Patent ID: 7969635
Filing Date: 2011-06-28
Classification: G02B

Abstract:
1. An optical scanning device, comprising: a light source configured to emit multiple light beams; an optical deflecting device having a reflection surface on which the multiple light beams emitted by the light source are incident and from which the multiple light beams are reflected to be deflected; a plurality of members to be scanned, each member to be scanned by one of the multiple light beams; multiple scanning optics systems, each of the multiple scanning optics systems configured to focus one of the deflected multiple light beams on a surface of the member to be scanned while scanning the surface with the focused one of the deflected multiple light beams in a main scanning direction; and multiple glass plates located between the multiple scanning optics systems and the members to be scanned and disposed on light paths of corresponding light beams, each of the glass plates having no refracting power in the main scanning direction and a sub-scanning direction perpendicular to the main scanning direction, and slanted at a slanting angle relative to an axis perpendicular to the light path of the corresponding light beam, wherein the multiple light beams include two or more light beams having different incidence angles in the sub-scanning direction relative to a normal line of the reflection surface, and the slanting angles of the glass plates are determined depending on the incidence angles of the corresponding light beams passing through the glass plates.