Zoom lens and image-taking device

Details Zoom lens and image-taking device Zoom lens and image-taking device

2007-02-01

2008-05-13

Mai, Huy (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07372636

ABSTRACT:
A zoom lens including subsequently from an object side of the zoom lens to an image side of the zoom lens: a first lens group with a positive focal length; a second lens group with a negative focal length, an aperture arranged on an object side of a third lens group; the third lens group with a positive focal length, a forth lens group with a positive focal length. By zooming from a short focal end to a long focal end, an interval between the first lens group and the second lens group increases, an interval between the second lens group and the third lens group decreases, an interval between the third lens group and the fourth lens group increases. The first lens group has sequentially from an object side of the first lens group: a negative meniscus lens L1having a convex surface facing the object; a positive lens L2; satisfying a conditional expression: Nd11>1.96 (Nd11: a refractive index of the negative meniscus lens L1.

REFERENCES:
patent: 7061686 (2006-06-01), Ohtake
patent: 2004-199000 (2004-07-01), None
patent: 2004-286811 (2004-10-01), None
patent: 2004-354870 (2004-12-01), None
patent: 2005-181556 (2005-07-01), None
patent: 2007-108531 (2007-04-01), None
patent: 2007-178846 (2007-07-01), None

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