Photosensitive drum and process cartridge

摘要

A photosensitive drum for use with an image forming apparatus includes a cylinder, having a photosensitive layer at its surface, to which process units are contacted, a supporting shaft extending through the cylinder, and a flange provided at a longitudinal end portion of the cylinder. The flange includes a supporting portion supporting an inner peripheral portion of the cylinder within a contact area at which the process units contact the cylinder, and a first supported portion supported by the supporting shaft, with the first supported portion disposed further from the longitudinal end portion of the cylinder than the supporting portion. In addition, a second supported portion is supported by the supporting shaft and is disposed closer to the longitudinal end portion of the cylinder than the supporting portion. A clearance portion is provided between the first supported portion and the second supported portion with respect to a longitudinal direction of the cylinder.

主权项

1. A photosensitive drum for use with an image forming apparatus, comprising:
a cylinder, having a photosensitive layer at its surface, to which process means is contacted; a supporting shaft extending through said cylinder; and a flange provided at a longitudinal end portion of said cylinder, said flange having a radially inner side and a radially outer side, the radially inner side being disposed closer to said supporting shaft, wherein said flange includes:
a supporting projection disposed on the radially outer side of said flange and supporting an inner peripheral portion of said cylinder with a longitudinal region corresponding to a direct contact area at which the process means is in direct contact with said cylinder,a first supported projection disposed on the radially inner side of said flange and supported by said supporting shaft, said first supported projection disposed further from said longitudinal end portion of said cylinder than said supporting projection,a second supported projection disposed on the radially inner side of said flange and supported by said supporting shaft, said second supported projection disposed closer to said longitudinal end portion of said cylinder than said supporting projection, anda clearance provided between said first supported projection and said second supported projection with respect to a longitudinal direction of said cylinder, wherein with respect to the longitudinal direction of said cylinder, said supporting projection is provided at a position overlapping with said clearance, not overlapping with said first supported projection, and not overlapping with said second supported projection.