Patent ID: 7055345
Filing Date: 2006-06-06
Classification: C03B,Y02P

Abstract:
1. A method for manufacturing a glass base material, suitable for use as a base material of an optical fiber, comprising: rotating a base rod within a chamber, around and along which said glass base material is to be formed; hydrolyzing with at least one burner a gas material to generate glass particles and form said glass base material; accumulating said glass particles, around and along said base rod; said accumulating including moving said at least one burner with a burner moving unit, according to a first cycle, in a moving direction parallel to a longitudinal direction of said base rod, and moving said burner moving unit, according to a second cycle, also in a moving direction parallel to a longitudinal direction of said base rod; and regulating an airflow rate of an airflow flowing through said chamber that accommodates said base rod, said glass material, and said at least one burner, said regulating including controlling a total opening area of a first vent plate of a main duct provided on said chamber, a second vent plate of a side duct associated with said chamber, and a plurality of air holes provided on a bottom of said chamber, said main duct extending substantially along a whole length of said chamber along said longitudinal direction of said base rod, said first and second vent plates including a plurality of vents provided substantially along said whole length of said chamber, and said side duct facing an outlet of said at least one burner across said base rod and extending substantially along said whole length of said chamber along said longitudinal direction of said rod.