Conductive coatings for electret devices

Details Conductive coatings for electret devices Conductive coatings for electret devices

B - Operations, Transporting

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B41M 1/00 (2006.01) H01G 7/02 (2006.01) H05K 3/12 (2006.01) H05K 1/00 (2006.01)

Patent

CA 1186569

CONDUCTIVE COATINGS FOR ELECTRET DEVICES Abstract of the Disclosure Electret transducers, for example microphones, have a backplate which is metallized on one surface, the metallized surface forming one side of a capacitor. A frame sits on the metallized tape to hold the tape taut over the backplate. Metal connections are made to the backplate and frame to complete the circuit. The metallization is conventionally formed by vapour deposition of aluminum. This is a lengthy and relatively expensive process. Also the metallization can give rise to galvanic problems. The invention prints a pattern of conductive ink on the various parts. Good contact is obtained, galvanic action avoided and a reduction in manufacturing costs occurs. Simplified assembly is also obtained. - i -

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