Patent ID: 6253038
Filing Date: 2001-06-26
Classification: G03G

Abstract:
An image forming apparatus, comprising:an image bearing member;charging means for charging said image bearing member;image forming means for forming multiple-color toner images on said image bearing member which is charged by said charging means;an intermediate transfer member;voltage applying means for applying a voltage to said intermediate transfer member to sequentially transfer the multiple-color toner images which are formed on said image bearing member by said image forming means onto said intermediate transfer member at a transfer position in a superposing manner;wherein the multiple-color toner images which are transferred onto said intermediate transfer member by said voltage applying means are transferred onto a transfer material;wherein the voltage which is applied to said intermediate transfer member by said voltage applying means is constant-voltage-controlled;wherein there is a period when said image bearing member, which is charged by said charging means and on which no toner image is formed by said image forming means, and the toner image which is transferred onto said intermediate transfer member exist at the transfer position;current detecting means for detecting an electric current that flows in said voltage applying means when the voltage is applied to said intermediate transfer member by said voltage applying means during the period; andcontrol means for controlling at least one of a voltage which is applied to said charging means and the voltage which is applied to said intermediate transfer member by said voltage applying means based on a detection result by said current detecting means.