| 摘要 |
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. <?in-line-formulae description="In-line Formulae" end="lead"?>1.0<=R/Rc<=1.2<?in-line-formulae description="In-line Formulae" end="tail"?>
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