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Process for producing drawn glass body

A technology of glass body and drawing body, applied in glass forming, glass remolding, manufacturing tools, etc., can solve the problem of reducing the accuracy of outer diameter and so on

Inactive Publication Date: 2009-09-23
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the outer diameter decreases, resulting in a decrease in the accuracy of the outer diameter after stretching

Method used

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  • Process for producing drawn glass body
  • Process for producing drawn glass body
  • Process for producing drawn glass body

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[0041] Next, a more detailed specific example will be described. In the first instance, using in this way figure 1 The drawing machine 1 is shown, that is, dummy rods are thermally bonded to each end of the glass body 20 and these dummy rods are held by holding members 11 and 12 . The glass body 20, mainly made of quartz glass, has a cylindrical shape for stretching, initially having a length of about 600 mm and an outer diameter of 30 mm. The target outer diameter D2(X) of the stretched glass body to be obtained was uniformly set to 10 mm regardless of X in the longitudinal direction.

[0042] An oxyhydrogen burner is used as the heating source 13, and the distance between the glass body 20 and the oxyhydrogen burner is set so that the amount of flame polishing caused by heating (the amount of the surrounding portion of the glass body scraped off by the oxyhydrogen flame) can be smaller. The diameter monitor 14 is arranged on the rear side of the heating source 13 with res...

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Abstract

A process for producing a drawn glass body through drawing of a columnar or cylindrical glass body with the use of a heating source moving in the longitudinal direction so as to have a desired outer diameter at each location. The process comprises the fist drawing step (1) of heating a glass body so as to soften the same, measuring the outer diameter of the softened area and drawing the glass body so that the measured value reaches a first control diameter greater than a target outer diameter, thereby obtaining an intermediate drawn body whose outer diameter at each location satisfies the relationship: (target outer diam. -10 [mu]m)<(outer diam. of intermediate drawn body)<(target outer diam. + 500 [mu]m), and the second drawing step (2) of heating the intermediate drawn body so as to soften the same, measuring the outer diameter of the softened area and drawing the intermediate drawn body so that the measured value reaches a second control diameter greater than the target outer diameter, thereby obtaining a drawn glass body with the target outer diameter.

Description

technical field [0001] The present invention relates to methods of making stretched glass bodies. Background technique [0002] An optical fiber manufactured by drawing an optical fiber preform has characteristics that depend on the refractive index profile along the radius of the preform. As the accuracy required for the characteristics of the optical fiber becomes higher, the accuracy required for the refractive index distribution of the optical fiber also becomes higher. Thus, in response to this demand, there has been a need for a method that can be used to manufacture an optical fiber preform having a desired refractive index profile. [0003] In addition, higher precision is required in the drawing process of the intermediate preform which is one step of the process of manufacturing an optical fiber preform. WO2004 / 000740 (Patent Document 1) discloses an invention for controlling the stretching ratio based on the outer diameter of the intermediate preform measured du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/012C03B23/047G02B6/00
CPCC03B23/047C03B37/01242C03B37/0124
Inventor 中西哲也菱仓良二
Owner SUMITOMO ELECTRIC IND LTD