Metal working – Electric condenser making
Patent
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.
Cote Paul L.
Sallavanti Robert A.
Gentex Corporation
Hall Carl E.
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