RIS WITH MULTIPLE RESOLUTIONS
Original Publication Date: 1988-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
Figure 1 shows an imaging system in which a document 10 on a platen 12 is incrementally scanned and an image projected through a gradient index lens array 14 onto a CCD sensor array 16 having a nominal resolution of 250 spi. In Figure 1, array 14 is a multi-magnification lens at a position to provide a 1.2 enlargement of the image. This configuration creates the effect of a high resolution (300 spi) at the document. Figure 2 shows the lens array 14 in a .834 reduction position resulting in an apparent resolution of 208 spi at the document. Thus, array 16 can accommodate two functions with the embodiments shown. The concept is expandable to four or more resolutions by combining additional lens arrays into a multiple lens array assembly. The assembly can be translated laterally and rotated to bring the desired array into the optical imaging path.