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JP2007312168

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DESCRIPTION JP2007312168
An object of the present invention is to reduce the influence of gas flow for emitting sound on the
vibration of a vibrating body. A vibrator (10) vibrates in response to an acoustic signal (S). The
space forming member 30 forms the spaces R1 and R2 together with the side surface of the
vibrating body 10. The air supply unit 42 compresses the gas and supplies it to the space R1. The
exhaust unit 44 sucks the gas in the space R2. A sound emitting space R0 is formed on the
opposite side of the vibrating body 10 to the spaces R1 and R2. By causing the sound emission
space R0 to communicate with any of the spaces R1 and R2 in accordance with the position of
the vibrator 10, the gas in the sound emission space R0 vibrates according to the acoustic signal
S. [Selected figure] Figure 1
Acoustic radiation device
[0001]
The invention relates to an apparatus for emitting sound.
[0002]
A technology for emitting sound by supplying and exhausting a gas according to an acoustic
signal has been conventionally proposed.
For example, as shown in FIG. 16, the speaker disclosed in Patent Document 1 encloses a
vibrating body 91 that vibrates according to an acoustic signal, and a space R (hereinafter
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referred to as “sound emitting space”) above the vibrating body 91. A horn 92 and an air feed
space Ra and an air feed space Rb formed on the side of the vibrating body 91 are provided. Air
is supplied into the air feed space Ra, and the air in the air delivery space Rb is discharged to the
outside by suction. Inside the vibrating body 91, a path 93 extending from the side wall surface
of the vibrating body 91 to the upper end surface is formed. According to the position of the
vibrating body 91, any one of the air feeding space Ra and the air sending space Rb selectively
communicates with the sound emitting space R via the path 93, so that the vibration according to
the acoustic signal is emitted. It is given to the air in the space R. Japanese Patent Publication No.
46-12673
[0003]
However, in the configuration of FIG. 16, the direction of the air from the air supply space Ra to
the sound emission space R and the direction of the air from the sound emission space R to the
air discharge space Rb change inside the vibrator 91, so the path 93 There is a problem that the
pressure of air passing through is likely to affect the vibration of the vibrating body 91. For
example, vibration of the vibrating body 91 is suppressed by the action of the component force
in the downward direction of the pressure of the air passing through the path 93, so it is difficult
to efficiently output the sound of high sound pressure. Further, the degree to which the air
passing through the path 93 affects the vibration of the vibrating body 91 differs according to
the frequency of the acoustic signal, so the sound pressure (intensity) of the sound output from
the horn 92 is uneven for each frequency band. And Hi-Fi may be lost. In view of the above
circumstances, the present invention aims to solve the problem of reducing the influence of gas
flow for emitting sound on the vibration of a vibrating body.
[0004]
In order to solve the above problems, an acoustic radiation device according to the present
invention vibrates in response to an electrical signal and has a vibrating body having a side
surface substantially parallel to the direction of the vibration, and a first space together with the
side surface of the vibrating body A first space forming member (for example, members 31 and
32 in FIG. 1) forming the space R1 in FIG. 1 and a second space forming member forming a
second space (for example, space R2 in FIG. 1) with the side surface of the vibrating body (For
example, members 32 and 33 in FIG. 1), an air supply unit that compresses a gas and supplies
the gas into the first space, and an exhaust unit that sucks the gas in the second space By
connecting the sound emission space (for example, the sound emission space R0 in FIG. 1)
opposite to the first space and the second space to either the first space or the second space
according to the position of the vibrator, The gas in the sound emission space is vibrated.
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[0005]
In the above configuration, since the sound release space is defined on the opposite side to the
first space and the second space with respect to the vibrator, the gas supplied from the first
space to the sound release space and the sound release space The gas discharged into the second
space flows in a direction perpendicular to the direction of vibration of the vibrator.
Therefore, according to the present invention, it is possible to reduce the influence of the flow of
gas for emitting sound on the vibration of the vibrating body.
[0006]
In a preferred aspect of the present invention, the vibrating body is a hollow member including a
tubular side wall (eg, the side wall 12 in FIG. 1) substantially parallel to the direction of vibration
of the vibrating body. A first opening passing through a space and a part on the second space
side (for example, opening O1 in FIG. 1), and a second opening passing through a part of the side
wall facing the first opening (for example, FIG. 1 The sound emission space communicates with
the first space or the second space via the first opening and the second opening. As described
above, by making the vibrating body hollow, it is possible to improve the efficiency of the
vibration by reducing the weight while maintaining the mechanical vibration of the vibrating
body.
[0007]
In a further preferred embodiment, both ends of the vibrator along the direction of vibration of
the vibrator are closed (for example, the closed portion 14 in FIG. 1). According to this aspect,
since the gas passing through the inside of the vibrating body does not leak from both ends of
the vibrating body, it is possible to emit sound with sufficient sound pressure. In addition, there
is also an advantage that the mechanical strength of the vibrator is improved by closing the both
ends.
[0008]
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According to the configuration in which the sound is emitted by the suction of the gas from the
sound emission space in addition to the supply of the gas to the sound emission space, the sound
pressure range of the sound is compared with the structure emitting the sound only by the gas
supply. It is possible to secure widely. In the case of automatically playing a wind instrument
(especially a brass instrument) by the sound emitted from the sound emission space, the present
invention is particularly preferably adopted because a wide range of sound pressure is required
for the sound wave introduced into the mouthpiece. Ru. An acoustic radiation device according to
a preferred embodiment for playing a wind instrument comprises a radiator surrounding a sound
emission space, and a mouthpiece of the wind instrument is attached to the periphery of the
radiator opposite to the vibrator, and the radiator is Connects the inside of the mouthpiece and
the sound emission space.
[0009]
An acoustic radiation device according to a preferred aspect of the present invention comprises a
plurality of drive units (for example, drive units 21 shown in FIG. 9) disposed at respective
positions sandwiching the vibration body along the direction of vibration of the vibration body to
drive the vibration body.・ Has 22). According to this aspect, since both ends of the vibrating
body are controlled by the separate drive units, it is possible to stabilize the posture of the
vibrating body. In the above aspect, the acoustic signal supplied to one drive unit and the
acoustic signal supplied to the other drive unit have, for example, opposite phases. According to
this aspect, since the plurality of driving units cooperate with each other to vibrate the vibrating
body, it is possible to sufficiently secure the amplitude of the vibrating body while reducing the
power consumption in each driving unit.
[0010]
<A: Acoustic Radiation Device> FIG. 1 is a cross-sectional view showing a configuration of an
acoustic radiation device according to one embodiment of the present invention, and FIG. 2 is a
cross-sectional view taken along line II-II in FIG. As shown in FIGS. 1 and 2, the acoustic radiation
device D includes a vibrator 10, a drive unit 21 and an amplifier 27.
[0011]
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The vibrating body 10 is a hollow member formed in a cylindrical shape. That is, the vibrating
body 10 has a shape in which the cylindrical side wall portion 12 and the closed portion 14
closing the both end portions of the side wall portion 12 are integrally formed. Hereinafter, as
shown in FIGS. 1 and 2, one side of the longitudinal cross section P including the central axis of
the vibrating body 10 is referred to as "front side" and the other side is referred to as "back side".
[0012]
The drive unit 21 is means for vibrating the vibrating body 10. The drive part 21 of this
embodiment contains the bobbin 251, the coil 252, the yoke 253, the permanent magnet 254,
and the center pole 255, as shown in FIG. The bobbin 251 is a cylindrical member fixed to the
lower end surface (the closed portion 14) of the vibrating body 10 coaxially with the vibrating
body 10. A coil 252 is wound around the outer peripheral surface of the bobbin 251. The
acoustic signal S is supplied to the coil 252 from the amplifier 27. The acoustic signal S is an
electrical signal that represents the waveform of the acoustic that the acoustic radiation device D
should emit.
[0013]
The yoke 253 is disposed below the vibrating body 10. The vibrating body 10 is connected to the
yoke 253 via a damper 18 that elastically holds the vibrating body 10. The permanent magnet
254 is installed inside the yoke 253, and the center pole 255 is fixed to the tip of the permanent
magnet 254. The coil 252 wound around the bobbin 251 is inserted into a gap (magnetic gap)
between the side surface of the center pole 255 and the magnetic pole of the yoke 253.
Therefore, the vibrating body 10 vibrates in the direction of the central axis (hereinafter referred
to as the “Z direction” as shown in FIG. 1) according to the acoustic signal S supplied to the
coil 252 within the range regulated by the damper 18 Do.
[0014]
As shown in FIG. 1, the acoustic radiation device D includes a space forming member 30, an air
supply unit 42, and an exhaust unit 44. The space forming member 30 is a member that partially
covers approximately half of the side wall portion 12 of the vibrating body 10 located on the
back side, and forms a space in a gap with the outer peripheral surface of the side wall portion
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12. The space forming member 30 of the present embodiment includes three plate-like members
31 to 33 overlapping each other in the Z direction at predetermined intervals. The side end
surface of each of the members 31 to 33 contacts the outer peripheral surface of the side wall
portion 12 of the vibrating body 10. Therefore, as shown in FIGS. 1 and 2, a space R1
surrounded by the members 31, 32 and the outer peripheral surface of the side wall 12 is
formed, and below the space R1, the members 32, 33 and the side wall A space R2 surrounded
by the outer circumferential surfaces of 12 is formed. That is, on the side of the vibrating body
10, independent spaces R1 and R2 partitioned in the Z direction with the member 32 as the
boundary are defined.
[0015]
The air supply unit 42 is a unit (for example, a compression pump) that compresses external air
and supplies the compressed air into the space R1. Moreover, the exhaust part 44 is a means
(vacuum pump) which attracts | sucks the air in space R2, and exhausts it outside. Therefore, the
space R1 is maintained at a positive pressure with reference to the atmospheric pressure, and the
space R2 is maintained at a negative pressure.
[0016]
As shown in FIGS. 1 and 2, the acoustic radiation device D comprises a radiator 50. The radiator
50 is a member that encloses a space R0 on the opposite side to the spaces R1 and R2 (the space
forming member 30) with the vibrating body 10 interposed therebetween (hereinafter referred
to as “sound emitting space”). The radiator 50 of the present embodiment has a shape in
which the space forming portion 52 and the horn portion 54 are integrally formed. As shown in
FIG. 2, the space forming portion 52 is a portion that partially covers approximately half of the
side wall portion 12 of the vibrating body 10 located on the front side. Of the space forming
portion 52, the side end face on the side of the vibrator 10 contacts the outer peripheral surface
of the side wall portion 12, whereby a sound emitting space R0 is formed in the gap between the
outer peripheral surface of the side wall portion 12 and the inner peripheral surface of the space
forming portion 52. It is formed. The horn portion 54 is a substantially cylindrical portion that
communicates with the sound emission space R0 through the opening of the space formation
portion 52.
[0017]
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Next, FIG. 3 is a front view showing the shape of the vibrating body 10 seen from the back side,
and FIG. 4 is a cross-sectional view seen from the line IV-IV in FIG. In FIG. 4, the outer shapes of
the space forming member 30 and the radiator 50 are illustrated by a two-dot chain line. As
shown in FIG. 3 and FIG. 4, a plurality of openings O <b> 1 penetrating through the side wall 12
is formed in a portion on the back side of the side wall 12 of the vibrating body 10. Each opening
O1 is an oblong through hole whose longitudinal direction in the side wall portion 12 is the
longitudinal direction, and as shown in FIG. 3, along the circumferential direction in the vicinity
of the central portion in the Z direction in the side wall portion 12 Arrange. In the state where
power is not supplied to the coil 252, as shown in FIG. 1, the side end surface of the member 32
of the space forming member 30 closes each opening O1. Therefore, the space R1 and the space
R2 are sealed spaces. Further, as shown in FIG. 3 and FIG. 4, one opening O 2 penetrating the
side wall 12 is formed in the front side portion of the side wall 12. The sound emitting space R0
communicates with the inside of the side wall 12 through the opening O2 regardless of the
position of the vibrating body 10 during vibration.
[0018]
In the above configuration, the sound emission space R0 selectively communicates with either
the space R1 or the space R2 according to the vibration of the vibrating body 10. FIG. 5 is a
cross-sectional view showing how the vibrator 10 is displaced upward (negative side in the Z
direction) from the state of FIG. As shown in FIG. 5, when the vibrating body 10 is displaced
upward, the opening O1 moves to the gap between the member 31 and the member 32, so the
space R1 communicates with the inside of the side wall 12 via the opening O1. Therefore, as
illustrated by solid lines in FIGS. 5 and 7, the air A1 supplied from the air supply unit 42 to the
space R1 linearly passes through the opening O1 and the opening O2 in this order. It progresses
and is supplied to sound emission space R0. Since the gap between the members 32 and 33 is
closed by the side wall 12 in the state of FIG. 5, the space R2 does not communicate with the
sound output space R0.
[0019]
FIG. 6 is a cross-sectional view showing how the vibrator 10 is displaced downward from the
state of FIG. As shown in FIG. 6, when the vibrating body 10 is displaced downward, the opening
O1 moves to the gap between the member 32 and the member 33, so this time the space R2
communicates with the inside of the side wall 12 through the opening O1. Do. Therefore, as
shown by the broken lines in FIGS. 5 and 7, air A2 existing in the sound emission space R0
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travels linearly while passing through the opening O2, the opening O1, and the space R2 in this
order. It is then delivered to the exhaust unit 44. In addition, since the gap between the members
31 and 32 is closed by the side wall portion 12, the space R1 does not communicate with the
sound output space R0.
[0020]
As described above, the supply of the air A1 and the exhaust of the air A2 are repeated according
to the vibration of the vibrator 10, whereby the air according to the acoustic signal S is imparted
to the air in the sound output space R0. Sound is emitted as the vibration propagates from the
inside of the horn portion 54 to the outside.
[0021]
As described above, in the present embodiment, since the sound release space R0 is defined on
the opposite side to the space R1 and the space R2 across the vibrating body 10, the air A1 or
the like supplied to the sound release space R0 The air A2 discharged from the sound emission
space R0 flows in a direction perpendicular to the direction (Z direction) of the vibration of the
vibrating body 10. According to this configuration, the pressure of the air A1 · A2 does not easily
act in the direction to suppress the vibration of the vibrating body 10, so that the influence of the
flow of the air A1 · A2 on the vibration of the vibrating body 10 can be reduced is there.
Therefore, it is possible to efficiently output high sound pressure sound. Moreover, since the
influence of air A1 * A2 is suppressed irrespective of the frequency of the vibration of the
vibrating body 10, sound pressure (intensity) is equalized over a wide frequency band. This
makes it possible to maintain the high quality of the sound Hi-Fi.
[0022]
Furthermore, since the air A1 compressed in advance by the air supply unit 42 is supplied to the
sound emitting space R0 according to the vibration of the vibrating body 10, the efficiency is
high compared to a speaker configured to vibrate external air by a cone. The sound pressure of
the sound emission space R0 can be sufficiently raised.
[0023]
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By the way, as a configuration for vibrating air in the sound emission space R0, for example, a
configuration in which only the communication between the space R1 and the sound emission
space R0 is controlled according to the acoustic signal S (that is, a configuration in which the
space R2 is omitted) is considered Be
However, in this configuration (hereinafter referred to as "comparative example"), only the sound
reflecting only the positive polarity part of the acoustic signal S is emitted, and the negative
polarity part of the acoustic signal S is faithfully reproduced. It can not generate sound. On the
other hand, according to the present embodiment, for example, when the acoustic signal S is
positive, the space R1 is communicated with the sound release space R0 to apply positive
pressure, and when negative, the space R2 is released. It is possible to faithfully reflect both
polarities of the sound signal S on the sound (that is, to enhance the Hi-Fi property) in such a
manner as to communicate with the space R0 and apply a negative pressure.
[0024]
The acoustic radiation device D which concerns on the above form is utilized for the automatic
performance of a wind instrument, as shown in FIG. As shown in FIG. 8, the portion (rim portion)
72 to be in contact with the human lip is in contact with the peripheral edge (peripheral portion
of the horn portion 54) of the radiator 50 on the opposite side to the vibrating body 10; The
mouthpiece 70 is attached to the acoustic radiation device D. In the state of FIG. 8, the inside of
the mouthpiece 70 and the sound emission space R0 communicate with each other. Therefore,
when the acoustic radiation device D is operated, a sound wave corresponding to the vibration of
the vibrating body 10 is propagated to the inside of the wind instrument through the sound
emission space R0 and the mouthpiece 70, and a sound wave according to the sound signal S
from the wind instrument Is emitted.
[0025]
Under the above configuration, in order to generate a natural playing sound, it is necessary to
fluctuate the pressure of air introduced into the mouthpiece 70 over a wide range. According to
the present embodiment in which the air A2 is discharged from the sound emission space R0 in
addition to the supply of the air A1 to the sound emission space R0, the sound emission space R0
is compared with the contrast example in which only the air A1 is supplied. It is possible to vary
the sound pressure within the range over a sufficiently wide range. Therefore, the acoustic
radiation device D according to the present embodiment is particularly suitably used for
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automatic playing of a wind instrument as shown in FIG.
[0026]
<B: Modifications> Various modifications can be made to the above embodiment. It will be as
follows if the aspect of a specific deformation is illustrated. In addition, you may combine the
following each aspect suitably.
[0027]
(1) Modification 1 In the above embodiment, the configuration in which the vibrating body 10 is
driven by one drive unit 21 is exemplified, but a configuration in which a plurality of drive units
21 are installed is also adopted. For example, the acoustic radiation device D of FIG. 9 comprises
a drive 22 similar to the drive 21 in addition to the elements of FIG. The drive unit 22 includes a
bobbin 251 fixed to the upper surface of the vibrating body 10 and around which the coil 252 is
wound, and a yoke 253 / permanent magnet 254 and a center pole 255 that form a magnetic
field around the bobbin 251. The coil 252 of the drive unit 22 is supplied with an acoustic signal
/ S in reverse phase to the acoustic signal S. Therefore, the drive units 21 and 22 cooperate with
each other to vibrate the vibrating body 10. According to the configuration of FIG. 9, since both
ends of the vibrating body 10 are regulated, it is possible to stabilize the posture of the vibrating
body 10 as compared with the first embodiment. Moreover, compared with the structure by
which only one drive part 21 was installed, the amplitude of the vibrating body 10 is fully
securable with little power consumption.
[0028]
(2) Modification 2 In the above embodiment, the cylindrical (cylindrical) vibrating body 10 is
exemplified, but the specific form of the vibrating body 10 is appropriately changed. FIGS. 10 to
12 are cross-sectional views (cross-sectional views corresponding to FIG. 4) of the vibrating body
10 according to another aspect as viewed from the Z direction. The vibrating body 10 in FIG. 10
is a hollow member (a member in which the cross section of the side wall portion 12 has a
rectangular frame shape) formed in a square pole shape. The vibrating body 10 in FIG. 11 is a
hollow member (a member in which a cross section of the side wall portion 12 has a
substantially isosceles triangle frame shape) formed into a substantially triangular prism. The
side wall portion 12 of FIG. 11 includes three plate-like portions B1 to B3. An opening O1 is
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formed in one plate-like portion B1. Openings O2 are formed in each of the plate-like portions B2
and B3, and individual radiators 50 communicating with the respective openings O2 are fixed.
According to the above configuration, it is possible to radiate the sound in a plurality of
directions according to the angle between the plate-like portion B2 and the plate-like portion B3.
[0029]
The vibrator 10 shown in FIG. 12 is a plate-like member in which the opening O1 is formed. Also
in the configuration of FIG. 12, one of the spaces R1 and R2 alternatively communicates with the
sound emission space R0 through the opening O1 according to the vibration of the vibrator 10.
As shown in FIG. 12, the vibrator in the present invention does not have to be a hollow member.
However, according to the configuration (FIG. 4, FIG. 10, and FIG. 11) in which the vibrator is a
hollow member, the advantage is that it is easy to secure mechanical strength while reducing the
weight of the vibrator compared to the configuration of FIG. There is. As understood from each of
the above aspects, in the present invention, the vibrator includes a side surface substantially
parallel to the direction of its own vibration (for example, the outer peripheral surface of the side
wall 12), and the first side faces the side surface. It is preferable to adopt a configuration in
which the space (R1) and the second space (R2) are formed, and the sound release space (R0) is
formed on the opposite side to the first space and the second space with the vibrator interposed
therebetween. .
[0030]
(3) Modification 3 A member (hereinafter referred to as “reinforcement body”) for reinforcing
the mechanical strength of the vibration body 10 may be installed on the vibration body 10. For
example, as shown in FIG. 13, a rod-like reinforcing body 16 may be bridged from one point on
the inner peripheral surface of the vibrating body 10 to a point opposite to it.
[0031]
(4) Modification 4 In the example shown in FIG. 8, the sound radiating device D is used for
automatic playing of a wind instrument, but the use of the sound radiating device D is optional.
For example, as shown in FIG. 14, the acoustic radiation device D may be housed in a housing
(speaker box) 60. In the configuration of FIG. 14, the sound emitted from the radiator 50 is
directly perceived by the listener. In addition, although the structure by which one acoustic
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radiation apparatus D was accommodated in the housing | casing 60 was illustrated here, the
several acoustic radiation apparatus D (woofer, squawker, tweeter) which each radiates | emits
the sound of a separate frequency band is a case The structure accommodated in the body 60 is
also adopted.
[0032]
(5) Modification 5 In the above embodiment, the configuration in which the opening O1 is used
for communication between the space R1 and the sound emission space R0 and communication
between the space R2 and the sound emission space R0 is illustrated. As described above, the
opening Oa1 which brings the space R1 into communication with the sound emission space R0
when the vibration body 10 is displaced upward, and the opening which brings the space R2 into
communication with the sound emission space R0 when the vibration body 10 is displaced
downward. The Oa 2 may be formed separately on the side wall 12.
[0033]
It is a sectional view showing composition of an acoustic radiation device concerning one form.
It is sectional drawing seen from the II-II line in FIG. It is a front view which shows the structure
of a vibrating body. It is sectional drawing seen from the IV-IV line in FIG. It is sectional drawing
which shows the state which the vibrating body displaced upward. It is sectional drawing which
shows the state which the vibrating body displaced below. It is sectional drawing which shows
the mode of the flow of air. It is sectional drawing which shows the form which utilized the sound
emission apparatus for automatic performance of a wind instrument. It is sectional drawing
which shows the structure of the acoustic radiation apparatus which concerns on a modification.
It is sectional drawing which shows the structure of the vibrating body which concerns on a
modification. It is sectional drawing which shows the structure of the vibrating body which
concerns on a modification. It is sectional drawing which shows the structure of the vibrating
body which concerns on a modification. It is sectional drawing which shows the structure of the
vibrating body which concerns on a modification. It is sectional drawing which shows the
structure of the acoustic radiation apparatus which concerns on a modification. It is sectional
drawing which shows the structure of the acoustic radiation apparatus which concerns on a
modification. It is sectional drawing which shows the structure of the conventional speaker.
Explanation of sign
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[0034]
D: acoustic radiation device, 10: vibrator, 12: side wall portion, 14: closing portion, 21: driving
portion, 27: amplifier, 30: space forming member, 31 to 33: member, 42: Air supply unit, 44:
Exhaust unit, 50: Radiator, R1, R2: Space, R0: Sound emission space.
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