Optical: systems and elements – Diffraction
Patent
1991-12-20
1993-12-07
Arnold, Bruce Y.
Optical: systems and elements
Diffraction
359565, 359677, 359684, 359687, 359690, 359742, G02B 518, G02B 1514
Patent
active
052687902
ABSTRACT:
A zoom lens (10) has a first lens group (12), a second lens group (14) and a third lens group (16). The first lens group relays an outside scene to an intermediate plane. The second lens group varies magnification of the relayed image from the first lens group. Also, the second lens group includes at least one diffractive optical element. The third lens group compensates for focus shift and focuses the wavefront onto the viewing plane.
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Nakajima, "Aspheric Zoom Lens", Patent Abstracts of Japan; vol. 9, No. 281 (P-403) (2004) 8 Nov. 1985.
Noboru; "Method and Device for Flow Speed Distribution and Flowamount Measurement by Multicarrier System Laser Doppler Method"; Patent Abstracts of Japan; vol. 4, No. 146 (P-31) 15 Oct. 1980.
Stone et al; "Hybrid Diffractive-Refractive Lenses and Achromats"; Applied Optics/vol. 27, No. 14/15 Jul. 1988; pp. 2960-2971.
Arnold Bruce Y.
Denson-Low Wanda K.
Hughes Aircraft Company
Sales Michael W.
Shafer R. D.
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