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:
Dec. 17, 2019
Filed:
May. 20, 2016
Sumita Optical Glass, Inc., Saitama-shi, Saitama, JP;
Sumita Optical Glass, Inc., Saitama-shi, Saitama, JP;
Abstract
Provided is an image guide fiber that improves image quality while preventing a manufacturing problem. The image guide fiber according to the present disclosure has a numerical aperture NA in the range of 0.70 to 0.90. A linear thermal expansion coefficient difference Δα, which is a value obtained by subtracting a linear thermal expansion coefficient αat from 100 to 300° C. of clad glass, from a linear thermal expansion coefficient αat from 100 to 300° C. of core glass, is in the range of −3×10° C. to 15×10/° C. A glass-transition temperature Tgof the core glass is higher than a glass-transition temperature Tgof the clad glass. A core occupancy area ratio is 25% or more. A pixel density is 0.1 pixel/μmor more.