Patent ID: 8088541

Claim:
An electrophotographic photosensitive member, comprising: a support; and a photosensitive layer provided on the support, wherein the photosensitive layer comprises a charge generation layer comprising a charge generation substance and a charge transport layer comprising a charge transport substance, wherein the charge generation layer comprises a polyvinyl acetal resin comprising a repeating structural unit represented by one of the following formulas (1) to (4): and wherein the charge generation layer comprises, as the charge generation substance, at least one of: a hydroxygallium phthalocyanine crystal having a strong peak at a Bragg angle in CuKα characteristic X-ray diffraction of 7.4°±0.3° and 28.2°±0.3°; and a mixture of four azo compounds, each represented by a different one of the following structural formulas (CGM-2) to (CGM-5):