| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a developing device which excels in durability, can form fine images free of edge effects over a prolonged period of time, and further, prevents the occurrence of defective images, such as, adhering of carriers over a prolonged period of time, an image forming apparatus, image forming method and a process cartridge. <P>SOLUTION: The developing device comprises a developer bearing member, including a nonmagnetic developing sleeve which has a magnetic field generation means fixed therein, and rotates while bearing a two-component developer constituted of a magnetic carrier and a toner on a surface thereof; and a developer amount control member, configured to control the amount of the developer born on the developer bearing member. The magnetic carrier has a carrier core material and a coating layer coated on the core material, the coating layer containing a binder resin and conductive particles. The magnetic carrier satisfy the ratio D/h of 1.00<[D/h]<1.95, where D denotes an average primary particle diameter of the conductive fine particles, and h denotes a thickness of the coating layer, and a ratio Ra/D of 1.0<[Ra/D]<10.0, where Ra denotes the surface roughness of the developing sleeve. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
