ELECTRONIC SCANNER FOR COPIER EXPOSURE STATION
Original Publication Date: 1979-Aug-31
Included in the Prior Art Database: 2004-Apr-02
Xerox Disclosure Journal
The figures show a copier exposure system which provides the equivalent of slit scanning optics without the mechanical components usually required. As shown, two banks of exposure lamps 20, 20 are aligned in the scan direction on each side of a document platen 40. Reflectors 50, 50 partially surround the lamps to reflect the light and direct it to the platen surface, Lens 60 projects the scanner image on a suitable imaging plane. When a copy cycle is initiated, the first three lamp pairs (1, 2, 3 in the figure) are turned on providing illumination across a corresponding band or scan length of the platen. As the exposure cycle continues, lamp pair //1 shuts off and lamp pair //4 turns on. This progression of lamp switching, continued through lamp pair //14, follows the scan at the required scan speed until the entire area between the lamps is scanned. The scanning is thus accomplished electronically so that the speed can easily be varied in the case of a change of magnification.