| 摘要 |
An optical scanning system includes a light source, a polygon mirror, a first optical system, a second optical system, and a monitoring device. The light source includes a plurality of light-emitting units. The first optical system is arranged on an optical path of light beams, and guides the light beams from the light source to the polygon mirror. The second optical system guides the light beams deflected by the polygon mirror to a photosensitive drum. The monitoring device monitors light amount of light beams emitted from the light-emitting units. An optical axis of a coupling lens and a cylindrical lens is inclined from a normal of a deflection-reflection surface of the polygon mirror with respect to a sub-scanning direction.
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