Zoom lens system, imaging device and camera

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

2008-05-27

2010-06-22

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000, C359S680000

Reexamination Certificate

active

07742235

ABSTRACT:
A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein: the first lens unit comprises a first lens element having a concave surface at least on the image side and negative power and a second lens element having a convex surface at least on the object side and positive power; the second lens unit comprises a cemented lens element fabricated by two lens elements having optical power of mutually different signs and one single lens element; in zooming, all of the lens units move along an optical axis; and conditions (1): 5.0<αiW<20.0 and (I-2): n11≧1.9 (where, 3.2<fT/fWand ωW>35, αiWis an incident angle of a principal ray to an image sensor at a maximum image height at a wide-angle limit, n11is a refractive index of the first lens element to the d-line, ωW is a half view angle at a wide-angle limit, and fTand fWare focal lengths of the entire system at a telephoto limit and a wide-angle limit, respectively) are satisfied.

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