JPS5567940A - Magnetic recording medium and its manufacture - Google Patents

Magnetic recording medium and its manufacture

Info

Publication number
JPS5567940A
JPS5567940A JP13889078A JP13889078A JPS5567940A JP S5567940 A JPS5567940 A JP S5567940A JP 13889078 A JP13889078 A JP 13889078A JP 13889078 A JP13889078 A JP 13889078A JP S5567940 A JPS5567940 A JP S5567940A
Authority
JP
Japan
Prior art keywords
powder
solution
magnetic
polyhedral
spherical
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
JP13889078A
Other languages
Japanese (ja)
Inventor
Yasutaro Kamisaka
Hideo Fujiwara
Sanehiro Kudo
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.)
Hitachi Ltd
Maxell Holdings Ltd
Original Assignee
Hitachi Ltd
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
Application filed by Hitachi Ltd, Hitachi Maxell Ltd filed Critical Hitachi Ltd
Priority to JP13889078A priority Critical patent/JPS5567940A/en
Publication of JPS5567940A publication Critical patent/JPS5567940A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To realize easily high-density recording on a magnetic recording medium used for a vertical magnetizing recording system, by making an easy-to-magnetize axis perpendicular to a medium surface by using spherical or polyhedral magnetic power.
CONSTITUTION: For example, a solution of NaOH is deopped into that of FeSO4. 7H2O and after heating, a solution of KNO3 is dropped; after boiling by heating, the solution is left and the preciptates are sufficiently rinsed by decantation and then dried to obtain polyhedral Fe3O4 powder. This powder and polyvinyl butyral are dispersed in a mixing solution of toluene and methyl isobutyl ketone to obtain a coating solution. This coating solution is applied on a Mylar tape and a direct- current magnetic field of 20000e is applied with its direction perpendicular to the tape surface to manufacture a magnetic tape. As well as spherical or polyhedral magnetic powder, Co-added Fe2O3 powder, etc., are used. Althought it is hard by needle-shape magnetic powder to fix an easy-to-magnetize axis in a vertical direction, it is easy by spherical or polyhedral one.
COPYRIGHT: (C)1980,JPO&Japio
JP13889078A 1978-11-13 1978-11-13 Magnetic recording medium and its manufacture Pending JPS5567940A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13889078A JPS5567940A (en) 1978-11-13 1978-11-13 Magnetic recording medium and its manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13889078A JPS5567940A (en) 1978-11-13 1978-11-13 Magnetic recording medium and its manufacture

Publications (1)

Publication Number Publication Date
JPS5567940A true JPS5567940A (en) 1980-05-22

Family

ID=15232501

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13889078A Pending JPS5567940A (en) 1978-11-13 1978-11-13 Magnetic recording medium and its manufacture

Country Status (1)

Country Link
JP (1) JPS5567940A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5754302U (en) * 1980-09-17 1982-03-30
JPS57200936A (en) * 1981-06-03 1982-12-09 Hitachi Maxell Ltd Magnetic recording medium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5754302U (en) * 1980-09-17 1982-03-30
JPS6138482Y2 (en) * 1980-09-17 1986-11-06
JPS57200936A (en) * 1981-06-03 1982-12-09 Hitachi Maxell Ltd Magnetic recording medium
JPH0312371B2 (en) * 1981-06-03 1991-02-20 Hitachi Maxell

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