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:
Jun. 22, 1999
Filed:
Jun. 19, 1997
Applicant:
Inventors:
Masao Takahashi, Fujisawa, JP;
Sakae Ikuta, Tokyo, JP;
Keiko Matsumoto, Kyoto, JP;
Kiyohisa Terai, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385128 ; 385109 ; 385102 ; 385 11 ; 385147 ;
Abstract
An optical fiber has a core structure and a first coating layer covering the core structure. The optical fiber, after being twisted, is covered at its outer side with a second coating layer. The second coating layer is higher in Young's modulus than the first coating layer. As a result, the twisting of the optical fiber is stably retained by the second coating layer. Further, an outer force coming from the second coating layer is absorbed by a soft first coating layer, so that no compressive force acts on a core and cladding in the optical fiber.