Patent ID: 7538789
Filing Date: 2009-05-26
Classification: G02B,H04N

Abstract:
1. An optical scanning device, comprising: a light source device having at least two light emitting members disposed spaced apart from each other in a main-scan direction; a rotary polygonal mirror configured to scanningly deflect at least two light beams emitted from said light source device; an input optical system configured to project the at least two light beams from said light source device onto said rotary polygonal mirror so that, within a sub-scan section, the at least two light beams are incident on a deflecting surface of said rotary polygonal mirror in an oblique direction with respect to a normal to the deflecting surface; and an imaging optical system configured to image, upon a surface to be scanned, the at least two light beams scanningly deflected by the deflecting surface of said rotary polygonal mirror; wherein said input optical system includes a converting optical element configured to transform a light beam from said light source device into a parallel light beam, wherein, when a maximum pivot angle of said rotary polygonal mirror for scanning an effective region on the scanned surface is denoted by θ is satisfied, and wherein the largest angle α [deg] of the oblique incidence angles in the sub-scan section of the at least two light beams incident on the deflecting surface of said rotary polygonal mirror satisfies a relation