Electrophotography – Image formation – Charging
Reexamination Certificate
2007-04-24
2007-04-24
Gray, David M. (Department: 2852)
Electrophotography
Image formation
Charging
C399S174000, C399S176000
Reexamination Certificate
active
11434121
ABSTRACT:
Charging roller has at least a support member and a conductive covering member, the charging roller where a value of tan δ expressed in a ratio of a storage elastic modulus and a loss elastic modulus by dynamic viscoelasticity in a cross sectional direction of the charging roller at 25° C. is 0.2 or more in a range of 1 to 20 kHz and 0.2 or less in a range of 1 to 10 Hz, or a charging roller where the conductive covering member is constructed of two or more layers and a value of tan δ in at least one layer other than a surface layer is 0.2 or more at 10 Hz in a range of 10 to 50° C. and a value of tan δ in a cross sectional direction of the whole charging roller is 0.2 or less at 10 Hz in a range of 10 to 50° C.
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Abe Hiroshi
Kawakami Tomoya
Okuda Ayumi
Takahashi Hirobumi
Canon Kasei Kabushiki Kaisha
Evans Geoffrey T
Fitzpatrick ,Cella, Harper & Scinto
Gray David M.
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