Zoom lens and imaging device having same

Details Zoom lens and imaging device having same Zoom lens and imaging device having same

2011-02-01

2011-02-01

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S687000, C348S240100

Reexamination Certificate

active

07880975

ABSTRACT:
A zoom lens includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power or a negative refractive power. The lens groups are arranged in order from the object side toward the image side. The focal lengths of the system at a wide angle end and a telephoto end, the focal lengths of the first and second lens groups, the distance between the position of the first lens group, the position being closest to the object side upon zooming, and the position of the first lens group at the wide angle end, and the difference between the largest distance between the first and second lens groups upon zooming and the distance between the first and second lens groups at the wide angle end are determined.

REFERENCES:
patent: 6594087 (2003-07-01), Uzawa
patent: 6825989 (2004-11-01), Uzawa
patent: 7057818 (2006-06-01), Hamano
patent: 7190529 (2007-03-01), Miyajima
patent: 7286304 (2007-10-01), Ohtake
patent: 7408720 (2008-08-01), Ito et al.
patent: 2010/0103532 (2010-04-01), Saito

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