| 摘要 |
PROBLEM TO BE SOLVED: To prevent color slurring in reading of an image in a subscanning direction due to the difference in the afterglow characteristic of each color by reducing the centroidal movement of read positions of each color in the subscanning direction caused which depends on the afterglow characteristic of a white light source. SOLUTION: This image reader is provided with a centroidal movement reducing means that reduces the centroidal movement of read positions of each color in the subscanning direction generated, depending on the a characteristic of a while light source. The centroidal movement reducing means conducts reduction control, based on data of a luminous quantity emitted from a while light source and sets the reduction control in the unit of scanning and based on light emission data up to (N-1)-th scanning, after the operation of reading start for the N-the (N is an integer being 1 or over) setting. in this case, the light emission area is brought into the center of Hsync to share the persistent luminous amount to a front side and a rear side in the light emission region, thereby averaging the persistent luminous quantity and making the centroidal movement due to the decay characteristic very small. A circuit 18 of the reader delays the output of a circuit 16 for an arbitrary time, based on a setting value from a CPU 17 (so that the light emitting region comes to the center of the Hsync).
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