Image forming apparatus including a developer bearing member...

Details Image forming apparatus including a developer bearing member... Image forming apparatus including a developer bearing member...

2010-06-17

2011-11-15

Walsh, Ryan (Department: 2852)

Electrophotography

Image formation

Development

C399S053000, C399S267000, C399S272000, C399S279000, C399S281000, C399S282000

Reexamination Certificate

active

08059995

ABSTRACT:
An image forming apparatus including: an image bearing member; and a developer bearing member bearing a developer including a toner and a carrier, the developer bearing member developing an electrostatic image formed on the image bearing member with the developer, and the developer bearing member being applied with an alternate voltage in order to form an alternate electric field between the developer bearing member and the image bearing member, wherein assuming that electric field intensities Eb and Ed be Eb=|(Vp1−VL)/D| and Ed=|(Vp2−VL)/D|, a relationship, 0≧K1>K2, is satisfied, where K1: a gradient at Ed, and K2: a gradient at Eb, and wherein a resistivity ρb of the carrier at the electric field intensity Eb satisfies 1.1×106×en<ρb<6.0×107[Ω·m] (where: e is the base of natural logarithms; and n=4×Eb×10−7).

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