Zoom lens system

Details Zoom lens system Zoom lens system

1993-08-27

1995-10-03

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359713, G02B 1514, G02B 1318

Patent

active

054557143

ABSTRACT:
A zoom lens system comprises from the object side to the image side a negative first lens unit, a positive second lens unit, and a negative third lens unit. The negative first lens unit consists of a negative lens element and a positive lens element. The positive second lens unit consists of a negative lens element and a positive lens element, and has a first air space between the first and second lens units. The negative third lens unit consists of a positive lens element and a negative lens element, and has a second air space between the second and third lens units. All the lens units shift along an optical axis of the zoom lens system during a zooming operation from the shortest focal length condition to the longest focal length condition with decreasing the first and second air spaces.

REFERENCES:
patent: 3286592 (1966-11-01), Wagner et al.
patent: 4909613 (1990-03-01), Kikichi
patent: 4936661 (1990-06-01), Betensky et al.
patent: 4938572 (1990-07-01), Iwasaki
patent: 4955700 (1990-09-01), Yamaguchi
patent: 5175648 (1992-12-01), Mori
patent: 5253114 (1993-10-01), Lee et al.

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