| 摘要 |
A scanning optical system condensing a light flux deflected by an optical deflector so as to form an optical spot on a surface to be scanned, includes a unitary lens, wherein: a lens configuration in a main scanning cross section is both surfaces with a convex configuration; a lens configuration in a sub-scanning cross section is both surfaces with a convex configuration; both surfaces of the lens are anamorphic surfaces; and a lateral magnification beta<SUB>2 </SUB>in a sub-scanning direction of a central image height of said optical system satisfies the following condition (1): <?in-line-formulae description="In-line Formulae" end="lead"?>0.5<=|beta<SUB>2</SUB>|<=3.0. (1)<?in-line-formulae description="In-line Formulae" end="tail"?>
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