ELECTROPHOTOGRAPHIC SYSTEM, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC PHOTOSENSITIVE BODY UNIT

摘要

In an electrophotographic apparatus in which a beam spot has been made to have a small spot diameter by the use of a laser having an oscillation wavelength within the range of from 380 nm to 450 nm, it enables image reproduction at ultra-high resolution and in ultra-high image quality. In an electrophotographic apparatus which has I) an electrophotographic photosensitive member unit having i) an electrophotographic photosensitive member having a photosensitive layer on a cylindrical support and ii) fitting members fitted to the end portions of the electrophotographic photosensitive member and II) an exposure means having a laser having an oscillation wavelength within the range of from 380 nm to 450 nm, and in which a spot diameter Di ( mu m) of a beam spot formed on the surface of the electrophotographic photosensitive member by a laser beam emitted from the laser is 40 mu m or less, cylinder deflection De ( mu m) of the electrophotographic photosensitive member unit is 1.5 times or less the spot diameter Di ( mu m) of the beam spot.