Glass manufacturing – Processes – With coating
Patent
1992-12-04
1995-01-31
Jones, W. Gary
Glass manufacturing
Processes
With coating
65 605, 65386, 65399, 427162, 427224, 4274197, 4274196, 427314, C03C 1700
Patent
active
053855949
ABSTRACT:
In the first step, a fuel and raw material gases are fed to burner while flames from the burner scan a Si substrate. Synthesized fine glass particles are deposited on the substrate to form a first porous vitreous layer to be an under cladding layer. In the second step, the first porous vitreous layer is heated by the flames. A bulk density of an upper part of the first porous vitreous layer is raised to 0.3 g/cm.sup.3. Having a raised bulk density, this upper part functions as a shield layer against GeO.sub.2. In the third step, a second porous vitreous layer, to be a core layer, is deposited uniformly on the first porous vitreous layer. In the fourth step, the first and the second porous vitreous layers are sintered. In this case, the shield layer with a higher bulk density hinders the GeO.sub.2 component which has evaporated from the second porous vitreous layer from diffusing into the first porous vitreous layer.
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patent: 4425146 (1984-01-01), Izawa et al.
patent: 5215564 (1993-06-01), Weber
Miyashita, "Fiber Optic Component Technology in PIRI", NTT Review, vol. 1, No. 3, Sep. 1989.
Aikawa Haruhiko
Hirose Chisai
Ishikawa Shinji
Kanamori Hiroo
Saito Masahide
Griffin Steven P.
Jones W. Gary
Sumitomo Electric Industries Ltd.
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