High zoom ratio zoom lens system

Details High zoom ratio zoom lens system High zoom ratio zoom lens system

2008-05-06

2008-05-06

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S687000, C359S691000

Reexamination Certificate

active

07369325

ABSTRACT:
Providing a high zoom ratio zoom lens system having a short total lens length and a small diameter of the first group despite of securing excellent optical performance, a half angle of view of 3.5° or less in the telephoto end, an f-number of 6 or less in the telephoto end, and a zoom ratio of about 10 or more. The system is composed of a first group having positive power, a second group having negative power, a third group having positive power, and a fourth group having positive power. The first group is composed of, in order from the object, a negative meniscus lens having a convex surface facing the object, a first positive lens having a convex surface facing the object, and a second positive lens. All groups moves along the optical axis upon zooming from a wide-angle end to a telephoto end. Given conditions are satisfied.

REFERENCES:
patent: 5570233 (1996-10-01), Mihara et al.
patent: 5712733 (1998-01-01), Mukaiya
patent: 7136231 (2006-11-01), Ito et al.
patent: 7190529 (2007-03-01), Miyajima et al.
patent: 2002/0097503 (2002-07-01), Kohno et al.
patent: 7-20381 (1995-01-01), None
patent: 7-20381 (1995-01-01), None
patent: 8-201695 (1996-08-01), None
patent: 10-39213 (1998-02-01), None
patent: 10-39213 (1998-02-01), None
patent: 8-201695 (1998-09-01), None

Affiliated with

Also associated with

Rating

High zoom ratio zoom lens system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High zoom ratio zoom lens system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High zoom ratio zoom lens system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2810193