| 摘要 |
A developing device including a developing roller facing an image bearing member and a toner layer thickness control member to control an amount of a toner adhered to the developing roller, so that an electrostatic latent image formed on the image bearing member is developed with the toner to form a toner image. The following relationships are satisfied: 0.08×100.3×Dv<Ra<0.18×100.3×Dv, 2.0<(Ra/RSm)×100<4.0, and 8<Rz<15, where Dv (μm) is a volume average particle diameter of the toner, Ra (μm) is an arithmetical mean roughness of the developing roller in a longitudinal direction, Rz (μm) is a ten-point mean roughness of the developing roller in a longitudinal direction, and RSm (μm) is a mean length of roughness curve elements of the developing roller. |
