Zoom lens system

Details Zoom lens system Zoom lens system

1992-07-02

1994-01-11

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

052786994

ABSTRACT:
A zoom lens system for a compact camera, having a zoom ratio of approximately 2 or 3 and a smaller overall lens length at the telephoto end than the focal distance at the telephoto end, and which optically experiences only a small focus shift due to environmental changes such as temperature or humidity. The zoom lens system includes a positive lens group and a negative lens group. A positive plastic lens element is disposed in either the positive lens group or the negative lens group. The magnification of the system is adjusted by varying the distance between the positive and negative lens groups. The zoom lens system satisfies the following conditions:

REFERENCES:
patent: 5082360 (1992-01-01), Sato et al.
patent: 5109299 (1992-04-01), Kato
patent: 5164859 (1992-11-01), Ito
patent: 5168403 (1992-12-01), Umada et al.

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