| 摘要 |
PURPOSE:To reduce a load applied to a developer and to prevent the deterioration of a magnetic grain by specifying the size of a flux formed between a plural magnetic field generation means. CONSTITUTION:The titled device is composed of a developer container 21, a developing sleeve 22 being a developer holding member, a magnet 23 being a magnetic field generation means, a regulating blade 24 controlling the amount of a developer conveyed to a developing part, etc. The magnet 23 has a magnetic pole S1 controlling the applying amount of a developer to the sleeve 22 in cooperation with a developing magnetic pole N1 and the blade 24, a magnetic pole S3 lifting and conveying a developer in cooperation with magnetic poles N1 and N2 and a magnetic pole S2 dropping the developer on a screw 44 in cooperation with the magnetic pole S2. It is assumed that a flux formed between the magnetic poles S1 and N2 is less than half a flux formed between the magnetic poles N2 and S3. Thus the load applied to the developer can be remarkably reduced due to the regulating action of the blade 24, thereby prolonging the life of the developer.
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