Patent ID: 8665502
Filing Date: 2014-03-04
Classification: G03G,H04N

Abstract:
1. An image reading device comprising: a transport unit that transports a document having an image formed thereon to a reading position; a first correcting unit that is provided upstream of the reading position in a transport direction of the document and that corrects a skew of the document by coming into contact with a leading edge of the document; a radiating unit that radiates light to the document at the reading position; an image-information acquiring unit that acquires information of the image formed on the document on the basis of information of light reflected by the document; a reflecting unit that is provided opposite the radiating unit with the document interposed therebetween at the reading position and that reflects the light radiated from the radiating unit; a leading-edge detecting unit that compares a quantity of the light reflected by the reflecting unit with a quantity of the light reflected by the document so as to detect the leading edge of the document passing through the reading position; a skew-amount calculating unit that calculates a skew amount of the leading edge of the document detected by the leading-edge detecting unit; and a second correcting unit that corrects a skew of the image information acquired by the image-information acquiring unit on the basis of the skew amount of the leading edge calculated by the skew-amount calculating unit, wherein the image reading device switches between the skew correction by the first correcting unit and the skew correction by the second correcting unit on the basis of document information, the skew amount of the leading edge calculated by the skew-amount calculating unit, or user's selection.