Patent ID: 9740137
Date: 2017-08-22
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: an image bearing member; a developing device that is disposed along a rotation direction with respect to the image bearing member, includes a first developer bearing member and a second developer bearing member which bears a developer, and regulates the developer of the second developer bearing member by the first developer bearing member by disposing the first developer bearing member disposed on an upstream side in the rotation direction of the image bearing member and the second developer bearing member disposed on a downstream side in the rotation direction of the image bearing member with a gap therebetween in a non-contact manner; a bias application portion that is used to apply a first developing bias to the first developer bearing member and apply a second developing bias to the second developer bearing member, the first developing bias containing a direct current bias and an alternating current bias in a superimposing manner, the second developing bias containing a direct current bias and an alternating current bias in a superimposing manner; and a controller that controls at least one of the alternating current bias of the first developing bias applied to the first developer bearing member and the alternating current bias of the second developing bias applied to the second developer bearing member, wherein the controller is configured to be able to execute a mode in which a first difference between an amplitude of the alternating current bias of the first developing bias applied to the first developer bearing member and an amplitude of the alternating current bias of the second developing bias applied to the second developer bearing member at a time of non-image formation is set to be large compared to a second difference between an amplitude of the alternating current bias of the first developing bias applied to the first developer bearing member and an amplitude of the alternating current bias of the second developing bias applied the second developer bearing member at a time of image formation.