Zoom lens and imaging apparatus

Details Zoom lens and imaging apparatus Zoom lens and imaging apparatus

2011-06-07

2011-06-07

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C348S240300, C359S680000, C359S689000

Reexamination Certificate

active

07957070

ABSTRACT:
A zoom lens includes: first, second and third lens groups having negative refracting power, positive refracting power and positive refracting power, respectively, disposed in the order listed from an object side to an image side, wherein during zooming from a wide angle end to a telephoto end, the first lens group is moved and the second lens group is moved toward the object such that an air space between the first and second lens groups decreases and an air space between the second and third lens groups increases; and the first lens group is formed by first and second lenses, the first and second lenses being disposed in the order listed from the object side to the image side, and the zoom lens satisfying the following Conditional Expressions (1) and (2)in-line-formulae description="In-line Formulae" end="lead"?nd12>2.0  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?νd12<21.6  (2).in-line-formulae description="In-line Formulae" end="tail"?

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English-language translation of JP 2010-122625-A, Machine Translation obtained from IPDL Industrial Property Digital Library <http://www.ipdl.inpit.go.jp/homepg—e.ipdl> on Feb. 8, 2011.
English-language translation of “Selected JPO Prosecution documents” for priority basis 2008-298523, filed Nov. 21, 2008; obtained from USPTO/EAST Foreign Application Download Manager on Feb. 8, 2011.
Japanese Office Action issued Aug. 26, 2010 for corresponding Japanese Application No. 2008-298523.

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