Patent ID: 8503050

Claim:
An image reading apparatus comprising: a light source which irradiates an original with light; an imaging unit which images reflected light from the original via a reflecting optical system, wherein the reflected light is reflected from the original; and a photoelectric conversion unit which includes a plurality of photoelectric conversion elements arrayed in a predetermined direction and which converts, into an electrical signal, the reflected light imaged by said imaging unit, wherein said photoelectric conversion unit includes a plurality of photoelectric conversion elements for monochrome reading, wherein an optical filter is provided on said photoelectric conversion elements for monochrome reading, wherein each of said reflecting optical system and said optical filter has an end portion and a central portion in the predetermined direction, and wherein said optical filter suppresses light at a peak wavelength of said light source such that a difference between a first sensitivity in percent of an optical path via the end portion of said reflecting optical system and said optical filter and a second sensitivity in percent of an optical path via the central portion of said reflecting optical system and said optical filter is equal to or less than 5%.