| 摘要 |
PROBLEM TO BE SOLVED: To stably form a uniform-thickness toner layer on a developing roller by a toner regulation roller. SOLUTION: When developing bias voltage applied to the developing roller 5 is defined as VB (V), the DC voltage of toner supply bias voltage being the voltage obtained by superimposing the DC voltage and the AC voltage and applied to a toner supply roller 6 is defined as VSDC (V) and the DC voltage of toner regulation bias voltage being the voltage obtained by superimposing the DC voltage and the AC voltage and lied to the toner regulation roller 27 is defined as VRDC (V), the relation of 100<VB-V SDC<300 and -50<VB-VRDC <50 are established in the case that negatively electrifiable non-magnetic one- component is used. In the case that the positively electrifiable non-magnetic one-component developer is used, the relation of 100<VSDC-VB<300 and -50< VB-VRDC<50 are established. |
