Method for lengthening vitreous
A glass body and holding part technology, applied in glass molding, glass re-molding, glass manufacturing equipment, etc., can solve problems such as changes in the length direction, insufficient accuracy of intermediate preforms, and changes in refractive index structure.
Inactive Publication Date: 2008-11-05
SUMITOMO ELECTRIC IND LTD
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Problems solved by technology
[0003] However, there is a problem that the refractive index configuration changes in the axial direction during the manufacture of the optical fiber preform due to insufficient precision during the elongation of the intermediate preform
Therefore, there are cases where the internal refractive index configuration of the intermediate preform varies along the length even though the final outer diameter is precisely controlled
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[0024] The above and other features, aspects and advantages of the present invention will be better understood from the following description, appended claims and drawings. In describing the drawings, the same reference numerals are used for the same components, and repeated descriptions will be omitted.
[0025] FIG. 1 is a schematic conceptual diagram showing the overall configuration of an example of an elongating device used in the method of elongating a vitreous body of the present invention. FIG. 2 is a schematic conceptual diagram showing the configuration of the elongating device shown in FIG. 1 excluding the pyrometer and the diameter monitor, and shows an enlarged view of the configuration near the heated portion of the vitreous body and an outer diameter measurement position.
[0026] The glass body 20 to be elongated includes a substantially cylindrical core 21 and a cladding 22 surrounding the core 21 , wherein the refractive index of the core 21 and the cladding ...
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Abstract
A method of elongating a glass body is provided, in which method the axial variation in the inner refractive index structure of a glass body can be restrained. The method comprises: (1) heating and softening a glass body with a heating source that moves in the longitudinal direction while both ends of the glass body are held directly or indirectly by a first holder and a second holder, the first and second holders being distanced from each other; (2) obtaining a first outer-diameter measured value by measuring, with a first diameter monitor, the outer diameter of the core portion lying in the range where the outer diameter of the core portion is decreasing as a result of softening of the glass body; (3) determining the distancing speed of the first and second holders and / or the moving speed of the heating source according to the first outer diameter measured value so that the post-elongation outer diameter of the core portion may become a desired value; (4) and moving the first holder or the second holder and / or moving the heating source so as to elongate the glass body according to the speed thus determined.
Description
technical field [0001] The present invention relates to methods for elongating the vitreous. Background technique [0002] An optical fiber produced by drawing an optical fiber preform has properties that depend on the radial refractive index profile. The higher the requirements for the accuracy of this characteristic of the fiber, the higher the requirements for the accuracy of the refractive index profile of the fiber. In order to meet this requirement, people try to develop a method that can accurately manufacture optical fiber preforms with the desired refractive index profile. [0003] However, there is a problem that the refractive index configuration changes in the axial direction during the manufacture of the optical fiber preform due to insufficient precision in the elongation of the intermediate preform. Unexamined International Patent Application WO-2004-000740 discloses a method aimed at solving said problem. According to the disclosed method, the outer diamet...
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IPC IPC(8): C03B23/047
CPCG01B11/12C03B37/0124C03B37/01242G01N21/412
Inventor 中西哲也
Owner SUMITOMO ELECTRIC IND LTD