Patent ID: 7508563

Claim:
An optical scanning device, comprising: at least two light source devices; a deflecting device having a plurality of deflecting surfaces; an input optical system configured to direct at least two light beams emitted from said at least two light source devices, onto different deflecting surfaces of said deflecting device; and a plurality of imaging optical systems configured to image the at least two light beams scanningly deflected by the different deflecting surfaces of said deflecting device, upon corresponding scan surfaces to be scanned, respectively; wherein the scan surfaces are simultaneously scanned by said deflecting device; wherein each of said plurality of imaging optical systems includes at least one transmission type imaging optical element and at least one reflection optical element, wherein each of the at least two light beams scanningly deflected by the different deflecting surfaces of said deflecting device passes through the at least one transmission type imaging optical element constituting said imaging optical system and is thereafter reflected by the at least one reflection optical element and, subsequently, it passes again through the transmission type imaging optical element, and wherein, after passing again through the transmission type imaging optical element, the at least two light beams scanningly deflected by the different deflection surfaces of said deflecting means intersect with each other within a sub-scan section.