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US 6,387,510 B1Granted
Glass for a data storage medium substrate and glass substrate for data storage media
AssigneeAsahi Glass Company, Limited
InventorsTetsuya Nakashima, Yasumasa Nakao, Akio Koike
Life of this patent
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Abstract
A glass for a data storage medium substrate, which consists essentially of the following components as represented by mol %: SiO2 60 to 72, Al2O3 2 to 9 MgO 3 to 9, CaO 2 to 10, SrO 0 to 15, ZnO 0 to 4, TiO2 0 to 8, ZrO2 0 to 4, Li2O 1 to 12, Na2O 0 to 8, K2O 0 to 5, Y2O3 0 to 5, La2O3 0 to 5, and Li2O + Na2O + K2O 4 to 15, and which has a Young's modulus of at least 85 GPa.
Claims19
A glass for a data storage medium substrate, consisting essentially of the following components as represented in mol %:
- SiO2 60 to 72, Al2O3 2 to 9 MgO 3 to 9, CaO 2 to 10, SrO 0 to 15, ZnO 0 to 4, TiO2 0 to 8, ZrO2 0 to 4, Li2O 1 to 12, Na2O 0 to 8, K2O 0 to 5, Y2O3 0 to 5, La2O3 0 to 5, and Li2O + Na2O + K2O 4 to 15,
- wherein said glass has a Young's modulus of at least 85 GPa;
- and
- wherein (Al2O3—Li2O)≦2.2 mol %.
1 more element
Dependencies are inferred from the claim text.