Laser beam scanning optical apparatus

Details Laser beam scanning optical apparatus Laser beam scanning optical apparatus

1997-07-02

1999-10-19

Lee, John R

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502012, 250235, H01J 314, G01J 120, G02B 2608

Patent

active

059693460

ABSTRACT:
A laser beam scanning optical apparatus which images and scans a laser beam emitted from a laser diode on a photo-sensitive drum through a focusing lens, a polygon mirror and an f.theta. lens. An SOS photosensor detects the scanned laser beam and generates a detection signal. The laser diode is controlled to perform pulse emission a specified time after the generation of the detection signal. The pulse beam is incident to a beam detector which adopts a knife edge method, and the amount of a focal shift is detected. The focusing lens is moved along the optical axis in accordance with the detected amount of a focal shift to correct the position of the image point.

REFERENCES:
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patent: 4800547 (1989-01-01), Kessels et al.
patent: 4990771 (1991-02-01), Minoura et al.
patent: 5019701 (1991-05-01), Yagoto et al.
patent: 5122658 (1992-06-01), Ando
patent: 5231280 (1993-07-01), Imakawa
patent: 5241174 (1993-08-01), Ando
patent: 5418638 (1995-05-01), Hirasawa

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