Capacitive switch

Details Capacitive switch Capacitive switch

1976-04-12

1977-09-06

Goldberg, E. A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

200DIG1, 340365C, H01G 501

Patent

active

040472418

ABSTRACT:
A capacitive switch includes: an electrical circuit formed by two spaced pads of conductive material on an insulative substrate; and a capacitive coupling member on the end of a keystem wherein the end of the keystem has a looped ribbon formed by two layers of insulating material sandwiching a layer of conductive material. As the keystem is urged toward the substrate a monotonically increasing area of the ribbon mechanically contacts the pads so that a monotonically increasing capacitive coupling is made between the two spaced pads.

REFERENCES:
patent: 3676607 (1972-07-01), Nash
patent: 3693059 (1972-09-01), Harris
patent: 3710209 (1973-01-01), Webb
patent: 3823355 (1974-07-01), Batz
patent: 3965399 (1976-06-01), Walker

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