Patent ID: 6160976
Filing Date: 2000-12-12
Classification: G03G

Abstract:
A developing device comprising:a developer container containing magnetic particles;a developer holding member provided at an opening portion of said developer container, said developer holding member rotating while holding a developer;a magnetic field generating member placed in said developer holding member;a magnet provided along a circumferential direction of said developer holding member so as to be opposed to the vicinity of an edge portion of said developer holding member; andwherein said magnet and said magnetic field generating member are provided so as to overlap each other in a longitudinal direction of said developer holding member, and a first magnetic brush is formed by a magnetic field generated between said magnet and said magnetic field generating member,a magnetic member magnetized by said magnet and provided so as to be adjacent to an outside of said magnet and to be opposed to said developer holding member in the longitudinal direction,wherein a second magnetic brush is formed by a magnetic field generated between said magnet and said magnetic member.