| 摘要 |
PROBLEM TO BE SOLVED: To effect the reading of image data of four channels (corresponding to four basic colors) without resulting in an increase in the construction of an A/D conversion circuit for three channels (corresponding to three basic colors). SOLUTION: In an image reading apparatus provided with photoelectric conversion elements arrays 401a-401d capable of resolving an inputted optical signal into four basic colors and outputting them as analog electrical signals, and an A/D conversion circuit 407 capable of inputting three analog electrical signals at a time, three or less analog electrical signals are selected from the photoelectric conversion element arrays 401a-401d at the image reading of one main scanning line and also, a different combination of analog electrical signals are selected at the image reading of two adjacent main scanning lines, and the selected analog electrical signals are outputted to the A/D conversion circuit 407. COPYRIGHT: (C)2006,JPO&NCIPI
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