Image reader for use in image forming apparatus

Details Image reader for use in image forming apparatus Image reader for use in image forming apparatus

2004-06-29

2008-11-04

Lee, Cheukfan (Department: 2625)

Facsimile and static presentation processing

Facsimile

Picture signal generator

C358S461000, C358S496000, C358S497000

Reexamination Certificate

active

07446909

ABSTRACT:
The image reader according to the present invention is able to set the accurate threshold level free of influence of dirt and dust even when the reference “white” level is requested for shading correction during the acceleration while the carriage is being accelerated without increasing the averaging frequency when the reflected light from the white board is read for shading correction. In addition, because the distance between the head end of the transparent glass and the home position as well as the distance between the home position and the reading window are shortened, the size of the image reader is reduced.

REFERENCES:
patent: 5107344 (1992-04-01), Nosaki et al.
patent: 5453850 (1995-09-01), Akuzawa et al.
patent: 5864408 (1999-01-01), Kumashiro
patent: 5978614 (1999-11-01), Takeuchi
patent: 6606464 (2003-08-01), Asakawa
patent: 6650854 (2003-11-01), Sone
patent: 6771397 (2004-08-01), Hashizume
patent: 9-74465 (1997-03-01), None

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