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Patent Searching and Data


Title:
METHOD FOR DRAWING OPTICAL FIBER
Document Type and Number:
Japanese Patent JPH06211534
Kind Code:
A
Abstract:

PURPOSE: To provide the method for drawing an optical fiber for production of the high-quality optical fiber having a uniform shape.

CONSTITUTION: The image of the foremost end 62a of a perform 62 for the optical fiber melted to a meniscus form by heating in a heating furnace 68 is picked up by a CCD camera 2 and its area is calculated by an image processing section 4, by which the volume of the molten foremost end 62a is estimated. Whether the calculated area is a prescribed value or not is compared in an image recording and comparing section 6 which outputs a differential signal S6 to a speed controller 5. This speed controller 5 controls a motor 74 at the feed speed R based on the differential signal S6 and regulates the transporting speed of the preform 62 for the optical fiber to be introduced into the heating furnace 68.


Inventors:
YASU YOU
INABA SHIGEO
Application Number:
JP501493A
Publication Date:
August 02, 1994
Filing Date:
January 14, 1993
Export Citation:
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Assignee:
FURUKAWA ELECTRIC CO LTD
International Classes:
C03B37/025; C03B37/027; C03B37/07; G02B6/00; (IPC1-7): C03B37/027; C03B20/00; C03B37/07
Attorney, Agent or Firm:
Takahisa Sato