Patent ID: 8750734

Claim:
A transfer device, comprising: an image bearing member to bear a toner image on a surface thereof within a predetermined image forming area; a transfer member disposed opposite the image bearing member, to form a transfer nip between the transfer member and the image bearing member through which the recording medium is conveyed and to transfer the toner image from the image bearing member onto the recording medium in the transfer nip; a test image detector disposed downstream from the transfer nip in the direction of conveyance of the recording medium to detect a density of a test image for adjustment of toner density formed outside the image forming area of the image bearing member; and a shield member disposed between the test image and the transfer member to shield the test image from an electrical field generated between the image bearing member and the transfer member, wherein the transfer member includes a roller having a roller shaft, and the shield member is disposed at opposed ends of the roller shaft in an area corresponding to an area outside the image forming area.