JPS57198536A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS57198536A
JPS57198536A JP56081295A JP8129581A JPS57198536A JP S57198536 A JPS57198536 A JP S57198536A JP 56081295 A JP56081295 A JP 56081295A JP 8129581 A JP8129581 A JP 8129581A JP S57198536 A JPS57198536 A JP S57198536A
Authority
JP
Japan
Prior art keywords
layer
thickness
metal powder
nonmagnetic support
recording medium
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.)
Pending
Application number
JP56081295A
Other languages
Japanese (ja)
Inventor
Keisaburou Tozawa
Masashi Somezawa
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP56081295A priority Critical patent/JPS57198536A/en
Publication of JPS57198536A publication Critical patent/JPS57198536A/en
Pending 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
    • G11B5/73—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
    • G11B5/73923—Organic polymer substrates
    • G11B5/73927—Polyester substrates, e.g. polyethylene terephthalate
    • 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
    • G11B5/733—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 addition of non-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
    • G11B5/62—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
    • G11B5/73923—Organic polymer substrates
    • G11B5/73927—Polyester substrates, e.g. polyethylene terephthalate
    • G11B5/73929—Polyester substrates, e.g. polyethylene terephthalate comprising naphthalene ring compounds, e.g. polyethylene naphthalate substrates

Landscapes

  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

PURPOSE:To constitute a magnetic substance with very thin layer, by providing a subbing layer between a magnetic layer including a ferromagnetic metal powder and a nonmagnetic support. CONSTITUTION:On a nonmagnetic support such as polyethylene telephthalate, a subbing layer made of thermoplastic or thermosetting resin such as polyvinylchloride, binylidene chloride-acrylonitril copolymer, urethane rubber, chlorinated polypropylene, and mixture of polyvinyl formale and polyurethane, having about 0.5-5mu thickness. Further, a magnetic substance lalyer including feromagnetic metal powder, >= about 1,000 Oe of coercive force and <= about 2mu in thickness is provided on the background layer.
JP56081295A 1981-05-28 1981-05-28 Magnetic recording medium Pending JPS57198536A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56081295A JPS57198536A (en) 1981-05-28 1981-05-28 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56081295A JPS57198536A (en) 1981-05-28 1981-05-28 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS57198536A true JPS57198536A (en) 1982-12-06

Family

ID=13742388

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56081295A Pending JPS57198536A (en) 1981-05-28 1981-05-28 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57198536A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59223935A (en) * 1983-06-03 1984-12-15 Tdk Corp Magnetic recording medium
JPS60164926A (en) * 1984-02-08 1985-08-28 Hitachi Maxell Ltd Magnetic disk
JPS6173235A (en) * 1984-09-17 1986-04-15 Hitachi Maxell Ltd Magnetic recording medium
JPS6292132A (en) * 1985-10-18 1987-04-27 Fuji Photo Film Co Ltd Manufacture of magnetic recording medium
JPS63187418A (en) * 1987-01-30 1988-08-03 Fuji Photo Film Co Ltd Magnetic recording medium
EP0797190A1 (en) 1992-01-08 1997-09-24 Fuji Photo Film Co., Ltd. Magnetic recording medium
US5763046A (en) * 1991-01-21 1998-06-09 Fuji Photo Film Co., Ltd. Magnetic recording medium
US5792548A (en) * 1995-03-03 1998-08-11 Tdk Corporation Magnetic recording medium having a magnetic layer and an intermediate layer of specified composition
US5906885A (en) * 1995-03-28 1999-05-25 Tdk Corporation Magnetic recording medium

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4946406A (en) * 1972-09-05 1974-05-04
JPS5042813A (en) * 1973-08-20 1975-04-18
JPS51144604A (en) * 1975-06-09 1976-12-11 Fuji Photo Film Co Ltd Magnetic recorder process
JPS5243404A (en) * 1975-10-02 1977-04-05 Fuji Photo Film Co Ltd Magnetic recording media
JPS5256509A (en) * 1975-11-04 1977-05-10 Tdk Corp Magnetic recording material
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
JPS5572009A (en) * 1978-11-27 1980-05-30 Sony Corp Preparation of magnetic powder
JPS5613515A (en) * 1979-07-16 1981-02-09 Tdk Corp Magnetic recording medium

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4946406A (en) * 1972-09-05 1974-05-04
JPS5042813A (en) * 1973-08-20 1975-04-18
JPS51144604A (en) * 1975-06-09 1976-12-11 Fuji Photo Film Co Ltd Magnetic recorder process
JPS5243404A (en) * 1975-10-02 1977-04-05 Fuji Photo Film Co Ltd Magnetic recording media
JPS5256509A (en) * 1975-11-04 1977-05-10 Tdk Corp Magnetic recording material
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
JPS5572009A (en) * 1978-11-27 1980-05-30 Sony Corp Preparation of magnetic powder
JPS5613515A (en) * 1979-07-16 1981-02-09 Tdk Corp Magnetic recording medium

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59223935A (en) * 1983-06-03 1984-12-15 Tdk Corp Magnetic recording medium
JPH0533444B2 (en) * 1983-06-03 1993-05-19 Tdk Electronics Co Ltd
JPS60164926A (en) * 1984-02-08 1985-08-28 Hitachi Maxell Ltd Magnetic disk
JPS6173235A (en) * 1984-09-17 1986-04-15 Hitachi Maxell Ltd Magnetic recording medium
JPS6292132A (en) * 1985-10-18 1987-04-27 Fuji Photo Film Co Ltd Manufacture of magnetic recording medium
JPH0559490B2 (en) * 1985-10-18 1993-08-31 Fuji Photo Film Co Ltd
JPS63187418A (en) * 1987-01-30 1988-08-03 Fuji Photo Film Co Ltd Magnetic recording medium
US5763046A (en) * 1991-01-21 1998-06-09 Fuji Photo Film Co., Ltd. Magnetic recording medium
US5811172A (en) * 1991-01-21 1998-09-22 Fuji Photo Film Co., Ltd. Magnetic recording medium
US5985408A (en) * 1991-01-21 1999-11-16 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6015602A (en) * 1991-01-21 2000-01-18 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6020022A (en) * 1991-01-21 2000-02-01 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6025082A (en) * 1991-01-21 2000-02-15 Fuji Photo Film Co., Ltd. Magnetic recording medium
EP0797190A1 (en) 1992-01-08 1997-09-24 Fuji Photo Film Co., Ltd. Magnetic recording medium
US5792548A (en) * 1995-03-03 1998-08-11 Tdk Corporation Magnetic recording medium having a magnetic layer and an intermediate layer of specified composition
US5906885A (en) * 1995-03-28 1999-05-25 Tdk Corporation Magnetic recording medium

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