Imaging lens

Details Imaging lens Imaging lens

2008-03-11

2008-03-11

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S716000

Reexamination Certificate

active

11727606

ABSTRACT:
An imaging lens comprises, in order from an object side:a first lens having a positive refractive power;a second lens having a negative refractive power whose concave surface faces to the object; anda third lens having a positive refractive power and having a meniscus form that has a convex surface, facing to the object, in a portion at and around an optical axis of the imaging lens;wherein the first, second and third lenses have at least one aspheric surface, andwherein the imaging lens satisfies conditional expressions given below:in-line-formulae description="In-line Formulae" end="lead"?0.7<f1/f<1.3   (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.3<D2/f<0.5   (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.0<|f2/f|<3.0   (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.2<f3/f<4.0   (4)in-line-formulae description="In-line Formulae" end="tail"?wheref: a focal length of an overall system,f1: a focal length of the first lens,f2: a focal length of the second lens,f3: a focal length of the third lens, andD2: a spacing, on the optical axis, between the first lens and the second lens.

REFERENCES:
patent: 6961191 (2005-11-01), Sato
patent: 6985306 (2006-01-01), Abe
patent: 7110188 (2006-09-01), Matsui et al.
patent: 7262925 (2007-08-01), Huang
patent: 2001/0028511 (2001-10-01), Sensui
patent: 2004/0190162 (2004-09-01), Sato
patent: 2005/0041306 (2005-02-01), Matsuo
patent: 1 348 990 (2003-10-01), None
patent: 2004-302058 (2004-10-01), None
patent: 2005-173319 (2005-06-01), None
patent: 2005-227755 (2005-08-01), None
patent: 2005-292235 (2005-10-01), None

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3906131