Correction device of light beam deviation of primary scanning di

Details Correction device of light beam deviation of primary scanning di Correction device of light beam deviation of primary scanning di

1994-03-16

1995-06-20

Ben, Loha

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

250235, 347 19, G02B 2608

Patent

active

054265282

ABSTRACT:
A correction device for correcting the deviation of light beams of a primary scanning direction used for an image forming apparatus in which a plurality of light beams are simultaneously scanned on a recording medium in the primary scanning direction so that a plurality of lines are simultaneously recorded. A plurality of beam detectors, the number of which corresponds to the number of beams of light, are disposed in a scanning region in parallel with the primary scanning direction. Only one light beam is incident upon each beam detector, and a difference of detection time between the plurality of beam detectors is detected by a same beam detection interval detector. A different beam detection interval detector detects a time difference between detection of different light beams are detected. Based on the time differences detected by the same beam detection interval detector and by the different beam detection interval detector, a deviation time calculator calculates the deviation of a plurality of light beams of the primary scanning direction. Based on the calculation result of the deviation time calculator, a deviation corrector controls the phase of a printing clock for the image formation conducted by the plurality of light beams and also controls a timed relation of the start of image formation.

REFERENCES:
patent: 4933549 (1990-06-01), Fujioka et al.
patent: 4950889 (1990-08-01), Budd et al.
patent: 4978849 (1990-12-01), Goddard et al.
patent: 5103091 (1992-04-01), Hirose et al.

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