Methods of and apparatus for collapsing a preform tube into a preform from which lightguide fiber is drawn
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United States of America Patent
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Dec 4, 1984
Grant Date -
N/A
app pub date -
Dec 8, 1983
filing date -
Dec 8, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A lightguide fiber preform is made by depositing optically suitable layers of doped silicon dioxide on an inner wall of a rotating glass substrate tube (31) which is exposed to a moving zone of heat during a deposition mode and during a mode when the tube is collapsed. During each of a plurality of passes of a torch assembly (50) in the collapse mode following deposition, a contact device (101) is in continuous engagement with the tube and is caused to apply forces to each successive increment of its length following exposure to at least an initial portion of the zone of heat to collapse incrementally the tube. Between successive ones of the plurality of passes, the contact device is moved inwardly of the tube so that each increment of length is exposed to forces which as between the successive passes are applied at points incrementally closer to the longitudinal axis (36) of the tube.
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