Optically clear membrane switch

Details Optically clear membrane switch Optically clear membrane switch

1977-04-25

1979-03-06

Tufariello, T. M.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, 200268, 200292, 204 15, 427 98, H01H 926, C25D 502, C25D 534

Patent

active

041432533

ABSTRACT:
Membrane switch assembly comprises a transparent laminate comprised of three sheets of cellulose acetate material. The intermediate sheet has an opening therein which defines a switch site. Hairline conductors on the internal surfaces of the outer sheets cross each other at the switch site so that the switch is closed when one of the outer sheets is pressed at the switch site. The conductors are produced on the surfaces of the outer sheets by a process including electroless deposition of blanket coatings of conductive metal, selective deposition along lines which define the conductors and selective etching of the blanket coating to leave the hairline conductors.

REFERENCES:
patent: 3296099 (1967-01-01), Dinella
patent: 3745095 (1973-07-01), Chadwick et al.
IBM Tech. Disclosure, vol. 15, No. 2, Jul. 1972, pp. 544 and 545.
Plating, Feb. 1972, pp. 135-137.

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