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Glass matrix, method for producing the same and method for producing optical fiber

A manufacturing method and glass technology, applied in glass manufacturing equipment, glass fiber drawing equipment, manufacturing tools, etc., can solve the problems of increased manufacturing cost, waste disposal, etc., and achieve the effect of improving yield rate, shortening scope, and reducing manufacturing cost

Active Publication Date: 2011-09-14
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The fiber at the abnormal portion at the beginning of drawing cannot be used as a product due to eccentricity, etc., and it will be discarded.
If the number of discarded optical fibers increases, the manufacturing cost will increase as the yield rate decreases

Method used

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  • Glass matrix, method for producing the same and method for producing optical fiber
  • Glass matrix, method for producing the same and method for producing optical fiber
  • Glass matrix, method for producing the same and method for producing optical fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] like figure 1 As shown, a glass base material with an average outer diameter of φ62 mm and a length of 1100 mm having a mechanically cut surface 2 at both ends is installed on a glass lathe with a shape measuring device, and the centerline displacement of the glass base material is measured. If the displacement of the centerline of the melting point of the shaped part exceeds 2.6 mm, the glass base material is rotated and heated and softened with a burner flame to correct the displacement of the centerline to 2.6 mm or less. Then, it is fused at the above-mentioned fusing place to form a Image 6 The fusing taper shown serves as the glass base material for the wire.

[0078] In this glass base material for wire drawing, the outer diameter is 0.98×D M = 60.8mm The end of the straight body and the outer diameter of the tapered part become the centerline displacement between the inclined evaluation ends of φ20mm, that is, the inclination of the tapered part is extremely ...

Embodiment 2

[0080] Several types of glass base materials with different outer diameters are prepared, and the tapered parts are formed by fusing for drawing. At this time, the relationship between the inclination δ of the tapered portion and the outer diameter D of the glass base material δ / D and the length of the drawn optical fiber is as follows: Figure 10 shown. The approximate straight line 25 in the figure is obtained by the least square approximation calculation for the axis points in the range of δ / D≧0.035. Depend on Figure 10 It can be confirmed that in the range of δ / D≦0.03, there is almost no change in overlength, which becomes extremely small.

[0081] Using the glass base material obtained by the manufacturing method of the present invention can effectively reduce the manufacturing cost of the optical fiber.

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Abstract

When a tapered part is formed at the end part of a glass matrix for producing an optical fiber, the center line displacement of a fused part from the center line of the glass matrix is corrected below a specified numeric value, and the tapered part is formed by fusing the glass matrix at the corrected part. In a drawing glass matrix having a straight body effective part of average outside diameter D and a tapered part at one end thereof, a relation of delta / D<=0.03 is satisfied between a distortion delta of the tapered part represented by the maximum center line displacement of the glass matrix between the straight body effective part end near the tapered part and the distortion evaluating end of the tapered part, and the average outside diameter D when the glass matrix is attached to a drawing machine. Consequently, the eccentricity of the optical fiber is reduced quickly at the initial stage of drawing and the excess length is decreased.

Description

technical field [0001] The present invention relates to a glass base material for producing optical fiber, its production method and the production method of optical fiber, especially relates to a production method of glass base material having an end shape suitable for the pull wire of optical fiber, and A glass base material thus obtained, and a method of manufacturing an optical fiber using the glass base material. [0002] In addition, the contents of the designated countries that are determined to be incorporated based on the referenced documents are incorporated into the present application by referring to the contents disclosed in the following applications as a part of the disclosure of the present application. [0003] Japanese Patent Application No. 2004-159822 (application date: May 28, 2004) [0004] Japanese Patent Application No. 2004-159848 (application date: May 28, 2004) Background technique [0005] The large glass base material is heated in a heating fur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/012C03B33/085C03B37/027
CPCC03B37/02772C03B2205/47C03B37/01251C03B2205/46Y02P40/57C03B37/012C03B33/085
Inventor 坂下光邦
Owner SHIN ETSU CHEM CO LTD