| 摘要 |
A scanning optical system includes a light source for emitting a beam of light and a first optical system that changes a cross-sectional shape of the beam into an oblong shape along a main scanning direction. A light deflector deflects the oblong cross-sectioned beam of light in the main scanning direction, and a second optical system receives a beam of light deflected by the light deflector for focusing the deflected beam of light onto a scanning surface. At least one surface of a lens in the first optical system is formed as a sub-scanning-plane aspherical surface so as to correct the spherical aberration of the scanning optical system in a sub-scanning direction caused by the second optical system.
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