Patent ID: 8298733

Claim:
An electrophotographic photosensitive member, that is mountable in an electrophotographic apparatus including a coherent exposure light source, comprising: a conductive substrate having a roughened surface which is roughened by a sand blasting process to provide a sand-blast-roughened surface; a metal oxide-containing undercoat layer coated on the sand-blast-roughened surface and having a film thickness d within a range of 1.5 μm≦d≦3.5 μm; and an organic photosensitive layer coated on the metal oxide-containing undercoat layer; wherein the electrophotographic photosensitive member satisfies a condition Sp≦10, and Sp is determined by (a) measuring a surface reflectance of coherent light from the electrophotographic photosensitive member at a plurality of predetermined wavelength intervals of width Δλ within a wavelength range of 750 nm≦λ≦812 nm to obtain a measured surface reflectance; (b) correcting the measured surface reflectance to obtain a corrected reflectance I opc of the electrophotographic photosensitive member, by taking a mirror-surface conductive substrate reflectance as a reference, and subjecting the corrected reflectance to a discrete Fourier transformation according to a following equation (1) and calculating, from a result of the equation (1), a power spectrum |S(n/(N·Δλ)| 2 according to a following equation (2) S ⁡ ( n N · Δ ⁢ ⁢ λ ) = ∑ m = 0 N - 1 ⁢ I OPC ⁡ ( m · Δ ⁢ ⁢ λ ) ⁢ exp ⁡ ( - ⅈ2π · n N · Δ ⁢ ⁢ λ · m · Δ ⁢ ⁢ λ ) = a + bi ( 1 ) wherein i represents √−1, n and m represent integers, and N represents N=2 s (s=1, 2, . . . , u);  S ⁡ ( n N · Δλ )  2 = a 2 + b 2 ; ( 2 ) and (c) determining a peak value of the power spectrum |S(n/(N·Δλ))| 2 within a frequency range of 0<n/(N·Δλ(Hz)≦2.5×10 8 ; and (d) setting the peak value of the power spectrum |S(n/(N·Δλ))| 2 equal to Sp.