| 摘要 |
A developing device includes a developer supporting member having an elastic layer and a surface layer covering the elastic layer for supporting developer; and a developer layer regulating member arranged to abut against the surface layer for regulating a layer thickness of the developer on the surface layer. The surface layer contains at least carbon black. The developer supporting member is configured so that the following equation (1) is satisfied when the surface layer has a dynamic friction coefficient μ between 0.4 and 0.9 (0.4≦̸μ≦̸0.9) and a ten-point average roughness Rz (μm) between 2 μm and 6 μm (2≦̸Rz≦̸6): 2≦̸C≦̸0.5×Rz+3   (1) where C is a content of the carbon black (weight parts relative to the surface layer of 100). |
