发明名称 |
Method of elongating glass preform |
摘要 |
In a method of elongating a glass preform comprising the steps of holding both ends of the glass preform 1a with a first holding section 2 and a second holding section 3, respectively; moving the first holding section 2 and the second holding section 3 in a longitudinal direction of the glass preform 1a with the moving speed of the first holding section 2 faster than that of the second holding section 3 and, at the same time, heating and softening the glass preform 1a by a heating section 4 successively; and elongating the glass preform 1a by a tensile force applied thereto, so as to form an elongated body 1c; an electric furnace is employed in the heating section 4; and said method further comprising the steps of setting a reference value R1 with respect to an outside diameter at a specific position 1d in a tapered region 1b in the glass preform 1a in the process of elongating; acquiring an actually measured value R2 at the specific position 1d; and controlling the moving speed of the first holding section 2 and/or second holding section 3 according to a value (R2/R1) obtained from the reference value R1 and actually measured value R2.
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申请公布号 |
US6438997(B1) |
申请公布日期 |
2002.08.27 |
申请号 |
US20000535531 |
申请日期 |
2000.03.27 |
申请人 |
SUMITOMO ELECTRIC INDUSTRIES, LTD. |
发明人 |
SAITO TATSUHIKO;MORIYA TOMOMI |
分类号 |
C03B37/012;G05D5/00;(IPC1-7):C03B37/07 |
主分类号 |
C03B37/012 |
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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