Developing device with developing blade having curved portion and image forming device
View Patent ↗A developing device includes a developer support member and a developing blade having a curved portion abutting against the developer support member. When Rc represents a minimum curvature radius of the curved portion of the developing blade and R represents a curvature radius at an abutting point where the curved portion abuts against the developer support member, a ratio of R to Rc (R/Rc) meets the following relation. 1.0≦ R/Rc ≦1.2
1. A developing device comprising:
a developer support member; and
a developing blade having a curved portion abutting against the developer support member, wherein a ratio of a minimum curvature radius Rc of the curved portion of the developing blade and a curvature radius R of the curved portion at an abutting point where the curved portion abuts against the developer support member establishes a relation of 1.09≦R/Rc≦1.2.
2. The developing device according to claim 1 , wherein said developing blade abuts against the developer support member at the abutting point situated at a downstream side of the curved portion having the curvature radius Rc.
3. The developing device according to claim 1 , wherein said developing blade includes a bent plate member.
4. The developing device according to claim 3 , wherein said bent plate member has a thickness of 0.05 to 0.50 mm.
5. The developing device according to claim 1 , wherein said developing blade includes the curved portion having the curvature radius Rc between 0.1 and 1.0 mm, said developing blade abutting against the developer support member at the abutting point having the curvature radius R between 0.1 and 1.0 mm.
6. The developing device according to claim 1 , wherein said developing blade includes a portion having a surface roughness less than 1 μm, wherein the surface roughness is obtained from a sum of a first average of absolute heights of highest to fifth highest portions from an average line obtained from a roughness profile of the developing blade plate along an average line in a standard length and a second average of absolute heights of deepest to fifth deepest portions from the average line in the standard length.
7. The developing device according to claim 1 , wherein said developing blade includes the curved portion having a bending angle within a range of 40° to 100°.
8. An image forming device comprising the developing device according to claim 7 .
9. An image forming device comprising the developing device according to claim 1 .