Patent ID: 8208181
Filing Date: 2012-06-26
Classification: H04N

Abstract:
1. An image reading apparatus comprising: plural line image sensors aligned in a main scanning direction, the plural image line sensors aligned to read an image along scanning lines that include a partially overlapped reading portion, so that image data to be read are imaged on the line image sensors and entire image data are read by joining image data in the overlapped reading portion read by the line image sensors; plural light sources disposed so as to face the overlapped reading portion of the image data to be read by the line image sensors, the plural light sources aligned in a straight line extending in a direction substantially parallel to a sub scanning direction; a light source turn-on unit configured to sequentially and independently turn on the light sources; an optical unit configured to converge each light emitted from the light sources onto the overlapped reading portion; and a position shift detecting unit configured to detect 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 read by the line image sensors.