| 摘要 |
PROBLEM TO BE SOLVED: To provide a pretransfer charging device, which allows reduction of generation of discharge products such as ozone and nitroxide, excellent uniform charging, continuous stable charging for a long period of time, and restraint of distortion of a toner image. SOLUTION: The pretransfer charging devices 2 and 3 include ion generation needles 21 each provided face to face with an image carrier such as a photoconductor drum 1 or an intermediating transfer belt 15, and a high-voltage power supply 25 for applying a negative voltage to each of the ion generation needles 21. The voltage to be applied from the high-voltage power supply 25 is not less than an ion generation threshold voltage but is less than a corona discharge threshold voltage. With this, no corona discharge occurs but negative ions can be generated. This makes it possible to solve various problems caused due to the corona discharge. COPYRIGHT: (C)2008,JPO&INPIT
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