Light scanner and image formation apparatus therewith

摘要

A light scanner has a light source 1 of a two-dimensional array consisting of a plurality of light source elements, a coupling lens system 2 for collimating a light flux from the light source 1, a shaping lens system (cylindrical lens 4 and lens 5) for shaping the light flux, light beam deflection means 6 for deflecting and scanning the post-shaped light flux, and a scanning lens system 7 for forming an image of the deflected and scanned light flux on a scanned medium 8. Assuming that the focal length of the coupling lens system 2 is f, a slit 3 for limiting the subscanning direction width as a member for shielding a part of the light flux is placed at a location at a distance of about f from the coupling lens system 2 in an opposite direction to the light source 1.