Zoom lens system, imaging device and camera

Details Zoom lens system, imaging device and camera Zoom lens system, imaging device and camera

2008-09-11

2011-11-22

Choi, William (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

08064144

ABSTRACT:
A zoom lens system according to the present invention, from an object side to an image side, comprises a first lens unit having positive optical power, a second lens unit having negative optical power, a third lens unit having positive optical power, and a fourth lens unit having positive optical power. In zooming, the first to the fourth lens units all move along the optical axis. The condition (8): 0.15<dG3/dG<0.27 is satisfied (where, 16<fT/fW, ω>35; dG3 is an optical axial center thickness of the third lens unit; dG is a sum of the optical axial thicknesses of the first to the fourth lens units; ω is a half view angle at a wide-angle limit; fTis a focal length of the entire system at a telephoto limit; and fWis a focal length of the entire system at a wide-angle limit). As a result, the zoom lens system has a reduced size and still realizes a wide view angle at a wide-angle limit, as well as a remarkably high zooming ratio and high performance.

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