Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1986-09-26
1988-03-22
Kittle, John E.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428432, 428901, 338171, 338312, B32B 300, B32B 1500, H01C 1032
Patent
active
047328029
ABSTRACT:
An improved resistive element comprises a film-type resistive layer applied to an insulative substrate and then fired. An array of discrete, spaced apart islands of predominantly conductive material is then applied to the resistive layer in a repetitive pattern having predetermined inter-island spacing. The islands have a conductivity that is substantially greater than the conductivity of the resistive layer. Preferably, the islands are of substantially uniform shape and size. In one preferred embodiment, the islands are formed of a conductive thick film ink that is screen-printed onto a cermet resistive layer through an appropriate mask, and then fired. In another preferred embodiment, the islands are formed of a conductive metal that is applied to the resistive layer by vapor deposition, sputtering, or ion implantation through a suitable mask. Either embodiment of the invention provides a resistive element with lower contact resistance and improved contact resistance stability than prior art film-type resistive elements, while maintaining good linearity, setability, and resolution.
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Bosze Wayne P.
Froebe Ronald L.
McClure Gordon
Thomas, Jr. Ronald E.
Weingartner Philip F.
Becker William G.
Bourns Inc.
Kittle John E.
Klein Howard J.
Ryan Patrick J.
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