| CPC H04N 1/00816 (2013.01) [H04N 1/00702 (2013.01); H04N 1/233 (2013.01)] | 12 Claims |
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1. An image reading device comprising:
a first glass having a back surface and a front surface opposite to the back surface, wherein the front surface is configured to receive an original document;
a reading unit configured to read, from a back surface side of the first glass, the original document placed on the first glass in a scanning direction by using a sensor while moving in a movement direction;
an adjacent portion having an abutment portion that abuts a side surface of the first glass in the movement direction;
a white reference portion disposed on a front surface side of the first glass, having a width greater than a width of the sensor in the scanning direction and configured to be used to correct an image read by the reading unit; and
a black portion disposed on the front surface side of the first glass, adjacent to the white reference portion, and between the abutment portion and the white reference portion in the movement direction,
wherein an edge of the black portion at a white reference portion side in the movement direction serves as a position reference of the reading unit in the movement direction,
wherein, in a case that the edge is read by the reading unit, the reading unit extends over a boundary between the adjacent portion and the first glass to contact the adjacent portion and to contact the first glass, and
wherein, in a case that the white reference portion is read by the reading unit, the reading unit is in contact with the first glass without being in contact with the adjacent portion.
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