Abstract: In a xerographic printing apparatus, a scorotron places a uniform charge on a photoreceptor for forming electrostatic latent images. Three conductive pin arrays are disposed in a housing defined by sidewalls and a screen adjacent the photoreceptor. There can be provided insulative walls between adjacent pin arrays. The screen and a surface of the housing can be curved to correspond to a curvature of the photoreceptor.

Abstract: A ghosting preventing development process cartridge detachably mountable into an electrostatographic reproduction machine is provided. The ghosting preventing development process cartridge includes a housing having walls defining a partially enclosed storage chamber for storing developer material, and a development opening into the storage chamber. The ghosting preventing development process cartridge also includes a donor roll, mounted rotatably outside the chamber and near the development opening, for receiving a layer of developer material from the storage chamber, and for donating portions of such developer material layer within a development nip to image areas of an image being developed thus leaving a spent developer layer on the donor roll downstream of the development nip.