GB789613A - Improvements in or relating to magnetic recording media - Google Patents
Improvements in or relating to magnetic recording mediaInfo
- Publication number
- GB789613A GB789613A GB1582955A GB1582955A GB789613A GB 789613 A GB789613 A GB 789613A GB 1582955 A GB1582955 A GB 1582955A GB 1582955 A GB1582955 A GB 1582955A GB 789613 A GB789613 A GB 789613A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pole
- knife
- magnetic
- support
- particles
- 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.)
- Expired
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
- G11B5/842—Coating a support with a liquid magnetic dispersion
- G11B5/845—Coating a support with a liquid magnetic dispersion in a magnetic field
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
789,613. Magnetic dust structures. ELECTRIC & MUSICAL INDUSTRIES, Ltd. June 1, 1956 [June 2, 1955], No. 15829/55. Class 38 (2). A magnetic recording medium is made by discharging on to a thin film 1 of material such as polyvinyl chloride, cellulose-acetate or polyester resin, a coating of magnetically anisotropic magnetic particles in a binder rendered fluid by a solvent. After forming a free loop 8 the coated support 1 travels with its uncoated face adjacent a magnetic pole 11 having a knife edge form to concentrate the flux. This magnetically orientates the particles which are fixed in position when, after being driven by belt 12 over rollers 13, 14, the tape passes through drying chamber 16, where hot air passes in and out at ports 17, 18, respectively. The film 1 is held against the knife edge, and belt 12 by vacuum boxes 9, 10 and 15. The support 1 which may be 14 inches wide and 0.001 inch thick and coated with a layer 0.0005 inch thick, of acicular gamma, ferric oxide particles 0.5 Á by 0.08 Á in size, is then cut into strips of suitable width such as “ inch. The knife-edge of the pole may be rounded and not. sharp and longer than the support is wide. It may be formed by chamfering the pole of a permanent or electromagnet, or on a separate polepiece attached to the pole. A number of spaced knife-edged poles may be employed, e.g. two at the ends of a horse-shoe magnet.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1582955A GB789613A (en) | 1955-06-02 | 1955-06-02 | Improvements in or relating to magnetic recording media |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1582955A GB789613A (en) | 1955-06-02 | 1955-06-02 | Improvements in or relating to magnetic recording media |
Publications (1)
Publication Number | Publication Date |
---|---|
GB789613A true GB789613A (en) | 1958-01-22 |
Family
ID=10066279
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1582955A Expired GB789613A (en) | 1955-06-02 | 1955-06-02 | Improvements in or relating to magnetic recording media |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB789613A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3139354A (en) * | 1961-03-31 | 1964-06-30 | Rca Corp | Magnetic recording element containing magnetic particles treated with werner-type complex compound and method of manufacture thereof |
-
1955
- 1955-06-02 GB GB1582955A patent/GB789613A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3139354A (en) * | 1961-03-31 | 1964-06-30 | Rca Corp | Magnetic recording element containing magnetic particles treated with werner-type complex compound and method of manufacture thereof |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1291366A (en) | Magnetic tape | |
GB708136A (en) | Improvements in or relating to magnetic circuits comprising a highly-permeable part and a substantially flat thin permanent magnet | |
GB666653A (en) | Improvements in or relating to methods of duplicating magnetic recordings, the elongated magnetic record members resulting from said method and apparatus for duplicating magnetic recordings from a master tape | |
GB1364348A (en) | Magneto-resistive devices | |
US4003336A (en) | Device for the magnetic orientation of magnetic recording media | |
JPS57146164A (en) | Speed detecting device for disk type motor | |
GB789613A (en) | Improvements in or relating to magnetic recording media | |
GB951053A (en) | Improvements in magnetic switching devices | |
ES416309A1 (en) | Magnetic separator | |
JPS5641528A (en) | Magnetic transfering and recording system | |
JPS56165923A (en) | Magnetic head | |
JPS5577025A (en) | Erasing head | |
JPS5687217A (en) | Vertical magnetization type magnetic head and its manufacture | |
JPS5250219A (en) | Magnetic recorded pattern reading device | |
JPS58150120A (en) | Vertical magnetic recording head | |
GB691505A (en) | Improvements in and relating to magnetic heads for magnetic recording and reproducing apparatus | |
JPS5644115A (en) | Vertical magnetization type magnetic head | |
GB1420619A (en) | Magnetic devices | |
GB1217111A (en) | Magnetic powder handling | |
GB1116011A (en) | Recording tape | |
GB913798A (en) | Magnetic data processing | |
GB939689A (en) | A magnetic recording means for recording the existence of a unidirectional magnetic field | |
FR2383518A1 (en) | Polarised magnetic circuit for differential interrupters - comprises thin plate with two parallel arms, one carrying reference permanent magnet and excitation winding | |
Bottoni et al. | Correlation between magnetic and electroacoustic parameters of audio magnetic tapes | |
GB799548A (en) | Improvements in and relating to holding magnets |