Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1998-03-17
1999-11-16
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250206, 315158, 372 31, G01J 132, H05B 3702, H01S 303
Patent
active
059862521
ABSTRACT:
In a laser beam processing apparatus, a laser monitor comprises a photo sensor, a laser power measuring circuit, an A-D converter, a monitor control unit, a comparison decision unit, a display control unit, a display, an alarm generating circuit and a buzzer. A measured laser power signal (analog voltage signal) representative of an instantaneous value of laser power of a pulsed laser beam is produced by the photo sensor and the laser power measuring circuit, and the digital measured laser power signal from the A-D converter is supplied to the comparison decision unit and to the monitor control unit. The monitor control unit sets or determines a monitor reference waveform corresponding to a laser control reference waveform used for waveform control in the processing apparatus and controls the comparison decision unit. The comparison decision unit provides a monitoring decision on the power of the pulsed laser beam, which is displayed by a visual presentation or by display lamps on the display.
REFERENCES:
patent: 4845720 (1989-07-01), Koishi et al.
patent: 4894525 (1990-01-01), Kakuta
patent: 5059210 (1991-10-01), Kakuta et al.
patent: 5287367 (1994-02-01), Wight et al.
Allen Stephone
Miyachi Technos Corporation
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