Endoscope objective lens

Details Endoscope objective lens Endoscope objective lens

2007-05-15

2007-05-15

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Microscope objective

C359S784000

Reexamination Certificate

active

11434809

ABSTRACT:
To provide an endoscope objective lens which has a lens constitution of a relatively small number of three pieces, a short total length of lens, and various kinds of good optical performances starting with curvature of field. It is constituted of a first lens L1directing its concave surface to the image side, a second lens L2made of a positive meniscus lens directing its convex surface to the image side, and a third lens L3made of a planoconvex lens directing its convex surface to the object side arranged sequentially from the object side, and a stop placed between said first lens L1and said second lens L2. It also satisfies the following Conditional Expressions:in-line-formulae description="In-line Formulae" end="lead"?2.00<|f1/f|<3.00,  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.50<|f2/f3|<0.70,  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?2.00<|f1/d1-2|<5.00 ,  (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.40<|R2R/R2F|<0.60 .  (4)in-line-formulae description="In-line Formulae" end="tail"?Note that f is the focal length of the whole system, f1–f3the focal lengths of the first-third lenses, respectively, d1-2the air distance between the first lens and the second lens, R2Fthe radius of curvature of the object-side surface of the second lens, and R2Rthe radius of curvature of the image-side surface of the second lens.

REFERENCES:
patent: 4984878 (1991-01-01), Miyano
patent: 5223982 (1993-06-01), Suzuki et al.
patent: 5418649 (1995-05-01), Igarashi
patent: 7027231 (2006-04-01), Miyano
patent: 2-176612 (1990-07-01), None
patent: 9-68647 (1997-03-01), None
patent: 2004-264835 (2004-09-01), None

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3822992