Electricity: electrical systems and devices – Electric charge generating or conducting means – Use of forces of electric charge or field
Patent
1989-06-23
1992-07-21
Pellinen, A. D.
Electricity: electrical systems and devices
Electric charge generating or conducting means
Use of forces of electric charge or field
355222, 355296, G03G 1300
Patent
active
051328690
ABSTRACT:
Improved circuitry applicable to an electrophotographic copier or similar image forming apparatus for controlling high voltages which are applied to various components of the apparatus such as corona dischargers. While the charge current of a photoconductive element is detected periodically, the output current of a high-tension power source which feeds a high voltage to a corona discharger is set on the basis of the detected charge current. When the charge current is set at a predetermined value, the output current of the high-tension power source is subjected to constant voltage control. Cleaning is performed only when the voltage is not at a reference value. A current feedback arrangement from the photoconductor uses two oppositely polarized half-wave rectifiers and a voltage doubler.
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Osborn David
Pellinen A. D.
Ricoh & Company, Ltd.
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