| 摘要 |
The scanning optical system, wherein a plurality of light beams are scanned by only single rotational polygon mirror, and which is simpler, cheaper, due to fewer components, is provided for the image forming apparatus. Axes of a plurality of beam collimators are separated at prescribed pitches with light beam axes, thereby making the light beams incident at different positions at the reflecting surface of the polygonal mirror along the sub-scanning direction. As a result, the light beams are incident at different angles to the rotational polygonal mirror, deflected by the mirror surface, and largely spread from the optical axis of the optical system.
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