DEVICE AND METHOD FOR MANUFACTURING AN OPTICAL PREFORM
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United States of America Patent
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Issued Date -
Dec 20, 2012
app pub date -
Jun 15, 2012
filing date -
Jun 17, 2011
priority date (Note) -
Abandoned
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Abstract
A device for contracting a hollow substrate tube made of quartz glass into an optical perform including a heat source movable relative to the longitudinal direction of the substrate tube and an insert tube positioned in the interior of the substrate tube, at one end thereof, provided with a central opening through which a gas is passed and supplied to the interior of the substrate tube.
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