JPS57143733A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS57143733A
JPS57143733A JP56028487A JP2848781A JPS57143733A JP S57143733 A JPS57143733 A JP S57143733A JP 56028487 A JP56028487 A JP 56028487A JP 2848781 A JP2848781 A JP 2848781A JP S57143733 A JPS57143733 A JP S57143733A
Authority
JP
Japan
Prior art keywords
recording medium
characteristic
magnetic powder
mum
needle
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.)
Granted
Application number
JP56028487A
Other languages
Japanese (ja)
Other versions
JPH038015B2 (en
Inventor
Kazuyoshi Yoshida
Hideo Fujiwara
Seiichi Asada
Masahiro Amamiya
Seiji Wataya
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.)
Hitachi Ltd
Maxell Holdings Ltd
Original Assignee
Hitachi Ltd
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 Ltd, Hitachi Maxell Ltd filed Critical Hitachi Ltd
Priority to JP56028487A priority Critical patent/JPS57143733A/en
Publication of JPS57143733A publication Critical patent/JPS57143733A/en
Publication of JPH038015B2 publication Critical patent/JPH038015B2/ja
Granted 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
    • G11B5/70615—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 Fe metal or alloys

Abstract

PURPOSE:To elevate the C/N characteristic of a magnetic recording medium, by prescribing particle size of needle-like alloy magnetic powder mainly consisting of iron, to be applied onto a nonmagnetic base material, a magnetic characteristic and surface roughness of the recording medium. CONSTITUTION:On a nonmagnetic base body, needle-like alloy magnetic powder mainly consisting of iron, which has >=11,000e coercive force, is equal to or smaller than a point on a curve shown by long axis length l (mean value by simple addition, and unit is mum) in the figure, or preferably on a curve shown by l=0.062XRZ<-0.48>, and is 0.1mum in its lower limit is applied so that surface roughness RZ (peak-to-peak value, unit is mum) of the surface of the painting film becomes 0.08-0.025mump-p. In this way, the C/N characteristic is elevated by 3dB or 5dB or more, comparing with a tape on which Co adhesion type gamma-Fe2O3 magnetic powder is applied.
JP56028487A 1981-03-02 1981-03-02 Magnetic recording medium Granted JPS57143733A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56028487A JPS57143733A (en) 1981-03-02 1981-03-02 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56028487A JPS57143733A (en) 1981-03-02 1981-03-02 Magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS57143733A true JPS57143733A (en) 1982-09-06
JPH038015B2 JPH038015B2 (en) 1991-02-05

Family

ID=12250018

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56028487A Granted JPS57143733A (en) 1981-03-02 1981-03-02 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57143733A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59142742A (en) * 1983-02-04 1984-08-16 Fuji Photo Film Co Ltd Magnetic recording medium
JPS59203224A (en) * 1983-05-02 1984-11-17 Fuji Photo Film Co Ltd Magnetic recording medium
JPS6066319A (en) * 1983-09-22 1985-04-16 Tdk Corp Magnetic recording medium
JPH03116416A (en) * 1990-04-27 1991-05-17 Hitachi Ltd Production of magnetic disk medium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54159203A (en) * 1978-06-07 1979-12-15 Fuji Photo Film Co Ltd Audio magnetic recording tape
JPS5677931A (en) * 1979-11-28 1981-06-26 Tdk Corp Magnetic recording medium and its producton

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54159203A (en) * 1978-06-07 1979-12-15 Fuji Photo Film Co Ltd Audio magnetic recording tape
JPS5677931A (en) * 1979-11-28 1981-06-26 Tdk Corp Magnetic recording medium and its producton

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59142742A (en) * 1983-02-04 1984-08-16 Fuji Photo Film Co Ltd Magnetic recording medium
JPS59203224A (en) * 1983-05-02 1984-11-17 Fuji Photo Film Co Ltd Magnetic recording medium
JPH0479046B2 (en) * 1983-05-02 1992-12-14 Fuji Photo Film Co Ltd
JPS6066319A (en) * 1983-09-22 1985-04-16 Tdk Corp Magnetic recording medium
JPH03116416A (en) * 1990-04-27 1991-05-17 Hitachi Ltd Production of magnetic disk medium
JPH05765B2 (en) * 1990-04-27 1993-01-06 Hitachi Ltd

Also Published As

Publication number Publication date
JPH038015B2 (en) 1991-02-05

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