| 摘要 |
PROBLEM TO BE SOLVED: To provide a developing device capable of preventing an adverse effect on developability and fixing of toner on a charging member and capable of reducing fog, by applying an appropriate amount of charges to toner regardless of whether its chargeability is low or adequate. SOLUTION: The developing device 10 having a voltage application member 18 that is in contact with, via a toner layer, a developing roller 14 rotated holding a toner layer on its circumferential face. In the developing device 10, a voltage applied to the toner layer by the voltage application member 18 is switched between an AC voltage and a DC voltage based upon humidity or cumulative driving time. COPYRIGHT: (C)2006,JPO&NCIPI |
