Abstract
An electrical simulation program of 2-dimensional charging roller system is developed in order to make clear the discharge phenomena and charging property of the roller. The Poisson equation of electrostatic field and the Ohm law are solved using the finite difference method on the boundary-fitted coordinate system, and the amount of charge deposited on the photoconductor is estimated from the Paschen law. The numerical results show good agreement with the theoretical and the experimental results. In case of low resistive roller biased DC voltage, discharge happens only in the entrance of the nip between the roller and photoconductor. On the other hand, in case of resistive roller biased DC voltage, discharge happens in not only the entrance but also the exit of the nip.
