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DESCRIPTION JPH08336196

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DESCRIPTION JPH08336196
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezoelectric speaker fixed so as to support the periphery of a circular piezoelectric multilayer
ceramic plate of substantially the same size on both sides of a single disk.
[0002]
2. Description of the Related Art Conventionally, as shown in FIG. 3, in a piezoelectric speaker,
the periphery of a monomorph or bimorph circular piezoelectric ceramic plate (3) is supported
and fixed to a frame (10), and 11), and the sound was emitted from the front side of the cone
through the holes of the box (12).
[0003]
[Problems to be solved by the invention] a.
In conventional piezoelectric speakers, the sound from the front and back of the cone cancels
each other out, so the output of the sound is low as it is. ロ. The use of a speaker box or baffle
board increases the overall size and complexity of the structure. ハ. The sound output was low
because it uses only the sound of corn paper. The present invention was invented to solve these
drawbacks.
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[0004]
SUMMARY OF THE INVENTION In order to solve the above problems, the piezoelectric speaker
according to the present invention peripherally supports a circular piezoelectric multilayer
ceramic plate of substantially the same size on both sides of a single disk. It is characterized in
that it is fixed.
[0005]
In the above structure, since the circular piezoelectric multilayer ceramic plates fixed on both
sides of the disk perform respiratory vibration on each other centering on the disk, the sounds
emitted from both circular piezoelectric multilayer ceramic plates have the same phase. And
therefore the overall sound output is high.
[0006]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a piezoelectric
speaker according to the present invention will be described below with reference to the attached
drawings.
As shown in FIG. 1, the piezoelectric speaker (1) generally supports the periphery of a circular
piezoelectric multilayer ceramic plate (3), (4) of substantially the same size as that of the disk (2)
on both sides. It comprises a fixed peripheral support ring (5), (6).
[0007]
As shown in FIG. 2, the circular piezoelectric multilayer ceramic plates (3) and (4) are polarized
in the thickness direction by the external electrodes (7) and the internal electrodes (8).
A sound absorbing material (9) is placed in the space between the ceramic plates (3) and (4) and
the disk (2).
[0008]
The present invention has the above-mentioned structure, and when it is used, the sounds
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emitted from the circular piezoelectric multilayer ceramic plates (3) and (4) have their phases
centered with each other.
[0009]
As is apparent from the above description, according to the present invention, the phases of
sounds emitted from substantially the same size of the piezoelectric multilayer ceramic plate
fixed to the both sides of the disk by the peripheral support are mutually centered. As such, the
overall sound is increased relative to one another over a wide frequency range, resulting in a
large output.
Therefore, the speaker box and the baffle board are not required, and the speaker can be made to
be extremely compact with a simple structure.
[0010]
Brief description of the drawings
[0011]
1 is a perspective view showing an embodiment of a piezoelectric speaker according to the
present invention.
[0012]
2 is a cross-sectional view of the piezoelectric speaker shown in FIG.
[0013]
3 is a cross-sectional view showing a conventional example.
[0014]
Explanation of sign
[0015]
1. Piezoelectric speaker 2. Disc 3. Circular piezoelectric multilayer ceramic plate 4. Circular
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piezoelectric multilayer ceramic plate 5. Peripheral support ring 6. Peripheral support ring 7.
External electrode 8. Internal electrode 9.. .. Sound absorbing material 10 .. Frame 11 .. Cone 12 ..
Box
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