Image forming apparatus

Details Image forming apparatus Image forming apparatus

2005-10-04

2005-10-04

Ngo, Hoang (Department: 2852)

Electrophotography

Control of electrophotography process

Control of transfer

C399S044000, C399S313000, C399S314000

Reexamination Certificate

active

06952539

ABSTRACT:
In an image forming apparatus having an image forming portion for forming an image on an image bearing member, a transferring portion provided with a transferring member capable of contacting with the image bearing member and a voltage applying portion for applying a voltage to the transferring member, and for electrostatically transferring the image on the image bearing member to a transferring medium, an electric current detecting portion for detecting an electric current flowing to the transferring member, and a control portion for performing an electric current detecting operation of detecting an electric current flowing when the voltage applying portion applies a predetermined voltage before an image transferring operation by the electric current detecting portion, and determining a transfer voltage applied to the transferring member during the image transferring operation on the basis of a result of the detection by the electric current detecting operation, the electric current detecting operation is performed a plurality of times, and a time required for an electric current detecting operation performed before a certain electric current detecting operation performed at and after the second time is shorter than a time required for the certain electric current detecting operation.

REFERENCES:
patent: 5450180 (1995-09-01), Ohzeki et al.
patent: 5822651 (1998-10-01), Yim et al.
patent: 5915145 (1999-06-01), Shimura et al.
patent: 6266495 (2001-07-01), Yuminamochi et al.
patent: 6782215 (2004-08-01), Komori
patent: 2-123385 (1990-05-01), None
patent: 5-181373 (1993-07-01), None

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