Capacitive keyboard switch

Details Capacitive keyboard switch Capacitive keyboard switch

1983-04-06

1984-08-14

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

H01G 501

Patent

active

044660464

ABSTRACT:
A capacitive switch employs a conical conducting spring disposed within a switch housing in spaced relation to an underlying capacitive plate which is covered by a dielectric layer. The bottom coil of the spring engages slots of the housing so that the spring is held above the capacitive plate. A substantially zero capacitance is defined when the switch is in its rest state with the spring biasing a switch pushbutton upwardly. When the pushbutton is pressed, the spring is compressed against the underlying capacitive plate. The compressed coils of the spring define a predefined capacitance which indicates the depressed condition of the switch.

REFERENCES:
patent: 3653038 (1972-03-01), Webb
patent: 3659163 (1972-04-01), Borisov et al.
patent: 3797630 (1974-03-01), Zilkha
patent: 4083100 (1978-04-01), Flint et al.
patent: 4209819 (1980-06-01), Seignemartin
I.B.M. Technical Disclosure Bulletin, Jan. 1982, vol. 24, No. 8, pp. 4014-4015.

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