JP2008226396A - Magnetic disk device and head slider - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress variation of floating quantity even if floating quantity is small, in a head slider floating on a discrete medium. <P>SOLUTION: The device is constituted so that a shape of a pad (34) of a flow-out end part out of a plurality of pads (30, 32, 34) of a head slider (112) is a wedge shape (38) in which width becomes narrower toward the flow-out end. Since pressure distribution can be improved and pressure by fluid can be averaged, variation of floating quantity by grooves of discrete media can be suppressed and stable floating can be performed. Also, as stable floating can be performed with small floating quantity, high density recording/reproducing can be achieved surely. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a magnetic disk apparatus and a head slider that levitates a magnetic head with respect to a rotating magnetic disk and reads / writes a track of the magnetic disk with the magnetic head, and more particularly, to levitating a magnetic disk composed of a discrete medium. The present invention relates to a magnetic disk device and a head slider for stabilizing the amount.

  In order to improve the storage density of magnetic disks in recent years, development of discrete media in which physical irregularities are formed on the surface of the magnetic disk and tracks are separated has been progressing.

  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 (Air Bearing Surface) of the conventional head slider.

  As shown in FIG. 11, the discrete track medium 10 includes a data zone 12 for recording / reproducing normal information and a servo zone 11 in which servo information used for head positioning is recorded in advance.

  In these two zones, the surface shape such as the shape of the groove processed on the surface of the medium 10 is also different due to the difference in function. On the data zone 12, a groove 12a along the circumferential direction separating 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 a groove 11a in the medium radial direction.

  The servo information includes a gray code (indicating a track number), preamble for timing control, and position information, and these are recorded in a servo information recording area 11b separated by a groove 11a. Since the servo information is 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, in the servo zone 11, a groove 11a is formed in the radial direction to cause interference of the servo information. To prevent.

  Thus, since the surface structure of the medium 10 is different between the two zones 11 and 12, the fluid resistance of the surface of the medium 10 is different between the zones 11 and 12. For this reason, the flying height of the flying head slider on which the head for recording / reproducing information is mounted also varies depending on whether it is flying over the servo zone 11 or the data zone 12.

  As shown in FIG. 12, the head slider 20 opposes the surface of the medium 10 and floats with the fluid pressure generated by the movement of the medium 10. With recent improvements in recording density, the flying height is about 10 nanometers. An electromagnetic conversion element (read / write element) 24 is provided on the side surface of the head slider 20. The left end of the head slider 20 in FIG. 12 is the fluid inflow end, and the right end is the outflow end.

  The head slider 20 not only simply raises the electromagnetic transducer 24 from the surface of the medium 10 but also controls the flying posture. For this reason, as shown in FIG. 13, a front pad 21 having a relatively large area is provided on the inflow end side, and a rear pad 23 having an area equal to the width Wh of the electromagnetic transducer 24 is provided on the outflow end side.

  Due to the difference in area between the front pad 21 and the rear pad 23, the slider 20 floats so that the outflow end side (electromagnetic conversion element 24) side from the inflow end approaches the medium 10. That is, at the most outflow end edge E, the clearance gap is the smallest. A pair of middle pads 22 provided between the front pad 21 and the rear pad 23 is provided near the upper and lower ends of the bearing surface, and controls the posture of the slider 20 in the track crossing direction.

  FIG. 12 is a cross-sectional view of the rear pad 23 of FIG. 13, and the slider pad 20 is provided with a rear pad 23 composed of a two-layer film. FIG. 12 shows the layer structure in stages.

  FIG. 14 shows an example in which the flying height is measured when the head slider 20 having a length L floats on the medium 10 having a non-uniform surface groove structure as described in FIGS. Here, the groove depth on the surface of the medium 10 is uniformly 15 nm (nanometers). FIG. 14 shows time (movement position) on the horizontal axis and the flying height on the vertical axis. As seen in FIG. 14, the flying height of the head slider 20 is about 10 nm, but is rapidly changing by about 5 nm.

  This is a phenomenon caused by a change in generated pressure due to a change in fluid resistance on the surface of the servo zone 11 when the pad 23 at the most outflow end of the head slider 20 passes over the servo zone 10. is there. When such a large change in flying height occurs, the signal level of the reproduction signal of the electromagnetic transducer 24 changes, and there is a problem that information cannot be reproduced or accurate information cannot be recorded.

  In order to prevent such a phenomenon, conventionally, it has been proposed to prevent the flying height 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, , See Patent Document 1).

In another prior art, it has been proposed to prevent a change in flying height by optimizing the ratio of the total area of the pads of the head slider 20 and the total area of the convex portions of the medium 10 immediately below the pads. (For example, refer to Patent Document 2).
JP-A-5-81808 JP 2005-50482 A

  However, in the first prior art, when the flying height may be large, it is effective to relatively reduce the fluctuation range with respect to the large flying height, but when the flying height is small, the relative height is relatively small. Therefore, it is difficult to suppress the change in flying height.

  Also, in the second prior art, as shown in FIG. 5 of Patent Document 1, when the flying height is relatively large as 20 nm, it is effective to relatively reduce the fluctuation range. When the amount is small (for example, 10 nm), the relative fluctuation width becomes large, and it is difficult to suppress the flying height change.

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

  It is another object of the present invention to provide a magnetic disk device and a head slider for suppressing a change in flying height when a discrete media passes through a servo zone and realizing accurate recording / reproduction.

  Furthermore, another object of the present invention is to provide a magnetic disk device and a head slider for realizing a high density recording / reproduction by suppressing a change in the flying height even if the flying height with respect to the discrete media is reduced. is there.

  It is another object of the present invention to provide a magnetic disk device and a head slider for suppressing flying height fluctuations and realizing an optimum flying height for increasing the density of perpendicular magnetic recording.

  In order to achieve this object, a magnetic disk apparatus according to the present invention has a data zone, a servo zone, a magnetic disk having a groove on the surface, a spindle motor that rotates the magnetic disk, and an arm attached to the magnetic disk. An actuator for driving in a radial direction, and a head slider including a magnetic head provided at the tip of the arm, the head slider being a bearing having the magnetic head provided on the outflow end side and a plurality of pads. The pad shape of the outflow end portion of the plurality of pads has a wedge shape whose width decreases toward the outflow end.

  The head slider of the present invention has a data zone and a servo zone, and is a head slider that floats on a magnetic disk having a groove on the surface. The head slider provided on the outflow end side includes a plurality of pads. The pad shape of the outflow end portion of the plurality of pads is formed in a wedge shape whose width decreases toward the outflow end.

  Furthermore, 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.

  Further, in the present invention, preferably, the apex angle of the wedge shape of the pad at the outflow end is 90 degrees or less.

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

  In the present invention, it is preferable that the pad at the outflow end has a wedge-shaped surface layer and a head component layer provided under the surface layer to constitute the magnetic head. .

  Further, in the present invention, preferably, the head constituting layer has a width for constituting the magnetic head at the most outflow end, and is formed in the shape of the surface layer except for the most outflow end. .

  Further, in the present invention, preferably, the wedge shape of the pad at the outflow end has a vertex.

  Furthermore, in the present invention, it is preferable that the wedge shape of the pad at the outflow end has a straight portion at the outflow end.

  Furthermore, in the present invention, preferably, the magnetic disk is provided in the radial direction of the magnetic disk, the data zone including a plurality of tracks separated by grooves along the circumferential direction of the magnetic disk, It consists of servo zones separated by grooves.

  In the present invention, it is preferable that the head slider includes a front pad provided at the inflow end and a rear pad provided at the outflow end.

  Out of the multiple pads of the head slider, the pad shape at the outflow end is a wedge shape that narrows toward the outflow end, so that the pressure distribution can be improved and the pressure due to the fluid can be averaged. Fluctuations in flying height due to media grooves can be suppressed, and stable flying can be achieved. In addition, since it is possible to stably fly with a small flying height, high-density recording / reproduction can be realized accurately.

  Hereinafter, embodiments of the present invention will be described in the order of the magnetic disk device, the first embodiment of the magnetic head slider, the second embodiment of the magnetic head slider, and the other embodiments. Is not limited to this embodiment.

(Magnetic disk unit)
FIG. 1 is a configuration diagram of an embodiment of a magnetic disk apparatus according to the present invention, and shows a perpendicular recording type magnetic disk apparatus as an example. As shown in FIG. 1, a magnetic disk 102, which is a perpendicular magnetic storage medium, is provided on a rotating shaft 104 of a spindle motor. The spindle motor rotates the rotating shaft 104 to rotate the magnetic disk 102. The arm 108 is rotated by a VCM (Voice Coil Motor) 106 around a rotation shaft 110. A suspension 116 is attached to the tip of the arm 108.

  A head slider 112 on which a magnetic head (read element and write element) is mounted is provided at the tip of the suspension 116. In addition, a ramp load mechanism 114 is provided that retracts the magnetic head from the magnetic disk 102 and parks the magnetic head. These mechanisms are accommodated in the apparatus housing 100.

  The magnetic disk 102 is constituted by the discrete media described with reference to FIGS. In the magnetic disk apparatus, the arm 108 is rotated in the radial direction of the magnetic disk 102 by the VCM 106 and the head slider 112 including the magnetic head is positioned on a desired track of the magnetic disk 102.

  As described with reference to FIGS. 11 and 12, tracks are concentrically formed on the magnetic disk 102 so as to be separated by grooves, and the magnetic head can rotate freely around one track by the rotation of the magnetic disk 102. Read and write data in the sector.

  The magnetic head is composed of a read element and a write (perpendicular recording) element, a read element including a magnetoresistive (MR) element is stacked on the head slider, and a write element including a write coil is stacked thereon. Composed.

(First embodiment of head slider)
2 is a view showing the bearing surface shape of the head slider according to the first embodiment of the present invention, FIG. 3 is a sectional view thereof, and FIG. 4 is an explanatory view of the rear pad of FIGS.

  As shown in FIG. 2, the head slider 112 is provided with a front pad 30 having a relatively large area on the inflow end side, and the rear pad 34 having an area equal to the width Wh of the electromagnetic transducer (magnetic head) 40 on the outflow end side. Is provided. As shown in FIG. 3, due to the difference in area between the front pad 30 and the rear pad 34, the slider 112 floats so that the outflow end side (electromagnetic conversion element 40) side is closer to the medium 102 than the inflow end. That is, at the most outflow end edge P, the clearance gap is the smallest.

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

  As shown in FIGS. 2 and 3, the rear pad 34 that is the most outflow end pad has a head constituting layer 37 and a surface layer 36 provided on the head constituting layer 37 on the slider base 31. The layer 36 is configured in a wedge shape so that its width gradually decreases toward the outflow end. The apex angle of the wedge is represented by P.

  As shown in the cross-sectional shape along the slider center line CC ′ of the most outflow end pad 34 in FIG. 3, a layer 37 constituting the head is provided with a step ds = 2 nm from the outflow end pad surface layer 36. This layer 37 also has a structure in which the width becomes narrower toward the outflow end.

  However, the head constituting layer 37 has a width Wh for constituting the head at the most outflow end portion. Thus, by forming the surface layer 36 of the most outflow end pad 34 in a wedge shape, in the conventional example of FIG. In the present embodiment, the flying clearance is minimized on the apex P of the wedge-shaped portion.

  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.

  The reason why the wedge-shaped part is formed on the rear pad 34 will be described. FIG. 4 shows the calculation result of the pressure distribution along the center line CC ′ of the conventional head slider of FIG. 13, the horizontal axis is the position (distance) y with respect to the inflow end of the slider, and the vertical axis is , Pressure.

  In FIG. 4, the thin line shows the pressure distribution when the slider 20 of FIG. 13 floats on the data zone, and the thick line shows the pressure distribution when the most outflow edge E is on the servo zone. In the figure, the servo zone range corresponds to the servo zone.

  In either case, a large pressure is generated at the most outflow end pad portion 21 of the slider 20. In addition, the gas is compressed and the pressure rises on the upstream side (the inflow end side) from the most outflow end edge E, whereas the gap increases on the downstream (outflow end) side, and the gas expands rapidly. The pressure decreases. Therefore, at the most outflow edge E, the pressure takes a peak value.

  Further, when the most outflow edge E is on the servo zone 11, a larger pressure is generated as compared with the case of being on the data zone 12. As a result, the flying height becomes large when the most outflow edge E shifts from the data zone to the servo zone. In FIG. 14, the time point t1 at which the flying height starts to change suddenly is the time point when the most outflow 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). Further, the most outflow edge E is required to have a certain width Wh in order to form the head 24, and when this width is large, the flying height change also increases.

  That is, the pad at the most outflow end portion affects the pressure at the most outflow end edge E. Therefore, the flying height change is suppressed by the shape of the pad 34 at the most outflow end.

  FIG. 5 shows how the servo zone 11 moves along the wedge-shaped portion 38 of the surface layer 36 of the most outflow end pad 34 of the head slider 112 as the disk 102 rotates. A region 39 (shaded portion in the figure) where the wedge-shaped portion 38 and the servo zone 11 overlap has a trapezoidal shape as shown in the figure.

  When the most outflow end pad 36 passes over the servo zone 11, the pressure in this portion increases. However, when the pad surface layer 36 is formed in a wedge shape 38, high-pressure gas is introduced to the side surface side of the wedge-shaped portion 38. The effect of flowing out increases, and in particular, this effect increases as the apex P of the wedge shape 38 is approached. Therefore, in the conventional example, the influence of passing through the servo zone appears intensively in the pressure of the most outflow edge E, whereas in this embodiment, the pressure distribution is improved and relaxed.

  FIG. 7 shows the calculation result of the pressure distribution along the slider center line CC ′ in the present embodiment in an enlarged manner in the vicinity of the most outflow end pad portion 34. 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. FIG. 7 shows a pressure distribution corresponding to the relative positional relationship between the servo zone and the slider. The dotted line indicates the pressure distribution when the slider 112 does not pass over the servo zone, and the black thick line indicates the case where the servo zone 11 is on the inflow end side of the wedge-shaped portion 38 of the most outflow end pad 34 (that is, the wedge). The vertex P of the shape portion 38 is not included in the servo zone 11), and the thin line corresponds to the case where the vertex P of the wedge-shaped portion 38 of the slider coincides with the center of the servo zone 11.

  Comparing FIG. 7 with the previous FIG. 4 (conventional example), in FIG. 4, the magnitude of the pressure at the outflow end portion differs greatly depending on the positional relationship between the most outflow end edge E and the servo zone 11. On the other hand, in the case of FIG. 7, it can be seen that there is no significant difference in the pressure due to the positional relationship between the servo zone 11 and the slider 112.

  Thus, by making the most outflow end pad surface 36 into the wedge shape 38, the influence of the outflow end pad 34 passing through the servo zone 11 can be reduced.

  Second, in this embodiment, the generated force at the most outflow end pad portion is adjusted. As shown in FIG. 5, when the overlapping region 39 is in a portion closer to the outflow end of the pad 38, the clearance gap is small on average, and as a result, the generated pressure is increased, but the average width of the overlapping region 39 is increased. Wr is small.

  On the other hand, when the overlapping region 39 is on the inflow end side, the gap is large and the generated pressure is small, but the width Wr of the overlapping region is large. Therefore, the force (= area (Wr × B (servo pattern width))) × pressure generated in the overlapping region 39 is large when the overlapping region 39 is on the inflow end side and when it is on the outflow end side. There is no difference, and the relative difference in generated force is small regardless of the relative positional relationship.

  In the conventional head slider of FIG. 13, the generated force changes drastically before and after the position where the servo zone 11 coincides with the outflow edge E, so that a sudden flying height change occurs accordingly. However, in the head slider of the present embodiment shown in FIG. 2, even if the servo zone 11 passes through the wedge-shaped portion 38 and reaches the vicinity of the outflow end point P, the generated force does not change greatly due to the wedge-shaped effect. Therefore, no sudden levitation fluctuation occurs.

  FIG. 6 is a flying height variation characteristic diagram of the head slider according to the present embodiment (FIG. 2) and the conventional head slider (FIG. 13), which is obtained by calculation. The thick line indicates the flying height change when the head slider of this embodiment passes the servo zone 11 on the medium 102, and the thin line indicates the flying height when the conventional head slider (FIG. 13) passes the servo pattern. Shows the amount change.

  As shown in FIG. 6, in the head slider 112 according to the present embodiment, the bearing surface shape is different, and the steady-state flying height (Hs) is about 9.2 nm, which is the conventional head slider shown in FIG. Although it is slightly different from 9.4 nm in this case, it can be seen that the change in the flying height is clearly reduced.

  Also in the present embodiment, as in the prior art, the flying height is large from the time t1 when the boundary between the servo zone 11 and the data zone 12 reaches the most outflow end point P of the wedge-shaped portion 38 of the surface layer 36 of the outflow end pad 34. Tend to be. The fluctuation range is much smaller than the conventional ΔH.

  As described above, in this embodiment, the factors causing the fluctuation in the flying height when passing through the servo zone to be small are, as described above, the improvement of the pressure distribution by the side surface and the generation force at the most outflow end pad part. This is an effect.

  As shown in FIG. 6, the flying height gradually increases from the time t2 before the time t1 when the most outflow end point P coincides with the boundary between the data zone 12 and the servo zone 11. This is because of the wedge-shaped effect, the generated force in the overlapping region 39 of the wedge-shaped portion 38 and the servo zone 11 when the servo zone 11 is closer to the inflow end side of the wedge-shaped portion 38 is relatively large. This is the result of changing the flying height.

  In the end, in the head slider shown in the present embodiment, the flying height change caused by the servo zone 11 passing through the most outflow end pad portion 36 is averaged, and the peak value of the flying fluctuation can be suppressed small. Become.

  It is clear from the above description that the shape effect of the surface layer 36 of the most outflow end pad 34 is enhanced by the length Lw of the wedge-shaped portion 38 being larger than the maximum width B of the servo zone.

  Further, in order to sufficiently exhibit this effect, it is desirable that the apex angle θ (see FIG. 2) of the wedge shape 38 is an acute angle. FIG. 8 shows the calculation result of the flying height fluctuation peak value ΔH (difference between the maximum flying height and the steady flying height in FIG. 6) with respect to the apex angle θ of the wedge shape.

  As can be seen from FIG. 8, in the head slider according to the present embodiment, the apex angle θ is set to 78 degrees, and the flying height fluctuation peak value ΔH = 1 nm is sufficiently small. It can also be seen that when the apex angle θ exceeds 90 degrees, the flying height fluctuation peak value ΔH increases rapidly. For this reason, the apex angle of the wedge-shaped portion 38 is desirably 90 degrees or less.

  Further, in this embodiment, as shown in FIG. 2, it is effective to follow the same wedge shape as the pad surface layer 36 as much as possible with respect to the layer 37 constituting the head. Actually, the step between the layer 37 constituting the head and the pad surface layer 36 is about 2 nm, and it can be more effective to make this layer 37 a shape close to a wedge shape.

(Second Embodiment of Magnetic Head Slider)
FIG. 9 and FIG. 10 are explanatory diagrams of the second embodiment of the magnetic head slider of the present invention, and show the shape of only the most outflow end pad surface layer 36. In the first embodiment shown in FIG. 2, a wedge 38 that is symmetrical with respect to the center line of the head slider 112 is shown.

  However, depending on the design conditions, even the asymmetric wedge shape 38A as shown in FIG. 9 does not impair the effect at all. Further, similarly, as shown in FIG. 10, a trapezoidal wedge 38B having a short side on the outflow end side may be used. However, in the case of FIG. 10, the effect is inevitably reduced as compared with the wedge-shaped case, but the flying height fluctuation can be greatly suppressed as compared with the conventional case.

(Other embodiments)
In the above-described embodiment, the magnetic disk device has been described as an example of a perpendicular magnetic disk device, but can be applied to other disk devices such as a horizontal magnetic recording device and an optically assisted perpendicular magnetic disk device. Further, as described above, when the rear pad has a trapezoidal shape, the rear pad may be composed of one layer. Furthermore, the discrete media is not limited to the configuration shown in FIG. 11 and can be applied to other so-called discrete media. Moreover, the present invention can be applied to a configuration in which no middle pad is provided.

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

  (Supplementary Note 1) A magnetic disk having a data zone and a servo zone and having a groove on the surface, a spindle motor for rotating the magnetic disk, an actuator for driving an arm in a radial direction of the magnetic disk, A head slider including a magnetic head provided at the tip, the head slider having the magnetic head provided on the outflow end side and a bearing surface having a plurality of pads, The magnetic disk device is characterized in that the pad shape of the outflow end portion is formed in a wedge shape whose width becomes narrower toward the outflow end.

  (Supplementary note 2) The magnetic disk device according to supplementary note 1, wherein the length of the wedge shape 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 according to supplementary note 1, wherein the apex angle of the wedge shape of the pad at the outflow end is 90 degrees or less.

  (Supplementary note 4) The magnetic disk apparatus according to supplementary note 1, wherein the pad at the outflow end is composed of at least two layers, and the surface layer of the two layers is constructed in a wedge shape.

  (Supplementary Note 5) The pad at the outflow end portion includes a surface layer configured in a wedge shape and a head configuration layer provided under the surface layer to configure the magnetic head. The magnetic disk device according to appendix 1.

  (Additional remark 6) The said head structure layer has the width | variety for comprising the said magnetic head at the said most outflow end, and comprised the shape of the said surface layer except the said most outflow end, It is characterized by the above-mentioned. The magnetic disk device according to appendix 5.

  (Supplementary note 7) The magnetic disk drive according to supplementary note 1, wherein the wedge shape of the pad at the outflow end has a vertex.

  (Supplementary note 8) The magnetic disk apparatus according to supplementary note 1, wherein the wedge shape of the pad at the outflow end has a straight line portion at the outflow end.

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

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

  (Additional remark 11) In the head slider which floats on the magnetic disk which has a data zone and a servo zone and has a groove | channel on the surface, the said magnetic head provided in the outflow end side, and the bearing surface which has several pads A head slider comprising a plurality of pads, wherein a pad shape of an outflow end portion is formed in a wedge shape whose width becomes narrower toward the outflow end.

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

  (Additional remark 13) The head slider of Additional remark 11 characterized by the wedge-shaped apex angle of the pad of the said outflow end part being 90 degrees or less.

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

  (Supplementary Note 15) The outflow end pad has a wedge-shaped surface layer and a head component layer provided under the surface layer to constitute the magnetic head. The head slider according to appendix 11.

  (Supplementary Note 16) The head constituting layer has a width for constituting the magnetic head at the most outflow end, and is formed in the shape of the surface layer except for the outflow end. The head slider according to appendix 15.

  (Additional remark 17) The wedge shape of the pad of the said outflow end part has a vertex, The head slider of Additional remark 11 characterized by the above-mentioned.

  (Supplementary note 18) The head slider according to supplementary note 11, wherein the wedge shape of the pad at the outflow end has a linear portion at the outflow end.

  (Supplementary note 19) The magnetic disk is provided in the radial direction of the magnetic disk, the data zone including a plurality of tracks separated by grooves along the circumferential direction of the magnetic disk, and separated by the grooves. The head slider according to appendix 11, characterized by comprising a servo zone.

  (Supplementary note 20) The head slider according to supplementary note 11, wherein the head slider has a front pad provided at the inflow end and a rear pad provided at the outflow end.

  Out of the multiple pads of the head slider, the pad shape at the outflow end is a wedge shape that narrows toward the outflow end, so that the pressure distribution can be improved and the pressure due to the fluid can be averaged. Fluctuations in flying height due to media grooves can be suppressed, and stable flying can be achieved. In addition, since it is possible to stably fly with a small flying height, high-density recording / reproduction can be realized accurately.

1 is a configuration diagram of an embodiment of a magnetic disk device of the present invention. FIG. It is explanatory drawing of the bearing surface of the head slider of FIG. FIG. 3 is a cross-sectional view of the rear pad of FIG. 2. It is a pressure distribution figure of the conventional head slider. FIG. 3 is an enlarged view of the rear pad of FIG. 2. FIG. 3 is a characteristic diagram of a change in flying height of the head slider in FIG. 2. FIG. 3 is a pressure distribution diagram of the head slider of FIG. 2. FIG. 3 is a relationship diagram between the apex angle of the rear pad of FIG. It is a block diagram of the head slider of the 2nd Embodiment of this invention. It is a block diagram of the modification of the head slider of the 2nd Embodiment of this invention. It is a block diagram of discrete media. It is explanatory drawing of the conventional head slider. It is explanatory drawing of the bearing surface of the conventional head slider, It is a characteristic diagram of the flying height of a conventional head slider.

Explanation of symbols

102 Magnetic disk (discrete media)
104 Spindle motor rotation shaft 106 VCM (rotary actuator)
110 Rotating shaft 108 Arm 116 Suspension 112 Head slider 34 Rear pad 38 Wedge shaped portion 40 Magnetic head

Claims (10)

A magnetic disk having a data zone and a servo zone and having grooves on the surface;
A spindle motor for rotating the magnetic disk;
An actuator for driving an arm in a radial direction of the magnetic disk;
A head slider including a magnetic head provided at the tip of the arm;
The head slider is
The magnetic head provided on the outflow end side;
A bearing surface having a plurality of pads;
Of the plurality of pads, the pad shape at the outflow end portion is formed in a wedge shape whose width becomes narrower toward the outflow end. The magnetic disk device 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 apex angle of the wedge shape of the pad at the outflow end is 90 degrees or less. The outflow end pad is composed of at least two layers,
The magnetic disk apparatus according to claim 1, wherein the surface layer of the two layers is formed in a wedge shape. The pad at the outflow end is
A surface layer composed of a wedge shape;
The magnetic disk apparatus according to claim 1, further comprising: a head constituting layer provided under the surface layer and constituting the magnetic head. In a head slider that floats on a magnetic disk having a data zone and a servo zone and having grooves on the surface,
The magnetic head provided on the outflow end side;
A bearing surface having a plurality of pads,
Among the plurality of pads, the pad shape at the outflow end portion is formed in a wedge shape whose width becomes narrower toward the outflow end. 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 a servo zone of the magnetic disk. The head slider according to claim 6, wherein the apex angle of the wedge shape of the pad at the outflow end is 90 degrees or less. The outflow end pad is composed of at least two layers,
The head slider according to claim 6, wherein, of the two layers, the surface layer is formed in a wedge shape. The pad at the outflow end is
A surface layer composed of a wedge shape;
The head slider according to claim 6, further comprising: a head constituent layer provided under the surface layer and constituting the magnetic head.

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