Developing device and image forming apparatus having the same

Details Developing device and image forming apparatus having the same Developing device and image forming apparatus having the same

2008-05-30

2010-02-16

Gray, David M (Department: 2852)

Electrophotography

Image formation

Development

C399S267000, C399S274000, C399S276000, C399S282000

Reexamination Certificate

active

07664440

ABSTRACT:
A developing device and an image forming apparatus capable of restraining density irregularity and restraining a decline in image quality caused by adherence of carrier to a photoreceptor, are provided. An angle α is in a range of no less than 45 degrees nor more than 57 degrees, which is formed between a plane comprising a central line of magnetic pole formed by a regulating pole in a magnet roller and a rotating central axis of a developing sleeve and a plane comprising a central line of magnetic pole formed by a pumping pole and a rotating central axis of the developing sleeve. Further, an absolute value of the maximum value of strength of the magnetic pole formed by a main pole is in a range of no less than 120 mT nor more than 140 mT.

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