Electrophotographic image forming apparatus
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United States of America Patent
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Aug 12, 2014
Grant Date -
May 2, 2013
app pub date -
Oct 15, 2012
filing date -
Oct 28, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
An image forming apparatus forms a first patch with a light amount obtained by reducing a target light amount of a light amount control unit by a predetermined percentage, and forms a second patch with a light amount obtained by a shading control unit reducing the target light amount by the predetermined percentage. Furthermore, the image forming apparatus determines a correction coefficient that is used for modification data for each scanning position in common so that there is no error between a detected value of the first patch and a detected value of the second patch.
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