Piezoelectric acoustic device

Details Piezoelectric acoustic device Piezoelectric acoustic device

1996-06-14

1998-06-02

Chan, Wing F.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electrostrictive, magnetostrictive, or piezoelectric

381173, 381191, H04R 2500

Patent

active

057613249

ABSTRACT:
A piezoelectric acoustic device comprises a case and a piezoelectric element which is accommodated in the case and has an inner peripheral surface thereof supported by an inner peripheral surface of the case at a middle portion thereof. A plurality of projections are provided on an inner peripheral surface of the case and spaced circumferentially along the inner peripheral surface of the case for supporting the peripheral portion of the piezoelectric element. A gap between the peripheral portion of the piezoelectric element and the inner peripheral surface of the case is closed by an elastic adhesive. A plurality of projections provided on and spaced circumferentially along the inner peripheral surface of the case contact the periphery of the piezoelectric element at the tips thereof, which restricts a radial movement of the piezoelectric element relative to the case. The piezoelectric acoustic device that is small-sized and is provided with the piezoelectric element having a small diameter can obtain oscillating frequency equivalent to that of a piezoelectric acoustic device provided with a piezoelectric element having a relatively large diameter.

REFERENCES:
patent: 4295009 (1981-10-01), Weidler
patent: 4475014 (1984-10-01), King
patent: 5479521 (1995-12-01), D'Avolio

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