| 摘要 |
PROBLEM TO BE SOLVED: To provide a developing device without gushing of developer and excellent in start-up of electrification and replenishment. SOLUTION: In the developing device, a nonmagnetic and one-component developer to which an auxiliary agent is externally added as necessary is supplied to a developer carrier 30 which is rotationally driven and has <=10<13>Ω.cm conductivity, by a developer supplying member 40 having <=10<6>Ω.cm conductivity, so that the developer is held on the surface of the developer carrier 30, and is carried. A latent image carrier makes a formed electrostatic latent image to be a visible image with the developer carried on the developer carrier 30, in a developing region where the latent image carrier and the developer carrier are face-to-face with each other. In such a case, a toner partition member 50 having <=10<12>Ω.cm conductivity is abutted on the developer supplying member 40 and a potential difference is provided between the developer supplying member 40 and the partition member 50, so that the relation between the potentials (V1 ) and (V2 ) of the partition member 50 and the supplying member 40 is 200 v >=V1 -V2 >=0, when the polarity is negative and -200 v <=V1 -V2 <=0, when positive, according to the polarity of the charge of the developer. |
