Developing apparatus featuring multiple magnetic rollers

Details Developing apparatus featuring multiple magnetic rollers Developing apparatus featuring multiple magnetic rollers

2009-11-18

2010-12-14

Gray, David M (Department: 2852)

Electrophotography

Image formation

Development

C399S119000, C399S267000, C399S276000

Reexamination Certificate

active

07853186

ABSTRACT:
A developing apparatus in which a first magnet of a first developing sleeve includes a first magnetic pole near a potion opposing to an image bearing member, and a second magnetic pole being downstream of the first magnetic pole; and a second magnet of a second developing sleeve includes a third magnetic pole near a portion opposing to the first sleeve. Assuming that a magnetic force obtained by combining normal direction forces Fr1and Fr2of magnetic forces generated by the first and second magnets, respectively, near the first sleeve is Fr, a center direction component of the first sleeve of the force Fr becomes positive between the first magnetic pole and a peak value position of the second magnetic pole, and a center direction component of the force Fr becomes negative between the peak value position and the closest position between both sleeves.

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