| 摘要 |
PROBLEM TO BE SOLVED: To accurately adjust a beam pitch while achieving miniaturization of an apparatus. SOLUTION: A first light source and a second light sources are arranged directly turnably around an axis parallel to laser beams emitted from one side, being parallel and adjacent to each other in a subscanning direction perpendicular to a main scanning direction. Thus, the first light source and the second light source are closely arranged in the subscanning direction in a range in which the light sources do not interfere with each other. Consequently, the apparatus is made compact and a beam pitch can be accurately adjusted. COPYRIGHT: (C)2010,JPO&INPIT
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