Image transfer device for an image forming apparatus

An image transfer device in which a transfer belt is rotated and applied with a charge from a first electrode in contact with said transfer belt to transfer a toner image from an image carrier to said transfer belt, said device comprising:

• a second electrode contacting said transfer belt;
• and
• a resistance element connected between said second electrode and ground, wherein said resistance element comprises a variable resistance element, said device further comprises control means for producing a ratio of a voltage applied from the first electrode to said transfer belt to an output current from said first electrode to said transfer belt and for controlling a resistance of said variable resistance element such that said ratio has a predetermined value.

An image transfer device in which a transfer belt is rotated and applied with a charge from a first electrode in contact with said transfer belt to transfer a toner image from an image carrier to a transfer medium carried on said transfer belt, said device comprising:

• a second electrode contacting said transfer belt;
• and
• a resistance element connected between said second electrode and ground, wherein said resistance element comprises a variable resistance element, said device further comprising control means for producing a ratio of an output current from the first electrode to said transfer belt and a current from said transfer belt to said second electrode and for controlling a resistance of said variable resistance element such that said ratio has a predetermined value.

An image transfer device in which a transfer belt is rotated and applied with a charge from a first electrode in contact with said transfer belt to transfer a toner image from an image carrier to said transfer belt, said device comprising:

• a second electrode contacting said transfer belt;
• and
• a resistance element connected between said second electrode and ground, wherein said resistance element comprises a variable resistance element, said device further comprising control means for producing a ratio of an output current from the first electrode to said transfer belt and a current from said transfer belt to said second electrode, and for controlling a resistance of said variable resistance element such that said ratio has a predetermined value.