Photocopying – Projection printing and copying cameras – Distortion introducing or rectifying
Patent
1994-05-05
1995-07-25
Gellner, Michael L.
Photocopying
Projection printing and copying cameras
Distortion introducing or rectifying
355238, G03B 2768
Patent
active
054366917
ABSTRACT:
A copier with an anamorphic magnification imaging system is provided with improvements which enable increased resolution of exposed line images at a photoreceptor. The improvement relates to reducing the effective imaging aperture through which the images is projected onto the surface of a photoreceptor. In one embodiment, a gradient index lens array which transmits light reflected from illuminated scan strip on a document platen is provided with two blockers attached to opposite sides of the lens array. Each blocker element has a blocking end which projects into the optical path and blocks a portion of the light that would otherwise be transmitted along the optical path. The effect of the two blockers is to form an effective imaging aperture having a width less than 1mm, in the preferred embodiment about 0.4mm. This narrow imaging width enables a high resolution output image. Increased illumination requirements are met, in another embodiment, by using a faster lens to increase exposure and modifying the lens by adding an extra pitch to increase the total conjugate which would otherwise limited by using the faster lens.
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William Lama, "Optical Properties of GRIN fiber lens arrays: dependence on fiber length," Applied Optics, vol. 21, No. 15, Aug. 1, 1982.
James D. Rees, "Office applications of gradient-index optics," SPIE vol. 935 Gradient-Index Optics and Miniature Optics (1988).
James D. Rees, "Method to Lengthen the Total Conjugate of Fast Gradient Index Arrays," Xerox Disclosure Journal, vol. 12, No. 3, May/Jun. 1987.
Bell Conrad J.
Rees James D.
Gellner Michael L.
Malley D. P.
Xerox Corporation
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