Laser resistance trimmer

Details Laser resistance trimmer Laser resistance trimmer

1977-10-25

1980-01-15

Reynolds, Bruce A.

Electric heating

Metal heating

By arc

29593, 29620, 219121LM, B23K 900

Patent

active

041840623

ABSTRACT:
This invention relates to an apparatus and method for adjusting the resistance value of an elongated resistance film of typically inconsistent density which has been deposited on an insulative substrate. The resistance incremental of this film is measured between a start point and a wiper point. This resistance is then compared with a specified resistance, and an error signal is generated responsive to any error between the measured resistance and the specified resistance. The error signal is used to regulate the relative motion between a laser beam and the resistance film, with the motion being generally transverse to a longitudinal axis of the resistance film. This motion causes the finely focused laser beam to burn an insulative separation path in the resistance film, thereby regulating the effective width of the resistance film. This regulation of the effective width progresses in a continuous manner over the entire length of the active portion of the resistive element.

REFERENCES:
patent: 3722085 (1973-03-01), Caddock
patent: 3821845 (1974-07-01), Hukee
patent: 3827142 (1974-08-01), Bennett
patent: 4032881 (1977-06-01), Singleton

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