Environmentally sealed variable capacitance apparatus

Details Environmentally sealed variable capacitance apparatus Environmentally sealed variable capacitance apparatus

1981-04-29

1982-11-16

Robinson, Thomas A.

Communications: electrical

Audible indication

Percussion-type sound producer

G08C 902, H03K 1796

Patent

active

043597203

ABSTRACT:
An environmentally sealed key actuatable capacitively coupled circuit board is disclosed comprising first and second flexible dielectric sheets having electrically conductive patterns thereon which form an array of capacitors and connecting matrix of conductors. A spacer is sealed between the sheets and the patterns on the sheets include a first array of capacitor plates on an inner surface of the first sheet and a second array of capacitor plates on the outer surface of the second sheet. A third array of floating capacitor plates is formed by a third pattern on the inner surface of the second sheet.

REFERENCES:
patent: 3660838 (1972-05-01), Gove et al.
patent: 3797630 (1974-03-01), Zilkha
patent: 3921166 (1975-11-01), Volpe
patent: 3921167 (1975-11-01), Fox
patent: 3951250 (1976-04-01), Pointon et al.
patent: 3974332 (1976-08-01), Abe et al.
patent: 4163222 (1979-07-01), Gove
patent: 4194083 (1980-03-01), Abe et al.
patent: 4234871 (1980-11-01), Guglielmi et al.

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