Zoom lens and image pickup apparatus having the same

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

2011-03-08

2011-03-08

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

07903345

ABSTRACT:
A zoom lens includes, 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 and configured to move during zooming, a third lens unit having a positive refractive power and configured to move during zooming, and a fourth lens unit having a positive refractive power and configured not to move for zooming. In the zoom lens, the second lens unit includes at least one positive lens and at least one negative lens. Furthermore, in the zoom lens, average values of Abbe number (ν) and relative partial dispersion (θ) of materials of the at least one negative lens (νna, θna) and average values of Abbe number (ν) and relative partial dispersion (θ) of materials of the at least one positive lens (νpa, θpa) satisfy an appropriate condition.

REFERENCES:
patent: 2698555 (1955-01-01), McCarthy
patent: 3868174 (1975-02-01), Yakota
patent: 4439017 (1984-03-01), Yamaguchi
patent: 6404561 (2002-06-01), Isono
patent: 6594087 (2003-07-01), Uzawa
patent: 6940656 (2005-09-01), Oomura et al.
patent: 7505213 (2009-03-01), Tsutsumi
patent: 2004/0169934 (2004-09-01), Oomura
patent: 2001-194590 (2001-07-01), None
patent: 2002-062478 (2002-02-01), None
patent: 2004-264458 (2004-09-01), None
patent: 2004-264459 (2004-09-01), None
patent: 2008-40395 (2008-02-01), None
Warren J. Smith, “Modern Optical Engineering: The Design of Optical Systems”, 1966, McGraw-Hill, XP002564589.
R.S. Longhurst: “Geometrical and Physical Optics”, 1963, Longmans, XP002564590.

Affiliated with

Also associated with

Rating

Zoom lens and image pickup apparatus having the same 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 same, 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 same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2737896