Apparatus and method for synchronizing exposure of a document onto a photosensitive member

摘要

An electrostatic reproduction machine with a photosensitive member on which latent electrostatic images of an original being reproduced are made following charging of the member. A transparent platen supports the original with one or more lamps being provided to flash illuminate the original resting on the platen. The light image produced is transmitted by an optical system to an image frame of a moving photosensitive member to discharge the same selectively in accordance with the original. A movable optical system is provided to permit the light image to be projected onto and move with the moving photosensitive member to reduce image smear. The photosensitive member includes a perforation to define the location of the image frame. Exposure of the image frame with illumination of the flash lamps is timed by sensing an image of the perforation at the platen.