Patent ID: 6556332
Filing Date: 2003-04-29
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 the deflected light, wherein the scanning optical means comprises at least a first lens and a second lens, with the first lens being a meniscus positive lens whose concave surface faces the deflecting unit within a main scanning cross-sectional plane, and with the second lens being a meniscus lens whose convex surface faces the deflecting unit within the main scanning cross-sectional plane, wherein the shape of a light-incident surface of the second lens within the main scanning cross-sectional plane is such that the curvature changes from convex to concave from the optical axis of the second lens to either end of an effective portion of the second lens, and wherein portions of a surface of the second lens at either end of an effective portion of the second lens are disposed closer to the deflecting unit than a portion of the surface of the second lens at an apex thereof on the optical axis of the second lens.