Abstract: A process and apparatus for forming an electrostatic image on a photosensitive plate having a conductive base, a photoconductive layer overlying the base and exhibiting p-type or n-type semiconductivity, and an insulative layer overlying the photoconductive layer. The photosensitive plate is characterized in having carrier charge of a polarity corresponding to the conductivity type of the photoconductive layer injectable from the conductive base into the photoconductive layer and bound in the region of the interface between the insulative and photoconductive layers. The conductive base is transparent to activating light and the insulative layer is opaque to the activating light. A first charge of a polarity opposite to the conductivity type of the photoconductive layer is applied onto the insulative layer to inject and bind carrier charge in the region of the interface between the insulative and photoconductive layers.

Abstract: A process for forming an electrostatic image on a plate having a conductive base, a photoconductive layer exhibiting p-type or n-type semiconductivity and a covering insulative layer, said photosensitive plate being characterized in having carrier charge of a polarity corresponding to the conductivity type of said photoconductive layer injectable from said conductive base into said photoconductive layer and bound in the region of the interface between said insulative and photoconductive layers, wherein the covering insulative layer is initially charged with a polarity opposite to the conductivity type of said photoconductive layer to inject and bind charge carrier in the region of the interface between said insulative photoconductive layers, then the photoconductive layer is exposed to a pattern of image light, while a corona discharge of a polarity opposite to the first charge is applied onto the insulative layer, and then the photoconductive layer is exposed to activating light to discharge bound carrier ch

Abstract: An A.C. corona discharging device for use in the process in which discharge and exposure are accomplished contemporaneously has insulating members disposed so as to surround the discharge wire or electrode and define the opening for projecting the image of an original. The potential gradient is increased, the discharge efficiency is improved and the flow of useless current which heretofore traveled through the shielding electrode is not encountered.