Patent ID: 8675036

Claim:
An optical scanning apparatus comprising: first and second light sources which emit first and second laser lights, respectively; a deflection scanning device for deflecting the first and second laser lights for scanning; and first and second scanning optical systems which are provided on opposite sides with regard to the deflection scanning device, wherein the first and second scanning optical systems guide the first and second laser beams which have been deflected for scanning by the deflection scanning device, to corresponding surfaces to be scanned, respectively, wherein each of the first and second scanning optical systems comprises a scanning lens arranged in a downstream side of an optical path of the deflection scanning device, and a polarization beam splitter arranged in a downstream side of an optical path of the scanning lens, wherein the first scanning optical system comprises a half-wave plate arranged in the downstream side of the optical path of the scanning lens and in an upstream side of an optical path of the polarization beam splitter, and wherein the first laser beam and the second laser beam before being incident on the first and second scanning optical systems have different phases by 180 degrees from each other.