Patent ID: 8095052

Claim:
A developer supply device, comprising: a casing having: a developer reservoir provided at a bottom part of the casing to accommodate a developer; a developer amount adjustment chamber provided close to a side of the developer reservoir to communicate with a top portion of the developer reservoir; and a communication part through which the top portion of the developer reservoir and the developer amount adjustment chamber communicate with each other, the developer supply device further comprising: a carrying substrate having a plurality of electrodes arranged along a developer transport path to carry the developer along the developer transport path through a traveling electric field, each of the plurality of electrodes having a longer side extending in a width direction of the developer reservoir interesting with the developer transport path, and a developer providing unit configured to provide the developer into the developer reservoir, wherein the carrying substrate comprises an upper carrying substrate that is provided on an inner wall of the casing on an opposite side of the communication part, and is provided to carry the developer upward along the developer transport path.