Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1997-11-10
2000-11-21
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347247, 347261, 250205, B41J 247
Patent
active
061510564
ABSTRACT:
In a laser scanning apparatus having a polygonal mirror, the laser light reflected from the multiple reflecting surfaces of polygonal mirror is detected with a photosensor. The respective detection outputs are stored in associated storage media (sample and hold circuits). When a certain reflecting surface has been rotated to the next laser light scan position, the detection output for the previous laser light scan is read out of the storage medium. A correction voltage is generated on the basis of the thus read detection output and the reference voltage is corrected with the generated correction voltage. Since the emission output of laser diode is controlled on the basis of the corrected reference voltage, the photoreceptor can be scanned with laser light of constant optical intensity despite the variation in the reflectance of laser light among the multiple reflecting surfaces of the polygonal mirror.
REFERENCES:
patent: 4201944 (1980-05-01), Beunders
patent: 5001341 (1991-03-01), Negishi
patent: 5248997 (1993-09-01), Summers
patent: 5461414 (1995-10-01), Honda et al.
Asahi Kogaku Kogyo Kabushiki Kaisha
Le N.
Pham Hai C.
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