Laser beam optical scanning device and image forming apparatus w

Details Laser beam optical scanning device and image forming apparatus w Laser beam optical scanning device and image forming apparatus w

1998-03-31

2000-06-06

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250235, 250216, H01J 314

Patent

active

060721766

ABSTRACT:
A laser beam optical scanning device which focuses and scans a laser beam emitted from laser diode 1 in the arrow b direction on a photosensitive drum 40 via focusing lens 3, polygonal mirror 6, and f.theta. lens 7. The scanning laser beam enters a convergence state detector 10, which detects the amount of dislocation of the convergence position. The amount of positional change is calculated to correct the convergence position based on the detected amount of dislocation, and the focusing lens 3 is moved on the optical axis of the lens via motor 21 to correct the beam convergence position. When processing is executed to correct the convergence position in the intermediate zone of the image formign range and the calculated amount of positional change exceeds a limit value, a detection error is assumed, and the focusing lens 3 is moved an amount less than the limit value.

REFERENCES:
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patent: 5103091 (1992-04-01), Hirose et al.
patent: 5122658 (1992-06-01), Ando
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patent: 5241174 (1993-08-01), Ando
patent: 5418638 (1995-05-01), Hirasawa
patent: 5442171 (1995-08-01), Anzai

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