The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 05, 1997
Filed:
Jul. 18, 1995
Norio Yagi, Kawasaki, JP;
Kenichi Myokan, Kawasaki, JP;
Takashi Matsumoto, Kawasaki, JP;
Katuhiko Oizumi, Higashine, JP;
Fujitsu Limited, Kawasaki, JP;
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.