Patent ID: 7742712
Filing Date: 2010-06-22
Classification: G03G

Abstract:
1. An image forming apparatus for transferring a toner image onto a sheet by applying a transfer bias voltage to the sheet through a transfer member, comprising: a roughness information acquiring unit configured to acquire information relating to a surface roughness of the sheet; a sheet information acquiring unit configured to acquire information relating to an electric resistance of the sheet; an environment detecting unit configured to detect a humidity as an installation environment of the image forming apparatus; a voltage calculating unit configured to calculate a transfer bias voltage based on the information acquired by the sheet information acquiring unit and the humidity detected by the environment detecting unit; a voltage correcting unit configured to correct a voltage value of the transfer bias voltage calculated by the voltage calculating unit based on the information acquired by the roughness information acquiring unit, so that a transfer current flowing to the sheet at a time when the toner image is transferred onto the sheet becomes a specified optimum current value; and a voltage control unit configured to apply the transfer bias voltage of the voltage value corrected by the voltage correcting unit.