Optical fiber draw furnace and an optical fiber drawing method

摘要

Is to provide a method of drawing and optical fiber draw furnace was small [summary] wire diameter variation of the drawing when the [challenge] optical fiber preform. Equipped with a cylindrical tube 6 Of which connects at its upper end with [MEANS FOR SOLVING PROBLEMS] core tube 5, the dummy bar an optical fiber preform 1 was supported by a dummy rod 3 the top inside of the inner tube 6 and the furnace heart tube 5 optical fiber is positioned so as to be lowered with 3, and was heated and melted by the heater 10 from the outside of the core tube 5 through the optical fiber preform 1, draw an optical fiber 2 from the lower end of the optical fiber preform 1 A drawing furnace, the inner cylindrical tube 6 and the dummy rod 3 Partition plate 1 of insulating material which divides up and down the space between the It is as it was arranged to drop along with the three dummy bar in the vicinity of the lower end of the dummy rod 3 1.