Zoom lens system which covers a wide angle range

Details Zoom lens system which covers a wide angle range Zoom lens system which covers a wide angle range

2005-04-26

2005-04-26

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000

Reexamination Certificate

active

06885507

ABSTRACT:
A zoom lens system, covering a wide-angle range, includes a negative first lens group, a positive second lens group, and a negative third lens group. Zooming is performed by varying the distances between the first to third lens groups, and the zoom lens system satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?1.9<|(fw*ft)1/2/f1|<2.9(f1<0)  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.0<f12t/f12w<1.8  (2)in-line-formulae description="In-line Formulae" end="tail"?whereinfw and ft designate the focal length of the entire zoom lens system, respectively, at the short focal length extremity and the long focal length extremity;f1designates the focal length of the negative first lens group;f12wand f12tdesignate the combined focal length of the negative first lens group and the positive second lens group, respectively, at the short focal length extremity and the long focal length extremity.

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English Language Abstracts of JP Appl. No. 6-82697.

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