Zoom lens system

Details Zoom lens system Zoom lens system

2007-10-02

2007-10-02

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

11516712

ABSTRACT:
Providing a zoom lens system that has a high zoom ratio, high optical performance, and compactness, and is easy to be manufactured. The zoom lens system includes, in order from an object, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a fourth lens group having positive refractive power. Zooming from a wide-angle end state to a telephoto end state is carried out by moving each lens group along the optical axis such that a distance between the first lens group and the second lens group increases, a distance between the second lens group and the third lens group decreases, a distance between the third lens group and the fourth lens group decreases. A zoom ratio is 5.0 or more. Given conditional expressions are satisfied.

REFERENCES:
patent: 5557470 (1996-09-01), Shibayama
patent: 5699198 (1997-12-01), Inadome et al.
patent: 6621643 (2003-09-01), Sato
patent: 6791762 (2004-09-01), Yamada
patent: 8-248319 (1996-09-01), None
patent: 11-352400 (1999-12-01), None
patent: 2002-323655 (2002-11-01), None

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