DE60320695D1 - Magnetpulver für magnetisches Aufzeichnung - Google Patents

Magnetpulver für magnetisches Aufzeichnung

Info

Publication number
DE60320695D1
DE60320695D1 DE60320695T DE60320695T DE60320695D1 DE 60320695 D1 DE60320695 D1 DE 60320695D1 DE 60320695 T DE60320695 T DE 60320695T DE 60320695 T DE60320695 T DE 60320695T DE 60320695 D1 DE60320695 D1 DE 60320695D1
Authority
DE
Germany
Prior art keywords
magnetic
powder
recording
magnetic recording
magnetic powder
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.)
Expired - Lifetime
Application number
DE60320695T
Other languages
English (en)
Inventor
Kazuyuki Matsumoto
Kimitaka Sato
Takatoshi Fujino
Kenichi Inoue
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.)
Dowa Electronics Materials Co Ltd
Original Assignee
Dowa Electronics Materials Co Ltd
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 Dowa Electronics Materials Co Ltd filed Critical Dowa Electronics Materials Co Ltd
Application granted granted Critical
Publication of DE60320695D1 publication Critical patent/DE60320695D1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
    • G11B5/70605—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material metals or alloys
    • G11B5/70621—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material metals or alloys containing Co metal or alloys
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/90—Magnetic feature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2991—Coated
DE60320695T 2002-03-07 2003-03-06 Magnetpulver für magnetisches Aufzeichnung Expired - Lifetime DE60320695D1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002061422A JP4143713B2 (ja) 2002-03-07 2002-03-07 磁気記録用の磁性粉

Publications (1)

Publication Number Publication Date
DE60320695D1 true DE60320695D1 (de) 2008-06-19

Family

ID=27751192

Family Applications (1)

Application Number Title Priority Date Filing Date
DE60320695T Expired - Lifetime DE60320695D1 (de) 2002-03-07 2003-03-06 Magnetpulver für magnetisches Aufzeichnung

Country Status (5)

Country Link
US (1) US7074281B2 (de)
EP (1) EP1343148B1 (de)
JP (1) JP4143713B2 (de)
CN (1) CN1326165C (de)
DE (1) DE60320695D1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4534085B2 (ja) * 2004-03-24 2010-09-01 Ｄｏｗａエレクトロニクス株式会社 高密度化に対応した塗布型磁気記録媒体用磁性粉末およびその製造方法
JP4296350B2 (ja) * 2004-08-23 2009-07-15 Ｄｏｗａエレクトロニクス株式会社 磁気記録媒体用非磁性粉末およびその製造方法ならびにこれを用いた磁気記録媒体
JP4779092B2 (ja) 2005-07-28 2011-09-21 Ｄｏｗａエレクトロニクス株式会社 低ノイズ媒体に適した磁性粉末
US20070087229A1 (en) * 2005-10-14 2007-04-19 Shinichi Konno Magnetic powder for magnetic recording medium
CN1971718B (zh) * 2005-11-23 2011-04-27 同和电子科技有限公司 用于磁记录介质的铁磁粉,该粉末的制备方法以及使用该粉末的磁记录介质
JP4758858B2 (ja) 2006-03-28 2011-08-31 Ｄｏｗａエレクトロニクス株式会社 磁気記録媒体用金属磁性粉末およびその製造法
US8430301B2 (en) * 2009-11-23 2013-04-30 Konica Minolta Laboratory U.S.A., Inc. Document authentication using hierarchical barcode stamps to detect alterations of barcode

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1069629A (ja) * 1996-08-27 1998-03-10 Dowa Mining Co Ltd 重層構造の塗布型磁気記録媒体
US6432503B2 (en) * 1997-03-31 2002-08-13 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6309479B1 (en) * 1998-11-05 2001-10-30 Toda Kogyo Corporation Spindle-shaped goethite particles, spindle-shaped hematite particles and magnetic spindle-shaped metal particles containing iron as main component
JP2001006147A (ja) 1999-06-23 2001-01-12 Fuji Photo Film Co Ltd 磁気記録媒体
JP3640577B2 (ja) 1999-09-13 2005-04-20 同和鉱業株式会社 磁性粉製造用先駆物質およびこれから得た強磁性金属粉末

Also Published As

Publication number Publication date
JP4143713B2 (ja) 2008-09-03
US20030168129A1 (en) 2003-09-11
US7074281B2 (en) 2006-07-11
EP1343148A2 (de) 2003-09-10
CN1326165C (zh) 2007-07-11
CN1444206A (zh) 2003-09-24
EP1343148B1 (de) 2008-05-07
JP2003263719A (ja) 2003-09-19
EP1343148A3 (de) 2003-12-17

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition