Shin-etsu Chemical Co., Ltd.

Shin-etsu Chemical C O., Ltd.

Soichiro Kemmochi

Tadakatsu Shimada

Waichi Yamamura

Hideo Hirasawa

Takaaki Nagao

Mitsukuni Sakashita

Takaaki Nacao

The method, in which base material ingotis heated and softened in an electric furnace, drawn with a pair of pinch rollerand, and elongated to make base material rodhaving a smaller diameter than the ingot, features: forming either a roller groovehaving a curvature radius which is larger than the outer diameter of the base material rodor a V-shaped roller groovehaving the cross section consisting of straight lines on the surface of the pinch rollermade of metal; nipping with the facing roller groovesandrespectively formed on the surfaces of a pair of said pinch rollersand; and drawing said base material rod.

Method of elongating optical fiber base material, and apparatus for elongating the same

There is provided an elongation method of an optical fiber base material, by which a base material rod not requiring a process for modifying a bend from base material ingot is obtained. The method for elongating base material ingot to be a base material rod having a diameter smaller than before to manufacture an optical fiber base material, includes the steps of: elongating the base material ingot while controlling a control position so that a neck-down within a horizontal surface of the base material ingot is located at a target position; measuring a bending direction and a bending amount of an elongated base material rod; and adjusting the target position based on the result. In addition, it is preferable to adjust a position of a pendant portion of base material ingot in order to control the position of the neck-down to be the target position. For example, the position of the pendant portion may be moved in an XY direction, more particularly, in a direction in which the measured bend shows convexity.

Method of elongating an optical fiber base material

A method for drawing a glass ingot comprises holding a vertically suspended glass ingot,at an upper end thereof, passing the ingot through a heating furnace,having upper and lower openings, and drawing the glass ingot while moving one end or both ends thereof, wherein a plurality of heating means,are provided along vertical directions in the heating furnace,, and the temperatures of the respective heating means,are individually control to control a temperature distribution within the heating furnace

Apparatus and method for drawing a glass ingot

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Tokyo, Japan

Soichiro Kemmochi