Keyboard membrane switch having threshold force structure

Details Keyboard membrane switch having threshold force structure Keyboard membrane switch having threshold force structure

1975-09-15

1977-04-12

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, H01H 1352, H01H 150

Patent

active

040176975

ABSTRACT:
A keyboard membrane switch including the standard three layer resilient flexible diaphragm switch construction. Threshold pressure is applied to the membrane prior to engagement of the membrane contact with at least one fixed contact. This phenomenon is achieved by applying variable thicknesses of nonconductive threshold paint or glass to the substrate, flexible membrane, a first layer of threshold material or any combination thereof.

REFERENCES:
patent: 3668337 (1972-06-01), Sinclair
patent: 3699294 (1972-10-01), Sudduth
patent: 3721778 (1973-03-01), Seeger, Jr. et al.
patent: 3728509 (1973-04-01), Shimojo
patent: 3745287 (1973-07-01), Walker
patent: 3860771 (1975-01-01), Lynn et al.
patent: 3862382 (1975-01-01), Glaister et al.
patent: 3898421 (1975-08-01), Suzumura
patent: 3941953 (1976-03-01), Misson et al.

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