Zoom optical system, image sensing device, and digital...

Details Zoom optical system, image sensing device, and digital... Zoom optical system, image sensing device, and digital...

2008-03-18

2009-12-15

Mack, Ricky L (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

07633686

ABSTRACT:
A zoom optical system includes first through fourth lens groups having negative-positive-negative-positive optical powers. Assuming that a curvature radius of an object-side lens surface of a negative lens element in the first lens group is r1, a curvature radius of an image-side lens surface of the negative lens element in the first lens group is r2, a focal length of the third lens group is f3, a focal length of the entirety of the optical system at the wide angle end is fw, a focal length of the entirety of the optical system at the telephoto end is ft, and an average refractive index of positive lens elements in the second lens group is nd2p, the zoom optical system satisfies the conditional expressions:in-line-formulae description="In-line Formulae" end="lead"?0<(r1+r2)/(r1−r2)<1.0in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−0.9<f3/√{square root over ( )}(fw×ft)<−0.4in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.6<ndp2.in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 7042651 (2006-05-01), Kuba et al.
patent: 7177095 (2007-02-01), Sugiyama et al.
patent: 2005/0030641 (2005-02-01), Kuba et al.
patent: 2005/0259334 (2005-11-01), Sekita
patent: 2008/0117525 (2008-05-01), Ichikawa et al.

Affiliated with

Also associated with

Rating

Zoom optical system, image sensing device, and digital... 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 optical system, image sensing device, and digital..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom optical system, image sensing device, and digital... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4065559