| 摘要 |
A developing unit for developing an electrostatic latent image born on an image bearing member with a developer that has been charged by mixing and agitating toner and magnetic carrier, includes: a developing hopper for holding the developer; a developer bearing member arranged opposing the image bearing member for bearing the developer having been mixed and agitated in the developing hopper and supplying the developer to the area for development; and at least a pair of agitating and conveying members rotationally driven in the developing hopper for conveying the developer while agitating, and is constructed such that the agitating and conveying members are arranged substantially parallel to the developer bearing member and each rotational shaft of the agitating and conveying members is embedded with a magnetic source element whose magnetic poles are laid out so as to produce a magnetic field radially oriented in a particular fixed direction with respect to the agitating and conveying member; and a toner supply port for supplying the toner into the developing hopper is arranged over the opposite position of the paired agitating and conveying members.
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