Image forming apparatus
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United States of America Patent
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Aug 8, 2017
Grant Date -
Jun 9, 2016
app pub date -
Nov 30, 2015
filing date -
Dec 3, 2014
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An image forming apparatus includes a rotatable photosensitive member (drum), a first corona charger, a second corona charger, an image forming portion, a voltage applying portion, a surface potential detecting portion, a controller. The controller determines a condition of voltages applied to the first and second corona chargers during image formation, by setting a first voltage condition for the first corona charger so that the surface potential of the drum is a second potential lower in absolute value than the first potential in a state in which the first corona charger operates, and the second corona charger does not operates, and then by setting a second voltage condition for the second corona charger so that the surface potential of the drum is the first potential in a state in which the first corona charger operates under the first voltage condition, and the second corona charger operates.
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