Patent ID: 7574157
Filing Date: 2009-08-11
Classification: G03G

Abstract:
1. An image formation device comprising: an image-bearing body that rotates; a charging roller that contacts the image-bearing body and is rotated by the rotation of the image-bearing body, and charges the image-bearing body; a cleaning roller that contacts the charging roller and is rotated by the rotation of the charging roller, and cleans the charging roller; and a first auxiliary roller that is provided coaxially with the charging roller, contacts the image-bearing body and is rotated by the rotation of the image-bearing body, wherein the image formation device satisfies the following relation: where F 1 represents a friction force between the first auxiliary roller and the image-bearing body, F 2 represents a friction force between the image-bearing body and the charging roller and F 3 represents a friction force between the charging roller and the cleaning roller.