| 摘要 |
An image forming unit includes: an image supporting member for forming a latent image on a surface thereof; a developer supporting member for supplying developer to the image supporting member to develop the latent image; and a developer layer regulating member abutting against the developer supporting member for forming a thin developer layer. The developer layer regulating member and the developer supporting member are configured to satisfy the following relationships: <?in-line-formulae description="In-line Formulae" end="lead"?>mub<=muR<=2xmub <?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>Rz<=D<?in-line-formulae description="In-line Formulae" end="tail"?> where mub is a dynamic friction coefficient between the developer layer regulating member and the developer; mur is a dynamic friction coefficient between the developer supporting member and the developer; Rz is an average surface roughness of the developer supporting member; and D is a volume average particle diameter of the developer.
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