Image reader for reading an image recorded on an original

Details Image reader for reading an image recorded on an original Image reader for reading an image recorded on an original

2007-05-29

2007-05-29

Grant, Jerome (Department: 2625)

Facsimile and static presentation processing

Facsimile

Picture signal generator

C358S482000, C358S483000, C358S514000

Reexamination Certificate

active

10081242

ABSTRACT:
A CCD scanner is provided with a regulating circuit, which stores electric-current set values of LED elements of respective colors. The regulating circuit also stores desired values corresponding to optimum light amounts of the LED elements of the respective colors. By utilizing the electric-current set value and the desired value, binary search is performed for the LED elements every color. During the binary search, the light amount of the LED element is regulated, and an electric-current value thereof is determined so as to obtain the optimum light amount. By using the determined electric-current value, the LED element is turned on to read an image.

REFERENCES:
patent: 5475508 (1995-12-01), Maeshima et al.
patent: 5724152 (1998-03-01), Hayashi et al.
patent: 6438256 (2002-08-01), Rubin et al.
patent: 6650443 (2003-11-01), Izumi

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