JPH09231540A - Head slider and magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the fluctuation of static floating amt. over the whole surface of a magnetic disk and also to reduce a static roll by generating a negative pressure enough to offset the increase of positive pressure due to the increase of linear velocity. SOLUTION: In this head slider 16, a positive pressure generating part 161 is formed on its surface opposite to the magnetic disk, and in the generating part 161, a 1st negative pressure generating part 163 and a 2nd negative pressure generating part 164 are formed to narrow the area of the generating part 161 from the vicinity of the middle of the generating part 163 toward an air outflow end of the generating part 163. When the slider 16 approaches the rotating magnetic disk, the positive pressure is generated on the generating part 161, and the negative pressure the generating parts 163 and 164 respectively. The slider 16 is given floating force by a difference between these positive and negative pressures. Then, even when the linear velocity of the slider 16 is changed by varying the position of the slider 16 in the radial direction of the magnetic disk, the positive pressure and the negative pressure are both varied in the same direction in response to a variation in this linear velocity, so that the rise of the floating force due to the increase of the linear velocity is suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flying head slider equipped with a magnetic head for recording and reproducing information such as data and programs from a magnetic disk, and a magnetic disk drive provided with the head slider.

[0002]

2. Description of the Related Art For example, in a computer system, a hard disk device is used as a magnetic disk device. Magnetic films are formed on both surfaces of the magnetic disk built in the hard disk device, and data and the like are tracked on the magnetic film by a magnetic head mounted on a head slider floating above the surface of the magnetic disk. The data and the like recorded on the magnetic film in a track shape are reproduced. The mechanism for driving the flying head slider on which the magnetic head is mounted and the drive for driving the magnetic disk are pre-installed inside the housing, so that data and the like are recorded at a relatively high density. It is also possible to access recorded data and the like at high speed.

FIG. 15 is a perspective view showing a configuration example of a hard disk device which is an example of a conventional magnetic disk device. In the hard disk drive 1, a spindle motor 9 is disposed on the back side of a plane portion of a housing 2 formed of an aluminum alloy or the like, and a magnetic disk 3 rotated at a constant angular velocity by the spindle motor 9 is provided.
Is provided. Further, the housing 2 includes an arm 4
Is swingably mounted around the vertical axis 4a.
A voice coil 5 is attached to one end of the arm 4, and a head slider 6 is attached to the other end of the arm 4. Magnets 7a and 7b are mounted on the housing 2 so as to sandwich the voice coil 5. A voice coil motor 7 is formed by the voice coil 5 and the magnets 7a and 7b.

In such a configuration, the voice coil 5
When an electric current is supplied from the outside to the arm 4, the arm 4 rotates around the vertical axis 4a based on the force generated by the magnetic fields of the magnets 7a and 7b and the electric current flowing through the voice coil 5. As a result, the head slider 6 attached to the other end of the arm 4 pivots substantially in the radial direction of the magnetic disk 3, as indicated by the arrow X in FIG. Here, as shown in FIG. 17, the head slider 6 has rails 6a and 6b acting as air bearing surfaces formed on both sides of the lower surface of the head slider 6 in the turning direction (hereinafter referred to as the width direction) with respect to the magnetic disk 3. At the same time, the taper portion 6 is provided on the leading end side of the rails 6a and 6b in the traveling direction (hereinafter referred to as the length direction) with respect to the magnetic disk 3.
c and 6d are formed.

As a result, when the head slider 6 approaches the surface of the rotating magnetic disk 3, the rails 6a and 6b and the magnetic disk 3 are rotated along with the rotation of the magnetic disk 3, as shown by the arrow Y in FIG. Levitating force is applied by the air flow flowing into and out of the surface. This levitation force causes the head slider 6 to seek the magnetic disk 3 while levitating from the surface of the magnetic disk 3 with a minute distance (flying amount) d, as shown in FIG. The magnetic head 8 that has been removed is the magnetic disk 3
Recording and reproduction of data and the like are performed in a non-contact manner with respect to a predetermined track and the like. The flying height d is generally 0.1 μm.
m.

If the head slider 6 having such a structure is not used, when a shock is applied to the magnetic disk 3 or when the surface of the magnetic disk 3 is uneven or wavy,
When the head slider cannot follow sufficiently, fluctuation of the flying height d of the head slider, so-called dynamic fluctuation of flying height occurs. However, according to the above-mentioned head slider 6, the flying height d of the head slider 6 on the same track is increased.
Is maintained substantially constant, so that the spacing loss can be reduced and the wear and damage of the magnetic disk 3 due to the magnetic head 8 directly contacting the surface of the magnetic disk 3 can be prevented.

[0007]

As described above, the conventional head slider 6 floats by utilizing the dynamic pressure generated by the rotation of the magnetic disk 3. The magnitude of this dynamic pressure increases as the linear velocity increases. Here, when the magnetic disk 3 rotates at a constant angular velocity, the linear velocity on the outer periphery is higher than the linear velocity on the inner periphery. Therefore, when the head slider 6 is arranged so as to be always parallel to the circumferential direction of the magnetic disk 3, the flying height d of the head slider 6 is determined when the head slider 6 is located on the inner circumference of the magnetic disk 3. It goes up when it is located on the outer circumference.

However, since the arm 4 is of the rotary type as described above, the flying height d of the head slider 6 when the head slider 6 is located outside the magnetic disk 3 is more than when the head slider 6 is located inside the magnetic disk 3. It doesn't always rise. This is because when the arm 4 rotates around the vertical axis 4a, the head slider 6 moves not on a straight line but on a circular arc in the radial direction of the magnetic disk 3. Then, as shown in FIG. 19, the head slider 6 has a center line 6 of its width.
The deviation e from the tangential direction 3a of the track of the magnetic disk 3 causes a so-called skew angle θs. The skew angle θs changes depending on the position from the center of the magnetic disk 3. When the skew angle θs increases, the conversion efficiency of the dynamic pressure between the head slider 6 and the surface of the magnetic disk 3 into the levitation force decreases, and the flying height d of the head slider 6 decreases. That is, the flying height d of the head slider 6 that should rise on the outer peripheral side of the magnetic disk 3 is the skew angle θ.
It will be lowered by s.

The above-described characteristic that the flying height d of the head slider 6 rises with an increase in the linear velocity, that is, the linear velocity dependence is linear, but the flying height of the head slider 6 increases with an increase in the skew angle θs. The characteristic of decreasing d, so-called skew dependency, is a second-order non-linearity. Therefore, as long as the conventional head slider 6 is used, it is difficult to balance the linear velocity dependence and the skew dependence over the entire radial range of the magnetic disk 3 to suppress so-called static flying height fluctuation. Is. Therefore, the static flying height variation due to the interaction between the linear velocity dependence and the skew dependence makes it impossible to keep the S / N constant at the time of recording / reproducing, and therefore, the magnetic head 8 for a desired track. However, there is a problem in that it is impossible to accurately record and reproduce information.

The flying posture of the head slider 6 is such that the taper portions 6c and 6d are lifted by the air flow in the lengthwise direction of the head slider 6 as shown in FIG. 20B, either of the rails 6a and 6b is lifted depending on the skew angle and the linear velocity difference between the rails 6a and 6b of the head slider 6, as shown in FIG. Such a change in the flying attitude of the head slider 6 in the length direction is called a pitch, and a change in the flying attitude of the head slider 6 in the width direction is called a roll (see FIG. 21). Of these, the roll becomes larger due to external force such as seek, so
There is a high possibility that the magnetic head 3 will be worn and damaged by the direct contact of the magnetic head 8 with the surface of the magnetic disk 3.

Here, the sticking of the head slider 6 is prevented, the floating characteristic is improved, and the CSS (Contact)
In order to improve the Start Stop characteristic, the width direction and the length direction of the surfaces of the rails 6a and 6b of the head slider 6 have a curved shape called a crown as shown in the schematic view of the head slider 6 in FIG. ing. In particular, the widthwise crown affects the static roll. FIG.
FIG. 6 is a diagram showing a relationship between a roll angle and a crown amount (crown height) in the width direction. The amount of crown in the width direction is 0 nm
It rolls to the rail 6b side of the head slider 6 up to about 6 nm, but conversely rolls to the rail 6a side of the head slider 6 when the crown amount in the width direction exceeds about 6 nm. Therefore, the static roll is eliminated, that is, the roll angle is 0.
In order to adjust the degree, the crown amount in the width direction may be set to about 6 nm. However, in reality, the crown amount is specified for optimizing CSS characteristics and easiness of processing. In most cases, it cannot be adjusted.

In view of the above points, the present invention is provided with a head slider capable of suppressing the static fluctuation of the flying height over the entire surface of the magnetic disk and reducing the static roll, and a head slider thereof. Another object of the present invention is to provide a magnetic disk device.

[0013]

SUMMARY OF THE INVENTION According to the present invention, the above object is to provide a head slider equipped with a magnetic head that floats on a magnetic disk by an air flow and records and reproduces information from the magnetic disk. And a positive pressure generating portion that is formed on a surface that faces the magnetic disk and that introduces a positive flow and that generates a positive pressure by the air flow that is introduced from the air flow introducing portion, and that faces the magnetic disk. The surface is formed from the air inflow end of the positive pressure generating portion to the vicinity of the center of the positive pressure generating portion, and the air inflow end side of the positive pressure generating portion is closed by the air flow introducing portion, and the air flow introducing portion is formed. A first negative pressure generating portion for generating a negative pressure by an air flow introduced from a portion, and a surface facing the magnetic disk, which is continuous with the air outflow end of the first negative pressure generating portion. Positive pressure generation part The air outlet end is formed, the air outlet end side of the positive pressure generating portion is opened, and the positive pressure is increased from the vicinity of the center of the first negative pressure generating portion toward the air outlet end of the first negative pressure generating portion. This is achieved by including a second negative pressure generating unit that is formed so that the area of the pressure generating unit is narrowed and that generates a negative pressure by the air flow introduced from the air flow introducing unit.

According to the above construction, the first and second negative pressure generating portions generate a negative pressure sufficient to offset the increase in the positive pressure due to the increase in the linear velocity, so that the linear velocity dependence is stabilized. Can be
Further, since the positive pressure generating unit generates a positive pressure sufficient to prevent the conversion efficiency of the dynamic pressure from being converted into the levitation force due to the increase of the skew angle, the skew dependency can be stabilized. Therefore,
It is possible to suppress static fluctuations in the flying height. Furthermore, since the second negative pressure generating unit moves the peak point of the positive pressure,
Static rolls can be reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The embodiments described below are preferred specific examples of the present invention, and therefore, various technically preferable limitations are added. However, the scope of the present invention is not limited to the following description. It is not limited to these forms unless otherwise stated.

FIG. 1 is a perspective view showing a configuration example of a hard disk drive which is an embodiment of the magnetic disk drive of the present invention. The hard disk drive 11 has a spindle motor 19 disposed behind a plane portion of a housing 12 formed of an aluminum alloy or the like, and a magnetic disk 13 that is driven to rotate at a constant angular velocity by the spindle motor 19. Have been. Furthermore, this housing 1
An arm 14 is attached to the unit 2 so as to be swingable around a vertical axis 14a. A voice coil 15 is attached to one end of the arm 14, and a head slider 16 is attached to the other end of the arm 14. Magnets 17a and 17b are mounted on the housing 12 so as to sandwich the voice coil 15. A voice coil motor 17 is formed by the voice coil 15 and the magnets 17a and 17b.

In such a configuration, the voice coil 1
When a current is supplied from the outside to the arm 5, the arm 14 causes the magnetic fields of the magnets 17 a and 17 b and the voice coil
The vertical axis 1 based on the force generated by the
Rotate around 4a. Accordingly, the head slider 16 attached to the other end of the arm 14 turns substantially in the radial direction of the magnetic recording disk 13. Therefore, the magnetic head 18 mounted on the head slider 16 performs a seek operation with respect to the magnetic disk 13 to record and reproduce data and the like on a predetermined track of the magnetic disk 13.

FIG. 2 is a perspective view showing an embodiment of the head slider of the present invention. This head slider 16 is
The whole is formed as a flat rectangular parallelepiped, and a positive pressure generating portion 161 is formed on the surface facing the magnetic disk 13,
An air flow introducing portion 16 is provided on the air inflow end side of the positive pressure generating portion 161.
2 is formed, and in the positive pressure generation part 161, a first negative pressure generation part 163 and a second negative pressure generation part 164 are formed. The head slider 16 may have another shape, for example, a cubic shape.

The positive pressure generating portion 161 is flat and is formed in a symmetrical shape with the center line of the width of the head slider 16 as an axis of symmetry. The positive pressure generating portion 161 acts as an air bearing surface, and the positive pressure generating portion 161. The levitation force of the head slider 16 is generated by the dynamic pressure (positive pressure) of the air flow flowing between the magnetic disk 13 and the magnetic disk 13. The air flow introducing section 162 is
The positive pressure generating portion 1 is continuously formed in the width direction of the head slider 16.
It is formed so as to be inclined at a predetermined angle with respect to 61, for example, an angle of 0.85 degrees. In addition, this air flow introducing section 16
2 may be formed in a step shape.

The first negative pressure generating section 163 is in a range narrower than the width of the head slider 16, and the air flow introducing section 16 is provided.
2 from the edge on the air outflow end side to the vicinity of the center of the head slider 16 in the longitudinal direction, in other words, the positive pressure generating portion 161.
Is formed with a constant depth in the range from the edge of the air inflow end to the vicinity of the center of the positive pressure generating portion 161. The shape of the first negative pressure generating portion 163 is substantially rectangular with the center line of the width of the head slider 16 as the axis of symmetry. The air inflow end side of the first negative pressure generating part 163 is closed by the air flow introducing part 162, and the air outflow end side of the first negative pressure generating part 163 is connected to the second negative pressure generating part 164. Is open.
Since the depth of the second negative pressure generating portion 164 is constant, the second negative pressure generating portion 164 is easily formed by, for example, etching.

The second negative pressure generating portion 164 is in a range wider than the width of the first negative pressure generating portion 163, and from the vicinity of the longitudinal center of the head slider 16 to the air outflow end side of the positive pressure generating portion 161. To the edge of the first negative pressure generating portion 163.
It is formed with a constant depth continuously from the air outflow end. The shape of the second negative pressure generating portion 164 is a polygonal shape with the centerline of the width of the head slider 16 as the axis of symmetry, that is, a symmetrical shape with the upper base (short side) of the trapezoid as the axis of symmetry. Since it has such a polygonal shape, the area of the positive pressure generating portion 161 becomes smaller from the vicinity of the center of the first negative pressure generating portion 163 toward the air outflow end of the first negative pressure generating portion 163. That is, the distance from the center line of the width of the head slider 16 to the end that defines the first negative pressure generating portion 163 is shorter than the distance to the end that defines the second negative pressure generating portion 164. . The area where the area of the positive pressure generating portion 161 in the second negative pressure generating portion 164 is narrower extends from the end that defines the first negative pressure generating portion 163 to the end that defines the second negative pressure generating portion 164. In between, an inclined portion corresponding to the air flow, that is, an anchor shoulder shape is formed when viewed from the air outflow end side of the positive pressure generating portion 161.

The air inflow end side of the second negative pressure generating part 164 is closed by the positive pressure generating part 161 except the part which is continuous with the air outflow end of the first negative pressure generating part 163. The air outflow end side of the second negative pressure generating portion 164 is open. Since the depth of the second negative pressure generating portion 164 is the same as the depth of the first negative pressure generating portion 163, when forming the first negative pressure generating portion 163, the first negative pressure generating portion 163 is formed. Together with this, it is easily formed by etching or the like.
The position of the first negative pressure generating portion 163 on the air inflow end side is
Generally, it is desirable that the position is about 1/2 of the length of the head slider 16, but the optimum position moves due to the linear velocity dependency and the skew dependency of the head slider 16, and the amount of movement of the head slider 16 varies. Varies depending on drive conditions and levitation characteristics. As described above, the positive pressure generating portion 161 is divided into two equal parts in the width direction of the head slider 16 by the first negative pressure generating portion 163 and the second negative pressure generating portion 164.

The head slider 16 having such a structure is
When approaching the surface of the rotating magnetic disk 13, an airflow flows between the positive pressure generating section 161 and the surface of the magnetic disk 13 as the magnetic disk 13 rotates, so that the positive pressure generating section 161 Positive pressure is generated. In addition, as the magnetic disk 13 rotates, the first negative pressure generating section 1 moves from the narrow space between the positive pressure generating section 161 and the surface of the magnetic disk 13.
63 and the second negative pressure generating portion 164 and the surface of the magnetic disk 13, the air flow flows into a relatively wide space, so that the first negative pressure generating portion 163 and the second negative pressure generating portion 16 are provided.
Negative pressure is generated at 4. Due to the difference between the positive pressure and the negative pressure, the head slider 16 receives the levitation force,
The head slider 16 and the magnetic head 18 attached to the air outflow end of the head slider 16 are designed to fly above the surface of the magnetic disk 13 with a minute distance (flying height).

In this case, since the positive pressure generating portion 161 spreads largely in the width direction of the head slider 16 on the air inflow end side, the levitation force received by the air flow is relatively large, so that the magnetic disk 13 and Even if the relative speed between the two is low, or even when negative pressure is generated in the first negative pressure generating unit 163 and the second negative pressure generating unit 164, sufficient levitation force is obtained. be able to. Then, even if the position of the head slider 16 in the radial direction of the magnetic disk 13 changes and the linear velocity of the head slider 16 with respect to the magnetic disc 13 changes, the positive pressure and the negative pressure corresponding to the change in the linear velocity. Both fluctuate in the same direction. Therefore, the rise of the levitation force due to the increase of the linear velocity is suppressed, and the fluctuation of the flying height of the head slider 16 can be reduced.

Further, even if the skew angle θs of the head slider 16 with respect to the tangential direction of the track of the magnetic disk 13 varies, an air flow is generated in the direction shown by the arrow in FIG. Pressure is generated.
Therefore, the reduction of the levitation force due to the increase of the skew angle θs is suppressed, and the fluctuation of the flying height of the head slider 16 can be reduced. From the above, it is possible to balance the linear velocity dependence and the skew dependence over the entire range of the magnetic disk 3 in the radial direction, and to suppress the static fluctuation of the flying height.

Here, the skew angle θ with respect to the head slider of the embodiment of the present invention and the conventional head slider.
The influence of s was investigated. FIG. 4A is a plan view showing an example of a taper flat slider which is a conventional head slider, and FIG. 4B is a side view thereof. This head slider 6 is similar to that shown in FIG. 17, and has a total length of 2.05 mm, a thickness of 0.43 mm, and a rail width of 0.1.
68 mm, the taper length is 0.2 mm, and the taper angle is 0.5 degrees. FIG. 5A is a plan view showing an example of a negative pressure slider which is a conventional head slider, and FIG. 5B is a side view thereof. This head slider 6'has a rectangular recess 61 for generating a negative pressure and has a total length of 2.05 mm, a thickness of 0.43 mm, and a rail width of 0.
2mm, taper length 0.2mm, taper angle 0.5 degree,
The length of the recess 61 is 1.025 mm, and the depth of the recess 61 is 0.006 mm.

FIG. 6A is a plan view showing an embodiment of the head slider of the present invention, and FIG. 6B is a side view thereof. The head slider 16 is similar to that shown in FIG. 2, and has a total length of 2.05 mm, a thickness of 0.43 mm,
The air outflow end width of the positive pressure generating portion 161 is 0.2 mm, the length of the air flow introducing portion 162 is 0.2 mm, and the air flow introducing portion 162.
Has an inclination angle of 0.5 degrees, the first negative pressure generating portion 163 has a length of 1.075 mm, and the first negative pressure generating portion 163 has a width of 0.1.
mm, the maximum length of the second negative pressure generating portion 164 is 1.275.
mm, the first negative pressure generating unit 163 and the second negative pressure generating unit 1
The depth of 64 is 0.006 mm.

Each of the head sliders 6, 6 ', 16 formed in this way has a distance of 57.6 mm between the vertical axis 14a of the arm 14 and the rotation axis of the magnetic disk 13 and an arm length of 5.
2.1 mm, arm 14 bent angle 0.0 degrees, usage radius 21.6 mm to 45.4 mm, usage skew angle θs−
The flying height was calculated by computer simulation when it was mounted on a virtual hard disk device with a rotation speed of 7,200 rpm from 6.51 degrees to 16.8 degrees and a load of 3 g was applied.

FIG. 7 shows the magnetic disk 1 at the air outflow end of each head slider 6, 6 ', 16 when the skew angle θs is changed with the linear velocity being constant (12 m / s).
3 is a diagram showing the relationship between the flying heights of the inner circumference side (-I is added) and the outer circumference side (-O is added) of FIG. The taper flat slider 6 which is the conventional head slider has the largest fluctuation of the flying height with respect to the skew angle θs, and the flying height becomes smaller as the skew angle θs becomes larger. Further, in the negative pressure slider 6 ′ which is the conventional head slider, although the fluctuation of the flying height with respect to the skew angle θs is small, the roll becomes larger as the skew angle θs becomes larger. On the other hand, in the head slider 16 of the embodiment of the present invention, the fluctuation of the flying height and the roll with respect to the skew angle are reduced.

The reason for this is that, in the case of an air flow having no skew angle θs, the maximum levitation force is the arrow a, b, c, d in FIG.
As shown by, the width is symmetrical with respect to the center line of the head slider 16, and the moments from the center line are balanced, so that no roll occurs. However, the skew angle θ
In the case of an air flow with s, the maximum levitation force moves to the downstream side under the influence of the air flow as shown by arrows A, B, C, and D in FIG. Asymmetrically, and the moment from the center line becomes unbalanced because the left side in the figure becomes large and causes a roll. Therefore, by forming the inclined portion of the second negative pressure generating portion 164, since the inclined portion follows the air flow, the levitation force C shown in FIG. 9 can be greatly increased. Therefore, even in the case of the air flow having the skew angle θs, the moments from the center line of the head slider 16 in the width direction are balanced and no roll occurs.

In FIG. 10, the skew angle θs is constant (0 degree).
FIG. 6 is a diagram showing the relationship of the flying height at the air outflow end of each head slider 6, 6 ′, 16 when the linear velocity is changed as. The taper flat slider 6 which is a conventional head slider has the largest fluctuation of the flying height with respect to the linear velocity, and the flying height increases as the linear velocity increases. On the other hand, the negative pressure slider 6'which is a conventional head slider and the head slider 16 of the embodiment of the present invention are
The fluctuation of the flying height with respect to the linear velocity is small, and in particular, the flying height of the head slider 16 of the embodiment of the present invention with respect to the linear velocity is constant.

Further, each head slider 6, 6 ', 16
Was calculated by computer simulation of the flying height when it was mounted on an actual hard disk device. FIG.
Is the flying height on the outer peripheral side of the magnetic disk 13 at the air outflow end of each head slider 6, 6 ′, 16 when the position of each head slider 6, 6 ′, 16 in the radial direction of the magnetic disk 3 is changed. It is a figure which shows the relationship of. The flying variation of each head slider 6, 6 ', 16 is 0.05
It becomes 10 micrometers, 0.0383 micrometers, and 0.0217 micrometers. From the above, by using the negative pressure, the static fluctuation of the flying height with respect to the skew angle θs and the linear velocity can be greatly improved, and further, the second negative pressure generating unit as in the embodiment of the present invention. By forming 164 ramps, static rolls can be improved. Therefore, it is possible to suppress spacing loss during recording and reproduction, improve linear recording density, and increase recording capacity.

The roll changes depending on the amount of crown in the width direction provided on the head slider 16 to optimize the inclination angle θ of the inclined portion of the second negative pressure generating portion 164 formed on the head slider 16. You can cancel by doing. Therefore, the second negative pressure generating portion 164 formed in the head slider 16 of the embodiment of the present invention.
The roll angle is 0 when the inclination angle θ of the inclined part of is changed.
The amount of crown in the width direction is calculated by computer simulation.

FIG. 12 is a diagram showing the relationship between the amount of crown in the width direction shown in FIG. 13 and the inclination angle θ of the inclined portion of the second negative pressure generating portion 164 shown in FIG. The inclination angle θ of the inclined portion of the second negative pressure generating portion 164 is 0 ° when the position where the first negative pressure generating portion 163 is pulled out in the width direction of the head slider 16 from the air outflow end. The angle of the inclined portion of the second negative pressure generating portion 164 with respect to the hypotenuse direction is −θ, and the opposite direction is + θ. As is clear from the figure, the crown amount is 0 nm to 1
In order to set the roll angle to 0 degrees in the range of 5 nm, the angle of the inclination angle θ of the inclination portion of the second negative pressure generating portion 164 is 0 degrees to −5.
It may be formed at 6.4 degrees.

In the above embodiment of the head slider, FIG. 2 shows specific shapes of the positive pressure generating portion, the air flow introducing portion, and the first and second negative pressure generating portions. However, it is sufficient that the air-lubricated surface that produces a positive pressure is provided with a concave portion that produces a negative pressure.
The length, width, arrangement, inclination angle, etc., should be optimized corresponding to the magnetic disk device actually mounted. Therefore, it is not limited to the shape, arrangement and the like shown in the above-mentioned embodiment.

[0036]

As described above, according to the present invention,
Since static fluctuations in the flying height can be suppressed over the entire surface of the magnetic disk, information can be stably recorded / reproduced by the magnetic head, and the number of rolls can be reduced. It is possible to prevent abrasion damage of the magnetic disk due to direct contact with the surface.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration example of a hard disk drive which is an embodiment of a magnetic disk drive of the present invention.

FIG. 2 is a perspective view showing an embodiment of a head slider of the present invention.

3 is a plan view showing an air flow having a skew angle with respect to the head slider shown in FIG.

FIG. 4 is a plan view and a side view showing an example of a taper flat slider which is a conventional head slider.

5A and 5B are a plan view and a side view showing an example of a negative pressure slider which is a conventional head slider.

6A and 6B are a plan view and a side view showing an embodiment of a head slider of the present invention.

FIG. 7 is a diagram showing the relationship between the flying heights of the inner circumference side and the outer circumference side of the magnetic disk at the air outflow end of each head slider shown in FIGS. 4 to 6 when the linear velocity is constant and the skew angle is changed. .

FIG. 8 is a first perspective view showing a levitation force in the embodiment of the head slider of the present invention.

FIG. 9 is a second perspective view showing the levitation force in the embodiment of the head slider of the present invention.

FIG. 10 is a diagram showing the relationship between the flying heights at the air outflow ends of the head sliders shown in FIGS. 4 to 6 when the linear velocity is changed while keeping the skew angle constant.

FIG. 11 is a diagram showing a case where the position of each head slider shown in FIGS. 4 to 6 in the radial direction of the magnetic disk is changed,
FIG. 6 is a diagram showing a relationship between flying heights on the outer peripheral side of the magnetic disk at the air outflow end of each head slider.

FIG. 12 is a diagram showing the relationship between the crown amount in the width direction and the inclination angle of the inclined portion of the second negative pressure generating portion of the embodiment of the head slider of the present invention.

FIG. 13 is a perspective view showing the crown amount in the width direction of the embodiment of the head slider of the present invention.

FIG. 14 is a second embodiment of the head slider of the present invention.
FIG. 6 is a diagram showing an inclination angle of an inclined portion of the negative pressure generating portion.

FIG. 15 is a perspective view showing a configuration example of a hard disk device which is an example of a conventional magnetic disk device.

16 is a perspective view showing an operation example of a head slider of the hard disk device shown in FIG.

17 is a perspective view showing a detailed example of a head slider of the hard disk device shown in FIG.

18 is a side view showing an operation example of the head slider of the hard disk device shown in FIG.

19 is a plan view showing an operation example of the head slider of the hard disk device shown in FIG.

20 is a side view showing the flying posture of the head slider of the hard disk device shown in FIG.

21 is a perspective view showing the roll and pitch directions of the head slider of the hard disk device shown in FIG.

22 is a schematic diagram of a head slider of the hard disk device shown in FIG.

23 is a diagram showing the relationship between the roll angle of the head slider of the hard disk device shown in FIG. 15 and the crown amount (crown height) in the width direction.

[Explanation of symbols]

1, 11 ... Hard disk device, 2, 12 ... Casing, 3, 13 ... Magnetic disk, 4, 14 ... Arm, 4a, 14a ... Vertical axis, 5, 15 ... Voice coil, 6, 16 ... Head slider, 6a ... Rail, 6b ... Rail, 6c ... Tapered portion, 6d.
..Tapered parts, 7, 17 ... Voice coil motors, 7
a, 17a ... Magnet, 7b, 17b ... Magnet, 8, 18 ... Magnetic head, 9, 19 ... Motor, 161, ... Positive pressure generating section, 162 ... Air flow introducing section , 163 ... First negative pressure generating section, 164 ... Second negative pressure generating section

Claims (9)

[Claims] 1. A head slider equipped with a magnetic head that floats on a magnetic disk by an air flow and records and reproduces information from the magnetic disk, comprising: an air flow introducing section for introducing the air flow; A positive pressure generating portion formed on opposite surfaces and generating a positive pressure by an airflow introduced from the airflow introducing portion; and a surface facing the magnetic disk, the air inflow end of the positive pressure generating portion To near the center of the positive pressure generating part, the air inflow end side of the positive pressure generating part is closed by the air flow introducing part, and a negative pressure is generated by the air flow introduced from the air flow introducing part. No. 1 negative pressure generating part and a surface facing the magnetic disk, which is formed continuously with the air outflow end of the first negative pressure generating part to the air outflow end of the positive pressure generating part. Empty of pressure generating part The outflow end side is opened, and the area of the positive pressure generating portion is formed to become narrower from the vicinity of the center of the first negative pressure generating portion toward the air outflow end of the first negative pressure generating portion. A head slider, comprising: a second negative pressure generating unit that generates a negative pressure by an air flow introduced from an air flow introducing unit. 2. The head slider according to claim 1, wherein the air flow introducing portion is inclined with respect to the positive pressure generating portion. 3. The head slider according to claim 1, wherein the positive pressure generating portion has a symmetrical shape with a center line along a direction from the air inflow end toward the air outflow end as an axis of symmetry. 4. The first negative pressure generating section has a rectangular shape whose symmetry axis is a center line along a direction from the air inflow end to the air outflow end of the positive pressure generating section. Head slider. 5. The second negative pressure generating section has a polygonal shape whose axis of symmetry is a center line along a direction from the air inflow end to the air outflow end of the positive pressure generating section. Head slider. 6. The distance from the center line along the direction from the air inflow end of the positive pressure generating portion toward the air outflow end to the end defining the first negative pressure generating portion is the second negative pressure. The head slider according to claim 1, wherein the head slider is formed so as to be shorter than a distance to an end defining the pressure generating portion. 7. A portion of the second negative pressure generating portion where the area of the positive pressure generating portion is narrower divides the second negative pressure generating portion from an end that divides the first negative pressure generating portion. 7. The head slider according to claim 6, wherein the head slider is formed up to the end. 8. A portion of the second negative pressure generating section where the area of the positive pressure generating section is narrower defines the second negative pressure generating section from an end that defines the first negative pressure generating section. The head slider according to claim 7, wherein the head slider has an inclined portion corresponding to the air flow up to the end. 9. A magnetic disk device for recording / reproducing information on / from a magnetic disk by a magnetic head, wherein an air flow introducing section for introducing an air flow and a surface formed on a surface facing the magnetic disk and introducing from the air flow introducing section. A positive pressure generating portion for generating a positive pressure by an air flow, and a surface facing the magnetic disk, which is formed from an air inflow end of the positive pressure generating portion to near the center of the positive pressure generating portion, An air inflow end side of the positive pressure generation unit is closed by the air flow introduction unit, and a first negative pressure generation unit that generates a negative pressure by an air flow introduced from the air flow introduction unit is opposed to the magnetic disk. A surface that is continuous with the air outflow end of the first negative pressure generating portion and extends to the air outflow end of the positive pressure generating portion, the air outflow end side of the positive pressure generating portion is open, and Inside the negative pressure generator of 1 The positive pressure generating portion is formed so that the area of the positive pressure generating portion becomes narrower from the vicinity toward the air outflow end of the first negative pressure generating portion, and negative pressure is generated by the air flow introduced from the air flow introducing portion. 2. A magnetic disk drive, comprising: a negative pressure generating unit; and a head slider that mounts the magnetic head and that floats above the magnetic disk by the air flow.