US 6,779,362 B2 · Method of making an optical fiber preform where a second elongation is based on a mark on a glass rod

Abstract

A method for manufacturing an optical fiber comprises setting a heating condition for heating a glass rod, which is a parent material of the optical fiber, and an elongating speed of the glass rod based on a prescribed numerical value which changes with a progress of elongation of the glass rod; heating and elongating the glass rod to generate a preform based on the heating condition and the elongating speed which are set by the setting; and drawing the preform to a filament-like form by further heating the preform to generate the optical fiber.

Claims8

Dependent claims

A method for manufacturing an optical fiber comprising:

first elongating a glass rod base material in a vertical direction to produce a glass rod;
generating a preform by second elongating said glass rod in a horizontal direction;
and
drawing said preform to a filament-like form by heating said preform to generate said optical fiber
wherein said second elongating includes:
setting a heating condition for heating said glass rod, and an elongating speed of said glass rod based on a location of a mark provided on said glass rod;
heating and elongating said glass rod in the horizontal direction based on said heating condition and said elongating speed which are set by said setting.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application

10/158,904Filed 3 Jun 2002 · division

Priority

JP 10-3145535 Nov 1998

Published

US 2002/0148257 A117 Oct 2002

Granted

24 Aug 2004

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

C03B 23/047
Re-forming tubes or rods: by drawing
C03B 37/01202
Manufacture of preforms for drawing fibres or filaments: means for storing or carrying optical fibre preforms, e.g. containers
C03B 37/01205
Manufacture of preforms for drawing fibres or filaments: starting from tubes, rods, fibres or filaments
C03B 37/0124
Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing: means for reducing the diameter of rods…

Method of making an optical fiber preform where a second elongation is based on a mark on a glass rod

Life of this patent

Method of making an optical fiber preform where a second elongation is based on a mark on a glass rod

Life of this patent

Abstract

Claims8