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DESCRIPTION JPH0497700

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DESCRIPTION JPH0497700
[0001]
[Industrial field of application] The present invention uses a vehicle ceiling speaker mounted on
the ceiling of a vehicle such as a car, a bus, a truck, a train, etc., a ship, an aircraft and other
various vehicles, and more specifically, uses a piezoelectric acoustic driver. The present invention
relates to a vehicle ceiling speaker. [Prior Art] In conventional acoustic systems for vehicles such
as automobiles and trucks, dynamic speakers are usually used as the speakers. And, as the sound
system becomes more advanced, the number of speakers used is increased, and a system which
uses 8 to 10 speakers has been developed. In such an acoustic system, speakers are usually
embedded in a door panel, a front panel, a rear shelf, and the like. SUMMARY OF THE
INVENTION However, since the dynamic type loudspeaker generally used in a vehicle acoustic
system has a large thickness due to its structure and there is a limit to miniaturization, when
trying to attach a large number of dynamic type loudspeakers, the above mentioned There are
cases where it can not be stored in the door panel, front panel, rear shell, etc. In addition, since
the weight is large, the installation is restricted even if it is mounted at a place other than the
above, and there is a problem that the necessary number of speakers can not be installed and a
sufficient acoustic effect can not be obtained. Furthermore, there is a problem that the speaker
narrows the interior of the vehicle when the installation is forced, thereby reducing the amenity
of the vehicle. SUMMARY OF THE INVENTION The present invention solves the above-mentioned
problems, and it is an object of the present invention to provide a lightweight, thin vehicle ceiling
speaker that can be attached to the ceiling of a vehicle. [Means for Solving the Problems] In order
to solve the above problems, the ceiling speaker for a vehicle according to the present invention
is provided with at least one through hole having a shape corresponding to the shape of the
vibration unit described below, By joining a ceiling plate made of foam molded into a
predetermined shape as a material and two foam plates provided with recesses at mutually
opposing positions on mutually opposing surfaces, the recesses facing each other are formed. A
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piezoelectric acoustic driver is housed and supported in the space, and the vibration unit fixedly
fitted in the through hole of the ceiling plate and the ceiling plate on which the vibration unit is
fixedly fitted is disposed on the vehicle room side surface And an interior material. [Operation]
The ceiling speaker for a vehicle according to the present invention is a through hole in a ceiling
plate made of a foam formed into a predetermined shape as a ceiling material of a vehicle, with a
vibration unit formed by sandwiching a piezoelectric acoustic driver with a foam plate. The
interior material is disposed on the inner side of the vehicle interior.
Therefore, the vibration unit can be manufactured separately from the ceiling plate by inserting
and fixing the vibration unit on the ceiling plate, thereby simplifying the manufacturing process
and reducing the manufacturing cost. In addition, this vehicle ceiling speaker is thin and light, is
attached to the interior of the vehicle and constitutes the vehicle ceiling, and the piezoelectric
acoustic driver vibrates the foam plate and the ceiling plate to use the entire ceiling as a speaker
Make it work. That is, the loudspeaker according to the present invention effectively utilizes the
upper surface (ceiling surface) occupying a large area in the vehicle room as the installation
surface, and has a shape similar to that of a normal ceiling in appearance. Or, the appearance of
the room is impaired, and the entire ceiling functions as an acoustic speaker without reducing
the acclimation of the vehicle room, and an excellent acoustic effect is realized. Embodiments of
the present invention will be described below with reference to the drawings. In this
embodiment, a ceiling speaker for a vehicle is described as a vehicle ceiling speaker, but the
ceiling speaker according to the present invention can be applied to ceiling speakers for ships,
aircraft, and various other vehicles as well as vehicles. . FIG. 1 is an exploded perspective view
showing a structure and a manufacturing process of a vibration unit according to one
embodiment of the present invention. As shown in the figure, in the vibrating unit of this
embodiment, a plurality of concave portions 2 are formed at mutually opposing positions of the
mutually opposing surfaces of two foam plates 1a and 1b made of modified polystyrene foam.
The small projection 2 a is formed in the recess 2. The concave portions 2 facing each other form
four spaces 8 (FIG. 5) for housing the piezoelectric acoustic driver 3 when the foam plates 1a and
1b are attached to each other. As shown in FIGS. 2 and 3 in plan view and front view, the
piezoelectric acoustic driver 3 is a thin circular metal element formed by providing an electrode
film (not shown) on both sides of a piezoelectric ceramic plate. The piezoelectric element 4 and
the metal plate 5 are connected to both surfaces of the plate 5 to form a bimorph structure, and
lead wires 6 are connected to the piezoelectric element 4 and the metal plate 5 (FIG. 3). The
piezoelectric acoustic driver 3 is supported in the recess 2 by inserting horizontally into the
recess 2 of the body plate 1a and bonding the central portion of the piezoelectric element 4 to
the upper surface of the small projection 2a. As shown in FIG. 5, two foam plates 1a and 1b are
pasted together, and the small projections 2a of the upper foam plate 1b are brought into contact
with the upper central portion of the piezoelectric element 4 of the piezoelectric acoustic driver 3
to bond them. Do. In the vibration unit 9 configured in this manner, the central part of the upper
and lower screen of the piezoelectric acoustic driver 3 is supported (center supported) from
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above and below by the small projections 2a and 2a of the recess 2 of the foam plates 1a and Ib.
In the space 8 formed by the recesses 2.2 facing each other, they are accommodated in a manner
suitable for vibration.
The lead wires 6 connected to the piezoelectric acoustic drivers 3 are combined into two and
drawn out from the end of the foam plates 1a and Ib as lead wires 6a (FIG. 4). The ceiling plate
20 is formed of a modified polystyrene foam, and as shown in FIG. 6, is formed into a
predetermined shape corresponding to the shape of the roof portion of the vehicle as a ceiling
material of the vehicle (vehicle). In the flat portion of the ceiling plate 20, two through holes 9a,
9a having a shape corresponding to the shape of the above-described vibration unit 9 are
formed. The vibration unit 9 is inserted into the through holes 9 a of the ceiling plate 20 so that
the lower surface thereof is positioned on the lower surface of the ceiling plate 20 and the time
plane, and is bonded by an adhesive and fixed to the ceiling plate 20. . Then, a sheet-like interior
material 7 made of polyvinyl chloride is attached to the surface on the indoor side of the vehicle
(FIG. 7). The vehicle (vehicle) ceiling speaker 10 thus formed is attached to the vehicle 1 as a
ceiling material from the indoor side as shown in FIG. In addition, when attaching the said ceiling
speaker 10 to the vehicle 11, the ceiling speaker 10 is used using a spacer etc. so that foam
board 1a, 1b and the ceiling board 20 may contact | abut to the indoor upper surface of the
vehicle 11, and the vibration will not be disturbed. The ceiling speaker 10 is attached to the
upper surface side of the vehicle interior by a method such as screwing or bonding while
maintaining a predetermined gap between the and the inner surface of the vehicle 11. In the
ceiling speaker 10 for a vehicle (vehicle) configured as described above and attached to a vehicle,
the lead wire 6a drawn therefrom is connected to the output terminal of a vehicle acoustic device
(not shown) such as a car stereo. Then, by giving a predetermined electric signal, the plurality of
piezoelectric acoustic drivers 3 mechanically vibrate, and the vibrations are transmitted to the
foam plates 1a and 1b and the ceiling plate 20 through the small projections 2a. , Vibrate the
entire surface of the ceiling plate 20 to generate a sound. In the vehicle ceiling speaker of the
above embodiment, since the vibration unit 9 is configured to be inserted into and fixed to the
through hole 9a of the ceiling plate 20, the vibration unit 9 is assembled separately from the
ceiling plate 20. Can be manufactured simply by inserting the through-hole 9a of the ceiling plate
20, so the manufacturing process is simplified. The piezoelectric acoustic driver 3 has, for
example, a thickness of about 0.21111, a diameter of about 60 to 8011 + 1. The ceiling speaker
10 has a shape similar to that of a normal vehicle ceiling material because it is thin and light with
an fE amount of about 8 g, and light and thin for the vibration unit y-t 9 and so on with little
influence on the size of the ceiling member 20. The piezoelectric acoustic driver 3 has a middleto-high range, as shown in FIG. 9, which does not impair the aesthetic appearance of the vehicle
interior or squeeze the space in the interior of the vehicle. Since it is excellent in the frequency
characteristic in, it is possible to realize an excellent acoustic effect over the entire frequency
region by combining it with a normal dynamic type speaker excellent in the frequency
characteristic of the bass region.
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Further, some piezoelectric acoustic drivers have excellent frequency characteristics in a low
frequency range. When this is used, a sufficient acoustic effect can be obtained with only the
piezoelectric acoustic driver. In addition, since the entire surface of the ceiling plate 20 (including
the vibration unit 9) vibrates to generate a sound, the acoustic effect in the vehicle interior is
further improved. In the above embodiment, although the case of using modified polystyrene
foam as the foam plates 1a and 1b and the ceiling plate 20 has been described, the material is
not limited to this, and it is a material containing bubbles. A material having a predetermined
heat resistance (at least in the range where the vehicle (vehicle) room temperature rises) and
having an apparent density in the range of 0.01 to 0.2 g / c13, for example, Modified styrenepolypropylene copolymer foam, polypropylene foam, polyethylene foam, polyurethane foam and
other materials can be used. Moreover, foam board 1a, 1b and ceiling & 20 may be comprised
with the same material, respectively, and may be comprised with an exciting material. Further, in
the above embodiment, although the case of using a polyvinyl chloride sheet as the interior
material 7 has been described, the material is not particularly limited, and 1111 I! A fabric
(woven fabric, non-woven fabric, knitted fabric) or a laminate of a slab urethane foam attached
thereto, and other interior materials for various vehicles (vehicles) can be arbitrarily selected and
used. In the above embodiment, although the case where the piezoelectric acoustic driver having
a bimorph structure in which the piezoelectric element 4 is joined to both surfaces of the metal
plate 5 is used as the piezoelectric acoustic driver 3, the piezoelectric acoustic driver has a
bimorph structure The present invention is not limited to this, and it is possible to use another
structure, and as shown in FIG. 10, a piezoelectric acoustic driver in which one piezoelectric
element 4 is joined to one surface of the metal plate 5 may be used. Further, in the above
embodiment, an example was described in which the piezoelectric acoustic driver 3 was centrally
supported by the small protrusions 2a and 2a from both upper and lower surfaces (FIG. 5), but as
shown in FIG. In FIG. 11, the support may be made from the lower surface only to the small
projections 2a. Furthermore, although the support method of the piezoelectric acoustic driver is
preferably center support, it is not necessarily limited to center support. It is possible to obtain
the necessary vibration even by supporting other parts than the central part. The shape of the
vibration unit 9 is not particularly limited, and may be circular or other shape.
Moreover, although it is desirable that it is flat form, it is also possible to comprise in curved
shape other bent shape. The total number of piezoelectric acoustic drivers 3 to be provided to the
ceiling speaker 10 is preferably two or more from the viewpoint of sufficiently vibrating the
whole of the ceiling plate 20 (including the vibration unit 9). Although there is no upper limit, it
is desirable to be in the range of 2 to 16 in consideration of sound effects, economy and the like.
Therefore, with regard to the number of piezoelectric acoustic drivers 3 disposed per one
vibration unit 9, the number of vibration units 9 joined to the ceiling plate 20 and the total
number of piezoelectric acoustic drivers 3 to be provided on the entire ceiling plate An
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appropriate number (for example, 1 to 8) is selected in consideration of the relationship and the
influence on the manufacturing process. Further, the number of through holes 9 a to be formed
in the ceiling plate 20 is determined by the number of vibration units 9 selected and determined
as described above. [Effects of the Invention] As described above, the vehicle ceiling speaker
according to the present invention is formed into a predetermined shape as a ceiling material of a
vehicle, a vibration unit formed by sandwiching a thin and light piezoelectric acoustic driver with
a foam plate. Since the vibration unit is assembled separately from the ceiling plate, the vibration
unit can be manufactured simply by inserting and fixing it in the through hole of the ceiling
plate. The manufacturing process can be simplified to reduce the manufacturing cost. In addition,
since this vehicle ceiling speaker is mounted as a ceiling material in the vehicle room, the ceiling
portion which occupies a large area in the vehicle room is effectively used, and in appearance has
a shape similar to a normal ceiling. The entire ceiling can be made of a high quality acoustic
speaker without impairing the appearance of the vehicle room or reducing the amenity.
Furthermore, by combining the vehicle ceiling speaker according to the present invention with
the conventional dynamic type speaker excellent in the frequency characteristic of the low
frequency band, a further excellent acoustic effect may be obtained in some cases.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an exploded perspective view showing a structure and a manufacturing process of a
vibration unit of a vehicle ceiling speaker according to one embodiment of the present invention,
and FIGS. 2 and 3 are used for the vehicle ceiling speaker according to the present invention FIG.
4 is a plan view and a front view showing a piezoelectric acoustic driver, FIG. 4 is a perspective
view showing a vibration unit according to an embodiment of the present invention, and FIG. 5
shows a state where the piezoelectric acoustic driver is housed and supported between foam
plates. 6 is a perspective view showing a process of inserting the vibration unit into the through
hole of the ceiling plate, FIG. 7 is a perspective view showing a ceiling speaker for a vehicle
according to an embodiment of the present invention, and FIG. 11 is a perspective view showing
a vehicle ceiling speaker attached to a vehicle, FIG. 9 is a diagram showing the frequency
characteristics of the vehicle ceiling speaker, and FIG. 10 is a diagram showing a piezoelectric
acoustic driver according to another embodiment, FIG. Figure shows other embodiments It is a
sectional view showing a supporting state of the piezoelectric type acoustic drivers.
1 a, b ииииии Foam plate 2 иииииииииииииииииииииииииииииии Piezoelectric acoustic driver 4 иииииииии Piezoelectric element
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5 ииииииии Metal plate 7 ...... interior material 9 ...... vibrating unit a ...... through holes 0 ...... ceiling
vehicular speaker applicant Murata Manufacturing Co., Ltd.
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