Zoom lens system

Details Zoom lens system Zoom lens system

2007-02-13

2007-02-13

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000

Reexamination Certificate

active

11242946

ABSTRACT:
A zoom lens system includes a negative first lens group and a positive second lens group.The negative first lens group includes a negative lens element and a positive lens element.The positive second lens group includes a positive lens element, a negative lens element, and a positive lens element. At least the object-side positive lens element and the negative lens element are cemented together.The zoom lens system of the present invention satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?1.5<f2G/(fT/fW)<3.0  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1<f2G(mW−mT)/(fT/fW)<3  (2)in-line-formulae description="In-line Formulae" end="tail"?whereinf2G: the focal length of the positive second lens group;mW: the lateral magnification of the positive second lens group at the short focal length extremity; andmT: the lateral magnification of the positive second lens group at the long focal length extremity;fT: the focal length of the entire zoom lens system at the long focal length extremity; andfW: the focal length of the entire zoom lens system at the short focal length extremity.

REFERENCES:
patent: 5910860 (1999-06-01), Ozaki et al.
patent: 6025961 (2000-02-01), Kohno et al.
patent: 6268964 (2001-07-01), Ozaki et al.
patent: 6757108 (2004-06-01), Sensui et al.
patent: 6917477 (2005-07-01), Takatsuki
patent: 10-274739 (1998-10-01), None
patent: 11-142734 (1999-05-01), None
patent: 2002-014284 (2002-01-01), None
English Language Abstract of JP 10-274739.
English Language Abstract of JP 11-142734.

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