Patent ID: 7792472

Claim:
A developing apparatus comprising: a developing unit including a developer carrier that performs a surface motion while carrying a two-component developer on a surface thereof, the developer containing a magnetic carrier and a toner, and performs development in a development area opposing a latent image carrier by supplying the toner to a latent image on a surface of the latent image carrier; a developer supply unit that first supplies the developer to the surface of the developer carrier at a supply position, the developer supply unit including a partition wall having an end portion corresponding to the supply position, the supply position being disposed adjacent to the surface of the developer carrier; and a developer amount restricting member opposing the surface of the developer carrier, the developer amount restricting member restricting a layer thickness of the developer that is supplied to the surface of the developer carrier by the developer supply unit and conveyed to the development area, wherein a restricting member upstream side central angle at a rotary center of the developer carrier is defined between a first position on the surface of the developer carrier opposing the developer amount restricting member and a second position on the surface of the developer carrier corresponding to the supply position, the second position being on an upstream side of the first position in a surface motion direction of the developer carrier, the restricting member upstream side central angle ranging between not less than 0° and not more than 60°, and an area of the surface of the developer carrier corresponding to the area bounded by the restricting member upstream side central angle is a low magnetic flux density area in which a normal direction magnetic flux density on the surface of the developer carrier ranges between not less than 0 mT and not more than 30 mT.