Patent ID: 8896889

Claim:
A document scanning apparatus for scanning a document, the apparatus comprising: an image sensor unit which irradiates an incident light towards the document and generates image data by sensing a reflected light reflected from the document; a supporting unit which supports the image sensor unit; a movement unit which moves the image sensor unit between a scanning position and a calibration position; a housing which houses the image sensor unit, the supporting unit, and the movement unit, wherein the movement unit moves the image sensor unit between a scanning position and a calibration position without moving the housing, and wherein the scanning position is different from the calibration position; a transparent plate which transmits the incident light and the reflected light; a calibration sheet which is attached to a surface of the transparent plate which is exposed to outside, the calibration sheet being positioned in an area including the calibration position; and a housing cover which is coupled to the housing and seals inside of the housing, wherein the document scanning apparatus is configured to be positioned in an automatic document feeder.