Capacitance controlled keyswitch

Details Capacitance controlled keyswitch Capacitance controlled keyswitch

1979-05-29

1981-09-08

Goldberg, E. A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

200DIG1, 4004791, H01G 516

Patent

active

042888360

ABSTRACT:
A tri-state capacitance controlled keyswitch having a deformable concave electrode moveable by means of an actuator toward and away from a pair of capacitor plates underlying a dielectric layer in order to change the capacitive coupling between the capacitor plates. The electrode is normally remote from the dielectric layer in a weak capacitance open circuit position, a first higher capacitance closed circuit position exists when the electrode is undeformed and is in contact with the dielectric layer, and a second highest capacitance closed circuit position exists when the electrode is deformed and is in contact with the dielectric layer.

REFERENCES:
patent: 3693059 (1972-09-01), Harris
patent: 3710209 (1973-01-01), Webb et al.
patent: 3900712 (1975-08-01), Fukao
patent: 3965399 (1976-06-01), Walker
IBM Tech. Disc. Bulletin, vol. 17, #11, Apr. 1975, p. 3377.

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