Zoom lens system

Details Zoom lens system Zoom lens system

2005-07-12

2005-07-12

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S682000

Reexamination Certificate

active

06917476

ABSTRACT:
A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group. Upon zooming from the short to long focal length extremities, the distance between the first and second lens groups decreases, and the distance between the second and third lens groups increases. The zoom lens system satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?0.4<(fw·ft)1/2/|f1|<0.8(f1<0)  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.7<(fw·ft)1/2/f2<1.4  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.4<(fw·ft)1/2/f3<0.9  (3)in-line-formulae description="In-line Formulae" end="tail"?whereinfw and ft designate the focal lengths of the entire zoom lens system at the short and long focal length extremities, respectively; andfi designates the focal length of the ith lens group (i=1˜3).

REFERENCES:
patent: 6124984 (2000-09-01), Shibayama et al.
patent: 6515804 (2003-02-01), Watanabe et al.
patent: 6597513 (2003-07-01), Minefuji
patent: 2003/0123156 (2003-07-01), Minefuji
patent: 2003/0210471 (2003-11-01), Mihara et al.
patent: 10170826 (1998-06-01), None
patent: 10213745 (1998-08-01), None
English Language Translation of JP Appln. No. 10-213745.

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