Piezoelectric electro-acoustic transducer

Details Piezoelectric electro-acoustic transducer Piezoelectric electro-acoustic transducer

1997-07-24

1999-09-21

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310321, 310326, H01L 4108

Patent

active

059558210

ABSTRACT:
A piezoelectric electro-acoustic transducer has a substantially decreased resonant frequency without having to modify the size of a piezoelectric diaphragm or the shape of casing members used therein. The piezoelectric electro-acoustic transducer has a piezoelectric diaphragm including a metal plate and a piezoelectric ceramic disc disposed on one surface of the metal plate, wherein the piezoelectric diaphragm is to be supported at its periphery. A plurality of projections are specifically provided for stress transmission suppression at the periphery of the piezoelectric diaphragm in order to suppress or eliminate occurrence of circumferential transmission of a stress at the periphery during activation of the transducer.

REFERENCES:
patent: 3700938 (1972-10-01), Bryant
patent: 4190782 (1980-02-01), Guess
patent: 4273399 (1981-06-01), Myess et al.
patent: 4630465 (1986-12-01), Hatton
patent: 4641054 (1987-02-01), Takahata et al.
patent: 4965483 (1990-10-01), Abe et al.
patent: 5053671 (1991-10-01), Kobayashi et al.
patent: 5226325 (1993-07-01), Komurasaki et al.
patent: 5371428 (1994-12-01), Kikuchi et al.

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