| 摘要 |
A light scanning device includes a light source configured to emit a laser beam, a deflector configured to deflect and scan the laser beam emitted from the light source in a main scanning direction and an image forming optical system configured to converge the light beam deflected by the deflector as a spot scanning in the main scanning direction on a scanned object surface. The image forming optical system is configured such that at least part of ghost light caused inside the image forming optical system is converged within a predetermined range in the main scanning direction regardless of an incident angle with which the laser beam deflected by the deflector is incident on the image forming optical system, and that the at least part of ghost light is separated from drawing light for forming an image in an auxiliary scanning direction which is perpendicular to the main scanning direction.
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