Optical: systems and elements – Lens – With variable magnification
Patent
1997-08-11
1999-05-04
Sugarman, Scott J.
Optical: systems and elements
Lens
With variable magnification
359649, 359663, 359708, G02B 1514, G02B 1318
Patent
active
059009896
ABSTRACT:
Projection lenses for use with pixelized panels, e.g., LCD panels, are provided. The lenses have a large focus range, e.g., a focus range of greater than 0.05 and in many cases greater than 0.1, and a limited (mini) zoom range, e.g., a zoom range of less than 15% (.+-.7.5% from the center of the range). By limiting the zoom range, complex lens structures involving large numbers of lens elements are avoided. In particular, the lenses employ at most one additional lens element and in many cases no additional lens elements compared to non-zooming lenses having a similar focus range.
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The Handbook of Plastic Optics, U.S. Precision Lens, Inc., Cincinnati, Ohio, 1983, pp. 17-29.
Klee Maurice M.
Sugarman Scott J.
U.S. Precision Lens Inc.
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