Zoom lens system, imaging device and camera

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

2006-11-29

2008-11-18

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S689000

Reexamination Certificate

active

07453648

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 in zooming from a wide-angle limit to a telephoto limit, the lens units move respectively along an optical axis in such a manner that an interval between the first lens unit and the second lens unit decreases while an interval between the second lens unit and the third lens unit changes so that variable magnification is achieved, the first lens unit comprises one object side negative lens element and one image side positive lens element with a convex surface facing the object side, which have an aspheric surface, and the conditions: n12>1.88 and ν12<26 (n12 and ν12 are refractive index and Abbe number, respectively, of the image side positive lens element of the first lens unit) are satisfied.

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patent: 7046452 (2006-05-01), Ori
patent: 7061685 (2006-06-01), Itoh
patent: 7215482 (2007-05-01), Matsusaka
patent: 7310191 (2007-12-01), Kurioka
patent: 11-149044 (1999-06-01), None
patent: 2005-84597 (2005-03-01), None
patent: 2005-134746 (2005-05-01), None

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