Zoom lens and image pickup apparatus having the zoom lens

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

2008-11-05

2009-12-08

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000

Reexamination Certificate

active

07630141

ABSTRACT:
A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power and configured to move along an optical axis during zooming, a second lens unit having a negative refractive power and configured to move with a locus convex towards the image side during zooming, a third lens unit having a positive refractive power, and a fourth lens unit having a negative refractive power. The first lens unit is located closer to the object side at a telephoto end than at a wide-angle end and the second lens unit is located closer to the image side at the telephoto end than at the wide-angle end. A focal length of the second lens unit (f2), a focal length of the zoom lens at the wide-angle end (fw), and a focal length of the zoom lens at the telephoto end (ft) are appropriately set.

REFERENCES:
patent: 5687401 (1997-11-01), Kawamura
patent: 6404561 (2002-06-01), Isono
patent: 6763186 (2004-07-01), Hamano
patent: 7177092 (2007-02-01), Satori
patent: 7218458 (2007-05-01), Saruwatari
patent: 7336419 (2008-02-01), Yamada
patent: 2003/0076591 (2003-04-01), Ohmori
patent: 2005/0270661 (2005-12-01), Nanba et al.
patent: 11-352401 (1999-12-01), None
patent: 2002-228931 (2004-08-01), None

Affiliated with

Also associated with

Rating

Zoom lens and image pickup apparatus having the zoom lens does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Zoom lens and image pickup apparatus having the zoom lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens and image pickup apparatus having the zoom lens will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4137487