发明名称 |
OPTICAL FIBER DRAWING METHOD AND OPTICAL FIBER DRAWING APPARATUS |
摘要 |
Capacity of space in a drawing furnace is decreased so as to reduce variations in pressure in the furnace and also the side of an insertion port of a glass perform is stably sealed. When drawing is started, an outer peripheral surface of the optical fiber glass preform 11 is sealed with a first seal part 17 of the seal mechanism. After a vicinity of a taper part of the optical fiber glass preform 11 starts to pass through the first seal part 17, switching to a second seal part 18 arranged above the first seal part 17 is performed, and an outer peripheral surface of a sleeve member 20 fixed so as to surround an outer periphery of the dummy rod 12 is sealed with the second seal part 18. |
申请公布号 |
US2016002090(A1) |
申请公布日期 |
2016.01.07 |
申请号 |
US201414769827 |
申请日期 |
2014.02.18 |
申请人 |
SUMITOMO ELECTRIC INDUSTRIES, LTD. |
发明人 |
OKAZAKI Iwao;YAMAZAKI Takashi;KONISHI Tatsuya;TSUNEISHI Katsuyuki |
分类号 |
C03B37/027;C03B37/029 |
主分类号 |
C03B37/027 |
代理机构 |
|
代理人 |
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主权项 |
1. An optical fiber drawing method for drawing an optical fiber by joining an optical fiber glass preform to a dummy rod and hanging and downwardly moving the optical fiber glass preform inside a drawing furnace while sealing with a seal mechanism of an upper part of the drawing furnace, comprising:
when drawing is started, sealing an outer peripheral surface of the optical fiber glass preform with a first seal part of the seal mechanism; and after a vicinity of a taper part of the optical fiber glass preform starts to pass through the first seal part, performing switching to a second seal part arranged above the first seal part, and sealing an outer peripheral surface of a sleeve member fixed so as to surround an outer periphery of the dummy rod with the second seal part. |
地址 |
Osaka-shi, Osaka JP |