Patent ID: 6988382
Filing Date: 2006-01-24
Classification: C03B

Abstract:
1. A method for manufacturing a glass-base-material, which is a base material of an optical fiber, comprising: driving a glass rod using a driving unit; accumulating glass soot around an outside surface of said glass rod driven by said material and said driving unit; deducting a predetermined weight from a total weight of said glass-base-material and said driving unit; measuring said total weight, from which said predetermined weight is deducted by said deducting; and controlling a rate of increase in weight of said glass-base-material based on said total weight measured by said measuring, wherein said deducting said predetermined weight comprises using a weight deducting unit comprising a base supported by a supporting member, said base comprising a first part and a second part opposite to said first part with respect to said supporting member, and a counterweight mounted on said second part of said base, and said driving unit comprising a first section mounted on said first part and a second section mounted on said second part.