Key switch

Details Key switch Key switch

1985-12-24

1987-04-21

Scott, J. R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200DIG1, 200159B, 340365C, 361288, H01H 1370, H01G 501, G08C 902

Patent

active

046598790

ABSTRACT:
A key switch including a substrate prepared from dielectric material, and first and second electrodes respectively formed on the bottom and top surfaces of the substrate to constitute a capacitor together with the substrate. The first electrode is electrically connected to a pulse voltage signal oscillator, thereby pulsatively storing a static capacitance between the first and second electrodes. A first fixed contact electrically connected to the second electrode is provided on that portion of the surface of the substrate. A second fixed contact is positioned near the first fixed contact. The first and second fixed contacts are electrically connected or shut by a manually operable movable conductive rubber contact.

REFERENCES:
patent: Re30435 (1980-11-01), Fukao
patent: 3797630 (1974-03-01), Zilkha
patent: 3951250 (1976-04-01), Pointon et al.
patent: 4127740 (1978-11-01), LaMarche
patent: 4303811 (1981-12-01), Parkinson
patent: 4356358 (1982-10-01), Fukukura
patent: 4359720 (1982-11-01), Chai et al.
patent: 4380040 (1983-04-01), Posset
patent: 4415781 (1983-11-01), Frame

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