| 摘要 |
An optical scanning device which corrects rotation distortion around an optical axis of the light beam is provided while a housing is reduced in site and is arranged to be manufactured accurately. The optical scanning device includes a pre-deflection optical system that shapes a light beam emitted from a light source into a predetermined sectional shape, a polygon mirror that deflects an incident light beam with plural reflection surfaces arrayed in a rotating direction and scans the light beam on a scanning object, and a folding mirror that deflects the light beam, which is shaped by the pre-deflection optical system, with a reflection surface and guides the light beam to the reflection surfaces of the polygon mirror. The reflection surfaces of the polygon mirror and the reflection surface of the folding mirror have a position relation for correcting rotation distortion around an optical axis of the light beam, which is shaped by the pre-deflection optical system, caused when the shaped light beam is deflected by the folding mirror.
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