Zoom lens system

Details Zoom lens system Zoom lens system

1997-09-23

1999-06-15

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359687, 359686, G02B 1514

Patent

active

059127716

ABSTRACT:
A zoom lens system includes a positive first lens group, a negative second lens group, and a positive third lens group. The second and third lens groups move to perform a zooming operation. The zoom lens system satisfies the relationships 0<logZ.sub.2 /logZ<0.4; 0.25<d.sub.1-2 /f.sub.W <0.55; and 3<L.sub.2-3 /f.sub.W <4.6, wherein "Z.sub.2 " designates the ratio defined by the lateral magnification of the second lens group at the longest focal length extremity to the lateral magnification of the second lens group at the shortest focal length extremity, "Z" represents the ratio defined by the longest focal length of the entire zoom lens system to the shortest focal length of the entire zoom lens system, "f.sub.W " represents the shortest focal length of the entire zoom lens system, "d.sub.1-2 " represents the distance between the last lens surface of the first lens group and the first lens surface of the second lens group at the shortest focal length extremity, and "L.sub.2-3 " represents the distance between the principal points of the second and third lens groups at the shortest focal length extremity.

REFERENCES:
patent: 4345821 (1982-08-01), Tachihara
patent: 5543969 (1996-08-01), Ito

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