Patent ID: 7511862
Filing Date: 2009-03-31
Classification: H04N

Abstract:
1. An image reading apparatus for reading an image of a sheet to be transferred, and applying a prescribed image processing to image data read to output processed data, comprising: a transfer means for transferring the sheet placed on a feed tray; a reading means for reading the image of the sheet transferred by said transfer means at a prescribed read position; a light volume detection means arranged at one side end in a direction perpendicular to a transfer direction of the sheet to be transferred to detect a light volume according to a deviation amount of an end of the sheet at a sheet transfer position in a direction perpendicular to said transfer direction of said sheet, and an operation means for calculating the deviation amount of the sheet at the sheet transfer position with respect to a reference position from a difference between a light volume detected by said light volume detection means when the sheet is not present at the sheet transfer position and the light volume detected by said light volume detection means when the sheet is transferred to the sheet transfer position.