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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device for a carse de leo installed in a vehicle. [Prior Art] FIG. 5 is a side view of a
conventional vehicle speaker shown in, for example, Japanese Utility Model Application
Publication No. 57-i17ss4. In particular, FIG. 2, 3, and 4 are installation positions of the speakers.
In the speaker device configured as described above, a flat-drive type low-frequency speaker is
installed at any of the installation positions 2, 3 and 4, and a middle-high-high-tone speaker is
installed at a general foot or a door. [Problems to be Solved by the Invention] As described above,
in the conventional vehicle speaker apparatus, it is necessary to install the mid-high range
speaker in a different position from the low-range speaker installed on the ceiling as described
above. The location of the speakers must be set at two or more locations. For this reason, in the
conventional speaker device, in order to provide the driver or the passenger with the optimum
sound, it is necessary to design the sound in detail, and, for example, in the case of stereo of two
or more channels, two mid-high-tone speakers Therefore, there is a problem that at least one
bass speaker is required and three or more speakers are required in total to increase the number
of parts, and the wiring therefor becomes complicated. SUMMARY OF THE INVENTION The
present invention was made to solve the above-described problems, and it is an object of the
present invention to provide a vehicle speaker device with a simplified structure and effective use
of the ceiling of the vehicle. [Means for Solving the Problems] In the vehicle speaker device
according to the present invention, at least the bass speaker of the speaker device mounted on
the ceiling in the vehicle uses a polymer piezoelectric material or a composite piezoelectric
material as a diaphragm. It consists of a piezoelectric speaker. [Operation] In the present
invention, since the speaker device attached to the ceiling is constituted by the piezoelectric type
speaker, the thickness of the speaker body can be made extremely thin, and therefore there is no
sense of disparity even when installed on the ceiling. In addition, the integral speaker simplifies
the structure and facilitates the installation. FIG. 1 and FIG. 2 are diagrams showing the
construction of a vehicle speaker apparatus according to an embodiment of the present
invention. In these figures, 1 is a vehicle, 10 is a speaker mounted on the ceiling of the vehicle 1
and both left and right channels are integrated, 11 and 12 are right and left channel speakers of
the speaker 10, and 13 are these speakers Frames for fixing or supporting the diaphragms 11
and 12 and frames 14 and 15 for fixing both ends of the diaphragm of the speaker 11.12 in the
horizontal direction in the drawing.
The speaker 10 configured in this manner is embedded in the ceiling along the ceiling surface of
the vehicle 1 or fixed to the left and right ends of the vehicle 1 and both speakers 11 and 12 are
covered above the respective seats. It has a curved shape. Further, a sheet of a piezoelectric
material made of polymer or composite is used as a diaphragm of the speaker 11.12, and the
speaker 10 is configured to be very thin when viewed from the front. The sound generation
principle of the piezoelectric material diaphragm used in the speakers 11 and 12 is shown in FIG.
In FIG. 3 (al, 20 is a polymeric piezoelectric material or a composite piezoelectric material
stretched in the horizontal direction in the figure, and 21 and 22 are electrodes of a conductor
formed on the front and back of the piezoelectric material 20 by vapor deposition or the like. It
is. As is well known, a piezoelectric material is a material having the property of being polarized
to generate an electric charge in a material when a mechanical force, that is, strain is applied, and
generating an electric charge when an electric charge is applied, and causing a mechanical strain
to expand and contract. The latter phenomenon is used when used as a speaker as in the case of
a speaker. If this is applied to FIG. 3, an effect of expanding and contracting the piezoelectric
material 20 in the left and right direction of the drawing is utilized here when an electric field is
applied to the piezoelectric material 20 in the vertical direction by the electrodes 21 and 22.
Then, in order to use this as a sounding body, as shown in FIG. 3 (b), the piezoelectric material 20
is curved in the lateral direction to fix both ends. When an electric field is applied in this state,
both ends of the piezoelectric material 20 are fixed, so that the piezoelectric material 20 is
displaced or vibrated up and down in the figure, that is, as indicated by a dot-and-dash line. A
polymer or composite uniform piezoelectric material is easy to be formed into a sheet, and as
described above, the speaker can be thinned and at the same time the material itself is soft
(hyphens) and m + 4 like resonance The influence of the noise is not large, and the sound
pressure characteristics can be broadened. That is, it is possible to constitute a speaker of the
entire band by one diaphragm. In addition, since there is no heavy magnetic circuit as in the
electrodynamic speaker, it is possible to reduce the weight of the speaker in spite of the large
area. In the above embodiment, the speaker 10 is mounted on the ceiling of the front seat of the
vehicle 1. However, it may be a rear seat, and it may be sized so as to cover the entire ceiling. It is
also good. In addition, although the speaker 10 shows an example of two speakers 11.12 curved
in the left and right direction of the vehicle 1, each speaker 11.12 has a structure curved in the
front and rear direction of the vehicle 1 as shown in FIG. May be Furthermore, in the above
embodiment, a two-channel speaker using two full-band speakers 11 and 12 is shown. It may be
a composite speaker integrated as a whole, and the number of channels is not limited to two.
Further, although the vehicle 1 has been described as a passenger car in the above embodiment,
the same effect can be obtained with a bus, a truck or the like. As described above, according to
the present invention, the speaker device is integrally attached to the ceiling in the vehicle using
a piezoelectric speaker using a polymer or composite piezoelectric material as a diaphragm. As a
result, the configuration of the speaker device can be simplified and the mounting can be
facilitated. In addition, since the speaker itself can be made thin, there is no sense of disparity
even when installed on a ceiling, and there is also an effect that the ceiling can be effectively
Brief description of the drawings
1 and 2 are a front view showing a mounting state of a vehicle speaker device according to one
embodiment of the present invention to a vehicle, a perspective view seen from above, and FIG. 3
a diagram showing the sound generation principle of a piezoelectric speaker. Fig. 4 is a
perspective view from above showing a speaker apparatus for a vehicle according to another
embodiment of the present invention, and Fig. 5 is a side view of the vehicle showing a
conventional speaker apparatus for a vehicle.
Reference Signs List 1: vehicle 10: speaker 11: right channel speaker 12: left channel speaker 13:
frame 20: piezoelectric material In the drawings, the same reference numerals indicate the same
or corresponding parts.
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