Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1996-05-20
2000-04-18
Miller, Brian E.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
G11B 3314
Patent
active
060522550
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a magnetic disk unit and, in particular, to a portable and compact magnetic disk unit that can be detached from an information processing apparatus and carried.
BACKGROUND ART
To make a magnetic disk unit compact and thinned so that it may be used as a portable and exchangeable storage medium, an internal spindle mechanism, a magnetic head positioning mechanism and so on must be protected from impacts that result from falls or the like of the magnetic disk unit.
For example, Japanese Unexamination Patent Publication No. 5-258545 discloses a magnetic disk unit in which a viscous member is sandwiched between a base and a top plate to absorb vibrations of its cover. However, the disclosure fails to propose any solution to avoid an adverse effect caused to a spindle motor and a head positioner by impacts exerted to the base plate.
Further, Japanese Unexamination Patent Publication No. 4-368690 discloses a magnetic disk unit in which the four external corners of the case of the unit are provided with elastic members so as to weaken impacts caused when the unit falls and hits against a floor. However, the disclosure has proposed no solution to cope with impacts exerted to the unit at its portions other than the four corners.
DISCLOSURE OF THE INVENTION
As described above, the prior art magnetic disk unit lacks solutions to protect the spindle motor, the head positioner and so on from impacts which are frequently exerted in horizontal directions to the portable and compact magnetic disk unit when it is handled during carrying or from impacts exerted to the magnetic disk unit when it is placed on a desk top.
Accordingly, it is an object of the present invention to provide a magnetic disk unit that is capable of protecting internal mechanisms from impacts exerted in a wider range of directions.
It is another object of the present invention to provide a magnetic disk unit that is capable of weakening the impact that acts on the base to thereby protect internal mechanisms such as a spindle mechanism and a head positioning mechanism mounted on a base.
It is a further object of the present invention to provide a thin type magnetic disk unit that is capable of protecting its internal mechanisms against fall and collision.
According to the first aspect of the invention, there is provided a magnetic disk unit comprising a spindle mechanism for rotating a magnetic disk, a head positioning mechanism for positioning a magnetic head by shifting said magnetic head along a recording surface of said magnetic disk, a base supporting said spindle mechanism and said head positioning mechanism, and a cover that covers in a non-contacting relationship said spindle mechanism and said head positioning mechanism supported on said base, wherein the joint portion of the cover and the base is structured such that the lower edge portion of said cover extends downward beyond the level of the underside of said base to cover the outer peripheral edge of said base in a non-contacting relationship thereto and said cover and said base are connected together in the inner portion of said cover with a cushioning material interposed therebetween.
According to the second aspect of the invention, there is provided a magnetic disk unit comprising a spindle mechanism for rotating a magnetic disk, a head positioning mechanism for positioning a magnetic head by shifting said magnetic head along a recording surface of said magnetic disk, a base supporting said spindle mechanism and said head positioning mechanism, and a cover that covers in a non-contacting relationship said spindle mechanism and said head positioning mechanism supported on said base, wherein said head positioning mechanism supports said magnetic head such that said magnetic head is movable in a space between said magnetic disk and said base, the joint portion of the cover and the base is structured such that the lower edge portion of said cover extends downward beyond the level of the underside of said base to cover the outer peripher
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Ikeda Hiroshi
Kawabe Yoshiko
Matsuda Yasuhiro
Shimizu Isao
Takahashi Tsuyoshi
Hitachi , Ltd.
Miller Brian E.
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