Patent ID: 8228583
Filing Date: 2012-07-24
Classification: G02B,G03G

Abstract:
1. An optical scanning device that scans a target surface to be scanned with a light beam and writes image information onto the target surface to be scanned, the optical scanning device comprising: a light source unit that includes a light emitting unit composed of a laser light source emitting linearly polarized light inside a package member; a deflector that deflects a light beam emitted from the light emitting unit; a pre-deflector optical system arranged on an optical path between the light emitting unit and the deflector; and a scanning optical system that scans the target surface to be scanned with the light beam deflected by the deflector, wherein the pre-deflector optical system includes at least two parallel plate optical elements each composed of a transparent medium having an incident surface and an exit surface parallel to each other, the parallel plate optical elements being arranged to be tilted in inclination that is opposite to each other in a plane of polarization of the linearly polarized light.