Patent ID: 8867107
Filing Date: 2014-10-21
Classification: H04N

Abstract:
1. An image reading apparatus comprising: a transporting member that transports a document having an image formed thereon and causes the document to pass through a reading position; a light source that irradiates the document passing through the reading position with light; a light receiving unit that receives light emitted from the light source and reflected at the reading position so as to generate image information; a background member that is arranged at a position such that the document at the reading position is interposed between the background member and the light source, and that is inclined with respect to the document passing through the reading position such that, upon reflecting the light emitted from the light source toward the light receiving unit when the document is not present at the reading position, a difference between an incident angle of the light emitted from the light source and a reflection angle of light reflected toward the light receiving unit is less than a difference between an incident angle and a reflection angle on the document passing through the reading position; and an adjusting unit that adjusts a position or attitude of an acting member such that the light reflected from the background member is received with a greater intensity by the light receiving unit than light reflected from predetermined white paper passing through the reading position, the acting member acting on an intensity of the light reflected from the background member and received by the light receiving unit.