Patent ID: 8660459

Claim:
A drum unit comprising: an electrophotographic photosensitive member comprising: a base member; and a photosensitive layer proximate a surface of the base member; a cleaning blade configured to abut at least a portion of a surface of the photosensitive layer and to remove a developer remaining on the photosensitive layer; and a side seal disposed at each end of the cleaning blade to inhibit leakage of the developer, wherein the photosensitive layer is not disposed at an end portion of the surface of the base member, and at least one of the side seals is in contact with (i) a surface region of said surface of the photosensitive layer, the surface region facing a direction faced by the portion of the surface abutted by the cleaning blade, and (ii) an end portion of the photosensitive layer, the end portion facing a direction different from the direction faced by said surface region.