Patent ID: 6623131
Filing Date: 2003-09-23
Classification: G02B

Abstract:
An reading optical system that forms an image of an original document on an one-dimensional imaging element, comprising:multiple reflective surfaces only as optical surfaces with a focal power, wherein at least one of the reflective surfaces is a free-form surface which has a symmetrical surface relative to a main scanning direction and has no symmetrical surface relative to a sub scanning direction, and wherein each reflective surface is arranged such that they are tilted relative to Y-axis, wherein Z-axis extends along an incident light beam, which is the axial main light beam that passes through a center of the original document and a center of an aperture and strikes a first reflective surface, the Y-axis extends along length of the one-dimensional imaging element, and X-axis extends perpendicular to the Y-axis and the Z-axis.