| 摘要 |
<p>An optical scanning apparatus and a color image forming apparatus using the same, in which streak-shaped density unevenness is reduced to prevent image deterioration: each of scanning surfaces is simultaneously scanned with light beams emitted from light source units (201) and scanning lines are simultaneously drawn on the scanning surfaces; the light beams emitted from at least four light emitting portions (LD21-LD28) of the corresponding light source unit are simultaneously deflected for scanning by a deflecting unit (5); and image data corresponding to a first scanning line, i.e. a scanning line located on an uppermost stream side in a direction in which the scanning surfaces move among scanning lines, on at least one of the scanning surfaces in a k-th scanning by the deflecting unit (5) is displaced by at least one line space from image data corresponding to a first scanning line on another scanning surface in the k-th scanning.
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