发明名称 PRODUCTION OPTICAL FIBER PREFORM
摘要 <p>PROBLEM TO BE SOLVED: To surely prevent both the occurrence of foam and the eccentricity of core in the production of an optical fiber preform by simultaneously carrying out the integration of a glass pipe with a glass rod and drawing. SOLUTION: A core or the core and the glass rod 2 for a clad are inserted into a glass pipe 1 for the clad. The inside of the glass pipe is evacuated while heating both the glass pipe and the glass rod by a heater 3 and the integration of the glass pipe 1 with the glass rod 2 and drawing are simultaneously carried out. After either or both of the glass pipe 1 and the glass rod 2 are drawn, the glass pipe 1 is integrated with the glass rod 2 and the integrated glass pipe and glass rod are drawn until the outer diameter of the glass pipe reaches a fixed diameter D2. Especially the integration of the glass rod and the glass pipe and the drawing are performed so as to make the formula 0.1<=L1/(L1+L2)<=0.8.</p>
申请公布号 JP2001010836(A) 申请公布日期 2001.01.16
申请号 JP19990174954 申请日期 1999.06.22
申请人 MITSUBISHI CABLE IND LTD 发明人 ITO HIDEAKI;KINOSHITA TAKAAKI;KIN MASATAKA;NAGAE NOBUSADA
分类号 C03B37/012;G02B6/00;(IPC1-7):C03B37/012 主分类号 C03B37/012
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