Optical: systems and elements – Having significant infrared or ultraviolet property – Including continuously variable magnification or focal length
Patent
1991-05-02
1992-09-29
Arnold, Bruce Y.
Optical: systems and elements
Having significant infrared or ultraviolet property
Including continuously variable magnification or focal length
359356, 359357, 359676, 359679, G02B 1500
Patent
active
051518201
ABSTRACT:
A zoom lens, for use in a telescope at infra-red wavelengths or single wavelength visible light, provides a magnification which may be adjusted to either of two predetermined values. The lens comprises a pair (14) of similar elements (15, 16) fixed relative to one another and each having an aspheric convex surface with the aspheric surfaces of the pair of elements outermost. The pair of elements (14) is located between the two image planes formed in the telescope and is movable between two conjugate positions.
REFERENCES:
patent: 3890036 (1975-06-01), Grey
patent: 4148548 (1979-04-01), Thompson
patent: 4494819 (1985-01-01), Lidwell
Lessels Alison B.
Sillitto Hilary G.
Arnold Bruce Y.
GEC Ferranti Defence Systems Limited
Ryan J. P.
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