JPWO2021117897A1 - - Google Patents

Info

Publication number
JPWO2021117897A1
JPWO2021117897A1 JP2021564073A JP2021564073A JPWO2021117897A1 JP WO2021117897 A1 JPWO2021117897 A1 JP WO2021117897A1 JP 2021564073 A JP2021564073 A JP 2021564073A JP 2021564073 A JP2021564073 A JP 2021564073A JP WO2021117897 A1 JPWO2021117897 A1 JP WO2021117897A1
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
JP2021564073A
Other languages
Japanese (ja)
Other versions
JP7383050B2 (ja
JPWO2021117897A5 (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 JPWO2021117897A1 publication Critical patent/JPWO2021117897A1/ja
Publication of JPWO2021117897A5 publication Critical patent/JPWO2021117897A5/ja
Priority to JP2023134923A priority Critical patent/JP7621437B2/ja
Application granted granted Critical
Publication of JP7383050B2 publication Critical patent/JP7383050B2/ja
Priority to JP2025004745A priority patent/JP2025061251A/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
    • G11B5/739—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
    • C03C3/095—Glass compositions containing silica with 40% to 90% silica, by weight containing rare earths
    • 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
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/038—Centering or locking of a plurality of discs in a single cartridge
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
    • G11B23/03—Containers for flat 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
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
    • G11B5/23—Gap features
    • G11B5/235—Selection of material for gap filler
    • 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
    • G11B5/72—Protective coatings, e.g. anti-static or antifriction
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • B24B41/047—Grinding heads for working on plane surfaces
    • B24B41/053—Grinding heads for working on plane surfaces for grinding or polishing glass

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Glass Compositions (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Magnetic Record Carriers (AREA)
JP2021564073A 2019-12-13 2020-12-11 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 JP7383050B2 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2023134923A JP7621437B2 (ja) 2019-12-13 2023-08-22 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
JP2025004745A JP2025061251A (ja) 2019-12-13 2025-01-14 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
JP2019225368 2019-12-13
JP2019225368 2019-12-13
PCT/JP2020/046405 WO2021117897A1 (ja) 2019-12-13 2020-12-11 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
JP2023134923A Division JP7621437B2 (ja) 2019-12-13 2023-08-22 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
JPWO2021117897A1 true JPWO2021117897A1 (https=) 2021-06-17
JPWO2021117897A5 JPWO2021117897A5 (https=) 2023-01-10
JP7383050B2 JP7383050B2 (ja) 2023-11-17

Family

ID=76330058

Family Applications (3)

Application Number Title Priority Date Filing Date
JP2021564073A Active JP7383050B2 (ja) 2019-12-13 2020-12-11 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
JP2023134923A Active JP7621437B2 (ja) 2019-12-13 2023-08-22 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
JP2025004745A Pending JP2025061251A (ja) 2019-12-13 2025-01-14 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 (2)

Application Number Title Priority Date Filing Date
JP2023134923A Active JP7621437B2 (ja) 2019-12-13 2023-08-22 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
JP2025004745A Pending JP2025061251A (ja) 2019-12-13 2025-01-14 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 (3) US11999652B2 (https=)
JP (3) JP7383050B2 (https=)
CN (1) CN114787093A (https=)
MY (1) MY208742A (https=)
WO (1) WO2021117897A1 (https=)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11081133B2 (en) * 2016-11-14 2021-08-03 Hoya Corporation Glass for magnetic recording medium substrate, magnetic recording medium substrate, magnetic recording medium and glass spacer for magnetic recording and reproducing apparatus
MY204452A (en) 2018-05-16 2024-08-29 Hoya Corp Glass for magnetic recording medium substrate, magnetic recording medium substrate, magnetic recording medium, glass spacer for magnetic recording and reproducing apparatus, and magnetic recording and reproducing apparatus
WO2020262702A1 (ja) * 2019-06-28 2020-12-30 Hoya株式会社 ガラス板の製造方法および磁気ディスクの製造方法
CN120441191A (zh) * 2019-07-22 2025-08-08 Hoya株式会社 玻璃、磁记录介质基板、磁记录介质、磁记录再生装置用玻璃间隔物和磁记录再生装置
CN114787093A (zh) * 2019-12-13 2022-07-22 豪雅株式会社 磁记录介质基板用或磁记录再生装置用玻璃间隔物用的玻璃、磁记录介质基板、磁记录介质、磁记录再生装置用玻璃间隔物和磁记录再生装置
WO2023281610A1 (ja) * 2021-07-05 2023-01-12 Hoya株式会社 ガラス板、円板状ガラス、および磁気ディスク用ガラス基板
JP7766206B2 (ja) * 2022-09-08 2025-11-07 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磁気記録再生装置
JP2025010844A (ja) * 2023-07-10 2025-01-23 日本板硝子株式会社 情報記録媒体用ガラス板

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000187828A (ja) * 1998-02-26 2000-07-04 Ohara Inc 情報磁気記憶媒体用高剛性ガラスセラミックス基板
WO2013183569A1 (ja) * 2012-06-05 2013-12-12 旭硝子株式会社 磁気ディスクの製造方法および情報記録媒体用ガラス基板
WO2013183626A1 (ja) * 2012-06-05 2013-12-12 旭硝子株式会社 無アルカリガラスおよびその製造方法
JP2015054794A (ja) * 2013-09-11 2015-03-23 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

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JPS6144732A (ja) * 1984-08-06 1986-03-04 Toshiba Corp 基板用ガラス
MY118912A (en) * 1996-09-04 2005-02-28 Hoya Corp Glass for information recording medium substrate and glass substrate
JP3011703B1 (ja) * 1998-02-26 2000-02-21 株式会社オハラ 情報磁気記憶媒体用高剛性ガラスセラミックス基板
JPH11278865A (ja) * 1998-03-30 1999-10-12 Ngk Insulators Ltd 磁気ディスク基板用結晶化ガラス、磁気ディスク用基板、磁気ディスクおよび磁気ディスク基板用結晶化ガラスの製造方法
JP2004288228A (ja) * 2003-01-31 2004-10-14 Hoya Corp 情報記録媒体用基板、情報記録媒体およびその製造方法
SG171640A1 (en) * 2006-06-08 2011-06-29 Hoya Corp Glass for use in substrate for information recording medium, substrate for information recording medium and information recording medium, and their manufacturing method
EP2465828A4 (en) * 2009-08-10 2014-03-26 Hoya Corp GLASS FOR MAGNETIC RECORDING MEDIUM SUBSTRATE, MAGNETIC RECORDING MEDIUM SUBSTRATE AND METHOD FOR PRODUCING THE SAME, AND MAGNETIC RECORDING MEDIUM
SG184235A1 (en) * 2010-03-31 2012-10-30 Hoya Corp Method of manufacturing glass blank for magnetic recording medium glass substrate, method of manufacturing magnetic recording medium glass substrate, and method of manufacturing magnetic recording medium
US8394516B2 (en) * 2010-10-29 2013-03-12 Hoya Corporation Glass substrate for magnetic recording medium and magnetic recording medium
US8652660B2 (en) * 2010-12-21 2014-02-18 Hoya Corporation Glass substrate for magnetic recording medium and its use
SG10201605515PA (en) * 2012-05-16 2016-09-29 Hoya Corp Glass for magnetic recording medium substrate and usage thereof
CN104364215A (zh) * 2012-06-05 2015-02-18 旭硝子株式会社 无碱玻璃及其制造方法
CN103708724B (zh) * 2012-09-29 2017-02-08 成都光明光电股份有限公司 精密模压用光学玻璃、玻璃预制件、光学元件及光学仪器
JP2015005479A (ja) 2013-06-24 2015-01-08 株式会社Ｇｓユアサ 蓄電素子
CN105517966B (zh) 2013-09-09 2017-12-19 Hoya株式会社 玻璃基板
JP2015224150A (ja) 2014-05-27 2015-12-14 旭硝子株式会社 無アルカリガラスの製造方法
US11081133B2 (en) * 2016-11-14 2021-08-03 Hoya Corporation Glass for magnetic recording medium substrate, magnetic recording medium substrate, magnetic recording medium and glass spacer for magnetic recording and reproducing apparatus
JP7276645B2 (ja) * 2017-08-08 2023-05-18 日本電気硝子株式会社 磁気記録媒体用ガラス基板
MY204452A (en) 2018-05-16 2024-08-29 Hoya Corp Glass for magnetic recording medium substrate, magnetic recording medium substrate, magnetic recording medium, glass spacer for magnetic recording and reproducing apparatus, and magnetic recording and reproducing apparatus
CN120441191A (zh) * 2019-07-22 2025-08-08 Hoya株式会社 玻璃、磁记录介质基板、磁记录介质、磁记录再生装置用玻璃间隔物和磁记录再生装置
CN114787093A (zh) * 2019-12-13 2022-07-22 豪雅株式会社 磁记录介质基板用或磁记录再生装置用玻璃间隔物用的玻璃、磁记录介质基板、磁记录介质、磁记录再生装置用玻璃间隔物和磁记录再生装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000187828A (ja) * 1998-02-26 2000-07-04 Ohara Inc 情報磁気記憶媒体用高剛性ガラスセラミックス基板
WO2013183569A1 (ja) * 2012-06-05 2013-12-12 旭硝子株式会社 磁気ディスクの製造方法および情報記録媒体用ガラス基板
WO2013183626A1 (ja) * 2012-06-05 2013-12-12 旭硝子株式会社 無アルカリガラスおよびその製造方法
JP2015054794A (ja) * 2013-09-11 2015-03-23 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

Also Published As

Publication number Publication date
US12473225B2 (en) 2025-11-18
CN114787093A (zh) 2022-07-22
US11999652B2 (en) 2024-06-04
MY208742A (en) 2025-05-27
JP7383050B2 (ja) 2023-11-17
JP2025061251A (ja) 2025-04-10
US20240286946A1 (en) 2024-08-29
JP7621437B2 (ja) 2025-01-24
US20260055020A1 (en) 2026-02-26
WO2021117897A1 (ja) 2021-06-17
JP2023166439A (ja) 2023-11-21
US20230192530A1 (en) 2023-06-22

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