ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGEAND ELECTROPHOTOGRAPHIC APPARATUS

摘要

In an electrophotographic photosensitive member comprising a cylindrical support, and provided thereon a photosensitive layer and a protective layer in this order, which cylindrical support has an outer diameter of less than 30 mm, the difference between a coefficient of thermal expansion .alpha.1 measured from the top of the protective layer and a coefficient of thermal expansion .alpha.2 measured after the protective layer has been removed, ¦.alpha.1 - .alpha.2¦, is more than 5.0 .times. 10-7 .degree.C-1 to less than 1.0 .times. 10-4 .degree.C-1, and the modulus of elastic deformation We% measured from the top of the protective layer is more than 30% to less than 60%. Also disclosed are a process cartridge and an electrophotographic apparatus which have such an electrophotographic photosensitive member.