Patent ID: 6421520
Filing Date: 2002-07-16
Classification: G03G

Abstract:
A developing apparatus, comprising:a developing container containing developer including magnetic carrier and non-magnetic toner; a developer bearing body provided at an opening of said developer container, for rotating while bearing the developer; a magnet member provided within said developer bearing body, having a first magnetic pole and a second magnetic pole, wherein the second magnetic pole is adjacent on the downstream side of said developer bearing body of the first magnetic pole in a direction of rotation thereof and has the same polarity as the first magnetic pole; and a regulating member provided in the vicinity of the second magnetic pole, for regulating an amount of developer on said developer bearing body, wherein between the first magnetic pole and the second magnetic pole, there exists 40Â° or more a lower limit area having 3 to 8 mT in magnetic flux density in the direction of a normal to a surface of said developer bearing body.