XEROGRAPHIC PRINTER/COPIER DEVICE WITH CONVERTER FOR CONVERTING INFORMATION FROM A LATENT IMAGE OF AN ORIGINAL DOCUMENT INTO ELECTRICAL SIGNALS

摘要

A xerographic printer/copier includes a photoconductor drum (4), means for producing a latent image, from an original document, on the drum and a laser beam scanning system (24, 25, 28 and 27) normally employed to produce such a latent image in response to input digital data. The system also includes a detector (30) placed adjacent the photoconductor drum at the laser scanning position. This detector is employed to produce signals representing a latent image on the drum produced by sensing the change in charge on the drum when the latent image is scanned by the laser beam (26) in an unmodulated condition.