Patent ID: 7453055

Claim:
An image reading apparatus comprising: a document placing table having a transparent member on which a document is placed; a document pressing member that is openably provided on the document placing table and covers the transparent member; an image reading unit that irradiates light from a light source onto the document and reads an image on the document based on reflected light; a scanning unit that is disposed on a side opposite to a document placing surface of the transparent member and reciprocates in a predetermined direction along the transparent member with the image reading unit mounted thereon; an open/closed state detecting unit that detects open and closed states of the document pressing member; a control unit that controls an image reading operation of the image reading unit and a reciprocation movement of the scanning unit; and a reference member that serves as a luminance reference of the image reading unit, wherein, when the open/closed state detecting unit detects the open state of the document pressing member, the control unit set a predetermined light intensity set value to a light intensity value of light irradiated from the light source at the time of image reading.