Patent ID: 8843024

Claim:
An electrophotographic photosensitive member comprising: a cylindrical support; and a photosensitive layer disposed on the cylindrical support, wherein, a peripheral surface of the electrophotographic photosensitive member has: a plurality of flat portions having a width e (μm) that satisfies the relationship 0.1≦e≦25, and a plurality of groove portions having a width w (μm) that satisfies the relationship 0.1≦w≦25 and a depth d (μm) that satisfies the relationship 0.1≦d≦3.0, the flat portions and the groove portions are alternately formed, each of the plurality of flat portions extends continuously without any intersecting groove portions in a circumferential direction across the entire electrophotographic photosensitive member, the sum e sum (μm) of the widths e of the flat portions per each width of 100 μm in the axial direction of the peripheral surface satisfies the relationship 10≦e sum ≦50; and e σ /e Av satisfies the relationship e σ /e Av ≦0.46, where e Av (μm) is an average value of the widths e of the flat portions, and e σ is a standard deviation thereof.