JPS62256279A - Head slider supporting device - Google Patents

Abstract

PURPOSE:To stably keep an interval between a head and a recording disk by providing a link between a head slider supporting mechanism and a rigid arm to a position where the rate of change of the rigidity of the link is constant with respect to a distance from each boundary line. CONSTITUTION:The head slider supporting mechanism 16 supports the head slider 5 of a magnetic disk 8. Further, the link 13 is provided near both ends of the boundary line at the slider side of the rigid arm 7 with the mechanism 16 and coupled with the mechanism 16 and the arm 7. That is, the mechanism 16 and the arm 7 are allowed to contact with a fitting part 10 and the link 13 is provided within a range where the rate of change of the rigidity of the link 13 is constant with respect to the distance from the boundary line between the arm 7 and the mechanism 16. Thus, the torsional vibration of the mechanism 16 is suppressed smaller and the play between the mechanism 16 and the arm 7 is decreased. Thus, the highly accurate positioning and stable support (stable floating) of the slider 5 are facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a support device for a head slider used for recording and reproduction in a magnetic storage device, and particularly to a support device for an air bearing slider.

[Conventional technology]

2. Description of the Related Art Magnetic disk drives, in which information is written on and reproduced from the surface of a recording disk rotated by a magnetic head, are particularly widespread among information storage devices. In this magnetic disk device, a head is supported by a head slider in order to position the head at a target track among the tracks on which information is written concentrically on the same surface of the recording disk, and to read and write data on that track. A head slider support device in which one end of the slider support mechanism is supported by a rigid arm in a cantilevered manner is well known. It is also well known that when the recording disk rotates with the head slider pressed against the recording disk, the head slider flies above the recording disk surface with a flying height in the submicron range of 0.5 μm or less. Therefore, in order for the head slider to closely follow the recording disk surface at a constant interval,
The head slider must be supported sufficiently elastically in the gap direction, pitching direction, and rolling direction. However, on the other hand, the rigidity in the access direction of the head slider in the traveling direction of the disk surface and in the yawing direction of the head slider must be sufficiently high.

In order to meet such demands, conventionally, for example,
There is a head slider support device described in Japanese Patent No.-22296.

[Problem that the invention seeks to solve]

However, with the recent rapid increase in the capacity of magnetic disk drives, the requirements for maintaining the precision of holding the head on the track of the recording disk and for stably maintaining the distance between the head slider and the recording disk have become stricter. Nevertheless, it is difficult for conventional head slider support devices to satisfy this requirement. Specifically, a head slider support device including a head slider vibrates due to complex vibrations of the recording disk or external excitation forces such as wind generated as the recording disk rotates. If the head slider support mechanism is connected to the rigid arm by means of screwing, welding, welding, etc. only in the central area of the area where the head slider support mechanism contacts and is fixed, the head slider support mechanism may be twisted. The vibration of the head slider cannot be suppressed sufficiently, and the vibration of the head slider becomes large.Furthermore, because the torsional vibration is large, the attachment part of the head slider support arm fluctuates with the rigid arm, and the magnitude of the vibration of the head slider also increases with respect to each head. This will vary greatly depending on the slider support device.

Therefore, it is difficult to achieve the above requirements with the prior art.

An object of the present invention is to provide a head slider support device that can easily position a head slider on a recording disk with high precision and maintain a stable distance between the head and the recording disk.

[1? +'Means for Solving Problem 1] In order to achieve the above-mentioned object, the present invention provides a coupling portion for coupling a head slider support mechanism that holds a head slider of a recording disk to a rigid arm, by connecting the coupling portion to the rigid arm. The mounting portions are provided near both ends of the boundary line of the rigid arm on the head slider side. Specifically, the mounting part of the head slider support arm is in contact with the rigid arm at the mounting part, and the distance between the connecting part and the boundary line between the rigid arm and the head slider support mechanism is This means that the stiffness of the joint should be set within a range until the rate of change in stiffness of the joint becomes constant.

[For production]

This coupling means can suppress the torsional vibration of the head slider support mechanism, and the attachment portion of the head slider support arm is less likely to fluctuate with respect to the rigid arm. Thereby, the vibration of the head slider can also be reduced without variation.

Furthermore, with this coupling means, the dynamic bending rigidity of the head slider support device does not increase much, and the followability of the head slider to the recording disk surface does not deteriorate.

Therefore, it is easy to maintain high accuracy in holding the head slider on the recording disk (hereinafter referred to as ``positioning accuracy''), and also maintain a stable distance between the head and the recording disk (hereinafter referred to as ``stable floating''). ) can also be fully achieved.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a head slider support device according to an embodiment of the present invention, in which a head slider support mechanism 16 is fixed to a rigid arm 7 and the head slider support device floats above a rotating recording disk. FIG. The head slider 5 has a recording disk 8 rotating in the direction of the arrow hole.
Information is read and written to the l-rack 9 on the front surface. This head slider 5 is supported by a head slider support arm 1 via a flexible body 6. Head slider support arm 1
The base side (the side opposite to the head slider attachment part) is connected to the rigid arm 7. The rigid arm 7 is further attached to an actuator (not shown). The head slider 5 can access any track 9 on the surface of the recording disk 8 by the actuating device. When the access operation is completed and the head slider 5 is on the target track 9, a closed loop servo system or the like is used to accurately position the head slider 5 on the target track 9.

The aforementioned head slider support arm 1 includes an elastic spring portion 2,
Triangular elongated flat part 3, flange 4° rigid arm 7
It is constituted by an attachment part 10 to.

The elastic spring portion 2 has two major functions. One of them is to apply a load necessary for the head slider 5 to fly a predetermined amount above the recording disk 8.

That is, when the head slider 5 is in a floating state, the load by the elastic spring section 2 acts against the air supporting force supplied by the air flow between the head slider 5 and the recording disk 8. Another is that while stably supporting the head slider 5, the vertical movement of the head slider 5 is not restricted in order to sufficiently follow the surface runout of the recording disk 8, etc. The flange 4 is constructed as a bent structure of a part of the flat part 3, and the head slider support arm 1
plays the role of increasing rigidity.

The flexible body 6 described above is fixedly attached to the head slider support arm 1 by a coupling means 11 such as welding, and further includes:
It holds the head slider 5. These slider support arm 1, flexible body 6, and head slider 5 constitute a head slider support mechanism 16. The aforementioned flexible body 6 has a pivot portion (not shown), and the load from the elastic spring portion 2 is transmitted to the head slider 5 via the pivot top (apex). That is, the head slider 5 is a pivot-supported air bearing. The flexible body 6 is an enlarged view of one side of the pitching direction of the head slider 5 (FIG. 2 is the joint in FIG. 1) 3 centered on the top of the pivot.The rigidity of the head slider support arm 1 The attachment portion 10 to the arm 7, that is, the contact area is indicated by diagonal lines.Also, the boundaries 14.a, 14.of the attachment portion 10 of the head slider support mechanism 16 are shown.
The contact area b is also referred to as the root corner. ) to the joint 13
This is the shortest distance in the width and length directions.

In what position the coupling portion 13 should be provided on the shaft to suppress vibration of the head slider will be explained.

It is well known that the head slider support device shown in Figure 1 has complex natural vibration modes, and the natural vibration modes of the device shown here include torsional vibration mode and bending vibration mode. .

Figure 3 shows the torsional vibration mode. The solid line shows the shape of the head slider support device after it vibrates and fluctuates.
It can be seen that the head slider support arm 1 is significantly twisted. With this torsional movement, the base corner of the head slider support arm 1 is swung up and down.
The amount of deflection there is the maximum value among the amounts of deflection at each point on the boundary line. Therefore, it can be seen that coupling the head slider support arm 1 to the rigid arm 7 at the root corner is the most effective means for reducing torsional vibration.

However, if the spot welding at the joint 13 is very close to both ends of the boundary line, it is necessary to consider the effect on the rigidity of spot welding at the ends. When considering the strength of welding the head slider support arm 1 and the rigid arm 7 to the socket 1, when the head slider support mechanism undergoes torsional vibration, a tensile or compressive force as shown in Fig. 4 is applied to the spot weld. Considering that F acts and that the rigid arm 7 is sufficiently thick compared to the thickness of the head slider support arm 1, when a concentrated load is applied to the surface of the two-layer elastic body as shown in FIG. It would be a good idea to think about the problem. Since the load shown in FIG. 5 is negligible for the cloth, we will consider the model shown in FIG. 6 in which a concentrated load P acts on a two-dimensional elastic body.

In Figure 6, the stress at point C is σα=Trα=
It is given by ○. The isovalue line of σr is a set of circles as shown in FIG. The isovalue line (isovalue circle) of σr shown in Figure 7 is
When there is no boundary effect, the stress distribution is as shown in FIG. 8, but when there is a boundary effect, it is necessary to consider the stress missing portions as shown in FIG. 9. As can be seen from Figure 8, when the elastic body is infinitely spread out, the stress is distributed axially symmetrically around the point of load application, but as shown in Figure 9, there is a boundary 45 in the elastic body. When the point of load application is near this point, an insubstantial part (indicated by the dotted line in Figure 9) that receives the stress is created.As a result, the stress shown by the dotted line is borne by the elastic body. Therefore, the deformation of the elastic body as shown in FIG.
The deformation in the figure is larger. That is, when a load acts near the boundary, the rigidity decreases compared to when there is no boundary. This means that stiffness is closely related to stress distribution, and the rate of change in stiffness will be expressed using the following index.

Now consider a two-dimensional elastic body divided into three regions as shown in FIG. Applying this to the head slider support device of the present invention, the region 51- is the attachment part of the head slider support arm 1"-0, the region 53 is the rigid arm 7, and the point 54 where the concentrated load P is applied is the joint part 13. becomes. Area 5
2 is separated by a boundary 60 from the area 51, and the area 51
It is an extension of the space.

Let Qc be the arc length of each isocircle of stress σr in the regions 51 and 52, and let K be the sum of the products of nc and stress σr, then K is as follows: K=Σ(σr Q c)j... It can be expressed as (2). However, j indicates the number of an arbitrary equivalence circle.

Next, consider the area 51 in the same way, and if the arc length of each isocircle of stress σr in area 51 is Qc', then the product of stress σr and Qc' is K' = Σ(ar
Qc')i''・(3)]

That is, K' is nothing but the sum of the products of σr of the region 52 and the length of the arc of each isovalue circle of the stress σr in that region from K.

Then, the value obtained by dividing this value by K is used as an index representing the change in rigidity due to the boundary.

If you do not receive it, it becomes ni' =, so it becomes 廿廿=. If the force applied to the joint portion of the seat is applied to the boundary "-" (Q=0 in FIG. 10), then M=o, 5. In this way, it is possible to express the rate of change in rigidity with respect to the distance from the boundary line using an index called crystal.

Also, the value of K given by equation (2) is here σr=
10P, 7P, 5P, 3P, 2P, 1.5P, IP, 0
．． 7P, 0.5P, 0.3P, 0.2PO, 1,5P,
0. Let's find the support device for the 13 stress circles of IP. The stiffness versus distance of Qy shown in FIG. 2 can be considered in the form shown in FIG.

Further, since the rigid arm 7 does not exist under the head slider support arm 1 on the head slider side with respect to the boundary line 14b, it can be considered that almost no force flows there. Therefore, the stiffness with respect to the distance Qy can be considered as shown in FIG. 12.

As is clear from Figures 11 and 12, approximately ΩχtQY
It can be seen that when the value n is larger than 0.6 mm, the rate of change in rigidity of the camphor wheel becomes constant. Further, Figs. 13 and 14 show changes in the value for one fish, and Fig. 13 shows the rate of change of yo with respect to Qy, and Fig. 14 shows the rate of change of one book with respect to Qy. From these figures, the behavior in which 4 is constant as described above can be understood more clearly.

If there is no boundary effect, in other words: 1.
)value. 9. □Sect 4. If it is a constant value of □6°, the relationship between Q and the vibration level of the head slider should be almost proportional. That is, this is the relationship shown by the solid line in FIG.

However, as shown in Figures 1-3 and 14, the rate of change of 4 is a constant value.

In a range where the rigidity is lower than that shown by the solid line, the vibration level becomes larger than the value shown by the solid line, and the proportional relationship no longer holds true, as shown by the dotted line. Therefore, Ω0 from the boundary line. By coupling up to Q2, the vibration level of the head slider can be suppressed.

Next, FIGS. 17 and 18 show verification data regarding the head slider support device shown in FIG. 1, which is an embodiment of the present invention.
As shown in the figure.

In FIG. 16, boundary lines 14a, 14. intersection point 15 of b
A parameter in which r is the distance from, that is, the radius, is adopted. FIGS. 17 and 18 show the relationship between radius r and head slider vibration. FIG. 17 shows how far the head slider 5 deviates from the track 9 on the surface of the recording disk 8, and FIG. 18 shows the amount of variation in the flying height of the head slider 5 with respect to the radius r. In other words, each circle in FIG. 17 indicates the amount of positional deviation of the head slider in each head slider support device. In the figure, it can be seen that as the radius r becomes smaller, the amount of positional deviation of the head slider becomes smaller, and the variation thereof also becomes very small. As shown in dotted lines B and C, which connect the maximum or minimum value of each data of positional deviation amount at each radius as a smooth curve, radius 0
．． It can be seen that in the range of 6nwn or less, the change in the amount of positional deviation of the head slider with respect to the change in radius r suddenly becomes small. That is, the amount of head slider positional deviation does not change significantly within a radius of 0.6 mm or less. Similarly, FIG. 18 shows the amount of variation in the flying height of the head slider with respect to the radius r, and it can be seen that this also shows almost the same tendency as the characteristics of the amount of positional deviation of the head slider.

From this experimental data and Figs. 11 and 12, the period until the rate of change in stiffness becomes constant is 0≦Ωχ≦0.6 (n
By providing the coupling portion 13 in a range that satisfies the following (un) 0≦fly≦0.6 (mm), highly accurate positioning and stable flying of the head slider can be easily performed.

Next, another embodiment of the head slider support device is shown in FIG. 19. In this embodiment, the head slider support arm 1 is attached to the rigid arm 7 via a reinforcing plate 20. The mounting portion 10 of the head slider support arm 1 and the reinforcing plate 20 are connected by a previously provided connecting means 12 such as welding or caulking, and a newly provided welded portion 13 at the base corner of the head slider support arm. There is. A hole 23 is previously formed in the head slider support arm 1 and the reinforcing plate 20. The rigid arm 7 has a screw hole 22 corresponding to the hole 23. The head slider support arm 1 is fixed to the rigid arm 7 with screws 21 via a reinforcing plate 20, thereby forming a head slider support device. Note that the configuration is the same as that shown in FIG. 1 except for the double configuration. In this embodiment, the root corner of the head slider support arm 1 is firmly fixed to the reinforcing plate 20 having sufficient rigidity by spot welding, so that high positioning accuracy can be achieved as in the embodiment shown in FIG. This has the effect of making stable levitation easier.

20 and 21 show still another embodiment of the present invention, with FIG. 20 showing a side view and FIG. 21 showing a plan view. The head slider support mechanism 31 includes a spring member 33 having an elastic spring portion 32, a pressure plate 34, a flexible body 36, and a head slider 35. The head slider support mechanism 31 is attached to a rigid arm 37 via a reinforcing plate 41 by a coupling means 42 such as welding, and these constitute a head slider support device. The aforementioned flexible body 36
is composed of a gimbal portion 36C that holds the head slider 35 and gimbal support arms 36a and 36b, and has a flexible structure that does not restrict the pitching and rolling movements of the head slider 35. The spring member 33 having the elastic spring portion 32 is molded integrally with the flexible body 36, but its main role is to connect the spring member 33 and the pressure plate 34 connected to it by a connecting means 38 such as welding. A load is applied to the head slider 35 by a load arm 39 constituted by both. At the mounting portion 40 of the head slider support mechanism 31, the l\rad rider support mechanism 3] and the reinforcing plate 41 are fixed by a coupling means 42 such as welding. The feature of this embodiment is that, like the embodiments described above, welded portions 43 are provided near both ends of the boundary line 44, that is, at the root corner of the load arm 39. If such a means is provided, the vibration of the load arm 39 can be suppressed to a small level, so that a low-vibration head slider support device can be realized as in the previous embodiment.

It should be noted that the head slider support device may have a shape different from that of the embodiments described above as long as it has a structure in which the root corner of the present invention is firmly fixed by the coupling means. Further, in this embodiment, the coupling means of the coupling portion 13 is spot welding, but any means capable of firmly coupling the head slider support mechanism 16 and the rigid arm 7, such as a bonding agent, a rivet, or caulking, may be used.

〔Effect of the invention〕

According to the present invention, highly accurate positioning and stable floating of the head slider can be easily performed.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the head slider support device of the present invention, and FIG. 2 is an enlarged view of the main part of FIG. Figure 3 is a mode diagram showing torsional vibration of the head slider support device, Figure 4 is a diagram showing how force is applied to the joint, Figure 5 is a model of Figure 4, and Figure 6 is A diagram showing how a concentrated load P acts on a two-dimensional elastic body. Figures 7, 8, 9, and 10 are diagrams showing stress isovalue lines. Figure 11
Figure 12 is a diagram showing changes in rigidity in an example of the present invention, Figure 13 is a diagram showing the differentiation of the values shown in Figure 11, and Figure 14 is a diagram showing the values shown in Figure 12. Fig. 15 is a diagram showing the relationship between the distance from the boundary line to the joint and the vibration level, Fig. 16 is an enlarged view of the main part of Fig. 1, and Fig. 17 18 is a diagram showing the relationship between the attachment position of the head slider support arm and the position where it is connected to the rigid arm and the amount of positional deviation of the head slider. Figures 1-9 are assembled perspective views illustrating the second embodiment of the present invention, and Figures 20 and 21 are diagrams illustrating the third embodiment of the present invention. In the drawings, FIG. 20 is a side view, and FIG. 21 is a plan view. [Explanation of symbols] 1...Head slider support arm, 2, 32...Elastic spring portion, 5, 35...Head slider, 6 .36...
・Flexible body, 7, 37... Rigid arm, 8... Recording disk, 10, 40... Mounting part], 3, 4.3-
・-Welding part, 14a, 14b, 44... Boundary line, 16
．． 31... Head slider support mechanism, 33... Spring member, 34... J+tj pressure plate, 39... Load arm

Claims (1)

[Claims] 1. The head slider support mechanism includes a head slider support mechanism that holds a head slider, and a rigid arm that supports the head slider support mechanism in a cantilever shape, and the head slider support mechanism is fixed to the rigid arm. In the head slider support device, the attachment portion of the head slider support mechanism has an elastic spring portion on the attachment portion and the rigid arm side, and the attachment portion of the head slider support mechanism overlaps the rigid arm, the attachment portion on the attachment portion of the head slider support mechanism. If the distance from the boundary line of the side part of is lx, and the distance from the boundary line of the head slider side of the attachment part is ly, then the connecting part of the head slider support mechanism and the rigid arm is and the distance lx from each boundary line
, ly, the head slider support device is provided between points l_1 and l_2 at which the rate of change in rigidity of the joint portion with respect to ly becomes constant. 2. The head slider support device according to claim 1, wherein the means for connecting the head slider support mechanism and the rigid arm at the connecting portion is welding. 3. The head slider support device according to claim 1, wherein the means for connecting the head slider support mechanism and the rigid arm in the connecting portion is a binding agent. 4. The head slider support device according to claim 2, wherein the welding as the coupling means is spot welding. 5. The head slider support device according to claim 1, wherein the head slider support mechanism and the steel arm are connected via a reinforcing plate. 6. The head slider support device according to claim 1, wherein the mounting portion is a contact area between the head slider support mechanism and the rigid arm. 7. The head slider support mechanism includes a head slider support mechanism that holds a head slider, and a rigid arm that supports the head slider in a cantilever shape, and the head slider support mechanism has a mounting part that is fixed to the rigid arm and an elastic spring part. A head slider support device comprising a head slider support arm and a flexible body attached to a distal end of the head slider support arm to hold the head slider, the attachment portion of the head slider support arm overlapping the rigid arm. , the distance on the mounting portion of the head slider support mechanism from the boundary line of the side of the mounting portion is lx,
When the distance from the boundary line on the head slider side of the mounting portion is ly, the distance lx from the boundary line of the coupling portion of the head slider support mechanism and the rigid arm to each boundary line, and the distance lx from the boundary line to ly are A head slider support device characterized in that it is provided between points l_1 and l_2 at which the rate of change in rigidity of the joint portion is constant. 8. The head slider support device according to claim 7, wherein the means for connecting the head slider support mechanism and the rigid arm at the connecting portion is welding. 9. The head slider support device according to claim 7, wherein the means for coupling the head slider support mechanism and the rigid arm in the coupling portion is a bonding agent. 10. The head slider support device according to claim 7, wherein the welding as the coupling means is spot welding. 11. The head slider support device according to claim 7, wherein the head slider support mechanism and the rigid arm are coupled via a reinforcing plate. 12. The head slider support device according to claim 7, wherein the mounting portion is a contact area between the head slider support mechanism and the rigid arm. 13. A head slider including a head slider support mechanism that holds a head slider and a rigid arm that supports the head slider in a cantilever shape, the head slider support mechanism having a mounting part that is fixed to the rigid arm and an elastic spring part. In the head slider support device, the head slider support device includes a support arm and a flexible body that is attached to a distal end of the head slider support arm and holds the head slider, and a mounting portion of the head slider support arm overlaps the rigid arm. The connecting portion of the head slider support mechanism and the rigid arm is located on the attachment portion of the head slider support mechanism at a point that is 0.6 mm from the side border of the attachment portion, and the boundary line of the attachment portion on the head slider side. A head slider support device characterized in that it is provided between 0.6 mm and 0.6 mm. 14. A head slider support mechanism that holds a head slider; and a rigid arm that supports the head slider support mechanism in a cantilever shape; The head slider support mechanism includes a mounting portion that is fixed to the rigid arm; It consists of a load arm having an elastic spring part on the arm side, and a flexible body located outside the load arm and supporting a head slider, and the mounting part of the head slider support mechanism is attached to the head which overlaps with the rigid arm. In the slider support device, a distance from a border on the mounting portion of the head slider support mechanism that is continuous with the elastic spring portion at a side of the mounting portion is lx, and a boundary line between the mounting portion and the elastic spring portion. When the distance from the head slider support mechanism and the rigid arm is ly, the rate of change in the rigidity of the joint between the boundary line and the distance lx from the boundary line is constant. A head slider support device characterized in that it is provided between points l_1 and l_2. 15. The head slider support device according to claim 14, wherein the means for connecting the head slider support mechanism and the rigid arm at the connecting portion is welding. 16. The head slider support device according to claim 14, wherein the means for coupling the head slider support mechanism and the rigid arm in the coupling portion is a bonding agent. 17. The head slider support device according to claim 14, wherein the welding as the coupling means is spot welding. 18. The head slider support device according to claim 14, wherein the head slider support mechanism and the rigid arm are coupled via a reinforcing plate. 19. The head slider support device according to claim 14, wherein the mounting portion is a contact area between the head slider support mechanism and the rigid arm.