Electrophotography – Machine operation – Having power supply
Reexamination Certificate
2006-01-20
2009-06-16
Beatty, Robert (Department: 2852)
Electrophotography
Machine operation
Having power supply
C310S318000, C323S355000
Reexamination Certificate
active
07548708
ABSTRACT:
A power supply unit in an image forming apparatus is provided. The power supply unit includes a piezoelectric transformer, an output voltage detecting circuit which detects the output voltage of the piezoelectric transformer, an output voltage control circuit which controls an output voltage from the piezoelectric transformer, and includes a comparator which receives an output voltage setting signal, together with an output voltage detecting signal fed back from the output voltage detecting circuit, to compare the output voltage setting signal and the output voltage detecting signal. The power supply unit also includes a driving frequency supplying circuit which generates a driving frequency signal of the piezoelectric transformer in accordance with a comparison result by the comparator, and supplies the driving frequency signal to the piezoelectric transformer. The time constant of the output voltage control circuit is longer than the time constant of the output voltage detecting circuit.
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Murata Hiroki
Nagasaki Osamu
Nakamori Tomohiro
Namiki Teruhiko
Uchiyama Takehiro
Beatty Robert
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
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