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US 5,101,284 AGranted
Shading corrections device with white color reference member peripherally providined proximate to a platen roller for feeding an original document over a glass platen
AssigneeFuji Xerox Co., Ltd.
InventorEiichi Tanabe
Life of this patent
Estimating the term…
Abstract
In a shading correction device of an image reading machine, for example, a Xerography unit or a thermal transfer unit, a platen roller is provided so as to engage and disengage from a platen glass. A reference white color member is provided. The reference white color member is movable up to a position between the platen glass and the platen roller along the circumferential side of the platen roller and with rotation of the platen roller.
Claims8
A shading correction device for correcting shading of an image copied form an original on a platen glass o a copy machine, said shading correction device comprising:
- a platen roller provided adjacent to said platen glass for carrying said original in a predetermined direction whereby said original engages with or disengages from said platen glass;
- and
- a reference white color member peripherally provided proximate said platen roller, said reference white color member being movable to a position between said platen glass and said platen roller in response to rotating of said platen roller.
Dependencies are inferred from the claim text.