Zoom lens and imaging apparatus incorporating the same

Details Zoom lens and imaging apparatus incorporating the same Zoom lens and imaging apparatus incorporating the same

2008-12-30

2009-11-24

Martinez, Joseph (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S432000, C359S676000, C359S677000, C359S740000

Reexamination Certificate

active

07623306

ABSTRACT:
A zoom lens comprises, in order from its object side, a front lens group having negative refracting power at a wide-angle end and a rear lens group having positive refracting power at the wide-angle end. The front lens group comprises, in order from the object side, a first lens group of positive refracting power and a second lens group of negative refracting power, and the rear lens group comprises, in order from the object side, a third lens group of positive refracting power and a fourth lens group of positive refracting power. There is an aperture stop interposed between the lens surface located in, and nearest to the object side of, the second lens group and the lens surface located in, and nearest to the image size of, the third lens group. Upon zooming from the wide-angle end to the telephoto end, the spacing between the first lens group and the second lens group grows wide, the spacing between the second lens group and the third lens group becomes narrow, the spacing between the third lens group and the fourth lens group changes, and an F-number grows greatest when the aperture stop is open in the course of zooming from the wide-angle end to the telephoto end.

REFERENCES:
patent: 6633437 (2003-10-01), Hoshi et al.
patent: 2005/0190457 (2005-09-01), Ohashi
patent: 2006/0098301 (2006-05-01), Miyajima
patent: 2005-242116 (2005-09-01), None
patent: 2005-326743 (2005-11-01), None
patent: 2006-78979 (2006-03-01), None
patent: 2006-171055 (2006-06-01), None

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