| 摘要 |
PURPOSE:To attain miniaturization and reduction in the cost while satisfying request that speed is increased (improvement of developability) in particular, with respect to a type using a two-component developer. CONSTITUTION:In the type to provide a developer carrier 1 having a magnet member 3 fixedly installed in a rotatable nonmagnetic sleeve 2, at least three or more developing main poles 5 (for instance, 5a, 5b and 5c) whose polarities are alternately different are oppositely arranged in a region where the developing carrier 1 faces the surface of a latent image carrier 4 and developing auxiliary poles 6 (for instance, 6a and 6b) for generating a behavior accelerating magnetic field component SF, for locally distracting the developer G on the developer carrier 1 and quickly sliding the developer G in the peripheral direction of the carrier 1 in a developer distracting region K are arranged in the working region of a horizontal magnetic field component SH in the peripheral direction of the carrier 1, which is formed on the almost center between the adjacent developing main poles 5 (5a, 5b and 5c). |
