Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of biasing or erasing
Patent
1987-04-15
1989-01-31
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of biasing or erasing
358906, G11B 5024
Patent
active
048020281
ABSTRACT:
When a recording track on a magnetic disc (10) is erased, a first erasing signal f.sub.1 with an upper limit of frequency (10 MHz) in a recording signal band is supplied through a magnetic head 14 over a period T.sub.1. Since the erasing signal f.sub.1 is attenuated and vibrated in a period T.sub.12, the residual component is minimized. A second erasing signal f.sub.2 with an upper limit of frequency (20 MHz) which is outside of the recording signal band and can be recording and reproduced by the magnetic head is supplied through the magnetic head 14 over a period T.sub.2, so that the residual component of the erasing signal f.sub.1 is erased. Since the erasing signal f.sub.2 is attenuated and vibrated in a period T.sub.22, the residual component is minimized.
REFERENCES:
patent: 2657277 (1953-10-01), Brastad
patent: 3449529 (1965-08-01), Camras
patent: 4571643 (1986-02-01), Namiki
patent: 4626934 (1986-12-01), Yoshida et al.
patent: 4714969 (1987-12-01), Bischoff et al.
Japanese Periodical "Nikkei Electronics", Jul. 2, 1984, pp. 80-85.
Cardillo Raymond F.
Fournier Kevin
Sanyo Electric Co,. Ltd.
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