Patent ID: 6690497
Filing Date: 2004-02-10
Classification: B41J,G02B

Abstract:
A light scanner comprising:light-incident optical means for guiding light which has exited from a light source to a deflecting unit; and scanning optical means for forming an image on a scan surface using light deflected by the deflecting unit, wherein said scanning optical means includes a plurality of lenses, with at least one lens of said plurality of lenses having at least one aspherical surface whose shape changes asymmetrically from the optical axis of said at least one lens to either end of said at least one lens, wherein said light-incident optical means causes the light which has exited from the light source to be incident upon a deflecting surface of the deflecting unit obliquely from the optical axis of said at least one lens, the optical axis being within a main scanning cross-sectional plane, and wherein the at least one aspherical surface of said at least one lens is a tilted generating-line asymmetrical surface, in which an end of a surface nearer the light source is closer to the scan surface than an end of a surface disposed farther from the light source, with respect to the optical axis of said at least one lens.