Zoom lens including at least four aspheric surfaces

Details Zoom lens including at least four aspheric surfaces Zoom lens including at least four aspheric surfaces

2005-07-19

2005-07-19

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

06919994

ABSTRACT:
A zoom lens includes, in order from the object side, a first lens group of negative refractive power, and second and third lens groups, each of positive refractive power. The second lens group includes a stop on its object side. Each of the first and second lens groups includes negative and positive refractive power elements and at least two aspheric surfaces. The third lens group is a single lens component. All but one lens component may be a single lens element. When zooming from the wide-angle end to the telephoto end, the first and second lens groups move closer together while the second lens group moves farther from the third lens group. The third lens group moves for focusing but not for zooming. The zoom lens satisfies specified conditions which insure compactness of the zoom lens when not in use, high-speed focusing, favorable correction of various aberrations, and bright images.

REFERENCES:
patent: 6349002 (2002-02-01), Shibayama et al.
patent: 6614599 (2003-09-01), Watanabe
patent: 6804064 (2004-10-01), Hirakawa
patent: 6819499 (2004-11-01), Watanabe
patent: 6822808 (2004-11-01), Nanba et al.
patent: 6862143 (2005-03-01), Hoshi et al.
patent: 2002/0149857 (2002-10-01), Nobe
patent: 2003/0072085 (2003-04-01), Mizuguchi et al.
patent: 2003/0227691 (2003-12-01), Saruwatari
patent: 10-293253 (1998-11-01), None
patent: 2000-284177 (2000-10-01), None
patent: 2002-196240 (2002-07-01), None

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