Method of controlling charging potential of conductive...

Details Method of controlling charging potential of conductive... Method of controlling charging potential of conductive...

2005-01-11

2005-01-11

Grimley, Arthur T. (Department: 2852)

Electrophotography

Control of electrophotography process

Control of charging

C399S089000, C399S176000

Reexamination Certificate

active

06842591

ABSTRACT:
A method of controlling a charging potential of an organic photoconductive cell (OPC) includes a first operation of applying two charging voltages Vc1and Vc2having respective duties D1and D2established in an engine controller unit (ECU) to a conductive roller via a high voltage power supply (HVPS) to charge the OPC, a second operation of measuring sensing voltages Vs1and Vs2through a sensing resistor Rs coupled to the conductive roller so that the ECU establishes a target charging current it and calculates a new charging voltage Vc3and a new duty D3, a third operation of applying the new charging voltage Vc3and the new duty D3to the conductive roller via the HVPS to charge the OPC and measuring a charging current Ic3of the conductive roller, and a fourth operation of comparing a difference between the charging current Ic3of the conductive roller and the target charging current It with a tolerance value TOL to control the charging potential by using the target charging current when the difference is smaller than the tolerance value TOL. The method maintains the charging potential by compensating for a residual potential of the OPC, thus improving a performance of a printer.

REFERENCES:
patent: 5749022 (1998-05-01), Kikui et al.
patent: 6278103 (2001-08-01), Takami
patent: 6564023 (2003-05-01), Takami et al.
patent: 4-125069 (1992-04-01), None
patent: 2002-287466 (2002-10-01), None

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