Optical: systems and elements – Having significant infrared or ultraviolet property – Including continuously variable magnification or focal length
Patent
1994-01-13
1996-02-20
Dzierzynski, Paul M.
Optical: systems and elements
Having significant infrared or ultraviolet property
Including continuously variable magnification or focal length
359357, 359565, G02B 1514, G02B 1314, G02B 2744
Patent
active
054934419
ABSTRACT:
An infrared continuous zoom telescope or afocal lens system using a diffractive surface for color correction. The lens system comprises an objective lens, an eyepiece lens, a plurality of lenses disposed between the objective lens and the eyepiece lens to provide the zoom function and a diffractive pattern disposed at a surface, preferably the interior surface and preferably integral therewith, of the objective lens to provide color correction at a predetermined wavelength of light passing through the objective lens. All of the lenses are preferably germanium. The diffractive pattern comprises a plurality of spaced ring-shaped steps, each ring concentric with the center of the objective lens and each step having a height equal to the predetermined wavelength for which the lens system is designed. The plurality of ring-shaped steps are formed in accordance with a known formula.
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"Diffractive Optical Elements For Use In Infrared Systems" Swanson et al., Optical Engineering vol. 28. No. 6, Jun., 1989, pp. 605-608.
Chiang Audrey
Donaldson Richard L.
Dzierzynski Paul M.
Grossman Rene E.
Texas Instruments Incorporated
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