Membrane keyboard apparatus having common apertured electrode, a

Details Membrane keyboard apparatus having common apertured electrode, a Membrane keyboard apparatus having common apertured electrode, a

1975-04-03

1976-10-26

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, H01H 1364

Patent

active

039885518

ABSTRACT:
Membrane keyboard apparatus is disclosed as including an insulator having a conductive sheet thereon providing a plurality of first electrode members and a plurality of second electrode members to form an array of individual switching units. A membrane member is disposed in a spaced relation above and adjacent to the level of the top surfaces of the pluralities of first and second electrode members. The membrane member is formed of a flexible, plastic, insulative sheet member, and includes: an array of indicia corresponding to the array of individual switching units formed on the first, bottom surface of the sheet member; a background color layer formed on the bottom surface of the sheet member and over the array of indicia; a very thin, conductive layer formed on the background color layer and applied to form patterned areas for providing a conductive path between the first and second electrode members of the individual switching units selected; and height differential members formed in the membrane member. The height differential members formed in the membrane member have a first, actuated position where the conductive layer provides a conductive path between the associated first and second electrode members of the actuated individual switching unit and a second, nonactuated, normal position where the conductive layer is electrically spaced from at least the second electrode members to electrically insulate the first electrode members and the second electrode members.

REFERENCES:
patent: 3591749 (1971-07-01), Comstock
patent: 3643041 (1972-02-01), Jackson
patent: 3731014 (1973-05-01), Brady
patent: 3749859 (1973-07-01), Webb et al.
patent: 3806673 (1974-04-01), Boulanger
patent: 3842230 (1974-10-01), Kashio et al.
patent: 3854018 (1974-12-01), Reynolds et al.
patent: 3860771 (1975-01-01), Lynn et al.
patent: 3862382 (1975-01-01), Glaister et al.

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