Patent attributes
An image-forming device which facilitates, with a simple structure, the realization of suitable transfer condition control in more situations is disclosed. While the transfer voltage applied to a transfer member such as a transfer roller is detected by a transfer voltage detector, the transfer current is detected by a transfer current detector, and these are transmitted to a CPU. The CPU determines the target current which is to be the control target from the transfer voltage and transfer current, and drives a step-up circuit so as to perform constant current control based on the target current which has been determined. By calculating the target current using calculation formulas which differ by transfer voltage range, suitable transfer condition control under more environments and conditions can be realized.
