Zoom lens system

Details Zoom lens system Zoom lens system

2006-11-28

2006-11-28

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07142372

ABSTRACT:
A zoom lens system includes a negative first lens group which is stationary or movable, a positive second lens group which is movable, and a positive third lens group which is movable, in this order from the object.Upon zooming from the short focal length extremity to the long focal length extremity, a distance between the negative first lens group and the positive second lens group decreases, and a distance between the positive second lens group and the positive third lens group increases.The zoom lens system satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?0.3<fw/|f1|<0.65(f1<0)  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.6<fw/f2<1.2  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.3<fw/f3<0.6  (3)in-line-formulae description="In-line Formulae" end="tail"?whereinfw designates the focal length of the entire zoom lens system at the short focal length extremity; andfidesignates the focal length of the ithlens group (i=1, 2, 3).

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U.S. Appl. No. 10/929,364 to Saori, filed Aug. 31, 2004.
U.S. Appl. No. 10/940,704, to Eguchi, filed Sep. 15, 2004.

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