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US 5,210,391 AGranted
Apparatus for manufacturing metal tube covered optical fiber cable and method therefor
AssigneeNKK Corporation
InventorsYasunori Yoshie, Takashi Tsukui
Life of this patent
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AssigneeNKK Corporation
InventorsYasunori Yoshie, Takashi Tsukui
Estimating the term…
An apparatus for manufacturing a metal tube covered optical fiber cable comprises an assembly of a plurality of roller pairs for forming a metal strip into a metal tube so that both side edge portions abut against each other, a laser (7) for welding the abutment portions with a laser beam to obtain a sealed metal tube (1c), an optical fiber guide for guiding an optical fiber (5) into the formed metal tube (1a), and a traction apparatus including a tension variable elements for continuously drawing a sealed metal tube (1d). The optical fiber guide is elastically urged against an inner wall opposite to an irradiated surface of the metal tube so that the optical fiber is protected even when the focal point of the laser beam is positioned below the abutment portions of the metal tube. In one embodiment a leaf spring mechanism is used to elastically urge the optical fiber guide.
An apparatus for manufacturing a metal tube covered optical fiber cable, comprising:
An apparatus for manufacturing a metal tube covered optical fiber cable, comprising:
An apparatus for welding a metal tube by laser radiation, wherein a metal strip substantially in the shape of a cylinder and having a longitudinal gap between longitudinal side edge portions thereof is subjected to traction, said apparatus comprising:
A method of manufacturing a metal tube covered optical fiber cable, comprising the steps of forming a metal strip which is to be sealed to form a metal tube, and guiding at least one optical fiber into said metal tube, wherein the optical fiber is guided into said metal tube through a guide tube which is inserted into said metal tube and which is elastically urged against an inner wall surface of said metal tube at a position opposite to a welding surface.
A method of manufacturing a metal tube covered optical fiber cable, comprising the steps of:
A metal tube covered optical fiber cable comprising at least one optical fiber that is covered by a metal tube, formed from a metal strip that is substantially in the shape of a cylinder and whose unsealed portion is sealed by welding, said sealed metal tube covered optical fiber cable having a rear bead width b in .mu.m within the range of
Dependencies are inferred from the claim text.