Electrophotography – Image formation – Development
Reexamination Certificate
2011-07-12
2011-07-12
Gray, David M (Department: 2852)
Electrophotography
Image formation
Development
C430S105000
Reexamination Certificate
active
07979010
ABSTRACT:
Provided is an image forming apparatus including at least a latent image bearing member, a latent electrostatic image forming unit, a developing unit which includes at least a developing roller and a supply roller, and a transfer unit, wherein both of a diameter R (mm) of the developing roller and a diameter R′ (mm) of the supply roller are 12 mm or less; the toner contains at least a binder resin, a wax, and a colorant with the wax having a melting point of 75° C. or less; an amount of the wax exposed on a surface of the toner is 10 mg/g to 30 mg/g; and when a diameter (mm) of the developing roller is represented by R the toner has a torque T (mNm) satisfying the inequation, 20/R<T<27/R, at a void rate of 58% as measured by a torque measurement method using a conical rotor.
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Fuwa Kazuoki
Kato Hiroaki
Mikuriya Yoshihiro
Sekiguchi Yoshitaka
Yasunaga Hideaki
Gray David M
Lactaoen Billy J
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Ricoh & Company, Ltd.
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