Patent ID: 8274716

Claim:
An image reading apparatus, comprising: reading means having a plurality of line sensors extending in a main-scan direction; an imaging optical system configured to image, on the line sensors, imagewise information of an original surface, said imaging optical system including at least one anamorphic optical surface having different powers in the main-scan direction and the sub-scan direction; scanning means configured to relatively scan the original surface and said reading means in a sub-scan direction to read the imagewise information of the original surface; and image correcting means configured to correct imagewise information of the original surface read by each of the line sensors, on the basis of an imaging-position-deviation correction amount of an image in the sub-scan direction corresponding to a reading position in the main-scan direction, calculated based on an imaging position deviation amount of an image in the sub-scan direction corresponding to the reading position in the main-scan direction upon the line sensors, as calculated from optical design value of said imaging optical system.