Laser scanner power compensation circuit

Details Laser scanner power compensation circuit Laser scanner power compensation circuit

1986-06-30

1988-06-14

Goldberg, E. A.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

346160, 358296, G01D 942

Patent

active

047515236

ABSTRACT:
A circuit for correcting the write power of a laser raster output scanner as it scans across the write drum. During calibration, a piece of glass reflects part of the beam into a photo multiplier tube, the output of which is converted into a digital signal. This is compared to a reference signal. The difference for each segment of the scan is stored in RAM and also is converted back to an analog signal to modulate an acousto-optic modulator in the laser optics to correct the write power. After the system has settled to a point where the write power at the drum does not vary across the scan, the glass may be removed and the system operates using the corrections stored in RAM.

REFERENCES:
patent: 3848087 (1974-11-01), Carrell

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