Zoom lens and image capture apparatus

Details Zoom lens and image capture apparatus Zoom lens and image capture apparatus

2006-12-01

2008-03-11

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S557000, C359S689000

Reexamination Certificate

active

07342727

ABSTRACT:
A zoom lens includes, in the following order from an object side: a first lens group including negative refractive power; a second lens group including negative refractive power; and a third lens group. At least the second and third lens groups are movable along an optical axis to perform a zooming action. The second lens group is movable in a direction orthogonal to the optical axis to shift an image in a direction orthogonal to the optical axis. The following (1) and (2) are satisfied:in-line-formulae description="In-line Formulae" end="lead"?0.5<(1−βα)×βb<1.0, and   (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.1<|f1/f2|<1.25, where   (2)in-line-formulae description="In-line Formulae" end="tail"?βα is the magnification of the second lens group at a telephoto end of the zoom lens; βb is the magnification of a lens group on an image side relative to the second lens group; and f1, f2 are focal lengths of the first, second lens group, respectively.

REFERENCES:
patent: 6512633 (2003-01-01), Konno et al.
patent: 11-052245 (1999-02-01), None

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