| 摘要 |
An optical scanning system having an imaging optical system for imaging a plurality of light beams deflected by a deflecting surface of a optical deflector upon different scan surfaces. The imaging optical system includes an imaging optical element which has at least one optical surface defined, with respect to the sub-scan sectional plane, in accordance with different functions related to different regions. When with respect to the sub-scan sectional plane the plurality of light beams incident on one and the same deflecting surface of the optical deflector have the same reflection point thereon, there is relationship defined for a meridional line of the optical surface of the imaging optical element defined in accordance with the function, whereas when the plurality of light beams have different reflection points on the optical deflector, there is a different relationship for the meridional line.
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