Electrophotography – Image formation – Development
Reexamination Certificate
2008-03-14
2011-10-18
Gray, David (Department: 2852)
Electrophotography
Image formation
Development
C399S286000
Reexamination Certificate
active
08041270
ABSTRACT:
An image developer using a one-component developer, Including a developing roller visualizing an electrostatic latent image formed on an image bearer with a pulverized toner; and a feed roller feeding the pulverized toner to the developing roller while contacting thereto, wherein the pulverized toner includes a parent toner; a wax; and an external additive comprising an additive having a number-average particle diameter of from 20 to 60 nm and adhering to the surface of the parent toner at an adherence strength of from 50 to 70%, and wherein the following relationships (1) to (3) are satisfied:in-line-formulae description="In-line Formulae" end="lead"?4.70<Log10R<5.70 (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?8.00<Log10Z<10.70 (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−6.25*Log10R+37.5<Log10Z<−6.25*Log10R+45.6 (3)in-line-formulae description="In-line Formulae" end="tail"?wherein R represents a resistivity of the developing roller and Z represents an impedance of the pulverized toner.
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Fuwa Kazuoki
Hagi Masayuki
Inoue Masahide
Katoh Hiroaki
Mikuriya Yoshihiro
Do Andrew
Gray David
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Ricoh Company Limited
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