Electrophotography – Machine operation – Having power supply
Reexamination Certificate
2007-03-13
2007-03-13
Tran, Hoan (Department: 2852)
Electrophotography
Machine operation
Having power supply
C399S050000, C399S067000, C399S089000
Reexamination Certificate
active
10950427
ABSTRACT:
An output of a DC high voltage source is supplied as a bias to a heat fixing apparatus. An output of the DC high voltage source is divided by resistors, and a divided output is supplied as a DC bias to a charging apparatus. A feedback circuit generates a feedback signal corresponding to a difference between the divided output and a reference voltage, for supply to the DC high voltage source thereby controlling the divided output voltage at a desired value. Such structure allows a supply of a bias voltage to the heat fixing apparatus higher than the bias voltage to the charging apparatus, thereby eliminating defects in the fixing apparatus such as a fixation tailing or an offset phenomenon. Also the charging apparatus can be given an exactly controlled bias voltage, thereby avoiding a halftone density unevenness resulting from an uneven charging.
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Sato Akiya
Suzumi Masahiko
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