US 2004/0165902 A1 · Image forming apparatus

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.

Claims16

Dependent claims

An image forming apparatus having:

image forming means for forming an image on an image bearing member;
transferring means for electrostatically transferring the image on said image bearing member to a transferring medium;
said transferring means being provided with a transferring member capable of contacting with said image bearing member, and voltage applying means for applying a voltage to said transferring member;
electric current detecting means for detecting an electric current flowing from said voltage applying means to said transferring member;
and
control means for performing an electric current detecting operation of detecting the electric current flowing when said voltage applying means applies a predetermined voltage before an image transferring operation of said transferring means by said electric current detecting means, and determining a transfer voltage applied to said transferring member during the image transferring operation, on the basis of a result of the detection by said electric current detecting operation;
wherein said 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 said certain electric current detecting operation.

5 more elements

An image forming apparatus having:

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

5 more elements

Dependencies are inferred from the claim text.

Image forming apparatus

Life of this patent

Image forming apparatus

Life of this patent

Abstract

Claims16