JPH02235280A - Magnetic disk device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Summary] This invention relates to a magnetic disk device that sends and receives signals via an FPC to a carriage having a head that reads/writes data to/from a disk.
+7 In order to provide a magnetic disk device that reduces stress and prevents cracks and disconnections in the FPC, an FPC holder on the enclosure side is configured to be rotatable relative to the enclosure.

[Industrial Application Field] The present invention transmits and receives signals to and from a carriage having a head that reads/writes data to/from a disk using FPC (Flexible Printed C).
The present invention relates to a magnetic disk device that is operated via a circuit (ircuit).

In such a magnetic disk device, when reading/writing data, a carriage is driven to move the head to a target track. As the carriage is driven, the FP
Bending stress is repeatedly applied to C, which may cause cracks or wire breakage. Therefore, there is a need for a magnetic disk device that does not cause such problems.

[Prior Art] Next, a conventional example will be explained using the drawings. Figure 5 is a configuration diagram of a conventional magnetic disk device, and Figure 6 is the FP in Figure 5.
It is an exploded perspective view of C presser.

In the figure, 1 is a spindle rotationally driven by a spindle motor (not shown), and 2 is a plurality of disks stacked on the spindle 1.

3 is the actuator bottom part. This actuator part 3
is provided with a carriage 7 to which a head 4 for reading/writing data to/from the disk 2 is attached via a gimbal spring 5 and a head arm 6. A guide portion 7a is provided on the side of the carriage 7. The guide portion 7a has guide surfaces facing diagonally upward and diagonally downward.

Reference numeral 8 denotes a guide roller that comes into contact with the guide portion 7a and guides the carriage 7 so as to be movable in the direction of the arrow. The carriage 7 is driven by a voice coil motor (not shown).

9 has the carriage 7 attached to one end, and the FPC to the other end.
These are four FPCs that are attached to the holding part 10 and send and receive signals to and from the carriage 7.

Here, the FPC holding part will be explained using FIG. 6. F
The PC holding part 10 is a block 11 in which a groove 11a is carved.
, a base 14 that is attached to the positive center housing 12 on the magnetic disk device main body side using screws 13 , and a base 14 that surrounds the block 11 and is attached to the block 1 using screws 15 .
1 and a cover 16 attached to a base 14. And two FPCs out of four FPC9
is locked in the groove 11a of the block 11, and the other two
The book's FPC is block 11, base 14 and block 1
The FPC 9 is sandwiched between the FPC 1 and the cover 16, and is fixed to the magnetic disk main body side.

Next, the operation of the above configuration will be explained. The disk 2 is rotated by a spindle motor (not shown) at, for example, 3600 rpm.
It is rotating at a speed of −. When a current flows to the voice coil motor from a control circuit (not shown), the carriage 7 moves in the direction of the arrow in the figure, and the head 4 is moved to the target track.

Then, data is read/written to the disk 2.

[Problems to be Solved by the Invention] In the conventional example with the above configuration, one end of the FPC 9 is attached to the carriage 7 and the other end is attached to the FPC holding part 10. Therefore, when the carriage 7 moves in the direction of the arrow,
There is a problem in that bending stress repeatedly acts on the FPC 9, causing cracks and disconnections in the FPC 9.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a magnetic disk device that reduces bending stress applied to the FPC and prevents cracks and disconnections in the FPC.

[Means for Solving the Problems] FIG. 1 is a diagram showing the principle of the present invention. In the figure, 21 is a disk, and 22 is a data read/write for the disk 21.
A head 23 that performs writing is a carriage having the head 22. 24 is an FPC that sends and receives signals to and from the carriage 23. 26 is an FPC holder rotatably provided on the enclosure 25 side.

[Function] In the magnetic disk device shown in FIG.
3 moves, the FPC presser 25 rotates in a direction that reduces the bending angle of the FPC 24, thereby reducing the bending stress acting on the FPC 24.

[Example] Next, an example of the present invention will be described using the drawings. Second
The figure is a configuration diagram explaining one embodiment of the present invention, and FIG.
FIG. 4 is an exploded perspective view of the FPC holder in the figure, and FIG. 4 is a partial cross-sectional configuration diagram of the FPC holder shown in FIG. 3.

In the figure, 31 is a spindle rotationally driven by a spindle motor (not shown), and 32 is a plurality of disks stacked on the spindle 31.

33 is an actuator unit. The actuator assembly 33 is provided with a carriage 37 to which a head 34 for reading/writing data from/to the disk 32 is attached via a gimbal spring 35 and a head arm 36 . A guide portion 37 is formed on both sides of the carriage 37 with guide surfaces facing diagonally upward and diagonally downward.
A is provided. 38 is in contact with the guide portion 37a,
This is a guide roller that guides the carriage 37 movably in the direction of the arrow. The carriage 37 is driven by a voice coil motor (not shown).

39 has one end attached to the carriage 37, and the other end attached to the F
These are four FPCs that are attached to the PC holding part 40 and send and receive signals to and from the carriage 37.

Here, the FPC holding part 40 will be explained using FIG. 3. The FPC holding part 40 includes a block 41 in which a groove 41a is carved, a base 44 that is rotatably provided with respect to the magnetic disk device main body (enclosure), and a block 4.
1 and a cover 46 which is attached to the base 44 together with the block 41 using screws 45.

Two of the four FPCs 39 are locked in the groove 41a of the block 41, and the other two FPCs are locked in the groove 41a of the block 41.
is sandwiched between the block 41 and the base 44 and the block 41 and the cover 46, and the FPC 39 is held between the FPC presser 4
Fixed to 0.

Next, the rotating structure of the FPC presser 40 will be explained using FIG. 4. Stepped projections 4 are provided on the upper and lower surfaces of the base 44.
4a is provided in a protruding manner. A bearing case 51 in which a bearing 50 is disposed is fixed to the top and bottom surfaces of the magnetic disk device (enclosure). Then, by fitting the small diameter portion of the stepped protrusion 44a of the base 44 into the inner ring of the bearing 50, the base 44 (FPC holding portion 40) can rotate relative to the magnetic disk device (enclosure). .

Next, the operation of the above configuration will be explained. The disk 32 is driven by a spindle motor (not shown), for example, 3600r
It rotates at a speed of pm. Then, when a current flows from a control circuit (not shown) to the voice coil motor, the carriage 37 moves in the direction of the arrow in the figure, and the head 34 is moved to the target track. Then, data is read/written to/from the disk 32.

According to the above configuration, the FPC holding part 40 is rotatably provided with respect to the magnetic disk device.

Therefore, when the carriage 23 moves in the direction of the arrow, FP
The C holding portion 40 rotates in a direction that reduces the deflection angle of the FPC 39. Therefore, the bending stress applied to the FPC is reduced, and cracking and disconnection of the FPC can be prevented.

Note that the present invention is not limited to the above embodiments.

For example, in the above embodiment, the actuator section 33
Although the explanation has been made using a linear type actuator, the present invention can also be applied to a rotary type actuator.

[Effects of the Invention] As explained above, according to the present invention, by providing the FPC holder on the enclosure side so as to be rotatable with respect to the enclosure, bending stress applied to the FPC is reduced, and cracks and disconnections in the FPC are prevented. A magnetic disk device that prevents this problem can be realized.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the principle of the present invention, Fig. 2 is a configuration diagram illustrating an embodiment of the present invention, Fig. 3 is an exploded perspective view of the FPC holder in Fig. 2, and Fig. 4 is shown in Fig. 3. A partial cross-sectional configuration diagram of an FPC holder, Figure 5 is a configuration diagram of a conventional magnetic disk device, and Figure 6 is a diagram of a conventional magnetic disk device.
FIG. 2 is an exploded perspective view of the FPC holder in the ls diagram. 1 to 4, 21.32 is a disk, 22.34 is a head, 23.37 is a carriage, 24.39 is an FPC, 25 is an enclosure, and 26.40 is an FPC holder.

Claims (1)

[Claims] A magnetic disk device that sends and receives signals to and from a carriage (23) having a head (22) that reads/writes data to/from a disk (21) via an FPC (24). A magnetic disk drive characterized in that an FPC holder (26) on the enclosure (25) side is rotatably provided with respect to the enclosure (25).