| 摘要 |
PROBLEM TO BE SOLVED: To provide an illumination unit which suppresses the variation of the color tone of a plurality of light sources, with a simple configuration and to provide an image reader provided with the illumination unit and an image forming apparatus provided with the image reader. SOLUTION: In the illumination unit 62 configured so that the plurality of light sources 76 emitting illumination light toward a document surface 64a are arranged like a line, when a distance between the optical axes Z of the adjacent light sources 76 is expressed by L, the area of the document surface 64a illuminated in the arrangement direction of the light sources by the light sources 76 is expressed by A, the light-emitting angle of the illumination light from the light sources 76 is expressed byα, the color difference of the illumination light corresponding to the light-emitting angle in the chromaticity coordinate X of an XY coordinate system is expressed by▵X, and the color difference of the illumination light corresponding to the light-emitting angle in the chromaticity coordinate Y of the XY coordinate system is expressed by▵Y, the illumination range A is irradiated with the illumination light at the light-emitting angleαwhose color differences of▵X and▵Y are≤0.02 and L≤A is set. COPYRIGHT: (C)2009,JPO&INPIT
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