Patent ID: 6556317
Filing Date: 2003-04-29
Classification: H04N

Abstract:
An image reading apparatus comprising:a plurality of photoelectric conversion elements arranged in a line shape; an illumination device having light sources of first, second, and third colors having longer emission wavelengths in the order named, for illuminating an original in a line shape; a lens array comprising a plurality of columnar lenses arranged in a line shape, said plurality of columnar lenses for imaging light from the original illuminated by said illumination device onto said plurality of photoelectric conversion elements; and a support member for supporting the original, wherein an optical distance from a center of the columnar lens to the photoelectric conversion element in a longitudinal direction of the columnar lens is set at Â½ of a first conjugate length of light having a wavelength longer than a peak value of the emission wavelength of the light source of the second color, and an optical distance from the center of the columnar lens to an original support surface of said support member is set at Â½ of a second conjugate length shorter than the first conjugate length.