Shin-etsu Chemical Co., Ltd.

Shin-etsu Chemical C O., Ltd.

Mitsukuni Sakashita

Waichi Yamamura

Tadakatsu Shimada

Hideo Hirasawa

Masataka Watanabe

Yoshiaki Shimizu

Jiro Moriya

Kazuhisa Hatayama

Minoru Taya

Shinji Suzuki

Takaaki Nagano

Soichiro Kemmochi

Shoji Hoshino

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

A method for manufacturing an optical fiber comprises setting a heating condition for heating a glass rod, which is a parent material of the optical fiber, and an elongating speed of the glass rod based on a prescribed numerical value which changes with a progress of elongation of the glass rod; heating and elongating the glass rod to generate a preform based on the heating condition and the elongating speed which are set by the setting; and drawing the preform to a filament-like form by further heating the preform to generate the optical fiber.

Optical fiber manufacture method, preform manufacture method, and preform manufacture apparatus

Method of making an optical fiber preform where a second elongation is based on a mark on a glass rod

A method for manufacturing a glass rod ( ), which is a parent material of an optical fiber ( ), comprising: adjusting a vertical inclination of a standard rod ( ) having a predetermined straightness; and heating and elongating a base material ( ), which is a parent material of the glass rod ( ), along an axis of the standard rod ( ), the vertical inclination of which is adjusted, to generate the glass rod ( ).

Straightening a glass rod for use in making an optical fiber preform

The glass base material drawing apparatus for heating and drawing a glass base material has a storage unit for storing the glass base material having an opening unit that is opened along the longitudinal direction of the storage unit when the glass base material is placed inside the storage unit, a heating unit for heating the glass base material that has been stored inside the storage unit via the opening unit, and a pull-out unit for pulling out the glass base material heated by the heating unit. The opening unit may be opened in such a manner that the glass base material is moved from a side direction of the storage unit into the interior of the storage unit. A main axis for supporting the glass base material is connected to the glass base material. The storage unit may have a penetration hole through which the main axis is inserted when the opening unit is closed.

Glass base material drawing apparatus and method for drawing glass base material

Optical fiber manufacture method including elongating a preform in a vertical direction and a horizontal direction

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Annaka, Japan

Mitsukuni Sakashita