Color image forming apparatus with pre-charging unit and potential adjustment unit
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United States of America Patent
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Nov 20, 2007
Grant Date -
Apr 27, 2006
app pub date -
Jul 18, 2005
filing date -
Oct 26, 2004
priority date (Note) -
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Abstract
A color image forming apparatus includes primary transferring units that transfer toner images of different colors from photoreceptors to an intermediate transfer body, a secondary transferring unit that transfers a color toner image from the intermediate transfer body onto a transfer material, a pre-charging unit placed downstream of the primary transferring units and upstream of the secondary transferring unit and that applies electric charge to the color toner image on the intermediate transfer body before the secondary image transfer with the polarity of the applied electrical charge identical to polarity of the potential of the toner, and a potential adjustment unit placed downstream of the pre-charging unit and upstream of the secondary transferring unit, and that applies an electric charge that has a polarity opposite to that of the potential of the toner to the color toner image on the intermediate transfer body.
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