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

2009-05-27

2010-12-28

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07859766

ABSTRACT:
Provided is a zoom lens including in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; and a fourth lens unit having a positive refractive power, each of the first lens unit, the second lens unit, the third lens unit, and fourth lens unit moving to perform zooming, in which M3representing a moving amount of the third lens unit on an optical axis during zooming from a wide angle end to a telephoto end, Lt representing a total lens length on the telephoto end, f3representing a focal length of the third lens unit, and ft representing a focal length of an entire lens system on the telephoto end are each appropriately set.

REFERENCES:
patent: 6975461 (2005-12-01), Eguchi
patent: 7193790 (2007-03-01), Hamano
patent: 2007/0091460 (2007-04-01), Saruwatari et al.
patent: 07-128619 (1995-05-01), None
patent: 2006-106111 (2006-04-01), None

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