Sumitomo Electric Industries, Limited

Konishiroku Photo Industry Co., Ltd.

Hokushin Industries, Inc.

Hiroaki Ohta

Ichiro Tsuchiya

Kohei Kobayashi

Noriyoshi Tarumi

Toshio Danzuka

Yasuo Matsuda

Katsuya Nagayama

Kazuya Kuwahara

Katsuyuki Tsuneishi

Hiroshi Tsuchiya

Masakazu Kokiso

Hideo Miyaki

There is provided an optical fiber drawing furnace capable of drawing an optical fiber having small non circularity, which drawing furnace includes a muffle tube, in which an optical fiber preform is supplied, a heater surrounding the muffle tube, a plurality of electrode connecting portion extending from the heater, a plurality of electrodes connected to electrode connecting portions, and in conjunction therewith to an electric power source, and unifying means for unifying the temperature distribution along the circumferential direction.

Optical fiber drawing furnace with a zig zag heating element

Method and furnace for drawing optical fibers

An optical fiber preform manufacturing apparatus which continuously monitors the weight of a preform during manufacturing by a load cell without increasing the offset amount of the preform. The preform manufacturing apparatus includes a rotary chuck unit vertically moved by an elevating unit and a rod gripped by the rotary chuck unit and vertically extending downward. At the time of manufacturing a preform, the elevating unit and the rotary chuck unit are driven to rotate and move a starting rod suspended from the lower end of the rod upward. A support plate is fixed to the rotary chuck unit. Three or more load cells are arranged between the support plate and an elevating plate of the elevating unit. The rotary chuck unit is firmly supported by these load cells, so that the rotating shaft is not inclined. A hole is formed in the elevating plate, and the rotary chuck unit extends through the hole with a gap therebetween. A load by the support plate, the rotary chuck unit, the seed rod, a starting rod and the preform acts on the load cells. Therefore, the weight of the preform can be detected from an output from the load cells.

Optical fiber preform manufacturing apparatus which measures a vertical

An improved method of producing a thin-walled endless belt by centrifugal molding, which comprises introducing a liquid curable silicone rubber dissolved in a solvent into a rotating cylindrical mold, hardening said liquid curable silicone rubber to form a mold surface on the inner surface of said cylindrical mold, and thereafter introducing a thermosetting resin dissolved in a volatile solvent onto said mold surface to form the endless belt.

Method of producing thin-walled endless belt

Growing community of inventors

Yokohama, Japan

Hiroaki Ohta