JPS6419524A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS6419524A
JPS6419524A JP7761087A JP7761087A JPS6419524A JP S6419524 A JPS6419524 A JP S6419524A JP 7761087 A JP7761087 A JP 7761087A JP 7761087 A JP7761087 A JP 7761087A JP S6419524 A JPS6419524 A JP S6419524A
Authority
JP
Japan
Prior art keywords
recording medium
ferromagnetic
major axis
axis length
crystallite size
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
JP7761087A
Other languages
Japanese (ja)
Other versions
JPH0690786B2 (en
Inventor
Hiroshi Ogawa
Hiroaki Araki
Toshihiko Miura
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co 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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP62077610A priority Critical patent/JPH0690786B2/en
Priority to US07/150,860 priority patent/US4851289A/en
Publication of JPS6419524A publication Critical patent/JPS6419524A/en
Publication of JPH0690786B2 publication Critical patent/JPH0690786B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To obtain a recording medium having excellent electromagnetic conversion characteristics and good wear resistance and durability by specifying the average major axis length and crystallite size of the ferromagnetic alloy powder in plural magnetic layers of the magnetic recording medium. CONSTITUTION:The plural magnetic layers formed by dispersing the ferromagnetic powder in a binder are provided on a nonmagnetic base. The ferromagnetic alloy powder of the uppermost layer thereof is formed to have <0.25mum average major axis length by a transmission type electron microscope and <200Angstrom crystallite size by an X-ray diffraction method. The average major axis length of the ferromagnetic powder except in the uppermost layer is specified to >=0.25mum and the crystallite size to >=250Angstrom . The recording medium having the excellent electromagnetic conversion characteristics and the good wear resistance and durability is obtd. by using the ferromagnetic powders having such lengths and sizes.
JP62077610A 1987-01-30 1987-04-01 Magnetic recording medium Expired - Fee Related JPH0690786B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP62077610A JPH0690786B2 (en) 1987-01-30 1987-04-01 Magnetic recording medium
US07/150,860 US4851289A (en) 1987-01-30 1988-02-01 Magnetic recording medium

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP1863587 1987-01-30
JP62-18635 1987-01-30
JP62077610A JPH0690786B2 (en) 1987-01-30 1987-04-01 Magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS6419524A true JPS6419524A (en) 1989-01-23
JPH0690786B2 JPH0690786B2 (en) 1994-11-14

Family

ID=26355340

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62077610A Expired - Fee Related JPH0690786B2 (en) 1987-01-30 1987-04-01 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPH0690786B2 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0388120A (en) * 1989-08-30 1991-04-12 Konica Corp Magnetic recording medium
JPH03102631A (en) * 1989-09-14 1991-04-30 Konica Corp Magnetic recording medium
JPH03203021A (en) * 1989-12-28 1991-09-04 Konica Corp Magnetic recording medium
EP0493114A2 (en) 1990-12-28 1992-07-01 Konica Corporation Magnetic recording medium
JPH04238111A (en) * 1991-01-21 1992-08-26 Fuji Photo Film Co Ltd Magnetic recording medium
JPH04298819A (en) * 1991-03-27 1992-10-22 Fuji Photo Film Co Ltd Magnetic recording medium and reproduction thereof
US5252392A (en) * 1991-07-05 1993-10-12 Konica Corporation Magnetic recording medium comprising multiple magnetic layers with specified composition and properties
US5547772A (en) * 1991-04-19 1996-08-20 Fuji Photo Film Co., Ltd. Magnetic recording medium
EP0390391B2 (en) † 1989-03-28 2000-12-20 Konica Corporation A magnetic recording medium with improved electromagnetic conversion characteristics and anti-environment properties

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1417765A (en) * 1972-02-24 1975-12-17
JPS5256508A (en) * 1975-11-05 1977-05-10 Fuji Photo Film Co Ltd Novel magnetic recording medium
JPS54145104A (en) * 1978-04-30 1979-11-13 Hitachi Maxell Magnetic recording medium
JPS5612937A (en) * 1979-07-10 1981-02-07 Chugai Ro Kogyo Kaisha Ltd Method of controlling temperature and humidity for air conditioning system
JPS5717291A (en) * 1981-04-01 1982-01-28 Hitachi Denshi Ltd High level chroma killer system for color television camera
JPS5856231A (en) * 1981-09-29 1983-04-02 Sony Corp Magnetic recording medium
JPS59172142A (en) * 1983-03-20 1984-09-28 Hitachi Maxell Ltd Magnetic recording medium
JPS60157724A (en) * 1984-01-25 1985-08-19 Hitachi Maxell Ltd Multi-layer magnetic recording tape
JPS6122428A (en) * 1984-06-20 1986-01-31 バイエル・アクチエンゲゼルシヤフト Manufacture and use of ferromagnetic pigment

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1417765A (en) * 1972-02-24 1975-12-17
JPS5256508A (en) * 1975-11-05 1977-05-10 Fuji Photo Film Co Ltd Novel magnetic recording medium
JPS54145104A (en) * 1978-04-30 1979-11-13 Hitachi Maxell Magnetic recording medium
JPS5612937A (en) * 1979-07-10 1981-02-07 Chugai Ro Kogyo Kaisha Ltd Method of controlling temperature and humidity for air conditioning system
JPS5717291A (en) * 1981-04-01 1982-01-28 Hitachi Denshi Ltd High level chroma killer system for color television camera
JPS5856231A (en) * 1981-09-29 1983-04-02 Sony Corp Magnetic recording medium
JPS59172142A (en) * 1983-03-20 1984-09-28 Hitachi Maxell Ltd Magnetic recording medium
JPS60157724A (en) * 1984-01-25 1985-08-19 Hitachi Maxell Ltd Multi-layer magnetic recording tape
JPS6122428A (en) * 1984-06-20 1986-01-31 バイエル・アクチエンゲゼルシヤフト Manufacture and use of ferromagnetic pigment

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0390391B2 (en) † 1989-03-28 2000-12-20 Konica Corporation A magnetic recording medium with improved electromagnetic conversion characteristics and anti-environment properties
JPH0388120A (en) * 1989-08-30 1991-04-12 Konica Corp Magnetic recording medium
JPH03102631A (en) * 1989-09-14 1991-04-30 Konica Corp Magnetic recording medium
JPH03203021A (en) * 1989-12-28 1991-09-04 Konica Corp Magnetic recording medium
EP0493114A2 (en) 1990-12-28 1992-07-01 Konica Corporation Magnetic recording medium
JPH04238111A (en) * 1991-01-21 1992-08-26 Fuji Photo Film Co Ltd Magnetic recording medium
JPH04298819A (en) * 1991-03-27 1992-10-22 Fuji Photo Film Co Ltd Magnetic recording medium and reproduction thereof
US5547772A (en) * 1991-04-19 1996-08-20 Fuji Photo Film Co., Ltd. Magnetic recording medium
US5252392A (en) * 1991-07-05 1993-10-12 Konica Corporation Magnetic recording medium comprising multiple magnetic layers with specified composition and properties

Also Published As

Publication number Publication date
JPH0690786B2 (en) 1994-11-14

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Legal Events

Date Code Title Description
R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees