Electrical resistors – Mechanically variable – Resistance value varied by removing or adding material
Patent
1990-11-16
1992-01-14
Lateef, Marvin M.
Electrical resistors
Mechanically variable
Resistance value varied by removing or adding material
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
Batdorf Kerry L.
Natzle Wesley C.
Pogge H. Bernhard
International Business Machines - Corporation
Lateef Marvin M.
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