Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1996-01-25
1997-09-23
Evans, Jefferson
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
360 9702, G11B 3314
Patent
active
056711034
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a magnetic disk drive having a magnetic head capable of reading information from and writing information on a magnetic disk, particularly to a magnetic disk drive which is improved in structure to mount external components such as a printed circuit board on a disk enclosure.
2. Description of the Related Art
FIGS. 4 through 6 are front cross-sectional views showing conventional magnetic disk drives.
A disk enclosure 101 of the magnetic disk drive generally comprises a base 101a and a cover 101b. A magnetic disk 102, a spindle motor 103 serving as a means for rotatably driving the magnetic disk 102, a support mechanism 104 for supporting a magnetic head 106, a voice coil motor 105 serving as a mechanism for driving the magnetic head 106 are respectively disposed in the disk enclosure 101 with respect to the base 101a.
The magnetic disk 102 is clamped by the spindle motor 103 and is rotatably driven by the spindle motor 103 at a given speed. The support mechanism 104 for supporting the magnetic head 106 comprises a suspension 107, an arm body 108, a swing shaft, i.e., a rotating central shaft 109 and a bearing 110.
The magnetic head 106 is supported by an end of the suspension 107 while keeping an appropriate interval between itself and a surface of the magnetic disk 102 due to balance between a lift caused by air current involved in a rotation of the magnetic disk 102 and a load applied by the suspension 107 so as to read information from and write information on the magnetic disk 102.
The arm body 108 holds a base end portion of the suspension 107, and is fixed to the rotating central shaft 109. The rotating central shaft 109 is rotatably supported by the bearing 110 in the base 101a. Accordingly, the arm body 108 rotates together with the rotating central shaft 109 so as to allow the magnetic head 106 to access the magnetic disk 102 at an arbitrary position of the magnetic disk 102.
The voice coil motor 105 comprises an upper yoke 111, a lower yoke 112, a permanent magnet 113 and a coil 114. The coil 114 is fixed to an arm 108a extending from the arm body 108. The arm 108a together with the coil 114 is urged due to a magnetic force which is generated when the coil 114 is energized, so as to rotate the arm body 108 about the rotating central shaft 109. The magnetic head 106 is positioned radially at an arbitrary position with respect to the magnetic disk 102 when the arm body 108 is rotated.
An inner space of the disk enclosure 101 comprising the base 101a and cover 101b must be always clean, therefore the disk enclosure 101 is airtightly structured.
That is, when information is read from or written on the magnetic disk 102, a gap defined between the magnetic head 106 and a surface of the magnetic disk 102 is adjusted to be a very small distance, i.e., normally 0.1 .mu.m or less. Accordingly, if ambient dust particles such as tobacco smoke each having a small diameter enter between the magnetic disk 102 and the magnetic head 106, the magnetic head 106 contacts the surface of the magnetic disk 102 to generate a crash, which causes the likelihood of destruction of precious information stored on the magnetic disk 102.
Accordingly, a coupling portion between the base 101a and the cover 101b is bonded by an adhesive tape 115, etc., so as to completely seal a gap defined therebetween as disclosed in Japanese Patent Laid-Open Publication No. 3-171491.
A printed circuit board 116 includes a circuit for driving the spindle motor 103 and the voice coil motor 105, and it is fixed to an outer bottom portion of the base 101a by set screws 117. The reason for fixedly mounting the printed circuit board 116 on the outer bottom portion of the base 101a instead of accommodating it inside the disk enclosure 101 is that firstly, dust attached to the printed circuit board 116 is difficult to be removed completely even if the printed circuit board 116 is subjected to a cleaning process, secondly the printed circuit board 116 generates a larg
REFERENCES:
patent: 4812932 (1989-03-01), Hishinuma et al.
patent: 5007946 (1991-04-01), Babini
patent: 5025335 (1991-06-01), Stefansky
patent: 5079655 (1992-01-01), Yagi
patent: 5124855 (1992-06-01), Dew et al.
patent: 5235481 (1993-08-01), Schmitz
patent: 5306108 (1994-04-01), Goldman
patent: 5366200 (1994-11-01), Scura
patent: 5454157 (1995-10-01), Ananth et al.
patent: 5469311 (1995-11-01), Nishida et al.
patent: 5524785 (1996-06-01), Georges
patent: 5537270 (1996-07-01), Morehouse et al.
Citizen Watch Co. Ltd.
Evans Jefferson
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