Fitzpatrick, Cella, Harper & Scinto
Developing apparatus
 A developing apparatus for developing an electrostatic latent image formed on a movable image bearing member includes a rotatable developer carrying member for carrying a developer into a developing zone where an image bearing member and the developer carrying member are faced and where the electrostatic latent image on the image bearing member is developed, a magnet stationarily disposed in the developer carrying member, wherein the magnet forms in the developing zone such a magnetic field that a peak position of a magnetic flux density of the magnetic field in a direction perpendicular to a surface of the developer carrying member is in the developing zone, and wherein a magnetic confining force in the perpendicular direction in the developing zone is so distributed that it is stronger downstream of a position where the image bearing member and the developer carrying member are closest with respect to a movement direction of the image bearing member than at the closest position. 
Canon Kabushiki Kaisha
G B
G03G B82Y
inventional inventional
Matsuomi
Nishimura