Patent ID: 6229628
Filing Date: 2001-05-08
Classification: G06K

Abstract:
An image reading apparatus comprising:an original-document-mounting table;a light source unit for illuminating an original document placed on said original-document-mounting table, said light source unit moving along said original-document-mounting table;a scanning unit for scanning the original document illuminated by said light source unit, said scanning unit moving in conjunction with the movement of said light source unit during document reading;a line sensor for receiving light obtained through said scanning unit, said line sensor having a plurality of light receiving elements arranged in a line perpendicular to a direction relative to a moving direction of said scanning unit; andcorrection means for correcting a relative position between said light source unit and said scanning unit, said correction means correcting the relative position according to an output exclusively from right and left edges of said plurality of light receiving elements in the perpendicular direction when said scanning unit scans a plurality of lines with said light source.