Image reading apparatus and image reading system

Details Image reading apparatus and image reading system Image reading apparatus and image reading system

1997-07-25

2000-04-25

Williams, Kimberly A.

Facsimile and static presentation processing

Natural color facsimile

Scanning

358511, 2505781, H04N 146, H01J 4014

Patent

active

060550724

ABSTRACT:
In an image sensor which has a photoelectric conversion element group, an illumination device having light sources of at least three emission colors R, G, and B, an imaging lens, and the like, moire noise in a color output image is eliminated, the original reading time is shortened, and a cost reduction is attained. For this purpose, a sensor array (1) including a linear array of a plurality of photoelectric conversion elements, a lens array (2) for imaging an original image on the sensor array (1), an illumination device (3) using LEDs having emission colors R, G, and B, and a cover glass (4) are supported by and fixed to a frame (5). The conjugate length of the lens array (2) is set to fall within the range between the B and G emission wavelengths. An original pressed against the cover glass (4) is illuminated by the illumination device (3), and light reflected by the original is converted into electrical signals by the sensor array (1), thereby reading the original image.

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