Abstract: A multi-magnification, short focal length imaging system is enabled by providing a lens assembly having a plurality of short focal length lens arrays formed within a unitary plastic or glass body. The lens arrays are composed of a plurality of lenslets formed by either a masking/radiation heat treating process when using a photosensitive glass or by plastic injection molding techniques. The lenslets are formed with the appropriate spacing parameters and lens axis tilt orientation to enable projection of a reduced or enlarged image of a document at an image plane. The lens assembly is translated and/or rotated in response to magnification reproduction values selected by an operator so as to place the appropriate lens array into an optical projection path.

Abstract: A three-dimensional, relative illumination corrector is positioned in a document imaging system so as to compensate for the cos 4 illumination falloff effect at the center field angles. The corrector is positioned at either the image or the object side of the system projection lens. In a first embodiment, the corrector is a generally conical, solid body. In a second embodiment, the corrector interior is hollow to permit a higher level of on-axis illumination.

Abstract: A reduction/enlargement gradient index lens array is provided which comprises several groups of square-ended fibers, the fibers within a particular group being of the same length. Group fiber length decreases generally from center to the ends of the array. The group are assembled in a characteristic fan-like fashion to form a reduction/enlargement lens array.