Zoom lens system

Details Zoom lens system Zoom lens system

1995-09-06

1997-09-02

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359689, 359714, G02B 1514, G02B 1318

Patent

active

056638388

ABSTRACT:
A zoom lens system which includes a positive first lens group and a negative second lens group, arranged in this order from an object side so that a distance between the first and second lens groups is changed to alter the focal length. The first lens group includes a first negative sub-lens group, and a first positive sub-lens group. The first negative sub-lens group includes a first negative lens made of glass, and a second negative lens made of plastic. The first positive sub-lens group includes a positive third lens made of glass. The negative second lens group includes a positive fourth lens made of plastic, and a negative fifth lens made of glass lens, in this order from the object side. The zoom lens system satisfies the following relationships:

REFERENCES:
patent: 5162947 (1992-11-01), Ito
patent: 5260833 (1993-11-01), Ito et al.
patent: 5272564 (1993-12-01), Suzuki et al.
patent: 5278699 (1994-01-01), Ito et al.
patent: 5309285 (1994-05-01), Ito
patent: 5386321 (1995-01-01), Kawamura
patent: 5424871 (1995-06-01), Ito et al.
patent: 5434712 (1995-07-01), Ito
patent: 5493448 (1996-02-01), Betensky et al.
Hecht, Eugene, Hecht Optics, Second Edition 1987 p. 235.

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