Optical: systems and elements – Lens – With field curvature shaping
Patent
1998-02-12
1999-05-04
Sugarman, Scott J.
Optical: systems and elements
Lens
With field curvature shaping
359689, 359691, G02B 1514
Patent
active
059009870
ABSTRACT:
A zoom projection lens for use with LCD or DMD panels is provided. The lens has two units U1 and U2, which are moved relative to one another for zooming. The first unit has a negative power and includes at least three lens elements L1, L2, and L3, where L1 is composed of plastic and has two aspherical surfaces, L2 has a positive power and is composed of a flint material, and L3 has a negative power and is composed of a crown material. The second unit has two subunits U2.sub.S1 and U2.sub.S2, each of which has a positive power, with the power of U2.sub.S2 being greater than the power of U2.sub.S1. At its minimum effective focal length f.sub.min, the projection lens has a back focal length to focal length ratio greater than one, the ratio being achieved by arranging the first unit, the second unit, and the subunits of the second unit so that:
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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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