JP6975862B2 - 磁気ディスク用基板及び磁気ディスク - Google Patents

磁気ディスク用基板及び磁気ディスク Download PDF

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Publication number
JP6975862B2
JP6975862B2 JP2020535859A JP2020535859A JP6975862B2 JP 6975862 B2 JP6975862 B2 JP 6975862B2 JP 2020535859 A JP2020535859 A JP 2020535859A JP 2020535859 A JP2020535859 A JP 2020535859A JP 6975862 B2 JP6975862 B2 JP 6975862B2
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Prior art keywords
substrate
magnetic disk
less
plate thickness
disk according
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Japanese (ja)
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JPWO2020032146A1 (ja
Inventor
伸二 江田
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Hoya Corp
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Hoya Corp
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Priority to JP2021181989A priority Critical patent/JP7286735B2/ja
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    • 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
    • G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • 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
    • 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
    • G11B5/73917—Metallic substrates, i.e. elemental metal or metal alloy substrates
    • 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
    • G11B5/73917—Metallic substrates, i.e. elemental metal or metal alloy substrates
    • G11B5/73919—Aluminium or titanium elemental or alloy substrates

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Metallurgy (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Magnetic Record Carriers (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Glass Compositions (AREA)
  • Paints Or Removers (AREA)
  • Laminated Bodies (AREA)
JP2020535859A 2018-08-07 2019-08-07 磁気ディスク用基板及び磁気ディスク Active JP6975862B2 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2021181989A JP7286735B2 (ja) 2018-08-07 2021-11-08 磁気ディスク用基板及び磁気ディスク

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2018148923 2018-08-07
JP2018148923 2018-08-07
JP2019009901 2019-01-24
JP2019009901 2019-01-24
PCT/JP2019/031269 WO2020032146A1 (ja) 2018-08-07 2019-08-07 磁気ディスク用基板及び磁気ディスク

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP2021181989A Division JP7286735B2 (ja) 2018-08-07 2021-11-08 磁気ディスク用基板及び磁気ディスク

Publications (2)

Publication Number Publication Date
JPWO2020032146A1 JPWO2020032146A1 (ja) 2021-05-13
JP6975862B2 true JP6975862B2 (ja) 2021-12-01

Family

ID=69414888

Family Applications (5)

Application Number Title Priority Date Filing Date
JP2020535859A Active JP6975862B2 (ja) 2018-08-07 2019-08-07 磁気ディスク用基板及び磁気ディスク
JP2021181989A Active JP7286735B2 (ja) 2018-08-07 2021-11-08 磁気ディスク用基板及び磁気ディスク
JP2023085439A Active JP7545526B2 (ja) 2018-08-07 2023-05-24 磁気ディスク用基板、磁気ディスク及びハードディスクドライブ
JP2024141833A Active JP7733785B2 (ja) 2018-08-07 2024-08-23 磁気ディスク用基板、磁気ディスク及びハードディスクドライブ
JP2025138811A Pending JP2025166243A (ja) 2018-08-07 2025-08-22 磁気ディスク用基板及び磁気ディスク

Family Applications After (4)

Application Number Title Priority Date Filing Date
JP2021181989A Active JP7286735B2 (ja) 2018-08-07 2021-11-08 磁気ディスク用基板及び磁気ディスク
JP2023085439A Active JP7545526B2 (ja) 2018-08-07 2023-05-24 磁気ディスク用基板、磁気ディスク及びハードディスクドライブ
JP2024141833A Active JP7733785B2 (ja) 2018-08-07 2024-08-23 磁気ディスク用基板、磁気ディスク及びハードディスクドライブ
JP2025138811A Pending JP2025166243A (ja) 2018-08-07 2025-08-22 磁気ディスク用基板及び磁気ディスク

Country Status (6)

Country Link
US (4) US11640833B2 (https=)
JP (5) JP6975862B2 (https=)
CN (2) CN112513985B (https=)
MY (1) MY208527A (https=)
SG (1) SG11202100827XA (https=)
WO (1) WO2020032146A1 (https=)

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MY208527A (en) 2018-08-07 2025-05-14 Hoya Corp Substrate for magnetic disk and magnetic disk
JP7037600B2 (ja) * 2020-07-03 2022-03-16 株式会社Uacj 磁気ディスク用基板及び当該磁気ディスク用基板を用いた磁気ディスク
JP6985487B1 (ja) * 2020-12-08 2021-12-22 株式会社Uacj 磁気ディスク基板および磁気ディスク
JPWO2023100893A1 (https=) * 2021-12-01 2023-06-08
JP7717846B2 (ja) * 2022-01-11 2025-08-04 古河電気工業株式会社 磁気ディスク用基板及びこれを用いた磁気ディスク
JP7113157B1 (ja) * 2022-03-30 2022-08-04 古河電気工業株式会社 磁気ディスク及び磁気ディスク用基板
CN120937077A (zh) * 2023-03-31 2025-11-11 豪雅株式会社 信息记录介质用盘、盘中间体及信息记录介质用基板
WO2025143137A1 (ja) * 2023-12-27 2025-07-03 Hoya株式会社 情報記録媒体用ディスク

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JP2020107382A (ja) * 2018-12-28 2020-07-09 昭和電工株式会社 磁気記録媒体用基板、磁気記録媒体、ハードディスクドライブ
JP2022034298A (ja) * 2020-08-18 2022-03-03 株式会社東芝 ディスク装置

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Publication number Publication date
US20210256999A1 (en) 2021-08-19
JP2024157052A (ja) 2024-11-06
US12475924B2 (en) 2025-11-18
US20240296867A1 (en) 2024-09-05
JPWO2020032146A1 (ja) 2021-05-13
CN112513985A (zh) 2021-03-16
JP2022010156A (ja) 2022-01-14
CN116798456A (zh) 2023-09-22
JP7545526B2 (ja) 2024-09-04
WO2020032146A1 (ja) 2020-02-13
JP7286735B2 (ja) 2023-06-05
JP2023106546A (ja) 2023-08-01
US20260065934A1 (en) 2026-03-05
US11640833B2 (en) 2023-05-02
SG11202100827XA (en) 2021-03-30
JP7733785B2 (ja) 2025-09-03
CN112513985B (zh) 2023-07-28
JP2025166243A (ja) 2025-11-05
MY208527A (en) 2025-05-14
US20230253012A1 (en) 2023-08-10
US12020735B2 (en) 2024-06-25

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