Zoom lens system

Details Zoom lens system Zoom lens system

1992-10-21

1994-09-13

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359686, 359687, G02B 1514

Patent

active

053473990

ABSTRACT:
A zoom lens system is disclosed which is fairly compact and easy to handle despite the fact that it has a constant overall lens length and which allows the first lens group to be moved by a sufficiently small amount during zooming to facilitate the adoption of automatic housing. The zoom lens system includes, in order from the object side, a first lens group having a positive power, a second lens group having a negative power and a third lens group having a positive power, the first lens group being fixed during zooming, the second and third lens groups being moved along the optical axis as zooming is effected, the system satisfying the following conditions (a) and (b):

REFERENCES:
patent: 4350416 (1982-09-01), Ishiyama
patent: 4462664 (1984-07-01), Moskovich
patent: 4693566 (1987-09-01), Imaizumi
patent: 4925280 (1990-05-01), Hashimoto
patent: 4984876 (1991-01-01), Hata et al.
patent: 4991942 (1991-02-01), Fujibayashi et al.

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