JPH08203054A - Magnetic head slider and magnetic head slider supporting mechanism - Google Patents

Abstract

PURPOSE: To provide a contact recording magnetic head slider capable of reducing vibrations caused by contact with a rotary magnetic disk. CONSTITUTION: By providing a projecting section 21 in contact with the inner peripheral side of a magnetic disk and a projecting section 22 in contact with its outer peripheral side and setting the contact area of the inner peripheral side projecting section 22 with the magnetic disk larger than that of the outer peripheral side projecting section 21, shearing forces with the magnetic disk applied to both projecting sections 21 and 22 due to a difference in circumferential speeds are balanced and vibrations are reduced. The shearing forces are also balanced by adjusting the distance from a pivot for instructing a magnetic head slider to the projecting section and surface roughness on the projecting section. Thus, the movement of the magnetic head slider is made stable and a high density recording/reproducing of data is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head slider having a magnetic head for recording / reproducing data on / from a magnetic disk and a magnetic head slider support mechanism for supporting the slider, and more particularly to a magnetic head slider supporting a slider. The present invention relates to a magnetic head slider and a magnetic head slider support mechanism suitable for a contact recording type magnetic head element for recording and reproducing.

[0002]

2. Description of the Related Art In a general magnetic disk device, a magnetic head slider mounting a magnetic head element is brought into contact with the disk when the magnetic disk is stopped, and the magnetic head slider is levitated by an air viscous flow when the magnetic disk rotates at a high speed. A so-called contact start / stop system for recording and reproducing data is adopted. However, in recent years, a magnetic recording apparatus of the contact recording type has been proposed which records and reproduces data in a state where the magnetic head slider is always slid on the magnetic recording disk in order to further increase the recording density.

An example of this contact recording type magnetic disk device is Japanese Patent Laid-Open No. 178017/1993.
As described in Japanese Patent Application Laid-Open No. 2004-242242, the magnetic head slider and the magnetic head slider are supported by reducing the contact surface of the magnetic disk and reducing the pressing load for pressing the magnetic head slider against the magnetic disk surface from several tens of milligrams to several hundreds of milligrams. The supporting mechanism is integrated, or the magnetic head slider and the supporting mechanism for supporting the magnetic head slider are separated from each other as described in Japanese Patent Laid-Open No. 06-44715, and some modifications are made on the surface of the magnetic head slider facing the magnetic disk. As described in Japanese Patent Application Laid-Open No. 06-12808, by utilizing the air film floating force and the liquid film floating force as the force acting between the magnetic head slider and the magnetic disk, only the slider outflow end is magnetic disk. It has been proposed that the contact recording be performed by contacting with the contact.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The technique described in Japanese Patent No. 8017 is an integrated magnetic head slider support mechanism in which a magnetic head slider and a support mechanism for supporting the magnetic head slider are integrated, and the support mechanism is rigid and seeks on a rotating magnetic disk. It seems that the effect of the tip of the magnetic head vibrating due to the shearing force generated between it and the magnetic disk is small, but on the contrary, when the spring part is too rigid, it is twisted in the rolling direction, or when the magnetic head slider is used. When the mounting error of the magnetic disk spacing is large, there is a problem that it is extremely difficult to correctly set the minute protrusions formed around the magnetic head element part on the magnetic disk surface.

Further, in the technique disclosed in Japanese Patent Laid-Open No. 06-44715, a shearing force is generated due to the contact between the rotating magnetic disk and the protrusion arranged on the surface of the magnetic head slider facing the magnetic disk, and a rotational moment is applied to the magnetic head slider. However, there is a problem that the magnetic head slider lacks posture stability. Specifically, in general, the shearing force F that acts between two bodies that move relative to each other is μ as the viscosity coefficient of the fluid existing between the two bodies, U as the relative velocity between the two bodies, Z as the distance between the two bodies, and the surface. Where A is the area, and the slider movement direction during seek is the slider width direction, sliding protrusions are arranged on both sides in the width direction, and a slider support point is provided in the middle of the protrusions. When they are arranged, when the contact areas of the sliding projections on the magnetic disk facing surface are the same, the magnitude of the shearing force acting on the inner and outer projections due to the difference in the peripheral speed of the magnetic disks contacting each projection. However, rotation moment is generated in the in-plane direction of the magnetic disk centering on the slider support point that always supports the slider, and as a result, the magnetic head slider easily vibrates, and the magnetic head moves from one cylinder to another. Slider moving (sheet - h) further magnetic head slider by had trouble say easily vibrate.

[0006]

[Equation 1]

Further, in the magnetic head slider described in Japanese Patent Application Laid-Open No. 06-12808, since the magnetic disk has one protrusion for sliding on the magnetic disk during rotation, the magnetic head slider moves (seeks). At this time, the magnetic head slider has a problem in that a rotational moment is generated in the in-plane direction of the magnetic disk centering on the slider supporting point, and the magnetic head slider is very likely to vibrate.

An object of the present invention is to eliminate the above-mentioned problems caused by the prior art, and to reduce the vibration of the magnetic head slider due to the above-mentioned shearing force and to make a stable contact record with the magnetic disk. -To provide a magnetic head slider for a magnetic head and a magnetic head slider support mechanism.

[0009]

In order to achieve the above object, the present invention comprises a magnetic head element and two sliding protrusions arranged in the inner circumferential direction and the outer circumferential direction of the magnetic disk centering on the magnetic head element. In the magnetic head slider, the first feature is that the contact area of the sliding projection on the inner circumference side with the magnetic disk is larger than the contact area of the projection section on the outer circumference with the magnetic disk.

The present invention also relates to the above-mentioned first feature.
A second feature is that the contact area of one sliding protrusion with the magnetic disk is made inversely proportional to the peripheral velocity of the magnetic disk with which each protrusion contacts.

Further, the present invention provides a magnetic head slider having a magnetic head element and two sliding projections arranged in the inner and outer circumferential directions of the magnetic disk with the magnetic head element as a center. The protrusions have the same contact area with the magnetic disk, and the gap between the magnetic head element and the inner peripheral side sliding protrusion is offset so as to be larger than the gap between the magnetic head element and the outer peripheral side sliding protrusion. The third feature is what was done.

Further, according to the present invention, the distance between the magnetic head element and the inner peripheral side sliding projection portion and the distance between the magnetic head element and the outer peripheral side sliding projection portion in the third feature are set to the respective sliding projections. The fourth feature is that the portion is inversely proportional to the peripheral velocity of the magnetic disk with which the portion contacts.

Further, according to the present invention, in a magnetic head slider having a magnetic head element and two sliding projections arranged in the inner circumferential direction and the outer circumferential direction of the magnetic disk centering on the magnetic head element, the sliding on the inner circumferential side is performed. A fifth feature is that the surface roughness of the contact portion of the moving protrusion with the magnetic disk is made larger than the surface roughness of the contact portion of the protrusion on the outer peripheral side with the magnetic disk.

Further, according to the present invention, a magnetic head slider extending in the radial direction of the magnetic disk and having a plurality of projections in contact with the magnetic disk, and the magnetic head slider is supported by a supporting portion, and the center of rotation is centered. In a magnetic head slider support mechanism including a carriage rotating on a magnetic disk, a rotation moment generated by a protrusion of the carriage closer to the rotation center than a support portion of the magnetic head slider and the rotation center of the slider support portion. A sixth feature is that the magnetic head slider is supported via the support portion at a position where the rotational moment generated by the projection portion farther away becomes equal.

[0015]

The magnetic head slider according to the first feature is
The contact area of the sliding projection on the inner circumference side with the magnetic disk is
By making the protrusion on the outer peripheral side larger than the contact area with the magnetic disk, the shearing force applied to the protrusion on the inner peripheral side having a lower peripheral speed than the outer peripheral side is increased to stabilize the behavior of the magnetic head slider. be able to.

In the magnetic head slider according to the second feature, the contact area of the sliding projections arranged on the inner and outer circumferences with the magnetic disk is made inversely proportional to the peripheral speed of the magnetic disk with which each projection contacts. As a result, the shearing force applied to the slider can be balanced to stabilize the behavior of the magnetic head slider.

In the magnetic head slider according to the third feature, the gap between the magnetic head element and the inner peripheral side sliding protrusion is
By offsetting the magnetic head element so that it is larger than the distance between the outer peripheral side sliding projection and the magnetic head element, the rotational moment centered on the magnetic head element is balanced from the inner and outer peripheral projections having the same contact area. The behavior of the slider can be stabilized.

In the magnetic head slider according to the fourth feature, the distance between the magnetic head element and the inner peripheral side sliding projection portion and the distance between the magnetic head element and the outer peripheral side sliding projection portion are set to the respective sliding projections. By making the portions inversely proportional to the peripheral velocity of the magnetic disk with which they come into contact, the rotational moment about the magnetic head element can be favorably balanced and the behavior of the magnetic head slider can be stabilized.

In the magnetic head slider according to the fifth feature, the surface roughness of the contact portion of the sliding protrusion on the inner peripheral side with the magnetic disk is determined by the surface roughness of the contact portion of the protrusion on the outer peripheral side with the magnetic disk. By making it coarser than that, it is possible to balance the shearing forces applied to both protrusions and stabilize the behavior of the magnetic head slider.

In the magnetic head slider support mechanism according to the sixth feature, the carriage is farther from the rotation center than the rotation moment generated by the protrusion of the carriage closer to the rotation center than the magnetic head slider support portion and the slider support portion. By supporting the magnetic head slider through the support portion at a position where the rotational moment generated by the protrusion is equal, the shearing force applied to the magnetic head element and the sliding protrusion during the seek operation of the magnetic head slider is balanced. Therefore, the behavior of the magnetic head slider can be stabilized.

[0021]

【Example】

<First Embodiment> An embodiment of the present invention will now be described in detail with reference to the drawings. 1 is a plan view and a side view of a magnetic head slider according to a first embodiment of the present invention, FIG. 2 is a perspective view of the magnetic head slider, and FIG. 3 is a magnetic disk of the magnetic head slider mounted on a load arm. It is a figure for explaining a moment. First, as shown in FIGS. 1 and 2, the magnetic head slider 10 according to the present embodiment extends in the radial direction of the magnetic disk and has a thin film element forming portion 12 having a central magnetic head element projection portion 23 and a thin film element portion 13. And a protrusion 22 arranged in the outer peripheral direction of the magnetic disk and a protrusion 21 arranged in the inner peripheral direction of the magnetic disk are formed by etching on the surface facing the magnetic disk. The load arm 30 by means of the pivot 32 and the gimbal 31 contacting the
It is configured to be elastically supported by. The magnetic head element protrusion 23 and the thin film element portion 13 form a magnetic head element for recording and reproducing data with the magnetic disk.

The magnetic head slider 10 according to this embodiment.
Is characterized in that the contact area of the protrusions 21 in the inner peripheral direction is larger than the contact area of the protrusions 22 on the outer peripheral side. That is, when the contact areas of both the protrusions 21 and 22 are the same, the shearing force of the outer peripheral side protrusion becomes larger than the shearing force of the inner peripheral side protrusion due to the difference in peripheral speed of the magnetic disk with which the protrusions contact. Since the rotational moment is generated and the posture stability of the magnetic head slider is lost, in this embodiment, the contact area of the protrusion 21 in the inner circumferential direction is made larger than that in the outer circumferential side to equalize the shearing force. It is configured like.

Regarding the size of the magnetic head slider 10, the longitudinal direction of the load arm 30 is the length direction of the slider, and the moving direction of the load arm when seeking is the width direction of the slider. , Length 0.5 mm, width 1 mm, thickness 0.
It is about 4 mm, and the height of the protrusion is preferably 6 μm. Although the etching method is used as the method for forming the protrusions, other mechanical processing may be used, and pivots are not required, and there is no problem as long as the one having a pivot function is used.

Next, the shearing force of each projection mentioned above will be described with reference to FIG. FIG. 3 is a diagram showing a state in which the magnetic head slider 10 according to the present embodiment is supported by a load arm 30 and the load arm 30 is arranged on the surface of a magnetic disk 50 rotated by a carriage 40.
For ease of understanding, the voice coil motor that rotationally drives the carriage 40 is omitted, and is a perspective view from above the magnetic disk surface. Now, in FIG. 3, points obtained by projecting the inner protrusion 21 and the outer protrusion 22 on a plane parallel to the magnetic disk are referred to as an inner protrusion projection surface 21 'and an outer protrusion projection surface 22'. , Coplanar magnetic disk 50
When the rotation center of the magnetic disk is a point 51, the area of the magnetic disk contact surface of the projection 21 is S1, the distance from the rotation center 51 of the magnetic disk to the projection projection surface 21 'is Q1, and the projection projection surface 2 is
The magnetic disk rotation speed at the 1'position is U1,
Similarly, the projection 22 and the magnetic head element projection 23 will be defined and described as Q2, U2, Q3, and U3.

In general, the shearing force F due to the shearing force acting between two bodies moving relative to each other is μ as the viscosity coefficient of the lubricant existing between the two bodies, U as the relative velocity between the two bodies, Z as the distance between the two bodies,
When the area of the surface is A, it can be obtained by the above-mentioned equation 1. When the formula 1 is applied to the protrusions 21 to 23, the shearing force between the protrusion 21 and the magnetic disk is F1, the shearing force between the protrusion 22 and the magnetic disk is F2, and the magnetic head element protrusion 2 is
3 is the shearing force between the magnetic disk and F3,
It is represented by.

[0026]

[Equation 2]

[0027]

(Equation 3)

[0028]

[Equation 4]

Here, the pivot 32 is in contact with the slider 10.
Points on the plane parallel to the magnetic disk are defined as pivot projection points 32 ', and the distance from the pivot projection point 32' to the inner circumferential projection projection surface 21 'and the pivot projection point 3'
The ratio of the distance from 2 ′ to the projection surface 22 ′ on the outer circumferential side is c:
Assuming d, the balance of the rotational moment around the pivot can be expressed by Equation 5.

[0030]

(Equation 5)

Here, if c: d = 1: 1 (when the pivots are located at the centers of both protrusions), the following equation 6 is obtained.

[0032]

(Equation 6)

By substituting the equations 2 and 3 into the equation 6 and rearranging, the equation 7 can be obtained, and in order to balance the rotational moments generated on both protrusions having the same inter-pivot distance, the inner peripheral protrusion 21 is formed. It is understood that the area ratio of the magnetic disk contact surface of the outer peripheral protrusion 22 and the outer peripheral protrusion 22 may be set to the reciprocal ratio of the speeds at the positions of the inner peripheral protrusion 21 and the outer peripheral protrusion 22.

[0034]

(Equation 7)

Further, since the peripheral speed ratio corresponds to the radius ratio from the magnetic disk, substituting this relationship yields Equation 8, and it can be seen that the reciprocal ratio of the radius is also acceptable. Therefore, in the magnetic head slider of the embodiment shown in FIG. 1, since the contact area ratio of both protrusions having the same inter-pivot distance is made inversely proportional to the radius of the magnetic disk contacting, the rotation generated on both protrusions is increased. By balancing the moments, the vibration can be reduced and the magnetic disk can slide stably.

[0036]

(Equation 8)

When the areas of the magnetic disk contact surfaces of the inner peripheral protruding portion 21 and the outer peripheral protruding portion 22 are the same, S 1
By substituting = S2 and rearranging, Formula 9 is obtained. The ratio of the distance from the pivot projection point 32 'to the inner projection projection surface 21' and the distance from the pivot projection point 32 'to the outer projection projection surface 22'. Can be designed to have the reciprocal ratio of the speeds at the positions of the inner peripheral protrusion 21 and the outer peripheral protrusion 22, and in order to balance the rotational moments generated in both protrusions having the same contact area, The distance ratio of the part to the pivot projection point may be inversely proportional, and this embodiment will be described later.

[0038]

[Equation 9]

Although the present principle has been described at the position where the yaw angle is 0 degree, even when the yaw angle is provided, the area of the magnetic head element projection 23 is the projections 22 and 27 provided on the inner and outer circumferences.
When it is smaller, or when the distance between the pivot 32 and the magnetic head element protrusion 23 is smaller than the distance between the pivot 32 and the inner peripheral protrusion 27 or between the pivot 32 and the outer peripheral protrusion 22, the range is negligible.

<Second Embodiment> FIG. 4 is a plan view of a magnetic head slider according to a second embodiment of the present invention. In the magnetic head slider according to the present embodiment, the areas of the magnetic disk contact surfaces of the inner peripheral protruding portion 27 and the outer peripheral protruding portion 22 are made the same based on the principle shown in the above equation 9, and the pivot 32 when viewed from the magnetic disk surface. To the inner circumference side projection 27 and the distance from the pivot 32 to the outer circumference side projection 22 are set to the reciprocal ratio of the radii at the positions of the inner circumference projection 27 and the outer circumference projection 22, and the magnetic force is applied to the pivot position. Head element protrusion 2
3 is arranged. In the magnetic head slider according to the present embodiment, the position of the magnetic head element protrusion 23 is moved by the same amount as the offset amount of the pivot, so that the influence of the rotational moment due to the magnetic head element protrusion 23 can be ignored. .

<Third Embodiment> FIG. 5 is a plan view of a magnetic head slider according to a third embodiment of the present invention. In the magnetic head slider according to the present embodiment, as in the second embodiment, the areas of the magnetic disk contact surfaces of the inner peripheral protruding portion 27 and the outer peripheral protruding portion 22 are made the same, and when viewed from the magnetic disk surface, from the pivot 32. The ratio of the distance to the inner peripheral side protrusion 27 and the distance from the pivot 32 to the outer peripheral side protrusion 22 is set to the reciprocal ratio of the radii at the positions of the inner peripheral protrusion 27 and the outer peripheral protrusion 22, and the magnetic head element protrusion The position 23 is arranged in the middle of the slider in the width direction.

Therefore, in this embodiment, the rotation mode is determined by the shearing force acting on the magnetic head element protrusion 23 and the distance of the pivot 32.
However, the area of the magnetic head element protrusion 23 is smaller than that of the protrusions 22 and 27 provided on the inner and outer circumferences, and the distance between the pivot 32 and the magnetic head element protrusion 23 is the pivot 32 and the inner peripheral protrusion 27 or the pivot. If it is smaller than the distance between 32 and the outer peripheral projection 22, it can be ignored. Whether or not the position of the magnetic head element projecting portion 23 actually needs to be offset depends on the size of the magnetic head element projecting portion 23 and the offset amount. Therefore, if it cannot be ignored, it is necessary to take this influence into consideration when performing the calculation. is there.

FIG. 6 shows a magnetic disk device 60 on which the lower magnetic head slider is mounted. In the magnetic disk device 60, a magnetic head slider 10 supported by a load arm 30 is mounted on a magnetic disk 50 supported by a spindle 52 rotated by a motor (not shown) of a base 60 by a carriage 40 and a drive mechanism. It shows a structure in which it moves in an arc shape and is covered with a cover 62 in a hermetically sealed manner, and there is no great difference in appearance from a magnetic disk device equipped with a floating magnetic head slider.

As an example, the inner peripheral protruding portion 21 and the outer peripheral protruding portion 2
When the magnetic head slider of the present invention having a gap of 2 is 0.9 mm is mounted on a 1.8-inch magnetic disk device, when the magnetic head slider 10 is at the innermost cylinder position, the inner peripheral projection 21 and the outer periphery are provided. Since the speed ratio at the position of the side protrusion 22 corresponds to the radius ratio, the ratio value is 12 / 12.9 =
It becomes 0.93, and the inner peripheral side protruding portion 21 and the outer peripheral side protruding portion 22.
Area ratio S1 / S2 of the magnetic disk facing surface is 1 / 0.93
= 1.075. In this embodiment, the inner peripheral projection 21 is a cylinder having a diameter of 30 μm (projection height 6 μm), and the inner peripheral projection 21 is a cylinder having a diameter of 29 μm (projection height 6 μm). (The area ratio at this time is 1.07.) With respect to this area ratio, if the disk size becomes smaller and the seek range further uses the inner circumference of the disk, the area ratio becomes larger.

<Fourth Embodiment> FIG. 7 is a view for explaining the principle of a magnetic head slider according to another embodiment of the present invention in consideration of stability during seek. Here, in order to explain the principle of the present embodiment, it is shown as a perspective view from the surface of the magnetic disk. A point obtained by projecting the inner circumferential side projection 21 and the outer circumferential side projection 22 on a plane parallel to the magnetic disk 50 is an inner circumferential side projection projection plane 21 ', an outer circumferential side projection projection plane 22', and rotation of the carriage on the same plane. When the center is the carriage rotation center 41, the area of the contact surface of the protrusion portion 21 with the magnetic disk is S1, and the protrusion projection surface 2 from the carriage rotation center 41.
The distance to 1'is defined as R1, and the moving speed at the time of the magnetic head slider seek at the position of the protrusion 21 is defined as V1, and similarly for the protrusion 22 and the magnetic head element protrusion 23, R2, V2, R3. , V3 is defined. At this time, exactly V
1 and V2 must be perpendicular to the vectors of R1 and R2, but as shown in FIG. 6, the slider width is sufficiently smaller than the distance from the seek center 41, so the velocity direction is the same as V3. But it doesn't matter.

In the magnetic head slider according to the present embodiment, the shearing force Fs newly applied under the respective projections at the time of seeking can be obtained from the shearing force of several 1 to several 10.

[0047]

[Equation 10]

[0048]

[Equation 11]

[0049]

(Equation 12)

Here, when the pivot projection point 32 'obtained by projecting the pivot 32 on a plane parallel to the magnetic disk and the carriage rotation center 41 on the same plane are connected, the pivot projection point 32' and the pivot projection point 32 'are connected. Also, in the figure, the ratio of the distance between the protrusions located closer to the carriage rotation center 41 and the distance between the pivot projection points 32 'and the distances of the projections located farther from the carriage rotation center 41 than the pivot projection points 32' is shown in the figure. As a: b, the carriage rotation center 4
1 to the rotation moment of the magnetic head slider in the in-plane direction of the magnetic disk generated by the protrusion located closer to the pivot projection point 32 ', and to the position farther from the rotation center rotation center 41 than the pivot projection point 32'. In order to dispose the pivot 32 at a position where the rotational moments of the magnetic head slider in the in-plane direction of the magnetic disk generated by a certain protrusion are equal, the relationship of Expression 13 must be satisfied.

[0051]

(Equation 13)

When the projections 21 and 22 and the projection portion of the magnetic head element projection 23 are projected onto the plane parallel to the magnetic disk, they are projection projection surfaces 21 'and 22' and the projection projection point 23 'of the head element portion, respectively. Distance R1 from carriage rotation center 41 on the same plane to projection projection plane 21 'and carriage rotation center 41 on the same plane to projection projection plane 22'
When the distances R2 are equal to each other, R2 = R1 to V2 = V1 and V3 = (R3 / R1) × V1.

[0053]

[Equation 14]

Therefore, the distance between the pivot projection point 32 'and the projection located closer to the center of rotation 41 than the pivot projection point 32', and the pivot projection point 32 'and the pivot projection point 3
If the ratio of the distances of the protrusions farther from the rotation center 41 than 2'is a: b as shown in the figure, the relationship of a / b is as follows, but the slider length is lower. If it is sufficiently smaller than the door dome, it can be considered that R3 / R1≈1, so that a / b can be expressed by the following equation 16.

[0055]

(Equation 15)

[0056]

[Equation 16]

Therefore, the pivot projection point 32 'and the magnetic disk facing area S2 + S3 of the protrusion located closer to the rotation center 41 than the pivot projection point 32', and the pivot projection point 32 'and the pivot projection point 32'. Center of rotation 41
The magnetic disk facing area S3 of the protrusion that is far from
The rotational momentum at the time of seek can be reduced by designing the relationship with and to be inversely proportional.

For example, each projection area ratio is S1: S2: S3 =
When 1.07: 1: 1, a / b = S3 / (S1 + S
By setting 2) = 1 / (1 + 1.07) = 0.483, the rotational momentum at the time of seek can be reduced.

<Fifth Embodiment> FIG. 8 shows a magnetic head slider support mechanism including a magnetic head slider according to another embodiment of the present invention. In this magnetic head slider, when the distance from the carriage rotation center 41 to the pivot projection point is Rp, and the distance from the carriage rotation center to the slider gravity center projection point projected on the magnetic disk surface of the slider gravity center 14 is Rg, Rp = This is a magnetic head slider support mechanism in which the rotational moment of the magnetic head slider generated in the in-plane direction of the magnetic disk centering on the pivot 32 during seek acceleration / deceleration is zero.

Since the center of gravity 14 of the slider is located at the center of the slider in the lengthwise direction in the figure, the ratio of the facing areas of the magnetic disks of the respective projections is given by the equation 16: a / b = S3 / (S1
When + S2) = 1, the rotational moment becomes 0. Therefore, the area ratio of each protrusion is S1: S2: S3 = 1.07: 1:
It was set to 2.07.

<Sixth Embodiment> FIG. 9 shows a magnetic head slider according to another embodiment of the present invention. In FIG. 9, the magnetic head element protrusion is not formed in the center of the magnetic head slider, but the magnetic head element protrusion 24 is on the inner peripheral side of the magnetic head slider with respect to the magnetic disk, and the sliding protrusion is on the outer peripheral side. 25 and the pivot 32, and the protrusions 24 and 2
5 is characterized in that a sliding protrusion 26 is formed on the side opposite to the side 5. In this embodiment, in order to balance the shearing force of the inner and outer peripheral protrusions, the magnetic head element protrusion 2 on the inner peripheral side is formed.
The area of the magnetic disk facing surface of No. 4 is larger than the contact area of the sliding projection 25 on the outer peripheral side of the magnetic disk facing surface.

As an improved example of this embodiment, the magnetic head element projection 24 is provided on the outer peripheral side and the sliding projection 2 is provided on the inner peripheral side.
5, or the magnetic head element projections 24 are formed on both the inner and outer circumferences. In both cases, the area of the magnetic disk facing surface of the projections 24 on the inner circumference side faces the magnetic disk of the projections 25 on the outer circumference side. Larger than the surface area,
Alternatively, it is necessary to balance the shearing force by adjusting the distance between the protrusion and the pivot. As described above, in the magnetic head slider according to the present embodiment, the magnetic head element can be arranged on any protrusion.

<Seventh Embodiment> FIG. 10 shows a magnetic head slider according to another embodiment of the present invention. In this embodiment, FIG.
In the invention, the area of the magnetic disk facing surface of the protrusion on the inner peripheral side is made equal to the area of the magnetic disk facing surface of the protrusion on the outer peripheral side, but the pivot position 32 and the sliding protrusion 26 are positioned on the outer peripheral side. In addition to being offset, the thin film element portion 13 is mounted on both the inner and outer protrusions 24.

The present magnetic head slider can balance the shearing force to prevent vibrations and the like and increase the number of magnetic head elements even if the contact areas of the protrusions 24 on the inner and outer circumferences are the same due to the offset. Thus, the recording / reproducing speed can be improved by high density recording or parallel operation.

<Eighth Embodiment> FIG. 11 shows a magnetic head slider and a supporting mechanism according to another embodiment of the present invention. This embodiment is an embodiment when combined with a substantially plate-shaped load arm 33 having a pivot-less elastic force. The magnetic head slider 10 has a magnetic head element projection 23 having a thin film element, a projection 22 on the outer peripheral side of the magnetic disk, and a projection 21 having a larger contact area than the projection 22 on the outer peripheral side, as in the above embodiment. The magnetic head slider 10 and a load arm 33 that elastically supports the back surface of the slider 10 by a notch so as to follow the rolling and pitch directions.

In the magnetic head slider according to the present embodiment, even in the load arm 33 having no pivot, the rotation within the slider mounting surface is suppressed by balancing the shearing forces of the projections 21 and 22. be able to.

<Ninth Embodiment> In each of the above embodiments,
In order to reduce the rotational moment in the in-plane direction of the magnetic disk about the slider support point of the magnetic head slider,
Increase the magnetic disk contact area of the inner peripheral side protrusion,
I've offset the pivot to the outer circumference,
In addition, a method of reducing the rotation moment by changing the surface roughness of the magnetic disk contact surface of each protrusion, or adjusting the shearing force by changing the material on the magnetic disk contact surface of each protrusion by using the sputtering method Methods etc. are also possible. An example thereof will be described below with reference to FIG. The magnetic head slider 10 shown in FIG. 12 has the same load arm 3 as in the previous embodiment.
3, the inner peripheral protrusion 28 and the protrusion 2 having the same contact area.
2 and the magnetic head slider 10 having the magnetic head element projection 23 are arranged, and the surface roughness of the surface of the inner circumferential projection 28 that contacts the magnetic disk is the same as the surface roughness of the surface of the outer circumferential projection 22 that contacts the magnetic disk. It is characterized by making it larger than

As described above, the magnetic head slider according to the present embodiment can suppress the generation of the rotation moment by adjusting the surface roughness of the protrusions 22 and 28 to a value at which the shearing force is balanced.

In each of the above-described embodiments, the shape of the magnetic disk facing surface of the protrusion formed on the magnetic disk facing surface of the magnetic head slider has been described by using a circular or rectangular shape. However, the present invention is not limited to this. The contact shape is not limited to this, and may be an elliptical or polygonal contact shape.

The present invention can also be expressed as the following embodiments. <Aspect 1> As a magnetic head slider that moves relative to a mounted magnetic disk, two projections for sliding with the magnetic disk and one projection for a magnetic head element portion, or one projection for sliding and a magnetic head are provided on a surface facing the magnetic disk. For a slider having two head element projections, particularly three projections,
When the slider support points provided on the magnetic head slider support mechanism for supporting the slider and the rotation center of the carriage for moving the magnetic head slider support mechanism are projected on a plane parallel to the magnetic disk, the As for the positional relationship, there is one protrusion on the line connecting the slider support point and the rotation center of the carriage, and the remaining two protrusions are magnetic with respect to the slider existing across the line connecting the slider support point and the rotation center of the carriage. The magnetic head slider is rotated in the in-plane direction of the magnetic disk about the slider supporting points provided on the magnetic head slider supporting mechanism for supporting the slider by the shearing force acting between the magnetic disk and the three protrusions contacting the disk. When this magnetic head slider is placed on a rotating magnetic disk in order to reduce the rotational moment during rotation Of the two protrusions existing across the line connecting the slider support point and the center of rotation of the carriage, the protrusion on the inner side of the disc has a larger area of contact surface with the magnetic disk than the protrusion on the outer side of the disc. A magnetic head slider characterized by being enlarged.

<Aspect 2> In the magnetic head slider of Aspect 1, the magnetic head slider support mechanism for supporting the slider of the magnetic head slider by the shearing force acting between the three protrusions contacting the magnetic disk and the magnetic disk. In order to reduce the rotational moment when rotating in the in-plane direction of the magnetic disk about the slider support point provided on the disk, the projection on the inner circumference side of the disk is set as a magnetic disk rather than the projection on the outer circumference side of the disk. When increasing the area of the contact surface of the magnetic head slider, the area ratio of these protrusions is made inversely proportional to the disk peripheral velocity ratio at the radial position below the protrusion.

<Aspect 3> As a magnetic head slider supporting mechanism having a magnetic head slider that moves relative to a mounted magnetic disk, two projections for sliding the magnetic disk and a magnetic head are provided on a surface facing the magnetic disk. When supporting a slider having one element projection or one projection for sliding and two magnetic head element projections, particularly three projections and a slider support provided in a magnetic head slider support mechanism for supporting the slider. When the point and the center of rotation of the carriage for moving the magnetic head slider support mechanism are projected on a plane parallel to the magnetic disk, the positional relationship on this plane is as follows: on the line connecting the slider support point and the center of rotation of the carriage. There is one protrusion, and the remaining two protrusions are on the slider that exists across the line connecting the slider support point and the carriage rotation center. In the in-plane direction of the magnetic disk, centering around the slider supporting points provided in the magnetic head slider supporting mechanism for supporting the slider of the magnetic head slider by the shearing force acting between the magnetic disk and the three protrusions contacting the magnetic disk. When this magnetic head slider is placed on a rotating magnetic disk in order to reduce the rotation moment when the slider rotates, the line that connects the slider support point and the carriage rotation center is set as the slider support point position. A magnetic head slider support mechanism, wherein the magnetic head slider support mechanism is arranged so as to be offset from the center of two projections existing so as to sandwich this line to the outer circumference of the disk.

<Aspect 4> In the magnetic head slider support mechanism of Aspect 3, the offset amount of the slider support point to the outer peripheral side of the disk is as follows: a protrusion on the inner peripheral side of the disc and a protrusion on the outer peripheral side of the disc contact the magnetic disk. If the area is the same, the ratio of the distance from the slider support point to the inner-side protrusion to the distance from the slider support point to the outer-side protrusion should be inversely proportional to the disk peripheral velocity ratio at the radial position below the protrusion. Characteristic magnetic head slider support mechanism.

<Aspect 5> As a magnetic head slider support mechanism having a magnetic head slider that moves relative to a mounted magnetic disk, two projections for sliding the magnetic disk on the surface facing the magnetic disk and a magnetic head element portion are provided. When a slider having one projection or one sliding projection and two magnetic head element projections is supported, the magnetic head slider by the shearing force acting between the magnetic disk and the three projections contacting the magnetic disk, In order to reduce the rotational moment when rotating in the in-plane direction of the magnetic disk about the slider support point provided on the magnetic head slider support mechanism for supporting the slider, a certain radial position on the rotating magnetic disk A new seek method during movement (seeking) in which the magnetic head slider moves from a sliding state to a different radial position. In order to remove the influence of the shearing force in the
When three projections, a slider support point provided on the magnetic head slider support mechanism for supporting the slider, and a rotation center of the carriage for moving the magnetic head slider support mechanism are projected on a plane parallel to the magnetic disk, As a positional relationship on the surface, a rotation moment generated by a protrusion located closer to the rotation center than the slider support point,
A magnetic head support mechanism characterized in that the slider support points are arranged so that the rotation moments generated by the projections on the side of the rotation center farther than the slider support points become equal.

<Aspect 6> When the magnetic head slider support mechanism of Aspect 5 is projected on a plane parallel to the magnetic disk, the positional relationship on this plane is closer to the carriage rotation center than the projection point of the slider support point. The sum of the area of each protrusion and the distance to this carriage rotation center multiplied by the area to the rotation center of each protrusion farther from this rotation center than the slider support dot. A magnetic head support mechanism characterized in that slider support points are arranged at positions equal to the sum.

<Aspect 7> With respect to the magnetic head slider support mechanism of Aspect 5, when the seek operation is started and when the seek operation is accelerated / decelerated, when the inertial force acts on the center of gravity of the magnetic head slider, the slider is moved. In order to eliminate the influence of the rotational moment due to this inertial force when rotating in the in-plane direction of the magnetic disk about the slider supporting point provided on the magnetic head slider supporting mechanism for supporting, the slider supporting point projection point The magnetic head support mechanism is characterized in that the distance from the center of rotation of the carriage to the same plane is the same as the distance from the center of rotation of the slider projected onto the magnetic disk surface to the center of rotation of the carriage.

<Aspect 8> As a magnetic head slider that moves relative to the mounted magnetic disk, two projections for sliding with the magnetic disk and one projection for a magnetic head element or a projection for sliding are provided on the surface facing the magnetic disk. For a slider having one and two magnetic head element protrusions, particularly three protrusions, a slider support point provided on the magnetic head slider support mechanism for supporting the slider, and a carriage for moving the magnetic head slider support mechanism. When the center of rotation is projected on a plane parallel to the magnetic disk, there is one protrusion on the line connecting the slider support point and the center of rotation of the carriage as the positional relationship on this plane, and the remaining two protrusions support the slider. For the slider that exists across the line connecting the points and the center of rotation of the carriage, the three protrusions that contact the magnetic disk and the magnetic The rotational moment of the magnetic head slider due to the shearing force acting between the disks when rotating in the in-plane direction of the magnetic disk about the slider support point provided in the magnetic head slider support mechanism for supporting the slider is reduced. For this reason, when this magnetic head slider is arranged on a rotating magnetic disk, of the two projections existing across the line connecting the slider support point and the rotation center of the carriage, The magnetic head slider is characterized in that the surface roughness of the contact surface with the magnetic disk is larger than that of the protrusion on the outer peripheral side of the disk.

[0078]

As described above, in the magnetic head slider according to the present invention, the contact area of the sliding projections on the inner circumference side with the magnetic disk is made larger than the contact area of the projections on the outer circumference side. The behavior of the magnetic head slider can be stabilized by increasing the shearing force with the magnetic disk and balancing it with the shearing force with the sliding projection on the outer peripheral side due to the peripheral speed difference.

The magnetic head slider according to the present invention is
By making the area ratio of the sliding projections inversely proportional to the peripheral speed of the contacting magnetic disk, the area ratio can be suitably determined and the behavior of the magnetic head slider can be stabilized.

Further, in the magnetic head slider according to the present invention in which the contact areas of the sliding projections on the inner and outer circumferences are the same, the magnetic head element position is centered by offsetting the magnetic head element position to the outer sliding projection side. As a result of balancing the shearing forces generated on the inner and outer protrusions,
The behavior of the magnetic head slider can be stabilized.

In the magnetic head slider in which the contact areas of the sliding protrusions are the same, the offset amount of the magnetic head element is inversely proportional to the peripheral speed of the magnetic disk, so that the offset amount is appropriately determined. The behavior of the magnetic head slider can be stabilized.

The magnetic head slider according to the present invention is
The surface roughness of the contact portion of the sliding protrusion on the inner circumference side with the magnetic disk is made rougher than the surface roughness of the contact portion of the outer protrusion on the outer circumference side, and the shearing force of the protrusion on the inner circumference side with the magnetic disk is increased to The behavior of the magnetic head slider can be stabilized by balancing the shearing force with the sliding protrusion on the outer peripheral side due to the speed difference.

Further, the magnetic head slider support mechanism according to the present invention comprises a carriage that supports the magnetic head slider through the support portion and that rotates on the magnetic disk about the rotation center, and the carriage is the magnetic head slider. The magnetic head slider is supported through the supporting portion at a position where the rotational moment generated by the protrusion closer to the rotation center than the supporting portion of the slider and the rotational moment generated by the protrusion farther from the slider supporting the rotation center are equal. By balancing the shearing force generated in the sliding protrusion and the magnetic head element portion during the seek of the magnetic head slider, the behavior of the magnetic head slider is balanced by the shearing force even during the seek operation. Can be stable.

Therefore, according to the magnetic head slider and the magnetic head slider support mechanism of the present invention, the rotational moment in the in-plane direction of the magnetic disk due to the shearing force generated at the contact portion with the rotating magnetic disk is reduced, The behavior of the head slider can be stabilized, and good data recording / reproduction can be performed. Further, since the rotational moment in the in-plane direction of the magnetic disk is reduced even when the magnetic head slider seeks, the behavior of the magnetic head slider can be stabilized even when seeking. As a result, high density recording of the contact type magnetic disk device can be realized.

[Brief description of drawings]

1A and 1B are views for explaining a magnetic head slider according to a first embodiment of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a side view.

FIG. 2 is a perspective view of the magnetic head slider according to the first embodiment.

FIG. 3 is a diagram for explaining the principle of the present invention.

FIG. 4 is a plan view of a magnetic head slider according to a second embodiment of the present invention.

FIG. 5 is a plan view of a magnetic head slider according to a third embodiment of the present invention.

FIG. 6 is a diagram showing a magnetic disk device equipped with a magnetic head slider of the present invention.

FIG. 7 is a view for explaining the principle of the fourth embodiment of the present invention and a magnetic head slider.

8A and 8B are views for explaining a magnetic head slider according to a fifth embodiment of the present invention. FIG. 8A is a plan view, FIG. 8B is a side view, and FIG. 8C is a magnetic disk slider mounted on a magnetic disk. The figure is shown.

FIG. 9 is a plan view of a magnetic head slider according to a sixth embodiment of the present invention.

FIG. 10 is a plan view of a magnetic head slider according to a seventh embodiment of the present invention.

FIG. 11 is a perspective view of a magnetic head slider according to an eighth embodiment of the present invention.

FIG. 12 is a perspective view of a magnetic head slider according to a ninth embodiment of the present invention.

[Explanation of symbols]

10 ... Magnetic head slider, 11 ... Slider body, 12
... thin film element forming portion, 13 ... thin film element portion, 14 ... slider center of gravity, 14 '... slider center of gravity projection point, 21 ... (for sliding formed on slider body) inner peripheral projection, 21' ... (on slider body) Projected points of inner peripheral projections (for sliding formed), 2
2 ... (for sliding) formed on slider body, outer peripheral projection, 22 '... (for sliding formed on slider body) outer peripheral projection point, 23 ... magnetic head element projection, 23'
... Projection point of magnetic head element projection, 24 ... Magnetic head element projection, 25 ... (for sliding formed on thin film element forming portion) Outer projection, 26 ... (for sliding formed on slider body) center Projections 27, (for sliding formed on the slider body) inner circumference projections 28, 28 (for sliding formed on the slider body) inner circumference projections (large surface roughness), 30 ... Door, 31 ... Gimbal, 32 ... Pivot, 32 '
... Pivot projection point, 33 ... Road arm, 40 ... Carriage, 41 ... Carriage rotation center, 50 ... Magnetic disk, 51 ... Magnetic disk rotation center, 52 ... Spindle,
60 ... Magnetic disk device, 61 ... Base, 62 ... Cover.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuji Higashijima 2880 Kozu, Odawara, Kanagawa Stock Company Hitachi Storage Systems Division (72) Inventor Kazuo 2880, Kozu, Odawara, Kanagawa Hitachi Storage Co., Ltd. System Division (72) Inventor Hideki Sonobe 2880 Kozu, Odawara City, Kanagawa Stock Company Hitachi Storage Systems Division

Claims (6)

[Claims] 1. A magnetic head slider having a magnetic head element and a plurality of sliding projections arranged in the inner and outer circumferential directions of the magnetic disk centering on the magnetic head element, the slider being for sliding on the inner circumferential side. A magnetic head slider, wherein a contact area of the protrusion with the magnetic disk is made larger than a contact area of the protrusion on the outer peripheral side with the magnetic disk. 2. A magnetic head slider according to claim 1, wherein the contact area of the two sliding protrusions with the magnetic disk is made inversely proportional to the peripheral velocity of the magnetic disk with which each protrusion contacts. . 3. A magnetic head slider having a magnetic head element and two sliding projections arranged in the inner circumferential direction and the outer circumferential direction of the magnetic disk centering on the magnetic head element, wherein the two sliding projections are provided. The contact area with the magnetic disk is the same, and the distance between the magnetic head element and the inner peripheral sliding projection is offset so as to be larger than the distance between the magnetic head element and the outer peripheral sliding projection. A magnetic head slider characterized by the above. 4. A magnetic disk circumferential speed at which each of the sliding protrusions contacts the gap between the magnetic head element and the inner peripheral sliding protrusion and the gap between the magnetic head element and the outer peripheral sliding protrusion. 4. The magnetic head slider according to claim 3, wherein the magnetic head slider is inversely proportional to. 5. A magnetic head slider having a magnetic head element and two sliding protrusions arranged in the inner circumferential direction and the outer circumferential direction of the magnetic disk with the magnetic head element as a center, which is for sliding on the inner circumferential side. A magnetic head slider characterized in that the surface roughness of the contact portion of the protrusion with the magnetic disk is made larger than the surface roughness of the contact portion of the protrusion on the outer peripheral side with the magnetic disk. 6. A magnetic head element having a magnetic head element for recording / reproducing on / from a magnetic disk and a plurality of projections in contact with the magnetic disk, and a magnetic disk having the magnetic head slider supported by a supporting portion and having a center of rotation as a center. A magnetic head slider support mechanism including a carriage that rotates upward, wherein the carriage generates a rotation moment generated by a protrusion closer to the rotation center than a support portion of the magnetic head slider and the rotation center from the slider support portion. A magnetic head slider support mechanism characterized in that the magnetic head slider is supported via a support portion at a position where the rotational moment generated by a projection portion farther away is equal.