Zoom lens system

Details Zoom lens system Zoom lens system

Filed on

1997-10-07

Date issued

1999-08-03

Examiner

Epps, Georgia

Patent Class

Optical: systems and elements

SubClass

Lens

SubSubClass

With variable magnification

Other Related Categories

359683, G02B 1514

Type

Patent

Status

active

Patent number

059332816

Description

ABSTRACT:
A zoom lens system is provided having a first lens group with a positive refractive power; a second lens group with a negative refractive power; a third lens group with a positive refractive power; a fourth lens group with a negative refractive power; and a fifth lens group with a positive refractive power. The focal length at the wide-angle end is shorter than the diagonal line of the field of view. The fifth lens group is moved toward the object end of the system and the lens separation of each of the lens groups is changed for zooming from the wide-angle end to the telephoto end. At the same time, the system fulfills the following conditions:

REFERENCES:
patent: 4437732 (1984-03-01), Ishiyama
patent: 4636040 (1987-01-01), Tokumaru
patent: 5189557 (1993-02-01), Endo
patent: 5528427 (1996-06-01), Tanaka et al.
patent: 5585969 (1996-12-01), Endo

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