| 摘要 |
PROBLEM TO BE SOLVED: To provide a developing device charging triboelectrically toner by low friction contact for realizing/maintaining stable system performance by preventing undesirable deterioration of the developer. SOLUTION: This low friction one component developing device 34 is provided with a sump 49 incorporating developer particles for feeding, a movable donor member assembly incorporating the donor member 42 transporting the developer particles to the developing zone, a first assembly 70 of AC bias and the DC bias generating the charged developer provided with the desirable polarity and electrostatic charge distribution by charging the developer particles in the sump, the second assembly 71 of the AC bias and the DC bias applied to the charged developer particles on the donor member 42 by imparting fringe electric field, the device 73 forming cloud of the developer in the developing zone for developing the latent image, and an electrostatic filter zone 80 eliminating the developer particle charged in wrong coding from the donor member arranged on the upstream of the developing zone by the electrostatic operation. |
