Zoom lens system

Details Zoom lens system Zoom lens system

2007-07-31

2007-07-31

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S687000

Reexamination Certificate

active

11237668

ABSTRACT:
Providing a zoom lens system having a high zoom ratio, a small diameter of the first lens group, capable of being effectively retracted upon retracting the lens barrel. The 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, a fourth lens group having positive refractive power, and a fifth lens group having positive refractive power. When zooming from a wide-angle end state to a telephoto end state, the first, second, third, and fourth lens groups move along an optical axis and the second lens group moves along a zoom trajectory being concave to the object. The fourth lens group is composed of a front lens group having positive power and a rear lens group having negative power with a space in between. Given conditional expressions are satisfied.

REFERENCES:
patent: 5583701 (1996-12-01), Yamanashi
patent: 5610766 (1997-03-01), Aoki et al.
patent: 5668666 (1997-09-01), Suzuki
patent: 6721105 (2004-04-01), Ohtake et al.
patent: 6-281862 (1994-10-01), None
patent: 2003-177318 (2003-06-01), None

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