Image forming apparatus

Electrophotography – Control of electrophotography process – Control of transfer

Reexamination Certificate

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Reexamination Certificate

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08000621

ABSTRACT:
An image forming apparatus is configured to reduce follow-up delay in impedance fluctuation and to reduce an accuracy fall in power supply control. The image forming apparatus includes a transfer element, a supply element, a detection element, a modification element, and a switch element. The supply element supplies electricity that depends on a set value to the transfer element. The detection element detects the control object value supplied to the transfer element. Depending on a difference between the control object value detected by the detection element and a target value, the modification element operates modification of the set value. The switch element switches between a short interval mode and a long interval mode. In a short interval mode, an execution time interval for modification of the set value is shorter, while, in a long interval mode, the execution time interval for modification of the set value is longer.

REFERENCES:
patent: 6900994 (2005-05-01), Asayama
patent: 2004/0165902 (2004-08-01), Matsuura
patent: 2007/0008746 (2007-01-01), Inukai et al.
patent: 2007/0014129 (2007-01-01), Inukai
patent: 07-093039 (1995-04-01), None
patent: 2004037635 (2004-02-01), None
patent: 2007020367 (2007-01-01), None
patent: 2007049889 (2007-02-01), None
Notice of Reasons for Refusal for Japanese Patent Application No. 2007-216298 mailed Sep. 1, 2009.

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