| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a development device that prevents a density decrease and an image defect such as a soiled base and steadily develops a satisfactory image by preventing caking on a development sleeve in such a manner that the surface characteristics of the development sleeve (10-point average roughness indicated by Rz and an average interspace between local peaks indicated by S) are regulated with respect to the toner particle diameter of developer to be used, and to provide an image forming apparatus using the development device. <P>SOLUTION: The development device 4 includes: a rotary developer carrier 16; and a developer restricting member 21 that restricts the thickness of the layer of the two-component developer 18 composed of magnetic carrier and toner, the layer being formed on the surface of the developer carrier 16. In the development device 4, the surface 16a of the developer carrier 16, when the average particle diameter of the toner is Dμm, satisfies the conditions expressed by the formula 1, D/4≤Rz≤D and 4D≤S≤10D (wherein Rz is 10-point average roughness and S is an average spacing between local peaks). <P>COPYRIGHT: (C)2004,JPO&NCIPI |
