Electrophotography – Image formation – Transfer
Reexamination Certificate
2006-12-08
2010-10-05
Gray, David M (Department: 2852)
Electrophotography
Image formation
Transfer
Reexamination Certificate
active
07809314
ABSTRACT:
An image forming apparatus includes an image bearing member, supporting rollers, a belt-like-shaped medium, a primary transfer member, secondary transfer rollers, and a grounded conductive roller. The image bearing member forms a toner image at a predetermined process speed. The belt-shaped medium has a charge voltage. The primary transfer member sequentially transfers the toner image onto the belt-like-shaped medium and the secondary transfer member transfers the toner image onto a recording sheet. The conductive roller is arranged in contact with the belt-shaped medium for a predetermined wrapping length. A relationship Tb<X/Vb is satisfied, where Tb is a decay time period that the charge voltage of the belt-shaped medium decays from approximately 200 volts to 200/e volts, where e is a base of natural logarithm, X is the predetermined wrapping length of the belt-shaped medium against the conductive roller, and Vb is the predetermined process speed.
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Gray David M
Hyder G. M.
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Ricoh & Company, Ltd.
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