Patent ID: 8614413
Filing Date: 2013-12-24
Classification: H04N

Abstract:
1. An image reading apparatus, comprising: a plurality of light sources arranged in a predetermined one direction; and an optical member to guide light emitted from the light sources to a reading target area of an original document surface, the optical member including a first reflective surface and a second reflective surface which are disposed to oppose each other at an angle, and the first reflective surface and the second reflective surface being planes; and wherein the optical member is a light guiding body having at least four planes comprising glass or an optical plastic, two planes within the four planes are disposed to be opposed to each other, and the two planes disposed to be opposed to each other are arranged to have a distance B′ between the planes on a side from which the light is emitted larger than a distance A′ between the planes on a side into which the light enters from the light sources; wherein the two planes disposed to be opposed to each other concentrate light diffusing in the perpendicular direction relative to the original document surface within the light emitted from the light sources; wherein the light guiding body has side planes on edge parts of a length direction of the two planes disposed to be opposed to each other; and wherein the side planes are disposed to be opposed to each other on both edge parts of the length direction of the two planes disposed to be opposed to each other, and the pair of opposed side planes is arranged to have a distance D′ between the side planes on a side from which the light is emitted larger than a distance C′ between the side planes on a side into which the light enters from the light sources.