| 主权项 |
1. An image forming apparatus comprising:
a photosensitive member; charging means for charging the photosensitive member with a charging member; exposure means for forming an electrostatic latent image on a surface of the charged photosensitive member; and developing means for supplying the photosensitive member on which the electrostatic latent image is formed with a toner to form a toner image on the surface of the photosensitive member, wherein: the charging member comprises an electro-conductive substrate and an electro-conductive resin layer,
the resin layer comprising a binder resin C and a resin particle that roughens a surface of the charging member,the resin particle having a plurality of pores inside thereof, and a surface of the charging member has a plurality of projections derived from the resin particle, and wherein: the toner comprises toner particles, each of which contains a binder resin T and a colorant, and inorganic fine particles, the inorganic fine particles are silica fine particles, the toner contains the silica fine particles in an amount of 0.40 parts by mass or more and 1.50 parts by mass or less based on 100 parts by mass of the toner particles, the silica fine particles are treated with 15.0 parts by mass or more and 40.0 parts by mass or less of a silicone oil based on 100 parts by mass of a silica raw material, and a fixation ratio (%) of the silicone oil on the basis of an amount of carbon is 70% or more, and a coverage ratio X1 of a surface of the toner by the silica fine particles, as determined by X-ray photoelectron spectrometer (ESCA), is 50.0 area % or more and 75.0 area % or less, and when a theoretical coverage ratio by the silica fine particles is X2, a diffusion index represented by the following formula 1 satisfies the following formula 2:
diffusion index=X1/X2 (formula 1)diffusion index≧−0.0042×X1+0.62 (formula 2). |
