Zoom lens system with small numbers of lenses and wide viewing a

Details Zoom lens system with small numbers of lenses and wide viewing a Zoom lens system with small numbers of lenses and wide viewing a

1993-04-01

1997-03-11

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359689, G02B 1514

Patent

active

056107676

ABSTRACT:
A zoom lens system comprising, in order from the object side, a positive first lens group and a negative second lens group, with the focal length being changed by varying the distance between the first and second lens groups, which lens system is characterized in that said first lens group comprises, in order from the object side, a negative sub-group 1a and a positive sub-group 1b, said sub-group 1a comprising, in order from the object side, a negative first lens element having its smaller radius of curvature on the surface directed towards the object and a positive second lens element having a convex surface directed towards the image plane. The lens system satisfies a number of predetermined conditions.

REFERENCES:
patent: 4936661 (1990-06-01), Betensky et al.
patent: 5162947 (1992-11-01), Ito

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