Abstract
We have developed a numerical method to calculate the particle dynamics in electrophotographic two-component development system using Distinct Element Method(DEM).A characteristic of the method is that takes it account of particle conductivity and electric conduction in chains of carrier particles.Calculated results qualitatively agreed to the experimental results with respect to the amount of developed toner particles and the basic property of the Bead-Carry-Out(BCO)phenomenon under the varied contact condition between magnetic brush and photoconductor and the speed ratio between the development sleeve and photoconductor drum.