Membrane keyboard switch assembly having selectable tactile prop

Details Membrane keyboard switch assembly having selectable tactile prop Membrane keyboard switch assembly having selectable tactile prop

1980-09-17

1982-12-07

Scott, J. R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200 86R, 200159B, H01H 1370

Patent

active

043629113

ABSTRACT:
A "membrane"-type keyboard includes a resilient foam layer having an array of holes therein with the layer being sandwiched between first and second flexible membranes having electrical conductors thereon which are arranged to complete a circuit associated with a hole when the first and second membranes are moved toward each other. Embodiments including dome-shaped areas in the first flexible membranes provide for "tactile feedback" and additional foam layers enhance the operating characteristics of the embodiments. The method generally entails determining the operating parameters of a desired keyboard and simply changing the relative density and/or thicknesses of various layers and flexible membranes in the keyboard to obtain radically variable paremeters, as for example, the location of the "makepoint" of the switch at various positions between the start and end of "key travel."

REFERENCES:
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patent: 4246452 (1981-01-01), Chandler
Hayes, R. K. et al., "Snap-Action Membrane Switch Keyboard", IBM Technical Disclosure Bulletin, vol. 7, No. 12, May 1965, p. 1168.

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