Patent ID: 8403836
Filing Date: 2013-03-26
Classification: A61B,G02B

Abstract:
1. A light guide for transmitting light and outputting said light from a light exit surface comprising: a tubular housing; a multimode optical fiber inserted through said housing, said multimode optical fiber having a core and a clad covering an outer circumferential surface of said core, said core having a tapered core whose diameter decreases toward said light exit surface, said clad having a tapered clad whose outer circumferential surface is inclined to be tapered along an outer circumferential surface of said tapered core toward said light exit surface, and a transparent adhesive member provided between said housing and an outer circumferential surface of said clad, said adhesive member retaining said multimode optical fiber in said housing, said adhesive member having a lower refractive index than said clad, said adhesive member having a light passing space hollowed out to a predetermined depth from said light exit surface so as to expose at least a part of said outer circumferential surface of said tapered clad to air.