Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2006-01-03
2006-01-03
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S691000, C359S717000, C359S708000, C359S689000, C359S686000, C359S793000, C359S754000, C359S680000
Reexamination Certificate
active
06982834
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, case of manufacture, and favorable correction of aberrations. The zoom lens includes at least one aspheric lens surface 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: 6351337 (2002-02-01), Tanaka
patent: 6498687 (2002-12-01), Sekita et al.
patent: 6545819 (2003-04-01), Nanba et al.
patent: 6735020 (2004-05-01), Sekita
patent: 6771433 (2004-08-01), Ohashi
patent: 2004/0095654 (2004-05-01), Watanabe
patent: 2000-284177 (2000-10-01), None
patent: 2001-296476 (2001-10-01), None
patent: 2003-35868 (2003-02-01), None
English Abstract attached.
Arnold Bruce Y.
Fujinon Corporation
Henry Jon W.
International Arnold
Lester Evelyn A.
LandOfFree
Wide-angle zoom lens including at least one aspheric lens... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wide-angle zoom lens including at least one aspheric lens..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wide-angle zoom lens including at least one aspheric lens... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3585080