Color image forming apparatus
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United States of America Patent
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Oct 1, 2013
Grant Date -
Jan 12, 2012
app pub date -
Jul 5, 2011
filing date -
Jul 7, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A color image forming apparatus including a test pattern formation portion that forms test patterns of a plurality of colors in an image formation area in which images of the plurality of colors are formed on an image carrier and in an image non-formation area outside the image formation area on the image carrier, a detection portion that detects a shift of each of the test patterns of the plurality of colors formed in the image formation area and a shift of each of the test patterns of the plurality of colors formed in the image non-formation area, a computing portion that obtains, for each color, an offset value indicating an offset between the shift of the test pattern in the image non-formation area and the shift of the test pattern in the image formation area, and a storage portion that stores the offset value for each color.
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