Optical: systems and elements – Lens – With variable magnification
Patent
1995-09-25
1998-03-03
Nelms, David C.
Optical: systems and elements
Lens
With variable magnification
359683, G02B 1514
Patent
active
057241929
ABSTRACT:
A wide-angle zoom lens system which can reduce variation in aberrations and obtain a sufficient back focus distance at the wide angle position by making the view angle wide at the wide angle position and making the whole length of the optical system short at the telephoto position. The wide-angle zoom lens system, includes a first lens group having a positive refractive power; a second lens group having a positive refractive power; and a third lens group having a negative refractive power, the distances between the first lens group, the second lens group, and the third lens group change during zooming, wherein the first lens group includes a first lens having a negative refractive power with a shape of a meniscus lens concave toward an object, a second lens having a positive refractive power and a third lens having a negative refractive power, the first, second and third lens groups are made of spherical lenses, the distance between the first and second lens groups is increased, and the distance between the second and third lens groups is reduced; and wherein the zoom lens system has the following characteristics: -0.5<(R.sub.1a1 +R.sub.1a2) / (R.sub.1a1 -R.sub.1a2)<-2.0 wherein R.sub.1a1 is a curvature radius toward the object of a lath lens in the first lens group, and R.sub.1a2 is the curvature radius toward the image plane of the lath lens in the first lens group.
REFERENCES:
patent: 5315439 (1994-05-01), Ito
patent: 5528429 (1996-06-01), Hagimori
patent: 5530593 (1996-06-01), Shibayama et al.
patent: 5566026 (1996-10-01), Yoon
Nelms David C.
Samsung Aerospace Industries Ltd.
Schwartz Jordan M.
LandOfFree
Wide-angle 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 Wide-angle zoom lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wide-angle zoom lens will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2254163