| 摘要 |
An optical scanner includes a plurality of light source units, each light source unit outputting a corresponding light beam; a light deflector having a deflecting surface that deflects the light beams output from the light source units; and a scanning optical system that condenses each light beam deflected by the light deflector onto a corresponding scanning surfaces. The light beams output from the light source units make an angle in a sub-scanning direction with respect to a normal to the deflecting surface. At least one surface of the scanning optical system has not curvature in the sub-scanning direction, and is a special surface having different tilt decentration angles in the sub-scanning direction according to a position in the main scanning direction.
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