Coating processes – Electrical product produced
Patent
1983-03-30
1985-04-02
Kittle, J. E.
Coating processes
Electrical product produced
427 79, 427122, 101 35, 101 41, B05D 512, B41F 1700
Patent
active
045087555
ABSTRACT:
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 vapor 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.
REFERENCES:
patent: 3701317 (1972-10-01), Miyamoto
patent: 4249043 (1981-02-01), Morgan et al.
patent: 4382328 (1983-05-01), Janszen
patent: 4389459 (1983-06-01), Mirra et al.
patent: 4403547 (1983-09-01), Forberger
Fleming Robert J.
Gumb Bev W. T.
Reintjes Anthony B.
Jelly Sidney T.
Kittle J. E.
Northern Telecom Limited
Seidleck James J.
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