Thin film resistor and method for producing same

Electrical resistors – Mechanically variable – Resistance value varied by removing or adding material

Patent

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Details

338308, 338309, 21912168, 21912169, 29620, H01C 1010

Patent

active

050814397

ABSTRACT:
A planar film resistor is trimmable by a laser beam. A pair of electrodes are spaced apart on a substrate and make contact with a film of resistive material disposed therebetween. The resistive material includes a laser produced trim region disposed internally to all boundaries of the resistive material, and extends through the thickness of said film. The trim region has an elongated dimension which is orthogonal to the most direct current path between the electrodes. In a preferred embodiment, the resistive material is covered by a passivating layer and is trimmed after the passivating layer is in place.

REFERENCES:
patent: 3996551 (1976-12-01), Croson

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