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JP2014007555

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DESCRIPTION JP2014007555
Abstract: To provide a speaker device that can be miniaturized while suppressing vibration.
SOLUTION: The cabinet has n pieces (n is an integer of 2 or more and rotationally symmetrical
with a virtual front side baffle plate, a virtual back side baffle plate, and a virtual front side baffle
plate, which has a predetermined angle with the virtual front side baffle plate). And an imaginary
rear side baffle plate, and n rear side baffle plates having a predetermined angle and rotational
symmetry with respect to the central axis. A front side speaker unit and a rear side speaker unit
are attached to the front side baffle plate and the rear side baffle plate, respectively. The supply
unit supplies the same signal in the same phase to the front side speaker unit and the rear side
speaker unit. The front side speaker unit and the rear side speaker unit are arranged so as to
shift the two-dimensional arrangement when viewed from the sound output direction so as to
shorten the distance between the front side baffle plate and the rear side baffle plate . [Selected
figure] Figure 1
Speaker device
[0001]
The present invention relates to a speaker device that suppresses vibration.
[0002]
When an acoustic signal is reproduced by the speaker device, vibrations may be generated with
the sound, transmitted to a housing of the speaker device, a floor, a wall, or the like, the sound
may be muddy, and the sound quality may be impaired.
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In particular, in a speaker device that reproduces a low sound range, the mass of the vibrating
member such as the diaphragm is large, and the movement of the center of gravity due to the
vibration is large, so the vibration often becomes large.
[0003]
In order to suppress such vibration of the speaker device, a speaker device is known in which
two speaker units are attached in opposite directions and driven in the same phase (for example,
see Patent Document 1).
[0004]
JP, 2006-352367, A
[0005]
In the speaker device described in Patent Document 1, a pair of speaker units are attached to a
speaker box with sound emission directions reverse to each other.
Therefore, the vibration from each speaker unit is mutually offset, and the vibration is
suppressed.
[0006]
However, attaching the pair of speaker units in this manner requires a thickness for two speaker
units, which results in an increase in the size of the speaker device.
As described above, in the conventional speaker device, there is a problem that the speaker
device is increased in size when the vibration is suppressed.
[0007]
Therefore, the problem to be solved by the present invention is to provide a speaker device
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capable of suppressing vibration and downsizing.
[0008]
In order to solve the above problems, the present invention provides the following apparatus.
1) In a speaker device provided with a plurality of speaker units on the front and back sides of
the enclosure, the speaker device (1) abuts on the front side of the enclosure (10) and is
orthogonal to the sound output axis of the speaker device N (n is an integer of 2 or more) front
side baffle plates (102a, 102b) rotationally symmetric to the output shaft with a predetermined
angle with respect to the surface side virtual surface (102K), and an enclosure (10 N pieces (n is
2 or more) that have a predetermined angle with respect to the back side virtual surface (103K)
that abuts the back side of the) and is orthogonal to the output axis of the sound of the speaker
device Enclosure with the back side baffle plate (103a, 103b) and n front side speaker units
(each attached to the n front side baffle plates) 01a, 101b) and n rear side speaker units (101c,
101d) attached to the n rear side baffle plates, an input unit (31) for inputting an acoustic signal,
and n front side speakers A supply unit (32) for supplying an acoustic signal input to the input
unit to the unit and the n rear speaker units in the same phase; n front speaker units and n rear
speaker units The sound output such that the vibration by the n front side speaker units and the
vibration by the n back side speaker units cancel each other, and the thickness of the enclosure
in the sound output direction is reduced. A speaker device characterized in that two-dimensional
arrangements when viewed from a direction are arranged at mutually offset positions. 2) n front
speaker units and n rear speaker units so that vibration by the n front speaker units and
vibration by the n rear speaker units are in the same straight line and in opposite directions And
the speaker device according to 1), which is disposed. 3) The speaker device according to 1),
characterized in that a duct (504) for connecting the inside and the outside of the enclosure (50)
and emitting the sound inside the enclosure is provided. 4) A cabinet (61) for covering the
enclosure (60), and a duct (604) for connecting the inside and the outside of the cabinet and
emitting sound from the inside of the cabinet are provided as described in 1). Speaker device. 5)
The speaker device according to 4), further comprising a duct (605) for connecting the inside of
the enclosure (60) to the outside of the cabinet and emitting a sound from the inside of the
enclosure.
6) The duct (604) for emitting the sound in the interior of the cabinet (61) and the duct (605) for
emitting the sound in the interior of the enclosure (60) are slit-shaped ducts arranged
substantially on the same straight line The speaker apparatus as described in 5) characterized by
the above. 7) The supplying unit (72) inputs the phase of the signal supplied to the n back side
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speaker units (101c, 101d) to the sound signal supplied to the n front side speaker units (101a,
101b) The speaker device according to any one of 1) to 6), which is delayed according to the
frequency of the acoustic signal input to the speaker device.
[0009]
ADVANTAGE OF THE INVENTION According to the speaker apparatus of this invention, a
speaker apparatus which can suppress a vibration and can be miniaturized can be provided.
[0010]
It is a perspective view of 1st Example of the speaker apparatus of this invention.
It is a six-sided figure of 1st Example of the speaker apparatus of this invention. It is a block
block diagram of 1st-3rd Example of the speaker apparatus of this invention. It is a schematic
diagram which shows the vibration of 1st-3rd Example of the speaker apparatus of this
invention. It is a perspective view of 2nd Example of the speaker apparatus of this invention. It is
a perspective view of 3rd Example of the speaker apparatus of this invention. It is a block block
diagram of 4th Example of the speaker apparatus of this invention.
[0011]
Hereinafter, a speaker device of the present invention will be described based on an embodiment
with reference to the accompanying drawings.
[0012]
First Embodiment <Configuration> FIG. 1 is a perspective view showing a speaker device 1
according to a first embodiment of the present invention, and FIG. 2 is a six-sided view of the
speaker device 1.
1 and 2, the circuit portion of the speaker device 1 is not shown, but only the arrangement of the
enclosure and the speaker unit is shown for ease of understanding.
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[0013]
In FIG. 1, a virtual plane orthogonal to the central axis A with respect to the central axis A that is
the output direction of the sound of the speaker device 1 and in contact with the surface in the
output direction of the enclosure 10 is a front side virtual baffle plate 102K. The enclosure 10 is
provided with n front side baffle plates that have a predetermined angle with respect to the front
side virtual baffle plate 102K and are rotationally symmetrical to the central axis A. In the
present embodiment, two front side baffle plates 102 a and 102 b are provided with n = 2. Front
side speaker units 101a and 101b are disposed on the front side baffle plates 102a and 102b,
respectively. The two front side speaker units 101a and 101b are attached at a predetermined
angle with respect to the front side virtual baffle plate 102K.
[0014]
Further, a virtual surface orthogonal to the central axis A and in contact with the rear surface
with respect to the output direction of the enclosure 10 is taken as a rear side virtual baffle plate
103K. The enclosure 10 is provided with n back side baffle plates which have a predetermined
angle with respect to the back side virtual baffle plate 103K and are rotationally symmetrical to
each other with respect to the central axis A. In the present embodiment, two back side baffle
plates 103a and 103b are provided with n = 2. Rear side speaker units 101c and 101d are
disposed on the rear side baffle plates 103a and 103b, respectively. The back side baffle plates
103a and 103b and the back side speaker units 101c and 101d are not shown in FIG. 1, but are
shown in FIG. The two back side speaker units 101c and 101d are attached at a predetermined
angle with respect to the back side virtual baffle plate 103K. The front side speaker units 101a
and 101b and the rear side speaker units 101c and 101d are speaker units having substantially
the same aperture and the same frequency characteristics.
[0015]
As shown in FIG. 2, the front side baffle plates 102a and 102b are triangles extending vertically
from the horizontal line passing through the central axis A on the front side virtual baffle plate
102K with the front side virtual baffle plate 102K at a predetermined angle. It is. Further, the
back side baffle plates 103a and 103b are triangles extending leftward and rightward from the
vertical line passing through the center axis A on the back side virtual baffle plate 103K with the
back side virtual baffle plate 103K at a predetermined angle. The front side speaker units 101a
and 101b are attached to the front side baffle plates 102a and 102b, and the rear side speaker
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units 101c and 101d are attached to the rear side baffle plates 103a and 103b. The side speaker
units 101 c and 101 d are arranged so as not to overlap each other as shown in FIG. 2 when
viewed in the direction of the central axis A. Thus, the distance between the front side virtual
baffle plate 102K and the rear side virtual baffle plate 103K of the enclosure 10 can be
shortened. That is, the enclosure 10 shifts the thickness in the sound output direction of the
speaker device 1 by shifting the two-dimensional arrangement when viewed from the central
axes of the front side speaker units 101a and 101b and the rear side speaker units 101c and
101d. Make it thinner in the other direction. Thereby, the speaker device 1 can be miniaturized.
In addition, since the diameter of the voice coil or magnet on the opposite side is often smaller
than the diameter of the cone paper on the sound output side of the speaker unit, the voice coil
or magnet or the like does not interfere with the speaker unit. By displacing the two-dimensional
arrangement, it is possible to miniaturize the speaker device 1 by shortening the distance
between the front side virtual baffle plate 102K and the rear side virtual baffle plate 103K even if
they overlap slightly in the two-dimensional arrangement. <Operation> FIG. 3 is a block diagram
of the speaker device 1. As shown in FIG. 3, the input unit 31 sends the input acoustic signal to
the supply unit 32. The supply unit 32 supplies the acoustic signals sent from the input unit 31
to the front side speaker units 101a and 101b and the rear side speaker units 101c and 101d in
the same phase.
[0016]
FIG. 4 is a view showing magnitudes and directions of vibrations generated by the front side
speaker units 101a and 101b and the rear side speaker units 101c and 101d. Arrows B and C in
FIG. 4 indicate vibration magnitude and direction when the same signal of positive phase is
applied to each speaker unit. In FIG. 4, b is the center of gravity of a vibrating object such as cone
paper or voice coil of the two front side speaker units 101a and 101b. Arrow B indicates the
magnitude and direction of vibration when the vibration of the vibrating object of the two front
side speaker units 101c and 101d is synthesized. c is the center of gravity of a vibrating object
such as cone paper or voice coil of the two rear side speaker units 101c and 101d. Arrow C
indicates the magnitude and direction of vibration when the vibration of the vibrating object of
the two rear speaker units 101c and 101d is synthesized. As can be seen from FIG. 4, the arrow B
and the arrow C are both on the center axis A of the speaker device 1 and have the same size and
the opposite direction. Therefore, the vibration of the vibrating body of the front side speaker
units 101a and 101b and the vibration of the vibrating body of the rear side speaker units 101c
and 101d cancel each other. Thereby, the speaker device 1 of the first embodiment can be
miniaturized while suppressing vibration.
[0017]
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Second Embodiment <Configuration> Next, a speaker device according to a second embodiment
will be described. The speaker device 5 of the second embodiment is provided with a duct on the
front side baffle plate of the enclosure, and the other parts are the same as those of the speaker
device of the first embodiment.
[0018]
FIG. 5 is a perspective view showing a speaker device 5 according to a second embodiment of the
present invention. As in FIG. 1, for easy understanding, the circuit part of the speaker device 5 is
not shown, and only the arrangement of the enclosure and the speaker unit is shown.
[0019]
In FIG. 5, the front side speaker units 101 a and 101 b are disposed on the front side baffle
plates 502 a and 502 b of the enclosure 50. In addition, rear side speaker units 101c and 101d
(not shown) are arranged on the rear side baffle plates 503a and 503b (not shown) of the
enclosure 50. The arrangement of the front side speaker units 101a and 101b and the rear side
speaker units 101c and 101d is the same as that of the first embodiment, and the block
configuration is also the same as that of the first embodiment. In the speaker device 5 of the
second embodiment, a duct 504 is further provided at the junction of the front side baffle plate
502 a and the front side baffle plate 502 b of the enclosure 50. The duct 504 connects the inside
and the outside of the enclosure 50. <Operation> In the speaker device 5 of the second
embodiment, the sound inside the enclosure 50 is emitted to the outside through the duct 504.
As a result, as in the speaker device of the first embodiment, the size can be reduced while
suppressing the vibration, and a large amount of sound can be output.
[0020]
Third Embodiment <Configuration> Next, a speaker device according to a third embodiment will
be described. The speaker device 6 of the third embodiment is provided with a cabinet on the
outside of the enclosure, and the other parts are the same as the speaker device of the second
embodiment.
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[0021]
FIG. 6 is a perspective view showing a speaker device 6 according to a third embodiment of the
present invention. As in FIGS. 1 and 5, for easy understanding, the circuit part of the speaker
device 6 is not shown, and only the arrangement of the cabinet, the enclosure and the speaker
unit is shown.
[0022]
In FIG. 6, the front side speaker units 101a and 101b are disposed on the front side baffle plates
602a and 602b of the enclosure 60, and the rear side speaker units 101c and 101d (shown) on
the rear side baffle plates 603a and 603b (not shown) of the enclosure 60. Do not place). The
arrangement of the front side speaker units 101a and 101b and the rear side speaker units 101c
and 101d is the same as in the first and second embodiments, and the block configuration is also
the same as in the first and second embodiments. In the speaker device 6 of the third
embodiment, a cabinet 61 is provided outside the enclosure 60, and a slit-shaped duct 604 is
provided in the cabinet 61. The duct 604 has a predetermined length set so that the sound in the
frequency band mainly reproduced by the speaker device 6 resonates, and connects the inside
and the outside of the cabinet 61.
[0023]
In general, a gas-stored vessel having an opening is called a Helmholtz resonator, and its
resonance frequency is expressed by the following equation. f = (v / 2π) × √ [S / [V (L + δ)]
formula (1) where f: Helmholtz resonance frequency (Hz) v: speed of sound (m / s) S: cross
section of duct (m <2 >) V: Box internal capacity (m <3>) L: Duct length (m) δ: Opening end
length correction (m) However, when r = √ (S / π), δ = 0.6 r When the duct 504 of this
embodiment is calculated by the equation (1), for example, V = 0.06 × 0.3 × 0.4 = 7.2 × 10 <3> (m <3>) v = 340 (m / S) When S = 0.025 × 0.025 × π = 1.96 × 10 <-3> (m <2>) L = 0.25
(m), f = 54.9 (Hz) and Become. Since the low frequency bass reflex type speaker often sets the
resonance frequency to 10 Hz to several tens Hz, it is preferable to set to such a value.
[0024]
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Further, in the speaker device 6, a duct 605 is provided at a junction of the front side baffle plate
602 a and the front side baffle plate 602 b of the enclosure 60. The duct 605 penetrates the
cabinet 61 to connect the inside of the enclosure 60 and the outside of the cabinet 61, and emits
the sound inside the enclosure 60 to the outside. FIG. 6 shows an example in which a slit-shaped
duct 605 extending in the left and right direction is provided at the junction of the front side
baffle plate 602 a and the front side baffle plate 602 b. By making the sound outlet slit-shaped,
the duct 604 and the duct 605 can be arranged side by side on substantially the same straight
line. Such a speaker device 6 can be embedded and installed in the wall only by exposing the
duct 604 and the duct 605 from the slit provided in the wall.
[0025]
In addition, the inner dimension in the direction of the output axis A of the cabinet 61 is
substantially the same as the distance between the front side virtual baffle plate and the rear side
virtual baffle plate, that is, the maximum thickness of the enclosure 60. At this time, since the
front side speaker unit and the rear side speaker unit have an inclination of a predetermined
angle with respect to the front side virtual baffle plate and the rear side virtual baffle plate,
respectively, the space generated thereby is used. , To emit sound from the speaker unit.
<Operation> The speaker device 6 of the third embodiment is provided with the cabinet 61 so
that the sound output from the front speaker units 101a and 101b toward the front and the
sound from the rear speaker units 101c and 101d to the back The sound output resonates in the
cabinet 61. Furthermore, the sound resonated once in the cabinet 61 is emitted from the duct
604.
[0026]
Further, since the duct 605 of the enclosure 60 is connected to the outside of the cabinet 61, the
sound inside the enclosure 60 is emitted to the outside through the duct 65. Thus, in the speaker
device 6 of the third embodiment, the sound output from the front side speaker units 101a and
101b and the rear side speaker units 101c and 101d is emitted to the outside through the duct
604 and the enclosure 60 The sound of the inside is emitted to the outside through the duct 605.
Therefore, similarly to the speaker device of the first embodiment, this makes it possible to
miniaturize while suppressing the vibration and to output a larger amount of sound.
Furthermore, the speaker device 6 can be embedded in the wall only by providing one slit in the
wall and exposing the duct 604 and the duct 605 from the slit provided in the wall, and the
speaker device 6 can be made inconspicuous .
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[0027]
Furthermore, the front side speaker units 101a and 101b and the rear side speaker units 101c
and 101d have predetermined angles with the front side virtual baffle plate 102K and the rear
side virtual baffle plate 104K, respectively, Even if the inner size of the cabinet 605 is
substantially the same as the outer size of the enclosure 601, sound can be emitted because a
space exists on the front of the speaker unit. That is, the thickness of the cabinet can be reduced
to miniaturize the speaker device.
[0028]
It has been desirable to embed the speaker device in the wall, as architectural designers are more
likely to think that the speaker device is not suitable as an interior. However, in general stores
and homes, the thickness of the wall is not so thick, and vibration shielding is often insufficient.
Conventional speaker devices are thick and difficult to embed in walls. Furthermore, when it was
embedded in the wall, the vibration of the speaker device was transmitted, and the sound became
muddy and the sound quality deteriorated. On the other hand, since the speaker device of the
present embodiment can be thinned, it can be embedded in a wall. In addition, since the outlet of
the sound is in the form of a slit, a slit may be provided on the wall, and the presence of the
speaker device can be made inconspicuous. Furthermore, since the vibration is suppressed, the
sound quality is not deteriorated.
[0029]
Fourth Embodiment <Configuration> Next, a speaker device according to a fourth embodiment
will be described. The speaker device 7 of the fourth embodiment is the same as the first
embodiment except that the supply portion of the speaker device of the first embodiment is
changed.
[0030]
FIG. 7 shows a block diagram of the speaker device 7. The acoustic signal input to the input unit
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71 is sent to the supply unit 72. The supply unit 72 includes a phase shift unit 701, a power
amplification unit A 702a, and a power amplification unit B 702b. The acoustic signal input to
the input unit 71 is amplified by the power amplification unit A 702 a and supplied to the front
side speaker units 101 a and 101 b. Further, the acoustic signal input to the input unit 71 is
simultaneously supplied to the phase shift unit 701, and the phase shift unit 701 shifts the
phase. The phase shift unit 701 is a one-stage all-pass filter including, for example, an
operational amplifier, a resistor, and a capacitor. The acoustic signal whose phase is shifted by
the phase shift unit 701 is amplified by the power amplification unit B 702 b and supplied to the
rear side speaker units 101 c and 101 d. In the example of FIG. 7, the phase is changed by the
phase shift unit 701 provided in front of the power amplification unit B 702 b, amplified by two
independent power amplification units, and supplied to two sets of speaker units. On the other
hand, after amplification by one power amplification unit, the phase may be changed using an LC
circuit or the like in front of the speaker unit to change the relative phase of the two speaker
units.
[0031]
The phase shift unit 701 changes the phase delay amount according to the frequency of the
input acoustic signal. In the present embodiment, the constant of the resistor and the capacitor is
such that the phase delay amount is 30 degrees or less for the input acoustic signal of 25 Hz or
more, and the phase delay amount for the acoustic signal lower than the input frequency 25 Hz
is It shall be set to be greater than 30 °.
[0032]
Although the phase shift unit 701 shown in FIG. 7 passes one stage of the all-pass filter, the
number of stages may be increased if necessary, or the phase may be shifted by low pass filter or
digital signal processing. Alternatively, the phase shift unit 701 may be provided in the front
stage of the power amplification unit A 702 a and shifted so as to advance the phase of the
power amplification unit A 702 a. <Operation> When an acoustic signal lower than the frequency
25 Hz is input to the input unit 70, the power amplification unit A 702a amplifies and supplies it
to the front side speaker units 101a and 101b, and the phase shift unit 701 is larger than 30 °.
The phase is delayed, amplified by the power amplification unit B 702 b, and supplied to the rear
side speaker units 101 c and 101 d. Now, assuming that 25 Hz is equal to or less than the
reproduction limit frequency of the speaker unit, the speaker device 7 does not output as sound,
but vibration occurs. Because the phase delay is large, the vibrations of the front side speaker
unit and the rear side speaker unit do not cancel each other out, and vibrations occur. Vibration
03-05-2019
11
at a frequency lower than the reproduction limit frequency does not make the sound muddy. On
the other hand, such low frequency vibration is transmitted to the wall and the floor, so that the
vibration can be felt and thereby the bass feeling is improved.
[0033]
Humans detect air vibration due to sound and secondary generated vibration throughout the
body, but for example, detection of tactile vibration of skin has a lower frequency band to be
detected than detection of sound by tympanic membrane Are known. Therefore, by generating
vibrations in a low frequency band lower than the reproduction limit frequency, it is possible to
improve the feeling of bass by touch.
[0034]
On the other hand, for an acoustic signal in a reproducible frequency band, the phase delay is 30
° or less, and the vibrations of the front side speaker unit and the rear side speaker unit cancel
each other. Thus, as in the first to third embodiments, it is possible to suppress the vibration and
to prevent the muddy of the sound.
[0035]
As described above, the speaker device of the present embodiment can be miniaturized while
suppressing vibration, and can further improve the bass feeling.
[0036]
In the speaker devices of the second and third embodiments, the supply unit 32 can be replaced
with the supply unit 72 of the fourth embodiment to change the phase, and the fourth
embodiment described above It produces the same effect as
[0037]
Reference Signs List 1, 5, 6 speaker device 10, 50, 60 enclosure 102, 502, 602 front side baffle
plate 101a, 101b front side speaker unit 101c, 101d rear side speaker unit 103, 503, 603 rear
side baffle plate 31, 71 input portion 32, 72 Supply unit 504, 604, 605 Duct 61 Cabinet 701
Phase shift unit 702a Power amplification unit A 702b Power amplification unit B
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