Zoom lens system, imaging device and camera

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

2011-08-16

2011-08-16

Choi, William (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

08000025

ABSTRACT:
A zoom lens system, in order from an object side to an image side, comprising a first lens unit of positive power, a second lens unit of negative power, a third lens unit of positive power, and a fourth lens unit of positive power, wherein the first lens unit is composed of three or fewer lens elements, wherein the second lens unit is composed of three lens elements, wherein in zooming, the first to the fourth lens units are moved individually along an optical axis such that air spaces should vary, so that variable magnification is achieved, and wherein the conditions are satisfied: 2.00≦D/fW≦4.68, ωW≧35 and fT/fW≧10 (D is a total of an optical axial thickness of each lens unit, ωWis a half view angle at a wide-angle limit, and fTand fWare focal lengths of the entire system respectively at a telephoto limit and at a wide-angle limit), an imaging device and a camera are provided.

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