| 摘要 |
PURPOSE: An image reading and imaging optical system and an image reading apparatus thereof are provided to realize high speed and high resolution by scanning conveniently and integrally with a carriage in reading digital color image. CONSTITUTION: An image reading and imaging optical system for imaging image information on a line sensor(5) and reading the image information has an imaging optical element including a plurality of off-axial reflecting surfaces differing in the direction of incidence and the direction of emergence of a reference axis ray from one another and having curvatures. The chromatic aberration is reduced, and scanning is performed integrally with the carriage during reading the digital color image. The asymmetrical aberration is restricted, and degradation of the optical system is prevented.
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