Membrane keyboard assembly

Details Membrane keyboard assembly Membrane keyboard assembly

1982-05-19

1984-04-03

Goldberg, E. A.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, 200305, H01H 900

Patent

active

044409907

ABSTRACT:
The membrane keyboard assembly comprises upper and lower membrane keyboards, a spacer interposed therebetween and a common flexible base including two half portions associated with the upper and lower membrane keyboards. The flexible base has silver paint contact areas and connection lines printed thereon and the silver paint connection lines have gaps at spaced points along their length. Resistive layers are applied on the contact areas and connection lines including the gaps therein so that suppression resistances in series connected across the connection lines are formed. The resistance value of the suppression resistances can be varied by suitably selecting the length and width of the connection lines.

REFERENCES:
patent: 4243852 (1981-01-01), Larson
patent: 4287394 (1981-09-01), Hargita et al.
patent: 4303960 (1981-12-01), Sherwood et al.

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