Patent ID: 9141071
Filing Date: 2015-09-22
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image forming unit comprising a first image forming unit and a second image forming unit; and a controller, the first image forming unit including: the second image forming unit including: the controller being configured to selectively apply a plurality of transfer biases including a first transfer bias and a second transfer bias to each of the first transfer member and the second transfer member, the second transfer bias being larger than the first transfer bias, the controller being further configured to selectively apply a plurality of charging biases including a first charging bias, a second charging bias and a third charging bias to each of the first charging member and the second charging member, the first image bearing member having a first surface potential when the first charging bias is applied to the first charging member, the first image bearing member having a second surface potential higher than the first surface potential when the second charging bias is applied to the first charging member, the second image bearing member having the first surface potential when the first charging bias is applied to the second charging member, the second image bearing member having a third surface potential higher than the second surface potential when the third charging bias is applied to the second charging member, the controller applying the first charging bias to the first charging member and the second charging member when applying the first transfer bias to the first transfer member, and the controller applying the second charging bias to the first charging member and applying the third charging bias to the second charging member when applying the second transfer bias to the first transfer member.