JPS58139337A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS58139337A
JPS58139337A JP2158682A JP2158682A JPS58139337A JP S58139337 A JPS58139337 A JP S58139337A JP 2158682 A JP2158682 A JP 2158682A JP 2158682 A JP2158682 A JP 2158682A JP S58139337 A JPS58139337 A JP S58139337A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
magnetic
magnetic layer
contg
needlelike
squareness
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
JP2158682A
Inventor
Shigeo Aoyama
Kazuto Karashima
Fumio Togawa
Hiroshi Zaitsu
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

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62Record carriers characterised by the selection of the material
    • G11B5/68Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70Record 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
    • G11B5/716Record 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

Abstract

PURPOSE:To enable high density recording by laminating a magnetic layer contg. magnetic iron oxide powder and oriented in the horizontal direction and a magnetic layer contg. magnetic needlelike metallic powder and oriented in the vertical direction. CONSTITUTION:A magnetic coating consisting essentially of magnetic iron oxide powder of gamma-Fe2O3, gamma-Fe2O3 contg. Co or the like, a binder resin and a solvent is applied to a substrate such as a polyester film and dried after carrying out orientation in a magnetic field so as to provide >=0.7 squareness in the horizontal direction of the resulting magnetic layer. A magnetic coating consisting essentially of magnetic needlelike metallic powder of Fe, Co or the like, a binder resin and a solvent is then applied to the magnetic layer and dried while carrying out orientation in the vertical direction in a vertical magnetic field so as to provide >=0.4 squareness.
JP2158682A 1982-02-13 1982-02-13 Magnetic recording medium Pending JPS58139337A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2158682A JPS58139337A (en) 1982-02-13 1982-02-13 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2158682A JPS58139337A (en) 1982-02-13 1982-02-13 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS58139337A true true JPS58139337A (en) 1983-08-18

Family

ID=12059136

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2158682A Pending JPS58139337A (en) 1982-02-13 1982-02-13 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS58139337A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02110823A (en) * 1988-10-19 1990-04-24 Fuji Photo Film Co Ltd Magnetic recording medium
JPH07326038A (en) * 1995-06-21 1995-12-12 Fuji Photo Film Co Ltd Magnetic recording media
US5763046A (en) * 1991-01-21 1998-06-09 Fuji Photo Film Co., Ltd. Magnetic recording medium
US5827600A (en) * 1991-01-21 1998-10-27 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6096406A (en) * 1997-07-15 2000-08-01 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6203934B1 (en) 1997-10-14 2001-03-20 Fui Photo Film Co., Ltd. Magnetic recording medium
US6254964B1 (en) 1997-02-10 2001-07-03 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6291052B1 (en) 1997-06-30 2001-09-18 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6316077B1 (en) 1998-06-22 2001-11-13 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6432503B2 (en) 1997-03-31 2002-08-13 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6444290B1 (en) 1998-06-11 2002-09-03 Fuji Photo Film Co., Ltd. Magnetic recording medium comprising a support containing a specific size filler and having a specific concentration of surface protrusions
US6579592B1 (en) 1996-11-29 2003-06-17 Fuji Photo Film Co., Ltd Magnetic recording tape with controlled Hc and magnetic flux/unit area value and controlled Cl/Fe intensity

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02110823A (en) * 1988-10-19 1990-04-24 Fuji Photo Film Co Ltd Magnetic recording medium
US5851622A (en) * 1991-01-21 1998-12-22 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6025082A (en) * 1991-01-21 2000-02-15 Fuji Photo Film Co., Ltd. Magnetic recording medium
US5763046A (en) * 1991-01-21 1998-06-09 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6015602A (en) * 1991-01-21 2000-01-18 Fuji Photo Film Co., Ltd. Magnetic recording medium
US5811172A (en) * 1991-01-21 1998-09-22 Fuji Photo Film Co., Ltd. Magnetic recording medium
US5811166A (en) * 1991-01-21 1998-09-22 Fuji Photo Film Co., Ltd. Magnetic recording medium
US5827600A (en) * 1991-01-21 1998-10-27 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6020022A (en) * 1991-01-21 2000-02-01 Fuji Photo Film Co., Ltd. Magnetic recording medium
US5792543A (en) * 1991-04-25 1998-08-11 Fuji Photo Film Co., Ltd. Magnetic recording medium
US5780141A (en) * 1991-04-25 1998-07-14 Fuji Photo Film Co., Ltd. Magnetic recording medium
JPH07326038A (en) * 1995-06-21 1995-12-12 Fuji Photo Film Co Ltd Magnetic recording media
US6579592B1 (en) 1996-11-29 2003-06-17 Fuji Photo Film Co., Ltd Magnetic recording tape with controlled Hc and magnetic flux/unit area value and controlled Cl/Fe intensity
US6254964B1 (en) 1997-02-10 2001-07-03 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6432503B2 (en) 1997-03-31 2002-08-13 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6291052B1 (en) 1997-06-30 2001-09-18 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6096406A (en) * 1997-07-15 2000-08-01 Fuji Photo Film Co., Ltd. Magnetic recording medium
US6203934B1 (en) 1997-10-14 2001-03-20 Fui Photo Film Co., Ltd. Magnetic recording medium
US6444290B1 (en) 1998-06-11 2002-09-03 Fuji Photo Film Co., Ltd. Magnetic recording medium comprising a support containing a specific size filler and having a specific concentration of surface protrusions
US6316077B1 (en) 1998-06-22 2001-11-13 Fuji Photo Film Co., Ltd. Magnetic recording medium

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