JPS57135436A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS57135436A JPS57135436A JP56020388A JP2038881A JPS57135436A JP S57135436 A JPS57135436 A JP S57135436A JP 56020388 A JP56020388 A JP 56020388A JP 2038881 A JP2038881 A JP 2038881A JP S57135436 A JPS57135436 A JP S57135436A
- Authority
- JP
- Japan
- Prior art keywords
- needle
- recording medium
- magnetic recording
- ratio
- alloy powder
- 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
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
- G11B5/62—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
- G11B5/706—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 the composition of the magnetic material
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
PURPOSE:To record short wave of <=1mu and also to obtain a sufficient high output, by using ferromagnetic needle-like alloy powder having specific mean long axial diameter and needle-like ratio. CONSTITUTION:A magnetic recording medium is obtained by applying a magnetic coating material containing ferromagnetic needle-like alloy powder which contains Fe, Fe-Co, Fe-Co-Ni, etc. or an element of a small quantity added to them, and has coercive force of about 700-2,000 oersted, mean long axial diameter (a) of lambda/2.28 (where lambda denotes center recording wavelength and <=1mu), and needle-like ratio of 10, on the base film.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56020388A JPS57135436A (en) | 1981-02-14 | 1981-02-14 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56020388A JPS57135436A (en) | 1981-02-14 | 1981-02-14 | Magnetic recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57135436A true JPS57135436A (en) | 1982-08-21 |
JPH0373051B2 JPH0373051B2 (en) | 1991-11-20 |
Family
ID=12025632
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56020388A Granted JPS57135436A (en) | 1981-02-14 | 1981-02-14 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57135436A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5975432A (en) * | 1982-10-22 | 1984-04-28 | Fuji Photo Film Co Ltd | Magnetic recording body |
JPS59167854A (en) * | 1983-03-14 | 1984-09-21 | Hitachi Maxell Ltd | Magnetic recording medium |
JPS59201218A (en) * | 1983-04-28 | 1984-11-14 | Fuji Photo Film Co Ltd | Magnetic recording medium |
JPS6174137A (en) * | 1984-09-19 | 1986-04-16 | Hitachi Maxell Ltd | Magnetic disk |
JPH0666597U (en) * | 1991-11-07 | 1994-09-20 | 二郎 伊藤 | Press tool |
US6309479B1 (en) | 1998-11-05 | 2001-10-30 | Toda Kogyo Corporation | Spindle-shaped goethite particles, spindle-shaped hematite particles and magnetic spindle-shaped metal particles containing iron as main component |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5529577A (en) * | 1978-08-16 | 1980-03-01 | Bayer Ag | Production of titanium dioxide pigment |
-
1981
- 1981-02-14 JP JP56020388A patent/JPS57135436A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5529577A (en) * | 1978-08-16 | 1980-03-01 | Bayer Ag | Production of titanium dioxide pigment |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5975432A (en) * | 1982-10-22 | 1984-04-28 | Fuji Photo Film Co Ltd | Magnetic recording body |
JPH0479059B2 (en) * | 1982-10-22 | 1992-12-14 | Fuji Photo Film Co Ltd | |
JPS59167854A (en) * | 1983-03-14 | 1984-09-21 | Hitachi Maxell Ltd | Magnetic recording medium |
JPS59201218A (en) * | 1983-04-28 | 1984-11-14 | Fuji Photo Film Co Ltd | Magnetic recording medium |
JPH0479063B2 (en) * | 1983-04-28 | 1992-12-14 | Fuji Photo Film Co Ltd | |
JPS6174137A (en) * | 1984-09-19 | 1986-04-16 | Hitachi Maxell Ltd | Magnetic disk |
JPH0666597U (en) * | 1991-11-07 | 1994-09-20 | 二郎 伊藤 | Press tool |
US6309479B1 (en) | 1998-11-05 | 2001-10-30 | Toda Kogyo Corporation | Spindle-shaped goethite particles, spindle-shaped hematite particles and magnetic spindle-shaped metal particles containing iron as main component |
US6398863B1 (en) | 1998-11-05 | 2002-06-04 | Toda Kogyo Corporation | Spindle-shaped hematite particles and process for making spindle-shaped hematite particles |
Also Published As
Publication number | Publication date |
---|---|
JPH0373051B2 (en) | 1991-11-20 |
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