Developing apparatus and image forming apparatus using same

A developing apparatus comprising:

• a developing unit having a developer carrier which rotates while carrying a two-component developer constituted by a magnetic carrier and a toner on a surface thereof, and performs development in a location opposing a latent image carrier by supplying the toner to a latent image on a surface of the latent image carrier, and a developer supply unit for supplying the two-component developer to the developer carrier;
• a stirring unit having stirring means for stirring the two-component developer, which is capable of sending and receiving the two-component developer to and from the developing unit;
• and
• toner replenishing means for supplying replenishment toner to the two-component developer in the stirring unit,
• wherein the two-component developer in the stirring unit is stirred by the stirring means when transfer of the two-component developer from the stirring unit to the developing unit is halted.

A developing apparatus comprising:

• a developing unit having a developer carrier, which performs a surface motion while carrying a two-component developer constituted by a magnetic carrier and a toner on the surface thereof 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 for supplying the developer to the surface of the developer carrier, and a developer amount restricting member opposing the surface of the developer carrier, which restricts 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, when a central angle at a rotary center of the developer carrier between a restricting member opposing position opposing the developer amount restricting member on the surface of the developer carrier and an arbitrary position on an upstream side of the restricting member opposing position in a surface motion direction of the developer carrier is set as a restricting member upstream side central angle, a range in which an angle of the restricting member upstream side central angle is not less than 0[°] and not more than 60[°] is set as a low magnetic flux density area in which a normal direction magnetic flux density on the surface of the developer carrier is within a range of not less than 0 [mT] and not more than 30 [mT].