Zoom lens and image pickup apparatus including the same

Details Zoom lens and image pickup apparatus including the same Zoom lens and image pickup apparatus including the same

2008-01-30

2009-06-09

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S554000, C359S557000

Reexamination Certificate

active

07545580

ABSTRACT:
A zoom lens includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power. The zoom lens performs zooming by moving each of the lens units. The first lens unit and the third lens unit are positioned closer to the object at a telephoto end than at a wide-angle end. The zoom lens satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?0.3<|m1/m2|<1.5in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.3<|m3/m2|<0.8in-line-formulae description="In-line Formulae" end="tail"?where m1,m2,and m3are the amounts of movement of the first lens unit, the second lens unit, and the third lens unit, respectively, along an optical axis during zooming from the wide-angle end to the telephoto end.

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patent: 2005/0007480 (2005-01-01), Hamano et al.
patent: 2003-032504 (2003-01-01), None

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