MULTI-RATE SCAN AND PRECESSION SYSTEM
Original Publication Date: 1985-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
Figures 1 and 2 show a variable conjugate screening system which incorporates a short focal length linear lens to project an image onto a photoreceptor surface. Figure 1 shows the start of scan position; Figure 2 the end of scan. As shown, a document 10, placed on platen 12, is illuminated by an elondated light source 14 moving in conjunction with a full rate scanning rnirror 16. The image is reflected onto 1/2 rate corner mirror assembly 18 and projected through a multiple lens linear array 20. Array 20 consists of lens strip 22 which forms an intermittent image at lens strip 24, the image being re-projected throudh lens strip 26. The relative direction of scan becornes reversed as a result of the re-projection. The image is then reflected from corner rnirror 28 and mirror 30 onto the surface of belt 32. The tnirrors 28,30 are rnoved at a variable rate and serve to precess the image onto the belt surface. Because of the reversal of the scan direction achieved by lens array 24, the precessor scan is in the same direction as the belt movement. Figure 2 also shows, in dotted form, the fixed position of mirrors 2a, 30 when operating in a non-precession mode.