Title:
METHOD FOR MANUFACTURING POROUS GLASS BASE MATERIAL FOR OPTICAL FIBER
Document Type and Number:
WIPO Patent Application WO/2016/159220
Kind Code:
A1
Abstract:
This method for manufacturing a porous glass base material for optical fibers involves: supplying, while moving a target rod and a burner for glass fine particle synthesis back and forth relative to each other, a glass material gas and a combustion gas to the burner to deposit the synthesized glass fine particles on the outer circumference of the target rod. When synthesizing a glass fine particle deposition layer at a portion where 0.5L≤R≤0.8L (L [mm] represents the final outer diameter of the porous glass base material for optical fibers to be manufactured, and R [mm] represents the outer diameter of the glass fine particle deposition in mid-course of manufacturing) is satisfied, V (V [mm/min.] represents a relative movement speed of the target rod and the burner) and r (r [rpm] represents the rotation rate of the target rod) are gradually reduced while the fluctuation of a sweep pitch P [mm] of the burner represented by V/r is kept within a range of ±10% of the central value.
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Inventors:
NAKAJIMA MASAKI (JP)
SHINADA SEIICHI (JP)
SHINADA SEIICHI (JP)
Application Number:
PCT/JP2016/060634
Publication Date:
October 06, 2016
Filing Date:
March 31, 2016
Export Citation:
Assignee:
FURUKAWA ELECTRIC CO LTD (JP)
International Classes:
C03B37/018
Foreign References:
| JP2007106616A | 2007-04-26 | |||
| JP2006199526A | 2006-08-03 | |||
| JP2005139042A | 2005-06-02 | |||
| JPH09118539A | 1997-05-06 | |||
| JP2001233634A | 2001-08-28 |
Other References:
See also references of EP 3279155A4
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
Patent business corporation Sakai international patent firm (JP)
Patent business corporation Sakai international patent firm (JP)
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