Plural electret electroacoustic transducer

Details Plural electret electroacoustic transducer Plural electret electroacoustic transducer

1975-02-14

1976-09-14

Stellar, George G.

H04R 1900

Patent

active

039808386

ABSTRACT:
An electrostatic type electroacoustic transducer includes a stationary electrode having a rear electrode, a pair of electret films formed one at each side of the rear electrode, and a plurality of through holes. A pair of movable electrodes are each disposed, through a respective spacer, on the electret film bearing stationary electrode in a manner to confront the electret film. Acoustic signal voltage is supplied between the movable electrodes.

REFERENCES:
patent: 3118979 (1964-01-01), Sessler et al.
patent: 3136867 (1964-06-01), Brettell
patent: 3821492 (1974-06-01), Tamura et al.
patent: 3894198 (1975-07-01), Murayama et al.
patent: 3896274 (1975-07-01), Fraim et al.

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