| 摘要 |
PROBLEM TO BE SOLVED: To provide a developing roller capable of reliably suppressing occurrence of defects on an output image, such as pitch unevenness and density unevenness and toner sticking on a sleeve surface, and capable of stably scooping up a developer over time, and to provide a developing device, a process cartridge and an image forming apparatus. SOLUTION: The sleeve 23a2 of the developing roller 23a is formed so that its peripheral surface becomes an irregularly uneven surface. The peripheral surface of the sleeve 23a2 is provided with a surface roughness Rz in roughness profile within a range of 5-20μm and the number of depressed portions of≥1μm depth is set to a range of 1-5 per 0.2 mm measured length. COPYRIGHT: (C)2006,JPO&NCIPI
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