| 摘要 |
An optical scanning apparatus, including: a light source including a plurality of light emitting parts; a deflector including a deflecting surface; a first optical system configured to cause the plurality of light beams to enter the deflecting surface at an oblique angle; and a second optical system configured to focus the light beams on a surface to be scanned, in which: the light emitting parts are arranged away from each other; the second optical system includes an optical element including at least one optical surface having a non-arc shape, so that a wave optics interval between scanning lines based on barycentric positions of spot images on the surface to be scanned is aligned along the main scanning direction; the non-arc shape of the at least one optical surface of the optical element within the sub-scanning section is defined by a predetermined condition.
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