Electrophotography – Image formation – Development
Reexamination Certificate
2009-03-05
2010-10-12
Ngo, Hoang (Department: 2852)
Electrophotography
Image formation
Development
C399S267000, C399S276000
Reexamination Certificate
active
07813680
ABSTRACT:
To downsize a developing device in the developing carrier axial direction without generating image concentration irregularities from recirculation of developer in the magnetic roller end regions, an N2pole and an N3pole, which are mutually adjacent having the same polarity (N polarity), and which are for generating a magnetic force for removing from a developing sleeve a developer that has passed through a developing region, are provided on a magnetic roller. Magnets of this developing device, which are for generating a magnetic field to displace to the inside in the axial direction magnetic force lines that cause peeling force in the direction of separation from the developing sleeve to act on developer on the developing sleeve, based on the magnetic force of the N2pole and the N3pole, and that pass through the axial direction end regions within a developer separation region on the developing sleeve, are provided on the outside of the magnetic roller.
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Hattori Yoshio
Masuda Katsumi
Ozeki Takamasa
Suzuki Yuji
Uenishi Hiroyuki
Ngo Hoang
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Ricoh & Company, Ltd.
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