Zoom lens system

Details Zoom lens system Zoom lens system

1993-01-28

1993-12-07

Lerner, Martin

Optical: systems and elements

Lens

With variable magnification

359716, G02B 1514

Patent

active

052687937

ABSTRACT:
A variable lens system has three lens unit whose refractive powers are positive, negative and positive from an object side to the image side. Each lens unit consists of at least two lens elements. The central lens unit and the image side lens unit are shifted along an optical axis during a zooming operation. The lens system fulfills the conditions: ##EQU1## wherein fS, Z, and Y' represent the shortest focal length, a zoom ratio and an image height, respectively, of the lens system. .phi.1 and .phi.2 represent refractive powers of the object side and central lens units.

REFERENCES:
patent: 4781447 (1988-11-01), Ozawa
patent: 4925280 (1990-05-01), Hashimoto
patent: 4984876 (1991-01-01), Hata
patent: 4991942 (1991-02-01), Fujibayashi
patent: 4991943 (1991-02-01), Betensky
patent: 4995707 (1991-02-01), Hashimoto
patent: 5103343 (1992-04-01), Sekita

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