| 摘要 |
A developing device includes a developing container for containing therein a developer provided with a carrier and a toner, a conveying device for conveying the developer in the developing container, a developer bearing member for bearing thereon the developer conveyed by the conveying device, the developer bearing member conveying the developer to a developing portion for developing a latent image formed on an image bearing member, a magnetic field generating device provided in the developer bearing member for generating a magnetic field, the magnetic field generating device being provided with a first magnetic pole and a second magnetic pole provided so as to be adjacent to the downstream side of the first magnetic pole in the direction of rotation of the developer bearing member and having the same polarity as the first magnetic pole, and a regulating device for regulating the layer thickness of the developer on the developer bearing member at a location substantially opposed to the second magnetic pole. The component Br of the intensity of the magnetic field formed between the first magnetic pole and the second magnetic pole in a direction perpendicular to the surface of the developer bearing member assumes a minimum value at a location nearer to the second magnetic pole than to the first magnetic pole, and the minimum value is of the same polarity as the first magnetic pole.
|
