Patent ID: 8909080

Claim:
An image forming apparatus comprising: an image bearing unit configured to bear toner images; an intermediate transfer belt configured to be movable and to bear the toner images transferred from the image bearing unit; a first inner roller disposed in contact with an inner surface of the intermediate transfer belt, and located downstream of the image bearing unit in a moving direction of the intermediate transfer belt; a second inner roller disposed in contact with the inner surface of the intermediate transfer belt, and located adjacent to and downstream of the first inner roller in the moving direction; a first opposing roller disposed opposite the first inner roller across the intermediate transfer belt to form a first nip therebetween; a second opposing roller disposed opposite the second inner roller across the intermediate transfer belt to form a second nip therebetween; a first voltage source configured to apply a voltage between the first inner roller and the first opposing roller to transfer the toner images from the intermediate transfer belt to a recording material; a second voltage source configured to apply a voltage between the second inner roller and the second opposing roller to transfer the toner images from the intermediate transfer belt to the recording material; an acquisition unit configured to acquire information associated with a moisture content in air; and a setting portion configured to set a voltage of the first voltage source and a voltage of the second voltage source during an image formation period so that, in a case where the information acquired by the acquisition unit indicates a first moisture content, a ratio of a current of the second voltage source to a current of the first voltage source is smaller than the ratio of the current in a case where the information indicates a second moisture content being less than the first moisture content.