Double flexure disc electro-acoustic transducer

Details Double flexure disc electro-acoustic transducer Double flexure disc electro-acoustic transducer

1975-11-20

1977-09-27

Tudor, Harold

Communications: electrical

Selective

Addressing

310366, 310 10, H04B 1300

Patent

active

040514552

ABSTRACT:
Improved low frequency electro-acoustic transducer apparatus of the type employing two piezoelectrically driven flexure discs mounted at the ends of a short cylindrical housing containing an acoustic mismatch fluid, is provided. The piezoelectrically driven flexure discs are constructed as assemblies having a plurality of concentric piezoelectric laminar sandwich units to excite the flexure discs. By individually electrically exciting the concentric sandwich structures through band-pass filters and a selective interconnection network, the flexure discs function with a plurality of resonant frequencies of flexing to provide broad band and efficient operation.

REFERENCES:
patent: 2875355 (1959-02-01), Peterman
patent: 2967956 (1961-01-01), Dranetz et al.
patent: 3153156 (1964-10-01), Watlington
patent: 3351903 (1967-11-01), Straube
patent: 3457543 (1969-07-01), Akervold et al.
patent: 3497731 (1970-02-01), Straube
patent: 3510698 (1970-05-01), Massa
patent: 3513439 (1970-05-01), Egli
patent: 3832762 (1974-09-01), Johnston

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