Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1983-02-09
1984-05-29
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
200 86R, 200159B, 200267, 200292, 361398, H01H 1370
Patent
active
044517149
ABSTRACT:
A spacerless switch circuit for use in multiple switch keyboards includes a first base member having a front surface and a second base member having a front surface in touching relationship against the front surface of the first base member. A plurality of first and second conductor traces are respectively deposited on the front surfaces of the first and second base members. An insulative layer is deposited over regions of either or both of the first and second conductor traces to insulate the conductor traces from each other when the front surfaces of the two base members are touching one another. One or more first switch contacts are deposited on the first base member and one or more facing second switch contacts are deposited on the second base member to define one or more on/off switches. At least one of the first switch contacts includes a first conductive pad and a first pressure sensitive layer applied over the first conductor pad so that a surface junction is formed between the first and second switch contacts where the surface junction is electrically nonconductive when the first contact noncompressively touches the facing second contact and is electrically conductive when the first contact compressively touches the facing second contact.
REFERENCES:
patent: 3383487 (1968-05-01), Wiener
patent: 3987259 (1976-10-01), Larson
patent: 3996430 (1976-12-01), Eberwein et al.
patent: 4066851 (1978-01-01), White et al.
patent: 4145584 (1979-03-01), Otterlei
patent: 4287394 (1981-01-01), Hargita et al.
patent: 4301337 (1981-11-01), Eventoff
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