The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 11, 2005
Filed:
Jan. 30, 2003
Woo-jung Shim, Suwon-si, KR;
Seung-deog an, Yongin-si, KR;
Min-seon Kim, Suwon-si, KR;
Samsung Electronics Co., Ltd., Suwon-Si, KR;
Abstract
A method of controlling a charging potential of an organic photoconductive cell (OPC) includes a first operation of applying two charging voltages Vcand Vchaving respective duties Dand Destablished 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 Vsand Vsthrough 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 Vcand a new duty D, a third operation of applying the new charging voltage Vcand the new duty Dto the conductive roller via the HVPS to charge the OPC and measuring a charging current Icof the conductive roller, and a fourth operation of comparing a difference between the charging current Icof 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.