Zoom lens and image pickup apparatus having the same

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

2008-01-01

2008-01-01

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S557000, C359S683000, C359S690000

Reexamination Certificate

active

11627507

ABSTRACT:
At least one exemplary embodiment is directed to a zoom lens configured to correct chromatic aberration and having a high optical performance over the entire zoom range. The zoom lens includes, in order from an object side to an image side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, and a third lens unit of positive refractive power. During zooming, an interval between respective adjacent lens units varies. The third lens unit includes an optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition:in-line-formulae description="In-line Formulae" end="lead"?θgF−(−1.665×10−7·νd3+5.213×10−5·νd2−5.656×10−3·νd +0.755)>0.in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 4913535 (1990-04-01), Robb
patent: 6999240 (2006-02-01), Yamada et al.
patent: 7088521 (2006-08-01), Hamano et al.
patent: 7139130 (2006-11-01), Yamada

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