Patent ID: 8676070

Claim:
An image forming apparatus comprising a plurality of toner image forming sections; a transfer body; a plurality of transfer members, each of which is provided corresponding to each of the toner image forming sections, to transfer toner images formed in the toner image forming sections onto the transfer body; a density sensor, arranged on a downstream side of the transfer members with respect to a moving direction of the transfer body, to measure a density of a toner image on the transfer body; and a control section, wherein the plurality of transfer members have a first transfer member arranged on an upstream side with respect to the moving direction of the transfer body and a second transfer member arranged on a downstream side from the first transfer member with respect to the moving direction of the transfer body; and the control section controls in a state where a transfer voltage is applied in the first transfer member and no transfer voltage is applied in the second transfer member, to form a first toner image on the transfer body by transferring a first toner image having been formed in a first toner image forming section arranged on an upstream side with respect to the moving direction of the transfer body among the toner image forming sections onto the transfer body, and to measure a first density of the first toner image using the density sensor, to apply transfer voltages in the first transfer member and the second transfer member, to form a second toner image on the transfer body by transferring a second, toner image having been formed in the first toner image forming section onto the transfer body, and to measure a second density of the second toner image using the density sensor and to determine a transfer current in each of the first transfer member and the second transfer member by the first density and the second density.