Optical: systems and elements – Lens – With variable magnification
Patent
1992-08-31
1994-05-17
Sugarman, Scott J.
Optical: systems and elements
Lens
With variable magnification
359739, 359740, G02B 1514
Patent
active
053133307
ABSTRACT:
Zoom projection lens systems are provided which have 1) an entrance pupil which remains at a substantially fixed position as zooming takes place, and 2) a operative aperture stop, distinct from the system's physical aperture stop, which moves through lens surfaces as zooming takes place. The fixed entrance pupil allows for efficient coupling to a light source throughout the magnification range of the system. Methods which can be used to design and produce zoom lens systems of this type and which employ a pseudo-aperture stop are also disclosed.
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I. A. Neil, "Use of Chalcogenide Glass in Thermal Infrared Telescopes," 1980 International Lens Design Conference (OSA), SPIE, vol. 237, p. 429.
Klee Maurice M.
Sugarman Scott J.
U.S. Precision Lens Incorporated
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