Zoom lens system

Details Zoom lens system Zoom lens system

1997-10-30

1999-06-22

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359689, G02B 1514

Patent

active

059148209

ABSTRACT:
A Zoom lens system, from the enlargement side, has the first to fourth lens units having the negative, positive, negative, positive optical power, respectively. The third lens unit has a meniscus lens having a convex surface on the enlargement side. The fourth lens unit has two positive lenses. During zooming from the shortest focal length condition to the longest focal length condition, the second and third lens units move along the optical axis so that a distance between the second and third lens units increases and a distance between the third and fourth lens units decreases. The zoom lens system fulfills the following conditions:

REFERENCES:
patent: 4687302 (1987-08-01), Ikemori et al.
patent: 4824223 (1989-04-01), Docter et al.
patent: 5009491 (1991-04-01), Hata
patent: 5132848 (1992-07-01), Nishio et al.

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