| 摘要 |
A scanning optical system for scanning a light beam on an object surface in a main scanning direction is provided. The scanning optical system includes a light source, a polygonal mirror, and an optical system for focusing the light beam deflected by the polygonal mirror on the object surface. The rotation axis of the polygonal mirror is inclined with respect to an auxiliary scanning direction, which is perpendicular to the main scanning direction, to displace the beam spot in the auxiliary scanning direction. The light beam incident on the reflecting surface is also inclined with respect to a main scanning plane, which is parallel to the main scanning direction and includes an optical axis of the optical system, to displace the beam spot in the same auxiliary scanning direction that the beam spot is displaced due to the inclination of the rotation axis.
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