Isolation membrane switch

Details Isolation membrane switch Isolation membrane switch

1979-05-07

1980-12-02

Pollard, Steven M.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200 86R, H01H 302, H01H 312

Patent

active

042373581

ABSTRACT:
A membrane switch includes a substrate having a plurality of first conductors formed thereon and a flexible membrane having a plurality of second conductors formed thereon. A spacer is positioned between the substrate and membrane and there are openings in the spacer in register with aligned first and second conductors. To isolate the switch membrane, there is a pressure reduction membrane overlying and in contact with the exterior of the switch membrane and an isolation membrane positioned on top of the pressure reduction membrane. Areas of the pressure reduction membrane in register with the spacer openings are formed to reduce the required force thereupon to effect movement of the switch membrane.

REFERENCES:
patent: 3617660 (1971-11-01), Krakinowski
patent: 3862381 (1975-01-01), Glaister et al.
patent: 4066850 (1978-01-01), Heys, Jr.
patent: 4128744 (1978-12-01), Seeger

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