Patent ID: 7561838

Claim:
A developing apparatus, which develops an electrostatic image on an image bearing member by using a developer containing magnetic particles, said developing apparatus comprising: a developer container, which contains the developer; a first developer carrying member that is rotatably disposed in said developer container, and carries and transports the developer toward a first development area; a second developer carrying member that is rotatably disposed in a vicinity of said first developer carrying member in said developer container, and carries and transports the developer delivered from said first developer carrying member in a developer delivery region toward a second development area; a first magnetic field generating member, which is disposed in said first developer carrying member and has a plurality of magnetic poles, said first magnetic field generating member having a first magnetic pole at a position facing the developer delivery region; a second magnetic field generating member, which is disposed in said second developer carrying member and has a plurality of magnetic poles, said second magnetic field generating member having a second magnetic pole that is different in polarity from said first magnetic pole at a position facing the developer delivery region; a first magnet member disposed in a vicinity of an axial end of said first developer carrying member along a peripheral surface of said first developer carrying member without facing said first magnetic pole; and a second magnet member disposed in a vicinity of an axial end of said second developer carrying member along a peripheral surface of said second developer carrying member without facing said second magnetic pole, a surface facing said second developer carrying member in a downstream end area of said second magnet member in a rotating direction of said second developer carrying member being identical in polarity with said second magnetic pole.