Title:
OPTICAL FIBER DRAWING METHOD
Document Type and Number:
Japanese Patent JP3519750
Kind Code:
B2
Abstract:
PURPOSE: To draw a high-quality optical fiber having high strength, low transmission loss, etc., even when a large-diameter perform of optical glass fiber is drawn at a high speed.
CONSTITUTION: When a carbon electric furnace 2 (drawing furnace) is used, the ratio of gaseous argon having a low heat-transfer coefficient to gaseous helium having a high heat-transfer coefficient in the gaseous mixture determined by the outer diameter and drawing speed of an optical fiber glass perform 8 is set in the gaseous argon feed controller 24 and gaseous helium feed controller 26 through an input controller 28. The gaseous mixture having a specified heat-transfer coefficient is formed in a mixer 22 and introduced into the furnace 2. The temp. of molten preform 8 is appropriately controlled at its meniscus by the heat-transfer coefficient of the gaseous mixture introduced into the furnace 2, and an optical fiber 10 is drawn while maintaining a specified length of the solidified part and an appropriate drawing tension.
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Inventors:
Orita, Nobuaki
Tokuoka, Yoko
Koaizawa, Hisashi
Kamiya, Tamotsu
Tokuoka, Yoko
Koaizawa, Hisashi
Kamiya, Tamotsu
Application Number:
JP663893A
Publication Date:
April 19, 2004
Filing Date:
January 19, 1993
Export Citation:
Assignee:
FURUKAWA ELECTRIC CO LTD:THE
International Classes:
C03B37/027; C03B37/025; G02B6/00; (IPC1-7): C03B37/027; G02B6/00
Attorney, Agent or Firm:
佐藤 隆久
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