Title:
APPARATUS AND METHOD FOR MANUFACTURING OPTICAL FIBER
Document Type and Number:
Japanese Patent JP2023147926
Kind Code:
A
Abstract:
To suppress the mixture of the air from a lower extension pipe in an optical fiber drawing furnace to suppress the reduction of the intensity of an obtained optical fiber.SOLUTION: An apparatus for manufacturing an optical fiber includes a drawing furnace for heating, melting and drawing an optical fiber preform to form a glass fiber. The drawing furnace includes: a heating furnace for heating and melting the optical fiber preform; a lower extension pipe provided in the lower end of the heating furnace and having a glass fiber passing through the inside; and a gas purge pipe provided in the lower end of the lower extension pipe and axially symmetrically injecting gas from the periphery to the glass fiber.SELECTED DRAWING: Figure 1
Inventors:
IZUMI YUJI
Application Number:
JP2022055712A
Publication Date:
October 13, 2023
Filing Date:
March 30, 2022
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES
International Classes:
C03B37/029
Attorney, Agent or Firm:
Patent Attorney Corporation Shinei Office