Patent ID: 8396401
Filing Date: 2013-03-12
Classification: G03G

Abstract:
1. A developing device comprising: a developer container containing a developer; and a developing roller being provided so that a peripheral surface thereof is partially exposed to an outside of the developer container through an opening provided in the developer container, the developing roller being rotated while the developer contained in the developer container is adhered to the developing roller, so that the developer is carried to the outside of the developer container, the developing roller being rotated in such a manner that the peripheral surface thereof passes close by an end of the opening on a bottom-surface side of the developer container to the outside of the developer container, and passes close by an end of the opening on a ceiling side of the developer container to the inside of the developer container, the developing device further comprising: a doctor blade, provided at the end of the opening on the bottom-surface side of the developer container so as to project from the developer container toward the developing roller, regulating a height of a layer of the developer adhered to the developing roller to be carried, the height being a distance from the peripheral surface of the developing roller; and an anti-accumulation section provided at a location where an inner surface of the developer container meets a surface of the doctor blade on an upstream side of a rotation direction of the developing roller, wherein: a plurality of fixed magnetic poles are provided inside the developing roller, the plurality of fixed magnetic poles being disposed apart from each other along the rotation direction of the developing roller and not rotating even when the developing roller is rotated, and the anti-accumulation section is provided to face a section of the developing roller, the plurality of fixed magnetic poles being not provided inside the section of the developing roller facing the anti-accumulation section.