Patent ID: 8750736
Filing Date: 2014-06-10
Classification: G03G

Abstract:
1. An image forming apparatus, comprising: an image carrying member configured to carry a toner image on a surface of the image carrying member; a nip forming member, contactable to the surface of the image carrying member carrying the toner image, configured to form a transfer nip between the nip forming member and the image carrying member; and a transfer bias outputting unit configured to output a transfer bias to set a transfer field at the transfer nip, the transfer bias transferring the toner image carried on the image carrying member to a recording medium passing through the transfer nip, wherein, when the toner image is transferred from the image carrying member to the recording medium, the transfer bias outputting unit is configured to output a transfer bias composed of a direct current (DC) component and an alternating current (AC) component, a least one of the DC component and the AC component subjected to a constant voltage control, and wherein when a constant current control is conducted at a timing other than when the toner image is being transferred from the image carrying member to the recording medium, a detection bias voltage at the transfer nip is detected, wherein the voltage of at least one of the DC component and the AC component is controlled based on the detection bias voltage detected during constant current control.