Vacuum stressed polymer film piezoelectric transducer

Details Vacuum stressed polymer film piezoelectric transducer Vacuum stressed polymer film piezoelectric transducer

1976-08-11

1977-12-20

Stellar, George G.

Electrical generator or motor structure

Dynamoelectric

Rotary

310334, 310344, H04R 1700

Patent

active

040643751

ABSTRACT:
An electro-acoustic transducer has a piezo-electric film polymer diaphragm which is stressed to a part spherical surface and the periphery of which is clamped. Electrodes placed over the surface of the diaphragm apply an electric field transverse the plane thereof which causes elongation parallel to the plane of the diaphragm. The rim of the diaphragm is mounted in a supporting framework which forms part of an enclosure isolating one side of the diaphragm from the atmosphere. The enclosure may be evacuated to improve the performance of the transducer by avoiding problems due to the formation of standing waves within the enclosure.

REFERENCES:
patent: 2565159 (1951-08-01), Williams
patent: 2895062 (1959-07-01), Abbott
patent: 3894198 (1975-07-01), Murayama et al.

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