Method of making an electret acoustic transducer

Details Method of making an electret acoustic transducer Method of making an electret acoustic transducer

1977-04-18

1978-01-31

Hall, Carl E.

Metal working

Electric condenser making

Solid dielectric type

29592E, 29594, 179111E, H04R 3100

Patent

active

040707415

ABSTRACT:
In the method of construction disclosed herein, posts for supporting the condenser transducer diaphragm in relation to a backplate are formed on the diaphragm film itself by selectively etching away a photoresist material laminated to the film. The electret material is then supported on the backplate rather than being carried by the diaphragm.

REFERENCES:
patent: RE28420 (1975-05-01), Murphy
patent: 1975801 (1934-10-01), Rieber
patent: 3663768 (1972-05-01), Madsen
patent: 3812575 (1974-05-01), Hedman
patent: 3895194 (1975-07-01), Fraim

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