Patent ID: 7071962

Claim:
An electrophotographic apparatus comprising: I) an electrophotographic photosensitive member unit comprising: i) an electrophotographic photosensitive member comprising: a cylindrical support; and a photosensitive layer provided on said cylindrical support; and ii) fitting members configured and positioned to drive said electrophotographic photosensitive member rotatingly in said electrophotographic apparatus and fitted to end portions of said electrophotographic photosensitive member; and II) an exposure device comprising a laser having an oscillation wavelength within the range of from 380 nm to 450 nm, wherein the spot diameter Di of a beam spot formed on the surface of said electrophotographic photosensitive member by a laser beam emitted from said laser is 40 μm or less, wherein the spot diameter Di of the beam spot formed on the surface of said electrophotographic photosensitive member by the laser beam emitted from said laser is an average value of a primary scanning direction spot diameter and a secondary scanning direction spot diameter, and wherein the cylinder deflection De of said electrophotographic photosensitive member unit is 0.68 times or less the spot diameter Di of the beam spot.