Coating processes – Electrical product produced – Resistor for current control
Patent
1988-02-26
1989-04-25
Beck, Shrive
Coating processes
Electrical product produced
Resistor for current control
427103, 427125, 4271265, 4273835, 4273763, B09D 512
Patent
active
048246948
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.
REFERENCES:
patent: 3386165 (1968-06-01), Bruhl
patent: 3539392 (1970-11-01), Cockbain
patent: 4540463 (1985-09-01), Kakuhashi
patent: 4540604 (1985-09-01), Siuta
patent: 4685203 (1987-08-01), Takada
patent: 4728534 (1988-03-01), Ho
Bosze Wayne P.
Froebe Ronald L.
McClure Gordon
Thomas, Jr. Ronald E.
Weingartner Philip F.
Beck Shrive
Becker William G.
Bourns Inc.
Dang Vi Duong
Klein Howard J.
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