| 摘要 |
PROBLEM TO BE SOLVED: To perform an excellent development operation for a long period of time by improving durability even when recesses and projections are formed on a developing roller by rolling processing. SOLUTION: A development roller 25 includes: a base unit 25a having base recesses (first and second inclined base grooves 29a', 29b') and a base projection 30' that are formed in a predetermined area of a circumference surface, and a surface layer 25b formed on the circumference surface of the base unit 25a and having recesses (first and second inclined grooves 29a, 29b) and a projection 30 formed respectively in accordance with the base recess and the base projection of the base unit 25a. A thickness t of the surface layer 25b is larger than a maximum height h of a base swollen portion 30b' close to the side edge of the base projection 30' from a regular surface (base flat surface 30a') of the base projection 30'. COPYRIGHT: (C)2009,JPO&INPIT |
