Patent ID: 7349132
Filing Date: 2008-03-25
Classification: H04N

Abstract:
1. An image reading apparatus comprising: an illumination unit including a lamp to incorporate a change in temperature conditions to the emitting light amount, the lamp extending in a predetermined direction and having a predetermined length, the lamp illuminating a reading object to obtain the reflected light from the reading object; a first control unit which changes the capacity of the lamp of the illumination unit to illuminate the reading object; an image signal generation unit which generates an image signal by opto-electrically converting the reflected light; an optical unit which inputs the reflected light to the image signal generation unit; a second control unit which operates the image signal generation unit; a white reference marker which provides a reference for shading correction and illuminance of an illumination light to illuminate the reading object; an image processing unit which compensates a fluctuation in an image signal caused by any one of or all of the image signal generation unit, the illumination unit and the optical unit, and performs shading correction of the output of the image signal generation unit to set a reference for the output level of the image signal generation unit; a cooling unit which cools the lamp of the illumination unit; a third control unit which operates the cooling unit; and a control amount setting unit which sets the cooling amount when operating the cooling unit by the third control unit, and gives an instruction to the third control unit.