Membrane keyboard and method of providing selectable tactile...

Details Membrane keyboard and method of providing selectable tactile... Membrane keyboard and method of providing selectable tactile...

H - Electricity

01

H

306/305

H01H 13/70 (2006.01) H01H 13/02 (2006.01) H01H 13/702 (2006.01)

Patent

CA 1173089

MEMBRANE KEYBOARD AND METHOD OF PROVIDING SELECTABLE TACTILE PROPERTIES THEREFOR Abstract of the Disclosure 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 feed- back" and additional foam layers enhance the operating characteristics of the embodiments. The method generally entails determining the operating parameters of a de- sired keyboard and simply changing the relative density and/or thicknesses of various layers and flexible mem- branes in the keyboard to obtain radically variable paremeters, as for example, the location of the "make- point" of the switch at various positions between the start and end of "key travel".

385766

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