发明名称 |
Furnace for forming optical fiber |
摘要 |
An optical fiber drawing furnace capable of the prevention of entry of an ambient gas into an inner space thereof both effectively and economically, provided with a lower gas introduction portion through which inert gas is introduced into the inner space of the optical fiber drawing furnace, a chamber separated by a lower partition, and a bottom cover. The lower partition is arranged immediately below the lower gas introduction portion and has a first hole through which the chamber and the inner space are communicated. The bottom cover has a second hole through which the chamber and the atmosphere are communicated. An optical fiber is passed through the first and second holes. A controller detects a differential pressure between a pressure P1 in the inner space and a pressure P2 in the chamber and controls the suction flow by a pump for evacuating the gas in the chamber to maintain P1>P2. The sizes of the first and second holes are defined as (L1/D1)<(L2/D2), where L1 and L2 are lengths of the holes and D1 and D2 are the diameters of the holes.
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申请公布号 |
US6192715(B1) |
申请公布日期 |
2001.02.27 |
申请号 |
US19990245340 |
申请日期 |
1999.02.05 |
申请人 |
THE FURUKAWA ELECTRIC CO., LTD. |
发明人 |
ORITA NOBUAKI;KUMADA TETSUYA;SAKATA YOSHIYUKI;KOAIZAWA HISASHI |
分类号 |
G02B6/00;C03B37/027;C03B37/029;(IPC1-7):C03B37/07 |
主分类号 |
G02B6/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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