| 摘要 |
PROBLEM TO BE SOLVED: To suppress the occurrence of harmful light and to miniaturize a unit by positioning an optical axis connecting a mirror near the incident face of an image forming lens among a plurality of mirrors, the image forming lens and a reading means to be almost parallel to an original face and in the lowest part of a unit and arranging the mirror being the nearest to an original face-side in a space between the lowest optical axis and the original face. SOLUTION: An incorporated scanning optical system unit 5 moves in a scanning direction and it folds luminous flux from an original 3 by the illumination of a light source 6 and a reflector 7 by mirrors 8-12 and an image is formed in a reading means 14 by an image forming lens 13. A luminous flux L3 connecting the mirror 12, the image forming lens 13 and the reading means 14 is made to be almost parallel to the original 3 face and it is positioned in the lowest part of the unit 5. The mirror 8 is arranged in the almost middle part of the optical axis L3 between the optical axis L3 and the original 3 face. A luminous flux restriction slit 15 installed between the mirrors 11 and 12 corrects shading and corrects the irregularity of light quantity distribution on an image forming face. Thus, the occurrence of ghost and flare is suppressed and the unit 5 can be miniaturized.
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