GB964701A - Improvements in or relating to methods of manufacturing record carriers - Google Patents
Improvements in or relating to methods of manufacturing record carriersInfo
- Publication number
- GB964701A GB964701A GB3479860A GB3479860A GB964701A GB 964701 A GB964701 A GB 964701A GB 3479860 A GB3479860 A GB 3479860A GB 3479860 A GB3479860 A GB 3479860A GB 964701 A GB964701 A GB 964701A
- Authority
- GB
- United Kingdom
- Prior art keywords
- particles
- magnetic
- suspension
- tape
- methods
- 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
- G11B5/62—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
- G11B5/716—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 two or more magnetic layers
Landscapes
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
964,701. Magnetic structures. PHILIPS ELECTRICAL INDUSTRIES Ltd. Oct. 11, 1960 [Oct. 14, 1959], No. 34798/61. Heading H1H. In a method of manufacturing a magnetic recording medium, e.g. a drum, disc or tape, comprising the steps of forming a suspension of magnetic particles in a binder, applying this to a carrier, and fixing the particles, the magnetic layer is built up to the desired thickness from component layers whose thickness is comparable with the particle size, e.g. 0.2-0.3Á. The particles may be acicular γ Fe 2 O 3 , the binder may be a p.v.c. solution, and the carrier may be p.v.c., cellulose acetate, a polyester resin, aluminium or brass. The particles may be orientated by a magnetic field. As shown in Fig. 1, the suspension is sprayed on to a moving tape which passes below heaters 6, 7, 8, a mask ensuring an even distribution. Several sets of sprays and heaters may be provided or several passes of the tape may occur. In Fig. 2 a rotating drum is coated from a nozzle 11, conductors 13 providing a magnetic field. The coercivity and particle density may vary in component layers. Other methods of applying the suspension, e.g. by contacting a surface or by pouring, are disclosed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL244342 | 1959-10-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB964701A true GB964701A (en) | 1964-07-22 |
Family
ID=19751979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3479860A Expired GB964701A (en) | 1959-10-14 | 1960-10-11 | Improvements in or relating to methods of manufacturing record carriers |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH397266A (en) |
| GB (1) | GB964701A (en) |
| SE (1) | SE301393B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1529937A (en) * | 1974-10-16 | 1978-10-25 | Emi Ltd | Magnetic recording |
-
1960
- 1960-10-11 SE SE970160A patent/SE301393B/xx unknown
- 1960-10-11 GB GB3479860A patent/GB964701A/en not_active Expired
- 1960-10-11 CH CH1139960A patent/CH397266A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH397266A (en) | 1965-08-15 |
| SE301393B (en) | 1968-06-04 |
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