Method of making a variable capacitor microphone

Details Method of making a variable capacitor microphone Method of making a variable capacitor microphone

1991-01-30

1992-04-07

Hall, Carl E.

Metal working

Electric condenser making

29594, 296311, 381191, H01G 516

Patent

active

051015439

ABSTRACT:
A method of making a variable capacitor microphone in which the fixed capacitor element is formed by first coating the metallized surface of a relatively rigid insulating substrate with a polarizable dielectric material and then placing the substrate on one of a pair of spaced electrodes positioned in an ionizable gas and subjecting the gas to the action of alpha rays to produce ions in the space between the electrodes while applying a potential across the electrodes to cause ions to migrate toward the dielectric material to polarize the same to form an electret. After the fixed capacitor element has thus been formed, it is mounted in spaced relationship to a flexible diaphragm to form a microphone.

REFERENCES:
patent: 2723349 (1955-11-01), Rylsky
patent: 4397702 (1983-08-01), Klein et al.
patent: 4429191 (1984-01-01), Busch-Vishniac et al.
patent: 4730283 (1988-03-01), Carlson et al.
patent: 4764690 (1988-08-01), Murphy et al.

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