| abstract |
Even when a separation area where a rotation axis of a conveying screw and a magnet pair of the same polarity are arranged is above the rotation axis of a developing sleeve, density irregularities corresponding to ghosts and conveying screw eyes are generated. Providing no developing device. The rotation radius r of the conveying screw, the rotation radius R of the developing sleeve, and the distance d between the respective rotation axes are r + R ≦ d ≦ 3r + R. The shape factor SF of the carrier is 110 or less and the surface is coated with a fluorine-modified silicone resin or a fluorine-modified acrylic resin. [Selection] Figure 2 |