Zoom lens system with a high zoom ratio

Details Zoom lens system with a high zoom ratio Zoom lens system with a high zoom ratio

1998-08-13

2000-05-09

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

060611871

ABSTRACT:
A zoom lens system includes, when viewed from an object side, a first lens group with a positive refractive power; a second lens group with a positive refractive power; and a third lens group with a negative refractive power. When zooming from a wide-angle position to a telephoto position, the first, second and third lens groups move towards the object side while the distance between the first lens group and the second lens group increases and the distance between the second lens group and the third lens group decreases. The zoom lens system is compact and has a high zoom ratio of more than 3.5.

REFERENCES:
patent: 4983027 (1991-01-01), Kojima et al.
patent: 5633759 (1997-05-01), Nagata et al.
patent: 5777799 (1998-07-01), Miyauchi
patent: 5781348 (1998-07-01), Ohtake
patent: 5793535 (1998-08-01), Ito et al.

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