JPS5567940A - Magnetic recording medium and its manufacture - Google Patents
Magnetic recording medium and its manufactureInfo
- 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
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
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)
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 |
-
1978
- 1978-11-13 JP JP13889078A patent/JPS5567940A/en active Pending
Cited By (4)
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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