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

2011-08-09

2011-08-09

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000, C348S240300

Reexamination Certificate

active

07995286

ABSTRACT:
A zoom lens includes first to fourth lens units in order from the object side to the image side. The first, third, and fourth lens units have a positive refractive power. The second lens unit has a negative refractive power. During zooming from a wide-angle end to a telephoto end, the first lens unit moves along a locus convex toward the image side, the second lens unit moves along a locus convex toward the image side from the wide-angle end to an intermediate zoom position and along a locus convex toward the object side from the intermediate zoom position to the telephoto end, and the third lens unit moves such that the distance to the second lens unit at the telephoto end is smaller than that at the wide-angle end. Focal lengths of the first lens unit and the entire lens system at the telephoto end are adequately set.

REFERENCES:
patent: 5963378 (1999-10-01), Tochigi
patent: 6166864 (2000-12-01), Horiuchi
patent: 7057818 (2006-06-01), Hamano et al.
patent: 7190529 (2007-03-01), Miyajima et al.
patent: 7206137 (2007-04-01), Nakatani
patent: 2007-212537 (2007-08-01), None

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