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. 01, 2005
Filed:
Dec. 10, 2001
Hiroshi Koshi, Osaka, JP;
Yasuji Sasaki, Osaka, JP;
Hiroshi Koshi, Osaka, JP;
Yasuji Sasaki, Osaka, JP;
Nippon Sheet Glass Co., Ltd., Osaka, JP;
Abstract
A light source-optical fiber coupler constituted by: a light source (such as a semiconductor laser chip); and a gradient index rod lensfor coupling diffuse luminous flux emitted from the light source to an end surface of an optical fiber (such as a single mode optical fiber). The gradient index rod lens has a light source side end surface shaped like a convex spherical surface, and an optical fiber side end surface shaped like a flat surface. The gradient index rod lens is retained by the housing in the condition that the light source (laser chip) and the gradient index rod lens are disposed close to each other. The distance between a surface of the laser chip and an end surface of the gradient index rod lens is preferably selected to be not larger than 0.3 mm and more preferably in a range of from about 0.2 mm to about 0.25 mm.