Keyboard switch

Details Keyboard switch Keyboard switch

1981-10-19

1984-11-13

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

H01G 501

Patent

active

044829329

ABSTRACT:
A keyboard switch comprises an insulating substrate, a first electrode laid on the insulating substrate, a second electrode formed of a conical coil spring and facing the first electrode, a dielectric disposed between the first and second electrodes, and a bottom for linearly changing the facing area between the first and second electrodes. The capacitance between the first and second electrodes is changed linearly so that the first and second electrodes are capacitive-coupled for switching operation when the capacitance exceeds a given value.

REFERENCES:
patent: 1740159 (1929-12-01), Dublier
patent: 3653038 (1972-03-01), Webb et al.
patent: 3693059 (1972-09-01), Harris
patent: 4047241 (1977-09-01), Lav
patent: 4288836 (1981-09-01), Thornburg et al.
IBM Technical Disclosure Bulletin vol. 17 No. 11 Apr. 1975 pp. 3377-3378.

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