C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
49/8.8
C03B 37/025 (2006.01) C03B 37/029 (2006.01)
Patent
CA 2011153
A drawing furnace for an optical fiber comprises a member in which a preform for the optical fiber is accommodated, a muffle tube connected to the accommodating member, around which a heater is disposed and in which a tip portion of the preform is heated and melted. Inert purging gas is supplied to the muffle tube or to both the accommodating member and the muffle tube. The invention is characterized in that at least a portion of at least one of the muffle tube and the accommodating member comprises at least two furnace walls defining a space between them. The outermost wall has an inlet through which the purging gas is supplied to the space, and the innermost wall has an outlet through which the purging gas leaves the space after flowing between the walls.
our d'étirage de fibre optique comportant une section dans laquelle on installe une préforme, un tube de vitrification relié à cette section, autour duquel se trouve un appareil de chauffage et dans lequel on fait chauffer et fondre une extrémité de la préforme. On fournit un apport de gaz rare purgeur dans le tube de vitrification ou simultanément dans la section qui reçoit la préforme et le tube de vitrification. Cette invention se distingue en tant qu'au moins une partie d'au moins l'un des tubes de vitrification et la section servant à contenir la préforme comprennent au moins deux parois de four définissant un espace intercalaire. La paroi extérieure présente un orifice par lequel le gaz purgeur sort de l'espace intercalaire après avoir circulé entre les parois.
Matsuda Yasuo
Takagi Masahiro
Yoshimura Ichiro
Kirby Eades Gale Baker
Sumitomo Electric Industries Ltd.
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