Zoom lens system

Details Zoom lens system Zoom lens system

2005-06-14

2005-06-14

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S682000

Reexamination Certificate

active

06906868

ABSTRACT:
A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group. The negative first lens group includes a negative meniscus lens element having the convex surface facing toward the object, and the positive third lens group includes a positive biconvex lens element. Upon zooming, at least the negative first lens group and the positive second lens group are moved. A diaphragm is provided on the object side of the positive second lens group, and moves integrally therewith. The zoom lens system satisfies the following conditions: 0.25<R1/D1<0.55 . . . (1); 0.25<f2/TL<0.45 . . . (2) wherein R1: the radius of curvature of the image-side surface of the negative meniscus lens element; D1: the distance between the negative first lens group and the positive second lens group at the short focal length extremity; f2: the focal length of the positive second lens group; and TL: the distance from the most object-side surface the negative first lens group to the most image-side surface of the positive third lens group, at the short focal length extremity.

REFERENCES:
patent: 6377404 (2002-04-01), Goosey, Jr.
patent: 2003/0072085 (2003-04-01), Mizuguchi et al.
patent: 10206732 (1998-08-01), None
patent: 11211984 (1999-08-01), None
English Language Translation of JP Appln. No. 10-206732.
English Language Translation of JP Appln. No. 11-211984.

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