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Metal Working

Disk-drive-apparatus

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Disk drive apparatus

Details

Inventors: Tsujino, Hitoshi;
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Examiner: Levy; Stuart S.
Assistant Examiner: Ditmyer; Paul J.
Attorney, Agent or Firm: Billion; Richard E., Bussan; Matthew J., Truelson; Roy W.

Disclosed is a disk drive for storing representations of data. The disk drive includes a housing or enclosure. At least one disk is rotatably attached to the housing. Also attached to the housing is an actuator. A transducing head is attached to one end of the actuator and is positioned to pass near the disk. Attached on the other end of the actuator is a coil which makes up a portion of a voice coil motor. Another portion of the voice coil motor is a magnet positioned near the coil. The housing includes at least one recess or opening which holds the magnet on the outside of the housing yet near the coil.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG.
1 is an exploded perspective view which shows one embodiment of a magnetic hard disk apparatus according to the present invention, FIG.
2 is a perspective view which shows an appearance of the magnetic hard disk apparatus of FIG.
1, FIG.
3 is a cross-sectional view of FIG.
2 along plane B.
Now referring to these figures, an enclosure 10 is composed of an bottom casing 12 and an upper cover 14 both of which are aluminum die-casted.
Holes 16 are formed at six points on edges of the upper cover 14, and also holes 18 are formed at six points corresponding to those holes 16 in edges of the bottom casing 12.
The holes 18 are threaded.
The upper cover 14 is fixed to the bottom casing 12 by threaded bolts 20 which are fitted into the holes 18 through the holes 16.
The magnetic hard disk 22 is fixed onto a hub of a spindle motor (not shown) which is fixed to the bottom casing 12, and is rotated by the spindle motor.
Heads 24 which read and write one the magnetic hard disk 22 are supported by a carriage 26.
The carriage 26 has a suspension 28.
At the apex of the suspension 28, the head 24 is mounted.
An arm 30 supports the suspension 28.
The arm 30 is connected to a coil 32 which is one component of a voice coil motor (VCM).
The carriage 26 is pivotally mounted through a bearing (not shown) to a pivot 34 fixed on the bottom casing 12.
The carriage 26 rotates with respect to the pivot 34 as current is supplied to the coil 32 in the magnetic field produced by a flat magnets 36.
The flat coil magnet is another component of VCM.
This makes the head 24 seek or follow a required track on the disk 22.
The path of the magnetic flux that is produced by the magnets 36 is determined by an upper yoke 38 and a lower yoke 40 which are made of material of a high magnetic permeability such as iron.
In the area covered by the movement of the coil 32 of the bottom casing 12, three yoke holding projections 42 are formed.
Threaded through holes 44 are formed through each of the yoke holding projections 42

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