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:
May. 29, 1990
Filed:
Nov. 17, 1988
Applicant:
Inventors:
Akira Yokota, Hachiouji, JP;
Masao Kuga, Hachiouji, JP;
Assignee:
Olympus Optical Co. Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
350432 ; 350 9618 ; 350 9624 ;
Abstract
An illumination optical system for endoscopes wherein, in order to make it possible to make an illumination of a uniform and sufficient brightness over a wide range of the surface of an object to be observed, a cover lens arranged in front of the exit end face of a light guide is so formed that its surface on the object side may be a convex aspherical surface or may be a convex spherical surface or may have a concave center part and larger in the refractive index in the peripheral part than in the center part. The light guide may be a light emitting device.