公开(公告)号：EP1306354A4

公开(公告)日：2005-03-30

申请号：EP01921810

申请日：2001-04-11

申请人： SHINETSU QUARTZ PROD ,  TOYO TANSO CO

发明人： KUSANO YOSHIHISA ,  SHIMADA ATSUYUKI ,  HIRAOKA TOSHIHARU

IPC分类号： C03B8/04 ,  C03B19/02 ,  C03B19/09 ,  C03B19/14 ,  C03B37/012 ,  C03B37/014 ,  C03B37/027 ,  C03B37/018 ,  G02B6/00

CPC分类号： C03B19/02 ,  C03B19/1484 ,  C03B37/0126 ,  C03B37/01268 ,  C03B37/0128 ,  C03B37/01486 ,  C03B37/02736

摘要： A mandrel for producing quartz glass, comprising at least two columnar or cylindrical, carbon fiber-reinforced, carbon composite material-made members joined in series by screw units. The mandrel is carbon-impregnated and/or carbon-coated on the screw units, and, in addition, may be provided with reinforcing members on the outer sides of the screw portions. Quartz glass fine particles obtained by flame-hydrolyzing a volatile silicon compound are deposited, using this mandrel, on the surface of a heat-resisting base or on a pilot rod at the end of the mandrel to easily form a large porous quartz glass matrix, the glass matrix is dehydrated and transparently vitrified to produce a large optical fiber matrix, and further the optical fiber matrix is drawn to produce a low-cost, high-precision optical fiber. In addition, a columnar or cylindrical mandrel for producing quartz glass is disposed at the center of a heat-resisting mold, is filled with silicon dioxide powder, and melted in a heating furnace for vitrifying, thereby producing a large, high-precision quartz glass element at low costs.