Image forming apparatus

Details Image forming apparatus Image forming apparatus

2011-08-02

2011-08-02

Porta, David P (Department: 2884)

Electrophotography

Control of electrophotography process

Control of developing

C399S027000, C399S028000, C399S237000

Reexamination Certificate

active

07991313

ABSTRACT:
An image forming apparatus includes an alternating-current high-voltage power supply generating an alternating-current bias for detection of the remaining amount of toner. The alternating-current high-voltage power supply includes a piezoelectric transformer, a piezoelectric-transformer driving unit, a piezoelectric-transformer driving-signal generating unit, a voltage detecting unit, a voltage setting unit, and an controlling unit that feeds back a difference signal between a detection level signal supplied from a detection signal detecting unit and a setting signal supplied from the voltage setting unit to the piezoelectric-transformer driving-signal generating unit to control an output voltage from the piezoelectric-transformer.

REFERENCES:
patent: 2007/0025753 (2007-02-01), Saito et al.
patent: 2008/0260402 (2008-10-01), Yasukawa
patent: 2009/0052918 (2009-02-01), Toda et al.
patent: 2009/0154942 (2009-06-01), Hotogi et al.
patent: 8-44184 (1996-02-01), None

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