| 摘要 |
The developing device 100 comprises stirring-transfer means 122, 124, a magnetic roller 130, and a developing roller 140, that are disposed in a housing 110 which contains the two-component developing agent comprising the magnetic carrier and the non-magnetic toner, wherein volumetric mean particle size of the non-magnetic toner is set in a range from 6 to 11 mum, and proportion of toner particles not larger than 4 mum is set to 8% by number or less, thereby making it possible to prevent imaging defect (ghost) and sticking of the toner onto the developing roller from occurring.
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