Zoom lens system

Details Zoom lens system Zoom lens system

2006-05-30

2006-05-30

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S691000

Reexamination Certificate

active

07054072

ABSTRACT:
A zoom lens includes (i) a negative first lens group having a negative meniscus first lens element and a positive meniscus second lens element; and (ii) a positive second lens group having a positive third lens element, a positive fourth lens element, a negative fifth lens element which is cemented to the positive fourth lens element, and a sixth lens element having a weaker refractive power. Zooming is performed by moving the first lens group and the second lens group along the optical axis. The zoom lens system satisfies TL/fW<1.9; and 0.6<fW/fII<0.77, wherein TL is the sum of the length of the first lens group and that of the second lens group; fWis the combined focal length of the zoom lens at the wide-angle extremity; and fIIis the focal length of the second lens group.

REFERENCES:
patent: 5668669 (1997-09-01), Ohtake et al.
patent: 6862143 (2005-03-01), Hoshi et al.
patent: 2003-57542 (2003-02-01), None

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