Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1995-07-18
1997-08-05
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
360 9701, G11B 5012, G11B 3314
Patent
active
056548478
ABSTRACT:
Disclosed is a magnetic disk apparatus which protects magnetic disks against external and internal magnetic fields and electromagnetic waves. This magnetic disk apparatus comprises at least one magnetic disk; rotation unit for rotating the magnetic disk; a magnetic head for recording and reproducing information on and from the magnetic disk; an actuator for supporting the magnetic head and moving the magnetic head to a given position on the magnetic disk; and an enclosure for covering those individual components. According to one aspect of this invention, the enclosure is made of a ferromagnetic material. According to another aspect of this invention, the enclosure is made of a non-magnetic material and a shield layer made of a ferromagnetic material is provided at least in that region of an inner wall of the enclosure which corresponds to the movable range of the magnetic head. According to a further aspect of this invention, this apparatus further comprises a circuit board provided on the inner wall of the enclosure, circuitry for accomplishing magnetic recording and reproduction being mounted on the circuit board, and a shield layer provided between the enclosure and the circuit board. According to a still further aspect of this invention, this apparatus further comprises a circuit board provided on the inner wall of the enclosure, circuitry for accomplishing magnetic recording and reproduction being mounted on the circuit board, and a conductive shield member provided between the magnetic disk and the circuit board.
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Matsumoto Takashi
Myokan Kenichi
Oizumi Katuhiko
Yagi Norio
Fujitsu Limited
Klimowicz William J.
Tupper Robert S.
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