Electrophotography – Machine operation – Having power supply
Reexamination Certificate
2008-04-08
2008-04-08
Tran, Hoan (Department: 2852)
Electrophotography
Machine operation
Having power supply
C399S038000, C399S048000, C399S050000, C399S053000, C399S066000, C399S067000
Reexamination Certificate
active
11282763
ABSTRACT:
Provided are a high voltage generator of an image forming apparatus, which simplifies a circuit structure and reduces the number of control signals by commonly using a roller resistance sensing circuit unit, and a method of sensing roller resistance. The high voltage generator applies high voltages to a plurality of rollers included in the image forming apparatus and senses resistance values of the rollers. The high voltage generator includes a plurality of voltage-pumping circuit units for providing high voltages to the respective rollers. A plurality of high voltage divide circuit units divide the high voltages output from the voltage-pumping circuit units. A multiplexer receives a plurality of divide signals output from the high voltage divide circuit units, selects and outputs a divide signal, which corresponds to a resistance of a roller to be sensed, based on a predetermined select signal. A roller resistance sensing circuit unit resets the selected divide signal output from the multiplexer to meet an input voltage range of an analog-digital converter, output the reset signal, and is commonly used to sense the resistance values of the rollers.
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Roylance Abrams Berdo & Goodman L.L.P.
Tran Hoan
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