JP7709621B2 - 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 - Google Patents

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

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Publication number
JP7709621B2
JP7709621B2 JP2024545729A JP2024545729A JP7709621B2 JP 7709621 B2 JP7709621 B2 JP 7709621B2 JP 2024545729 A JP2024545729 A JP 2024545729A JP 2024545729 A JP2024545729 A JP 2024545729A JP 7709621 B2 JP7709621 B2 JP 7709621B2
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JP
Japan
Prior art keywords
glass
less
magnetic recording
content
recording medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
JP2024545729A
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English (en)
Japanese (ja)
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JPWO2024053740A1 (https=
JPWO2024053740A5 (https=
Inventor
秀造 徳光
和明 橋本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoya Corp
Original Assignee
Hoya Corp
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Publication date
Application filed by Hoya Corp filed Critical Hoya Corp
Publication of JPWO2024053740A1 publication Critical patent/JPWO2024053740A1/ja
Publication of JPWO2024053740A5 publication Critical patent/JPWO2024053740A5/ja
Priority to JP2025113805A priority Critical patent/JP2025143430A/ja
Application granted granted Critical
Publication of JP7709621B2 publication Critical patent/JP7709621B2/ja
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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/739—Magnetic recording media substrates
    • G11B5/73911—Inorganic substrates
    • G11B5/73921—Glass or ceramic substrates
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)
JP2024545729A 2022-09-08 2023-09-08 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 Active JP7709621B2 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2025113805A JP2025143430A (ja) 2022-09-08 2025-07-04 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

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
PCT/JP2022/033744 WO2024053056A1 (ja) 2022-09-08 2022-09-08 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
JPPCT/JP2022/033744 2022-09-08
PCT/JP2023/032918 WO2024053740A1 (ja) 2022-09-08 2023-09-08 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

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP2025113805A Division JP2025143430A (ja) 2022-09-08 2025-07-04 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

Publications (3)

Publication Number Publication Date
JPWO2024053740A1 JPWO2024053740A1 (https=) 2024-03-14
JPWO2024053740A5 JPWO2024053740A5 (https=) 2025-04-24
JP7709621B2 true JP7709621B2 (ja) 2025-07-16

Family

ID=90191340

Family Applications (2)

Application Number Title Priority Date Filing Date
JP2024545729A Active JP7709621B2 (ja) 2022-09-08 2023-09-08 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
JP2025113805A Pending JP2025143430A (ja) 2022-09-08 2025-07-04 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

Family Applications After (1)

Application Number Title Priority Date Filing Date
JP2025113805A Pending JP2025143430A (ja) 2022-09-08 2025-07-04 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

Country Status (5)

Country Link
US (1) US20260080900A1 (https=)
EP (1) EP4586250A1 (https=)
JP (2) JP7709621B2 (https=)
CN (1) CN119856222A (https=)
WO (2) WO2024053056A1 (https=)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015037609A1 (ja) 2013-09-11 2015-03-19 Hoya株式会社 磁気記録媒体基板用ガラスおよび磁気記録媒体基板
JP2015096465A (ja) 2014-12-17 2015-05-21 Hoya株式会社 ガラス基板
WO2021015240A1 (ja) 2019-07-22 2021-01-28 Hoya株式会社 磁気記録媒体基板用ガラス、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

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3995902B2 (ja) 2001-05-31 2007-10-24 Ｈｏｙａ株式会社 情報記録媒体用ガラス基板及びそれを用いた磁気情報記録媒体
JP5734189B2 (ja) 2009-08-10 2015-06-17 Hoya株式会社 磁気記録媒体基板用ガラス、磁気記録媒体基板およびその製造方法、ならびに磁気記録媒体
JP5900560B2 (ja) * 2014-09-01 2016-04-06 旭硝子株式会社 基板用ガラスおよびガラス基板

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015037609A1 (ja) 2013-09-11 2015-03-19 Hoya株式会社 磁気記録媒体基板用ガラスおよび磁気記録媒体基板
JP2015096465A (ja) 2014-12-17 2015-05-21 Hoya株式会社 ガラス基板
WO2021015240A1 (ja) 2019-07-22 2021-01-28 Hoya株式会社 磁気記録媒体基板用ガラス、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

Also Published As

Publication number Publication date
CN119856222A (zh) 2025-04-18
WO2024053056A1 (ja) 2024-03-14
JPWO2024053740A1 (https=) 2024-03-14
EP4586250A1 (en) 2025-07-16
JP2025143430A (ja) 2025-10-01
US20260080900A1 (en) 2026-03-19
WO2024053740A1 (ja) 2024-03-14

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