| 摘要 |
Provided is an optical scanning device, including a light source, an incident optical system for allowing a light beam emitted from the light source to enter a deflection surface of a deflector at a predetermined angle within a sub scanning section, and an imaging optical system for guiding the light beam deflected on the deflector to a surface to be scanned, the imaging optical system including at least one optical element. The at least one optical element constituting the imaging optical system includes a plurality of regions which have different refractive powers in a main scanning direction within a sub scanning section. The light beam from the incident optical system passes through a region of the plurality of regions, which has a refractive power, and the light beam deflected on the deflection surface is entered on another region of the plurality of regions, which has another refractive power. Therefore, compact optical scanning device, in which the deterioration of the optical performance in the oblique incident system can be suppressed and a generation of a refractive index gradient during lens manufacturing can be also suppressed, and image forming apparatus using the optical scanning device can be provided.
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