Image forming apparatus
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United States of America Patent
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Jan 3, 2017
Grant Date -
Sep 8, 2016
app pub date -
Mar 2, 2016
filing date -
Mar 6, 2015
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Voltages are applied to an image bearing member using at least three application voltage values which are larger than a discharge start voltage value and which have different magnitudes, at least one of the application voltage values having a value at which a direction of a current corresponding to the one of the application voltage values is reverse to those of currents corresponding to the other application voltage values. A relation between the application voltage value and the detection current value in a discharge area is calculated based on at least three application voltage values Vd1, Vd2, Vd3 and at least three detection current values Id1, Id2, Id3 detected by a current detection portion in relation to at least three application voltage values Vd1, Vd2, Vd3 and a voltage value V0 at which the detection current value is zero is calculated based on the relation in the discharge area.
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