Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

A process cartridge that integrally supports a cylindrical electrophotographic photosensitive member and a cleaning unit having a cleaning blade disposed in contact with the electrophotographic photosensitive member, and which is detachably attachable to a main body of an electrophotographic apparatus, the electrophotographic photosensitive member comprising:

• a concave/convex portion forming region in which at least one of concave portions and convex portions are formed on a surface of the electrophotographic photosensitive member from a central portion to both end portions in an axial direction of the electrophotographic photosensitive member, wherein
• 0.011≤(Lmax−Lmin)/Lmax≤0.087 and 0.100≤(Lmax−Lmin)/P≤0.333
• where Lmax and Lmin are respectively maximum and minimum values of a distance L from the central portion to one end portion of the concave/convex portion forming region in the axial direction of the surface of the electrophotographic photosensitive member, and P is a diameter of the electrophotographic photosensitive member, and
• a ratio of an area of the concave/convex portion forming region to an area of region A is 20 to 80% where region A is a region in an axial end portion of the surface of the electrophotographic photosensitive member that is sandwiched between a surface perpendicular to the axial direction of the electrophotographic photosensitive member at an end position of the concave/convex portion forming region where Lmin is measured, and a surface perpendicular to the axial direction of the electrophotographic photosensitive member at an end position of the concave/convex portion forming region where Lmax is measured.

An electrophotographic apparatus, comprising:

• a cylindrical electrophotographic photosensitive member, a charging unit, an exposing unit, a developing unit, a transfer unit, and a cleaning unit having a cleaning blade disposed in contact with the electrophotographic photosensitive member;
• and
• the electrophotographic photosensitive member comprising a concave/convex portion forming region in which at least one of concave portions and convex portions are formed on a surface of the electrophotographic photosensitive member from a central portion to both end portions in an axial direction of the electrophotographic photosensitive member, wherein
• 0.011≤(Lmax−Lmin)/Lmax≤0.087 and 0.100≤(Lmax−Lmin)/P≤0.333
• where Lmax and Lmin are respectively maximum and minimum values of a distance L from the central portion to one end portion of the concave/convex portion forming region in the axial direction of the surface of the electrophotographic photosensitive member, and P is a diameter of the electrophotographic photosensitive member, and
• a ratio of an area of the concave/convex portion forming region to an area of region A is 20 to 80% where region A is a region in an axial end portion of the surface of the electrophotographic photosensitive member that is sandwiched between a surface perpendicular to the axial direction of the electrophotographic photosensitive member at an end position of the concave/convex portion forming region where Lmin is measured, and a surface perpendicular to the axial direction of the electrophotographic photosensitive member at an end position of the concave/convex portion forming region where Lmax is measured.