| 摘要 |
An optical scanning device comprises a light source unit having a plurality of light emitting portions arranged in the sub scanning direction, an optical system for directing a plurality of light beams from the light source unit onto a predetermined surface, and a deflector for deflecting the plurality of light beams from the light source unit and scanning them on the predetermined surface. In the optical scanning device, the following condition is satisfied: 0<¦ beta ¦</=2, where beta is the imaging lateral magnification of the optical system in the sub scanning direction.
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