Zoom lens and image pickup apparatus equipped with same

Details Zoom lens and image pickup apparatus equipped with same Zoom lens and image pickup apparatus equipped with same

2011-03-15

2011-03-15

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C348S240300

Reexamination Certificate

active

07907349

ABSTRACT:
A zoom lens includes, in order from the object side thereof, a first lens unit having a positive refracting power, which is movable during zooming, a second lens unit having a negative refracting power, which is movable during zooming, a third lens unit having a positive refracting power, which is movable during zooming, a fourth lens unit having a positive refracting power, which is movable during zooming, a fifth lens unit having a positive refracting power, which is movable or stationary during zooming. The zoom lens further includes an aperture stop that moves integrally with the third lens unit during zooming. The first lens unit is located closer to the object side at the telephoto end than at the wide angle end, and the third lens unit is located closer to the object side at the telephoto end than at the telephoto end. The first lens unit is composed of only one cemented lens made up of a negative lens element and a positive lens element arranged in order from the object side, and the third lens unit includes at least two positive lens elements. The zoom lens satisfies a certain condition.

REFERENCES:
patent: 7342730 (2008-03-01), Yoneyama
patent: 7692872 (2010-04-01), Hankawa et al.
patent: 2006/0291070 (2006-12-01), Terada et al.
patent: 2005-055625 (2005-03-01), None
patent: 2005-107273 (2005-04-01), None
patent: 2007-010695 (2007-01-01), None

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