Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

A process cartridge integrally supporting a cylindrical electrophotographic photosensitive member and at least one unit selected from the group consisting of a charging unit, a developing unit, and a cleaning unit, and being detachably attachable to a main body of an electrophotographic apparatus,

• the electrophotographic photosensitive member having a support and a surface layer, and
• having a region A along an outer surface of the surface layer and a region B along the outer surface of the surface layer,
• the region A being located on an end side in an axial direction of the electrophotographic photosensitive member relative to the region B,
• the region A having a groove provided on the outer surface of the electrophotographic photosensitive member,
• an average value d1 of a depth of the groove being 0.3 μm to 5.0 μm,
• a width of the groove in a circumferential direction of the electrophotographic photosensitive member being 500 μm or more,
• an average value W1 of the width of the groove in the axial direction of the electrophotographic photosensitive member being 2 μm to 50 μm,
• an area ratio a1 of the groove being 65% to 100%,
• the region B having concave portions provided on the outer surface of the electrophotographic photosensitive member,
• an average value d2 of a depth of the concave portion being 0.3 μm to 1.5 μm,
• an average value L1 of a width of the concave portion in the circumferential direction of the electrophotographic photosensitive member being 20 μm to 200 μm,
• an average value W2 of the width of the concave portion in the axial direction of the electrophotographic photosensitive member being equal to or less than the L1,
• an area ratio a2 of the concave portion being 5% to 65%, and
• the area ratio a1 of the groove being larger than the area ratio a2 of the concave portion.

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, in an axial direction of the electrophotographic photosensitive member, an end of an image-formable region of the electrophotographic photosensitive member being within a range of the region B,

• the electrophotographic photosensitive member having a support and a surface layer, and
• having a region A along an outer surface of the surface layer and a region B along the outer surface of the surface layer,
• the region A being located on an end side in an axial direction of the electrophotographic photosensitive member relative to the region B,
• the region A having a groove provided on the outer surface of the electrophotographic photosensitive member,
• an average value d1 of a depth of the groove being 0.3 μm to 5.0 μm,
• a width of the groove in a circumferential direction of the electrophotographic photosensitive member being 500 μm or more,
• an average value W1 of the width of the groove in the axial direction of the electrophotographic photosensitive member being 2 μm to 50 μm,
• an area ratio a1 of the groove being 65% to 100%,
• the region B having concave portions provided on the outer surface of the electrophotographic photosensitive member,
• an average value d2 of a depth of the concave portion being 0.3 μm to 1.5 μm,
• an average value L1 of a width of the concave portion in the circumferential direction of the electrophotographic photosensitive member being 20 μm to 200 μm,
• an average value W2 of the width of the concave portion in the axial direction of the electrophotographic photosensitive member being equal to or less than the L1,
• an area ratio a2 of the concave portion being 5% to 65%, and
• the area ratio a1 of the groove being larger than the area ratio a2 of the concave portion.