DUAL IMAGE CONCEPT
Original Publication Date: 1985-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
Referring to the figure, an optical system, indicated generally at 10, includes a first projection lens 12 and a second auxiliary projection lens 14 with associated shutter 16. The two lenses are positioned between a document platen 18 and a photoreceptor belt 20, a portion of which is shown. Platen 18 has a 17" x 17" dimension; belt 20 has a width (into the page) of 14". A stop 22 is movable from a position to the right of the platen to a position underlying the platen. A second stop 24 is movable from an off-belt position to a position overlying the belt. In a first mode with shutter 16 in closed position shown and stops 22, 24 moved to their non-stop positions a document is placed on the platen, suitable flash illumination means (not shown) are engaged and a full frame image of the document is projected by lens 12 onto the surface of belt 20. In a second mode of operation, a document 26 up to 8 1/2" x 14" is placed over one half of the platen, as shown. Shutter 16 is moved out of the optical path and stops 22, 24 are placed into the positions shown. Upon energization of the illumination means each lens 12, 14 projects twin images of document 22 onto the surface of belt 20. The images will be separated by a small distance determined by the paper feeder.