| 摘要 |
PROBLEM TO BE SOLVED: To provide a development apparatus where, when development is performed using a two component developer composed of each toner comprising a coloring agent whose content is≥10 wt.% and each carrier, the sticking of the toner to the surface of the circumferential face in a development sleeve is prevented, so as to improve a picture. SOLUTION: The development apparatus is provided with: a development tank 11 storing a two component developer composed of each carrier having a core material and a covering layer for covering the core material, and each toner containing a releasing agent, a coloring agent or the like; and a development sleeve 4 carrying the two component developer on the circumferential face and feeding the toner to the surface of a photoreceptor 100 at a development region Y. In the toner comprised in the two component developer, the content of the coloring agent is≥10 wt.%, and, in the toner stored in the development tank 11, the content of the toner with a particle diameter of 0.6 to 2.0μm is≤10 piece %. COPYRIGHT: (C)2008,JPO&INPIT
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