Electrical resistors – Mechanically variable – Resistance value varied by removing or adding material
Patent
1977-11-10
1979-01-09
Albritton, C. L.
Electrical resistors
Mechanically variable
Resistance value varied by removing or adding material
338308, 338307, 338320, H01C 1000
Patent
active
041340965
ABSTRACT:
A trimmable resistor includes inner and outer resistive strips which are deposited on a base and spaced apart to form a gap. The outer strip is electrically connected at each end to one of a pair of spaced electrical terminals. A plurality of conductive members are spaced apart along the length of the gap and bridge the gap to connect the two resistive strips at a corresponding plurality of locations. The severing of successive frangible conductive members increases the resistance of the trimmer in increments. In a specific embodiment the resistive strips are formed of a cermet material, the base is an alumina substrate, the gap is arcuate, and a thermosetting plastic resin is disposed in the gap to form an insulating buffer pad for each of the frangible conductive members.
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patent: 2759078 (1956-08-01), Brown
patent: 2953764 (1960-09-01), Tellkamp
patent: 3517436 (1970-06-01), Zandman et al.
patent: 3594679 (1971-07-01), Seay et al.
Briel et al., Western Electric Technical Digest No. 33, Jan. 74, "Lattice-Type Film Resistor with High Pulse Voltage Tolerance, "p. 21.
Briel et al., Western Electric Technical Digest, "Compact Pattern of Parallel Film Resistors with Uniform Power Dissipation Capability," No. 33, p. 19, Jan. 74.
Bross et al., IBM Technical Disclosure Bulletin, "Modular Resistor Array," vol. 13, No. 5, Oct. 1970, p. 1105.
Albritton C. L.
Allen-Bradley Company
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