Zoom lens

Details Zoom lens Zoom lens

2006-02-07

2006-02-07

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000

Reexamination Certificate

active

06995924

ABSTRACT:
A zoom lens includes at least two lens groups that move for zooming. An object-side lens group is formed of a lens component having negative refractive power and a meniscus shape and a second lens component having positive refractive power and a meniscus shape, which may be in that order from the object side. Each of these lens components may be formed of a single lens element. Lens elements of the lens components satisfy certain conditions related to the half-field angle at the wide-angle end and the Abbe numbers of the lens elements. The zoom lens may include a third lens group, which may be stationary, with a middle lens group that moves nearer the object-side lens group and farther from the third lens group during zooming from the wide-angle end to the telephoto end. At least one surface of a lens component may be an aspheric surface.

REFERENCES:
patent: 6351337 (2002-02-01), Tanaka
patent: 6498687 (2002-12-01), Sekita et al.
patent: 6545819 (2003-04-01), Nanba et al.
patent: 6771433 (2004-08-01), Ohashi
patent: 6836375 (2004-12-01), Ito
patent: 6919994 (2005-07-01), Tanaka
patent: 6943960 (2005-09-01), 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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