Wide-angle zoom lens

Details Wide-angle zoom lens Wide-angle zoom lens

2006-01-10

2006-01-10

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S689000

Reexamination Certificate

active

06985300

ABSTRACT:
A three-group zoom lens includes first, second, and third lens groups, of negative, positive, and positive refractive power, respectively. The second lens group includes a stop and the third lens group moves for focusing. When zooming from the wide-angle end to the telephoto end, the first and second lens groups become closer together and the second and third lens groups become farther apart. The zoom lens preferably satisfies specified conditions that ensure compactness, ease of manufacture, and favorable correction of aberrations. The zoom lens includes an aspheric lens component with lens surfaces defined by an aspheric lens equation that includes at least one non-zero coefficient of an even power of Y, and at least one non-zero coefficient of an odd power of Y, where Y is the distance of a point on the aspheric lens surface from the optical axis.

REFERENCES:
patent: 5969878 (1999-10-01), Koizumi
patent: 2004/0156121 (2004-08-01), Ori et al.
patent: 2000-284177 (2000-10-01), None
patent: 2001-296476 (2001-10-01), None
patent: 2003-35868 (2003-02-01), None

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