IMAGE READING APPARATUS AND IMAGE FORMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To make it possible to prevent image quality degradation of an output image caused by a variation of a power supply voltage while suppressing power supply cost of an image sensor module having a plurality of channels.SOLUTION: A light receiving environment of a reference part of a single channel light quantity sensor corresponding to a terminal part of a main scanning area is kept at a constant state. A level correction part 853 corrects a level of detection data of each of all the single channel light quantity sensors in accordance with a deviation between a level of detection data of the reference part and a reference level L0 each time when an image sensor module outputs the detection data.SELECTED DRAWING: Figure 6