Compact zoom lens

Details Compact zoom lens Compact zoom lens

2011-05-10

2011-05-10

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000, C359S680000

Reexamination Certificate

active

07940474

ABSTRACT:
A three-lens group zoom lens in an N-P-P configuration; the first, second, and third lens groups are arranged sequentially from an object side to an image side; during zooming from a wide-angle to a telephoto position the distance between the first lens group and the second lens group is reduced and the distance between the second lens group and the third lens group is changed, and the zoom lens satisfies the following inequalitiesin-line-formulae description="In-line Formulae" end="lead"?−1.3<f1/f2<−1.0in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.6<f2/fw<2.3in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?4.5<f3/fw<5.2,in-line-formulae description="In-line Formulae" end="tail"?where, f1, f2, and f3, respectively, denote the focal lengths of the first, second and third lens groups, and fwdenotes the focal length of the overall zoom lens at the wide-angle position.

REFERENCES:
patent: 7289275 (2007-10-01), Ito
patent: 2008/0180810 (2008-07-01), Ito
patent: 2008/0304163 (2008-12-01), Katakura
patent: 2005-084597 (2005-03-01), None
patent: 2006-011096 (2006-01-01), None
patent: 2007-272216 (2007-10-01), None

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