Zoom lens system

Details Zoom lens system Zoom lens system

2006-08-28

2008-12-02

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000

Reexamination Certificate

active

07460312

ABSTRACT:
A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group functioning as a focusing lens group, in this order from the object.Upon zooming from the short focal length extremity to the long focal length extremity, the distance between the negative first lens group and the positive second lens group decreases, and the distance between the positive second lens group and the positive third lens group increases.The positive third lens group includes cemented lens elements having a positive lens element and a negative lens element.The zoom lens system satisfies the following condition:in-line-formulae description="In-line Formulae" end="lead"?0.2<f3−p/|f3−n|<0.35  (1)in-line-formulae description="In-line Formulae" end="tail"?whereinf3−pdesignates the focal length of the positive lens element of the positive third lens group; andf3−ndesignates the focal length of the negative lens element of the positive third lens group.

REFERENCES:
patent: 6308011 (2001-10-01), Wachi et al.
patent: 6757108 (2004-06-01), Sensui et al.
patent: 6844986 (2005-01-01), Nanba
patent: 6925253 (2005-08-01), Miyatake
patent: 2006/0221463 (2006-10-01), Enomoto
patent: 2000-111798 (2000-04-01), None
patent: 2002-139671 (2002-05-01), None
patent: 2003-131133 (2003-05-01), None
English Language Abstract of JP 2000-111798.
English Language Abstract of JP 2002-139671.
English Language Abstract of JP 2003-131133.

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