초록 ▼

A device for drawing down an optical fiber preform (2) connected at one end to a feed rod (3) having an equal or smaller diameter. A chamber (11) in which the preform is drawn has an upper part (11A) with an opening (12). The opening engages the preform to seal the chamber. An enclosure (5) has a se

A device for drawing down an optical fiber preform (2) connected at one end to a feed rod (3) having an equal or smaller diameter. A chamber (11) in which the preform is drawn has an upper part (11A) with an opening (12). The opening engages the preform to seal the chamber. An enclosure (5) has a seal (6) at its upper part (5A) for sealing around the feed rod. A lower part (5B) of the enclosure contacts the upper part of the chamber to seal the chamber while the feed rod is passing through the opening.

대표청구항 ▼

[ We claim:] [1.] A system comprising an optical fiber perform and a device for drawing down an optical fiber preform, the preform having an upper end and a lower end, the preform being connected to a feed rod at the upper end, the lower end being a free end of the preform, the feed rod having a dia

[ We claim:] [1.] A system comprising an optical fiber perform and a device for drawing down an optical fiber preform, the preform having an upper end and a lower end, the preform being connected to a feed rod at the upper end, the lower end being a free end of the preform, the feed rod having a diameter equal to or smaller than a diameter of the preform, said device comprising:a drawing chamber in which the preform is drawn down, the drawing chamber having an upper part with an opening, the opening engaging the preform to seal the drawing chamber, and a lower part through which a drawn preform emerges; andan enclosure sealably and slidingly engaged with said feed rod, said enclosure being carried by the feed rod and being positioned to seal the drawing chamber while the feed rod passes therethrough.