The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 10, 2015
Filed:
Mar. 17, 2014
Olympus Medical Systems Corp., Tokyo, JP;
Akari Kanazawa, Tokyo, JP;
Tsutomu Igarashi, Tokyo, JP;
Olympus Medical Systems Corp., Tokyo, JP;
Abstract
Provided is an endoscope objective optical systemincluding, in order from an object side, a first lenscomposed of a negative single lens, a second lenscomposed of a positive single lens, an aperture stop, a third lenscomposed of a positive single lens, and a fourth lenscomposed of a positive combined lens, wherein the third lenshas a meniscus shape having a convex surface facing the image side. The endoscope objective optical system () satisfies the following conditions:0.3<<1.15,  (1)1<1.79,  (2)2>1,  (3)0.6<<0.83,  (4) and|1|−|2|+1>1.8  (5)wherein Df is the distance from a surface of the first lens facing the object side to the aperture stop, f is the focal length of the entire system, n1 is the refractive index of the first lens (d-line), n2 is the refractive index of the second lens (d-line), IH is the maximum image height of the entire system, r1 is the radius of curvature of a surface of the third lens facing the object side, r2 is the radius of curvature of the surface of the third lens facing the image side, and d1 is the center thickness of the third lens.