Small-size zoom lens system

Details Small-size zoom lens system Small-size zoom lens system

1989-08-28

1990-09-11

Arnold, Bruce Y.

G02B 1515, G02B 964

Patent

active

049557009

ABSTRACT:
A small-size zoom lens system includes a first lens group, a second lens group, and a third lens group which are successively arranged from an object side to an image side. The first, second, and third lens groups have negative, positive, and negative focal lengths, respectively. The first, second, and third lens groups are movable toward the object side for zooming movement from a wide angle end toward a telephoto end, while varying the distances between the first, second, and third lens groups. The focal length of the ith lens group (i=1, 2, 3), and the focal length fw of the entire zoom lens system at the wide angle end of zooming movement satisfy the following conditions:

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