Dual-focus switchable lens

Details Dual-focus switchable lens Dual-focus switchable lens

2007-11-06

2007-11-06

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

11527600

ABSTRACT:
A dual-focus switchable lens is provided and includes: in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power and a third lens group having a positive refractive power. The first lens group includes a lens having a negative refractive power and a lens having a positive refractive power in order from the object side, at least one of the lenses being an aspherical lens. The second lens group includes a cemented lens and a single lens having an aspherical surface and having a negative refractive power in order from the object side. The third lens group is a positive lens. Two focal points of the dual-focus switchable lens is switched by moving the second lens group while maintaining the first and third lens groups substantially stationary, and the dual-focus switchable lens satisfies specific conditional expressions.

REFERENCES:
patent: 4779969 (1988-10-01), Sato et al.
patent: 6839184 (2005-01-01), Shan
patent: 7006300 (2006-02-01), Shinohara
patent: 2005/0046960 (2005-03-01), Saori
patent: 2005/0057817 (2005-03-01), Ori
patent: 2006/0082900 (2006-04-01), Sugiyama et al.
patent: 2006/0262423 (2006-11-01), Kiyotoshi
patent: 2007/0053072 (2007-03-01), Nanba
patent: 10-206732 (1998-08-01), None
patent: 2004-93647 (2004-03-01), None
patent: 2004-252294 (2004-09-01), None
patent: 2005-84647 (2005-03-01), None
patent: WO-99/35517 (1999-07-01), None

Affiliated with

Also associated with

Rating

Dual-focus switchable 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 Dual-focus switchable lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual-focus switchable lens will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3872278