| 摘要 |
An optical scanning device includes a semiconductor laser array is used as the light source, a polygon mirror that has a deflection-reflecting surface and deflects light beams on the deflection-reflecting surface, and a scanning optical system that scans and focuses the light beams on a target surface with a predetermined spacing between the light beams in a sub-scanning direction. The light beams are incident to the deflection-reflecting surface at angles with respect to a normal of the deflection-reflecting surface in the sub-scanning direction, and incident to the deflection-reflecting surface at substantially the same angles in the main scanning direction.
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