Title:
MAGNESIA FIBER DRAW FURNACE
Document Type and Number:
Japanese Patent JP3236215
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a furnace for heating a glass rod to be used in a device for drawing an optical fiber from a glass preform, which has excellent stability in high temperature action and reduce grain contamination of the fiber by providing a specific constitution.
SOLUTION: In a furnace 20 to heat a glass rod, a zirconia susceptor tube 12 having an inner range to receive the glass rod, a cylinder type silica beaker 11 to limit the zirconia susceptor 12, and an insulation range comprising a magnesia grog 13 between the susceptor 12 and the silica beaker 11 are provided. In addition, favorably, a magnesia tube 14 to hold the magnesia grog 13 is provided between the magnesia grog 13 and the susceptor 12. In addition, an insulation layer 17 of alumino silicate is provided between the silica beaker 11 and the magaesia grog 13.
Inventors:
Frank vincent de marcelo
Arthur Clifford Hart, Junya
Richard Garner Huff
Karen S. Krantz
Arthur Clifford Hart, Junya
Richard Garner Huff
Karen S. Krantz
Application Number:
JP12210396A
Publication Date:
December 10, 2001
Filing Date:
May 17, 1996
Export Citation:
Assignee:
AT&T CORP.
International Classes:
C03B37/027; C03B37/029; F27B1/09; F27B9/36; F27D11/06; G02B6/00; H05B6/02; H05B6/14; H05B6/22; (IPC1-7): C03B37/027; F27B1/09; F27B9/36; F27D11/06; G02B6/00
Domestic Patent References:
| JP672736A | ||||
| JP6324237U |
Other References:
【文献】米国特許4547644(US,A)
Attorney, Agent or Firm:
Masao Okabe (10 outside)