Zoom lens

Details Zoom lens Zoom lens

1997-11-24

2000-02-29

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359683, 359686, 359713, 359714, 359715, 359740, G02B 1514, G02B 302, G02B 900

Patent

active

060316691

ABSTRACT:
A high-performance zoom lens is disclosed having at least four axially movable lens groups for zooming from a wide-angle end to a telephoto end. The zoom lens constitutes a number of lens elements that is no more than twice the number of movable lens groups, thereby facilitating compactness. The movable lens groups include a first, or most objectwise, movable lens group having positive refractive power, and a rear, or most imagewise, movable lens group having negative refractive power. The zoom lens satisfies at least one of four conditions, including:

REFERENCES:
patent: 4063800 (1977-12-01), Iizuka et al.
patent: 4673258 (1987-06-01), Masumoto
patent: 5042927 (1991-08-01), Ogawa et al.
patent: 5126883 (1992-06-01), Sato et al.
patent: 5325233 (1994-06-01), Nakatsuji et al.
patent: 5361167 (1994-11-01), Aoki
patent: 5440430 (1995-08-01), Sato
patent: 5666229 (1997-09-01), Ohtake

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