OPTICAL SCANNER AND ELECTROPHOTOGRAPHIC DEVICE EQUIPPED THEREWITH

摘要

PROBLEM TO BE SOLVED: To provide an optical scanner made compact and capable of securing the positional accuracy of an optical system lens. SOLUTION: An image-formation optical system of an optical unit 5 being the optical scanner is constituted of a 1st lens 114 through which a light beam 105 deflected to perform scanning passes, a mirror 119 folding an optical path of the light beam 105 passing therethrough, and a 2nd lens 115 arranged at an upper part of the lens 114 so that it may be superposed on at least one part of the lens 114 and forming the folded light beam 105 into an image as a spot on a surface to be scanned 201.