JPWO2023136242A1 - - Google Patents

Info

Publication number
JPWO2023136242A1
JPWO2023136242A1 JP2023574033A JP2023574033A JPWO2023136242A1 JP WO2023136242 A1 JPWO2023136242 A1 JP WO2023136242A1 JP 2023574033 A JP2023574033 A JP 2023574033A JP 2023574033 A JP2023574033 A JP 2023574033A JP WO2023136242 A1 JPWO2023136242 A1 JP WO2023136242A1
Authority
JP
Japan
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.)
Granted
Application number
JP2023574033A
Other languages
Japanese (ja)
Other versions
JP7717846B2 (ja
JPWO2023136242A5 (https=
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Publication of JPWO2023136242A1 publication Critical patent/JPWO2023136242A1/ja
Publication of JPWO2023136242A5 publication Critical patent/JPWO2023136242A5/ja
Application granted granted Critical
Publication of JP7717846B2 publication Critical patent/JP7717846B2/ja
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • G11B5/735—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 characterised by the back layer
    • G11B5/7356—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 characterised by the back layer comprising non-magnetic particles in the back layer, e.g. particles of TiO2, ZnO or SiO2
    • G11B5/7358—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 characterised by the back layer comprising non-magnetic particles in the back layer, e.g. particles of TiO2, ZnO or SiO2 specially adapted for achieving a specific property, e.g. average roughness [Ra]
    • 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
    • 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
    • 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
    • G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
    • G11B5/82—Disk 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
    • G11B5/84—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
    • G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
    • G11B5/8404—Processes or apparatus specially adapted for manufacturing record carriers manufacturing base layers

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Record Carriers (AREA)
JP2023574033A 2022-01-11 2023-01-10 磁気ディスク用基板及びこれを用いた磁気ディスク Active JP7717846B2 (ja)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2022002122 2022-01-11
JP2022002122 2022-01-11
PCT/JP2023/000342 WO2023136242A1 (ja) 2022-01-11 2023-01-10 磁気ディスク用基板及びこれを用いた磁気ディスク

Publications (3)

Publication Number Publication Date
JPWO2023136242A1 true JPWO2023136242A1 (https=) 2023-07-20
JPWO2023136242A5 JPWO2023136242A5 (https=) 2024-06-24
JP7717846B2 JP7717846B2 (ja) 2025-08-04

Family

ID=87279116

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2023574033A Active JP7717846B2 (ja) 2022-01-11 2023-01-10 磁気ディスク用基板及びこれを用いた磁気ディスク

Country Status (4)

Country Link
US (1) US20240355357A1 (https=)
JP (1) JP7717846B2 (https=)
CN (1) CN118435279A (https=)
WO (1) WO2023136242A1 (https=)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07226044A (ja) * 1994-02-08 1995-08-22 Sony Corp 磁気ディスク
WO2014069609A1 (ja) * 2012-10-31 2014-05-08 Hoya株式会社 磁気ディスク用ガラス基板の製造方法及び磁気ディスクの製造方法
JP2019125413A (ja) * 2017-09-29 2019-07-25 Hoya株式会社 ガラススペーサ及びハードディスクドライブ装置
WO2020032146A1 (ja) * 2018-08-07 2020-02-13 Hoya株式会社 磁気ディスク用基板及び磁気ディスク
WO2022004826A1 (ja) * 2020-07-03 2022-01-06 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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07226044A (ja) * 1994-02-08 1995-08-22 Sony Corp 磁気ディスク
WO2014069609A1 (ja) * 2012-10-31 2014-05-08 Hoya株式会社 磁気ディスク用ガラス基板の製造方法及び磁気ディスクの製造方法
JP2019125413A (ja) * 2017-09-29 2019-07-25 Hoya株式会社 ガラススペーサ及びハードディスクドライブ装置
WO2020032146A1 (ja) * 2018-08-07 2020-02-13 Hoya株式会社 磁気ディスク用基板及び磁気ディスク
WO2022004826A1 (ja) * 2020-07-03 2022-01-06 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

Also Published As

Publication number Publication date
JP7717846B2 (ja) 2025-08-04
WO2023136242A1 (ja) 2023-07-20
US20240355357A1 (en) 2024-10-24
CN118435279A (zh) 2024-08-02

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