JP2003141838A - Magnetic disk drive - Google Patents

Abstract

(57) [Summary] In a magnetic disk drive, an unload operation is performed at a higher speed than a load operation by utilizing an airflow generated by rotation of a magnetic disk. A magnetic disk (2) having a data area for recording information, a disk rotating mechanism (100) for rotating the magnetic disk (2) at a high speed, a slider (4) on which a magnetic head is mounted, and a slider (4) in the radial direction of the magnetic disk (2) , And a load / unload mechanism 102 for loading / unloading the slider 4. The disk rotation mechanism 100 sets the rotation direction of the magnetic disk such that a force for pushing the actuator 101 outward in the radial direction is generated during the load / unload operation by the airflow generated by the rotation of the disk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device, and particularly to a magnetic disk device having a load / unload mechanism.

[0002]

2. Description of the Related Art In recent years, a small personal computer having excellent portability has been widely used, and a magnetic disk device mounted therein has a small size and a large capacity and is widely used. In order to improve impact resistance performance, such a magnetic disk device is being equipped with a load / unload mechanism capable of retracting the slider from the magnetic disk when information is not recorded / reproduced on the magnetic disk.

A conventional magnetic disk device is shown in FIGS.
This will be described with reference to 2. The conventional magnetic disk device includes a magnetic disk 2 having a data area for recording information, a disk rotating mechanism 100 for rotating the magnetic disk 2 at a high speed by a spindle motor, and recording / recording information.
A slider 4 equipped with a magnetic head for reproduction, an actuator 101 for moving the slider 4 in the radial direction of the magnetic disk 2, and a slider 4 with respect to the data area of the magnetic disk 2 as the actuator 101 moves. A load / unload mechanism 102 for performing a load / unload operation is provided. And the slider 4
Are installed at the tip of the actuator 101.

The disk rotating mechanism 100 uses an air flow 30 generated by the rotation of the magnetic disk 2 to drive the actuator 10
The rotation direction of the magnetic disk 2 is set so that the force 31 for pushing 1 inward in the radial direction is generated during the load / unload operation (see FIG. 19). In addition, the disk rotation mechanism 1
In 00, the rotation direction of the magnetic disk 2 is set so that the air flow 30 due to the rotation of the magnetic disk 2 flows into the tip side from the rotation axis side of the actuator 101 (FIG. 2).
0 and FIG. 21).

The loading / unloading mechanism 102 includes a ramp member 10 provided near the outer peripheral end of the magnetic disk 2,
A lift tab 11 provided at the tip of a suspension 5 supporting the slider 4 and a hook 12 provided at the tip of a flexure 15 are provided (see FIG. 22).
The lift tab 11 and the ramp member 10 can be engaged and disengaged by the movement of the actuator 101. The hook 12 is provided at a position distant from the lift tab 11 so as to extend from a flexure 16 to which the slider 4 is adhered and can be engaged with the suspension body 14.
As a result, the slider 4 is separated from the magnetic disk 2 and retracted when recording / reproducing is not performed (hereinafter referred to as a ramp load method). The ramp load method is widely used because it has the advantages that it can be realized without making a great change to the magnetic disk device before that and the cost increase can be suppressed to the minimum.

The slider 4 is equipped with a magnetic head for recording / reproducing information, and the actuator 1
The actuator 101 is attached to the tip of the actuator 01.
Is driven to reciprocate in the radial direction of the magnetic disk 2.
The slider 4 employs a negative pressure combined slider in order to realize the same flying height over the entire surface of the magnetic disk 2.
This negative pressure combined slider is provided with a pocket on the surface facing the disk, in which a pressure lower than the atmospheric pressure (that is,
By generating a negative pressure, it is intended to make the slider floating force constant with respect to the peripheral speed of the magnetic disk 2 which differs depending on the disk radial position.

The actuator 101 includes a suspension 5, a carriage 6, a magnet 7, a coil and a rotary shaft 9.
(See FIG. 19). The suspension 5 includes the spring portion 13 and the suspension body 14.
And the flexure 15 (see FIG. 22).

In the magnetic disk 2, the vicinity of the outer periphery where the slider 4 may come into contact during the load / unload operation is separated from the data area as a load / unload area to ensure data reliability. Further, in the magnetic disk 2, there is a possibility that protrusions, dust or the like generated when the disk is gripped at the time of film formation or assembly are present near the outermost end of the disk further outside the load / unload area. It has a floating non-guaranteed area.

As a document related to the conventional example, there is JP-A-2000-76810.

[0010]

However, in the conventional magnetic disk apparatus, as shown in FIG. 19, a force 31 for pulling the actuator 101 radially inward by the air flow 30 caused by the rotation of the magnetic disk 2 is loaded / unloaded. Since this force 31 is generated during the load operation, this force 31 resists the force 32 that moves the actuator 101 toward the ramp member 10. In other words, the slider 4 must be moved against the air flow 30 generated by the rotation of the rotating disk 2 (that is, in the direction opposite to the force 31 of the air flow 30).
For this reason, in order to unload the slider 4, a large current must be passed through the coil of the actuator 101 to obtain a large propulsive force, and it is difficult to perform the unload operation at high speed.

In particular, the back electromotive force of the spindle motor which rotates by inertia by turning off the power supply of the spindle motor is utilized,
In the case where the unloading operation system in which the slider 4 is retracted to the outside of the magnetic disk 2 is adopted, the rotational speed of the magnetic disk 2 is lowered and the slider 4 is moved to a predetermined position after a lapse of time after the power is turned off. There is a high possibility that the floating state cannot be maintained and the disk collides with it, and the counter electromotive force decreases and the lift tab 11 cannot reach the ramp member 10 and stops on the magnetic disk 2. There was a problem of becoming.

Further, in the conventional magnetic disk device, the air flow 30 generated by the rotation of the magnetic disk 2 is applied to the actuator 101.
Since it flows from the rotation axis side to the tip side, when the magnetic disk 2 rotates at high speed,
As shown in FIGS. 20 and 21, the airflow 30 collides with the carriage 6 and the suspension 5 to generate turbulence or vortex. Since the slider 4 exists on the downstream side of this turbulent air flow (hereinafter, referred to as fluctuating flow), the slider 4 is easily exposed to the fluctuating flow and the slider 4 and the suspension 5 are easily excited. In particular, when the slider 4 combined with negative pressure is used, the fluctuation flow flows into the negative pressure pocket, so that the slider 4 is easily excited. For these reasons, there is a problem that the positioning accuracy is deteriorated and the flying of the slider 4 is adversely affected and the reliability of the device is impaired.

Further, the height at which the lift tab 11 is lifted by the ramp member 10 from the flying state of the slider is H1,
The distance from the spring portion 13 to the contact point due to the engagement between the lift tab 11 and the ramp member 10 is A, and the distance from the spring portion 13 to the hook 1
Distance up to 2 is L1, suspension body and hook 12
Assuming that the hook gap is the hook gap S, the following equation (1) is established.

H1 = A · S / L1 (1) As is clear from the equation (1), in order to quickly unload the slider 4, the distance L1 is increased,
It is necessary to reduce the distance A and the hook gap S. However, in the conventional magnetic disk device, since the hook 12 is provided at a position far from the lift tab 11,
The distance L1 is small. As a result, the slider 4 cannot be peeled off quickly from the surface of the magnetic disk 2, and the slider 4
Has a high possibility of coming into contact with the protrusions in the non-levitation guaranteed region of the magnetic disk 2 and a possibility of adhering dust, and there is a problem that the reliability of the apparatus is impaired. Increasing the load / unload area to improve this causes a problem that the data area of the magnetic disk 2 decreases.

In addition, if the distance from the lift tab 11 to the hook 12 is long, the suspension body 14 is likely to bend during unloading and a lift delay is likely to occur. If the rigidity of the suspension body 14 is increased in order to improve this, the mass of the suspension body 14 increases. As the mass of the suspension body 14 increases,
When a shock or the like from the outside is input to the device during operation, a large shock acceleration is applied due to the mass of the suspension body 14. That is, a large impact force is generated by multiplying the mass by the impact acceleration. When a large impact force is applied to the suspension 5, the slider 4 jumps up from the magnetic disk 2 surface,
There has been a problem that the slider 4 is damaged when it comes into contact with the magnetic disk 2 again.

A first object of the present invention is to provide a magnetic disk device capable of performing an unload operation at a higher speed than a load operation by utilizing an air flow generated by the rotation of a magnetic disk.

A second object of the present invention is to prevent the slider from being exposed to the fluctuating flow generated by the collision of the air flow with the actuator, and to improve the positioning accuracy and the floating property of the slider and to provide a highly reliable magnetic field. To provide a disk device.

A third object of the present invention is to provide a magnetic disk device capable of reducing the delay in the takeoff and landing of the slider during loading / unloading and improving the reliability while increasing the data area of the magnetic disk. To provide.

[0019]

In order to achieve the first object, a magnetic disk device of the present invention comprises a magnetic disk having a data area for recording information, and a high speed spindle motor for the magnetic disk. A disk rotating mechanism for rotating, a slider on which a magnetic head for recording / reproducing information is mounted, an actuator for moving the slider in the radial direction of the magnetic disk, and a slider for moving the slider along with the movement of the actuator. A load / unload mechanism for performing a load / unload operation on the data area of the disk, wherein the disk rotation mechanism loads / unloads a force that pushes the actuator outward in the radial direction by an air flow generated by the disk rotation. As a configuration in which the rotation direction of the magnetic disk is set so that it occurs during operation That.

In order to achieve the second object, the magnetic disk device of the present invention comprises a magnetic disk having a data area for recording information, and a disk rotating mechanism for rotating the magnetic disk at a high speed by a spindle motor. A slider having a magnetic head for recording / reproducing information, an actuator for moving the slider in the radial direction of the magnetic disk, and a slider for moving the slider with respect to a data area of the magnetic disk. Load / unload mechanism for performing load / unload operation by means of a negative pressure combined slider having a pocket for generating a negative pressure lower than atmospheric pressure, and the slider is arranged at the tip of the actuator. The disk rotation mechanism is configured such that the airflow generated by the disk rotation causes the actuator to move. As flows from the distal end side of the motor,
The rotation direction of the magnetic disk is set.

In order to achieve the third object, the ramp type magnetic disk apparatus of the present invention comprises a slider which floats on the surface of a rotating disk by utilizing the relative motion with the magnetic disk.
A flexure that supports the slider, a suspension body that supports the flexure and that has a lift tab at the tip, a carriage that joins the other end of the suspension body and that rotates, and a slider that retracts the slider from the magnetic disk. A ramp member is provided, and a hook that pulls up the slider by engaging the ramp member and the lift tab is provided in the vicinity of the lift tab, and the rotation direction of the magnetic disk is from the tip of the lift tab toward the carriage. It is configured to rotate.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments of the present invention will be described below with reference to the drawings. In addition, in the second and subsequent embodiments, a part of the configuration common to the first embodiment will be omitted, and redundant description will be omitted. The same reference numerals in the drawings of the respective embodiments and the conventional examples indicate the same or equivalent parts.

A ramp load type magnetic disk device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 10.

First, the overall construction and operation of the ramp load type magnetic disk device of the first embodiment will be described with reference to FIGS.

The magnetic disk drive, as shown in FIG.
It is composed of a magnetic disk 2, a disk rotating mechanism 100, a slider 4, a positioning actuator 101, a load / unload mechanism 102, and the like. These elements are arranged in an enclosed space of a housing composed of the base 1 and a cover (not shown). This magnetic disk device is small and has a large capacity to be mounted in, for example, a small personal computer having excellent portability.

The disk rotating mechanism 100 is composed of a spindle motor (not shown), a clamper 3 and the like. The spindle motor is attached to the base 1. A plurality of disk-shaped magnetic disks 2 are stacked and mounted on a rotating portion of a spindle motor at a predetermined interval.
The clamper 3 is provided so as to fix the plurality of magnetic disks 2 to the spindle motor. Magnetic disk 2
Is rotated in the direction indicated by the arrow in the figure (right rotation) by the rotation of the spindle motor. The spindle motor is set to rotate at a high speed (for example, rotate at 15000 r / min).

The slider 4 is equipped with a magnetic head 4c (see FIG. 2) for recording / reproducing information, and
It is mounted on the tip of the actuator 101, and is reciprocated in the radial direction of the magnetic disk 2 by driving the actuator 101. As the slider 4, a negative pressure combined slider is adopted in order to realize the same flying height over the entire surface of the magnetic disk 2. This negative pressure combined slider is provided with a pocket on the surface facing the disk, and by generating a pressure (negative pressure) lower than the atmospheric pressure in this pocket, the slider floats up against the peripheral speed of the magnetic disk 2 which differs depending on the disk radial position. It tries to make the power constant. The magnetic head 4c is provided on the downstream side of the lower surface of the slider 4 for recording information on the magnetic disk 2 and reproducing the recorded information.

Here, a specific structure of the slider 4 will be described with reference to FIG. The slider 4 includes an air inflow end 4a, an air bearing surface 43, and an air outflow end 4b.
The air bearing surface 43 has a front pad 53 and a rear pad 54.
Is equipped with. The front pad 53 has an air inflow end 4a.
And the step bearing surface 45 formed continuously from the step bearing surface 45 and the step bearing surface 45 higher than the step bearing surface 45.
And a pair of step bearing surfaces 48 having the same depth as the step bearing surface 45, and deeper than the step bearing surface 45 and continuing from the step bearing surface 45 and the step bearing surface 48. And a negative pressure pocket 52 formed. Further, the rear pad 54 has the same depth as the rail surface 51 on the air outflow end 4b side of the slider 4 and the step bearing surface 45, and the rail surface 5 is formed.
1 and a step bearing surface 50 formed so as to surround 1. The rear pad 54 is provided so as to be separated from the front pad 53 via the negative pressure pocket 52 and located at the center of the air outflow end 4b of the slider 4. On the rail surface 51 of the rear pad 54, a magnetic head 4c for recording / reproducing information on / from the disk recording medium 17 is provided.

As shown in FIG. 1, the actuator 101 includes a suspension 5, a carriage 6, a magnet 7,
The coil 8 and the rotary shaft 9 are included. The suspension 5 supports the slider 4 on one side and is connected to the carriage 6 on the other side. The carriage 6 is
The suspension 5 is supported on one side, and is rotatably supported on the rotating shaft 9 at the central portion. The other side of the carriage 6 extends further from the rotary shaft 9 and faces the magnet 7. The coil 8 is the carriage 6 facing the magnet 7.
It is mounted on the surface and an electric current is supplied from the outside through a lead wire (not shown).

The actuator 101 is driven by passing a current through the coil 8 and performs a positioning operation for recording / reproducing information. That is, since the coil 8 is arranged in the magnetic field generated by the magnet 7, a driving force is generated in the coil 8 by the current flowing through the coil 8, and the carriage 6 is rotated about the rotation shaft 9 as a rotation center. As a result, the slider 4 and the suspension 5 are
The magnetic disk 2 is reciprocally moved in the radial direction, and the load / unload mechanism 102 performs a load / unload operation. In this embodiment, an unloading operation method is adopted in which the spindle motor is turned off and the back electromotive force of the spindle motor that rotates by inertia is used to retract the slider 4 from the magnetic disk 2. .

The loading / unloading mechanism 102 comprises a ramp member 10, a lift tab 11, a hook 12 and the like. The ramp member 10 is composed of, for example, a cam member, has an inclined portion 10a with which the lift tab 11 slides and engages, a holding portion 10b, and the like, and extends outward from the outer peripheral end of the magnetic disk 2. . The lift tab 11 is provided so as to project from the tip of the suspension 5, and is engaged with the ramp member 10 to lift the suspension 5 and thus retract the slider 4 from the magnetic disk 2. The hooks 12 are provided near the lift tab 11 at left and right positions with respect to the central axis.

As shown in FIG. 3, the disk rotating mechanism 100 loads / loads a force that pushes the actuator 101 radially outward by the air flow 30 generated by the rotation of the magnetic disk 2.
The rotation direction of the magnetic disk 2 is set so as to occur during the unload operation. Air flow 30 force 31
Overlaps with the unloading direction 32 and serves as a driving force for the unloading operation. Therefore, the unload operation can be performed with a small current. Further, if the thrust of the actuator 101 is the same, the unloading operation can be performed at high speed.

By performing the high-speed unloading operation in this way, the back electromotive force of the spindle motor that turns off the spindle motor power and rotates by inertia is used to retract the slider 4 from the magnetic disk 2. Even if such an unloading operation method is adopted, the slider 4 can maintain a predetermined floating state during the unloading operation, and the lift tab 11 can be prevented from being unable to reach the ramp member 10.

On the other hand, the force 31 by the air flow 30 is in the direction opposite to the loading direction, and acts as a force against the loading operation.
As a result, the speed during the load operation can be made slower than the speed during the unload operation. That is, in order to prevent the scratches from being generated by contacting the magnetic disk 2 due to the slider 4 being loaded at a high speed, it is necessary to make the speed of the loading operation slower than the speed of the unloading operation. However, this can easily be achieved by utilizing the force 31 by the air flow 30.

Further, since the rotating direction of the magnetic disk 2 is set so that the air flow 30 generated by the rotation of the magnetic disk 2 flows in from the tip side of the actuator 101, FIG.
And, as shown in FIG. 5, the carriage 6 seen in the conventional example.
The slider 4 is not exposed to the fluctuating flow 33 generated by colliding with the suspension 5 or the suspension 5. Therefore, it is possible to reduce the excitation of the slider 4 and the suspension 5 due to the fluctuating flow. Particularly, when the negative pressure combined slider 4 is used, the fluctuation flow does not flow into the negative pressure pocket, so that the excitation of the slider 4 can be suppressed. For these reasons, the positioning accuracy is improved and the flying of the slider 4 is also improved, so that the reliability of the device can be improved.

Next, details of the actuator 101 will be described with reference to FIGS. 6 to 10.

The suspension 5 comprises a spring portion 13, a suspension body 14 and a flexure 15. The spring portion 13 and the suspension body 14 are integrally formed of the same material. The spring portion 13 is formed of a plurality of strip portions and connects the suspension body 14 and the carriage 6. As a result, the suspension body 14 is elastically supported by the carriage 6 via the spring portion 13.

The suspension body 14 has a flange 14
a, flat portion 14b, dimple 14c, and lift tab 1
1 is integrally formed. Flange 14a
Is formed by bending both sides of the flat portion 14b in order to increase the rigidity up to the tip of the suspension body 14. The dimple 14c is formed to apply a load to the slider 4, and is formed so as to project into the window hole 16. The window hole 16 is provided at the tip of the suspension body 14 which is the tip of the actuator 101.

The lift tab 11, which constitutes a part of the load / unload mechanism 102, is formed so as to project from the tip of the suspension body 14. The lift tab 11 extends from the root including the suspension body 14 to U.
It is drawn (bent) into a letter shape. The suspension body 14 and the window hole 16 are provided close to each other.

The thin plate-shaped flexure 15 includes a slider mounting portion 15a, a flexible finger portion 15b, and a flexure body 15c.
And the hook 12 are integrally formed. One end of the flexure body 15c is joined to the flat portion 14b of the flange by pivot welding, an adhesive, or the like. As a result, the flexure 15 is supported by the suspension body 14 like a cantilever. The slider attachment portion 15a extends inward from the tip end side of the flexible finger portion 15b.

The hook 12 is the load / unload mechanism 1
Although it constitutes a part of 02, it extends upward from the other end side of the flexure 15 and has a locking portion 12a. The locking portion 12a is provided above the front end portion of the suspension body 14 and in a position where it faces the suspension body 14 substantially in parallel, and has a predetermined space (hereinafter, referred to as a hook gap) S with the suspension body 14 when the slider 4 is loaded. (Fig. 7
reference). Since the dimples 14c elastically press-contact with the back surface of the slider mounting surface 15a (the surface opposite to the slider bonding surface in FIG. 8) and the approach of the flexure 15 to the suspension 5 is restricted, the hook gap S becomes smaller than the state shown in FIG. It does not expand. The hook gap S is set to 40 μm.

The hook 12 is formed close to the lift tab 11 (in other words, provided near the ramp member 10 during the unloading operation), and
One is formed on each side of the lift tab 11.

A configuration for sending a read / write signal to the magnetic head 4c will be described with reference to FIG. 9 in which the suspension 5 before slider attachment is viewed from the slider attachment surface side. The read / write terminal 17 is a terminal electrically connected to the magnetic head 4c, and is provided on the surface of the slider mounting surface 15a closer to the spring portion 13 than the dimple 14c. Wiring 1 for sending read / write signals
8 is the read / write terminal 17 to the slider mounting surface 1
5a, the flexible fingers 15b and the flexure body 15c, and further from the suspension body 14 to the carriage 6
To a control unit (not shown). Wiring 18
Is formed by patterning an insulating layer made of polyimide or the like, a conductor layer, and a cover layer on the surface.

The slider 4 has the inflow end 4a at the lift tab 1
It is bonded to the surface of the slider mounting portion 15a so that the first side and the outflow end 4b are on the read / write terminal bonding portion 17 side. The pressing load of the slider 4 by the dimple 14c is generated by bending the spring portion 13 by bending it at a predetermined angle before mounting it in the apparatus and mounting the slider 4 substantially parallel to the surface of the magnetic disk 2. It This pressing load is transmitted to the slider 4 via the dimples 14c provided on the suspension body 14.

Next, the load / unload operation of this embodiment will be specifically described.

In the unload operation, as described above, the slider 4 is retracted to the outside of the magnetic disk 2 by utilizing the back electromotive force of the spindle motor which is turned off and inertially rotated. Although the unloading operation method is adopted, it is performed in the following stepwise operation.

In the first stage, in the state shown in FIG. 7, the actuator 101 is driven by utilizing the counter electromotive force of the spindle motor which is turned off and rotates by inertia, whereby the suspension 5 along with the carriage 9 moves in the outer peripheral direction. It is moved (outward in the radial direction), and the lift tab 11 is engaged with the inclined portion 10 a of the ramp member 10. In the second stage, the lift tab 11 climbs the slope of the inclined portion 10a, and the dimple 14
c is separated from the slider mounting surface 15a, the hook gap S becomes zero, and the suspension body 14 and the hook 12 are brought into contact with each other. In the third stage, the lift tab 11 moves the inclined portion 10
By further climbing the slope of a, the locking portion 12a gives a pitching moment to the slider 4, and the inflow end 4a of the slider 4 is separated from the magnetic disk 2 as shown in FIG. In the fourth stage, the lift tab 11 moves the slope 10
By further climbing the slope of a, the slider 4 is completely separated from the magnetic disk 2. In the fifth stage, the lift tab 11 finishes climbing the inclined portion 10a and is moved to the holding portion 10b, so that the lift tab 11 is held.
Held in. Note that the load operation is performed through the reverse stage of this unload operation.

As shown in FIG. 10, since the hook 12 is near the inflow end 4a of the slider 4, the slider 4 is peeled off first from the inflow end 4a. In this case, the height of the lift tab 11 lifted by the ramp member 10 from the flying state of the slider is H2, and the lift tab 1 is lifted from the spring portion 13.
1 is A, the distance from the spring portion 13 to the hook 12 is L2, and the suspension body rise height S2 at the hook position is S2, the following equation (2) is obtained. It holds.

S2 = (H2 / A) · L2 (2) As is clear from this equation (2), in order to quickly unload the slider 4, it is necessary to increase S2 and the rising height. If H2 and the distance A are the same as in the conventional example, it is necessary to increase the distance L2 and reduce the hook gap S. However, the hook gap S needs to be larger than a predetermined gap so as not to impair the followability of the slider 4 on the surface of the rotating magnetic disk 2. Therefore, in this embodiment, the rotation direction of the magnetic disk 2 is directed from the lift tab 11 side to the suspension body 5, and the hook 12 is provided near the lift tab 11. As a result, the distance L2 of this embodiment during the unload operation is made larger than the conventional distance L1 (L1 <L
2) and the slider 4 can be quickly peeled off from the surface of the magnetic disk 2. This also applies to the load operation. Therefore, in this embodiment, it is possible to increase the data area of the magnetic disk 2 while reducing the possibility of the slider coming into contact with the protrusions in the non-flying guaranteed area of the magnetic disk and the possibility of attaching dust to improve the reliability. Can be planned.

In addition, since the distance from the lift tab 11 to the hook 12 is short, it is possible to prevent the suspension body 14 from flexing as in the conventional example at the time of unloading, and to prevent the lift delay due to flexure. it can. Therefore, it is not necessary to increase the mass of the suspension body 14 in order to increase the rigidity of the suspension body 14, and even when an external impact or the like is input to the device during operation, a large impact acceleration is generated due to the mass of the suspension body 14. This can be prevented. As a result, it is possible to prevent the slider 4 from being greatly excited and coming into contact with and damaging the magnetic disk 2.

Next, a magnetic disk device according to a second embodiment of the present invention will be described with reference to FIGS. 11 to 13. The second embodiment is different from the first embodiment as described below, and is basically the same as the first embodiment in other points.

In the second embodiment, the hook 12 is located on the central axis of the suspension 5 and is a substantially L-shaped strip integrally formed with the flexure 15. Also, hook 1
In the reference numeral 2, a front end locking portion 12a bent from the flexure 15 to the suspension side passes through the window hole 16 and faces the end portion of the window hole 16 on the lift tab 11 side in parallel at a predetermined interval S. Also in the second embodiment, the same function and effect can be obtained with the configuration common to the first embodiment. Moreover, in this second embodiment, the hook 12 has the lift tab 11
Since it is housed inside, not only is there a small spatial loss, but there is the advantage that the mass increase due to the hook 12 can be suppressed. Furthermore, in the second embodiment, it is possible to reduce the plate thickness of the suspension body 14 (for example, to about 15 μm) to reduce the mass of the suspension body 14. That is, as described above, when the position of the hook 12 is farther than the lift tab 11, even if the lift tab 11 is lifted by a ramp, the suspension body 14 is easily bent because it receives a reaction force due to the negative pressure of the slider 4. As a result, it is necessary to increase the mass of the suspension body 14 in order to increase the rigidity of the suspension body 14. On the other hand, since the hook 12 of the second embodiment functions at the position of the lift tab 11, the lift tab 11
Even if the suspension mass in the vicinity of the dimple 14c is reduced to reduce the rigidity, the lift delay is irrelevant. As a result, it was found that the suspension mass of several tens of mg was substantially reduced, and thus the impact resistance performance of 50 G or more was improved by the impact during operation.

Next, a magnetic disk device according to a third embodiment of the present invention will be described with reference to FIGS. The third embodiment is different from the first embodiment as described below, and is basically the same as the first embodiment in other points.

In the third embodiment, the first hook 20 is provided on the lift tab 11 side and the second hook 2 is provided near the dimple 14c.
1 is provided. The first hook 20 is the lift tab 11
To the suspension main body 14, the second hook 21 has a hook gap h to the suspension body 14. The hook gap g is set smaller than the hook gap h (g <h).

The flexure 15 is composed of a flat plate material having a size of about 25 μm. The flexure 15 is composed of a slider attachment portion 15a, a first hook 20, a flexible finger portion 15b, a second hook 21, and the like. First hook 20
Is formed in a frame shape extending from the tip end side of the flexure 15 and having a frame hole 20a. The second hooks 21 extend from the other end side of the slider attachment portion 15a, and are formed at the left and right sides of the dimple 14c with respect to the central axis. In the state before processing of the flexure 15 shown in FIG. 16, both the first hook 20 and the second hook 21 are bent upward at the position B, and are laterally bent at the position A, each of which is formed into an L shape. Here, similar wiring is provided in advance as described in the first embodiment. The bent flexure 15 is inserted from the lift tab 11 side. That is, the lift tab 11 is inserted into the frame hole 20a of the first hook 20, and the second hook 21 is inserted into the window hole 16. The slider 4 has the flexure 1 so that the inflow end 4a is on the lift tab 11 side as in the first embodiment.
5 is attached to the slider attachment portion 15a. In the third embodiment, the shortest gap g between the first hook 20 and the lift tab 11 is set to about 25 μm, and the gap h between the second hook 21 and the flange flat portion 14b is set to about 50 μm.

When the two hooks of the first hook 20 and the second hook 21 are used and the unloading operation is performed, first, the lift tab 11 rises and the dimple 14c separates from the slider mounting surface 15a. Then, the lift tab 11 and the first hook 20 come into contact with each other, and a pitch moment is applied to the slider 4 via the flexure 15. As a result, the slider 4 is peeled off from the inflow end 4a. Therefore, also in the third embodiment, the same effect as the first embodiment can be obtained.

In general, when the air film of the slider 4 disappears during high-speed unloading operation due to power interruption or the like, the slider 4 is likely to cause pitching vibration by the spring reaction force of the flexure 15 in the pitch direction. Therefore, the outflow end 4b of the slider and the disk are likely to come into contact with each other. However, in the third embodiment, by providing the second hook 21, the pitching movement of the slider 4 beyond the gap h due to the second hook 21 is restricted, so that the outflow end 4b of the slider 4 and the magnetic disk 2 are prevented. There is also an effect that can prevent the contact of.

Next, a magnetic disk device according to a fourth embodiment of the present invention will be described with reference to FIGS. The fourth embodiment is different from the first embodiment as described below and is basically the same as the first embodiment in other points.

When the magnetic disk 2 rotates at a high speed, the negative pressure of the slider 4 also increases, and the peeling force during the unloading operation increases. Therefore, the thin plate-shaped flexure 15
When the hook 12 is formed by, a large stress is applied to the hook 12 and there is a risk of plastic deformation. Therefore, in the fourth embodiment, instead of bending the thin plate-shaped flexure 15 into a U-shape to form the hook 12, the suspension body 14 is bent toward the flexure side, and a predetermined space S is provided between the flexure 15 and the flexure 15. It is called hook 22.

A U-shaped drawn lift tab 11 is provided at the tip of the suspension body 14. The suspension body 14 has a flat portion 14b as a whole and has a flangeless structure. Thin plate flexure 15
Is composed of a flexure body, a slider mounting portion 15a and a flexible finger portion 15b.

According to the fourth embodiment, the plastic deformation of the hook 22 can be prevented even if the peeling force during the unloading operation becomes large.

[0062]

As is apparent from the above description, according to the present invention, the magnetic disk device capable of performing the unloading operation at a higher speed than the loading operation by utilizing the airflow generated by the rotation of the magnetic disk. Can be obtained.

Further, according to the present invention, the slider is prevented from being exposed to the fluctuating flow generated by the collision of the air flow with the actuator, and the positioning accuracy and the flying property of the slider are improved and the magnetic disk of high reliability is obtained. The device can be obtained.

Further, according to the present invention, a magnetic disk drive capable of increasing the data area of the magnetic disk while reducing the delay in the takeoff and landing of the slider during loading / unloading and improving the reliability can be obtained. be able to.

[Brief description of drawings]

FIG. 1 is a plan view of a ramp load type magnetic disk device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a slider used in the magnetic disk device of FIG.

FIG. 3 is a schematic plan view of the magnetic disk device of FIG. 1 during an unloading operation.

FIG. 4 is a schematic plan view of the magnetic disk device of FIG. 1 when loaded.

5 is a side view of the main part of FIG.

6 is a perspective view of a suspension portion of the magnetic disk device of FIG.

FIG. 7 is a side view of FIG.

8 is an assembly perspective view of a suspension unit of the magnetic disk device of FIG.

9 is a bottom view of the suspension portion of the magnetic disk device of FIG. 1 before the slider is attached.

10 is a cross-sectional view for explaining the takeoff of the slider during the unloading operation of the magnetic disk device of FIG.

FIG. 11 is a perspective view of a main portion of a suspension portion in a ramp load type magnetic disk device according to a second embodiment of the present invention.

12 is a side view of a suspension portion of the magnetic disk device of FIG.

13 is a plan view of a flexure used in the magnetic disk device of FIG.

FIG. 14 is a perspective view of a main portion of a suspension portion in a ramp load type magnetic disk device according to a third embodiment of the present invention.

15 is a side view of a suspension portion of the magnetic disk device of FIG.

16 is a plan view of a flexure used in the magnetic disk device of FIG.

FIG. 17 is a perspective view of a suspension portion in a ramp load type magnetic disk device according to a fourth embodiment of the present invention.

FIG. 18 is a side view of FIG.

FIG. 19 is a schematic view of the conventional ramp load type magnetic disk device at the time of unloading operation.

20 is a schematic plan view of the magnetic disk device of FIG. 19 when loaded.

21 is a side view of the main part of FIG. 20. FIG.

22 is a cross-sectional view for explaining the takeoff of the slider during the unloading operation of the magnetic disk device of FIG.

[Explanation of symbols]

1 ... Base, 2 ... Magnetic disk, 3 ... Clamper, 4 ...
Slider, 4a ... Inflow end, 4b ... Outflow end, 4c ... Magnetic head, 5 ... Suspension, 6 ... Carriage, 7 ... Magnet part, 8 ... Coil, 9 ... Rotating shaft, 10 ... Ramp member, 10a ... Inclined part, 10b ... holding portion, 11 ... lift tab, 12 ... hook, 12a ... locking portion, 13 ... spring portion, 1
4 ... Suspension body, 14a ... Flange, 14b ...
Flat part, 14c ... Dimple, 15 ... Flexure, 15
a: slider mounting portion, 15b ... flexible finger portion, 15c ...
Flexure body, 16 ... Window hole, 17 ... Read / write terminal, 18 ... Wiring, 20 ... First hook, 21 ... Second hook, 30 ... Air flow, 31 ... Air flow force, 32 ... Unload direction, 100 ... Disk rotation mechanism, 101 ... Actuator, 102 ... Load / unload mechanism.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shigeo Nakamura             2880 Kozu, Odawara City, Kanagawa Stock Association             Company Hitachi Ltd. Storage Division F term (reference) 5D042 NA02 PA01 PA05 QA02 QA03                 5D059 AA01 BA01 CA26 DA26 DA30                       EA08 LA01                 5D076 AA01 BB01 CC05 DD20 EE01                       EE11 FF01 FF04 GG04 GG11

Claims (8)

[Claims] 1. A magnetic disk having a data area for recording information, a disk rotating mechanism for rotating the magnetic disk at a high speed by a spindle motor, and a slider having a magnetic head for recording / reproducing information. An actuator that moves the slider in a radial direction of the magnetic disk; and a load / unload mechanism that loads / unloads the slider with respect to a data area of the magnetic disk according to the movement of the actuator, The magnetic disk according to claim 1, wherein the disk rotating mechanism sets a rotational direction of the magnetic disk such that a force that pushes the actuator outward in the radial direction by the airflow generated by the disk rotation is generated during a load / unload operation. apparatus. 2. The magnetic disk drive according to claim 1, wherein when the spindle motor is turned off and the magnetic disk is rotated by inertia, the slider is unloaded. 3. A magnetic disk having a data area for recording information, a disk rotating mechanism for rotating the magnetic disk at a high speed by a spindle motor, and a slider having a magnetic head for recording / reproducing information. An actuator that moves the slider in a radial direction of the magnetic disk; and a load / unload mechanism that loads / unloads the slider with respect to a data area of the magnetic disk according to the movement of the actuator, The slider uses a negative pressure combined slider having a pocket for generating a negative pressure lower than atmospheric pressure,
A magnetic disk device, wherein the magnetic disk device is arranged at a tip portion of the actuator, and the disk rotation mechanism sets a rotation direction of the magnetic disk such that an air flow due to disk rotation flows from a tip side of the actuator. 4. A slider that floats on the surface of a rotating disk by utilizing relative motion with a magnetic disk, a flexure that supports the slider, a suspension body that supports the flexure and has a lift tab at the tip, and the suspension. A carriage for joining and rotating the other end of the main body and rotating the same; a ramp member for retracting the slider from the magnetic disk; and a hook for pulling up the slider by engaging the ramp member and the lift tab, The ramp load type magnetic disk device, wherein the hook is provided in the vicinity of the lift tab, and the magnetic disk is rotated in a direction from the lift tab side toward the suspension body. 5. The hook according to claim 4, wherein the hook extends from a tip end portion of the flexure and is bent so as to come into contact with the suspension body at a root portion of the lift tab.
The ramp type magnetic disk drive according to claim 1, wherein the slider has a slider inflow end on the lift tab side. 6. The lift tab according to claim 1, wherein the lift tab is formed by a U-shaped bend extending toward the front side of the slider and protruding toward the slider at the tip of the suspension body, and the hook is extended from the tip of the flexure. A ramp type magnetic disk device, wherein the ramp type magnetic disk device is formed to have a locking portion that extends and contacts the lift tab, and the slider has a slider inflow end on the lift tab side. 7. The ramp type magnetic disk drive according to claim 4, wherein the hook is provided on both the slider inflow end side and the slider outflow end side, and the slider is provided with a slider inflow end on the lift tab side. . 8. The lift tab according to claim 4, wherein the lift tab extends from a front end of the suspension body and is formed by a convex bending process on the slider side, and the hook extends from a vicinity of a joint portion between the lift tab and the suspension body. Further, the ramp type magnetic disk device is characterized in that it is formed with a locking portion that abuts on the flexure side so as to come into contact with the flexure at a predetermined gap, and the slider has a slider inflow end on the lift tab side. .