Electrophotography – Control of electrophotography process – Having temperature or humidity detection
Reexamination Certificate
2005-07-12
2005-07-12
Ngo, Hoang (Department: 2852)
Electrophotography
Control of electrophotography process
Having temperature or humidity detection
C399S050000, C399S176000
Reexamination Certificate
active
06917770
ABSTRACT:
A charging voltage controller of an image forming apparatus includes a charging roller charging a photoconductive drum with a predetermined charging voltage, a high voltage supply unit supplying the predetermined charging voltage to the charging roller, an electric current detecting unit detecting an electrical current flowing the charging roller, and a control unit supplying first and second test voltages of different degrees to the charging roller, determining a first reference voltage to be applied to the charging roller based on data from the electric]current detecting unit outputted in response to the first test voltage, calculating slope data based on the electrical current data detected from the electric current detecting unit in response to the first and second test voltages, and determining the charging voltage to be applied to the charging roller as a sum of the first reference voltage and a preset offset voltage that corresponds to the slope data.
REFERENCES:
patent: 5132869 (1992-07-01), Nakaya
patent: 6615002 (2003-09-01), Saito et al.
patent: 6640063 (2003-10-01), Adachi et al.
Bae Byoung-chul
Jeong Su-jong
Lee Ui-choon
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