Patent ID: 6892945
Filing Date: 2005-05-17
Classification: H04N

Abstract:
1. An image reading apparatus comprising: an illumination unit adapted to illuminate a subject; an image reading unit having a line sensor adapted to read an image of the subject illuminated by said illumination unit; a transparent member having a light transmitting property provided between the subject and said image reading unit; a reference member, which is provided on said transparent member and extends in a main scanning direction of said line sensor, on a side that the subject is to be placed, adapted for use as an illuminance reference for shading correction applied to an image signal that is output from said image reading unit; and a light shielding member provided along said reference member in contact with said transparent member on the other side of the transparent member that said reference member is provided, so as to prevent light, which enters from outside through said transparent member, from being incident on said reference member when the line sensor reads said reference member.