Image reading apparatus, document reading apparatus, and image forming apparatus

摘要

An image reading apparatus is disclosed that includes plural line image sensors partially overlapped with each other in an overlapped reading portion, the image reading apparatus characterized by: plural light sources disposed so as to face the overlapped reading portion; a light source turn-on unit sequentially and independently turning on the light sources; an optical unit converging each light emitted from the light sources onto the overlapped reading portion; and a position shift detecting unit detecting a position shift of a reading position of the line image sensors in the overlapped reading portion based on data of the overlapped reading portion.