Combination of a laser and a controller for trimming a metallize

Details Combination of a laser and a controller for trimming a metallize Combination of a laser and a controller for trimming a metallize

1985-05-07

1986-08-05

Albritton, C. L.

Electric heating

Metal heating

By arc

219121LK, 372 38, B23K 2600

Patent

active

046045139

ABSTRACT:
The present invention is a combination of a laser system and a controller for use in vaporizing the material of a metallized dielectric film capacitor to form a hole in order to trim its capacitance. The combination includes a laser system which has a laser modulator, a mechanical triggering device and a controller which includes a trigger/reset circuit which is electrically coupled to the mechanical triggering circuit and which provides a trigger signal in its triggered state and a reset signal in its untriggered state. The controller also includes a clock circuit which is electrically coupled to the trigger reset circuit and which provides clock signals in response to the trigger signal and a one-shot monostable, multivibrator circuit having an RC timing circuit which is electrically coupled to the clock circuit and to the laser modulator and which controls the pulse width of its output signal in response to the clock signals. The controller further includes a counter which is electrically coupled to the one-shot monostable, multivibrator circuit and which counts each of the clock signals and a comparator which is electrically coupled to the counter in order to compare the number of the counted clock signals to a selected number and which is electrically coupled to the clock circuit. When the number of the counted clock signal equals the selected number, the comparator provides a clock inhibit signal in order to inhibit the clock circuit from providing any more clock signals.

REFERENCES:
patent: 3806829 (1974-04-01), Duston et al.
patent: 3892023 (1975-07-01), Warmont
patent: 3921041 (1975-11-01), Stockman
patent: 4087672 (1978-05-01), Yi
patent: 4169251 (1979-09-01), Lackmann
patent: 4286250 (1981-08-01), Sacchetti
patent: 4348714 (1982-09-01), Wallace
patent: 4441008 (1984-04-01), Chan
patent: 4476375 (1984-10-01), Doawa
patent: 4485230 (1984-12-01), Yamamoto
patent: 4504727 (1985-03-01), Melcher et al.

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