Patent ID: 6064057
Filing Date: 2000-05-16
Classification: H04N

Abstract:
A color image reading apparatus comprising:light-receiving means in which a plurality of line sensors are arranged on a same substrate surface;an imaging optical system for forming an image of an object;a blazed diffraction grating disposed in an optical path between said imaging optical system and said light-receiving means, for color-separating a light beam from the object into a plurality of color light beams; andcorrection means, disposed in an optical path between said blazed diffraction grating and said light-receiving means, for correcting different imaging positions on a surface of said light-receiving means caused by different wavelengths of the plurality of color light beams color-separated by said blazed diffraction grating, said correction means changing respective optical paths of the color light beams utilizing different refractive indices due to different wavelengths upon being transmitted through said correction means so as to make spacings between adjacent color light beams color-separated in a sub scanning direction equal to each other on the surface of said light-receiving means.