Xerographic Discharge Characteristics of Photoreceptors. II

Abstract

The xerographic discharge characteristics under space‐charge‐perturbed conditions have been studied theoretically. The surface potential at time t, V(t), and dV/dt are calculated by numerical iterations, as functions of the carrier emission efficiency, carrier mobility, optical density of the photoreceptor, light flux, and exposure time. It is observed that, unlike the case of emission‐limited discharge, the carrier mobility is as important as (sometimes more than) the emission efficiency in determining the speed of discharge. A large field dependence in mobility leads to a high residual potential. An exposure with penetrating light (carrier emission in the bulk) has been found to lift the space‐charge limitation and lower the residual potential. In the case of flash exposure with strongly absorbed light, where analytical calculation of the discharge characteristic is possible, the numerical iterative method yields results in excellent agreement with the analytical ones.