Two-layer membrane switch

Details Two-layer membrane switch Two-layer membrane switch

1992-05-06

1995-08-01

Fetsuga, Robert M.

Electricity: circuit makers and breakers

Solid contact

Membrane type

200512, 200520, 200 5A, H01H 110

Patent

active

054381770

ABSTRACT:
A two-layer membrane switch particularly suited for application as a keyswitch in low-profile keyboard applications, such as keyboards for notebook or laptop type personal computers. When used as a keyswitch, the switch comprises a first conductor layer including a conductive ink patterned as an electrical contact on a polyester dielectric film around an opening through the film. A second conductor layer, also includes a conductive ink patterned as an electrical contact on a polyester dielectric film. With the electrical contact of the second conductor layer located under the corresponding opening in the first conductor layer, a moveable, conductive elastomer switch closure is used to establish electrical contact between the electrical contact of the first conductor layer and the electrical contact of the second conductor layer through the opening in the first conductor.

REFERENCES:
patent: 3721778 (1973-03-01), Seeger, Jr. et al.
patent: 3996427 (1976-12-01), Kaminski
patent: 4341934 (1982-07-01), Muller
patent: 4794215 (1988-12-01), Sawada et al.
patent: 5115106 (1992-05-01), Weiland et al.
"Electronic Keyboard," A. L. Akers & G. T. Williams, IBM Technical Disclosure Bulletin, vol. 25, No. 11B, Apr. 1983.

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