Patent ID: 6941772

Claim:
An apparatus for manufacturing a glass-base-material, which is a base material of an optical fiber, comprising: a driving unit that drives a glass rod around an axis of said glass rod said driving unit comprising a first section and a second section; a burner for accumulating glass soot around an outside surface of said glass rod, which is driven by said driving unit, to form said glass-base-material; a weight-deducting unit, on which said driving unit is mounted, for deducting a predetermined weight from a total weight of said driving unit and said glass-base-material formed by said burner, said 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, said first part mounting thereon said first section of said driving unit, and said second part mounting thereon said second section of said driving unit; and a counterweight mounted on said second part of said base; and a measuring unit provided under said weight-deducting unit for measuring said total weight, from which said predetermined weight is deducted by said weight-deducting unit.