Patent ID: 6744540
Filing Date: 2004-06-01
Classification: H04N

Abstract:
A document end detecting unit which detects one of an upstream end and downstream end in a moving direction of a document moving relatively to a predetermined reference position, the document end detecting unit comprising:a light source for illuminating the reference position from a downstream side or upstream side in the moving direction of the document; light-receiving means for receiving reflected light coming through the reference position; a back member opposed to the light-receiving means and the light source across the reference position; and detecting means for detecting the one end of the document, wherein a slot whose longitudinal direction is substantially parallel to the moving direction of the document is provided on a surface of the back member, and the detecting means detects a shade of the one end of the document appearing at the slot of the back member based on a light-receiving result of the light-receiving means, and detects the one end of the document based on a result of detecting the shade.