| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-beam optical scanning device of compact size, which suppresses image deterioration and achieves high speed printing, and also to provide an image forming apparatus using the same. SOLUTION: A multi-beam optical scanning device includes: a light source device 1; a deflector 5 for deflecting a plurality of light beams from the light source device; and an imaging optical system LB for imaging a plurality of light beams deflected by the deflector, on a photosensitive drum 8. A plurality of light beams pass through positions which are spaced apart from each other in the sub-scan direction with respect to the optical axis of at least one of the respective imaging optical elements of the imaging optical system. The photosensitive drum is so disposed that, when, among the plurality of light beams passing through the imaging optical element having a largest positive power in the sub-scan direction among imaging optical elements composing the imaging optical system, a light beam which passes through a position furthermost from a meridional of the imaging optical element is incident on the photosensitive drum, an incidence angle thereof in the sub-scan direction with respect to a surface normal of the photosensitive drum becomes smallest as compared with the other light beam or beams. COPYRIGHT: (C)2009,JPO&INPIT |
