| 摘要 |
PROBLEM TO BE SOLVED: To form a uniform thin toner layer by preventing excessive electrification and flocculation of toner in both end parts in the longitudinal direction of a rotating sleeve in a simple constitution in a developing device using magnetic one component developer (magnetic toner). SOLUTION: A developing roll 23 is provided with a fixed magnet roll 23b, on which a plurality of magnetic poles are formed along the circumferential direction, and the rotating sleeve 23a including the fixed magnet roll. The thickness of the magnetic toner formed on the rotating sleeve is restricted and made into the thin toner layer by a magnetic blade 24a extended in the axial direction of the developing roll, facing the rotating sleeve. The magnetized pattern in the axial direction of the fixed magnet roll has a strong magnetic force part in which the magnetic force is stronger in a range specified beforehand than in other parts excluding the both end parts. COPYRIGHT: (C)2005,JPO&NCIPI |
