Electret microphone

Details Electret microphone Electret microphone

1979-02-16

1980-11-25

Cook, Daryl W.

357 26, H04R 1900, H01L 2984

Patent

active

042360510

ABSTRACT:
In an electret microphone in which an impedance conversion element housing chamber for an impedance conversion element is provided on the side opposite from an electret diaphragm with respect to a back electrode in a capsule, an isolating metal plate is disposed in the impedance conversion element housing chamber in spaced relation to the back electrode to define between the isolating metal plate and the back electrode an air compartment which is pneumatically isolated from the impedance conversion element chamber.

REFERENCES:
patent: 3588382 (1971-06-01), Reedyk
patent: 3812575 (1974-05-01), Hedman
patent: 3816671 (1974-06-01), Fraim et al.
patent: 3896274 (1975-07-01), Fraim et al.
patent: 3946422 (1976-03-01), Yagi et al.
patent: 4046974 (1977-09-01), Baumhauer et al.

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