JPS57135436A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS57135436A
JPS57135436A JP56020388A JP2038881A JPS57135436A JP S57135436 A JPS57135436 A JP S57135436A JP 56020388 A JP56020388 A JP 56020388A JP 2038881 A JP2038881 A JP 2038881A JP S57135436 A JPS57135436 A JP S57135436A
Authority
JP
Japan
Prior art keywords
needle
recording medium
magnetic recording
ratio
alloy powder
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
JP56020388A
Other languages
Japanese (ja)
Other versions
JPH0373051B2 (en
Inventor
Ryoji Nakabachi
Naoko Kawamura
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 JP56020388A priority Critical patent/JPS57135436A/en
Publication of JPS57135436A publication Critical patent/JPS57135436A/en
Publication of JPH0373051B2 publication Critical patent/JPH0373051B2/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

Landscapes

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

Abstract

PURPOSE:To record short wave of <=1mu and also to obtain a sufficient high output, by using ferromagnetic needle-like alloy powder having specific mean long axial diameter and needle-like ratio. CONSTITUTION:A magnetic recording medium is obtained by applying a magnetic coating material containing ferromagnetic needle-like alloy powder which contains Fe, Fe-Co, Fe-Co-Ni, etc. or an element of a small quantity added to them, and has coercive force of about 700-2,000 oersted, mean long axial diameter (a) of lambda/2.28 (where lambda denotes center recording wavelength and <=1mu), and needle-like ratio of 10, on the base film.
JP56020388A 1981-02-14 1981-02-14 Magnetic recording medium Granted JPS57135436A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56020388A JPS57135436A (en) 1981-02-14 1981-02-14 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56020388A JPS57135436A (en) 1981-02-14 1981-02-14 Magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS57135436A true JPS57135436A (en) 1982-08-21
JPH0373051B2 JPH0373051B2 (en) 1991-11-20

Family

ID=12025632

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56020388A Granted JPS57135436A (en) 1981-02-14 1981-02-14 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57135436A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5975432A (en) * 1982-10-22 1984-04-28 Fuji Photo Film Co Ltd Magnetic recording body
JPS59167854A (en) * 1983-03-14 1984-09-21 Hitachi Maxell Ltd Magnetic recording medium
JPS59201218A (en) * 1983-04-28 1984-11-14 Fuji Photo Film Co Ltd Magnetic recording medium
JPS6174137A (en) * 1984-09-19 1986-04-16 Hitachi Maxell Ltd Magnetic disk
JPH0666597U (en) * 1991-11-07 1994-09-20 二郎 伊藤 Press tool
US6309479B1 (en) 1998-11-05 2001-10-30 Toda Kogyo Corporation Spindle-shaped goethite particles, spindle-shaped hematite particles and magnetic spindle-shaped metal particles containing iron as main component

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5529577A (en) * 1978-08-16 1980-03-01 Bayer Ag Production of titanium dioxide pigment

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5529577A (en) * 1978-08-16 1980-03-01 Bayer Ag Production of titanium dioxide pigment

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5975432A (en) * 1982-10-22 1984-04-28 Fuji Photo Film Co Ltd Magnetic recording body
JPH0479059B2 (en) * 1982-10-22 1992-12-14 Fuji Photo Film Co Ltd
JPS59167854A (en) * 1983-03-14 1984-09-21 Hitachi Maxell Ltd Magnetic recording medium
JPS59201218A (en) * 1983-04-28 1984-11-14 Fuji Photo Film Co Ltd Magnetic recording medium
JPH0479063B2 (en) * 1983-04-28 1992-12-14 Fuji Photo Film Co Ltd
JPS6174137A (en) * 1984-09-19 1986-04-16 Hitachi Maxell Ltd Magnetic disk
JPH0666597U (en) * 1991-11-07 1994-09-20 二郎 伊藤 Press tool
US6309479B1 (en) 1998-11-05 2001-10-30 Toda Kogyo Corporation Spindle-shaped goethite particles, spindle-shaped hematite particles and magnetic spindle-shaped metal particles containing iron as main component
US6398863B1 (en) 1998-11-05 2002-06-04 Toda Kogyo Corporation Spindle-shaped hematite particles and process for making spindle-shaped hematite particles

Also Published As

Publication number Publication date
JPH0373051B2 (en) 1991-11-20

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