Developing device for an image forming apparatus and process cartridge including the same

In a process cartridge comprising a developing device for developing a latent image formed on an image carrier, said developing device comprising:

• a rotatable, nonmagnetic developer carrier;
• and
• magnetic field generating means for generating a magnetic field in a developing zone where said developer carrier faces the image carrier, said magnetic field causing a developer deposited on said developer carrier to rise in the form of a magnet brush;
• wherein a magnetic pole for development is located upstream of a closest position where said developer carrier and the image carrier are closest to each other in a direction of rotation, and
• a magnetic force, as measured on a surface of said developer carrier, increases from a position of the magnetic pole toward a position where the magnet brush finally leaves the image carrier.

An image forming apparatus comprising a developing device for developing a latent image formed on an image carrier, said developing device comprising:

• a rotatable, nonmagnetic developer carrier;
• and
• magnetic field generating means for generating a magnetic field in a developing zone where said developer carrier faces the image carrier, said magnetic field causing a developer deposited on said developer carrier to rise in the form of a magnet brush;
• wherein a magnetic pole for development is located upstream of a closest position where said developer carrier and the image carrier are closest to each other in a direction of rotation, and
• a magnetic force, as measured on a surface of said developer carrier, increases from a position of the magnetic pole toward a position where the magnet brush finally leaves the image carrier.