Patent ID: 9134649
Filing Date: 2015-09-15
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image bearing member capable of bearing a developer image that is formed by supplying a developer to a latent image formed on a surface thereof; a developer carrying member that is provided to be capable of rotating while carrying the developer, and that supplies the developer to the image bearing member by contacting the image bearing member; a regulating member that regulates a layer thickness of the developer carried on the developer carrying member; and a voltage applying device for applying a voltage to the developer carrying member and the regulating member, wherein the developer carrying member includes a conductive base layer and a surface layer covering the base layer, and when a volume resistance of the surface layer is ρc, a film thickness thereof is dc, and a relative dielectric constant thereof is ∈c, a surface charge density of the developer on the developer carrying member, the film thickness of which has been regulated by the regulating member, is q/s, a relative dielectric constant thereof is ∈t, and a layer thickness thereof is dt, a potential difference between the developer carrying member and the regulating member is V, and a time required for the developer to pass through a contact region between the developer carrying member and the regulating member after entering the contact region as the developer carrying member rotates is T, is satisfied.