Patent ID: 8000621

Claim:
An image forming apparatus, comprising: a transfer element; a supply element configured to supply electricity to said transfer element, said electricity depending on a set value; a detection element configured to detect a control object value, said control object value including either one of a voltage value and a current value, said control object value being supplied to said transfer element; a modification element configured to operate a modification of said set value, said modification depending on a difference between said control object value detected by said detection element and a target value; and a switch element configured to switch between a short interval mode and a long interval mode, wherein: an execution time interval for said modification of said set value by said modification element in said short interval mode is shorter than said execution time interval for said modification of said set value in said long interval mode, said switch element is configured to switch to said short interval mode in a time period when a recorded medium enters a transfer position in said transfer element, and said switch element is configured to switch to said long interval mode during a time period when said recorded medium is passing through said transfer position.