Patent ID: 8774671

Claim:
A developing cartridge comprising: a cartridge frame; a developer carrier having a surface configured to carry a developer agent and a rotation shaft made from an electrically conductive material, the rotation shaft defining an axial direction and having an axial end portion; a bearing member provided at the cartridge frame and rotatably supporting the rotation shaft; and a collar member provided at a position outside of the bearing member in the axial direction and movable relative to the bearing member in the axial direction, the collar member being rotatable relative to the rotational shaft of the developer carrier, the collar member comprising: a cap portion covering the axial end portion of the rotation shaft and electrically contacted with the rotation shaft, the cap portion being made from an electrically conductive material; and a power-feed receiving portion made from an electrically conductive material and electrically contactable with an external electrode, the power-feed receiving portion being provided integrally with the cap portion.