Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1986-07-07
1987-08-04
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
200159B, 200308, H01H 1370
Patent
active
046847677
ABSTRACT:
The present invention is directed to an improved membrane switch of the kind comprising a polymeric overlay, which is generally planar and containing designated switch areas thereon for manual operation of pressure. The switch is formed from several layers of conductive and nonconductive materials. Specifically, the switch includes a pair of electronic switch circuit leads disposed in noncontacting proximity. A substantially planar circuit completing layer formed to corresponded with the pair of switch circuit leads is formed from conductive material and disposed and spaced array substantially parallel to the switch circuit leads. A nonconductive spacer is disposed, in one preferred embodiment, between the electric circuit and the circuit completing layer, with the spacer having a plurality of apertures therein of a selected density sufficient to provide a selected touch pressure. In another preferred embodiment, the substantially planar circuit completing layer is omitted, and the pair of electronic switch circuit leads are instead disposed in separate planes and are separated by the spacer, such that manual pressure on the switch will contact one circuit lead with the other circuit lead through the apertures in the spacer. Additionally another preferred embodiment includes the use of an improved actuator laminae including a top sheet having distinct dome-shaped portions which provide affirmative and detectable tactile responses.
REFERENCES:
patent: 3860771 (1975-01-01), Lynn et al.
patent: 3959610 (1976-05-01), Finnegan et al.
patent: 4066850 (1978-01-01), Heys, Jr.
patent: 4237351 (1980-12-01), Boulanger et al.
patent: 4423294 (1983-12-01), Walser et al.
patent: 4499343 (1985-02-01), Prioux et al.
patent: 4508942 (1985-04-01), Inaba
patent: 4602135 (1986-07-01), Phalen
Scott J. R.
Ward Robert M.
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