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

2011-01-04

2011-01-04

Martinez, Joseph (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S774000

Reexamination Certificate

active

07864444

ABSTRACT:
Provided is a zoom lens having a high magnification and excellent optical performance over an entire zoom range between a wide-angle end and a telephoto end. The zoom lens includes, in order from object side to 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, and performs zooming while the respective lens units move, in which: during zooming from wide-angle end to telephoto end, the first unit moves closer to object side at telephoto end than at wide-angle end and the fourth unit moves along a locus convex to object side; and a focal length of the second unit, a focal length of the zoom lens at wide-angle end, and an imaging magnification of the fourth unit at telephoto end are appropriately set.

REFERENCES:
patent: 5585966 (1996-12-01), Suzuki
patent: 6016228 (2000-01-01), Uzawa
patent: 6975461 (2005-12-01), Eguchi
patent: 7190529 (2007-03-01), Miyajima et al.
patent: 7206137 (2007-04-01), Nakatani et al.

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