Patent ID: 7920304
Filing Date: 2011-04-05
Classification: G03B,H04N

Abstract:
1. An image reading apparatus comprising: a plurality of light sources to illuminate a document; an illumination optical system to guide light emitted from the plurality of light sources to a reading target area in a substantially rectangular shape having a length and a width; a document illuminating device which is moved in a direction of the width to illuminate the entire document; an image forming optical system to image light reflected from the document; and a sensor provided in an image forming section of the image forming optical system to read the image of the document, wherein the illumination optical system includes a concentration section to control light diffusion, and a reflection section to illuminate the document by light from a plurality of directions, wherein the reflection section includes at least two integrally configured reflection surfaces, in which a sine value of an angle of light reflected from at least one reflection surface is positive, while a sine value of an angle of light reflected from the rest of at least one reflection surface is negative, with the angle of the reflected light referring to an angle formed when the light reflected from the reflection surface is angled to a virtual plane, which includes the reading target area and is perpendicular to the width direction, and with either side with respect to the virtual plane being set to be positive.