UNIFORM CHARGING METHOD AND APPARATUS USING AN ARRAY OF NEEDLE ELECTRODES

摘要

Charging method and apparatus for applying a uniform charge to a surface in which an array of needle electrodes is moved relative to the surface, and a source of relatively high electric potential is coupled to alternate ones of the electrodes on each pass in inverse order. The remaining alternate electrodes are coupled to a source of relatively low electric potential or ground. By switching the potentials on each pass a uniform charge is obtained. In one embodiment a lattice-type arrangement is utilized with alternate rows of electrodes offset from an adjacent row to provide the desired uniform charge.