| 摘要 |
An optical scanning apparatus includes a light source having a plurality of light-emitting portions arranged as inclined with respect to a main scanning direction, a deflector for deflecting a plurality of light beams emitted from the light source, an imaging system for guiding the plurality of light beams deflected and reflected by the deflector, onto a scanned surface, a detector arranged substantially at the same position as the scanned surface and in a normal direction to the main scanning direction. The detector detects scanning positions of the plurality of light beams and a difference between pass times of the plurality of light beams to thereby detect deviation of the scanning positions and variation of magnification of the optical scanning apparatus. A correcting device is provided for correcting drawing positions of the plurality of light beams on the scanned surface, based on the result of detection by the detector.
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