Patent ID: 7209702
Filing Date: 2007-04-24
Classification: G03B,G03G

Abstract:
1. An original document size detecting apparatus, comprising: an original document table configured to hold an original document; an illumination device formed from a plurality of point light source elements and configured to illuminate the original document, said plurality of point light source elements being aligned in a main scanning direction beneath the original document table; a moving device configured to move the illumination device relative to the original document on the original document table; and a photo acceptance unit configured to receive light reflected from the original document, said photo acceptance unit including a plurality of pixels configured to react to the received light; wherein said point light source elements are divided into a plurality of blocks, and wherein each of said plurality of blocks is turned on and off in successive turns starting from a block corresponding to an original document minimum size to a block corresponding to an original document maximum size.