Patent ID: 6285848
Filing Date: 2001-09-04
Classification: G03G

Abstract:
An electrophotographic apparatus, comprising:an electrophotographic photosensitive member; and(i) charging means for charging said electrophotographic photosensitive member, (ii) imagewise exposure means for exposing said electrophotographic photosensitive member to light, (iii) developing means for developing an image formed on the electrophotographic photosensitive member and (iv) transfer means for transferring the developed image onto a transfer medium, disposed in this order opposite to the electrophotographic photosensitive member, whereinsaid charging means includes a charging member comprising magnetic particles disposed in contact with the electrophotographic photosensitive member so as to charge the electrophotographic photosensitive member based on a voltage received thereby,said magnetic particles are surface-coated with a coupling agent having a linear alkyl group having at least 6 carbon atoms, andsaid developing means also functions to recover residual toner remaining on the electrophotographic photosensitive member after processing by the transfer means and the charging means,wherein the developing means supplies a toner containing an external additive, the toner has a weight-average particle size of 1-9 .mu.m, and the external additive has a weight-average particle size of 0.012-0.4 .mu.m.