Electric heating – Metal heating – By arc
Patent
1981-12-02
1983-09-06
Albritton, C. L.
Electric heating
Metal heating
By arc
29620, 338195, B23K 2700
Patent
active
044031335
ABSTRACT:
A method of trimming a resistance element is disclosed which comprises cutting transversely into one side of the element until the measured total resistance of the element increases by a fraction 1/N of a fixed percentage of a desired total resistance value. The fraction 1/N is approximately equal to the path length of the resistance element divided by the designed width of the transverse cut and the fixed percentage is equal to the percent deviation of the initial total resistance of the element from a nominal, desired resistance value. After the transverse cut is made, a longitudinal-type cut is made at a distance, equal to the length of the transverse cut, from the edge of the element having the transverse cut to isolate a portion of the element from the remainder of the element so that the isolated portion has the desired total resistance. This method is particularly suitable for use with computer controlled laser trimming systems used to mass produce resistance elements.
REFERENCES:
patent: 3379567 (1968-04-01), Wright
patent: 3758745 (1973-09-01), Wilker et al.
patent: 3947801 (1976-03-01), Bube
patent: 4032881 (1977-06-01), Singleton
patent: 4146673 (1979-03-01), Headley
patent: 4159461 (1979-06-01), Kost et al.
patent: 4242152 (1980-12-01), Stone
Riley Richard E.
Turner Bradley D.
Adour David L.
Albritton C. L.
Daley Donald F.
Spectrol Electronics Corp.
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