| 摘要 |
An optical scanning device for scanning over a scanned surface in a main scanning direction with a plurality of light beam at the same time, which comprises a light source section having a plurality of light emitting sources that can be driven separately, a deflector for deflecting the plural light beams emitted from the light emitting sources, and an image formation optical system for focusing the light beams on the scanned face, the image formation optical system having an image formation magnification along the main scanning direction which is equal to or less than an image formation magnification along a sub scanning direction perpendicular to the main scanning direction.
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