Zoom lens

Details Zoom lens Zoom lens

2006-07-04

2006-07-04

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07072121

ABSTRACT:
A zoom lens is provided. The zoom lens includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a negative refractive power. Here, the first through third lens groups are sequentially arranged from an object side toward an image side. At least the second lens group is moved along an optical axis to change magnification. The expression3.7<LTFW<5.4is satisfied, where LTdenotes a distance on the optical axis from an object-side plane of the first lens group to an image plane at a wide-angle end, and FWdenotes an overall focal length of the zoom lens at the wide-angle end. Accordingly, the zoom lens is miniaturized and minimizes a change in aberration due to high magnification.

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patent: 5539582 (1996-07-01), Kohno et al.
patent: 02-063007 (1990-03-01), None
patent: 06-094996 (1994-04-01), None
patent: 2000-338425 (2000-08-01), None
patent: 2003-322796 (2003-11-01), None

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