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JPS5136666

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DESCRIPTION JPS5136666
BRIEF DESCRIPTION OF THE DRAWINGS The drawing is a longitudinal side view of an
embodiment of the present invention. Concave portion of the plate, 3 · · · · · · · · · · Fixing member.
147−
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a
piezoelectric diaphragm generated by a piezoelectric element. Conventionally, a so-called
bimorph type diaphragm in which a piezoelectric element is bonded to a metal sheet is known,
but the bonding between the metal sheet and the piezoelectric element is not performed unless
the adhesive is cured for a long time. In addition, the bonding position of the piezoelectric
element is deviated, and the resonance frequency of the diaphragm (1) and the Q value of the
diaphragm are extremely dispersed. The productivity was extremely bad. The present invention
eliminates the above-mentioned drawbacks and adheres the piezoelectric element to the correct
position, thereby suppressing the variation of the resonant frequency of the diaphragm and the Q
value of the diaphragm, and providing a piezoelectric buzzer with good productivity. The purpose
is to Next, an embodiment of the present invention will be described with reference to the
drawings. The drawing is a longitudinal side view of an embodiment of the present invention. The
diaphragm is composed of the piezoelectric element 1 and the metal plate 2 and is supported by
the agency member 5. The central portion of the metal plate 2 has a concave shape 2G and is
used for positioning when the piezoelectric element 1 is bonded. Although not shown, the
diaphragm is connected to the torsion circuit KII. Since the bonding position of the piezoelectric
element 1 is improved by the configuration as described above, the variation of the resonance
frequency and the Q value of the diaphragm is reduced, and the productivity can be improved.
(2) It is possible to provide a piezoelectric buzzer having a stable diaphragm.
04-05-2019
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