SG11201908016WA - Substrate for magnetic disks, and magnetic disk - Google Patents

Substrate for magnetic disks, and magnetic disk

Info

Publication number
SG11201908016WA
SG11201908016WA SG11201908016WA SG11201908016WA SG11201908016WA SG 11201908016W A SG11201908016W A SG 11201908016WA SG 11201908016W A SG11201908016W A SG 11201908016WA SG 11201908016W A SG11201908016W A SG 11201908016WA SG 11201908016W A SG11201908016W A SG 11201908016WA
Authority
SG
Singapore
Prior art keywords
substrate
magnetic
magnetic disk
film
disks
Prior art date
Application number
SG11201908016WA
Inventor
Kinobu Osakabe
Original Assignee
Hoya Corp
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 by Hoya Corp filed Critical Hoya Corp
Publication of SG11201908016WA publication Critical patent/SG11201908016WA/en

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
    • G11B5/739—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
    • G11B5/62—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
    • 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
    • G11B5/73913—Composites or coated 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

Abstract

A substrate for a magnetic disk includes a substrate main body having two main surfaces, and a film that is provided on the main surfaces and is made of a material having a loss factor of 0.1 or more. The substrate for a magnetic 5 disk including the film has a thickness T of 0.700 mm or less, and a thickness D [mm] of the film provided on the main surfaces and the thickness T [mm] of the substrate for a magnetic disk including the film satisfy a relationship D≥0.0082/T−0.0015. 10
SG11201908016WA 2017-06-30 2018-07-02 Substrate for magnetic disks, and magnetic disk SG11201908016WA (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017129613 2017-06-30
PCT/JP2018/025104 WO2019004484A1 (en) 2017-06-30 2018-07-02 Substrate for magnetic disks, and magnetic disk

Publications (1)

Publication Number Publication Date
SG11201908016WA true SG11201908016WA (en) 2019-09-27

Family

ID=64742939

Family Applications (1)

Application Number Title Priority Date Filing Date
SG11201908016WA SG11201908016WA (en) 2017-06-30 2018-07-02 Substrate for magnetic disks, and magnetic disk

Country Status (7)

Country Link
US (3) US11152026B2 (en)
JP (4) JP6467118B1 (en)
CN (2) CN110431627B (en)
MY (1) MY196313A (en)
PH (1) PH12019502156A1 (en)
SG (1) SG11201908016WA (en)
WO (1) WO2019004484A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11031036B2 (en) 2017-03-31 2021-06-08 Hoya Corporation Non-magnetic substrate for magnetic disk, and magnetic disk
MY196313A (en) * 2017-06-30 2023-03-24 Hoya Corp Substrate For Magnetic Disks, and Magnetic Disk
JP6895918B2 (en) * 2018-03-23 2021-06-30 古河電気工業株式会社 Manufacturing method of aluminum alloy substrate for magnetic disk, disk drive, and aluminum alloy substrate for magnetic disk
JP7077248B2 (en) * 2019-02-07 2022-05-30 株式会社東芝 Disk device
JP7037600B2 (en) * 2020-07-03 2022-03-16 株式会社Uacj A magnetic disk substrate and a magnetic disk using the magnetic disk substrate

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US5759681A (en) 1995-02-03 1998-06-02 Hitachi, Ltd. Magnetic recording medium and magnetic recording system using the same
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US6383404B1 (en) * 1998-08-19 2002-05-07 Hoya Corporation Glass substrate for magnetic recording medium, magnetic recording medium, and method of manufacturing the same
US6316097B1 (en) * 1998-09-28 2001-11-13 Seagate Technology Llc Electroless plating process for alternative memory disk substrates
JP2003016633A (en) * 2001-06-28 2003-01-17 Asahi Glass Co Ltd Glass substrate for magnetic disk and method for manufacturing the same
JP2003263713A (en) * 2002-03-08 2003-09-19 Canon Inc Cylindrical magnetic recording medium and its manufacturing method
JP2005322364A (en) * 2004-05-11 2005-11-17 Fuji Electric Device Technology Co Ltd Disk substrate for vertical magnetic recording medium, vertical magnetic recording medium using substrate and manufacturing method thereof
US7573674B1 (en) * 2004-12-23 2009-08-11 Maxtor Corporation Storage disk having increased damping characteristics in a disk drive
US7564181B2 (en) * 2005-04-08 2009-07-21 Eastman Kodak Company Performance enhancement layer for OLED devices
JP2006302358A (en) * 2005-04-18 2006-11-02 Kobe Steel Ltd Aluminum alloy substrate for magnetic recording medium and magnetic recording medium
JP2007066390A (en) * 2005-08-30 2007-03-15 Konica Minolta Opto Inc Substrate for magnetic recording medium and method for manufacturing substrate for magnetic recording medium
WO2007072835A1 (en) * 2005-12-19 2007-06-28 Showa Denko K.K. Magnetic disk substrate and magnetic disk thereof
JP4665886B2 (en) * 2006-10-27 2011-04-06 富士電機デバイステクノロジー株式会社 Perpendicular magnetic recording medium, perpendicular magnetic recording medium substrate, and manufacturing method thereof
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JP5687893B2 (en) * 2010-12-17 2015-03-25 Hoya株式会社 Glass substrate for recording medium
JP5029777B1 (en) * 2011-11-22 2012-09-19 旭硝子株式会社 GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM USING THE GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM
SG11201405695XA (en) * 2012-03-30 2014-12-30 Hoya Corp Magnetic-disk glass substrate, magnetic disk, magnetic-disk drive device
JP6014385B2 (en) * 2012-05-14 2016-10-25 昭和電工株式会社 Magnetic recording medium and magnetic recording / reproducing apparatus
WO2014208717A1 (en) * 2013-06-27 2014-12-31 Hoya株式会社 Disk-shaped glass substrate, magnetic disk glass substrate, method of manufacturing magnetic disk glass substrate, and magnetic disk
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JP5915718B1 (en) * 2014-11-07 2016-05-11 旭硝子株式会社 Glass substrate for magnetic disk and magnetic disk
JP5939350B1 (en) * 2015-12-28 2016-06-22 旭硝子株式会社 Glass substrate for magnetic recording medium, magnetic recording medium
TWI755466B (en) 2016-12-28 2022-02-21 日商東洋鋼鈑股份有限公司 Substrate for hard disk and hard disk device using the same
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US11031036B2 (en) * 2017-03-31 2021-06-08 Hoya Corporation Non-magnetic substrate for magnetic disk, and magnetic disk
MY196313A (en) * 2017-06-30 2023-03-24 Hoya Corp Substrate For Magnetic Disks, and Magnetic Disk

Also Published As

Publication number Publication date
US20200027481A1 (en) 2020-01-23
CN113362863B (en) 2022-09-30
MY196313A (en) 2023-03-24
US11152026B2 (en) 2021-10-19
JP7092689B2 (en) 2022-06-28
JP7326542B2 (en) 2023-08-15
CN113362863A (en) 2021-09-07
US11694718B2 (en) 2023-07-04
PH12019502156A1 (en) 2020-07-06
JP2022120158A (en) 2022-08-17
US20230298623A1 (en) 2023-09-21
US20210407544A1 (en) 2021-12-30
CN110431627A (en) 2019-11-08
JP6467118B1 (en) 2019-02-06
JP2019053813A (en) 2019-04-04
JP2023133503A (en) 2023-09-22
JPWO2019004484A1 (en) 2019-06-27
WO2019004484A1 (en) 2019-01-03
CN110431627B (en) 2021-07-02

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