Title:
A glass substrate for information recording media, and an information recording medium
Document Type and Number:
Japanese Patent JP6029740
Kind Code:
B2
Abstract:
This glass substrate for information recording media contains, in mol%, 56-71% of SiO2, 5-15% of Al2O3, 0-3% of B2O3, 0.1-6% of Li2O, 0.1-4% of Na2O, 0-2% of K2O, 3-13% of MgO, 4-21% of CaO, 0-3% of SrO, 0-3% of BaO, 0-3% of ZnO, 0-3% ZrO2, 0-2% of CeO2, 0-2% of SnO2, 0-5% of TiO2 and 0-3% of Nb2O5, while satisfying the following glass composition ratios, SiO2 + Al2O3 +B2O3 being 64-80%, Li2O + Na2O + K2O being 0.2-6%, MgO + CaO + SrO + BaO + ZnO being 14-28%, (Nb2O5 + TiO2)/SiO2 = 0.01-0.06 and Li2O/(Li2O + Na2O + K2O) = 0.30-0.99.
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Inventors:
Kajida Daishi
Application Number:
JP2015504317A
Publication Date:
November 24, 2016
Filing Date:
March 04, 2014
Export Citation:
Assignee:
HOYA CORPORATION
International Classes:
C03C3/087; C03C3/091; C03C3/093; C03C3/095; C03C3/097; G11B5/73
Domestic Patent References:
| JP2000357318A | 2000-12-26 | |||
| JP2001172043A | 2001-06-26 |
Foreign References:
| WO2012057338A1 | 2012-05-03 |
Attorney, Agent or Firm:
Fukami patent office
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