Charge voltage control circuit and image forming apparatus...

Details Charge voltage control circuit and image forming apparatus... Charge voltage control circuit and image forming apparatus...

2006-11-21

2006-11-21

Grainger, Quana (Department: 2852)

Electrophotography

Machine operation

Having power supply

Reexamination Certificate

active

07139501

ABSTRACT:
An image forming apparatus includes a control voltage generation circuit which inputs a primary AC voltage to the primary side of a voltage transformer, generates a control voltage corresponding to a current generated on the secondary side of the voltage transformer in accordance with the primary AC voltage, and controls the primary AC voltage on the basis of the control voltage and a control signal, a current detection circuit which is connected, through a capacitor, to a path which supplies the current generated on the secondary side of the voltage transformer to a charge roller and detects a charge current to charge an image carrier, and a control circuit which determines the control signal on the basis of the relationship between a predetermined control signal (PRICNT) and a current value (Icap) detected by the current detection circuit in accordance with the predetermined control signal and controls the primary AC voltage to be generated by the voltage generation circuit.

REFERENCES:
patent: 4851960 (1989-07-01), Nakamura et al.
patent: 6278103 (2001-08-01), Takami
patent: 6539184 (2003-03-01), Shimura et al.
patent: 6564023 (2003-05-01), Takami et al.
patent: 2004/0005159 (2004-01-01), Ito et al.
patent: 63-149668 (1988-06-01), None

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