| 摘要 |
To obtain an optical scanning device in which timing of a scanning start position on a surface to be scanned (hereinafter referred to as object surface) is stabilized and detection precision of a synchronous signal by a synchronous position detecting unit is improved, with the result that an image with higher definition can be obtained. The optical scanning device includes an aperture stop for limiting a light flux width of a plurality of light fluxes, an optical deflector for deflecting the light fluxes passing through the aperture stop, a scanning optical system for guiding the plurality of light fluxes deflected by the optical deflector onto an object surface, and a synchronous position detecting unit for detecting the plurality of light fluxes deflected by the optical deflector to obtain the synchronous signal, which includes a synchronous detection element, and in the optical scanning device, the synchronous position detecting unit further includes an imaging element and a synchronous position determining unit for determining a light flux position in a main scanning direction on the synchronous detection element disposed in an imaging position of the imaging element or vicinities thereof, and a conjugate point of the imaging element with the synchronous position determining unit is set between a deflection surface of the optical deflector and the aperture stop within a sub-scanning section.
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