Zoom lens system

Details Zoom lens system Zoom lens system

1997-11-25

1999-10-26

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

059738545

ABSTRACT:
A zoom lens system has first to fifth lens units from the object side. The second lens unit has a negative optical power. The other lens units have each a positive optical power. During zooming, the first, third and fourth lens units move along the optical axis to vary the distances between the lens units. The zoom lens system fulfills the conditions 0.01.ltoreq..vertline.f2/fT.vertline..ltoreq.0.20 and 25.ltoreq.(fT/f34W).times.Z.ltoreq.300, where f2 represents the focal length of the second lens unit, fT represents the focal length of the entire zoom lens system at the longest focal length condition, f34W represents the composite focal length of the third and fourth lens units at the shortest focal length condition, and Z represents the zoom ratio.

REFERENCES:
patent: 5050972 (1991-09-01), Mukaiya et al.
patent: 5414562 (1995-05-01), Ueda
patent: 5537255 (1996-07-01), Tochigi
patent: 5548445 (1996-08-01), Yahagi
patent: 5583701 (1996-12-01), Yamanashi
patent: 5610766 (1997-03-01), Aoki et al.

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