| 摘要 |
A developer apparatus includes a developer carrying member, for carrying a developer to a developing portion, the developer carrying member including an electroconductive base and a resistance layer provided thereon; a developer feeding member for being supplied with a voltage to supply the developer to the developer carrying member; wherein a surface moving speed of the developer carrying member Vp [mm/sec], a resistance R1 (Omega) of the developer carrying member when an electric current applied the developer carrying member is 0.04Vp [muA], and a resistance R2 (Omega) or the developer carrying member when the electric current applied to the developer carrying member is 4Vp [muA], satisfy: r1/R2<15.
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