| 摘要 |
There is provided a scanning optical system, which is provided with a light source, a cylindrical lens that converges the beam emitted by the light source in an auxiliary scanning direction, a polygonal mirror, and an optical element that has a reflection surface to reflect the beam deflected by the polygonal mirror. The optical element converges the beam deflected by the polygonal mirror on the surface to be scanned to form a beam spot. In this case, the cylindrical lens is arranged such that the beam, which enters into the cylindrical lens and exits from the cylindrical lens without being reflected by inner surfaces of the cylindrical lens, is deflected in the auxiliary scanning direction by the cylindrical lens and is incident on the polygonal mirror.
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