MAGNIFICATION CHANGE WITH A CATADIOPTRIC LENS
Original Publication Date: 1981-Jun-30
Included in the Prior Art Database: 2004-Apr-02
Xerox Disclosure Journal
It is known to use a catadioptric lens and a system of three moving mirrors to image the platen of a xerographic copier onto a moving photoreceptor surface at unit magnification. By using a catadioptric lens 3,4, as shown in the Figure and a system of five moving mirrors 5,6,7,8,9, it is possible to create either a unit magnification or a reduced image of a document on platen 1 on moving photo-receptor without changing the velocity of the photoreceptor. For operation at unit magnification, mirrors 5,6,7,8,9 move from the initial positions shown in solid lines to positions 5',6',7',8',9' shown in dotted lines. To operate in a reduction mode, the initial positions of the moving mirrors are shifted from 5,6,7,8,9 to 5,6A,7A,8A,9, respectively. The mirrors move from this initial configuration to the final configuration 5',6A,7A,8A1,9' during the reduction-mode scan. The set of mirrors 8,9 have been added to the system in order to create the reduction system and produce the necessary precession upon the photoreceptor surf ace.