Graphite trace electrical interconnect

Details Graphite trace electrical interconnect Graphite trace electrical interconnect

1988-08-10

1989-12-26

Nimmo, Morris H.

Metal working

Method of mechanical manufacture

Electrical device making

29846, H05K 100, H05K 300

Patent

active

048899615

ABSTRACT:
An electrical interconnect or switch device for interconnecting electrical and electronic elements on a printed circuit board uses a carbon/graphite trace is used to connect electrical contact pads on a ceramic or similar substrate. The substrate surface has a plurality of electrically conductive contact pads and a plurality of isolation regions defined on the substrate surface such that each of the contact pads is separated from the remaining contact pads by at least one of the isolation regions. Each of the contact pads may be electrically connected to one or more of the circuit elements on the printed circuit board and a trace means, preferably a carbon/graphite pencil lead, is used to selectively electrically interconnect two or more of the contact pads by tracing between the selected contact pads across at least one of said isolation regions, thereby electrically interconnecting the circuit elements associated with the selected contact pads. The switch has particular application for three different types of physical devices: a dual in-line package (DIP) switch configuration, a surface mount configuration, and a configuration where the electrical interconnect is established directly on the substrate surface of the printed circuit board.

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Feulner, R. A., "Circuit Repair and Fabrication"; IBM Technical Disclsoure Bulletin; vol. 9, No. 10; Mar. 1967; p. 1309.
Greenwood, R. W.; "Silver Bearing Conductive Pastes"; IBM Technical Disclosure Bulletin; vol. 17, No. 2; Jul. 1974; p. 437.

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