| 摘要 |
PROBLEM TO BE SOLVED: To provide a developing device which achieves one of reduction of stress to toner, improvement of a toner scraping-off function, and continuous supply of an external additive. SOLUTION: The developing device 14 includes a developing container 1 which contains nonmagnetic toner as a one-component developer, a developing roller 2, and a toner supply roller 3. Further, the developing roller 2 and toner supply roller 3 are connected to power sources respectively, and a bias to move toner from the toner supply roller 3 to the developing roller 2 is applied between the developing roller 2 and toner supply roller 3. Further, a value of reaction force (N)/compression distance (mm), i.e. a gradient is set to≤0.699 [N/mm] when a disk of 50 mm in diameter is fitted to the tip of a push-pull gauge and a center part of the roller is pressed in while both ends of the toner supply roller 3 are supported. COPYRIGHT: (C)2008,JPO&INPIT |
