Keyboard switch

Details Keyboard switch Keyboard switch

1984-09-21

1986-04-22

Scott, J. R.

Electricity: circuit makers and breakers

Special application

200DIG1, 200159B, 361288, H01G 501, H01H 900

Patent

active

045844445

ABSTRACT:
A keyboard switch is provided with 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 on the first electrode, a button positioned on the top portion of the second electrode, and a rubber cap disposed between the button and second electrode, for giving snap feeling to an operator when the button is depressed and the capacitance of the switch exceeds a given value. The capacitance varies with the change in the facing area which changes substantially in proportion to the depth of depression of the button. The switch is capacitive-coupled for a switching operation and the snap feeling is given to the operator when the capacitance exceeds the given value.

REFERENCES:
patent: Re30435 (1980-11-01), Fukao
patent: 3842230 (1974-10-01), Kashio et al.
patent: 3932722 (1976-01-01), Obata et al.
patent: 3965399 (1976-06-01), Walker, Jr. et al.
patent: 4046975 (1977-09-01), Seeger, Jr.
patent: 4453061 (1984-06-01), Tamura
patent: 4458293 (1984-07-01), Cherry
patent: 4482932 (1984-11-01), Hasegawa
IBM Tech. Disc. Bulletin; Harris, R. H.; "Conical Return and Capacitive Coupling Spring Keyboard Switch", vol. 24; No. 8; Jan. 1982; pp. 4014, 4015.

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