Objective lens for endoscope

Details Objective lens for endoscope Objective lens for endoscope

2005-10-18

2005-10-18

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Microscope objective

C359S770000

Reexamination Certificate

active

06956703

ABSTRACT:
An objective lens for endoscopes comprises a front lens unit component and a rear lens unit component, between which a stop is located, wherein a front lens unit component comprises, in order from the object side, a first lens having a negative refractive power and a second lens having a positive refractive power which directs a surface of the small radius of curvature toward the object side; wherein a rear lens unit component comprises a third lens having a positive refractive power which directs a surface of the small radius of curvature toward the image side, a fourth lens having a positive refractive power and a fifth lens having a negative refractive power; and wherein the fourth lens and the fifth lens are cemented, and satisfying the following condition:in-line-formulae description="In-line Formulae" end="lead"?2.0<|f3/f|<3.0in-line-formulae description="In-line Formulae" end="tail"?where f is the composite focal length of the total system and f3is the focal length of the third lens.

REFERENCES:
patent: 4764001 (1988-08-01), Yokota
patent: 4984878 (1991-01-01), Miyano
patent: 5296971 (1994-03-01), Mori
patent: 5587839 (1996-12-01), Miyano et al.
patent: 5777797 (1998-07-01), Miyano
patent: 6181481 (2001-01-01), Yamamoto et al.
patent: 01-007828 (1990-07-01), None
patent: 62-117629 (1998-11-01), None

Affiliated with

Also associated with

Rating

Objective lens for endoscope does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3476854