Patent ID: 8050575

Claim:
An image forming apparatus comprising: a first developing cartridge comprising a toner hopper, a supply roller, and a developing roller; a first photosensitive cartridge, the first developing cartridge being removably mounted in the first photosensitive cartridge, the first photosensitive cartridge comprising: a photosensitive drum on which an electrostatic latent image is formed; a charger that is provided at a position adjacent to the photosensitive drum and that charges the photosensitive drum; a first wall which is provided adjacent to the supply roller, a portion of the toner hopper, and a portion of the developing roller of the first developing cartridge when the first developing cartridge is mounted in the photosensitive cartridge, the first wall comprising a first opening; and a second wall which faces a portion of the first wall and is provided adjacent to the charger, the second wall comprising a second opening on an opposite side of the charger from the photosensitive drum, wherein a portion of a wall of the first developing cartridge projects through the first opening in the first wall of the first photosensitive cartridge.