Electrophotography – Image formation – Development
Reexamination Certificate
2008-05-27
2010-12-07
Gray, David M (Department: 2852)
Electrophotography
Image formation
Development
C399S276000, C399S277000, C399S267000, C430S122100, C430S122200, C430S123580
Reexamination Certificate
active
07848686
ABSTRACT:
A developing device uses a two-component developer including at least carriers and toners. The toners are supplied to an image bearing member bearing an electrostatic latent image so that a toner image is developed from the electrostatic latent image. The developing device has a developing roller arranged to oppose the image bearing member; and a magnetic roller arranged to oppose the developing roller. The magnetic roller retains the two-component developer to supply toners to the developing roller. The developing roller and the magnetic roller are rotationally driven in directions to be opposite from one another at an opposed position, and a magnetic pole of the magnetic roller and a magnetic pole of the developing roller have magnetic polarities different from one another at the opposed position. A surface roughness of the magnetic roller is greater than a surface roughness of the developing roller.
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Fujishima Masashi
Inoue Toyotsune
Mori Yukihiro
Nakaue Takahisa
Sakata Shoichi
Gray David M
Gray Francis
Hespos Gerald E.
Kyocera Mita Corporation
Porco Michael J.
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