JPS56130833A - Manufacture for magnetic disc - Google Patents

Manufacture for magnetic disc

Info

Publication number
JPS56130833A
JPS56130833A JP3220480A JP3220480A JPS56130833A JP S56130833 A JPS56130833 A JP S56130833A JP 3220480 A JP3220480 A JP 3220480A JP 3220480 A JP3220480 A JP 3220480A JP S56130833 A JPS56130833 A JP S56130833A
Authority
JP
Japan
Prior art keywords
magnetic
cro2
disc
manufacture
magnetic disc
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
JP3220480A
Other languages
Japanese (ja)
Inventor
Miyozou Maeda
Seiya Ogawa
Shoji Ishida
Tadatoshi Suenaga
Akira Minami
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP3220480A priority Critical patent/JPS56130833A/en
Publication of JPS56130833A publication Critical patent/JPS56130833A/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
    • G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
    • G11B5/82—Disk carriers

Landscapes

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

Abstract

PURPOSE:To form the guard track for magnetic disc, by using CrO2 as magnetic powder and excluding the magnetism by local heating process. CONSTITUTION:The magnetic paint including CrO2 is painted on the base 5 like aluminum and the magnetic film 6 is provided, and the parts of 8, 8' are made to nonmagnetizing in circular shape to constitute the guard band, while the disc is turned toward the arrow 9, by irradiating laser to the arrows 10, 10' for example, of the aid magnetic substance under nitrogen atmosphere to heat up at >=230 deg.C.
JP3220480A 1980-03-14 1980-03-14 Manufacture for magnetic disc Pending JPS56130833A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3220480A JPS56130833A (en) 1980-03-14 1980-03-14 Manufacture for magnetic disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3220480A JPS56130833A (en) 1980-03-14 1980-03-14 Manufacture for magnetic disc

Publications (1)

Publication Number Publication Date
JPS56130833A true JPS56130833A (en) 1981-10-14

Family

ID=12352367

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3220480A Pending JPS56130833A (en) 1980-03-14 1980-03-14 Manufacture for magnetic disc

Country Status (1)

Country Link
JP (1) JPS56130833A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003019540A1 (en) * 2001-08-23 2003-03-06 Hitachi, Ltd. Magnetic disk medium and production method thereof and magnetic recording device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003019540A1 (en) * 2001-08-23 2003-03-06 Hitachi, Ltd. Magnetic disk medium and production method thereof and magnetic recording device

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