Title:
DEHYDRATING AND SINTERING FURNACE FOR OPTICAL FIBER PREFORM
Document Type and Number:
Japanese Patent JP3301146
Kind Code:
B2
Abstract:
PURPOSE: To prevent the wear of the heating element and heatresistant insulating material by oxidation at low temp. by arranging an annular body furnished with an oxidation-worn material in a furnace body below an annular heater surrounding a furnace core tube piercing the hollow furnace body.
CONSTITUTION: An upper lid 1a is provided at the upper end of a hollow furnace body 1 and a lower lid 1b at the lower end, and a furnace core tube 2 piercing the center of the furnace body 1, passed vertically through an optical fiber porous preform and used for dehydrating the preform, adding a refractive index control element and sintering the preform is supported by the upper lid 1a. An annular heater 3 is furnished around the tube 2, and a heat-resistant insulating material 5 is filled between the tube 2 and the material 5. Further, a part or the whole of an annular body formed with an oxidation-worn material 6 is provided between the tube 2 and the material 5.
Inventors:
Koji Takada
Toshimi Habasaki
Fumitaka Uchino
Hiroaki Konishi
Toshimi Habasaki
Fumitaka Uchino
Hiroaki Konishi
Application Number:
JP5072093A
Publication Date:
July 15, 2002
Filing Date:
March 11, 1993
Export Citation:
Assignee:
Sumitomo Electric Industries, Ltd.
International Classes:
C03B37/014; F27D11/00; G02B6/00; (IPC1-7): C03B37/014; F27D11/00
Domestic Patent References:
| JP60231439A | ||||
| JP2255544A | ||||
| JP6096536A | ||||
| JP6186434A | ||||
| JP63151642A |
Attorney, Agent or Firm:
Akira Uchida (2 outside)