| 摘要 |
PROBLEM TO BE SOLVED: To provide a developing device in which the occurrence of an image defect such as density unevenness is prevented by reducing the uneven density of a developer and supplying the developer to a developer carrier uniformly in an axial direction. SOLUTION: The developing device is provided with a first magnetic field generating means which is at the downstream side in the rotating direction of a developing sleeve (developer carrier) 8 from a development part and in a development container 2, a second magnetic field generating means which is at the downstream side in the rotating direction of the developing sleeve 8 of the first magnetic field generating means and has the same polarity as that of the first magnetic field generating means, a region (repelling pole) having a magnetic field strength Br of 10 mT or less in the vertical direction of the developer carrier surface between the first and second magnetic field generating means a first transportation screw (first developer agitation transport means) 5 which is positioned adjacent to the developing sleeve 8 in a downward region in the vertical direction of the first magnetic field generating means, and a second transportation screw (second developer agitation transport means) 6 which is positioned at the diagonal upper part of the first transportation screw 5 and transports the developer to the first developer agitation transport means in an opposite direction. |
