Zoom lens

Details Zoom lens Zoom lens

2007-07-30

2008-11-11

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07450320

ABSTRACT:
A zoom lens includes a first lens group with a negative refractive power and a second lens group with a positive refractive power, wherein the second lens group is disposed between the first lens group and an image side, and the first lens group and the second lens group are suitable for moving between an object side and the image side. In addition, the first lens group includes a first lens with a negative refractive power, and the first lens is a meniscus lens with a convex surface facing the object side and has an Abbe number greater than 50. A focal length of the zoom lens is F, a focal length of the first lens group is F1, a curvature radius of a surface facing the second lens group of the first lens is R2, and −0.6<F/F1<−0.2, 0.7<R2/F<1.8.

REFERENCES:
patent: 5541772 (1996-07-01), Lin
patent: 5710670 (1998-01-01), Ohno
patent: 6075658 (2000-06-01), Nagahara
patent: 6324014 (2001-11-01), Moskovich

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