Patent ID: 9213259
Filing Date: 2015-12-15
Classification: G03G

Abstract:
1. A developing device, comprising: a developer bearing member which bears a two-component developer including a toner and carrier; a magnet member disposed inside the developer bearing member, the magnet member making the developer bearing member bear the two-component developer on the developer bearing member by magnetic force; and a developer regulating member which regulates a layer thickness of the developer borne on the developer bearing member, the developer regulating member being made of magnetic material, the developer regulating member being fixed at both end portions in a longitudinal direction, wherein grooves are formed on a surface of the developer bearing member, and a developer conveying force of the grooves at a central portion of the developer bearing member in the longitudinal direction is larger than a developer conveying force of the grooves at an end portion of the developer bearing member in the longitudinal direction.