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JP2004056564

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2004056564
An easy-to-use in-vehicle panel speaker device is provided which is not limited in size and shape
of a diaphragm and a sound emitting surface and is not restricted in shape and size of an
installation place. SOLUTION: A diaphragm 110 is fixed in direct contact with the back surface of
a vehicle interior material, and a driver unit 120 which vibrates according to an acoustoelectric
signal is fixed to the back surface of the diaphragm 110, thereby securing acoustic performance.
The interior material can be used without changing the material and shape of the interior
material, and there is no need to change the interior material even if there are differences in the
size, shape and number of speakers due to differences in car specifications. Even if there is a
temperature difference between the interior and exterior of the interior material, air movement
of the interior and exterior of the interior material does not occur, so the surroundings of the
speaker are not contaminated. [Selected figure] Figure 1
Automotive panel type speaker device
The present invention relates to an improvement of an on-vehicle panel-type speaker device, and
more particularly to an on-vehicle panel-type speaker device that is inexpensive, has good
attachment performance, and is excellent in sound emission characteristics. . 2. Description of the
Related Art In the interior of a vehicle, speaker devices are installed at various sites as part of a
vehicle-mounted audio system such as an audio amplifier, a CD, and an MD. The following is
known as such a panel speaker apparatus for vehicle mounting (on-vehicle). (1) Panel speaker
device described in JP-A-11-215579 (2) Panel speaker device described in JP-A-2000-197185
(3) Panel speaker described in JP-A-2001-313993 Apparatus First, the on-vehicle panel speaker
apparatus described in (1) JP-A-11-215579 will be described. The on-vehicle panel speaker
device is a panel-type speaker device in which a driver unit is provided on the back surface of a
mirror plate of a rearview mirror assembly so that the mirror surface is a sound emitting surface.
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More specifically, as shown in FIG. 7, in the panel type speaker device 10, a mirror plate 13
consisting of a transparent substrate 11 and a reflective layer 12 is used as a sound emitting
surface, and the sound emitting surface and the mirror cover 14 The voice coil 15 mechanically
connected to the sound emission surface between the two, and the magnetic circuit 16 for
driving the voice coil 15 are incorporated. However, the disadvantages of the panel type speaker
device 10 are as follows. (1) Since the mirror plate 13 consisting of the transparent substrate 11
and the reflective layer 12 is directly divided and vibrated, the acoustic performance and the
acoustic characteristics are determined by the mirror plate 13. (2) Due to the nature of utilizing
the mirror plate 13 of the room mirror, the size and shape of the diaphragm and the sound
emitting surface are limited. Therefore, it is not possible to exhibit the optimum acoustic
characteristics as an on-vehicle speaker device. Subsequently, (2) an on-vehicle panel speaker
device described in JP-A-2000-197185 will be described. The on-vehicle panel speaker device is
a panel type speaker device in which a diaphragm and a driver unit are provided in a sun visor,
and a sound hole is opened for passing a sound through a lid on the surface of the sun visor.
More specifically, as shown in FIG. 8, in the panel type speaker device 20, the diaphragm 25 is
attached to the inside of the sun visor main body 23 composed of the frame 21 and the lid 22 via
the support frame 24; By driving a magnetic circuit 29 composed of a yoke and a permanent
magnet provided on the diaphragm 25, it has a structure for emitting sound.
However, the disadvantages of the panel-type speaker device 20 are as follows. (1) A protrusion
21a for accommodating the driver unit is formed on the back of the sun visor. {Circle over (2)}
There are many sound holes 22a on the surface of the sun visor, and this portion is easily soiled,
and once soiled, it is difficult to remove the soiling, which is inconvenient. Further, due to the
nature of attaching to the sun visor, the size and shape of the diaphragm and the sound emitting
surface are limited as in the case of using the mirror plate of the above-mentioned rearview
mirror, and it is optimum as a car speaker device It is not possible to exhibit acoustic
characteristics. Further, (3) an on-vehicle panel speaker device described in Japanese Patent
Application Laid-Open No. 2001-133993 will be described. As shown in FIG. 9, in the vehiclemounted panel speaker device 30, the diaphragm 31 and the driver unit 32 are provided on the
lower surface of the ceiling member 39, the grille 33 is provided on the lower surface of the
diaphragm 31, and the grille 33 is a speed nut It is a panel type speaker apparatus attached to
the ceiling material 39 while being engaged with 34 (refer to the arrow in FIG. 9). The
disadvantages of the panel-type speaker device 30 are as follows. {Circle over (1)} In order to
attach it to the lower surface of the ceiling material, it is necessary to have a grille 33 and to
form in the ceiling material 39 a hole 39a for inserting a driver unit in advance. {Circle over (2)}
The number of parts (materials) to be configured does not decrease, and the request for
reduction in the number of parts can not be answered. Also, the grille 33 must be provided and
attached to the surface of the lining (ceiling). Therefore, the installation place, the shape, and the
size are limited, and it can be said that the degree of freedom of attachment is small. On the other
hand, there are the following as prior art of the diaphragm used for the vehicle-mounted panel
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speaker device. First, a diaphragm described in Japanese Patent Application Laid-Open No. 200244782 “diaphragm for electro-acoustic transducer” can be mentioned. The publication
discloses that a diaphragm of a foam structure is obtained by laminating a low density
polyethylene sheet, a paper material, and a high density polyethylene sheet, and using moisture
in the paper material to foam the low density polyethylene sheet. It is done. However, in the
diaphragm disclosed herein, the core material is a paper material, and a layer obtained by
foaming a low density polyethylene sheet on the front and back and a high density polyethylene
sheet are used. In addition, the rigidity is relatively low and the mechanical strength is low.
Subsequently, a diaphragm disclosed in Japanese Patent Application Laid-Open No. 2001133993 “diaphragm of thin flat plate speaker” can be mentioned. In this publication, the
diaphragm is not damaged by the stiffening material containing glass fiber on the upper and
lower sides (front and back) of the core material of the foamed polyurethane layer and the hot
melt film on the upper and lower sides (front and back) Thickness of a polyester non-woven
fabric, aluminum, etc. (due to the need to protect the surface of the diaphragm as a surface
material), which has high hardness (due to the need to bond a transducer or drive) A laminate of
2.0 mm to 3.0 mm is disclosed. However, the diaphragm disclosed herein has many components
and is expensive. As described above, the diaphragm itself of the in-vehicle panel speaker device
has problems in terms of cost and mechanical strength as well as the conventional diaphragm. It
is an object of the present invention to provide an inexpensive car panel speaker apparatus in
which the size and shape of the diaphragm and the sound emitting surface are not limited, and
the shape and size of the installation place are not restricted. It is in. [Means for Solving the
Problems] In order to solve the above-mentioned problems, the vehicle-mounted panel type
speaker device according to the present invention fixes the diaphragm directly in contact with
the back surface of the vehicle interior material, and It is characterized in that a driver unit that
vibrates according to the acoustoelectric signal is fixed to the back surface of the diaphragm. The
sound emission surface is the surface of the interior material, and depending on the material and
structure (shape) of the interior material, the efficiency may be slightly reduced depending on the
structure and shape, but the diaphragm and driver unit provided on the back surface of the
interior material The sound performance can be secured by tuning. Further, since the interior
material is not directly divided and vibrated, it can be used without changing the material and
shape of the interior material, and it can be easily implemented as an on-vehicle panel type
speaker device. Furthermore, since the diaphragm and driver unit are on the back of the interior
material, and there is no need to provide a grille on the surface of the interior material or sound
hole penetrating the interior material, it is necessary to Even if there is a difference in size, shape
and number, it is not necessary to change the interior material. In addition, even if a temperature
difference occurs between the inside and the outside of the interior material due to the outside
air temperature and the air conditioning, air movement inside and outside the interior material
does not occur, and therefore, there is also an effect that the speaker surroundings are not soiled.
Furthermore, there is also an effect that the indoor space of the vehicle can be used effectively.
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According to a second aspect of the present invention, there is provided the in-vehicle panel type
speaker device according to the first aspect, wherein the diaphragm is made of low-foam
polyethylene having a closed cell hole. It is characterized in that it is a composite laminate of
aluminum and resin in which a core material and a face material made of a thin metal plate of
aluminum or aluminum alloy are bonded and fixed to the front and back of the core material.
In addition to the function possessed by claim 1, it has the performance required for the
diaphragm to generate the divided vibration, and it can be easily obtained compared with the one
which is light weight and high rigidity by the honeycomb etc. Can be provided to According to a
third aspect of the present invention, there is provided the in-vehicle panel type speaker device
according to the first aspect, wherein the diaphragm is made of low expansion polyethylene
having a closed cell hole. It is characterized in that it is a composite laminate of stainless steel
and resin in which a core material and a face material consisting of a thin metal plate of stainless
steel are joined and fixed to the front and back of the core material. As in the second aspect of
the invention, in addition to the action of the first aspect of the invention, it has the performance
required of the diaphragm for generating the divisional vibration, and is lightweight and highly
rigid by the honeycomb etc. It can be easily obtained compared to things, and can be provided
inexpensively. BEST MODE FOR CARRYING OUT THE INVENTION An on-vehicle panel type
speaker device according to an embodiment of the present invention will be described below
with reference to the drawings. As shown in the overall configuration sectional view of FIG. 1, the
vehicle-mounted panel type speaker device 1 according to one embodiment of the present
invention is a back surface of a head lining 100 which is a flat vehicle interior material (a roof
panel of a vehicle The vibration plate 110 is directly attached to the surface (101 side) and
includes a vibration plate 110 and a vibration applying portion (driver unit) 120 for dividing and
vibrating the vibration plate 110, and the vibration plate 110 is vibrated by the vibration
applying portion 120. The head lining 100 to which is attached is made to emit sound as a sound
emission surface. The head lining 100 utilizes a so-called ceiling lining conventionally attached to
the ceiling of a vehicle. This head lining 100 is attached under the roof of the vehicle by
sandwiching the end between the roof side rail 102 attached to the side of the roof panel 101
and the garnish 103, as is apparent from FIG. . In addition, the head lining 100 is fixed to the
roof side rail 102 or a roof bow (not shown) with a screw or a clip by being locked under the roof
of the vehicle. The diaphragm 110, which will be described in detail later, is made of a laminate
of a core made of low-foam polyethylene and a facing made of an aluminum alloy sheet, and is a
headlining 100 to be attached in this embodiment. And the entire surface of the diaphragm 110
is adhered to the head lining 100.
That is, the diaphragm 110 is pre-bent according to the surface shape of the head lining 100.
The in-vehicle panel type speaker device 1 according to the present embodiment is a DM
(Distributed Mode) type panel speaker (vibration mode) developed by New Transducer Limited
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(NXT (registered trademark)) company in the UK System's flat speaker) technology is applied. In
such a panel type speaker, flat frequency characteristics are realized in the middle and high
frequency ranges and fine divided vibration occurs in the diaphragm, so a large radiation area is
obtained, and the sound pressure level is maintained even if it is separated from the diaphragm. ,
Enough energy can be obtained. On the other hand, the operation of the vibration applying unit
120 and the operation of the diaphragm 110 are known, and, for example, JP-A-2001-359188,
JP-A-2002-27588, and JP-A-11-220785. It is described in. The diaphragm 110 has a total
thickness of 2.0 mm, for example, of aluminum, polyethylene and aluminum resin composite
laminate “Litnium” (trademark) manufactured by Sankyo Yunite Industries Co., Ltd. In this
case, the aluminum thickness is 120μ and the specific gravity is 0.86. And this product has
mechanical characteristics of light weight and high rigidity. Also, the core material of the
diaphragm is low-foam polyethylene having closed cell holes, maintaining high strength on its
front and back, no through holes on the front and back, and aluminum face material having good
adhesion is adhered It is a sandwich structure. Further, the vibration applying unit 120 is
adhesively fixed to the diaphragm 110. Hereinafter, the structure of the in-vehicle panel type
speaker device 1 will be described in more detail based on the drawings. As shown in FIG. 2, the
on-vehicle panel type speaker device 1 shown in FIG. 1 has a low foam polyethylene foam with
closed cells as a core material 111, and the front and back of the core material 111 is smooth
and extremely thin of aluminum. Diaphragm 110 is a laminated composite plate of aluminum and
closed-cell low-foamed polyethylene with a total thickness of 1.5 mm to 6.0 mm of a sandwichlike structure in which plate-like face materials 112 and 113 are bonded (bonded) with an
adhesive. A vibration application unit 120 for vibrating the vibration plate 110 according to the
acoustoelectric signal is directly adhered to one side of the vibration plate 110 by an adhesive
such as a double-sided adhesive tape or the like. There is. As for the diaphragm 110, as shown in
FIG. 3, adhesion is made of aluminum, polyethylene, aluminum and resin laminated composite
plate of light aluminum (registered trademark) from one side made by Sankyo Yunite Industrial
Co., Ltd. And a total thickness of 1.5 mm, 2.0 mm, 3.0 mm, 4.0 mm or 6.0 mm including
aluminum, polyethylene and aluminum.
This Litnium (registered trademark) uses low-foamed polyethylene having closed cell holes as the
core material 111, and the front and back of the core material 111 is sandwiched between the
surface materials 112 and 113 of aluminum thin metal sheets maintaining high strength. It has
high rigidity by becoming a sandwich structure (laminated composite structure) bonded by
Reference numerals 116 and 117 shown in FIG. 3 denote adhesive layers which bond the core
material 111 and the aluminum surface materials 112 and 113 on the front and back sides.
Then, in FIG. 3, the aluminum face material 113 is adhered to the head lining 100 via the
adhesive layer 118. In addition, low foaming polyethylene having closed cell holes is used for the
core material 111, which is lightweight. (As a specific example, specific gravity is 0.80 to 1.30 as
described later. Also, the sandwich structure in which closed cell low expansion polyethylene is
used as the core material 111 and the front and back are sandwiched between the surface
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materials 112 and 113 of the aluminum thin metal plate is bonded to suppress the corrugation
that tends to occur in the metal thin plate. The polyethylene of 111 gives a flat and smooth
(smoothed) surface due to low foaming and closed cell. As a result, even when the entire
diaphragm 110 is fixed to the head lining 100, no waving or crinkling occurs on the diaphragm
fixing surface of the head lining 100. The aluminum facings 112 and 113 on the front and back
sides may be used as they are, or may be anodized on their surfaces for corrosion resistance.
Here, the relationships among the total thickness, aluminum thickness, and specific gravity with
respect to Lightnium (registered trademark) are as follows. <Img class = "EMIRef" id =
"197766027-00003" /> As a modification of diaphragm 110 in the above-described panel type
speaker apparatus for a vehicle, low-foam polyethylene shown in FIG. 4 is used. Alternatively, a
diaphragm 210 may be used which is a laminate of a core material and a face plate made of
stainless steel sheet metal. More specifically, as shown in FIG. 4, the diaphragm 210 as a
modification has a core material 211 made of low-foam polyethylene of a closed cell, and
stainless steel smooth and polar on the front and back of the core material 211. A laminated
composite plate of stainless steel and closed-cell low-foam polyethylene with a total thickness of
1.2 mm to 4.0 mm of a sandwich structure in which thin flat plate-like surface materials 212 and
213 are bonded (bonded) with an adhesive The vibration applying unit 120 according to the
above-described embodiment is directly fixed to one side of the diaphragm 210 through an
adhesive such as a double-sided adhesive tape.
The configuration of the diaphragm 210 will be described in more detail. As shown in FIG. 4,
Sasulite is a laminated composite plate of stainless steel, polyethylene, stainless steel and resin
from one side made by Sankyo Yunite Industrial Co., Ltd. Among (registered trademark), those
having an adhesive and a total thickness of stainless steel, polyethylene, and stainless steel
combined are 1.2 mm, 1.5 mm, 2.0 mm, 3.0 mm, and 4.0 mm. This susulight (registered
trademark) uses low-foamed polyethylene having closed cell holes as a core material 211, and
the front and back of the core material 211 is a surface material 212, 213 of a stainless steel thin
metal plate which maintains high strength. By providing a sandwich structure (laminated
composite structure) which is sandwiched and bonded, high rigidity is obtained. Reference
numerals 214 and 215 shown in FIG. 4 denote adhesive layers which bond the core 211 and
stainless steel facings 212 and 213 on the front and back sides. Further, in FIG. 4, a stainless
steel face material 213 is adhered to the head lining 100 via the adhesive layer 216. In addition,
low foaming polyethylene having closed cell holes is used for the core material 211, which is
lightweight. (Specific examples will be specific gravity 1.03 to 1.95 as described later. In addition,
the sandwich structure in which closed cell low expansion polyethylene is used as core material
211 and the front and back are sandwiched between the surface materials 212 and 213 of
stainless steel thin metal plates is bonded, thereby suppressing waviness that tends to occur in
the thin metal sheets. The polyethylene of material 211 provides a flat and smooth (smoothed)
surface due to low foaming and closed cell. Therefore, when one side of the diaphragm 210 is
fixed to the head lining 100, the adhesion of the head lining 100 is performed, as in the case of
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the diaphragm 110 made of the aluminum facing and the low foaming polyethylene core
described above. There is no waving or wrinkling on the surface. The relationship between the
total thickness and the specific gravity of Suslight (registered trademark) is as follows. [Image 2]
<img class = "EMIRef" id = "197766027-00004" /> On the other hand, the vibration applying
unit 120 used to drive the diaphragm 110 of the in-vehicle panel type speaker device 1
according to the present invention A known technology is applied, and for example, Japanese
Patent Application Laid-Open No. 2001-359188 "Drive unit and panel speaker provided with the
same", Japanese Patent Application Laid-open No. 2002-27588 "Panel type speaker system" or
Japanese Patent Application Laid-Open No. 11- Similarly to the panel-type speaker device
described in "Panel-type speaker device", a panel-type speaker based on bending wave theory
that drives the diaphragm 110 by the driver unit corresponding to the vibration applying unit
120 to perform output reproduction The device has a basic configuration.
Specifically, as described above, the technology of the panel speaker of DM (Distributed Mode)
system is applied. That is, the driver unit corresponding to the vibration applying unit 120 (FIG. 1
and FIG. 2) causes the diaphragm 110 to generate a partial bending operation by the abovementioned vibration to perform sound emission. Here, the diaphragm 110 vibrated by the known
driver unit is capable of reproducing and outputting good sound quality even in a low frequency
band since the outer peripheral portion freely vibrates in an unconstrained state. Subsequently, a
specific configuration of the above-described vibration applying unit 120 will be described. The
vibration applying unit 120 is composed of a housing 125 (see FIGS. 2 and 5) made of aluminum
and a driver unit main body housed inside. The housing 125, as shown in FIG. 5, has a box shape
with one surface (the lower surface in the figure) open, and the other surface (the bottom plate
125a, the upper surface in the figure) in a position biased to one side. A circular driver unit
mounting hole 125m is formed, and driver unit mounting screw holes 125n are formed at four
positions around the circular driver unit mounting hole 125m. Thus, the reason why the driver
unit mounting hole 125m is formed to be biased at the bottom of the housing is to prevent the
housing 125 from resonating by biasing the driver unit itself to one side of the housing 125 and
attaching it. It is. On the other hand, at each edge of the housing opening, a cantilever-shaped
mounting flange 124 connected at only one end of each edge is formed extending along each
edge. As shown in FIG. 2, in the vibration applying unit 120, a bobbin 121 fixedly adhered
(adhered fixed) to the diaphragm 110, a voice coil 122 wound around the bobbin 121, and a
voice coil 122 are inserted. A magnetic gap 123, a housing 125 fixed (adhesively fixed) to the
diaphragm 110 via a mounting flange 124, a yoke 127 fixed to a bottom plate 125a of the
housing 125 via a stainless steel damper 126, and a center of the yoke 127 And a magnet 129
fixed to the periphery of the yoke 127. As shown in FIG. The resin frame 132 is attached to the
magnet 129 via the yoke 131, one end of the damper 133 is attached to the resin frame 132,
and the other end is attached to the bobbin 121.
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A magnetic gap 123 is formed by the magnet 129, the yokes 127 and 131, and the center piece
128. Further, the damper 133 vibratably connects the bobbin 121 and the resin frame 132, and
enables the vibration of the bobbin 121 on which the voice coil 122 is wound in the magnetic
gap 123. It is over. It plays a role of pivotally connecting with the center piece 128. Reference
numeral 134 denotes a jack which can be connected to an on-vehicle audio device such as a CD
or MD (not shown). Reference numeral 134a denotes a lead wire wired between the jack 134 and
the voice coil 122. Reference numeral 125 c denotes a screw and a nut for mounting and fixing
the bottom plate 125 a of the housing 125 and the damper 126. Reference numeral 121 b
denotes a ring of resin that reinforces the flange portion 121 a of the bobbin 121 extended for
adhesively fixing the bobbin 121 to the diaphragm 110. With the above configuration, by
applying an electrical acoustic signal to the voice coil 122, the bobbin 121 on which the voice
coil 122 is wound vibrates according to the electrical acoustic signal, and is bonded and fixed to
the bobbin 121. The vibrating diaphragm 110 vibrates. Then, the head lining 100 to which the
vibration plate 110 is adhered vibrates and emits sound to the entire cabin of the vehicle. The
housing 125 and the diaphragm 110 are connected to each other by bonding a cantilever-shaped
mounting flange 124 formed on each edge 125 b of the opening of the housing 125 to the
diaphragm 110. Thus, the vibration applying unit 120 is supported by the diaphragm 110. Since
the slit 124a is provided between the mounting flange 124 and the housing 125 as described
above, and this portion forms a slight gap in the normal direction of the diaphragm 110, the
vibration of the diaphragm 110 can be detected by the mounting flange A variation of 124 is to
allow. Instead of the mounting flange 124, the diaphragm 110 and the housing 125 may be
mounted via an elastic body made of foam rubber. Further, instead of the above-described
vibration applying unit (driver unit) 120, a driver unit shown in FIG. 6 may be used. The driver
unit is an internal magnet type driver unit, and a C-shaped yoke 151 having a square cross
section is attached to a housing having the same shape and the same material as the above
housing 125 via a stainless steel damper 152.
The center piece 154 is attached to the yoke 151 via the magnet 153. On the other hand, the
bobbin 161 is directly adhered to the diaphragm 110, and the voice coil 162 is wound around
the bobbin 161. The bobbin 161 and the yoke 151 are connected to be relatively movable within
a predetermined range via the resin material 163 and the damper 164. In such an internal
magnetic type driver unit as well as the driver unit described above, by applying an electric
acoustic signal to the voice coil 162, the bobbin 161 on which the voice coil 162 is wound
vibrates according to the electric acoustic signal. The diaphragm 110 adhesively fixed to and
integrated with the bobbin 161 vibrates. Then, the head lining 100 to which the vibration plate
110 is adhered vibrates and emits sound to the entire cabin of the vehicle. As is apparent from
the above configuration, in the in-vehicle panel type speaker device 1, since the front and back of
the diaphragm 110 (210) is aluminum (stainless steel), the core material 111 (211) Even if
foamed polyethylene is used, there is no through hole in the front and back direction, and the
surface is smooth, so it has the property of being easy to adhere to the back of the vehicle
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interior material and difficult to peel off. In addition, the independent air bubble holes of the core
member 111 (211) are not clogged with dust or the like in the air by clogging with air dust or
the like, so that deterioration of the speaker performance is prevented and rigidity is high. It has
good adhesion and can be attached firmly to the vibration applying unit 120. In addition, when
the diaphragm 110 (210) is attached to the interior material of the vehicle as described above, it
can be easily attached by adhesion, so it is possible to provide an on-vehicle panel type speaker
device easy to assemble. In addition, since the core material 111 (211) is a low-foam
polyethylene of closed cells, it has independent air holes, is low density and sparse, light in
weight and high in rigidity, A flat, smooth surface is formed by suppressing the corrugation of
stainless steel. Therefore, the diaphragm 110 (210) as a whole is a structure having a low
density, light weight, high bending and rigidity, and mechanical properties such as no through
holes in the front and back direction, thereby providing high performance. In addition, since a
laminated composite plate of aluminum (stainless steel) and low-foam polyethylene is used for
the diaphragm 110 (210), the outer wall, inner wall, ceiling partition of a building, door,
signboard, or lorry It is a widely used material such as cold storage room, gate, wing, etc. It is
easy to obtain the material and it is inexpensive.
Further, the size and the shape of the diaphragm and the sound emitting surface are not limited,
and the acoustic characteristic optimum as the on-vehicle speaker device can be exhibited.
Further, there is no restriction on the installation place, the shape or the size which is a drawback
found in the conventional in-vehicle panel type speaker device, and it can be said that the degree
of freedom of attachment is large. In the above embodiment, the ceiling lining is a panel type
speaker, but unlike the above embodiment, the door trim such as a hinge door, a slide door, a
back door, a body side trim, a pillar garnish, an instrument panel It may be a type speaker. As a
requirement to be used as an interior material of a vehicle, it can be mentioned that there is no
projection on the indoor side of the vehicle in the mounted state. And since the vehicle-mounted
panel type speaker apparatus concerning this invention is mounted | worn with the vehicle body
panel side of interior material, the protrusion of a speaker arises in the indoor side of a vehicle in
the state which attached interior material to the vehicle There is nothing to do. Therefore, a metal
plate such as aluminum or stainless steel excellent in sound emission effect can be used for the
diaphragm of the in-vehicle panel type speaker device. Further, in the above-described
embodiment, the vibration applying unit and the diaphragm are fixed by adhesion. This can be
said to be appropriate for such a fixing method because gravity acts to vertically load the
diaphragm in the present embodiment. However, when gravity is loaded parallel to the
diaphragm, it is preferable to use screws, clips, etc. in combination with mechanical fastening or
bonding. On the other hand, the diaphragm is fixed to the outer panel of a car body panel or a
luggage compartment panel such as a heat insulating car, and the outer panel is used as a panel
type speaker to emit sound to the outside of the vehicle (speaker outside the vehicle) It may be
used for the purpose or announcement. As described above, in the in-vehicle panel-type speaker
device according to the present invention, the sound emission surface is the surface of the
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interior material, and depending on the material and structure (shape) of the interior material,
attenuation occurs. There is a possibility that the efficiency is lowered, but the acoustic
performance can be secured by tuning the diaphragm and the driver unit provided on the back of
the interior material. Further, since the interior material is not directly divided and vibrated, the
material and shape of the interior material can be used without changing it from the prior art,
and can be implemented easily. Furthermore, since the diaphragm and driver unit are on the
back of the interior material, and there is no need to provide a grille on the surface of the interior
material or the sound hole penetrating the interior material, the speaker There is no need to
change the interior materials even if there are differences in size, shape and number.
Further, even if a temperature difference occurs between the inside and the outside of the
interior material due to the outside air temperature and air conditioning, air movement inside
and outside the interior material does not occur, so the surroundings of the speaker are not
contaminated. Furthermore, there is also an effect that the space inside the vehicle can be used
effectively. The vehicle-mounted panel type speaker device according to claim 2 of the present
invention and the vehicle-mounted panel type speaker device according to claim 3 have the same
effects as those of the vehicle-mounted panel type speaker device according to claim 1 of the
present invention. In addition to the above, the diaphragm has the performance required for the
vibration plate that generates the division vibration, and can be easily obtained and provided at
low cost as compared with the one that is made light and highly rigid by a honeycomb or the like.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a vehiclemounted panel-type speaker device according to an embodiment of the present invention
attached to a roof portion of a vehicle. FIG. 2 is a cross-sectional view of an in-vehicle panel-type
speaker device according to an embodiment of the present invention. 3 is a cross-sectional
perspective view of a diaphragm used in the in-vehicle panel type speaker device of FIG. 1; 4 is a
cross-sectional perspective view of a modification of the diaphragm used in the in-vehicle panel
type speaker device of FIG. 1; 5 is a perspective view of a housing of a vibration applying unit
used in the in-vehicle panel type speaker device of FIG. 1; 6 is a cross-sectional view of a
modification of the vibration applying unit used in the in-vehicle panel type speaker device of
FIG. 1; FIG. 7 is a cross-sectional view showing an example of a conventional in-vehicle panel type
speaker device. FIG. 8 is a cross-sectional view showing an example of a conventional in-vehicle
panel type speaker device different from FIG. 7; FIG. 9 is a cross-sectional view showing an
example of a conventional in-vehicle panel type speaker device different from FIGS. 7 and 8;
[Description of the code] 1 panel type speaker device for vehicle 10 panel type speaker device 11
transparent substrate 12 reflective layer 13 mirror plate 14 mirror cover 15 voice coil 16
magnetic circuit 20 panel type speaker device 21 frame 22 lid 22a sound hole 23 sun visor Main
body 24 Support frame 25 Diaphragm 29 Magnetic circuit 30 Automotive panel speaker device
31 Diaphragm 32 Driver unit 33 Grille 34 Speed nut 39 Ceiling material 39a Hole 100 Head
lining 101 Roof panel 102 Roof side rail 103 garnish 110 Diaphragm 111 Core material 112,
113 face material 116, 117 adhesive layer 118 adhesive layer 120 Motion application unit 121
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Bobbin 121a Flange 121b Diaphragm 122 Voice coil 123 Magnetic gap 124 Mounting flange
124a Slit 125 Housing 125a Bottom plate 125b Edge 125c Ring 125m Mounting hole 125n
Screw hole 126 Damper 127 Yoke 128 Center piece 129 Magnet 131 yoke 132 resin frame 133
damper 134 jack 134a lead wire 151 yoke 152 damper 153 magnet 154 center piece 161
bobbin 162 voice coil 163 resin material 164 damper 210 diaphragm 211 core material 212,
213 surface material 214, 215 adhesive layer
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