| 摘要 |
A method of developing a latent electrostatic image using a two-component developer system, having a ratio (VrNVp) ranges 1.2<(Vr/Vp)<3 where the (Vp) is a linear speed (Vp) [m/sec] of a photosensitive member and the (Vr) is a linear speed (Vr) [m/sec] of a developing sleeve, and applying a biased direct-current (VB) [by volt] wherein; a developing gap(Gp)[cm] as a distance at the nearest point between a photosensitive member and a developing sleeve is less than or equal to 0.6 mm, a ratio(rhop/rhoa) satisfies an expression (rhop/rhoa)<0.7 where the rhop is a density[g/ cm3] of a developer at the nearest point between a photosensitive member and a developing sleeve, which is represented by an equation rhop=J/Gp where J is an amount of developer scooped up (the rhop is also expressed as "the density of the developer" or "the density of GP agent" in the specification) and the rhoa is a bulk density[g/ cm3 ] of the developer, a carrier for electrophotography is used, the carrier made of a carrier core particles having a weight average particle diameter(Dv) ranging from 25 mum to 45 mum, the particles of smaller than 44 mum are more than or equal to 70 percent by weight, the particles of smaller than 22 mum are less than or equal to 7 percent by weight, a ratio (Dv/Dp) between the weight average particle diameter (Dv )and the number average particle diameter(Dp) satisfies an expression 1<=(Dv/Dp)<=1.30, the core particles are used by coated form with a resin material. The method is provided for eliminating undesired artifacts in the developed image derived from to the developing direction (where the traveling speed of the developing sleeve is faster than that of the latent electrostatic image).
|
