| 摘要 |
A light scanning device includes a polygon mirror configured to be rotatable around a rotation axis to reflect and deflect a light beam with a plurality of reflecting surfaces, a light source that makes a light beam incident onto the polygon mirror from an outside of a scanning range of the light beam being scanned in a main scanning direction by the polygon mirror, and an image forming optical system that converges the deflected light beam as a spot scanned in the main scanning direction on a scanned surface. In a state where the light beam is directed to a center of the scanning range on the scanned surface, a chief ray of the light beam intersects with a reflecting surface at a point shifted by a predetermined amount in a direction toward a side opposite the light source front a center of the reflecting surface in the main scanning direction.
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