KR20080084697A - Magnetic disk apparatus and head slider - Google Patents

Abstract

A magnetic disk apparatus and a head slider are provided to prevent variation in a floating amount due to a groove by equalizing the pressure due to fluid, thereby stabilizing a rise. A magnetic disk apparatus comprises a magnetic disc having a data zone, a servo zone, and a groove on its surface, a spindle motor for rotating the magnetic disk, an actuator, and a head slider(112). The actuator drives an arm in the radial direction of the magnetic disk. The head slider includes a magnetic head(40) installed on the front end of the arm, and a bearing surface having plural pads. The outflow end of the pads is shaped like a wedge.

Description

Magnetic Disk Unit and Head Slider {MAGNETIC DISK APPARATUS AND HEAD SLIDER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device and a head slider which floats a magnetic head against a rotating magnetic disk and reads / writes tracks of the magnetic disk in the magnetic head. A magnetic disk device and a head slider for stabilization.

In recent years, in order to improve the storage density of magnetic disks, the development of discrete media in which physical irregularities are formed on the magnetic disk surface and the tracks are separated from each other is in progress.

Fig. 11 is a front view of the discrete media, Fig. 12 is an explanatory view of a conventional head slider, and Fig. 13 is an explanatory view of a fluid bearing surface of the conventional head slider.

As shown in Fig. 11, in the discrete track medium 10, a data zone 12 for recording / reproducing normal information and a servo zone 11 in which servo information or the like used for head positioning is previously recorded are mixed. do.

In these two zones, the surface shape, such as the form of the groove | channel processed on the surface of the medium 10, also differs from the difference in the function. On the data zone 12, the groove 12a along the circumferential direction which isolate | separates each track 12b is processed. On the other hand, the servo zone 11 has a width B, and the servo information recording area 11b is separated by the groove 11a in the medium radial direction.

The servo information has gray codes (representing track numbers), preambles and positional information for timing control and the like, and these are recorded in the servo information recording area 11b separated by the grooves 11a. The servo information is formed in the radial zone in the servo zone 11 so as to be formed at the same position in the radial direction of the medium with respect to each track formed in the circumferential direction of the medium 10. To prevent interference.

In this way, since the surface structure of the medium 10 is different in the two zones 11 and 12, the fluid resistance of the surface of the medium 10 in each zone 11 and 12 is also different. For this reason, the floating amount of the floating head slider on which the head for recording / reproducing information is mounted also changes when the servo zone 11 is injured and when the data zone 12 is injured. .

As shown in FIG. 12, the head slider 20 resists the surface of the medium 10 and floats due to the fluid pressure caused by the movement of the medium 10. As shown in FIG. With the recent improvement in recording density, the flotation amount is about 10 nm. An electromagnetic conversion element (lead / light element) 24 is provided on the side of the head slider 20. The left end of the head slider 20 in Fig. 12 is the inflow end of the fluid, and the right end is the outflow end.

The head slider 20 not only floats the electromagnetic conversion element 24 from the surface of the medium 10, but also controls the floating posture. For this reason, as shown in FIG. 13, the front pad 21 which has a comparatively large area is provided in the inflow end side, and the rear pad 23 of the area equivalent to the width Wh of the electromagnetic conversion element 24 in the outflow end side. Is installing.

Due to the difference in the area of the front pad 21 and the rear pad 23, the slider 20 floats so that the outflow end side (electromagnetic conversion element 24) side is closer to the medium 10 than the inflow end. In other words, at the leading end edge E, the floating gap is smallest. A pair of intermediate pads 22 provided between the front pads 21 and the rear pads 23 are provided near the upper and lower ends of the bearing surface to control the attitude of the slider 20 in the track crossing direction.

FIG. 12 is a cross-sectional view of the rear pad 23 of FIG. 13, in which the slider base 20 is provided with a rear pad 23 composed of two layers of films. 12 shows the layer structure in steps.

Fig. 14 shows an example in which the head slider 20 of length L measures the amount of injury when floating on the medium 10 having a non-uniform surface groove structure as described in Figs. 11 and 12. . Here, the groove depth of the surface of the medium 10 is constantly 15 nm (nanometer). Fig. 14 shows time (moving position) on the horizontal axis and floating amount on the vertical axis. As shown in Fig. 14, the floating amount of the head slider 20 is approximately 10 nm, which is rapidly changing about 5 nm.

This is because when the pad 23 at the outermost end of the head slider 20 passes over the servo zone 11, the generated pressure changes due to the change in the fluid resistance on the surface of the servo zone 11. It is a phenomenon caused by. In the case where the floating amount changes greatly in this way, the signal level of the reproduction signal of the electromagnetic conversion element 24 changes, resulting in a problem that information cannot be reproduced or that accurate information cannot be recorded.

In order to prevent such a phenomenon, it is conventionally proposed to prevent the floating amount change in the servo zone 11 by making the length L of the slider 20 larger than the width B of the servo zone 11. (For example, refer patent document 1).

Moreover, in another conventional technique, it is proposed to prevent the floating amount change by optimizing the ratio of the total area of the pads of the head slider 20 to the total area of the convex portions of the medium 10 directly below the pads (Example See, for example, Patent Document 2).

[Patent Document 1] Japanese Patent Application Laid-open No. Hei 5-81808

[Patent Document 2] Japanese Patent Application Laid-Open No. 2005-50482

However, in the first conventional technique, when the floating amount is large, it is effective for decreasing the fluctuation range relative to the large floating amount, but when the floating amount is small, the relative fluctuation range is large, and it is difficult to suppress the floating amount change.

Also in the second conventional technology, as shown in Fig. 5 of Patent Document 1, when the floating amount is relatively large at 20 nm, it is effective for reducing the variation width relatively, but when the floating amount is small (for example, 10 nm), the relative fluctuation range becomes large, and it is difficult to suppress the floating amount change.

Accordingly, an object of the present invention is to provide a magnetic disk device and a head slider for suppressing the change in the amount of floating when passing through a servo zone of the discrete media.

Another object of the present invention is to provide a magnetic disk device and a head slider for realizing accurate recording / reproducing by suppressing a change in the amount of floating when passing through the servo zone of the discrete media.

Further, another object of the present invention is to provide a magnetic disk device and a head slider for realizing high density recording / reproducing by suppressing the change in the floating amount even when the floating amount for the discrete media is reduced.

Further, another object of the present invention is to provide a magnetic disk apparatus and a head slider for suppressing the floating amount variation and realizing the floating amount that is optimal for high density of vertical magnetic recording.

In order to achieve this object, the magnetic disk apparatus of the present invention includes a magnetic disk having a data zone and a servo zone, and having a groove on a surface, a spindle motor for rotating the magnetic disk, and an arm in a radial direction of the magnetic disk. And a head slider including an actuator for driving the motor and a magnetic head provided at the tip of the arm, the head slider having a bearing surface having a plurality of pads and the magnetic head provided at the outlet end side. The pad shape of the outflow end was configured in a wedge shape in which the width narrowed toward the outflow end.

Further, the head slider of the present invention has a data zone and a servo zone, and has a bearing surface having a magnetic pad and a plurality of pads provided on an outlet end side in a head slider which floats on a magnetic disk having a groove on a surface thereof. The pad shape of the outflow end was comprised in the wedge shape which narrows toward the outflow end among these pads.

In the present invention, preferably, the wedge-shaped length of the pad at the outflow end is longer than the maximum width of the servo zone of the magnetic disk.

Moreover, in this invention, Preferably the vertex angle of the wedge shape of the pad of the said outflow end is 90 degrees or less.

In the present invention, preferably, the pad at the outflow end is composed of at least two layers, and the surface layer is formed in a wedge shape among the two layers.

In the present invention, preferably, the pad at the outflow end has a surface layer formed in a wedge shape, and a head component layer provided below the surface layer to constitute the magnetic head.

In the present invention, preferably, the head structure layer has a width for constituting the magnetic head at the discharging end, and is configured in the shape of the surface layer other than the discharging end.

Moreover, in this invention, Preferably the wedge shape of the pad of the said outflow end has a vertex.

In the present invention, preferably, the wedge shape of the pad at the outflow end has a straight portion at the outflow end.

In the present invention, preferably, the magnetic disk is provided in the radial direction of the magnetic disk and the data zone composed of a plurality of tracks separated by grooves along the circumferential direction of the magnetic disk. It consists of a separate servo zone.

In the present invention, preferably, the head slider has a front pad provided at the inlet end and a rear pad provided at the outlet end.

Among the plurality of pads of the head slider, since the pad shape of the outflow end is formed in a wedge shape that becomes narrow toward the outflow end, the pressure distribution can be improved and the pressure by the fluid can be averaged, so that the discrete media The fluctuation of the floating amount due to the groove can be suppressed, so that stable injury can be achieved. In addition, it is possible to stably float with a small floating amount, so that high density recording / reproducing can be accurately realized.

EMBODIMENT OF THE INVENTION Hereinafter, although embodiment of this invention is described in order of a magnetic disk apparatus, the 1st embodiment of a magnetic head slider, the 2nd embodiment of a magnetic head slider, and another embodiment, this invention is not limited to this embodiment. .

(Magnetic disk unit)

Fig. 1 is a configuration diagram of an embodiment of a magnetic disk device of the present invention, showing a magnetic disk device of a vertical recording method as an example. As shown in Fig. 1, a magnetic disk 102, which is a vertical magnetic storage medium, is provided on the rotating shaft 104 of the spindle motor. The spindle motor rotates the rotating shaft 104 to rotate the magnetic disk 102. The arm 108 is rotated by the VCM (Voice Coil Motor) 106 about the rotation shaft 110. At the tip of this arm 108, a suspension 116 is mounted.

At the tip of the suspension 116, a head slider 112 mounted with a magnetic head (lead element and light element) is provided. In addition, a ramp rod mechanism 114 is provided which pulls the magnetic head out of the magnetic disk 102 and parks it. These mechanisms are housed in the device housing 100.

This magnetic disk 102 is composed of the discrete media described with reference to FIGS. 11 and 12. In addition, in the magnetic disk apparatus, the arm 108 is rotated in the radial direction of the magnetic disk 102 by the VCM 106 to move the head slider 112 including the magnetic head to the desired track of the magnetic disk 102. Decide on your location.

As described with reference to Figs. 11 and 12, in the magnetic disk 102, tracks are formed on concentric circles by grooves, and the magnetic head is rotated by the rotation of the magnetic disk 102. The sector data is read and written.

The magnetic head is composed of a lead element and a light (vertical recording) element, and a lead element including a magnetoresistive (MR) element is laminated on the head slider, and a light element including a light coil is laminated thereon. do.

(1st Embodiment of a Head Slider)

Fig. 2 is a view showing the bearing surface shape of the head slider of the first embodiment of the present invention, Fig. 3 is a cross-sectional view thereof, and Fig. 4 is an explanatory view of the rear pads of Figs.

As shown in Fig. 2, the head slider 112 is provided with a front pad 30 having a relatively large area at the inlet end side, and has an area equal to the width Wh of the electromagnetic conversion element (magnetic head) 40 at the outlet end side. The rear pad 34 is provided. As shown in Fig. 3, the slider 112 has an outflow end side (electromagnetic conversion element 40) rather than the inflow end according to the difference between the areas of the front pad 30 and the rear pad 34. Injured to approach. In other words, the floating gap is the smallest at the exit end edge P.

In this example, a pair of intermediate pads 32 provided between the front pad 30 and the rear pad 34 are provided near the upper and lower ends of the bearing surface to control the attitude of the slider 112 in the track crossing direction. .

As shown in Figs. 2 and 3, the rear pad 34, which is the most outgoing pad, has a head structure layer 37 and a surface layer provided on the head component layer 37 on the slider base 31. 36), the surface layer 36 is formed in a wedge shape whose width gradually narrows toward the outflow end. The vertex angle of the wedge is represented by P.

As shown in the cross-sectional shape along the slider center line CC 'of the outermost outflow end pad 34 of Figure 3, has a step (d _s = 2 ㎚) from the outermost outflow end pad layer 36, a layer to be the head is configured 37 is provided and this layer 37 also takes the structure which becomes narrow toward an outflow end.

However, in the head constitution layer 37, the width Wh for constituting the head is secured at the most outflow end. Thus, by constructing the surface layer 36 of the outermost exit pad 34 in the shape of a wedge, in the conventional example of Fig. 13, the floating gap is minimized at the linear outermost exit edge E in this example. In the example, on the vertex P of the wedge-shaped portion, the floating gap is minimized.

The length Lw of the portion 38 constituting the wedge shape of the surface layer 36 is set to be larger than the maximum value of the width B of the servo zone 11 on the medium 102.

Thus, the reason why the wedge-shaped part was formed in the back pad 34 is demonstrated. Fig. 4 shows the calculation result of the pressure distribution along the centerline CC ′ of the conventional head slider of Fig. 13, where the horizontal axis is the position (distance) y with respect to the inlet end of the slider, and the vertical axis is the pressure.

In Fig. 4, the thin line shows the pressure distribution when the slider 20 in Fig. 13 floats on the data zone, and the thick line shows the pressure distribution when the outflow end edge E is on the servo zone. In addition, the part shown by the servo zone range in the figure corresponds to a servo zone.

In any case, a large pressure is generated in the outermost pad 23 of the slider 20. On the upstream side (inlet end side) of the outflow end edge E, the gas is compressed to increase the pressure, while on the downstream side (outflow end side), the gap becomes large, and the gas expands rapidly and the pressure decreases. Thus, at the leading end edge E, the pressure takes a peak value.

Further, when the outermost end edge E is on the servo zone 11, a larger pressure is generated as compared with the case on the data zone 12. As a result, the floating amount becomes large at the time when the exit end edge E moves from the data zone to the servo zone. In Fig. 14, at the time point t1 at which the floating amount starts to change suddenly, the most proximal end edge E of the head slider 20 coincides with the boundary between the data zone 12 and the servo zone 11 (arrow in Fig. 3). It's time. In addition, the outermost end edge E requires a certain width Wh to form the head 24, and the larger the width, the larger the floating amount change.

In other words, the pad at the outflow end has an influence on the pressure at the outflow end edge E. FIG. Therefore, the floating amount change is suppressed by the shape of the pad 34 at the most outflow end.

5 shows a state in which the servo zone 11 moves the wedge-shaped portion 38 of the surface layer 36 of the outermost pad 34 of the head slider 112 by the rotation of the disk 102. Doing. The region 39 (an oblique portion in the drawing) in which the wedge-shaped portion 38 and the servo zone 11 overlap is trapezoidal as shown in the figure.

When this outflow end pad 34 passes over the servo zone 11, the pressure at this portion increases, but when the pad surface layer 36 is a wedge 38, the wedge 38 The effect of outflow of the high pressure gas to the side of the side becomes larger, and in particular, the effect increases as the vertex P of the wedge-shaped portion 38 approaches. Therefore, in the conventional example, while the influence of the servo zone passage was concentrated on the pressure at the outermost end edge E, the pressure distribution is improved and relaxed in this embodiment.

Fig. 7 shows the calculation result of the pressure distribution along the slider center line CC 'in the present embodiment in an enlarged manner near the outermost end pad portion 34. Figs. Three pressure distributions are shown. In Fig. 7, the horizontal axis is the position (distance) on the slider, and the vertical axis is the pressure. 7 shows the pressure distribution corresponding to the relative positional relationship between the servo zone and the slider. The dotted line shows the pressure distribution in the case where the slider 112 does not pass on the servo zone, and the thick black line shows the servo zone 11 at the inlet end side of the wedge-shaped portion 38 of the outermost end pad 34. If there is (that is, the vertex P of the wedge-shaped portion 38 is not included in the servo zone 11), the thin line indicates that the vertex P of the wedge-shaped portion 38 of the slider is the position of the servo zone 11. Corresponds to the case where it coincides with the center.

In comparison with FIG. 7 and FIG. 4 (the conventional example), in FIG. 4, the pressure of the outflow end is greatly different depending on the positional relationship between the most outflow end edge E and the servo zone 11. In the case of 7, it can be seen that a large difference disappears in the magnitude of the pressure according to the positional relationship between the servo zone 11 and the slider 112.

Thus, by making the outermost pad surface layer 36 into the wedge-shaped part 38, the influence which the outermost pad 34 passes through the servo zone 11 can be reduced.

Secondly, in this embodiment, the generating force at the discharging pad portion is adjusted. As shown in Fig. 5, when the overlap region 39 is located at a portion closer to the outflow end of the wedge-shaped portion 38, the floating gap is small on average, and as a result, the generated pressure increases, but the overlap region ( The average width Wr of 39) is small.

On the other hand, when the overlapped region 39 is on the inflow end side, the gap is large and the generated pressure is small, but the width Wr of the overlapped region is large. Therefore, the force [= area (Wr x B (servo pattern width)) x pressure] generated in the overlapping region 39 is determined when the overlapping region 39 is at the inflow end side and at the outflow end side. There is no big difference, and the relative difference of generating force is small in any relative positional relationship.

In the conventional head slider shown in Fig. 13, since the generating force changes rapidly before and after the position where the servo zone 11 coincides with the outflow edge C, a sudden change in the floating amount occurs. However, in the head slider of this embodiment shown in FIG. 2, even if the servo zone 11 reaches the outflow end point P through the wedge-shaped part 38, the generating force is largely changed by the wedge-shaped effect. I never do that. Thus, no sudden floating fluctuations occur.

Fig. 6 is a calculation chart showing the floating amount fluctuation characteristics of the head slider according to the present embodiment (Fig. 2) and the conventional head slider (Fig. 13). The thick line indicates the change in the amount of float when the head slider of the present embodiment passes through the servo zone 11 on the medium 102, and the thin line passes the servo pattern by the conventional head slider (Fig. 13). Indicates a change in the amount of injury.

As shown in Fig. 6, in the head slider 112 according to the present embodiment, the bearing surface shape may be different, and the normal floating amount Hs is about 9.2 nm, which is shown in the conventional Fig. 13. Although slightly different from 9.4 nm in the case of the head slider, it can be seen that the change in the floating amount is clearly small.

Also in this embodiment, as in the prior art, the boundary between the servo zone 11 and the data zone 12 has the outermost exit point P of the wedge-shaped portion 38 of the surface layer 36 of the outermost exit pad 34. There is a tendency for the amount of levitation to increase from the time point t1 at which it reaches. The fluctuation range is much smaller than the conventional ΔH.

As described above, in the present embodiment, the factors in which the floating amount fluctuations during the passage of the servo zone are small are suppressed as described above, and the effect of improving the pressure distribution by the side surfaces and generating force in the outflow end pad portion is adjusted. .

As shown in FIG. 6, the floating amount gradually increases from the time point t2 before the time t1 where the most outflowing point P coincides with the boundary between the data zone 12 and the servo zone 11. This is due to the effect of the wedge shape in the overlapped region 39 of the wedge-shaped portion 38 and the servo zone 11 at the time when the servo zone 11 is on the inflow end side of the wedge-shaped portion 38. Is a result of the relatively large incidence and the amount of injury due to this influence.

As a result, in the head slider shown in this embodiment, the floating amount change accompanying the servo zone 11 passing through the outermost exit pad portion 34 is averaged, so that the crest value of the floating variation can be reduced. .

The above-described explanation is that the shape effect of the surface layer 36 of the outmost pad 34 is increased because the length Lw of the wedge-shaped portion 38 is larger than the maximum width B of the servo zone. It is apparent from.

Moreover, in order to fully exhibit this effect, it is preferable that the vertex angle (theta) (refer FIG. 2) of the wedge-shaped part 38 is an acute angle. Fig. 8 is a result of calculating the floating amount fluctuation crest value ΔH (difference between the maximum floating amount and normal floating amount in Fig. 6) for the wedge-shaped vertex angle θ.

8 shows that in the head slider of this embodiment, the vertex angle θ is set to 78 degrees, and the floating amount fluctuation crest value ΔH = 1 nm is suppressed to be sufficiently small. Further, it can be seen that when the vertex angle θ exceeds 90 degrees, the floating amount fluctuation crest value ΔH increases rapidly. For this reason, preferably, the vertex angle of the wedge-shaped part 38 is 90 degrees or less.

In addition, in this embodiment, it is effective to follow the same wedge shape as that of the pad surface layer 36 also as for the layer 37 which a head is comprised as shown in FIG. In fact, the step between the layer 37 and the pad surface layer 36 of which the head is formed is about 2 nm, and it is more effective to make this layer 37 also a shape close to the wedge shape.

(2nd Embodiment of Magnetic Head Slider)

9 and 10 are explanatory views of the second embodiment of the magnetic head slider of the present invention, showing the shape of only the most outflow end pad surface layer 36. In the first embodiment of FIG. 2, the wedge-shaped portion 38 symmetrical with respect to the centerline of the head slider 112 is shown.

However, depending on design conditions, even if it is the asymmetric wedge-shaped part 38A as shown in FIG. 9, an effect will not be impaired at all. Similarly, as shown in Fig. 10, a trapezoidal wedge-shaped portion 38B having a short side on the outflow end side can be formed. In the case of Fig. 10, however, the effect decreases as compared with the case of the wedge shape.

(Other embodiment)

In the above embodiment, the magnetic disk device has been described as an example of the vertical magnetic disk device. However, the magnetic disk device can also be applied to other disk devices such as a horizontal magnetic recording device and an optical assist vertical magnetic disk device. As described above, in the case where the rear pad is trapezoidal, the rear pad may be formed in one layer. In addition, the discrete media is not limited to the configuration in FIG. 11 and can be applied to what is called other discrete media. In addition, the present invention can be applied to a configuration in which no intermediate pad is provided.

As mentioned above, although this invention was demonstrated in embodiment, this invention can be variously modified within the range of the meaning, and this is not excluded from the scope of this invention.

(Appendix 1) A magnetic disk having a data zone and a servo zone and having a groove on its surface, a spindle motor for rotating the magnetic disk, an actuator for driving an arm in the radial direction of the magnetic disk, and a tip of the arm. And a head slider including a magnetic head provided, wherein the head slider has a bearing surface having a plurality of pads and a magnetic head provided on an outlet end side. A magnetic disk device, characterized in that configured in a wedge shape that narrows in width.

(Supplementary note 2) The magnetic disk device according to Supplementary note 1, wherein the wedge-shaped length of the pad at the outflow end is longer than the maximum width of the servo zone of the magnetic disk.

(Supplementary Note 3) The magnetic disk apparatus of Supplementary Note 1, wherein the wedge-shaped vertex angle of the pad at the outflow end is 90 degrees or less.

(Supplementary Note 4) The magnetic disk apparatus of Supplementary Note 1, wherein the pad at the outflow end is composed of at least two layers, and the surface layer is formed in a wedge shape among the two layers.

(Supplementary Note 5) The magnetic disk device according to Supplementary Note 1, wherein the pad at the outflow end has a surface layer formed in a wedge shape and a head structure layer provided below the surface layer to constitute the magnetic head.

(Supplementary Note 6) The magnetic disk device according to Supplementary Note 5, wherein the head structure layer has a width for constituting the magnetic head at the outermost end and is configured in the shape of the surface layer other than the outermost end.

(Supplementary Note 7) The magnetic disk apparatus of Supplementary Note 1, wherein the wedge shape of the pad at the outflow end has a vertex.

(Supplementary Note 8) The magnetic disk device according to Supplementary Note 1, wherein the wedge shape of the pad at the outlet end has a straight portion at the outlet end.

(Supplementary Note 9) The magnetic disk includes the data zone including a plurality of tracks separated by grooves along the circumferential direction of the magnetic disk, and a servo zone provided in the radial direction of the magnetic disk and separated by grooves. The magnetic disk device according to Supplementary Note 1, comprising:

(Supplementary note 10) The magnetic disk device according to Supplementary note 1, wherein the head slider has a front pad provided at the inlet end and a rear pad provided at the outlet end.

(Appendix 11) A head slider which has a data zone and a servo zone and floats on a magnetic disk having a groove on its surface, comprising: the magnetic head provided on the outflow end side and a bearing surface having a plurality of pads; The pad slider of the outflow end part comprised the wedge shape of which the width | variety becomes narrow toward an outflow end among pads, The head slider characterized by the above-mentioned.

(Supplementary note 12) The head slider of Supplementary note 11, wherein the wedge-shaped length of the pad at the outflow end is longer than the maximum width of the servo zone of the magnetic disk.

(Supplementary note 13) The head slider of Supplementary note 11, wherein the vertex angle of the wedge shape of the pad at the outflow end is 90 degrees or less.

(Supplementary note 14) The head slider of Supplementary note 11, wherein the pad at the outflow end is composed of at least two layers, and the surface layer is formed in a wedge shape among the two layers.

(Supplementary Note 15) The head slider of Supplementary Note 11, wherein the pad at the outflow end has a surface layer formed in a wedge shape and a head structure layer provided below the surface layer to constitute the magnetic head.

(Supplementary Note 16) The head slider of Supplementary Note 15, wherein the head structure layer has a width for constituting the magnetic head at the outflow end and is configured in the shape of the surface layer other than the outflow end.

(Supplementary Note 17) The head slider of Supplementary Note 11, wherein the wedge shape of the pad at the outflow end has a vertex.

(Supplementary Note 18) The head slider of Supplementary Note 11, wherein the wedge shape of the pad at the outlet end has a straight portion at the outlet end.

(Supplementary Note 19) The magnetic disk includes the data zone including a plurality of tracks separated by grooves along the circumferential direction of the magnetic disk, and a servo zone provided in the radial direction of the magnetic disk and separated by grooves. The head slider of Supplementary Note 11, characterized in that consisting of.

(Supplementary Note 20) The head slider of Supplementary Note 11, wherein the head slider has a front pad provided at the inlet end and a rear pad provided at the outlet end.

Since the pad shape of the outflow end part was comprised in the wedge shape which narrows toward the outflow end among the some pads of a head slider, since pressure distribution can be improved and the pressure by a fluid can be averaged, the discrete The floating amount fluctuation caused by the groove of the media can be suppressed, so that stable floating is possible. In addition, it is possible to stably float with a small floating amount, so that high density recording / reproducing can be accurately realized.

1 is a configuration diagram of an embodiment of a magnetic disk device of the present invention.

2 is an explanatory view of a bearing surface of the head slider of FIG. 1;

3 is a cross-sectional view of the rear pad of FIG.

4 is a pressure distribution diagram of a conventional head slider.

Figure 5 is an enlarged view of the rear pad of Figure 2;

Fig. 6 is a characteristic diagram of the floating amount change of the head slider of Fig. 2;

7 is a pressure distribution diagram of the head slider of FIG.

FIG. 8 is a relation between the vertex angle and the floating variation of the rear pad of FIG. 2; FIG.

Fig. 9 is a configuration diagram of the head slider of the second embodiment of the present invention.

Fig. 10 is a configuration diagram of a modification of the head slider of the second embodiment of the present invention.

11 is a block diagram of a discrete media.

12 is an explanatory diagram of a conventional head slider.

13 is an explanatory view of a bearing surface of a conventional head slider.

14 is a characteristic diagram of the floating amount of a conventional head slider.

<Explanation of symbols for main parts of the drawings>

34: rear pad

38: wedge shape

40: magnetic head

102: magnetic disk (discrete media)

104: axis of rotation of the spindle motor

106: VCM (Rotary Actuator)

108: arm

110: rotation axis

112: Head Slider

116: suspension

Claims (10)

A magnetic disk having a data zone and a servo zone and having a groove on the surface thereof; A spindle motor for rotating the magnetic disk, An actuator for driving an arm in the radial direction of the magnetic disk, Has a head slider comprising a magnetic head provided at the tip of the arm, The head slider, The magnetic head provided on the outlet end side; Has a bearing surface with a plurality of pads, The magnetic disk device of the plurality of pads, wherein the pad shape at the outflow end is formed in a wedge shape that narrows toward the outflow end. The magnetic disk apparatus according to claim 1, wherein the wedge-shaped length of the pad at the outflow end is longer than the maximum width of the servo zone of the magnetic disk. The magnetic disk apparatus according to claim 1, wherein the vertex angle of the wedge shape of the pad at the outflow end is 90 degrees or less. The pad of claim 1, wherein the pad at the outlet end consists of at least two layers, A magnetic disk apparatus, wherein the surface layer is formed in a wedge shape among the two layers. The pad of the outflow end is formed with a surface layer formed in a wedge shape, The magnetic disk apparatus provided below the said surface layer, and has a head structure layer for constructing the said magnetic head. A head slider having a data zone and a servo zone and floating on a magnetic disk having grooves on its surface, A magnetic head provided on the outlet end side, Has a bearing surface with a plurality of pads, The pad slider of the outflow end part was comprised in the said wedge shape of width | variety toward an outflow end among the said some pad, The head slider characterized by the above-mentioned. 7. The head slider according to claim 6, wherein the wedge-shaped length of the pad at the outflow end is longer than the maximum width of the servo zone of the magnetic disk. The head slider according to claim 6, wherein the vertex angle of the wedge shape of the pad at the outflow end is 90 degrees or less. 7. The pad of claim 6, wherein the pad at the outlet end consists of at least two layers, The head slider in which two surface layers comprised the wedge shape. The pad of claim 6, wherein the pad at the outlet end is A surface layer composed of a wedge shape, The head slider provided below the said surface layer, and has a head structure layer for constructing the said magnetic head.

Images