Keyboard switch assembly having printed circuit board with plura

Details Keyboard switch assembly having printed circuit board with plura Keyboard switch assembly having printed circuit board with plura

1976-01-28

1977-08-30

Scott, James R.

Electricity: circuit makers and breakers

Electric switch details

Contact

174 685, 200 5A, 200159B, 200262, 200267, 200270, 361397, 428901, H01H 900, H05K 100

Patent

active

040456366

ABSTRACT:
A printed wiring board for a keyboard switch assembly for electronic apparatus, such as electronic calculators, comprising a self-supporting insulative board having a plurality of elongated connectors on one surface thereof, at least some of the conductors having terminal portions for cooperating with switch elements. A layer of insulating material covers the one surface of the board and the conductors excluding the terminal portions. Each of the terminal portions has a coating of conductive ink thereon and a jumper element also formed of conductive ink is coated on the insulating layer crossing at least one of the conductors embedded therein and joining at least two of the terminal portion coatings. The conductive ink is preferably a noble-metal filled resin compound, such as silver epoxy, screen printed onto the insulating layer and terminal portions.

REFERENCES:
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patent: 3860771 (1975-01-01), Lynn et al.
patent: 3862381 (1975-01-01), Glaister et al.
patent: 3862382 (1975-01-01), Glaister et al.
patent: 3912442 (1975-10-01), Cote
patent: 3912852 (1975-10-01), Simon
patent: 3996430 (1976-12-01), Eberwein et al.

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