Patent ID: 6469774
Filing Date: 2002-10-22
Classification: H04N

Abstract:
An image reading apparatus comprising:an illumination unit adapted to illuminate an original placed on an original glass table; a reading unit; and an imaging optical system for focusing a light beam based on image information of an original surface illuminated with said illumination unit on a surface of said reading unit, wherein said reading unit is not perpendicular to an optical axis of said imaging optical system, and the following condition is satisfied: &thgr;i&gE;sinâˆ’1(NAi) where &thgr;i is the tilt angle of said reading unit with respect to the optical axis of said imaging optical system, and NAi is the numerical aperture of said imaging optical system on a reading unit side, said image reading apparatus substantially preventing streaks of white flare from being generated by multiple reflection between said original surface and said surface of said reading unit.