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US 4,197,136 AGranted
Optical transmission line glass and its method of manufacture
AssigneeFujitsu Limited
InventorsKozo Inoue, Junjiro Goto, Yoshio Kawabata
Life of this patent
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Abstract
Optical transmission line glass includes phosphorus pentoxide and germanium dioxide as the major glass forming oxides and gallium trioxide for waterproofing and refractive index control. A method of manufacture of such glass material utilizes a gas phase chemical reaction.
Claims3
Optical transmission line glass having an improved waterproof property, consisting essentially of
- 10 to 58 weight % of phosphoric pentoxide P.sub.2 O.sub.5 ;
- 15 to 85 weight % of germanium dioxide GeO.sub.2 ;
- and
- 5 to 40 weight % of gallium trioxide Ga.sub.2 O.sub.3, said gallium trioxide being added to control the refractive index in values of less than 1.61 with said refractive index decreasing substantially linearly with increasing gallium trioxide.
1 more element
Optical transmission line glass having an improved waterproof property, consisting essentially of
- 75 to 90% of total weight of phosphoric pentoxide P.sub.2 O.sub.5 and germanium dioxide GeO.sub.2 mixed in a weight ratio of 4:6;
- and
- 10 to 25 weight % of gallium trioxide, said gallium trioxide being added to control the refractive index with said refractive index decreasing substantially linearly with increasing gallium trioxide.
Dependencies are inferred from the claim text.