Title:
DISC-SHAPED MAGNETIC RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/1983/002520
Kind Code:
A1
Abstract:
Disc-shaped magnetic recording medium adapted for obtaining a high reproduction output with low noise, particularly for high density recording. In this medium, a ferromagnetic powder which has a remanence of more than approx. 1000 Oe and a BET specific surface area of approx. 25 to 70 m2/g is employed. Thus, noise can be reduced, and the electromagnetic characteristics for recording at a high density can be satisfied. Further, the ferromagnetic powder is orientated at random (without orientation) or in the circumferential direction within the magnetic layer, thereby eliminating variations in the output and obtaining a high reproduction output.
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Inventors:
CHUBACHI RYOJI (JP)
KAWAMURA YOSHIHISA (JP)
NIHEI NOBUYUKI (JP)
KAWAMURA YOSHIHISA (JP)
NIHEI NOBUYUKI (JP)
Application Number:
PCT/JP1983/000007
Publication Date:
July 21, 1983
Filing Date:
January 10, 1983
Export Citation:
Assignee:
SONY CORP (JP)
International Classes:
B05D5/12; C09D5/23; C09D127/04; G11B5/82; C09D127/06; C09D175/00; C09D175/04; G11B5/68; G11B5/70; G11B5/706; G11B5/84; G11B5/845; H01F10/00; (IPC1-7): G11B5/70; G11B5/82
Foreign References:
| JPS5370397A | 1978-06-22 | |||
| JPS5310100A | 1978-01-30 | |||
| JPS4889704A | 1973-11-22 | |||
| JPS54159204A | 1979-12-15 |
Other References:
See also references of EP 0098307A4
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