Zoom lens system

Details Zoom lens system Zoom lens system

1997-11-26

2000-07-25

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359691, G02B 1514

Patent

active

060943149

ABSTRACT:
The invention provides a zoom lens system which, albeit comprising an extremely reduced number of lenses, is well corrected for various aberrations. The zoom lens system comprises at least a negative lens group G1 and a first positive lens group G2. A second positive lens group G3 is located between the first positive lens group G1 and an image side of the system, said group G3 including at least one surface having diffractive action substantially rotationally symmetric with respect to an optical axis of the system. For zooming, at least a spacing between the negative lens group G1 and the first positive lens group G2 is changed. The system further satisfies a specific condition for making correction for longitudinal chromatic aberration, and a specific condition for making correction for chromatic aberration of magnification.

REFERENCES:
patent: 5268790 (1993-12-01), Chen
patent: 5731914 (1998-03-01), Meyers
patent: 5745301 (1998-04-01), Betensky et al.
patent: 5768030 (1998-06-01), Estelle
patent: 5796514 (1998-08-01), Chipper
patent: 5875059 (1999-02-01), Estelle
Toshiro et al., "Zoom Lens", Patent Abstracts of Japan, 06011650, Jan. 1994.
Inanobe et al., "Variable Power Lens", Patent Abstracts of Japan, 2-56515, Feb. 1990.
Swanson, "Binary Optics Technology", Lincoln Laboratory, .M41, .L741, No. 914, pp. iii-27, Mar. 1991.

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