Patent ID: 7633664
Filing Date: 2009-12-15
Classification: G02B

Abstract:
1. A laser scanning unit, comprising: a plurality of light sources symmetrically disposed; a rotatable deflector for deflecting slantingly incident light beams symmetrically in a sub-scanning direction from the plurality of light sources; first and second f-θ lenses for focusing the light beams reflected by the deflector on scanning lines on a plurality of photosensitive drums and disposed symmetrically with respect to a rotational axis of the deflector; and a plurality of mirrors for guiding the light beams that have passed through the first and second f-θ lenses toward the respective photosensitive drums, wherein the plurality of mirrors are disposed asymmetrically with respect to the rotational axis of the deflector so that the scanning lines formed on the respective photosensitive drums are deflected in the substantially same direction.