Laser scanning unit and color laser printer having the same

Details Laser scanning unit and color laser printer having the same Laser scanning unit and color laser printer having the same

2006-10-11

2009-12-15

Cherry, Euncha P (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

Reexamination Certificate

active

07633664

ABSTRACT:
A laser scanning unit and an image forming apparatus having the same are provided. The laser scanning unit includes a plurality of light sources symmetrically disposed, and a rotatable deflector deflecting slantingly incident light beams symmetrically in a sub-scanning direction from the plurality of light sources. First and second f-θ lenses focus the light beams reflected by the deflector on scanning lines on photosensitive drums and are disposed symmetrically with respect to a rotational axis of the deflector. Mirrors guide the light beams that have passed through the first and second f-θ lenses toward the respective photosensitive drums. The mirrors are disposed asymmetrically with respect to the rotational axis of the deflector so that the scanning lines formed on the respective photosensitive drums may be deflected in the same direction.

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