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US 2002/0116956 A1Published application
Method for producing quartz glass preform for optical fibers
OwnerYasushi Fukunaga, Masanori Suzukiinventors
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OwnerYasushi Fukunaga, Masanori Suzukiinventors
Estimating the term…
A method for producing a large quartz glass preform for optical fibers having a low ellipticity at a low cost is provided. The method comprises a heating and stretching of a large quartz glass cylinder or a preform in which a core rod is inserted in said quartz glass cylinder without being integrated with the cylinder in non-contact state, using a heating furnace equipped with a carbon-made heating element, whereby setting the ratio (d/D) of the outer diameter (D) of the large quartz glass cylinder and the inner diameter (d) of the heating element to a range of from 1.02 to 1.5, and blowing in an inert gas from the upper part of the heating furnace (FIG. 1)
A method for producing a quartz glass preform for optical fibers by heating and stretching a quartz glass cylinder having an outer diameter (D) using a heating furnace having an upper part and a lower part and being equipped with a carbon-made heating element with an inner diameter (d), characterized by setting the ratio (d/D) to the range of from 1.02 to 1.5, and blowing in an inert gas from the upper part of the heating furnace into the heating element.
A method for producing a quartz glass preform for optical fibers, said method comprising:
Dependencies are inferred from the claim text.