Patent ID: 6548218
Filing Date: 2003-04-15
Classification: G03G,Y10S

Abstract:
An electrophotographic apparatus, comprising:an electrophotographic photosensitive member, and (i) charging means, (ii) imagewise exposure means and (iii) developing means, said (i), (ii) and (iii) disposed in this order opposite to the photosensitive member, wherein said charging means includes a charging member comprising magnetic particles and disposed contactable to the photosensitive member so as to charge the photosensitive member based on a voltage received thereby, said photosensitive member has a surface layer comprising a charge injection layer, said charge injection layer containing lubricant particles and having a volume resistivity of 1Ã—1010 to 5Ã—1012 ohm.cm, and the magnetic particles comprise a ferrite component represented by the following formula (1): (Fe2O3)X(A)Y(B)Zâ€ƒâ€ƒ(1), wherein A is MnO, B denotes at least one metal oxide component selected from the group consisting of Na2O, K2O and SrO; X, Y and Z denote numbers representing mol ratios and satisfying the following conditions: 0.2Z and 0.02&lE;Z&lE;0.08.