Image reading apparatus and control method thereof having an...

Details Image reading apparatus and control method thereof having an... Image reading apparatus and control method thereof having an...

2005-07-12

2005-07-12

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S226000

Reexamination Certificate

active

06917028

ABSTRACT:
The deterioration of read-image quality caused by LED color-tone variations is suppressed in a case in which a white-color LED illumination module is used as a light source of a color-image reading apparatus. The color-image reading apparatus includes an illumination module formed of a plurality of white-color LEDs arranged in a main-scanning direction; an image sensor such as a CCD; a unit for moving the original and the image sensor relatively in a sub-scanning direction; and an input masking unit. The illumination module is formed of LEDs having the same color-tone rank. The color-image reading apparatus also includes a setting unit for setting a color-tone rank for the illumination module, and a control unit, such as a CPU, for switching a parameter of the input masking unit according to the color-tone rank.

REFERENCES:
patent: 5592218 (1997-01-01), Ochiai et al.
patent: 09-214675 (1997-08-01), None

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