Electrophotographic process and apparatus for making plural copies from a single image

An electrophotographic process for forming at least one copy of a document by means of an electrophotographic photosensitive member including an electrically conductive substrate, a first photoconductive layer applied on the substrate, a charge retentive layer made of electrically insulating material and applied on the first photoconductive layer and a second photoconductive layer applied on the charge retentive layer, comprising

• the step of projecting an image of the document to be duplicated onto the photosensitive member with the aid of a first light to which the second photoconductive layer is substantially insensitive, but the first photoconductive layer is sensitive, while the photosensitive member is charged;
• the step of uniformly exposing the photosensitive member to said first light, said exposing step being effected after said image projecting step;
• and
• the step of uniformly exposing the photosensitive member to second light to which said second photoconductive layer is sensitive, whereby an electrostatic charge image is formed in said photosensitive member by means of electrostatic charges trapped across said charge retention layer.