| 摘要 |
In an optical scanning apparatus, a light beam emitted from a light source is collimated and is incident on a reflecting surface of a deflector via stop member. The deflector deflectively reflects the light beam to be directed to a surface to be scanned. The light beam deflectively reflected by the deflector is converged on the surface to be scanned by an optical system. The stop member has an aperture which is constructed such that a circular shape aperture and a slit-like shape aperture are combined. The width of the slit-like shape aperture is arranged in a sub-scanning direction while the circular portion of the circular shape aperture is arranged in a main scanning direction.
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