| 摘要 |
PROBLEM TO BE SOLVED: To obtain an optical scanning apparatus capable of obtaining a high definition image that has little beginning displacement between each scanning unit, and also to obtain an image forming apparatus using the same. SOLUTION: The optical scanning apparatus includes a plurality of light source units, a deflecting unit, a plurality of incident optical systems provided so as to correspond to the light source units, and at least one synchronous detection optical system that controls a timing at which the light beams form images on the surfaces to be scanned. The synchronous detection optical system includes a synchronous detection element, at least one optical path changing unit, and at least one synchronous detection optical element, controlling the timing of the image formation on the surfaces to be scanned. The synchronous detection element is attached integrally onto a circuit substrate of other light source units arranged to oppose the light source unit with the deflecting unit therebetween. At least one synchronous detection optical element and the synchronous detection element are arranged to oppose each other with respect to a line perpendicular to lines connecting a deflection axis of the deflecting unit and optical axes of the imaging optical systems. COPYRIGHT: (C)2009,JPO&INPIT
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