Image reading apparatus

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;
• a first reference member that is disposed in a region where the transparent member is exposed as an outer surface of the document placing table and serves as a luminance reference of the image reading unit;
• and
• a second reference member that is disposed in a region other than the region where the transparent member is exposed as the outer surface of the document placing table and serves as a luminance reference of the image reading unit,
• wherein, when the open/closed state detecting unit detects the closed state of the document pressing member, the control unit moves the scanning unit to a position facing the first reference member, and performs an output adjustment of the image reading unit about the first reference member, and
• when the open/closed state detecting unit detects the open state of the document pressing member, the control unit moves the scanning unit to a position facing the second reference member, and performs an output adjustment of the image reading unit about the second reference member.