Sumitomo Electric Industries, Limited

Nobuyuki Taira

Masaaki Hirano

Tetsuya Nakanishi

Masashi Onishi

Tomoyuki Yokokawa

Shinji Ishikawa

Tetsuya Haruna

Toshiki Taru

Tetsutarou Katayama

In a glass processing method according to the invention, in the case of performing chemical vapor deposition or diameter shrinkage of a substrate glass tube G by relatively moving a heating furnacecomprising a heating elementfor annularly enclosing the circumference of the substrate glass tube in a longitudinal direction of the substrate glass tube G with respect to the substrate glass tube G in which an outer diameter is 30 mm or more and a wall thickness is 3 mm or more and is less than 15 mm and an ovality of the outer diameter is 1.0% or less using a glass processing apparatus, a temperature of at least one of the heating elementand the substrate glass tube G is measured and the amount of heat generation of the heating elementis adjusted based on the measured temperature.

Glass tube processing apparatus

Glass tube processing method

Glass tube processing method, apparatus and glass tube

A method produces a glass body that contains a reduced amount of OH groups in the metallic-oxide-containing glass layer and that has a reduced amount of transmission loss due to OH groups when the glass body is transformed into an optical fiber. The production method produces an optical glass body. An optical fiber contains the optical glass body in at least one part of its region for guiding a lightwave. The production method includes the following steps: (a) introducing into a glass pipe a gas containing an organometallic compound and a glass-forming material; (b) decomposing the organometallic compound into an organic constituent and a metallic constituent; (c) heating and oxidizing the metallic constituent so that produced glass particles containing a metallic oxide are deposited on the inner surface of the glass pipe to form a glass-particle-deposited layer; and (d) consolidating the deposited layer to form a metallic-oxide-containing glass layer.

Glass-body-producing method and optical glass body and optical fiber

Growing community of inventors

Kanagawa, Japan

Nobuyuki Taira