| 摘要 |
PROBLEM TO BE SOLVED: To provide a developer carrier, while ensuring a function of convex parts with concave-convex shape formed on the surface, capable of preventing a reduction in developing performance due to a reduction in field intensity in the concave parts; a developing device; and an image forming apparatus.SOLUTION: A developing roller 42 has first spiral grooves L1 and second spiral grooves L2, the winding directions of which are different from each other with respect to an axial direction orthogonal to a surface movement direction (circumferential direction B), and convex parts 42a surrounded by the first grooves L1 and second grooves L2. A period Sin an axial direction of the first grooves L1, a period Sin an axial direction of the second grooves L2, and a period Sin the axial direction of the convex parts 42 (top face) are different from each other; and a period Yin the surface movement direction of the first groove L1, a period Yin the surface movement direction of the second grooves L2, and a period Yin the surface movement direction of the convex parts 42 (top face) are different from each other. |
