Image reading apparatus

Details Image reading apparatus Image reading apparatus

H - Electricity

04

N

178/3

H04N 1/00 (2006.01) H04N 1/04 (2006.01) H04N 1/407 (2006.01) H04N 1/48 (2006.01)

Patent

CA 2015426

ABSTRACT OF THE DISCLOSURE An image reading apparatus in which automatic gain control is performed comprises a integral reading unit, integrated with an optical system having a light source for irradiating an original, a rod lens array for focusing an image, and a line image sensor for reading the image, and a white reference plate, as a reference image upon reading of the image, being attached on one end of reading unit so as to move together therewith. There is effect in that one and the same portion of the white reference plate is read by the line image sensor so that the gain control can be made on the basis of the output of the line image sensor. Further even if a part of the white reference plate becomes dirty, an even output can be obtained throughout the whole surface of the original to thereby make it possible to prevent deterioration, such as generation of transversal stripes, from occurring in the output picture.

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