JPS56143532A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS56143532A
JPS56143532A JP4626980A JP4626980A JPS56143532A JP S56143532 A JPS56143532 A JP S56143532A JP 4626980 A JP4626980 A JP 4626980A JP 4626980 A JP4626980 A JP 4626980A JP S56143532 A JPS56143532 A JP S56143532A
Authority
JP
Japan
Prior art keywords
recording medium
coercive force
magnetic recording
mixed
magnetic
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
JP4626980A
Other languages
Japanese (ja)
Inventor
Hiroshi Kawahara
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.)
TDK Corp
Original Assignee
TDK 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 TDK Corp filed Critical TDK Corp
Priority to JP4626980A priority Critical patent/JPS56143532A/en
Priority to DE19813114646 priority patent/DE3114646A1/en
Publication of JPS56143532A publication Critical patent/JPS56143532A/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
    • G11B5/68—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
    • G11B5/716—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 two or more magnetic layers

Landscapes

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

Abstract

PURPOSE: To eliminate a fault, such as intermediate-frequency-range distortion, by using mixed magnetic powder for a two-layer-coat magnetic recording medium.
CONSTITUTION: On a nonmagnetic base, a lower magnetic layer of 3.0W6.0 microns in coating film thickness consisting of not less than two kinds of mixed magnetic powder having a coercive force of 400W560 Oe and a difference in coercive force of ≥80 oersted is provided, and on it, an upper magnetic layer of 1.5W 3.0 microns consisting of two kinds or more of mixed cabalt adsorbing τ-Fe2O3 magnetic powder having a coercive force of 590W800 Oe and a difference in coercive force of ≥80 Oe is provided to obtain a magnetic recording medium.
COPYRIGHT: (C)1981,JPO&Japio
JP4626980A 1980-04-10 1980-04-10 Magnetic recording medium Pending JPS56143532A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP4626980A JPS56143532A (en) 1980-04-10 1980-04-10 Magnetic recording medium
DE19813114646 DE3114646A1 (en) 1980-04-10 1981-04-10 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4626980A JPS56143532A (en) 1980-04-10 1980-04-10 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS56143532A true JPS56143532A (en) 1981-11-09

Family

ID=12742497

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4626980A Pending JPS56143532A (en) 1980-04-10 1980-04-10 Magnetic recording medium

Country Status (2)

Country Link
JP (1) JPS56143532A (en)
DE (1) DE3114646A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4500599A (en) * 1981-05-29 1985-02-19 Fuji Photo Film Co., Ltd. Magnetic recording medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4500599A (en) * 1981-05-29 1985-02-19 Fuji Photo Film Co., Ltd. Magnetic recording medium

Also Published As

Publication number Publication date
DE3114646A1 (en) 1982-04-08

Similar Documents

Publication Publication Date Title
JPS57133521A (en) Magnetic recording medium
JPS567233A (en) Magnetic recording medium
JPS5430002A (en) Magnetic recording medium using ffrromagnetic metal powders
JPS56145525A (en) Magnetic recording medium
JPS57109134A (en) Magnetic transferring and recording method
JPS5593514A (en) Magnetic card recording and reproducing device
JPS56143532A (en) Magnetic recording medium
JPS5733435A (en) Magnetic recording medium
JPS5256510A (en) Magnetic recording material
JPS5448504A (en) Magnetic recording medium
JPS5354002A (en) Magnetic recording medium
JPS56105338A (en) Magnetic card having forgery preventing function
JPS5671822A (en) Magnetic recording medium
JPS56127930A (en) Magnetic recording medium
JPS5654635A (en) Vertical magnetic recording medium
JPS57198535A (en) Magnetic recording medium
JPS5693123A (en) Magnetic recording material
JPS54143116A (en) Magnetic recording medium
JPS6479930A (en) Magnetic recording medium
JPS5769542A (en) Recording medium
JPS5736435A (en) Vertical magnetizing medium
JPS558618A (en) Magnetic recording medium
JPS57201004A (en) Magnetic recording medium
JPS5339705A (en) Magnetic recording medium
JPS5487516A (en) Magnetic head