| 摘要 |
PROBLEM TO BE SOLVED: To provide an original reading and image forming optical system capable of easily realizing a carriage integral type scanning system in an original reading system such as a digital copying machine for which a high speed and a high resolution are requested, and an image reader using it. SOLUTION: The image forming optical system forms image information satisfying A/B>10 at the time of defining a length in a long side direction as A and the length in a short side direction as B on a prescribed surface. The image forming optical system is provided with a plurality of surface reflecting surfaces with a curvature and a diaphragm. At the time of defining a light beam passing through the center of the diaphragm and reaching the center of a final image forming surface as a reference axis light beam and the route as a reference axis, a plurality of the surface reflecting surfaces are arranged such that the reference axis is bent within a surface vertical to the long side direction and the reference axis crosses each other at least once. COPYRIGHT: (C)2004,JPO
|
