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

2007-10-09

2009-11-10

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S695000

Reexamination Certificate

active

07616385

ABSTRACT:
A zoom lens performs zooming by moving a plurality of lens units, and includes a front lens unit disposed on an object side of an aperture stop and at least one diffractive optical part having positive power, and a rear lens unit disposed on an image side of the aperture stop including at least one refractive optical element made of a solid material and having a positive refractive power. When νd and θgF are the Abbe number and the partial dispersion ratio, respectively, of the material of the refractive optical element, and fD and fN are the focal lengths of the diffractive optical part and the refractive optical element, respectively, in air, the following expressions are satisfied:in-line-formulae description="In-line Formulae" end="lead"?0.755<θgF−(−1.665×10−7·νd3+5.213×10−5·νd2−5.656×10−3·νd)<1.011, andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?80<fD/fN<800.in-line-formulae description="In-line Formulae" end="tail"?

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