Zoom lens and image capture apparatus

Details Zoom lens and image capture apparatus Zoom lens and image capture apparatus

2007-05-22

2009-06-02

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000, C359S684000

Reexamination Certificate

active

07542212

ABSTRACT:
A zoom lens includes in order and from the side of an object, a first lens group having a positive refractive power and fixed in position, a second lens group having a negative refractive power and movable in position for providing mainly zooming, a third lens group having a positive refractive power and fixed in position, a fourth lens group having a positive refractive power and movable in position for performing a focal position correction due to the zooming and for focusing, and a fifth lens group including a single lens fixed in position.Each of the lens groups from the third lens group to the fifth lens group has at least one aspheric surface, and conditional equations (1) and (2) below are satisfied.in-line-formulae description="In-line Formulae" end="lead"?|f4/f5|<0.12  (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.9<β5<1.2  (4)in-line-formulae description="In-line Formulae" end="tail"?where f4 is a focal length of the fourth lens group, f5 is a focal length of the fifth lens group, and β5 is a transverse magnification of the fifth lens group.

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European Search Report; Application No./Patent No. 07252148.7—2217; Dated: Sep. 7, 2007.

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