Electricity: circuit makers and breakers – Multiple circuit control – Pivoted contact
Patent
1974-03-22
1976-06-22
Goldberg, E. A.
Electricity: circuit makers and breakers
Multiple circuit control
Pivoted contact
200DIG1, 340365C, H01G 501
Patent
active
039653994
ABSTRACT:
An electro-mechanical transducer for use in keyboards and the like which incorporates a capacitance change utilization concept. The transducer includes a plunger assembly reciprocably disposed in a housing therefor, in operative disposition over capacitance forming areas on an insulated substrate. The plunger assembly includes a key button disposed on one end of a shaft, an intermediate flange on the shaft and a flange at the other end of the shaft. The intermediate flange is positioned adjacent a frusto-conical elastomeric return spring and also serves as a resilient stop for the shaft. A compressible foam or sponge-like material having a thin, flexible metalized dielectric material on its lower portion, is mounted on the lower surface of the other flange. Actuation of the shaft downwardly toward the substrate causes the dielectric material to bridge the capacitance forming areas related thereto to cause a change in capacitance and transfer of energy therebetween. The metalized dielectric material is highly flexible to allow it to readily conform to irregularities in the capacitance forming area.
REFERENCES:
patent: 3303263 (1967-02-01), Myers
patent: 3328653 (1967-06-01), Wolf
patent: 3659163 (1972-04-01), Borisov
patent: 3693059 (1972-09-01), Harris
patent: 3710209 (1973-01-01), Webb
patent: 3797630 (1974-03-01), Zilkha
patent: 3900712 (1975-08-01), Fukao
Shevlin John B.
Walker, Jr. Frank A.
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