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Method of manufacturing glass preform

A technology for glass preforms and glass particles, which is used in glass molding, manufacturing tools, glass deposition furnaces, etc., and can solve the problems of unstable core diameter, cladding outer diameter and core refractive index.

Active Publication Date: 2012-07-11
SUMITOMO ELECTRIC IND LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the core diameter, cladding outer diameter, and core refractive index can become unstable within a batch or between batches

Method used

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  • Method of manufacturing glass preform
  • Method of manufacturing glass preform
  • Method of manufacturing glass preform

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[0046] While monitoring the deposition shape with the CCD camera 21 installed corresponding to the lower portion of the reaction vessel 11, the deposition operation of the glass microparticles is performed at a pull-up rate corresponding to the growth rate of the end portion (refer to figure 1 ). The respective outer diameters D1, D2 of the cylindrical portions 26, 28 and the taper angle θ of the tapered portion 27 are calculated from the photographed deposition shape, and the flow rates of the respective raw material gases, the flow rates of the flame forming gases, and the burner positions are controlled, thereby The parameters can be limited within the allowable range (outer diameter D1 = 30mm to 35mm, outer diameter D2 = 150mm to 180mm and cone angle θ = 30 degrees to 40 degrees, refer to figure 2 ), so that the parameters can be made close to the target shape (outer diameter DO1 = 32.5mm, outer diameter DO2 = 165mm and cone angle θO = 35 degrees). In the event that all ...

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Abstract

The invention discloses a method of manufacturing glass perform, including: obtaining a glass-fine-particle deposit by a VAD process; and heating the obtained glass-fine-particle deposit at a high temperature, thereby manufacturing a transparent glass preform, wherein, while depositing glass fine particles, in addition to monitoring a deposition shape of the glass-fine-particle deposit and controlling a pull-up rate of the glass-fine-particle deposit, there is controlled at least any of: flow rates of glass starting gases to be charged into glass-fine-particle producing burners; flow rates of flame forming gases to be charged into the glass-fine-particle producing burners; and positions of the glass-fine-particle producing burners relative to the glass-fine-particle deposit, so that the deposition shape may become a target shape, and wherein the deposition of the glass fine particles is stopped in a case where the deposition shape deviates from the target shape.

Description

technical field [0001] The invention relates to a method of manufacturing a glass preform by depositing glass particles according to a VAD process to produce a glass particle deposit. Background technique [0002] In the VAD process of manufacturing glass preforms for optical fibers, glass particles are deposited to form glass particle deposits. In combination with this method, it is proposed to use a CCD camera to monitor the end portion of the glass particle deposit, and to control the pull-up rate, the amount of raw material gas charged, or the position of the burner so that the end position of the deposit is at a predetermined position, or according to the end position Changes in position control the pull-up rate, feed gas charge, or burner position (for example, JP-2006-193360-A, JP-H08-198634-A, JP-2000-281378-A, and JP-H08-A 034632-A). [0003] For the manufacture of porous preforms by the VAD process using three burners, it is also proposed to monitor the shape of ...

Claims

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Application Information

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IPC IPC(8): C03B19/14
CPCC03B37/0142C03B2207/70C03B2207/60C03B37/014
Inventor 石原朋浩伊藤辉彦
Owner SUMITOMO ELECTRIC IND LTD
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