Optical fiber manufacturing method, optical fiber and endoscope
AssigneeOlympus Corporation
InventorsMakoto Tanabe, Hiroki Takagi
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Abstract
Provided is a method for manufacturing an optical fiber that is inserted into an insertion portion of an endoscope and guides light, wherein inside an upright fiber drawing furnace, inside a hollow clad tube including a clad glass having a viscosity η1 of 5.0<Log η1<7.0 at a temperature at which a viscosity η2 of a core glass becomes Log η2=3.5, the core glass in a fluidized state runs down by gravity, whereby the core glass and the clad glass are integrated.
Claims8
A method for manufacturing an optical fiber that is inserted into an insertion portion of an endoscope and guides light,
- wherein in an inner portion of an upright fiber drawing furnace used in an rod-in-tube method, in an inner portion of a hollow clad tube including a clad glass having a viscosity η1 of 5.0<Log η1<7.0 at a temperature at which a viscosity η2 of a core glass becomes Log η2=3.5, the core glass in a fluidized state runs down by gravity, whereby the core glass and the clad glass are integrated.
An optical fiber that is inserted into an insertion portion of an endoscope and guides light,
- wherein a viscosity η1 of a clad glass at a temperature at which a viscosity η2 of a core glass becomes Log η2=3.5 is 5.0<Log η1<7.0.
An endoscope comprising an optical fiber that is inserted into an insertion portion and guides light, wherein a viscosity η1 of a clad glass at a temperature at which a viscosity η2 of a core glass becomes Log η2=3.5 is 5.0<Log η1<7.0.
Dependencies are inferred from the claim text.