| 摘要 |
An image forming apparatus is provided for obtaining excellent developing properties using toner with small particle diameters and for forming high-quality visual images. In a developing device of an image forming apparatus, a two-component developer is used which satisfies conditions that volume mean particle diameter dt of a toner is 3~5 mum (Condition 1), volume mean particle diameter dc of a carrier is 5 dt~10 dt (Condition 2), and a weight ratio Rw of the toner and the carrier is 1.6 (dt/dc) x(rhot/rhoc)~2.4 (dt/dc)x(rhot/rhoc) (Condition 3, where rhot and rhoc are density of the toner and the carrier, respectively). A main magnetic pole M of a rotary sleeve is arranged in the vicinity of the closest position of the rotary sleeve and an image forming body, and the closest distance D between the rotary sleeve and the image forming body satisfies a condition that D is 0.5 H~0.8 H for the free tip height H of a magnetic brush B of the main magnetic pole M. It is preferable that the actual supplied amount of the toner is regulated within a specific range.
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