are driven by the same high-frequency
component SAH, the entire circumference of the pipe 102 Non-directional, high-frequency audio
output can be obtained.
[0054]
In addition, the speaker unit 104 attached to the lower surface side of the base housing 101 is
driven by the low frequency component SAL of the monaural sound signal SA.
A low frequency audio output (normal phase) is obtained from the front surface of the speaker
unit 104, and this audio output is radiated from the lower surface side of the base housing 101
to the outside. Also, a low frequency audio output (reverse phase) is obtained from the back of
the speaker unit 104, and this audio output is radiated from the upper end side of the pipe 102
to the outside through the opening 105 and the pipe 102.
[0055]
According to the speaker device 100A shown in FIGS. 1 to 4, the magnetostrictive actuator 103
driven by the high frequency component SAH of the monaural audio signal SA excites the pipe
102 in the surface direction from the excitation point P It is. Therefore, a large transverse wave is
not generated at the excitation point P, and the sound wave from the excitation point P is not
heard as a very loud sound as compared to the sound waves emitted from other positions. A
sound image can be localized over the entire longitudinal direction, and a sound image with a
sense of spread can be obtained.
[0056]
Further, according to the speaker device 100A shown in FIGS. 1 to 4, the displacement output of
the magnetostrictive actuator 103 is transmitted to the excitation point P on the pipe surface of
the pipe 102 via the displacement output transmission member 134. The displacement output of
the magnetostrictive actuator 103 can be transmitted to the pipe 102 more faithfully than, for
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example, the drive rod 103a of the magnetostrictive actuator 103 is simply brought into contact
with the end face of the pipe 102. You can get the output.
[0057]
For example, the case where an audio signal as shown in FIG. 9A is input to the magnetostrictive
actuator 103 will be considered.
In this case, as in the speaker device 100A shown in FIGS. 1 to 4, the displacement output of the
magnetostrictive actuator 103 is transmitted to the excitation point P on the pipe surface of the
pipe 102 through the displacement output transmission member 134. In this case, the exciting
motion of the pipe 102 follows the displacement motion of the drive rod 103a in both the
upward and downward directions well. Therefore, the amplitude response in the surface direction
of the pipe 102 is as shown in FIG. 9C, and it is possible to obtain an audio output faithful to the
audio signal from the pipe 102.
[0058]
On the other hand, when the drive rod 103a of the magnetostrictive actuator 103 is simply
brought into contact with the end face of the pipe 102, the excitation operation of the pipe 102
favorably follows the upward displacement of the drive rod 103a. The excitation operation of the
pipe 102 does not follow the downward displacement operation of 103a. Therefore, the
amplitude response in the surface direction of the pipe 102 is as shown in FIG. 9B, and it
becomes difficult to obtain an audio output faithful to the audio signal from the pipe 102.
[0059]
Further, according to the speaker device 100A shown in FIGS. 1 to 4, the displacement output
transfer member 134 is a U-shaped member 134a connected to the drive rod 103a of the
magnetostrictive actuator 103, and the inside of the U-shaped member 134a. When the end of
the pipe surface of the pipe 102 is inserted, the U-shaped member 134a and the pipe surface of
the pipe 102 are penetrated, and the screw 134b for connecting the U-shaped member 134a and
the pipe 102 is provided. Accordingly, the displacement output of the magnetostrictive actuator
103 can be transmitted from both sides of the pipe surface of the pipe 102 to the excitation
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point P on the pipe surface of the pipe 102 by the U-shaped member 134a, and the displacement
output of the magnetostrictive actuator 103 It can be stably transmitted to the excitation point P
on the tube surface.
[0060]
According to the speaker device 100A shown in FIGS. 1 to 4, the displacement output member
134 is configured using the U-shaped member 134a, but in the vertical direction with respect to
the pipe 102 with the excitation point P as a fulcrum The shape does not have to be U-shaped as
long as good vibration can be given. For example, the displacement output member 134 can also
be configured using an L-shaped member or the like in which one side of the U-shaped member
134a is not provided.
[0061]
Further, according to the speaker device 100A shown in FIGS. 1 to 4, the displacement output
member 134 is configured by the U-shaped member 134a and the screw 134b, and the U-shaped
member 134a is connected to the pipe (diaphragm) 102 by the screw 134b. The pipe 102 can be
easily attached and detached.
[0062]
In the above, the drive system of the magnetostrictive actuator 103 and the speaker unit 104 is
configured as shown in FIG. 8, and the four magnetostrictive actuators 103 are driven by the
same high frequency component SAH.
However, these four magnetostrictive actuators 103 can be driven by independent high
frequency components SAH.
[0063]
FIG. 10 shows another configuration of drive systems of the four magnetostrictive actuators 103
and the speaker unit 104. In FIG. 10, parts corresponding to FIG. 8 are given the same reference
numerals, and the detailed description thereof will be omitted.
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[0064]
The high frequency components SAH extracted by the high pass filter 122 are supplied to four
signal processing units 129-1 to 129-4. The signal processing units 129-1 to 129-4
independently perform processing (sound field control processing) for adjusting the level, delay
time, frequency characteristics and the like on the high frequency component SAH, and the
magnetostrictive actuator Signal correction processing relating to the output characteristic of
103 is performed. The high frequency components SAH1 to SAH4 output from the signal
processing units 129-1 to 129-4 are respectively amplified by the amplifiers 124-1 to 124-4 and
then supplied to the four magnetostrictive actuators 103 as drive signals. Ru. As a result, the four
magnetostrictive actuators 103 are driven by independent high frequency components SAH1 to
SAH4, and the drive rods 103a are displaced corresponding to the high frequency components
SAH1 to SAH4.
[0065]
In addition, the low frequency component SAL extracted by the low pass filter 125 is supplied to
the signal processing unit 130. In the signal processing unit 130, processing (sound field control
processing) for adjusting the level, delay time, frequency characteristics and the like is performed
on the low frequency component SAL, and signal correction processing relating to resonance
tube characteristics is performed. The low frequency component output from the signal
processing unit 130 is amplified by the amplifier 128 and then supplied to the speaker unit 104
as a drive signal. Thus, the speaker unit 104 is driven by the low frequency component.
[0066]
In the configuration of the drive system shown in FIG. 10, four magnetostrictive actuators 103
are driven by high-frequency components SAH1 to SAH4 independently processed by signal
processing units 129-1 to 129-4, respectively. It can enhance the sense of spread. In FIG. 10, the
high frequency components SAH1 to SAH4 for driving the four magnetostrictive actuators 103
are shown to be obtained from the monaural sound signal SA, but the left sound signal AL and
the right sound signal AR constituting the stereo sound signal are shown. Alternatively, it may be
obtained from multi-channel audio signals.
12-05-2019
19
[0067]
FIG. 11 shows another configuration of drive systems of the four magnetostrictive actuators 103
and the speaker unit 104.
[0068]
The drive system 200 includes a DSP (Digital Signal Processor) block 201 and amplifier blocks
202 and 203.
The DSP block 201 includes a signal correction and sound field control unit 201A on the
magnetostrictive actuator side and a signal correction and sound field control unit 201B on the
speaker unit side.
[0069]
The signal correction and sound field control unit 201A on the magnetostrictive actuator side
includes four signal processing units 211 and four high pass filters (HPFs) 212 corresponding to
the four magnetostrictive actuators 103, respectively, and further includes four signals. The
signal processing unit 211 is provided with eight attenuators 210 for attenuating and inputting
the left audio signal AL and the right audio signal AR which constitute stereo audio signals.
[0070]
The respective signal processing units 211 respectively adjust the levels, delay times, frequency
characteristics, etc. of the input audio signals AL, AR, and further perform processing such as
mixing of the audio signals AL, AR (sound field control processing). At the same time, signal
correction processing regarding the output characteristic of the magnetostrictive actuator 103 is
performed.
Each high pass filter 212 extracts high frequency components from the audio signal from the
corresponding signal processing unit 211, and supplies the high frequency component to the
amplifier block 202.
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[0071]
In this case, in each magnetostrictive actuator 103, the high-frequency component of the audio
signal subjected to the sound field control processing and the signal correction processing
independently of each other by the signal correction of the DSP block 201 and the sound field
control unit 201A is It is amplified and supplied. By driving the four magnetostrictive actuators
103 with the high frequency components subjected to the sound field control processing in this
manner, it is possible to enhance the sense of sound expansion due to the high frequency sound
output.
[0072]
On the other hand, the signal correction and sound field control unit 201B on the speaker unit
side includes one signal processing unit 221 and one low pass filter (LPF) 222 corresponding to
the speaker unit 104, and further to the signal processing unit 221. There are provided two
attenuators 220 for attenuating and inputting the left audio signal AL and the right audio signal
AR constituting a stereo audio signal.
[0073]
The signal processing unit 221 adjusts the levels, delay times, frequency characteristics, and the
like of the input audio signals AL and AR, and further performs processing such as mixing of the
audio signals AL and AR (sound field control processing). Perform signal correction processing
on resonance tube characteristics.
The low pass filter 222 extracts low frequency components from the audio signal from the signal
processing unit 221, and supplies the low frequency component to the amplifier block 203.
[0074]
In this case, the low-frequency component of the audio signal subjected to the sound field control
processing and the signal correction processing by the signal correction of the DSP block 201
and the sound field control unit 201B is amplified and supplied to the speaker unit 104 by the
amplifier block 203. Ru. By driving the speaker unit 104 with the low frequency component in
which the sound field control processing has been performed as described above, it is possible to
12-05-2019
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enhance the sense of sound spreading due to the low frequency sound output.
[0075]
In the drive system 200 of FIG. 17, the order of the signal processing unit 211 of the signal
correction and sound field control unit 201A and the high pass filter 212 may be reversed, and
similarly, the signal correction unit of the signal correction and sound field control unit 201B and
The order of the low pass filter 222 may be reversed.
[0076]
Next, another embodiment of the present invention will be described.
12 to 14 show the configuration of a speaker device 100B as an embodiment. 12 is a perspective
view of the speaker device 100B, FIG. 13 is a longitudinal sectional view taken along the line BB
in FIG. 11, and FIG. 14 is a top view of the speaker device 100B. In FIGS. 12 to 14, parts
corresponding to those in FIGS. 1 to 4 are denoted by the same reference numerals, and the
detailed description thereof will be omitted.
[0077]
In the speaker device 100A shown in FIGS. 1 to 4 described above, the pipe 102 which is a
cylindrical diaphragm is used as the acoustic diaphragm. However, in the speaker device 100B,
the flat diaphragm is used as the acoustic diaphragm. A certain rectangular acrylic plate 102B is
used.
[0078]
The acrylic plate 102B is vertically fixed to the base housing 101B via a rectangular
parallelepiped housing fixing plate 141.
In this case, the case fixing plate 141 is attached to the upper surface side of the base case 101B
by adhesion or the like. Then, on the upper surface side of the case fixing plate 141, as shown in
FIG. 13, a groove 142 having a rectangular cross-sectional shape extending in the longitudinal
direction is provided. The lower end portion of the acrylic plate 102B is attached to the housing
12-05-2019
22
fixing plate 141 by, for example, being press-fitted into the groove 142 or further bonded after
being press-fitted into the groove 142.
[0079]
A plurality of, in the present embodiment, two magnetostrictive actuators 103 are mounted on
the case fixing plate 141 so that the displacement direction of the drive rod 103a coincides with
the surface direction of the acrylic plate 102B (vertical direction in this embodiment). It is fixed.
In this case, the magnetostrictive actuator 103 is attached to the case fixing plate 141 by
screwing the fixing tool 143 having a shape along the outer shape of the magnetostrictive
actuator 103 to the side surface of the case fixing plate 141 with a screw 144 There is.
[0080]
A displacement output transmission member 145 is interposed between the drive rod 103 a of
the magnetostrictive actuator 103 and the acrylic plate 102 B. The displacement output
transmission member 145 connects the drive rod 103 a of the actuator 103 to an excitation
point P which is a predetermined point on the surface of the acrylic plate 102 B. In this case,
since the displacement output of the magnetostrictive actuator 103 is transmitted to the
excitation point P of the acrylic plate 102B via the displacement output transmission member
145, the acrylic plate 102B is excited at the excitation point corresponding to the displacement
output of the actuator 103. It becomes possible to excite in the surface direction from P.
[0081]
Here, the displacement output transmission member 145 is constituted by a screw 146 as shown
in FIG. 13 in this embodiment. The screw 146 connects the drive rod 103 a of the
magnetostrictive actuator 103 and the excitation point P of the acrylic plate 102 B. That is, the
drive rod 103a of the magnetostrictive actuator 103 and the acrylic plate 102B are screwed with
a screw 146 as a rod-like member so as to penetrate. In this case, a through hole for passing the
screw portion of the screw 146 is provided at a position corresponding to the excitation point P
of the acrylic plate 102B, and a screw hole in which an internal thread is cut is provided in the
drive rod 103a. ing.
12-05-2019
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[0082]
The two magnetostrictive actuators 103 are driven with the same high frequency component
SAH by a drive system as shown in FIG. 8 described above, for example, and the respective drive
rods 103a are displaced in correspondence with the high frequency component SAH.
Alternatively, these two magnetostrictive actuators 103 are driven by the high frequency
components SAH1 and SAH2 independent of each other, for example, by the drive systems as
shown in FIG. 10 and FIG. 11 described above, and the respective drive rods 103a are It displaces
according to component SAH1 and SAH2.
[0083]
In the speaker device 100B, the acoustic diaphragm is a rectangular acrylic plate 102B which is a
flat diaphragm, and the acoustic diaphragm can not be used as a resonance tube. Therefore, the
upper surface side of the opening 105 of the base housing 101B is closed, and a closed space as
a back cavity is formed on the back surface side of the speaker unit 104 so that the bass sounds
well.
[0084]
The operation of the speaker device 100B shown in FIGS. 12 to 14 will be described.
[0085]
The two magnetostrictive actuators 103 fixed to the housing fixing plate 141 are driven by, for
example, the high frequency component SAH of the monaural sound signal SA, and the drive rods
103a thereof are displaced corresponding to the high frequency component SAH.
The displacement of the drive rod 103 a (displacement output of the actuator 103) is transmitted
to the excitation point P of the acrylic plate 102 B via the displacement output transmission
member 145. Therefore, the acrylic plate 102B is excited in the surface direction from the
excitation point P in response to the displacement output of the actuator 103.
[0086]
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24
In this case, the excitation point P of the acrylic plate 102B is excited by the longitudinal wave,
and an elastic wave (vibration) propagates in the surface direction through the acrylic plate
102B. Then, when the elastic wave propagates through the acrylic plate 102B, mode conversion
of longitudinal waves, transverse waves, longitudinal waves,... Is repeated, and the mixed waves
of longitudinal waves and transverse waves become mixed waves, and the inboard direction of
the acrylic plate 102B Vibrations in the direction perpendicular to the plane) are excited. As a
result, sound waves are emitted from one surface and the other surface of the acrylic plate 102B.
That is, a high frequency sound output corresponding to the high frequency component SAH is
obtained from the outer surface of the acrylic plate 102B.
[0087]
Further, the speaker unit 104 attached to the lower surface side of the base housing 101B is
driven by the low frequency component SAL of the monaural sound signal SA. Then, an audio
output (positive phase) in a low band is obtained from the front surface of the speaker unit 104,
and this audio output is radiated to the outside from the lower surface side of the base housing
101B.
[0088]
According to the speaker device 100B shown in FIGS. 12 to 14, the magnetostrictive actuator
103 driven by, for example, the high-frequency component SAH of the monaural audio signal SA
is the acrylic plate 102B as in the speaker device 100A shown in FIGS. From the excitation point
P in the surface direction. Therefore, a large transverse wave is not generated at the excitation
point P, and the sound wave from the excitation point P is not heard as a very loud sound as
compared to the sound waves emitted from other positions, and the acrylic plate 102B The
sound image can be localized over the entire surface, and a sound image with a sense of spread
can be obtained.
[0089]
Further, according to the speaker device 100B shown in FIGS. 12 to 14, the displacement output
of the magnetostrictive actuator 103 is transmitted to the excitation point P on the surface of the
acrylic plate 102B via the displacement output transmission member 145. The displacement
output of the magnetostrictive actuator 103 can be transmitted to the acrylic plate 102B more
12-05-2019
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faithfully than, for example, one in which the drive rod 103a of the magnetostrictive actuator
103 simply contacts the end face of the acrylic plate 102B. Faithful voice output can be obtained.
[0090]
Further, according to the speaker device 100B shown in FIGS. 12 to 14, the displacement output
transfer member 145 penetrates the drive rod 103a of the magnetostrictive actuator 103 and
the acrylic plate 102B, and connects the drive rod 103a and the acrylic plate 102B. It is assumed
to have 146.
Therefore, even when the case fixing plate 141 exists on the lower end side of the acrylic plate
102B, the magnetostrictive actuator 103 can be disposed on one surface side of the acrylic plate
102B, and the displacement output of the magnetostrictive actuator 103 is made to the acrylic
plate 102B. It can be transmitted well.
[0091]
Next, another embodiment of the present invention will be described. FIG. 15 and FIG. 16 show
the configuration of the speaker device 100C as the embodiment. FIG. 15 is a perspective view of
the speaker device 100C, and FIG. 16 is a top view of the speaker device 100C. In FIGS. 15 and
16, parts corresponding to those in FIGS. 12 to 14 are given the same reference numerals, and
the detailed description thereof will be omitted.
[0092]
In the speaker device 100C, a magnetostrictive actuator 103C is used instead of the
magnetostrictive actuator 103. As described above, the magnetostrictive actuator 103 has the
drive rod 103a for obtaining a displacement output only at one end. On the other hand, as shown
in FIG. 17, the magnetostrictive actuator 103C has drive rods 103a1 and 103a2 displaced in line
symmetry on one end side and the other end side.
[0093]
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26
The predetermined number of magnetostrictive actuators 103C in this embodiment is such that
the displacement directions of the drive rods 103a1 and 103a2 coincide with the surface
direction of the acrylic plate 102B (vertical direction in this embodiment). It is fixed to In this
case, the magnetostrictive actuator 103C is attached to the acrylic plate 102B by screwing a
fixture 171 having a shape along the outer shape of the magnetostrictive actuator 103C to the
acrylic plate 102B with a screw 172.
[0094]
A displacement output transfer member 173-1 is interposed between the drive rod 103a1 of the
magnetostrictive actuator 103C and the acrylic plate 102B. The displacement output transfer
member 173-1 connects the drive rod 103a1 of the actuator 103C to the excitation point P1,
which is a first point on the surface of the acrylic plate 102B. In this case, since the displacement
output of the magnetostrictive actuator 103C is transmitted to the excitation point P1 of the
acrylic plate 102B via the displacement output transfer member 173-1, the acrylic plate 102B
corresponds to the displacement output of the magnetostrictive actuator 103C, It becomes
possible to excite in the surface direction from the excitation point P1.
[0095]
Here, as shown in FIG. 17, the displacement output transfer member 173-1 is constituted by a
screw 174-1 in this embodiment. The screw 174-1 connects the drive rod 103a1 of the
magnetostrictive actuator 103C and the excitation point P1 of the acrylic plate 102B. That is, the
drive rod 103a1 of the magnetostrictive actuator 103C and the acrylic plate 102B are penetrated
by screwing with the screw 174-1 as a rod-like member. In this case, a through hole for passing
the screw portion of the screw 174-1 is provided at a position corresponding to the excitation
point P1 of the acrylic plate 102B, and a screw hole in which an internal thread is cut is provided
in the drive rod 103a1. It is provided.
[0096]
Further, a displacement output transfer member 173-2 is interposed between the drive rod
103a2 of the magnetostrictive actuator 103C and the acrylic plate 102B. The displacement
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output transfer member 173-2 connects the drive rod 103a2 of the actuator 103C to the
excitation point P2, which is a second point on the surface of the acrylic plate 102B. In this case,
since the displacement output of the magnetostrictive actuator 103C is transmitted to the
excitation point P2 of the acrylic plate 102B via the displacement output transfer member 173-2,
the acrylic plate 102B corresponds to the displacement output of the magnetostrictive actuator
103C, It becomes possible to excite in the surface direction from the excitation point P2.
[0097]
Here, the displacement output transfer member 173-2 is configured by a screw 174-2 as shown
in FIG. 17 in this embodiment. The screw 174-2 connects the drive rod 103a2 of the
magnetostrictive actuator 103C and the excitation point P2 of the acrylic plate 102B. That is, the
drive rod 103a2 of the magnetostrictive actuator 103C and the acrylic plate 102B are penetrated
by screwing with a screw 174-2 as a rod-like member. In this case, a through hole for passing the
screw portion of the screw 174-2 is provided at a position corresponding to the excitation point
P2 of the acrylic plate 102B, and a screw hole in which an internal thread is cut is provided in
the drive rod 103a2. It is provided.
[0098]
The magnetostrictive actuator 103C is driven by the high frequency component SAH of the audio
signal by a drive system as shown in FIG. 8 described above, for example, and the drive rods
103a1 and 103a2 are displaced in line symmetry with each other corresponding to the high
frequency component SAH. Do. For example, when the drive rod 103a1 is displaced upward, the
drive rod 103a2 is displaced downward, and conversely, when the drive rod 103a1 is displaced
downward, the drive rod 103a2 is displaced upward.
[0099]
The other components of the speaker device 100C are configured in the same manner as the
speaker device 100B shown in FIGS.
[0100]
The operation of the speaker device 100C shown in FIGS. 15 and 16 will be described.
12-05-2019
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[0101]
The magnetostrictive actuator 103C fixed to the acrylic plate 102B is driven by, for example, the
high frequency component SAH of the monaural sound signal SA, and the drive rods 103a1 and
103a2 are displaced in line symmetry with each other corresponding to the high frequency
component SAH.
The displacement of the drive rods 103a1 and 103a2 (displacement output of the actuator
103C) is transmitted to the excitation points P1 and P2 of the acrylic plate 102B via the
displacement output transmission members 173-1 and 173-2.
Therefore, the acrylic plate 102B is excited in the surface direction from the excitation points P1
and P2 in accordance with the displacement output of the actuator 103C.
[0102]
In this case, the excitation points P1 and P2 of the acrylic plate 102B are excited by longitudinal
waves, and an elastic wave (vibration) propagates in the surface direction through the acrylic
plate 102B. Then, when the elastic wave propagates through the acrylic plate 102B, mode
conversion of longitudinal waves, transverse waves, longitudinal waves,... Is repeated, and the
mixed waves of longitudinal waves and transverse waves become mixed waves, and the inboard
direction of the acrylic plate 102B Vibrations in the direction perpendicular to the plane are
excited. As a result, sound waves are emitted from one surface and the other surface of the
acrylic plate 102B. That is, a high frequency sound output corresponding to the high frequency
component SAH is obtained from the outer surface of the acrylic plate 102B. In addition, the
operation | movement which concerns on the speaker unit 104 is the same as that of the speaker
apparatus 101B shown to FIGS. 12-14.
[0103]
According to the speaker device 100C shown in FIGS. 15 and 16, the magnetostrictive actuator
103C driven by, for example, the high-frequency component SAH of the monaural audio signal
SA is the acrylic plate 102B as in the speaker device 100A shown in FIGS. From the excitation
points P1 and P2 in the surface direction. Therefore, large transverse waves are not generated at
12-05-2019
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the excitation points P1 and P2, and the sound waves from the excitation points P1 and P2 are
not heard as a very loud sound as compared to the sound waves emitted from other positions.
The sound image can be localized over the entire surface of the acrylic plate 102B, and a sound
image with a sense of spread can be obtained.
[0104]
Further, according to the speaker device 100C shown in FIGS. 15 and 16, the displacement
output of the magnetostrictive actuator 103C is the excitation point P1 on the surface of the
acrylic plate 102B through the displacement output transfer members 173-1 and 173-2. And P2,
for example, the displacement output of the magnetostrictive actuator 103C is faithfully
transmitted to the acrylic plate 102B as compared with the case where the drive rods 103a1 and
103a2 of the magnetostrictive actuator 103C are simply abutted against the end face of the
acrylic plate 102B. It is possible to obtain an audio output faithful to the audio signal from the
acrylic plate 102B.
[0105]
Further, according to the speaker device 100C shown in FIGS. 15 and 16, the magnetostrictive
actuator 103C has the drive rods 103a1 and 103a2 displaced in line symmetry with each other,
and the displacement output obtained by the drive rods 103a1 and 103a2 is It is transmitted to
the excitation points P1 and P2 of the acrylic plate 102B via the displacement output transfer
members 173-1 and 173-2 and the excitation point for the acoustic diaphragm (acrylic plate
102B) by one magnetostrictive actuator is Since there are two points, it is possible to further
enhance the sense of the sound image's spread.
[0106]
Next, another embodiment of the present invention will be described.
FIG. 18 shows the configuration of a speaker device 100D as an embodiment.
FIG. 18 shows a perspective view of the speaker device 100D.
[0107]
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30
In the speaker device 100D, a magnetostrictive actuator 103C is attached to one surface of a
box-shaped acoustic diaphragm 102D. The attachment of the magnetostrictive actuator 103C to
the acoustic diaphragm 102D is performed in the same manner as the attachment of the
magnetostrictive actuator 103C to the acrylic plate 102B in the speaker device 100C shown in
FIGS. 15 and 16 described above.
[0108]
Further, as in the connection between the drive rods 103a1 and 103a2 of the magnetostrictive
actuator 103C and the acrylic plate 102B in the speaker device 100C shown in FIGS. 15 and 16
described above, the drive rods 103a1 and 103a2 of the magnetostrictive actuator 103C
respectively output displacement The transmission members 173-1 and 173-2 are connected to
mutually different excitation points P1 and P2 of the acoustic diaphragm 102D.
[0109]
The operation of the speaker device 100D shown in FIG. 18 will be described.
[0110]
The magnetostrictive actuator 103C fixed to the acoustic diaphragm 102D is driven by, for
example, a monaural sound signal, and the drive rods 103a1 and 103a2 are displaced in line
symmetry with each other corresponding to the sound signal.
The displacement of the drive rods 103a1 and 103a2 (displacement output of the actuator
103C) is transmitted to the excitation points P1 and P2 of the acoustic diaphragm 102D via the
displacement output transmission members 173-1 and 173-2.
Therefore, the acoustic diaphragm 102D is excited in the surface direction from the excitation
points P1 and P2 corresponding to the displacement output of the actuator 103C.
[0111]
In this case, the excitation points P1 and P2 of the acoustic diaphragm 102D are excited by
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longitudinal waves, and an elastic wave (vibration) propagates in the surface direction through
the acoustic diaphragm 102D. And when this elastic wave propagates on each surface of acoustic
diaphragm 102D, mode conversion of longitudinal wave, transverse wave, longitudinal wave ... is
repeated, and it becomes a mixed wave of longitudinal wave and transverse wave, acoustic
diaphragm 102D by the transverse wave. Vibration in the in-plane direction (direction
perpendicular to the surface) is excited. Thus, sound waves are emitted from each surface of the
box-shaped acoustic diaphragm 102D. That is, an audio output corresponding to the audio signal
is obtained from each surface of the acoustic diaphragm 102D.
[0112]
According to the speaker device 100D shown in FIG. 18, similarly to the speaker device 100A
shown in FIGS. 1 to 4, the magnetostrictive actuator 103C driven by an audio signal is a boxshaped acoustic diaphragm 102D at excitation points P1, P1. From P2, it excites in the surface
direction. Therefore, large transverse waves are not generated at the excitation points P1 and P2,
and the sound waves from the excitation points P1 and P2 are not heard as a very loud sound as
compared to the sound waves emitted from other positions. A sound image can be localized over
each surface of the box-shaped acoustic diaphragm 102D, and a sound image having a sense of
spread can be obtained.
[0113]
Further, according to the speaker device 100D shown in FIG. 18, the displacement output of the
magnetostrictive actuator 103C is an excitation point on the surface of the box-shaped acoustic
diaphragm 102D via the displacement output transfer members 173-1 and 173-2. The
displacement output of the magnetostrictive actuator 103C is compared to that transmitted to P1
and P2, for example, as compared with the one in which the drive rods 103a1 and 103a2 of the
magnetostrictive actuator 103C are simply brought into contact with the end face of the
rectangular or cylindrical acoustic diaphragm. It can be faithfully transmitted to the diaphragm
102D, and an audio output faithful to the audio signal can be obtained from the acoustic
diaphragm 102D.
[0114]
Further, according to the speaker device 100D shown in FIG. 18, the displacement output of the
magnetostrictive actuator 103C is an excitation point on the surface of the box-shaped acoustic
diaphragm 102D via the displacement output transfer members 173-1 and 173-2. The
displacement output of the magnetostrictive actuator 103C is favorably transmitted to the boxshaped acoustic diaphragm 102D having no end face and transmitted to P1 and P2, and can be
12-05-2019
32
oscillated in the surface direction.
[0115]
Further, according to the speaker device 100D shown in FIG. 18, the magnetostrictive actuator
103C has the drive rods 103a1 and 103a2 displaced in line symmetry with each other, and the
displacement output obtained by the drive rods 103a1 and 103a2 is the displacement output
transmission The acoustic image is transmitted to the excitation points P1 and P2 of the acrylic
plate 102B through the members 173-1 and 173-2, and there are two excitation points for the
acoustic diaphragm 102D by one magnetostrictive actuator. It can further enhance the sense of
spread.
[0116]
In the above-described speaker devices 100A to 100D, a speaker device using a cylindrical, flat,
or box-shaped acoustic diaphragm has been shown, but the present invention can be applied to
other shapes, for example, an acoustic diaphragm such as a spherical shape. The same applies to
those using.
In that case, when using the acoustic diaphragm of the shape without an end surface, the
displacement output transmission member as shown by the above-mentioned speaker apparatus
100B-100D may be used, for example.
[0117]
Further, in the above embodiment, although the actuator for vibrating the acoustic diaphragm is
a magnetostrictive actuator, other actuators such as an electrodynamic actuator and a
piezoelectric actuator may be used as the actuator. Can be obtained.
[0118]
According to the present invention, it is possible to obtain a sound image with a sense of
expansion, to obtain an audio output faithful to an audio signal, and further to increase the
freedom in selecting the shape of the acoustic diaphragm. The present invention can be applied
to a speaker device or the like in an audio visual device.
[0119]
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33
It is a perspective view which shows the structure of the 
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