Electrical resistors – Mechanically variable – Resistance value varied by removing or adding material
Patent
1979-09-04
1981-11-03
Albritton, C. L.
Electrical resistors
Mechanically variable
Resistance value varied by removing or adding material
29620, 338308, 338309, 338324, 338325, H01C 1000
Patent
active
042988560
ABSTRACT:
Several planar configured, metallized resistor embodiments (25, 35, 45, 55, 65) are disclosed, as are several methods of manufacturing and resistance trimming the same, particularly to values of resistance lower than the "as fabricated" nominal value thereof. In accordance with one preferred resistor embodiment (25), a plurality of associated discrete conductive bonding pads (29) are formed on a common supporting substrate (27), with each pad being in conductive contact with a different spaced site along the body portion (25a) of the resistor between the terminating ends thereof. The bonding pads (29) are advantageously adapted to allow bonded wire connections to be made between different selected pairs thereof, after fabrication of the resistor, whenever necessary to incrementally reduce the initial nominal value of resistance of the resistor to a lower desired value.
In accordance with several other resistor embodiments (35, 55, 65), the bonding pads (41 and 42, 59, 72) thereof are arranged in clusters so as to allow the use of solder bridges, as well as bonded wires, to interconnect selected ones of adjacent pairs of the pads as required to establish a desired lower value of resistance.
Also in accordance with the principles of the invention, one illustrative resistor (45) incorporates a plurality of short-circuiting shunts (52), in addition to a plurality of bonding pads (47). The shunts are interconnected to the body portion (45a) of the resistor at different spaced sites therealong such that when selectively opened, the then existing value of resistance of the resistor is incrementally increased, whereas when short-circuit connections are selectively established between different pairs of the bonding pads (47), the then existing resistance of the resistor is incrementally decreased.
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patent: 3056937 (1962-10-01), Pritikin
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patent: 3344387 (1967-09-01), Kinkel et al.
patent: 3930304 (1976-06-01), Keller et al.
patent: 4041440 (1977-08-01), Davis et al.
patent: 4146957 (1979-04-01), Toenshoft
Albritton C. L.
Bergum K. R.
Western Electric Company, Incorporated
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