Zoom lens

Details Zoom lens Zoom lens

2007-03-13

2007-03-13

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000

Reexamination Certificate

active

11263863

ABSTRACT:
The invention is concerned with a high-zoom-ratio, high-performance zoom lens that is much more improved in compactness. The zoom lens comprises a first lens group G1of positive refracting power, a second lens group G2of negative refracting power, a third lens group G3of positive refracting power and a fourth lens group G4of positive refracting power, with a varying space between adjacent lenses during zooming. Upon zooming from the wide-angle end to the telephoto end of the zoom lens system, the first lens group G1is positioned nearer to the object side at the telephoto end than at the wide-angle end. The zoom lens of the invention satisfies a specific condition for properly defining the refracting power of the first lens group and a specific condition for defining the transverse magnification of the second lens group.

REFERENCES:
patent: 6191895 (2001-02-01), Arimoto et al.
patent: 6462886 (2002-10-01), Hagimori
patent: 7126762 (2006-10-01), Yoshitsugu
patent: 2006/0098301 (2006-05-01), Miyajima

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