XEROGRAPHIC DEVELOPING APPARATUS

摘要

IMPROVED XEROGRAPHIC DEVELOPING APPARATUS An apparatus for developing a latent xerographic image is disclosed. The development device comprises a toner supporting donor member adjacent, and in spacedrelationship to, an image retaining member. Means are also provided to apply a pulsed electrical bias to the donor member to introduce an electrical field in the gap between the donor and image retaining member whereby the electroscopic particles are made more readily available to the charged image thereby resulting in fine image development. The electric field applied across the gap is a result of a pulsed bias applied in such a manner so as to enable toner to deposit on the electrostatic image and to reduce deposition in non-image areas of the xerographic plate. The instant donor development system results in excellent copy quality with reduced background development.