| 摘要 |
First and second scanning and reading systems are arranged on the both sides of the document transport path. The image reading region by the first scanning and reading system is positioned on an upstream side of an image reading region by the second scanning and reading system. The document images on the surfaces are read while illuminating with light from light sources of the scanning and reading systems the main and back surfaces of the document being transported on the document transport path. Until the document image reading by the second scanning and reading system is ended, the light amount of the light source of the first scanning and reading system is maintained constant thereby preventing the reception-light amount in the second scanning and reading system from changing.
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