Patent ID: 7557974
Filing Date: 2009-07-07
Classification: G02B

Abstract:
1. An optical scanning apparatus, comprising: a light source unit; an incident optical system for guiding a light beam emitted from the light source unit to a deflecting unit; and an imaging optical system for imaging the light beam deflected by the deflecting unit onto a surface to be scanned, wherein the following conditions are satisfied, where W (mm) represents an effective scanning width on the surface to be scanned, L (mm) represents an interval in an optical axis direction of the imaging optical system between a deflecting surface of the deflecting unit and the surface to be scanned and Sd (mm) represents an interval between the deflecting surface of the deflecting unit and a natural convergent point, wherein the imaging optical system is constituted by a single imaging optical element LR, and wherein a scanning field angle region changes from a region in which |θ