Sumitomo Electric Industries, Limited

Kiminobu Yoshida

Hiroaki Takimoto

Kazuhisa Watanabe

Tetsuo Miyajiri

Akio Shiomi

Tamio Turita

A method for producing a glass preform for an optical fiber which comprises the steps of inserting a glass rod from one end of a glass tube while supplying a gas from the other end of the glass tube, flowing the gas through a clearance between the glass rod and the glass tube, exhausting the gas from said one end of the glass tube to outside of the glass tube, and heating and collapsing the glass tube on the glass rod to integrate them and to form the glass preform, which method yields a glass preform from which an optical fiber having improved strength and low attenuation of light is produced.

Method for producing glass preform for optical fiber

A gas supply apparatus for supplying gaseous raw material of an article to a processing apparatus, including at least one main vessel for storing liquid raw material of the article and supplying the gaseous raw material to the processing apparatus, an auxiliary vessel for storing liquid raw material replenishment for the liquid raw material, a main pipe for delivering the liquid raw material replenishment to the main vessel, a return pipe branched form the main pipe, first and second control valves, and a feed device for feeding, through the main pipe, the liquid raw material replenishment to the main vessel.

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Yokohama, Japan

Kiminobu Yoshida