JP2001291349A - Magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic disk device provided with a structure where defect of mutual collision is surely avoidable when a pair of magnetic head sliders runs onto a loading ramp. SOLUTION: The magnetic disk device is provided with a magnetic disk 10, the pair of magnetic head sliders 8 and 9 opposed to mutually which is accessed the recording area of the surface and rear side surface of the magnetic disk 10, a head driving mechanism to perform loading/unloading of the magnetic head sliders 8 and 9 and the loading ramp 1 which has inclined planes 2a and 3a through which the magnetic head sliders 8 and 9 pass, respectively at the time of unloading on the surface and the rear side surface. The timing to which the both magnetic head sliders 8 and 9 run onto the inclined planes 2a and 3a at the time of unloading is made differ mutually. Thereby, although the magnetic head sliders 8 and 9 vibrate at the time of unloading, because both vibration phases are deviated, the magnetic head sliders 8 and 9 can avoid the defect of the mutual collision surely.

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 capable of avoiding mutual collision when a pair of magnetic head sliders ride on a ramp member.

[0002]

2. Description of the Related Art In recent years, the number of magnetic disk devices employing a ramp load method has been increasing. In this method, a load ramp having a substantially band-shaped planar shape is disposed radially outside the disk, and the magnetic head slider moves from the load ramp to the disk surface when the magnetic disk starts rotating ( Load), the magnetic disk rides on the load ramp when the rotation stops (unload).

A load ramp is provided at the end of the magnetic disk,
The magnetic disk has an inclined surface that is separated from the disk surface in the thickness direction as the distance from the magnetic disk in the radial direction increases. At the time of loading / unloading, the lift tab provided on the head suspension slides on the inclined surface. 1 magnetic disk
In a magnetic disk drive having two magnetic head sliders corresponding to the front and back surfaces of the magnetic disk, respectively, the load ramp has inclined surfaces on both the front and back surfaces on which both magnetic head sliders ride upon unloading. are doing.

[0004]

In the above-mentioned conventional magnetic disk drive provided with two magnetic head sliders for one magnetic disk, the moving speed is required when the magnetic head slider moves from the unload position to the load position. Is relatively gradual, so there is no problem. However, when moving from the loading position to the unloading position, there are the following problems.

In other words, both magnetic head sliders at the time of unloading move rapidly from the magnetic disk side to the load ramp side with a certain acceleration. They will suddenly come apart. As a result, the magnetic head sliders may collide with each other and cause damage such as chipping. When the damaged magnetic head slider accesses the recording area, it causes problems such as scratching the recording surface. In particular, in the case of a large-capacity magnetic disk device, the above-mentioned problem becomes more remarkable because the magnetic disk is thinner and the upper and lower magnetic head sliders are closer.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a magnetic disk drive having a structure capable of reliably avoiding a problem that a pair of magnetic head sliders collide with each other when riding on a load ramp.

[0007]

In order to achieve the above object, a magnetic disk drive according to the present invention comprises a magnetic disk and a pair of magnetic disks which access a recording area on the front and back surfaces of the magnetic disk. A magnetic disk drive comprising: a head slider; a head drive mechanism for loading / unloading the magnetic head slider; and a ramp member having, on the front and rear surfaces, inclined surfaces through which the pair of magnetic head sliders pass when unloaded. At the time of unloading, the timings at which both magnetic head sliders ride on the inclined surface are different from each other.

In the magnetic disk drive of the present invention, both magnetic head sliders vibrate due to their acceleration when riding on the ramp member, but the phases of the vibrations are shifted from each other. Does not overlap. Therefore, it is possible to reliably prevent a problem in which the two magnetic head sliders collide, and to improve the reliability of the device.

Here, in a preferred magnetic disk drive of the present invention, the head driving mechanism provides an offset in a time for driving the magnetic head slider.

A support member for supporting the magnetic head slider provided in the head drive mechanism includes a pair of lift tabs corresponding to the magnetic head slider, and the pair of lift tabs are provided in the moving direction of the magnetic head slider. Preferably, an offset is provided. In this case, it is possible to realize a mechanism for making the timing of riding on the inclined surface different from each other with a simple structure.

Alternatively, instead of the above, on both inclined surfaces,
It is also a preferable embodiment that an offset is provided in the moving direction of the magnetic head slider. In this case as well, a mechanism for making the timings of riding on the inclined surface different from each other can be realized with a simple structure.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments of the present invention with reference to the drawings. FIG.
FIG. 2 is a side view showing a main part of the ramp-load type magnetic disk device according to the first embodiment of the present invention in a loaded state.

The magnetic disk drive of this embodiment includes a magnetic disk 10 rotatably / stoppably supported, a load ramp 1 (ramp member) having a substantially band-shaped planar shape on the outer side in the radial direction of the disk, and a magnetic disk 10. First and second head assemblies 18 and 19 that move between the front and back surfaces of the first and second load ramps 1.

The first head assembly 18 includes a magnetic head slider 8 having a write / read gap for accessing a recording area on the front and back surfaces of the magnetic disk 10, and a magnetic disk 10 holding the magnetic head slider 8. Head suspension 6 that presses against a predetermined load
And The second head assembly 19 includes the magnetic head slider 9 and the head suspension 7 having the same structure as the first head assembly 18.

The head suspensions 6 and 7 constitute support members for supporting the magnetic head sliders 8 and 9, respectively.
Lift tabs 4 and 5 are provided at one end in the moving direction of the magnetic head slider (left and right in FIG. 1), and lift tabs 20 and 2 are provided at the other end.
1 each. The magnetic head sliders 8, 9 are loaded / unloaded by a head drive mechanism including head suspensions 6, 7. Head suspension 6, 7
When the lift tabs 4 and 5 do not contact the load ramp 1, they move together while maintaining a state substantially parallel to each other, and when contacting the load ramp 1, the lift tabs 4 and 5 rotate around the lift tabs 4 and 5 respectively. Move.

In the load ramp 1, the central portion in the thickness direction coincides with the extension line 10a in the radial direction of the disk.
It has an inclined shape protruding from the side. As a result, the first and second inclined surfaces 2a and 3a are formed so as to move away from the extension line 10a as the distance from the disk radial direction increases.
The load ramp 1 has flat surfaces 2b, 3b continuous with the first and second inclined surfaces 2a, 3a, respectively.

The absolute value of the angle A between the extension line 10a and the first inclined surface 2a and the absolute value of the angle B between the extension line 10a and the second inclined surface 3a are equal to each other, and are set to, for example, 30 °. . However, the absolute values of the inclination angles of both the inclined surfaces 2a and 3a do not necessarily have to be the same, and in this case, the same effect as when the absolute values are the same can be obtained.

The lengths D, E of the first and second inclined surfaces 2a, 3a are substantially equal to each other. The second inclined surface 3a is the first
It is offset to the outside of the disk by a distance C from the inclined surface 2a. Thus, when unloading, the load ramp 1
A structure is obtained in which the lift tab 4 moving to the side contacts the first inclined surface 2a side and then the lift tab 5 contacts the second inclined surface 3a. Alternatively, the offset relationship between the upper inclined surface 2a and the lower inclined surface 3a can be reversed by retracting the first inclined surface 2a with respect to the second inclined surface 3a. In this case, the same effect as above can be obtained.

Next, the operation of the magnetic disk drive according to this embodiment will be described. 2 (a) to 2 (d)
FIG. 3 is a side view showing step by step each state when the first and second head assemblies 18 and 19 move from the load position to the unload position in FIG. 1.

First and second head assemblies 18, 1
9 starts moving from the load position in FIG. 1 toward the load ramp 1, first, as shown in FIG.
The lift tab 4 of the first head assembly 18 starts to contact the first inclined surface 2a of the load ramp 1. Thereby, the magnetic head slider 8 starts to separate from the magnetic disk 10 while maintaining a state substantially parallel to the magnetic disk 10. At this time, since the second inclined surface 3a is retracted outward in the head moving direction, the lift tab 5 of the second head assembly 19 does not yet contact the lower inclined surface 3a.

Next, as shown in FIG. 2B, in the first head assembly 18, when the lift tab 4 slides on the first inclined surface 2a and rides on the flat surface 2b, the magnetic head is caused by acceleration. The slider 8 is instantaneously lifted from a state parallel to the magnetic disk 10. At this time, the second
In the head assembly 19, the lift tab 5 starts to contact the second inclined surface 3a and gradually moves downward, and the magnetic head slider 9 starts to separate from the magnetic disk 10. Further, the lift tab 5 is flattened 3b later than the lift tab 4.
, The magnetic head slider 9 instantaneously descends from the parallel state due to the acceleration.

Subsequently, as shown in FIG. 2 (c), when the lift tab 4 sufficiently rides on the flat surface 2b, the magnetic head slider 8 which has jumped up suddenly descends. Thereafter, the lift tab 5 rides sufficiently on the flat surface 3b, so that the lowered magnetic head slider 9 rapidly rises. Therefore, since the uppermost point and the lowermost point of both of the magnetic head sliders 8 and 9 are displaced in the head moving direction, a problem of mutual collision is reliably avoided.

Next, as shown in FIG. 2 (d), the lift tabs 4, 5 further slide on the flat surfaces 2b, 3b of the load ramp 1, and the lift tabs 20, 21 on the rear side are flat.
When riding on 3b, the first and second head assemblies 18 and 19 are in an unload state in which the first and second head assemblies 18 and 19 face each other at a predetermined interval.

FIG. 3 is a diagram showing the locus of movement of the magnetic head sliders 8 and 9 in this embodiment. In the figure,
Magnetic head sliders 8 and 9 shown in FIGS.
Reference numerals 11 and 12 denote the movement trajectories of the central portion during the movement of
Indicated by. Magnetic head sliders 8, 9 (see FIG. 2)
Vibrates when riding on the load ramp 1 due to acceleration at the time of unloading. However, since the positions of the inclined surfaces 2a and 3a in the head moving direction are different from each other, the lowest point of the magnetic head slider 8 is 11a and the uppermost point 12a of the magnetic head slider 9 are surely offset in the head moving direction.

Next, a second embodiment of the present invention will be described. FIG. 4 is a side view showing a main part of the magnetic disk drive according to the embodiment in a loaded state. In the figure, different reference numerals are given to members other than members having the same configuration as that of the first embodiment.

In this embodiment, the offset of the vibration phase is realized not by the inclined state of the load ramp 1 but by the difference in the configuration of the first and second head assemblies 18 and 19. In other words, the lift tab 16 on the head suspension 17 side protrudes longer toward the load ramp 13 than the lift tab 5 on the head suspension 7 side, so that the lift tabs 16 and 5 are provided with an offset in the moving direction of the magnetic head sliders 8 and 9. . On the other hand, the load ramp 13 has a first inclined surface 14a and a second inclined surface 15a.
a has an equal angle to each other, has a vertically symmetrical shape that does not offset forward and backward, and has inclined surfaces 14a, 15
a have continuous flat surfaces 14b and 15b, respectively.

Also according to the present embodiment, at the time of unloading, the lift tab 16 starts to contact the first inclined surface 14a prior to the lift tab 5, and thereafter, the lift tab 5
Starts contacting the second inclined surface 15a, so that the movement trajectory (oscillation phase) of the magnetic head sliders 8 and 9 becomes the same as in FIG. 3, and the same effect as that of the first embodiment can be obtained.

Further, in the first and second embodiments, the magnetic disk drive provided with two magnetic head sliders 8 and 9 for one magnetic disk 10 has been described.
The present invention is not limited to this, and the present invention can be applied to a magnetic disk device having a plurality of sets of one magnetic disk and two magnetic head sliders.

Although the present invention has been described based on the preferred embodiment, the magnetic disk drive of the present invention is not limited to the configuration of the above-described embodiment, but rather the configuration of the above-described embodiment. Various modifications and alterations of the magnetic disk drive are also included in the scope of the present invention.

[0030]

As described above, according to the magnetic disk drive of the present invention, it is possible to reliably avoid the problem that the pair of magnetic head sliders collide with each other when riding on the load ramp.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of a magnetic disk drive according to a first embodiment of the present invention in a loaded state.

FIGS. 2A to 2D are side views illustrating the operation of the magnetic disk drive according to the first embodiment, in which first and second head assemblies move from a load position to an unload position. Each state is shown step by step.

FIG. 3 is a side view schematically showing a movement locus of a magnetic head slider according to the first embodiment.

FIG. 4 is a side view showing a main part of a magnetic disk drive according to a second embodiment of the present invention in a loaded state.

[Explanation of symbols]

 1: load ramp (ramp member) 2: first inclined surface 3: second inclined surface 4, 5: lift tab 6, 7: head suspension 8, 9: magnetic head slider 10: magnetic disk 10a: extension line in the disk radial direction 16: Lift tab 18: First head assembly 19: Second head assembly 20, 21: Lift tab A, B: Angle D, E: Length C: Distance

Claims (4)

[Claims] 1. A magnetic disk, a pair of magnetic head sliders facing each other for accessing recording areas on the front and back surfaces of the magnetic disk, a head drive mechanism for loading / unloading the magnetic head slider, and an unloader. In a magnetic disk drive comprising a ramp member having an inclined surface on the front surface and the back surface through which the pair of magnetic head sliders respectively pass at the time of loading, the timing at which both magnetic head sliders ride on the inclined surface at the time of unloading is determined. A magnetic disk drive characterized by the following. 2. The magnetic disk drive according to claim 1, wherein the head drive mechanism sets an offset in a time for driving the magnetic head slider. 3. A supporting member for supporting the magnetic head slider provided in the head drive mechanism, comprising a pair of lift tabs corresponding to the magnetic head slider, wherein the pair of lift tabs are provided in the moving direction of the magnetic head slider. 3. The magnetic disk drive according to claim 1, wherein an offset is provided. 4. The magnetic disk drive according to claim 1, wherein both inclined surfaces are provided with an offset in a moving direction of the magnetic head slider.