Electrical resistors – Mechanically variable – Resistance value varied by removing or adding material
Patent
1979-08-09
1981-08-18
Albritton, C. L.
Electrical resistors
Mechanically variable
Resistance value varied by removing or adding material
29620, 338308, H01C 1000
Patent
active
042849705
ABSTRACT:
A method of fabricating thin and thick film resistors which results in stable resistance characteristics, ability to withstand high current or voltage and a precise method of trimming small resistors. After the resistor film (20) and contacts (22 and 23) thereto are formed, the resistors are trimmed by a cut (24) along the length dimension so that the width of the current path is reduced uniformly. The waste portion of the resistor is then separated from the circuit by a cut (27) along its width. Current crowding in the vicinity of the cut is therefore essentially eliminated.
REFERENCES:
patent: 3211031 (1965-10-01), Martin
patent: 3947801 (1976-03-01), Bube
Berrin Lloyd
Cohen Howard M.
Grupen William B.
McElroy James D.
Albritton C. L.
Bell Telephone Laboratories Incorporated
Birnbaum Lester H.
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