JP2944360B2 - Magnetic disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive and, more particularly, to a magnetic disk drive suitable for a case where adjustment at the time of mounting a crash stop for restricting a swing range of a head slider is unnecessary.

[0002]

2. Description of the Related Art Conventionally, a magnetic disk drive is equipped with a head positioning mechanism having, for example, a structure shown in FIG. The head positioning mechanism includes a head slider 51 for writing / reading information to / from the disk 50, a suspension 52 for generating a force against the flying force of the head slider 51, and a coil 53 for generating a force for moving the head slider 51. A carriage mechanism 54 that supports the suspension 52 and the coil 53; a support shaft 56 that rotatably supports the carriage mechanism 54 via a bearing 55; and a magnetic circuit unit 57 that supplies a magnetic flux to the coil 53. .

Further, the head positioning mechanism includes a crash stop 60 having a rubber (or resin) 58 and a fixing metal 59, a rubber (or resin) 62 and a fixing metal 63.
And a base plate 61, 65 for fixing the crash stops 60, 64, respectively.
With the crash stops 60 and 64, the swing range of the head slider 51 is regulated via the carriage mechanism 54 and the initial position is determined.

When stopped, the head slider 51 is positioned with high precision by crash stops 60 and 64 at an initial position where a servo signal recorded in advance on the disk 50 can be read out, and stops and comes into contact with it. The disk 50 is levitated by the air flow generated by the rotation of the disk 50, and the floating attitude is controlled by the suspension 54. The head slider 51 is provided with a coil 53
It is moved by energizing to and is positioned on a predetermined track.

[0005]

In the above-mentioned conventional magnetic disk drive, the current supplied to the coil 53 is controlled by a control section (not shown). When the current is supplied, the carriage mechanism 54 and the crash stops 60 and 64 may collide with each other.
The mechanical properties, shapes and the like of the rubbers 58 and 62 constituting the above are examined to reduce the collision acceleration and prevent the head slider 51 from hitting the disk surface. In addition, it is necessary to consider a countermeasure against a phenomenon that the rubbers 58 and 62 and the carriage mechanism 54 are attracted by the influence of the temperature and the head slider 51 cannot be moved.

Further, high accuracy is required for the mounting positions of the crash stops 60 and 64. However, it is difficult to improve the dimensional accuracy of rubber (or resin), which is the material of the crash stops 60 and 64, and there are variations due to assembly. From this point, it is generally necessary to adjust the relative positions of the head slider 51, the crash stops 60, 64, and the disk 50 when mounting the crash stops 60, 64. In addition, with the progress of downsizing and speeding up of the magnetic disk device, it is necessary to increase the recording density of the servo signal on the disk 50.
4, the mounting position accuracy required has been further improved.
Further, as the speed increases, the collision acceleration between the carriage mechanism 54 and the crash stops 60, 64 increases, so that it is necessary to increase the performance and thickness of the rubbers 58, 62. Further, there has been a demand for simplifying the adjustment work from the viewpoint of cost.

However, in the head positioning mechanism provided in the conventional magnetic disk drive, adjustment work is required at the time of mounting the crash stops 60 and 64, so that there is a problem that the cost is increased. Also, the carriage mechanism 54
It is necessary to increase the thickness of the rubbers 58, 62 in order to reduce the collision acceleration between the rubbers 58, 62 and the crash stops 60, 64, but there is a problem that the thickness of the rubbers 58, 62 cannot be sufficiently increased from the viewpoint of mounting. there were.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to improve the disadvantages of the prior art, eliminate the need for adjustment work when installing the crash stop, improve the mounting position accuracy of the crash stop, and further improve the accuracy of the rubber constituting the crash stop. It is an object of the present invention to provide a magnetic disk drive capable of reducing a collision acceleration between a crash stop and a carriage mechanism by increasing a thickness.

[0009]

According to the present invention, there is provided a head slider for writing / reading information to / from a disk, a carriage mechanism for supporting the head slider, and the head slider being connected to the disk via the carriage mechanism. A coil for generating a force for oscillating in the radial direction, a magnetic circuit for supplying a magnetic flux to the coil, and a oscillating range of the head slider via the carriage mechanism, which is provided near the magnetic circuit, and In a magnetic disk drive including a stopper mechanism that determines an initial position, and a substrate that supports the carriage mechanism and the magnetic circuit, the stopper mechanism includes:
An elastic member for restricting the swinging of the carriage mechanism, and a shaft member for supporting the elastic member, provided in the magnetic circuit
The shaft member of the stopper mechanism is inserted and held in the hole
And a part of the cylinder is moved in the axial direction.
Is formed along the shape of a notch . This aims to achieve the above-mentioned object.

[0010]

According to the present invention, the stopper mechanism has an elastic member for restricting the swing of the carriage mechanism and a shaft member for supporting the elastic member, and the shaft member of the stopper mechanism is supported by the magnetic circuit. Configuration to support the shaft member.
Of the hole provided on the magnetic circuit side
Stopper by setting the intersection of the inner diameter and the outer diameter of the shaft member
Relative positioning of mechanism and head slider and disk
Is performed.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a magnetic disk drive according to an embodiment of the present invention.

The structure of a head positioning mechanism provided in the magnetic disk drive of this embodiment will be described with reference to FIGS. 1 to 3. The head positioning mechanism includes a head slider 2 for writing / reading information to / from the disk 1, Suspension 3 for generating force against the flying force of head slider 2
A coil 4 for generating a force for moving the head slider 2, a carriage mechanism 5 for supporting the suspension 3 and the coil 4, a support shaft 7 for rotatably supporting the carriage mechanism 5 via a bearing 6, and a coil 4. And a magnetic circuit section 8 for supplying a magnetic flux to the motor.

Further, the head positioning mechanism regulates a swing range of the head slider 2 via the carriage mechanism 5 and a pair of crash stops 9 and 10 for determining an initial position of the head slider 2; Base plate 1 with crash stops 9 and 10 fixed
1 is provided. Crash stop 9
Includes a semi-cylindrical rubber 12 (or resin) and a shaft-shaped fixing metal 13 to which the rubber 12 is fixed (see FIG. 3). Similarly, the crash stop 10 is a semi-cylindrical rubber 14. (Or resin) and a shaft-shaped fixing metal 15 to which rubber 14 is fixed.

Holes 16 and 17 are formed at both ends in the longitudinal direction of the magnetic circuit portion 8 in consideration of the relative positions of the disk 1 and the crash stops 9 and 10.
Fixing fittings 13 and 15 for the crash stops 9 and 10 are fitted in the holes 16 and 17 respectively. Hole 1
The tolerance (maximum hole diameter−minimum hole diameter) of 6, 17 can be formed to 30 μm or less even in consideration of the plating thickness in the surface treatment. Further, the tolerance (maximum shaft diameter−minimum shaft diameter) of the diameter of the fixing brackets 13 and 15 of the crash stops 9 and 10 can be formed to 10 μm or less by lathe processing.

The magnetic circuit section 8 can be fixed to the base plate 11 and the disk 1 with an error of ± 20 μm via the reference surface or reference positioning pins (not shown). In addition, fixing bracket 1
The center of the holes 16 and 17 of the holes 3 and 15 can be machined within a range of ± 20 μm from the reference plane of the magnetic circuit section 8. From the above, the hole 1 of the magnetic circuit section 8
Fixing bracket 1 for 6,17 and crash stops 9,10
When the gaps 3 and 15 are fitted with a gap, the crash stops 9 and 10 can be positioned with high accuracy of 60 μm or less with respect to the base plate 11 and the disk 1.

Next, the operation of the embodiment constructed as described above will be described.

Head slider 2 for head positioning mechanism
At the time of stop, by crash stops 9 and 10,
While being positioned and stopped with high precision at an initial position where a servo signal recorded in advance on the disk 1 can be read, the disk 1 floats due to the airflow generated by the rotation of the disk 1 and the suspension 3 when driven. Controls the flying attitude. The head slider 2 has a coil 4
When the disk 1 is energized, it moves and is positioned on a predetermined track of the disk 1.

In this case, the fixing brackets 13 and 15 of the crash stops 9 and 10 are connected to the holes 16 and 17 of the magnetic circuit section 8.
The tolerances (maximum hole diameter-minimum hole diameter) of the holes 16 and 17 can be formed to 30 μm or less.
The tolerance of the diameter of the fixing brackets 13 and 15 (maximum shaft diameter−minimum shaft diameter) can be formed to 10 μm or less, and the magnetic circuit section 8 can be formed.
± 20 μm for base plate 11 and disk 1
And the centers of the holes 16 and 17 can be machined within a range of ± 20 μm from the reference plane of the magnetic circuit section 8. Can be positioned.

When the crash stops 9 and 10 are attached to the magnetic circuit section 8, the crash stops 9 and 10
10 fixing metal fittings 13 and 15 to the hole 1 of the magnetic circuit 8
Since it is only necessary to fit the gaps 6 and 17 respectively, the mounting operation can be performed extremely easily, and as a result, the adjustment work at the time of mounting the crash stop as in the related art can be unnecessary.

Further, since the rubbers 12 and 14 of the crash stops 9 and 10 are formed in a semi-cylindrical shape, when the crash stops 9 and 10 are assembled, they are mounted in a state shown by a broken line in FIG. In some cases, the crash stops 9 and 10 can be mounted by half-turning to the carriage mechanism 5 side to determine the direction of the crash stops 9 and 10, so that the mounting efficiency of the crash stops 9 and 10 can be improved. As a result, the rubbers 12 and 14 can have a sufficient thickness, so that the collision acceleration between the carriage mechanism 5 and the crash stops 9 and 10 can be reduced.

As described above, according to the present embodiment, the holes 16 and 17 are formed in the magnetic circuit portion 8 and the holes 16 and 17 are formed.
Fixing brackets 13 and 15 for crash stops 9 and 10
As a result, the construction for adjusting the relative positions of the crash stop, the head slider, and the disk when mounting the crash stop can be omitted, and the crash stops 9 and 10 can be omitted. 6 for base plate 11 and disk 1
Positioning can be performed with high accuracy of 0 μm or less.

Further, since the rubbers 12, 14 of the crash stops 9, 10 are semi-cylindrical, the mounting efficiency of the crash stops 9, 10 can be improved and the rubbers 12, 14 can be improved.
14 can be made sufficiently thick, and the collision acceleration between the carriage mechanism 5 and the crash stops 9 and 10 can be reduced. From the above, the accuracy and reliability of the head positioning mechanism can be improved.

Here, in the present embodiment, the holes 16 and 17 for mounting the fixing fittings 13 and 15 of the crash stops 9 and 10 are formed in the magnetic circuit 8, but the present invention is not limited to this. It is also possible to form a hole in the base plate 11. In this case, the same effects as in the present embodiment can be obtained.

In this embodiment, the rubbers 12, 14 of the crash stops 9, 10 are semi-cylindrical.
However, the present invention is not limited to this, and it is also possible to form a part of the cylinder with a cutout or a column shape along the axial direction.

[0025]

As described above, according to the magnetic disk drive of the present invention, the stopper mechanism is configured to include the elastic member that regulates the swing of the carriage mechanism and the shaft member that supports the elastic member. In the hole provided in the magnetic circuit
The stopper mechanism has a structure in which the shaft member is inserted and held.
Positioning of the hole without increasing the processing accuracy of the elastic member
Head slider easily by increasing the accuracy of
It is possible to increase the accuracy of the initial position.

[0026] Thus, a remarkable effect can be obtained that the adjustment work for adjusting the relative positions of the stopper mechanism, the head slider and the disk as in the related art can be omitted. Further, even when the shaft member of the stopper mechanism is supported on the substrate, the relative positions of the stopper mechanism, the head slider, and the disk can be matched, so that the same effects as described above can be obtained.

[0027] Further, the elastic member constituting the stopper mechanism
The shape must be a part of a cylinder cut away along its axial direction.
Or semi-cylindrical stopper mechanism.
Elastic members required to reduce collision acceleration with the mechanism
Bullet that can take a sufficient thickness.
Of inserting the shaft member into the insertion hole provided in the conductive member
The material of the elastic member around the shaft member that can be omitted
Elasticity around the shaft member that can save consumption
The area occupied by members can be reduced,
Have fruit.

[Brief description of the drawings]

FIG. 1 is a partially cutaway explanatory view showing a planar configuration of a head positioning mechanism in a present embodiment to which the present invention is applied.

FIG. 2 is an explanatory view, partly in section, showing a side configuration of a head positioning mechanism in FIG. 1;

3A and 3B are diagrams illustrating a configuration of a crash stop according to the present embodiment, wherein FIG. 3A is an explanatory diagram illustrating a front configuration, and FIG. 3B is an explanatory diagram illustrating a planar configuration.

FIG. 4 is a partially cutaway plan view showing a configuration of a head positioning mechanism in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc 2 Head slider 5 Carriage mechanism 8 Magnetic circuit 9, 10 Crash stop as a stopper mechanism 11 Base plate as a substrate 12, 14 Rubber as an elastic member 13, 15 Fixing hardware as a shaft member 16, 17 hole

Claims (3)

(57) [Claims] A head slider for writing / reading information to / from a disk, a carriage mechanism for supporting the head slider, and a force for swinging the head slider in the disk radial direction via the carriage mechanism. A coil that is generated, a magnetic circuit that supplies a magnetic flux to the coil, a stopper mechanism that is disposed near the magnetic circuit, regulates a swing range of the head slider via the carriage mechanism, and determines an initial position, In a magnetic disk drive including the carriage mechanism and a substrate supporting the magnetic circuit, the stopper mechanism includes an elastic member that regulates swinging of the carriage mechanism, and a shaft member that supports the elastic member. A hole provided in the magnetic circuit in front of the stopper mechanism.
The shaft member is inserted and held, and the elastic member is
Characterized in that a part of the magnetic disk drive is cut out along the axial direction thereof . 2. A head slider for writing / reading information to / from a disk, a carriage mechanism for supporting the head slider, and a force for swinging the head slider in the disk radial direction via the carriage mechanism. A coil that is generated, a magnetic circuit that supplies a magnetic flux to the coil, a stopper mechanism that is disposed near the magnetic circuit, regulates a swing range of the head slider via the carriage mechanism, and determines an initial position, In a magnetic disk drive including the carriage mechanism and a substrate supporting the magnetic circuit, the stopper mechanism includes an elastic member that regulates swinging of the carriage mechanism, and a shaft member that supports the elastic member. The shaft of the stopper mechanism is inserted into a hole provided in the substrate.
The member is inserted and held, and the elastic member is
A magnetic disk drive characterized in that a portion is cut out along an axial direction thereof . 3. The elastic member of the stopper mechanism is provided with a half
3. The method according to claim 1, wherein the shape is cylindrical.
Magnetic disk drive.