Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1977-09-14
1979-12-25
Scott, James R.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
200159B, 200267, 200292, 361398, H01H 1370, H01H 102, G06F 1502, H05K 100
Patent
active
041807111
ABSTRACT:
An electronic desk-top calculator includes a bottom casing for the calculator on the inner surface of which bottom casing there are provided fixed contacts, and a flexible plate having thereon pairs of contacts provided with wiring conductors therefor. These pairs of contacts are so arranged at the positions in registry with the fixed contacts as to form a matrix. The fixed contacts act as bridging contacts and comprise electrically conductive material containing carbon particles. The pairs of contacts and wiring conductors have a first electrically conductive layer. An insulative layer of moisture-resistive material overlies the first conductive layer except those terminal ends of the wiring conductor which serve as contacts or electrical connectors. The exposed portions of the first conductive layer which function as switch contacts have an additional layer of electrically conductive material containing carbon particles.
REFERENCES:
patent: 3728509 (1973-04-01), Shimojo
patent: 3860771 (1975-01-01), Lynn et al.
patent: 3911234 (1975-10-01), Kotaka
patent: 3987259 (1976-10-01), Larson
patent: 3988551 (1976-10-01), Larson
patent: 4045636 (1977-08-01), Yoder et al.
patent: 4066851 (1978-01-01), White et al.
patent: 4081898 (1978-04-01), Taylor, Jr. et al.
IBM Tech. Disc. Bull., Lester et al., "Switch," vol. 11, No. 11, Apr. 1969, p. 1569.
Harada Yuji
Hirata Osamu
Canon Kabushiki Kaisha
Scott James R.
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