| 摘要 |
A developing device includes a developing container unit configured to contain and circulate a developer, and a plurality of developer carrying members each for carrying on its surface the developer for developing an electrostatic latent image on an image bearing member. The developer carrying member providing a largest difference in driving torque measured before and after being coated with a toner on its surface thereof is provided with a plurality of circumferentially spaced grooves, and the remaining developer carrying member has a blast-treated surface. |
