Optical: systems and elements – Diffraction – From zone plate
Patent
1998-07-02
1999-11-09
Henry, Jon
Optical: systems and elements
Diffraction
From zone plate
359570, 359743, 359689, G02B 2744, G02B 518, G02B 308, G02B 1514
Patent
active
059825448
ABSTRACT:
The invention provides a compact yet high-zoom-ratio zoom lens system for use with lens shutter cameras, which is well corrected for aberrations albeit being made up of a small number of lenses. The zoom lens comprises a first lens group G1 of positive refracting power, a second lens group G2 of positive refractive power and a third lens group G3 of negative refracting power. The lens groups move for zooming from the wide angle side to the telephoto side, with a separation between the first and second lens groups becoming wide and a separation between the second and third lens groups becoming narrow. At least one lens group has a diffractive surface therein, and satisfies 1.8<.beta..sub.T /.beta..sub.W <4.0 where .beta..sub.T and .beta..sub.W are transverse magnifications of the lens group having a diffractive surface at the wide-angle end and the telephoto end of the lens system.
REFERENCES:
patent: 5148314 (1992-09-01), Chen
patent: 5268790 (1993-12-01), Chen
patent: 5543966 (1996-08-01), Meyers
Thomas Stone, et al., "Hybrid diffractive-refractive lenses and achromats", Applied Optics, Jul. 15, 1998, vol. 27, No. 14, pp. 2960-2971.
Mark M. Meyers, "Diffractive optics at Eastman Kodak Company", SPIE, (1996), vol. 2689, pp. 228-254.
Henry Jon
Olympus Optical Co,. Ltd.
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