Keyboard switch assembly

Details Keyboard switch assembly Keyboard switch assembly

1977-01-31

1980-02-26

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200 86R, 200159B, 200275, 200292, H01H 1370

Patent

active

041907485

ABSTRACT:
A keyboard assembly and a keyboard switch are presented in which the keyboard switch is a layer of flexible insulating material with circuit configurations thereon and an array of flat topped protrusions which serve as key switches to effect a snap action contact with tactile feedback between a conductive element on the key switch and another conductive element. Preferably, the areas between the protrusions on the insulating layer are securely clamped relative to a backing or stiffening board, and the protruding key switches are operated by hinged key actuators which make off center contact with the protrusion.

REFERENCES:
patent: 3383487 (1968-05-01), Wiener
patent: 3718791 (1973-02-01), Szablowski
patent: 3800104 (1974-03-01), Lien et al.
patent: 3860771 (1975-01-01), Lynn et al.
patent: 3898421 (1975-08-01), Suzumura
patent: 3916135 (1975-10-01), Holden et al.
patent: 3932722 (1976-01-01), Obata et al.
patent: 3941953 (1976-03-01), Misson et al.
patent: 3978297 (1976-08-01), Lynn et al.
patent: 4029916 (1977-06-01), Chu
patent: 4032729 (1977-06-01), Koistiner
R. K. Hayes et al., IBM Tech. Disc. Bull., "Snap-Action Membrane Switch Keyboard," vol. 7, No. 12, May. 1965, p. 1168.

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