Method and apparatus for an electret transducer

Details Method and apparatus for an electret transducer Method and apparatus for an electret transducer

1972-08-22

1977-03-29

Lanham, C.W.

Metal working

Method of mechanical manufacture

Electrical device making

29594, 307 88ET, 17910041B, 179111E, 156322, 156285, 156252, H01S 400, H04R 3100

Patent

active

040140911

ABSTRACT:
An improved method for making a backplate assembly for an electret transducer used in a microphone wherein a synthetic resin film such as polytetrafluoroethylene or fluorinated ethylene-propylene copolymer is attached to a plate member having a flat conductive surface and which has been heated so as to securely attach the film thereon and charging said synthetic film to form an electret.

REFERENCES:
patent: 2284039 (1942-05-01), Bruno
patent: 2906658 (1959-09-01), Doban
patent: 3130101 (1964-04-01), Gittins et al.
patent: 3276031 (1966-09-01), Gaynor
patent: 3373251 (1968-03-01), Seeler
patent: 3575762 (1971-04-01), Goehring et al.

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