Optical scanning unit, image forming apparatus, and method...

Details Optical scanning unit, image forming apparatus, and method... Optical scanning unit, image forming apparatus, and method...

2007-01-23

2007-01-23

Cherry, Euncha P. (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C347S234000, C347S249000

Reexamination Certificate

active

10981677

ABSTRACT:
An optical scanning unit includes an optical deflector, a plurality of scanning optical systems, and a pixel-clock generating unit. A photodetector is arranged in at least two locations on a writing-start side and a writing-end side outside the writing area. The optical scanning unit measures a scanning time, and corrects respective dot positions of image data in the writing area to arbitrary positions based on an amount of fluctuation of the scanning time measured.

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