JPS57189336A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS57189336A
JPS57189336A JP56074657A JP7465781A JPS57189336A JP S57189336 A JPS57189336 A JP S57189336A JP 56074657 A JP56074657 A JP 56074657A JP 7465781 A JP7465781 A JP 7465781A JP S57189336 A JPS57189336 A JP S57189336A
Authority
JP
Japan
Prior art keywords
powder
resin
thin film
reverse side
mohs hardness
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
JP56074657A
Other languages
Japanese (ja)
Inventor
Tsunemi Oiwa
Atsutaka Yamaguchi
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
Application filed by Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Priority to JP56074657A priority Critical patent/JPS57189336A/en
Publication of JPS57189336A publication Critical patent/JPS57189336A/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
    • G11B5/735—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 back layer
    • G11B5/7356—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 back layer comprising non-magnetic particles in the back layer, e.g. particles of TiO2, ZnO or SiO2
    • G11B5/7358—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 back layer comprising non-magnetic particles in the back layer, e.g. particles of TiO2, ZnO or SiO2 specially adapted for achieving a specific property, e.g. average roughness [Ra]

Abstract

PURPOSE:To get rid of generation of curl, and also to elevate running stability, by providing a back coating layer containing nonmagnetic powder whose Mohs hardness is <=5, in specific resin, on the reverse side of a base body on which a ferromagnetic metallic thin film layer has been formed by means of vapor deposition. CONSTITUTION:On the reverse side of the base of a polyester film, etc. having on the surface a ferromagnetic metallic thin film layer formed by means of vapor-deposition of cobalt, etc., a layer consisting of at least one resin selected from an acrylonitrile-butadiene-styrene copolymer, polystyrene resin, acrylic resin, vinyl chloride-vinyl acetate copolymer, polyvinyl acetal resin, and cellulose resin, and nonmagnetic powder whose Mohs hardness is <=5, such as CaCO3 powder, Mg-O powder, BaCO3 powder, ZnO powder, Cu2O powder, CuO powder, MoS2 powder, WS2 powder, etc. is provided.
JP56074657A 1981-05-18 1981-05-18 Magnetic recording medium Pending JPS57189336A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56074657A JPS57189336A (en) 1981-05-18 1981-05-18 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56074657A JPS57189336A (en) 1981-05-18 1981-05-18 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS57189336A true JPS57189336A (en) 1982-11-20

Family

ID=13553516

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56074657A Pending JPS57189336A (en) 1981-05-18 1981-05-18 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57189336A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59168931A (en) * 1983-03-15 1984-09-22 Fuji Photo Film Co Ltd Magnetic recording medium
JPS59172158A (en) * 1983-03-18 1984-09-28 Hitachi Maxell Ltd Magnetic recording medium
JPS59174489A (en) * 1978-07-17 1984-10-02 ハレン・カンパニ− Corkscrew
JPS59175027A (en) * 1983-03-23 1984-10-03 Matsushita Electric Ind Co Ltd Magnetic recording medium
JPS6264545A (en) * 1985-05-29 1987-03-23 帝人株式会社 Polyester film for metallic thin-film magnetic record medium
JPH05223298A (en) * 1992-02-13 1993-08-31 Mitsubishi Electric Corp Ventilation system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50114205A (en) * 1974-02-15 1975-09-08
JPS53107315A (en) * 1977-03-01 1978-09-19 Matsushita Electric Ind Co Ltd Magnetic recording method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50114205A (en) * 1974-02-15 1975-09-08
JPS53107315A (en) * 1977-03-01 1978-09-19 Matsushita Electric Ind Co Ltd Magnetic recording method

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59174489A (en) * 1978-07-17 1984-10-02 ハレン・カンパニ− Corkscrew
JPH0156992B2 (en) * 1978-07-17 1989-12-04 Hallen Co
JPS59168931A (en) * 1983-03-15 1984-09-22 Fuji Photo Film Co Ltd Magnetic recording medium
JPS59172158A (en) * 1983-03-18 1984-09-28 Hitachi Maxell Ltd Magnetic recording medium
JPH0574129B2 (en) * 1983-03-18 1993-10-15 Hitachi Maxell
JPS59175027A (en) * 1983-03-23 1984-10-03 Matsushita Electric Ind Co Ltd Magnetic recording medium
JPS6264545A (en) * 1985-05-29 1987-03-23 帝人株式会社 Polyester film for metallic thin-film magnetic record medium
JPH0433273B2 (en) * 1985-05-29 1992-06-02 Teijin Ltd
JPH05223298A (en) * 1992-02-13 1993-08-31 Mitsubishi Electric Corp Ventilation system

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