Patent ID: 7369282

Claim:
A document reading device comprising: document transport means for transporting a document; optical reading means for reading a document image, said optical reading means being provided with a movable exposure member which stops at a predetermined reading position and emits light onto the document; support means for supporting the document being transported by the document transport means when the document passes over the reading position; a guide member, formed in a predetermined inclination angle with respect to a flat-plate face of the support means, which serves as a guide face for guiding the document to the reading position; and a transport path forming member for forming a transport path with the support means so that the document which passes over the reading position can be transported along the flat-plate face of the support means; wherein the optical reading means detects a leading end position, in a transport direction, of the guide member, and the predetermined reading position is set within a range of predetermined distance in a transport direction from the leading end position, wherein the predetermined distance is known beforehand to be free from stains on said support member caused by a contact with the document.