| 摘要 |
PROBLEM TO BE SOLVED: To provide a developing device forming a good image by preventing the occurrence of a deterioration in a developer caused by unevenly distributed developer and by the developer concentrated in the vicinity of a developer restriction member, of the accompanied or stayed developer on a developing sleeve, and of a poor picture including irregular intensity, as a developing device employing a light negative pole configuration in which circulating means for agitating, transporting, and circulating the developer are arranged at the upper and lower parts in the vertical direction. SOLUTION: The interior of a first developer carrier 8 is provided with a first magnetic field generating means 8' having: a first magnetic pole N3 at the downstream of a developing region in the moving direction of the first developer carrier 8 and a second magnetic pole N1 having the same polarity as that of the first magnetic pole N3 and disposed adjacent to the downstream side of the first magnetic pole N3 in the moving direction of the carrier 8. A developer control member 9 is disposed in the vicinity of a position opposed to the second magnetic pole N1. A rotatable second developer carrier 11 is provided at the downstream of the developing region in the rotating direction of the first developer carrier 8. The developer T having passed through the developing region is delivered from the first developer carrier 8 to the second developer carrier 11. COPYRIGHT: (C)2004,JPO |
