raster scanning apparatus in accordance with the invention which includes a fixed xerographic processor unit indicated by the reference numeral 2 and a movable raster scanning unit indicated by the reference numeral 4 the xerographic processor is arranged as a self contained unit having all of its processing stations located in a unitary enclosure or cabinet the xerographic processor unit includes an exposure station having a transparent platen 12 on which a document to be reproduced is positioned for optical projection onto a photoconductive surface in the form of a xerographic belt 13 imaging light rays from the document to be reproduced which is flash illuminated by lamps 18 are projected by a first mirror 20 a projection lens 21 and another mirror 23 onto the xerographic belt 13 at the focal plane for the lens 21 at a position indicated by the dotted line 25 the xerographic belt 13 is mounted for movement around three parallel arranged rollers 27 suitably mounted in the processor unit 2 the belt 13 may be continuously driven at an appropriate speed by a suitable motor not shown exposure of the belt to the imaging light rays from the document discharges the photoconductive layer in the areas struck by light whereby there remains on the belt 13 an electrostatic latent image corresponding to the light image projected from the document as the belt 13 continues its movement the electrostatic latent image passes a developing station at which there is positioned a developer apparatus 29 for developing.