Fast zoom lens system

Details Fast zoom lens system Fast zoom lens system

2007-11-27

2007-11-27

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S715000, C359S740000, C359S774000

Reexamination Certificate

active

11556740

ABSTRACT:
A fast zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group and a positive fourth lens group, in this order from the object.Upon zooming from the short focal length extremity to the long focal length extremity, a distance between the positive first lens group and the negative second lens group increases, a distance between the negative second lens group and the positive third lens group decreases, and a distance between the positive third lens group and the positive fourth lens group decreases.The fast zoom lens system satisfies the following conditions;in-line-formulae description="In-line Formulae" end="lead"?6.0<f1/fw<10.0  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?3.0<f3/fw<8.0  (2)in-line-formulae description="In-line Formulae" end="tail"?whereinf1designates the focal length of the positive first lens group;f3designates the focal length of the positive third lens group; andfw designates the focal length of the entire fast zoom lens system at the short focal length extremity.

REFERENCES:
patent: 6519094 (2003-02-01), Boku et al.
patent: 2004/0125462 (2004-07-01), Misaka
patent: 2005/0013015 (2005-01-01), Sensui
patent: 2006/0061873 (2006-03-01), Saori
patent: 2006/0139768 (2006-06-01), Saori
patent: 2007/0002456 (2007-01-01), Saori
patent: 2003-84198 (2003-03-01), None
patent: 2004-101739 (2004-04-01), None
patent: 2004-198529 (2004-07-01), None
patent: 2005-49843 (2005-02-01), None
patent: 2005-181556 (2005-07-01), None
U.S. Appl. No. 11/550,118 to Saori, which was filed on Oct. 17, 2006.
U.S. Appl. No. 11/565,735 to Saori, which was filed on Dec. 1, 2006.
English language abstract of JP 2003-84198.
English language abstract of JP 2004-101739.
English language abstract of JP 2005-181556.

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