Patent ID: 8126378

Claim:
A developing device, comprising: a developer container for containing developer including toner and carrier; a toner-supplying developer supporting member for supporting on a surface thereof the developer in the developer container to convey the developer; a toner supporting member for supporting toner received from the toner-supplying developer supporting member and conveying the toner to develop an electrostatic latent image on an image supporting member; a toner-collecting developer supporting member for being supplied with the developer from the toner-supplying developer supporting member and collecting a post-development residual toner from the toner supporting member into the developer; a toner separation member which is configured to contact with the toner-collecting developer supporting member through the developer on the toner-collecting developer supporting member; and a power supply for applying a bias voltage to the toner separation member, wherein the power supply forms an electric field between the toner separation member and the toner-collecting developer supporting member in such a direction as to pull away toner in the developer on the toner-collecting developer supporting member from the toner-collecting developer supporting member.