Electrophotography – Control of electrophotography process – Control of transfer
Reexamination Certificate
2005-11-08
2005-11-08
Grimley, Arthur T. (Department: 2852)
Electrophotography
Control of electrophotography process
Control of transfer
C399S088000, C399S314000
Reexamination Certificate
active
06963701
ABSTRACT:
An image forming device includes a powere source with a forward transfer bias circuit for applying a forward transfer bias to the transfer roller based on a detected resistance Z, during image transfer, and a reverse transfer bias circuit for applying a reverse bias during a cleaning operation, both through constant current control, both circuits connected in series, During constant current control, the forward bias circuit detects the resistance value Z on the transfer roller using the equation Z=(αVe−Ri1)/i1, where α is the ratio of voltages in the secondary winding and auxiliary winding in the transformer of a forward transfer booster/rectifying and smoothing circuit, Ve is the output voltage from a forward transfer output voltage detecting circuit, R is the resistance in a discharge resistor of a reverse transfer booster/rectifying and smoothing circuit, and i1is the constant current setting.
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Brother Kogyo Kabushiki Kaisha
Gleitz Ryan
Grimley Arthur T.
Oliff & Berridg,e PLC
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