Title:
磁気記録媒体基板用または磁気記録再生装置用ガラススペーサ用のガラス、磁気記録媒体基板、磁気記録媒体、磁気記録再生装置用ガラススペーサおよび磁気記録再生装置
Document Type and Number:
Japanese Patent JP7383050
Kind Code:
B2
Abstract:
Provided is a glass for a magnetic recording medium substrate or for a glass spacer for a magnetic recording/reproducing apparatus, in which the total content of Li2O, Na2O, K2O, B2O3, and ZnO (Li2O+Na2O+K2O+B2O3+ZnO) is in a range of 0 mol % or more and 3 mol % or less, the mole ratio of the total content of Al2O3 and MgO relative to the total content of SiO2 and CaO [(Al2O3+MgO)/(SiO2+CaO)] is in a range of 0.30 or more and 0.6 or less, the total content of SiO2 and Al2O3 (SiO2+Al2O3) is in a range of 64 mol % or more and 85 mol % or less, and the total content of SiO2, Al2O3, MgO, and CaO (SiO2+Al2O3+MgO+CaO) is in a range of 87 mol % or more and 98 mol % or less.
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| JP3152679 | OPTICAL GLASS |
| WO/2013/136013 | GLASS SHEET |
| WO/2021/063834 | GLASS ARTICLES, METHODS FOR THE PRODUCTION AND USES THEREOF |
Inventors:
Koichi Sato
Kazuaki Hashimoto
Kazuaki Hashimoto
Application Number:
JP2021564073A
Publication Date:
November 17, 2023
Filing Date:
December 11, 2020
Export Citation:
Assignee:
HOYA Corporation
International Classes:
C03C3/085; C03C3/087; C03C3/091; G11B5/73; G11B5/82; G11B17/038; G11B23/03
Domestic Patent References:
| JP2000187828A | ||||
| JP2015054794A |
Foreign References:
| WO2013183626A1 | ||||
| WO2013183569A1 |
Attorney, Agent or Firm:
Sykes Patent Attorney Corporation
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