DE3274915D1 - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
DE3274915D1
DE3274915D1 DE8282108808T DE3274915T DE3274915D1 DE 3274915 D1 DE3274915 D1 DE 3274915D1 DE 8282108808 T DE8282108808 T DE 8282108808T DE 3274915 T DE3274915 T DE 3274915T DE 3274915 D1 DE3274915 D1 DE 3274915D1
Authority
DE
Germany
Prior art keywords
recording medium
magnetic recording
magnetic
medium
recording
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
Application number
DE8282108808T
Other languages
English (en)
Inventor
Fumio Togawa
Takato View Heights Karashima
Hiroshi Zaitsu
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.)
Maxell Holdings Ltd
Original Assignee
Hitachi Maxell 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=15519181&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE3274915(D1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Application granted granted Critical
Publication of DE3274915D1 publication Critical patent/DE3274915D1/de
Expired 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
    • G11B5/714—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 dimension of the magnetic particles
    • 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
    • G11B5/842—Coating a support with a liquid magnetic dispersion
    • 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
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/256—Heavy metal or aluminum or compound thereof
    • 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
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/256—Heavy metal or aluminum or compound thereof
    • Y10T428/257—Iron oxide or aluminum oxide
    • 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
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Magnetic Record Carriers (AREA)
  • Paints Or Removers (AREA)
DE8282108808T 1981-09-24 1982-09-23 Magnetic recording medium Expired DE3274915D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56151468A JPS5853022A (ja) 1981-09-24 1981-09-24 磁気記録媒体

Publications (1)

Publication Number Publication Date
DE3274915D1 true DE3274915D1 (en) 1987-02-05

Family

ID=15519181

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8282108808T Expired DE3274915D1 (en) 1981-09-24 1982-09-23 Magnetic recording medium

Country Status (4)

Country Link
US (1) US4480004A (de)
EP (1) EP0075870B1 (de)
JP (1) JPS5853022A (de)
DE (1) DE3274915D1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57154618A (en) * 1981-03-19 1982-09-24 Sony Corp Magnetic recording medium
JPS5979431A (ja) * 1982-10-29 1984-05-08 Konishiroku Photo Ind Co Ltd 磁気記録媒体
JPS60111329A (ja) * 1983-11-21 1985-06-17 Fuji Photo Film Co Ltd 磁気記録媒体
JPS61188702A (ja) * 1985-02-18 1986-08-22 Matsushita Electric Ind Co Ltd 磁気記録再生装置
DE3637805A1 (de) * 1985-11-06 1987-07-16 Tdk Corp Magnetischer aufzeichnungstraeger
US5989674A (en) * 1998-05-15 1999-11-23 International Business Machines Corporation Thin film disk with acicular magnetic grains
DE19942939A1 (de) * 1999-09-08 2001-03-15 Siemens Ag Weichmagnetische Folie und Verfahren zu deren Herstellung

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3567525A (en) 1968-06-25 1971-03-02 Du Pont Heat treated ferromagnetic particles
DE1931664B2 (de) * 1968-06-25 1971-04-15 E I Du Pont de Nemours and Co , Wilmington, Del (V St A ) Ferromagnetische teilchen
US3865627A (en) 1972-05-22 1975-02-11 Minnesota Mining & Mfg Magnetic recording medium incorporating fine acicular iron-based particles
JPS604565B2 (ja) * 1974-11-21 1985-02-05 富士写真フイルム株式会社 耐食性強磁性金属粉末
JPS5814729B2 (ja) * 1975-08-01 1983-03-22 富士写真フイルム株式会社 キヨウジセイフンマツノセイゾウホウホウ
FR2353110A1 (fr) * 1976-03-12 1977-12-23 Kodak Pathe Nouveau produit d'enregistrement magnetique et procede pour sa preparation
JPS52125306A (en) 1976-04-13 1977-10-21 Fuji Photo Film Co Ltd Production of magnetic recording media
JPS5370397A (en) * 1976-12-06 1978-06-22 Fuji Photo Film Co Ltd Strongly magnetic metallic powder, preparation of same and magneticrecording media emplying same
FR2382325A1 (fr) * 1977-03-02 1978-09-29 Kodak Pathe Produit comprenant une couche d'enregistrement magnetique transparente
US4101311A (en) * 1977-08-01 1978-07-18 Fuji Photo Film Co., Ltd. Process for producing ferromagnetic metal powder
US4237506A (en) 1978-04-03 1980-12-02 Graham Magnetics Inc. Polymodal magnetic recording member
DE2909480A1 (de) 1979-03-10 1980-09-11 Bayer Ag Ferromagnetisches, im wesentlichen aus eisen bestehendes metallpigment und verfahren zu dessen herstellung
JPS6016728B2 (ja) * 1979-05-10 1985-04-27 ソニー株式会社 磁性粉の製法
JPS5923009B2 (ja) * 1979-06-26 1984-05-30 日本ビクター株式会社 磁気記録媒体
JPS5677927A (en) * 1979-11-28 1981-06-26 Fuji Photo Film Co Ltd Magnetic recording medium
JPS57154618A (en) * 1981-03-19 1982-09-24 Sony Corp Magnetic recording medium
JPS57183626A (en) * 1981-05-07 1982-11-12 Fuji Photo Film Co Ltd Magnetic recording medium

Also Published As

Publication number Publication date
JPH0353688B2 (de) 1991-08-15
EP0075870B1 (de) 1986-12-30
US4480004A (en) 1984-10-30
EP0075870A3 (en) 1984-09-12
EP0075870A2 (de) 1983-04-06
JPS5853022A (ja) 1983-03-29

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Legal Events

Date Code Title Description
8363 Opposition against the patent
8331 Complete revocation