JPS56119934A - Magnetic recording medium and its production - Google Patents

Magnetic recording medium and its production

Info

Publication number
JPS56119934A
JPS56119934A JP2222280A JP2222280A JPS56119934A JP S56119934 A JPS56119934 A JP S56119934A JP 2222280 A JP2222280 A JP 2222280A JP 2222280 A JP2222280 A JP 2222280A JP S56119934 A JPS56119934 A JP S56119934A
Authority
JP
Japan
Prior art keywords
magnetic
disc
plate
magnetic recording
film
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
JP2222280A
Other languages
Japanese (ja)
Other versions
JPS615204B2 (en
Inventor
Masamitsu Kawakami
Yasuo Imaoka
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 JP2222280A priority Critical patent/JPS56119934A/en
Publication of JPS56119934A publication Critical patent/JPS56119934A/en
Publication of JPS615204B2 publication Critical patent/JPS615204B2/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
    • G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
    • G11B5/855—Coating only part of a support with a magnetic layer
    • 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)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

PURPOSE:To increase magnetic recording density by laminating a nonmangetic plate on the surface of a soft magnetic material disc, spirally etching off a part of this nonmagnetic disc, and burying a magnetic paint therein to provide a magnetic body. CONSTITUTION:The surface of a soft magnetic material disc 1 of mild iron or the like is closely adhered with a nonmagnetic plate 7 of copper, rigid plastics, etc. and is stuck with a photoresist film 11 for etching on the resulted surface is prepared. Next, a spiral light pattern is projected onto the film 11 by an optical means, after which part of the plate 7 is removed down to the surface of the disc 1 by an etchant, whereby spiral grooves 12 are formed. Next, the film 11 is removed, and a magnetic paint is filled in the grooves 12. Thereby, magnetic films suifted for vertical magnetization are perpendicuarly disposed in contact with the disc 1, the impression of magnetic field to the magnetic body is made efficient and the density of magnetic recording is increased.
JP2222280A 1980-02-26 1980-02-26 Magnetic recording medium and its production Granted JPS56119934A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2222280A JPS56119934A (en) 1980-02-26 1980-02-26 Magnetic recording medium and its production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2222280A JPS56119934A (en) 1980-02-26 1980-02-26 Magnetic recording medium and its production

Publications (2)

Publication Number Publication Date
JPS56119934A true JPS56119934A (en) 1981-09-19
JPS615204B2 JPS615204B2 (en) 1986-02-17

Family

ID=12076765

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2222280A Granted JPS56119934A (en) 1980-02-26 1980-02-26 Magnetic recording medium and its production

Country Status (1)

Country Link
JP (1) JPS56119934A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58125233A (en) * 1982-01-22 1983-07-26 Masamitsu Kawakami Magnetic recording body
US4746580A (en) * 1983-03-31 1988-05-24 International Business Machines Corporation Read-only magnetic recording media
EP1975704A2 (en) 2007-03-30 2008-10-01 Fujifilm Corporation Mold structure, imprinting method using the same, magnetic recording medium and production method thereof
EP1975703A2 (en) 2007-03-30 2008-10-01 Fujifilm Corporation Mold structure, imprinting method using the same, magnetic recording medium and production method thereof
US7850441B2 (en) 2006-12-05 2010-12-14 Fujifilm Corporation Mold structure
US7879468B2 (en) 2007-03-05 2011-02-01 Fuji Electric Device Technology Co., Ltd. Magnetic recording media and method of manufacture of the same
US8034413B2 (en) 2007-11-09 2011-10-11 Fuji Electric Co., Ltd. Method for manufacturing magnetic recording media
US8404130B2 (en) 2009-08-27 2013-03-26 Fuji Electric Co., Ltd. Method of manufacturing a discrete track medium type perpendicular magnetic recording medium

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58125233A (en) * 1982-01-22 1983-07-26 Masamitsu Kawakami Magnetic recording body
JPH0227729B2 (en) * 1982-01-22 1990-06-19 Masamitsu Kawakami
US4746580A (en) * 1983-03-31 1988-05-24 International Business Machines Corporation Read-only magnetic recording media
US7850441B2 (en) 2006-12-05 2010-12-14 Fujifilm Corporation Mold structure
US7879468B2 (en) 2007-03-05 2011-02-01 Fuji Electric Device Technology Co., Ltd. Magnetic recording media and method of manufacture of the same
EP1975704A2 (en) 2007-03-30 2008-10-01 Fujifilm Corporation Mold structure, imprinting method using the same, magnetic recording medium and production method thereof
EP1975703A2 (en) 2007-03-30 2008-10-01 Fujifilm Corporation Mold structure, imprinting method using the same, magnetic recording medium and production method thereof
US8034413B2 (en) 2007-11-09 2011-10-11 Fuji Electric Co., Ltd. Method for manufacturing magnetic recording media
US8470391B2 (en) 2007-11-09 2013-06-25 Fuji Electric Co., Ltd. Magnetic recording media
US8404130B2 (en) 2009-08-27 2013-03-26 Fuji Electric Co., Ltd. Method of manufacturing a discrete track medium type perpendicular magnetic recording medium

Also Published As

Publication number Publication date
JPS615204B2 (en) 1986-02-17

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