High-magnification zoom lens system

Details High-magnification zoom lens system High-magnification zoom lens system

1993-08-12

1996-06-18

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359708, 359713, G02B 1514, G02B 1318

Patent

active

055284299

ABSTRACT:
A zoom lens system has, from the object side to the image side, a first lens unit of positive power, a second lens unit of positive power and a third lens unit of negative power. Each lens unit has two lens elements. The air space between the first and second lens units and the air space between the second and third lens units are varied during a zooming operation. The zoom lens system fulfills the following condition: ##EQU1## Here, f1 is a focal length of the first lens unit and fW is a focal length of the entire lens system at the shortest focal length condition.

REFERENCES:
patent: 4978204 (1990-12-01), Ito
patent: 4983027 (1991-01-01), Kojima et al.
patent: 5033832 (1991-07-01), Ito
patent: 5069536 (1991-12-01), Ogata
patent: 5196962 (1993-03-01), Aoki
patent: 5260833 (1993-11-01), Ito et al.
patent: 5343329 (1994-08-01), Ito
patent: 5424871 (1995-06-01), Ito et al.

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