Imaging system for a multi-magnification copier utilizing gradient index lens array

An imaging system for a multi-magnification copier wherein a document on an object plane is reproduced onto a photosensitive image plane at a selected magnification, said system including:

• a lens array assembly comprising a first gradient index lens array positioned between the object and image planes, to transmit an image of said document onto said image plane first at a unity magnification,
• a second gradient index lens array positioned between the object and image planes, said lens array adapted to transmit an image of said document onto said image plane at a second magnification m other than unity, said system further including:
• means for preventing transmission of said document image through a selected one of said lens arrays whereby light reflected from said document is transmitted through said other array in the particular magnification onto the image plane,
• illumination means placed beneath the object plane and adapted to provide a narrow illumination band of light along the bottom surface of the object plane so as to create a document scan exposure zone,
• means for driving said document past said exposure zone, said driving means adapted to move the platen at a first rate associated with said unity magnification, a second rate associated with said second magnification and at least a third rate at one of said magnifications, said third rate resulting in an anamorphic magnification K of said document image at said imaging plane in the scan direction, and
• means for moving the image plane at a process speed V.