Method of making a variable capacitor microphone

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

H - Electricity

01

L

356/200, 117/206

H01L 41/22 (2006.01) H01G 7/02 (2006.01) H04R 19/01 (2006.01)

Patent

CA 2017185

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.

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