| 摘要 |
PROBLEM TO BE SOLVED: To obtain a developing device which can suppress contamination on the surface of a developer carrying body while developer carrying property of the developer carrying body is maintained, by controlling the average slope of a developer carrying body as the parameter of surface roughness to a specified range and controlling the magnetic force peak a magnetic force generator in the hollow part of the developer carrying body to a specified range. SOLUTION: The surface slope of the developing sleeve 2 is controlled to 0.001 to <=0.1, and the N1 pole of a magnet 6 is disposed in the position at 0 to 15 deg. from the carrying amt. regulating space 7 in the upstream side of the rotation direction of the developing sleeve 2. Or, the S2 pole of the magnet 6 is disposed in the position at 30 to 110 deg., preferably at 30 to 80 deg. from the position of the N1 pole to the upstream side of the rotation direction of the developing sleeve 2. Thereby, contamination on the surface of the developing sleeve 2 can be efficiently suppressed while developer carrying property of the developing sleeve 2 is maintained, and therefore, an image forming process with high durability and high image quality is possible. |
