| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a spotted image defect while realizing the miniaturization of a device by optimizing the constitution of the end part of a developer carrier. SOLUTION: A rough surface worked part 5 worked to be a rough surface in order to carry developer is provided on the peripheral surface of the developer carrier 2, and a thin layer area regulating position J by a thin layer area regulating member 4 is set on the outside from the worked part 5. The developer carrier 2 has a magnetic field generating member 3 in which a plurality of magnetic poles are arrayed, and the end in the width direction of a developing magnetic pole 3a served to the development of at least the member 3 is set to be the same as the end in the width direction of recording material of maximum use size or set on the inside from the end in the width direction, and the thin layer area regulating position by the member 4 is set on the inside from the end in the width direction of at least the developing magnetic pole 3a of the member 3. |
