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DESCRIPTION JPS5437134

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DESCRIPTION JPS5437134
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a conventional piezoelectric
speaker, and FIG. 2 is a sectional view showing an embodiment of the piezoelectric speaker of the
present invention. 8 · · · · · · · · · · · · · · · · · · · · · · · · · · · · diaphragm, 10 · · · damping material, 11 · · · · ·
· · · piezoelectric element.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
speaker constructed by incorporating a diaphragm coupled to a piezoelectric element in a frame,
and the improvement of the characteristics is a total of 09. A conventional piezoelectric speaker
is configured as shown in FIG. That is, a cone having a piezoelectric element j'3 attached to the
inner bottom of the frame 1 formed in a dish shape via the metal of the sound absorbing material
2 and a peripheral edge thereof attached to the edge of the frame 1) A central portion of the
diaphragm 4 is coupled I, and a small piece of a sound absorbing material furnace 4-31'3 "25 is
disposed between the diaphragm 4 and the piezoelectric element 3, and a terminal 6 provided on
the frame 1 and the piezoelectric element 3 Is connected to the electrode by a lead 7. In such a
configuration, the resonance of the piezoelectric element 3 and the resonance of the diaphragm 4
are damped by the sound absorbing members 2 and 0. However, the contact area between the
sound absorbing member 6 and the piezoelectric element 3 is a small piece of the sound
absorbing member 6 Because the sound absorbing material 6 does not stem at the central
portion of the scale electric element f3, which is the largest point of the vibration amplitude of
the piezoelectric element 3, the resonance damping of the piezoelectric element 3, and the
piezoelectric element 3 and the diaphragm It was not possible to stop the /) F talk during 4 years.
The scheme eliminates the above-mentioned conventional drawbacks. The following is an
explanation with reference to FIG. 8 is a plate shape formed by a gold plate such as an iron plate,
rt = frame, and the inner bottom portion of this frame 8 except for the joint portion with the
central portion of the Kono-like diaphragm 9 (>, polyurethane foam around A piezoelectric
element 113 provided with a damping material 1o made of a material v1 having a high damping
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effect such as rubber or the like is disposed. The −d edge of the diaphragm 9 is bonded to the
periphery of the frame 8 by bonding or the like. Further, a lead wire 12 is connected to the
electrode of the piezoelectric element 11, and this lead wire 12 is drawn out from the damping
material 1o and connected to a terminal 13 provided on a part of the frame 8. The damping
material 1 o can be formed by wrapping or molding the piezoelectric element 11. Further, the
damping material 1o and the central portion of the diaphragm 9 are in close contact. With this
configuration, the piezoelectric element 11 is damped in resonance over the entire outer surface,
and the central portion which is the maximum point of the vibration amplitude of the
piezoelectric element 1'11 is also covered with the damping material 10. While a great effect can
be obtained for photographing and damping, the damping material 10 is also present between
the piezoelectric element 11 and the diaphragm 9;), so that the acoustic radiation due to the
vibration of the moon-type element 11 can be attenuated. -Interference-It is possible to prevent
the generation of standing waves and to stabilize the characteristics.
As described above, the piezoelectric speaker according to the present invention can be made to
have excellent characteristics by reducing resonance and mutual interference unique to the
piezoelectric speaker, and has a large practical value.
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