Patent ID: 7450882

Claim:
A developer cartridge that is attachable to and detachable from a photosensitive drum cartridge, the developer cartridge comprising: a frame including a first side wall and a second side wall, the first side wall and the second side wall extending substantially in a length direction; a developer housing section for housing a developer, the developer housing section extending from the first side wall to the second side wall in a width direction perpendicular to the length direction; a developer supplying section for supplying the developer to a photosensitive member, the developer supplying section extending from the first side wall to the second side wall in the width direction; and a guide member provided over an outer surface of the developer supplying section, the guide member being detachable from the developer supplying section; wherein the developer supplying section is formed from a first material, the guide member is formed from a second material, and the first material is different from the second material.