| 摘要 |
PURPOSE:To correct the quantity of an output signal with a simple and low-cost means by using lighting light distributions on an original face to correct the output signal from photodetectors in an original reader providing plural photodetectors to a device reading optical flux from different positions on the original. CONSTITUTION:The illuminance of lighting light flux is made intensively different in each position of an original platen where a light source lighting an original is brought to one side and at a conjugate position in terms of light with respect to a solid-state image pickup element 6 and an image forming lens 4. The solid-state image pickup element receiving the luminous flux of a region R having a large detection signal is arranged in a position being optically conjugated with a region having a low illuminance on the platen with respect to the image forming lens 4, and conversely, the solid-state image pickup element receiving a luminous flux of the region B having a small detection signal is arranged to be in optical conjugate with the region having a high illuminance on the platen with respect to the image forming lens 4. The illuminance of the solid-state image pickup element detecting the luminous flux of the region G receiving a detection signal having an intermediate value is in conjugate relation with that of the region of the original platen having an intermediate illuminance.
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