JP2006332861

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DESCRIPTION JP2006332861
A speaker device capable of controlling vibration of a diaphragm or reducing vibration on an
object such as attachment. A speaker device (21) comprising a substrate (2) and an exciter (3) in
contact with a vibrating portion (5) of the substrate (2). The substrate (2) has an attachment
portion (6) outside the vibrating portion (5). The vibration adjustment layer 9 for controlling the
resonant vibration of the vibrating portion 5 is stacked over the entire periphery outside the
contact portion of the exciter 3, and the attaching portion 6 is for suppressing the vibration
transmitted from the vibrating portion 5. The portion in which the vibration suppressing portion
4 is stacked on the attachment portion 6 is larger than the portion in which the vibration
suppressing portion 4 is stacked and the vibration adjusting layer 9 is stacked on the vibrating
portion 5. The characteristics of the vibration control layer 9 may be partially different. Vibration
adjustment layers (9-1, 9-2, 9-3) in which the outer peripheral region 5b of the vibration unit 5 is
divided into a plurality of annular zones (5b-1, 5b-2, 5b-3) and stacked in the annular zones The
vibration characteristics of) may be made different. [Selected figure] Figure 2
Loudspeaker device, working palate with loudspeaker and wall panel with loudspeaker
[0001]
The present invention relates to a speaker device for causing a diaphragm to be divided and
vibrated by an exciter, and a work port with a speaker and a wall panel with a speaker.
[0002]
Conventionally, in a flat speaker device in which a flat diaphragm is divided and vibrated by an
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exciter, a core material of a honeycomb structure is sandwiched between two film-like surface
layer vibrating members disposed opposite to each other as a diaphragm. A lightweight and
highly rigid honeycomb structure plate, a synthetic resin plate such as an acrylic plate, a veneer
plate or the like is used (Patent Document 1).
Japanese Patent Laid-Open No. 2002-27588
[0003]
The planar diaphragm has the same vibration characteristics (composition) throughout the
surface, and the vibration characteristics are substantially the same throughout. Therefore, in the
conventional flat speaker device, it is difficult to control the vibration of the diaphragm to adjust
the sound quality and the like.
[0004]
By the way, in order to make use of the merit that the thickness dimension can be reduced, the
flat speaker device is attached to the housing surface (wall surface, ceiling surface or floor
surface) facing the listening space, the work palate or the like, or the housing surface or work
palate It is conceivable to integrally form the However, in such mounting, integration or integral
formation, the building housing etc. which received the vibration transmitted from the flat
speaker device is pronounced, and the sounding of the flat loudspeaker and the sounding of the
building housing coexist so that it is difficult to control the sound. I have to In particular, in the
conventional flat speaker device, it is difficult to control the vibration by the diaphragm itself, so
it is difficult to suppress the sound generation of the building frame or the like.
[0005]
Therefore, in order to solve the above problems, the present invention can control the vibration
of the diaphragm, or can reduce the vibration to the object such as attachment, and a wall panel
provided with the speaker device. And it aims at offer of the work palate.
[0006]
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The means adopted by the present invention according to claim 1 in order to control the
vibration of the diaphragm is a speaker apparatus comprising a substrate and an exciter in
contact with the vibrating portion of the substrate, the substrate being taken outside the
vibrating portion A vibration adjustment layer for controlling resonant vibration of the vibrating
portion is stacked over the entire circumference outside the abutting portion of the exciter, and
the mounting portion suppresses the vibration transmitted from the vibrating portion. A speaker
characterized in that a vibration suppressing portion for stacking is disposed, and a bending
rigidity is larger in a portion in which the vibration suppressing portion is stacked on the
attachment portion than in a portion in which the vibration adjusting layer is stacked on the
vibrating portion. It is an apparatus.
The control of the resonant vibration is to shift the resonant frequency from the audible range or
to attenuate the amplitude of the resonant vibration. As the vibration control layer, a control
agent layer made of a control agent applied to the vibrating portion by a self-adhesive force, or a
control plate layer made of a plate material bonded to the vibrating portion with an adhesive is
selected. The modifier layer may adjust the elastic modulus by changing the type of additive or
by containing air bubbles.
[0007]
The means adopted by the present invention according to claim 2 so that the vibration control
can be finely adjusted is the speaker device according to claim 1, wherein the vibration adjusting
layer has partially different vibration characteristics. In order to make the characteristics of the
vibration control layer different, the type and thickness of the adjusting agent are partially
different, or the type and thickness of the plate are partially different.
[0008]
The means adopted by the present invention according to claim 3 in order to facilitate
adjustment of vibration control is characterized in that the vibration adjusting layer is divided
into a plurality of annular zones, and the vibration characteristics of each annular zone are
different. It is a speaker device. In addition, as a planar view shape of each annular zone, there is
a circular outline, a circular outline, an oval outline, an oval outline, and a rectangular outline. For
each annular belt-shaped vibration adjusting layer, the bending stiffness of the portion in which
each annular belt-shaped vibration adjusting layer is laminated on the vibrating portion by
thickening the layer thickness toward the outside away from the abutting portion of the exciter
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Can be suppressed from being transmitted from the vibrating part to the outside by increasing
the value of V in a stepwise or continuous manner.
[0009]
The means adopted by the present invention according to claim 4 in order to make it difficult to
transmit vibrations to the outside and make the working palate with a speaker comprise the
speaker device according to any one of claims 1 to 3 and And a speaker equipped with a speaker.
[0010]
The means adopted by the present invention according to claim 5 is a speaker apparatus
according to any one of claims 1 to 3 in order to make it difficult to transmit vibrations to parts
other than those formed by the vibrating part and to make a wall panel with a speaker. A wall
panel with a speaker, characterized in that a part of a face material of the wall panel is formed by
the substrate.
[0011]
According to the first aspect of the present invention, in the vibrating portion, the contact portion
of the exciter and the portion where the vibration adjustment layer outside the contact portion is
laminated vibrates to generate sound.
At this time, vibration outside the contact portion of the exciter is controlled by the vibration
adjustment layer, and further, vibration transmitted from the vibrating portion to the attachment
portion is suppressed by the vibration suppressing portion.
As a result, in the speaker device according to the present invention, it is not necessary to
prepare a plate material of a special specification processed so that the vibration characteristics
of the contact portion of the exciter, the portion outside the contact portion and the attachment
portion are different. It is possible to easily control the
[0012]
According to the second aspect of the present invention, fine adjustment of the vibration control
of the vibrating portion can be performed by appropriately selecting the vibration characteristics
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of the vibration adjusting layer so as to be partially different.
[0013]
According to the third aspect of the present invention, by appropriately selecting the
characteristics of the vibration adjustment layer stacked in each annular zone, adjustment of the
vibration control of the vibration portion becomes easy.
[0014]
According to the fourth aspect of the present invention, even if a sound is emitted from the lid
surface made of a substrate, it is difficult to transmit the vibration of the vibrating portion (lid
surface) to the lid attachment target through the vibration suppression portion, lid attachment
The sound generation from the object can be eliminated or reduced.
[0015]
According to the fifth aspect of the present invention, even if sound is emitted from the panel
surface made of the substrate, it is difficult for the vibration of the vibrating portion (panel
surface) to be transmitted to the panel surface other than the vibrating portion via the vibration
suppressing portion. Sound generation from the panel surface other than the vibrating portion
can be eliminated or reduced.
[0016]
DESCRIPTION OF THE PREFERRED EMBODIMENTS A loudspeaker apparatus, a working palate
with a loudspeaker and a wall panel with a loudspeaker according to the present invention will
be described based on the embodiments shown in the drawings.
[0017]
(First Embodiment) FIG. 1 shows a speaker apparatus according to a first embodiment of the
present invention, and FIG. 1 (A) is a partially broken back view, and FIG. 1 (B) is a sectional view
The top view which carried out, and the figure (C) are the top views which carried out the section
of the modification.
[0018]
The speaker device 1 of this example includes a substrate 2, an exciter 3, and a vibration
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suppression unit 4.
The planar substrate 2 is made of the same material as that of the conventional diaphragm, and,
for example, a core material of a honeycomb structure between two film-like surface layer
vibration members and back layer vibration members disposed opposite to each other. A
lightweight and highly rigid honeycomb structure board, a synthetic resin board such as an
acrylic board, a veneer board, etc. are selected.
In the substrate 2, the inner vibration portion 5 and the outer attachment portion 6 are
continuously formed, and further, the inner region portion 5 a and the outer peripheral region
portion 5 b are continuously formed in the vibration portion 5.
The vibrating portion 5 is formed of a part of the planar substrate 2 so that the entire area of the
inner region 5a and the outer peripheral region 5b has the same configuration (composition).
As described above, it is necessary to prepare a specially-designed substrate which has been
shaped or processed in advance so that the characteristics of the inner region portion and the
outer peripheral region portion differ in advance by using the vibrating portion 5 having the
same constitution (composition). There is no
The vibrating portion 5 may have a curved surface as well as a flat surface.
[0019]
The vibrating portion 5 of the substrate 2 abuts the exciter 3 on the inner region 5 a so that the
inner region 5 a is divided and vibrated by the output of the exciter 3.
The exciter 3 is selected from known ones (for example, the one shown in FIG. 2 of Japanese
Patent Application Laid-Open No. 2002-27588), and although a detailed view is omitted, a voice
coil wound around a bobbin and a voice coil are selected. When an acoustic reproduction signal
flows through the voice coil, the bobbin moves along with the voice coil according to the strength
of the voice reproduction signal, and the vibration of the vibrating portion in contact with the
output portion of the bobbin is caused. Play the sound. The exciter 3 is attached to the vibrating
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portion 5 using the fixture 7 (for example, the one shown in FIG. 4 of JP-A-2001-359188), so
that the output portion thereof is attached to the inner region 5a of the vibrating portion 5. Is
pressed so as to be pressed through the adjustment member 8 (see the diagram (C)) or without
(see the diagram (B)). The exciter 3 may be attached to the inner region 5 a of the vibrating unit
5 by bonding the output unit without using the fixture 7. As the adjustment member 8, a platelike material or the like is suitably selected from materials such as lightnium, wood, ceramic and
the like so as to obtain desired sound quality. The adjusting member 8 may be attached to the
inner region 5 a of the vibrating unit 5 with an adhesive or a pressure-sensitive adhesive.
[0020]
The vibrating portion 5 of the substrate 2 has a vibration adjusting layer 9 laminated on the
entire periphery of the outer peripheral region 5b (in the case of this embodiment, it makes one
turn along the front, rear, left and right). As the vibration control layer 9, a control agent layer
obtained by applying and curing a control agent (for example, epoxy resin, acrylic resin, urethane
resin, silicon resin, etc.) to the inner region 5b with a self-adhesive force, or Although not shown,
a plate material (for example, a synthetic resin plate such as expanded polystyrene or acrylic
plate or veneer plate etc.) or a tape (for example, an anti-vibration tape made of urethane foam
etc.) is bonded to the inner region 5b with an adhesive. The adjustment board layer formed is
selected. When selecting a modifier layer composed of a modifier, for example, the type of
additives contained in the modifier may be changed or bubbles may be contained to adjust to an
arbitrary elastic modulus.
[0021]
The vibration control layer 9 may have partially different characteristics in addition to uniform
characteristics throughout. In order to partially vary the characteristics of the vibration control
layer, the type and thickness of the control agent forming the control agent layer may be
partially different, or the type and thickness of the plate material forming the control plate layer
may be partial. Do different things. By making the characteristics of the vibration adjustment
layer 9 partially different from each other, the vibration unit 5 can finely adjust the vibration
control of the outer peripheral region 5b.
[0022]
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In the speaker device 1 of this example, in order to make it difficult to transmit vibrations to the
outside, the vibration adjustment region 10 including the outer peripheral region 5b and the
vibration adjustment layer 9 is made larger than the inner region 5a in terms of bending rigidity.
is there. By making the vibration adjustment region 10 larger than the inner region 5a with
respect to bending rigidity (elastic modulus multiplied by the cross sectional second moment),
the outer periphery from the inner region 5a driven by the exciter 3 The vibration transmitted to
the region 5b is difficult to pass through the outer peripheral region 5b, and it is difficult to
transmit the vibration from the outer peripheral region 5b to the outside (in the case of this
example, the attachment 6 and the vibration suppressor 4). However, in order to instantaneously
respond to the vibration of the exciter 3, it is also possible to make the bending rigidity larger in
the inner region 5 a than in the vibration adjustment region 10.
[0023]
The vibration suppression unit 4 is formed in a frame shape with a material such as wood, metal,
synthetic resin or the like that suppresses vibration, and is attached to the attachment portion 6
formed on the outermost side of the substrate 2 with an adhesive or pressure sensitive adhesive
It is laminated by fastening with a screw or a screw. The portion in which the vibration
suppression portion 4 is stacked on the attachment portion 6 is formed to have a bending rigidity
larger than that of the vibration control region 10 (a portion in which the vibration control layer
9 is stacked on the outer peripheral region 5 b of the vibrating portion 5). And are sized to
sufficiently suppress vibration. When the speaker device 1 of this example is attached or
incorporated to an external object (for example, a housing wall surface, a cabinet, etc.) via the
vibration suppression unit 4, the vibration unit 5 to the object via the attachment unit 6. Even if
vibration is to be transmitted, the vibration is suppressed by the vibration suppression unit 4 so
that transmission to the target becomes difficult, and the sound generation of the target can be
suppressed. As a result, even if the speaker device 1 is attached to or incorporated into the target
object, the main component is the sound emitted from the speaker device 1 while suppressing
the target object's sound generation, and the listener can hear clear sound. It will be. Further,
since the vibration transmission to the external object is small, noise can be reduced.
[0024]
In the speaker device 1, the vibrating portion 5 with which the exciter 3 abuts is divided and
vibrated by the drive of the exciter 3 to generate a sound. In this example, the inner region 5a of
the vibrating portion 5 is divided and vibrated by the drive of the exciter 3, and the outer
peripheral region 5b of the vibrating portion 5 is also divided and vibrated by the vibration
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transmitted from the inner region 5a. Pronounce it. At this time, since the speaker device 1 can
control the divisional vibration of the outer peripheral region 5b which is the outer side of the
exciter 3 by the vibration adjustment layer 9 laminated over the entire periphery of the outer
peripheral region 5b, it becomes the vibrating portion 5 of the substrate 2 It is not necessary to
use a special specification in which a portion is processed in advance, and it becomes possible to
control the vibration of the outer peripheral region 5b to make the frequency characteristic and
the sound quality in an optimum state. Furthermore, in the speaker device 1, the portion in which
the vibration suppression portion 4 is stacked on the attachment portion 6 is the portion of the
vibration adjustment region portion 10 (portion in which the vibration adjustment layer 9 is
stacked on the outer peripheral region portion 5 b of the vibration portion 5). Also, since the
vibration suppression unit 4 is stacked on the attachment unit 6, the vibration can be suppressed.
As a result, even if the speaker device 1 is attached to or incorporated into an external object (for
example, a housing wall surface, a cabinet or the like) using the vibration suppression unit 4, the
speaker device 1 suppresses the sound generation of the object. The sound it emits is the main
thing, and you can hear a clear sound to the listener. Further, since the vibration transmission to
the external object is small, noise can be reduced.
[0025]
Second Embodiment FIG. 2 shows a speaker apparatus according to a second embodiment of the
present invention, wherein FIG. 2 (A) is a partially broken back view, and FIG. 2 (B) is a crosssectional view. It is a top view.
[0026]
The difference between the speaker device 21 according to the present embodiment and the
speaker device 1 according to the first embodiment is that the outer peripheral region 5b of the
vibrating portion 5 is divided into a plurality of annular bands 5b-1, 5b-2 and 5b. The thickness
and / or the material of the vibration control layers 9-1 (9-2, 9-3) divided into -3 and laminated
in the respective annular zones 5b-1 (5b-2, 5b-3) The vibration characteristics are different.
[0027]
As the plan view shape of each annular zone 5b-1 (5b-2, 5b-3), the outer shape cut out in a
rectangular shape as shown in the drawing is rectangular, although not shown, the outer shape
cut out in a circular shape is a circle There is an oval or the like, or an outline that is hollowed
out in an elliptical shape.
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Each vibration adjusting area 10-1 (10-2) consisting of each annular band 5b-1 (5b-2, 5b-3) of
the outer peripheral area 5b and the vibration adjusting layer 9-1 (9-2, 9-3) , 10-3), by increasing
the bending rigidity stepwise or continuously toward the outside, the vibration passing through
the outer peripheral region 5b of the vibrating part 5 and transmitted outward Can be controlled
stepwise or continuously.
The speaker device 21 of this example is a vibration adjustment layer 9-1 (9-2, 9-3) laminated on
each annular band 5b-1 (5b-2, 5b-3) of the outer peripheral region 5a of the vibrating portion 5.
Since it is possible to appropriately change the vibration characteristics by selecting the
thickness and / or the material of the above, adjustment of the vibration control of the vibration
unit 5 can be facilitated.
[0028]
(Third Embodiment) FIG. 3 shows a working palate with a speaker according to a third
embodiment of the present invention, and FIG. 3 (A) is a partially broken back view, and FIG. 3
(B) is a diagram. It is the top view sectioned.
[0029]
The speaker with the speaker according to the present embodiment 31 integrally forms the
speaker device 1 (see FIG. 1) according to the first embodiment, and the lid surface portion 31a
that faces the room is the substrate 2 Is formed by the vibrating portion 5 of FIG.
The speaker-equipped work cleft 31 is attached to a work port 32 opened in the ceiling, wall or
floor of a room such as a bathroom or living room, and opens and closes the work port 32. The
work port 32 is used when performing installation work, inspection work, and the like. The
speaker device 1 is the same as that according to the first embodiment, and the same reference
numerals indicate the same components and the like, and the description thereof is omitted here.
[0030]
The working mouth lid 31 with a speaker according to the present embodiment includes an outer
edge portion 33 continuously extended from the substrate 2 of the speaker device 1, and an
annular groove portion 33a formed in the outer edge portion 33 is opened in the front direction.
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. By providing the annular groove 33a at the outer edge 33 and enhancing the rigidity, the
speaker-equipped work palate 31 is configured such that the vibrator 5 is not deformed when
mounted on the work port 32, so that a predetermined frequency characteristic can be secured.
It is In the case of this example, the substrate 2 including the vibrating portion 5 and the outer
edge portion 33 are formed of a metal plate or a synthetic resin plate. The outer edge portion 33
is reinforced by attaching a reinforcing material 34 to the outer side of the back surface, and is
filled with a vibration suppressing material 35 such as butyl rubber between the attaching
portion 6 of the speaker device 1 and the reinforcing material 34.
[0031]
Even if the lid surface portion 31a formed by the vibrating portion 5 by the speaker device 1 is
divided and vibrated and the sound is released by the speaker device 1 driving the exciter 3, the
speaker equipped with the work palate 31 of the inner region portion 5a of the vibrating portion
(lid surface) 5 Since it is difficult for vibration to transmit the outside (the side away from the
inner region 5a) of the outer peripheral region 5b and the attachment portion 6, the lid transmits
the work opening 32 by suppressing the vibration transmitted around the work opening 32. It is
possible to eliminate or reduce the sound generation from the mounting object (for example, a
ceiling or a housing wall). As a result, the speaker equipped with the work palate 31 suppresses
the sound generation of the lid attached object mainly, and the sound emitted from the speaker
device 1 becomes the main, so that the listener can hear clear sound. Further, since the vibration
transmission to the lid attachment target is small, the noise can be reduced.
[0032]
(Fourth Embodiment) FIG. 4 shows a working palate with a speaker according to a fourth
embodiment of the present invention, and FIG. 4 (A) is a partially broken back view, and FIG. 4
(B) is a rear view. It is the top view sectioned.
[0033]
The speaker equipped work speaker 41 according to the present embodiment is integrally
formed with the speaker device 21 (see FIG. 2) according to the second embodiment, and the
cover surface 41 a is formed by the vibrating portion 5.
The speaker equipped with the work palate 41 is attached to a work port 32 opened on a ceiling,
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wall or floor of a bathroom or living room, and opens and closes the work port 32. The speaker
device 21 is the same as that according to the second embodiment, and the same reference
numerals indicate the same components and the like, and the description thereof is omitted here.
[0034]
The speaker-equipped work palate 41 of this example has an outer edge portion 33 continuously
extended from the substrate 2 of the speaker device 21, and an annular groove portion 33 a
formed in the outer edge portion 33 is opened downward. The outer edge portion 33 is
reinforced by attaching a reinforcing material 34 to the outer side of the back surface, and is
filled with a vibration suppressing material 35 such as butyl rubber between the attaching
portion 6 of the speaker device 21 and the reinforcing material 34. The outer edge portion 33 is
the same as that of the third embodiment, and the description thereof is omitted here.
[0035]
Even if the lid surface 41a formed by the vibrating portion 5 by the speaker device 21 vibrates in
a split manner and emits a sound when the speaker device 21 drives the exciter 3, the vibration
of the inner area 5a of the vibrating portion (lid surface) 5 Since it is difficult to transmit the
outer side (the side away from the inner area 5a) of the outer peripheral area 5b and the
attaching part 6, the vibration transmitted to the periphery of the work opening 32 is suppressed
to form a lid attachment forming the work opening 32. It is possible to eliminate or reduce the
sound generation from the object (for example, a ceiling or a housing wall). As a result, the
speaker equipped with the work palate 31 suppresses the sound generation of the lid attached
object mainly, and the sound emitted from the speaker device 21 becomes the main, so that the
listener can hear clear sound. Further, since the vibration transmission to the lid attachment
target is small, the noise can be reduced.
[0036]
Fifth Embodiment FIG. 5 is a cross-sectional side view showing a part of a wall panel with a
speaker according to a fifth embodiment of the present invention with the middle being omitted.
[0037]
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The speaker-equipped wall panel 51 according to the present embodiment integrally forms the
speaker device 21 (see FIG. 2) according to the second embodiment, and the panel surface 51 a is
formed by the vibrating portion 5 of the speaker device 21. It is
The wall panel 51 forms a wall, a ceiling or a floor such as a bathroom, a washroom, a kitchen or
a living room. The speaker device 21 is the same as that according to the second embodiment,
and the same reference numerals indicate the same components and the like, and the description
thereof is omitted here.
[0038]
The speaker attached panel 51 in this example is composed of a surface material 52 made of a
painted steel plate, a stainless steel plate, a synthetic resin plate or the like, and a reinforcing
material 53 with a framework or the like for reinforcing the back surface of the surface material
53. In the surface member 52, a part of the appropriate place is the vibrating portion 5 and the
attaching portion 6 forming the speaker device 21, and the vibrating portion 5 and the attaching
portion 6 are integrally formed.
[0039]
Of course, the panel 51 with a speaker can be formed like a frame by arranging it on the back
side as shown by a two-dot chain line in the drawing, in addition to arranging the vibration
suppressing portion 4 constituting the speaker device 21 on the back side. It is. Moreover, the
panel 51 with a speaker can replace the speaker apparatus 21 with the speaker apparatus 1
(refer FIG. 1) which concerns on 1st Embodiment.
[0040]
The speaker-equipped wall panel 51 vibrates the inner region 5a of the vibrating portion (lid
surface) 5 even if the lid surface 51a formed by the vibrating portion 5 by the driving of the
exciter 3 splits and vibrates. Since it is difficult to transmit the outside (the side away from the
inner region 5a) of the outer peripheral region 5b and the attachment portion 6, the vibration
transmitted to the portion further outside the attachment portion 6 in the surface member 52 is
suppressed. Sound generation from locations other than the speaker device 21 can be eliminated
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or reduced. As a result, the speaker-equipped wall panel 51 mainly suppresses the sound
generation from a place other than the speaker device 21 and the sound emitted from the
speaker device 21 becomes the main, and the listener can hear clear sound.
[0041]
The speaker apparatus which concerns on the 1st Embodiment of this invention is shown, The
figure (A) is the rear view which fractured partially, the figure (B) is the top view sectioned, and
the figure (C) is a deformation ¦ transformation FIG. 2 is a cross-sectional plan view of an
example. The speaker apparatus of the 2nd Embodiment of this invention is shown, The figure
(A) is the rear view which fractured partially, The figure (B) is the top view which carried out the
cross section. FIG. 10 shows a speaker equipped working palate according to a third embodiment
of the present invention, in which (A) is a partially broken rear view, and (B) is a cross-sectional
plan view. FIG. The speaker with a speaker of the 4th Embodiment of this invention is shown, The
figure (A) is the rear view which fractured partially, The figure (B) is the top view sectioned. It is
the cross section side view which carries out the middle omission and shows a part of wall panel
with a speaker of the 5th Embodiment of this invention.
Explanation of sign
[0042]
DESCRIPTION OF SYMBOLS 1 ... Speaker apparatus, 3 ... Exciter, 5 ... Vibration part, 5a ... Inner
area part, 5b ... Outer peripheral area part, 5b-1, 5b-2, 5b-3 ... Annular zone, 6 ... Attachment part,
9 ... Vibration part Adjustment layer, 9-1, 9-2, 9-3 ... vibration adjustment layer, 21 ... speaker
device, 31 ... working mouth lid with speaker, 31 a ... lid surface portion, 41 ... working mouth lid
with speaker, 41 a ... lid surface, 51 ... wall panel with speaker, 51a ... surface of panel
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