Patent ID: 7800797

Claim:
A document reading apparatus comprising: a carriage, including an image reading sensor for reading an image from a document, and adapted to reciprocate in a predetermined range along a predetermined direction; contact portions, disposed at both ends of the predetermined range, wherein the carriage comes in contact with the contact portions so that a movement of the carriage is regulated; a judgment section, operable to judge whether the carriage comes in contact with the contact portions; a positional information temporary determining section, operable to temporarily determine positional information of the carriage when the judgment section judges that the carriage comes in contact with one of the contact portions; and a positional information check section, after the positional information is temporarily determined by the positional information temporary determining section, operable to check whether the positional information is correct based on a moving distance of the carriage from a first position where the judgment section judges that the carriage comes in contact with the one of the contact portions to a second position where the judgment section judges that the carriage comes in contact with the other of the contact portions, and operable to determine the positional information when it is confirmed that the positional information is correct, wherein after the positional information is temporarily determined by the positional information temporary determining section, when the carriage moves from the first position to the second position, the carriage moves to a third position where the carriage starts to move before the positional information is temporarily determined by the positional information temporary determining section, at a moving speed greater than a moving speed at which the carriage moves before the positional information is temporarily determined by the positional information temporary determining section.