Compact camera zoom lens system

Details Compact camera zoom lens system Compact camera zoom lens system

1997-11-14

1999-09-21

Dang, Hung Xuan

Optical: systems and elements

Lens

With variable magnification

359676, G02B 1514

Patent

active

059561858

ABSTRACT:
The invention comprises a fast zoom lens system comprising, from an object side to an image side, three lens groups. The first lens group has an overall positive refractive power, the second lens group has an overall positive refractive power, and the third lens group has an overall negative refractive power. The first lens group, the second lens group and the third lens group move toward the object side during operation. In addition, a distance between the first lens group and the second lens group increases while a distance between the second lens group and the third lens group decreases when zooming from a wide-angle position to a telephoto position. Fast zoom lens systems consistent with the invention satisfy the following conditions:

REFERENCES:
patent: 4854682 (1989-08-01), Yamanashi
patent: 4978204 (1990-12-01), Ito
patent: 5148321 (1992-09-01), Goto et al.

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