Zoom lens and image pickup apparatus

Details Zoom lens and image pickup apparatus Zoom lens and image pickup apparatus

2007-09-12

2009-02-03

Mack, Ricky L (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000, C359S680000

Reexamination Certificate

active

07486448

ABSTRACT:
A zoom lens includes, in order from an object side to an image side, first, second, and third lens units having negative, positive, and positive refractive power, respectively. The zoom lens performs zooming by varying distances between the lens units. The second lens unit includes a first lens subunit composed of positive and negative lens elements, and a second lens subunit arranged on the image side of the first lens subunit and composed of positive and negative lens elements. The following conditions are satisfied:in-line-formulae description="In-line Formulae" end="lead"?ν1n<29,in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?ν2n<30,in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?18<ν1p−Θ1n<35, andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?26<ν2p−ν2n<35,in-line-formulae description="In-line Formulae" end="tail"?where ν1pand ν1nrespectively represent Abbe numbers of materials of the positive and negative lens elements of the first lens subunit, and ν2pand ν2nrespectively represent Abbe numbers of materials of the positive and negative lens elements of the second lens subunit.

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