C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
117/85
C03B 37/02 (2006.01) C03B 19/14 (2006.01) C03B 37/014 (2006.01)
Patent
CA 1106710
Blankenship 7 METHOD OF MAKING OPTICAL DEVICES Abstract of the Disclosure A method of making glass articles by the flame hydrolysis technique. Particles of glass soot produced by flame hydrolysis are deposited on the outside surface of a mandrel to form a porous preform. The soot particles closer to the mandrel have a refractive index greater than that of the soot disposed toward the outer surface of the preform. The soot having the greater refractive index value has a viscosity lower than that of the soot having the lower refractive index value. The mandrel is removed, and a vacuum pump is connected to the resultant aperture. The soot preform is subjected to a high temperature whereby it is consolidated to form a dense glass blank. The low pressure within the preform, the glass surface tension and the relative viscosities of the inner and outer portions of the preform cause the aperture to close during the consolidation process. The resultant blank may be heated and drawn into a filament, or it may be sliced into optical windows, lenses or the like.
302341
Corning Glass Works
Gowling Lafleur Henderson Llp
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