Patent ID: 7224923

Claim:
A developer cartridge capable of attachment to a photosensitive member cartridge, the photosensitive member cartridge including a photosensitive member and an accommodating portion where the developer cartridge is capable of being accommodated, the accommodating portion including a bottom wall extending in a horizontal direction, the developer cartridge comprising: a cartridge case; and a developer roller accommodated in the cartridge case; wherein: the cartridge case comprises a developing chamber accommodating the developer roller at a front portion of the cartridge case and a developing agent case capable of accommodating a developing agent at a rear portion of the cartridge case; the cartridge case includes a bottom surface; the bottom surface is provided with a plurality of ribs at the front portion of the cartridge case; and the plurality of ribs are configured so as to provide a path by which a recording medium can be conveyed between the bottom surface of the cartridge case and the bottom wall of the photosensitive member cartridge at the front portion of the cartridge case when the developer cartridge is accommodated in the accommodating portion of the photosensitive member cartridge.