Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1997-11-10
2000-06-20
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347247, 347253, 347236, 347237, 250205, 250236, G01J 132
Patent
active
060783478
ABSTRACT:
In a laser scan based recording apparatus, laser light from a measuring laser diode is directed to one reflecting surface of a polygonal mirror. The reflected light is detected with a measuring photodiode. The reflectance of laser light is calculated from the detection output of the measuring photodiode and a reference voltage is generated. When the reflecting surface has rotated to the position where the laser light from laser light source scans a photoreceptor drum, the emission output of the laser light source is controlled by a laser output control circuit on the basis of the generated reference voltage. Despite variation in reflectance among the multiple reflecting surfaces of the polygonal mirror, the photoreceptor is scanned with a constant optical intensity of laser light. Since automatic power control is performed at all times, overdriving of the laser diode is effectively prevented to protect it against breakdown, producing consistent and highly reliable laser power control.
REFERENCES:
patent: 4201944 (1980-05-01), Beunders
patent: 4713672 (1987-12-01), Horihata et al.
patent: 5001341 (1991-03-01), Negishi
patent: 5369423 (1994-11-01), Hunter et al.
patent: 5461414 (1995-10-01), Honda et al.
patent: 5498869 (1996-03-01), Appel et al.
Asahi Kogaku Kogyo Kabushiki Kaisha
Le N.
Pham Hai C.
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