| 摘要 |
PURPOSE:To prevent a decrease in the reproducibility of a character picture, by moving a nonmagnetic member and a surface to be developed in the same direction for development where magnetic poles of the same polarity for producing repulsive magnetic fields come closer to the surface to be developed. CONSTITUTION:A fixed magnetic roll 15 and a rotating nonmagnetic material sleeve 16 are installed in a developing container DC; the magnetic pole arrangement of the magnetic roll 15 have five poles, i.e. developer conveyor magnetic pole N1, developer scooping-up magnetic poles S2 and S3, and developing magnetic poles S4 and S5, and the magnetic poles S4 and S5 are so magnetized that the same polarities are at a development position to a photosensitive drum 17. The developer carried by the magnetic pole N1 and scooped up by the magnetic poles S2 and N3 is specified to a constant amount by a doctor blade 18 and rubbed against the photosensitive drum surface. |
