JPH0581998B2 - - Google Patents

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 relates to a flexible support device for an air bearing slider. .

[Conventional technology]

Magnetic disk devices, in which information is written on and reproduced from the surface of a rotating recording disk using a magnetic head, are particularly widespread among information storage devices. In this magnetic disk device, a head slider is supported for positioning a target track among tracks on which information is written concentrically on a recording disk surface and reading and writing data on that track. A head slider support device in which one end of a 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 distance, the head slider must be supported sufficiently elastically in the gap direction, pitting direction and rolling direction. However, on the other hand, the rigidity of the recording disk surface, the access direction of the head slider, and the yaw and ink direction of the head slider must be sufficiently high.

In order to meet such demands, head slider support devices disclosed in, for example, Japanese Patent Publication No. 58-22827, Japanese Patent Application Laid-open No. 51-39114, and Japanese Patent Application Laid-open No. 60-127578 have been used. There is.

[Problem that the invention seeks to solve]

However, with the recent rapid increase in the capacity of magnetic disk drives, there are growing demands for improved accuracy in holding the head on the recording disk track and for maintaining a stable distance between the head slider and the recording disk. Nevertheless, it is difficult for conventional head slider support devices to satisfy this requirement. Specifically, the head slider support device including the head slider vibrates due to complex vibrations of the recording disk or external excitation force (fluid force) such as wind generated as the recording disk rotates. When the rigid beam portion is configured as a bent structure of the head slider support arm as in the conventional head slider support device, the ratio of the fluid force to the rigidity there is large. Furthermore, since the rigid beam portion is a single member, almost no attenuation can be expected there. Therefore, the head slider vibrates greatly.

Therefore, it is difficult to achieve the above requirements with the conventional technology.

SUMMARY OF THE INVENTION An object of the present invention is to provide a head slider support device that can easily hold a head slider on a recording disk and maintain a stable distance between the head and the recording disk.

[Means for solving problems]

The above purpose is to replace the rigid beam portion of the head slider support arm with a triangular flat portion (hereinafter referred to as triangular flat portion) of the head slider support arm.
This can be achieved by combining a member (hereinafter referred to as a rigid member) with a protrusion having substantially the same shape as the triangular shape.

[Effect]

Among the rigid members, the protrusions play the role of increasing rigidity, but are shaped to reduce fluid force. Further, since the rigid member is coupled to the triangular flat portion of the head slider support arm, a friction damping effect can be obtained, and head slider vibration can be reduced.

Therefore, it is easy to maintain high precision in holding the head slider on the recording disk (hereinafter referred to as positioning accuracy), and it is also possible to maintain a stable distance between the head and the recording disk (hereinafter referred to as stable floating).

〔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, and in particular is a perspective view showing how the head slider support device flies above a rotating recording disk. The head slider 5 reads and writes information on a track 9 on the surface of a recording disk 8 rotating in the direction of arrow A. This head slider 5 is supported by a head slider support arm 1 via a flexible body 6. The base side of the head slider support arm 1 (the side opposite to the head slider mounting portion) is connected to a rigid arm 7. The rigid arm 7 is further attached to an actuation device (not shown).
The head slider 5 can perform an access movement to any track 9 on the surface of the recording disk 8 by means of the actuating device. Once the access operation is complete 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 head slider support arm 1 described above is composed of an elastic spring portion 2, a triangular flat portion 3, and a portion for attaching to the spacer 20 (a portion hidden by the spacer 20). The triangular flat part 3 cannot play a rigid role by itself, but a rigid member 30, which will be described in detail later, is connected to that part and acts rigidly, so the triangular flat part 3 and the rigid member 30 The part made up of these is called a rigid beam part.

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 flying height above the recording disk 8. In other words, the head slider 5
In the 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 aforementioned flexible body 6 is fixedly attached to the head slider support arm 1 by a coupling means such as welding, and furthermore, it holds the head slider 5. The 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 through the pivot apex.
That is, the head slider 5 is a pivotally supported air bearing. The flexible body 6 rotates the head slider 5 in the pitching direction (rotation around the radial axis of the recording disk 8 in FIG. 1) and rolling direction (the circumferential direction of the recording disk 8 in FIG. 1) of the head slider 5 about the pivot top. It is extremely flexible with respect to movement (rotation around an axis),
It has a characteristic of sufficiently following the waviness of the recording disk 8. Furthermore, the flexible body 6 also has the role of insulating external vibrations that attempt to be transmitted from the head support arm 1 to the head slider 5.

The head slider support arm 1 is attached to the rigid arm 7 via a spacer 20. Mounting part of head slider support arm 1 and spacer 20
are connected in advance by means of joining such as welding or caulking. Head slider support arm 1
A hole 23 is pre-drilled in the spacer 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 a screw 21 via a spacer 20, thereby forming a head slider support device.

As mentioned above, the feature of this embodiment is that the rigid member 30, which has almost the same shape as the triangular flat part 3 and is composed of the protrusion 31 and the thin plate flat part 32, is coupled to the triangular flat part 3. It is in. The connecting means includes, for example, a weld 33 on the rigid projection 31.

Although the cross-sectional shape of the protrusion 31 in the width direction is not particularly limited, the relationship between the shape and the characteristics of the head slider support device will be explained using an example in which the shape is approximately rectangular as shown in FIG. do. The degree of rigidity of the protrusion 31 that plays a rigid role is determined by the longitudinal elastic modulus E
It can be expressed as the product of the moment of inertia Iz and the bending stiffness EIz. Here, the materials are the same (E
= constant), the relationship between the width b' and the height h of the protrusion 31 is determined such that Iz is constant. When such a rigid member is placed in a uniform fluid (velocity v, density), the fluid force F it receives is F=C _D (1/2v ² S)...(1) Here, C _D is the drag coefficient, and S is the projected area of the member on a plane perpendicular to the flow. When estimating the fluid force F that is applied to the rigid member 30 having the shape shown in FIG.
Ignoring the space above the thin plate flat portion 32, the rigid member 30 is replaced with a prism having a width b and a height h. In such a case, the fluid force applied to the rigid member is constant, v is constant, and the length of the rigid member (length in the direction of the paper in Figure 2) is constant, the resistance coefficient C _D
It can be estimated by multiplying by the height h.

_C
As shown in the figure. It can be seen that the magnitude of C _D ·h decreases as the width b' increases. Tokuko Showa 58-22827
In the head slider support device disclosed in , the flange configured as a bending structure of the head slider support arm corresponds to the protrusion in the present invention, and in such a configuration, the size of the width b' cannot be arbitrarily selected. Furthermore, since b' is generally small, the value of C _D ·h becomes large. That is,
In the conventional head slider support device, the fluid force is large and this becomes an excitation force, resulting in large head slider vibrations. However, on the other hand, even if b' is made too large, C _D ·h does not decrease very much. Moreover, the weight of the rigid member 30 increases, which is not favorable in terms of performance. That is, the thin flat portion 32
By providing a space in the upper part of the member, it is possible to obtain a rigid member with small fluid force without increasing the weight too much.

In summary, in the present invention, the rigidity of the rigid beam portion is the same as that of the conventional head slider support device, and the fluid force is sufficiently reduced.

This effect was confirmed through experiments. FIG. 4 shows a comparison of head slider vibration (yawing vibration and pitching vibration of the head slider) between the head slider support device according to the present invention and the conventional one. Note that the vertical axis in the figure is displayed at the same level for both the present invention and the conventional example. As can be seen from the figure, in the present invention, since the fluid force is small, it is clear that the head slider vibration is small.

FIG. 5 shows a second embodiment according to the invention. Here, the protrusion has a substantially streamlined shape, and its resistance coefficient is very small. Therefore,
In this embodiment as well, since the fluid force is small, a head slider support device capable of highly accurate positioning and stable floating can be realized. The protrusions include the semicircular shape shown in Fig. 1, the rectangular shape shown in Fig. 2, and the streamlined shape shown here, but the present invention does not specifically define these shapes; It may be determined in relation to the method, etc.

FIG. 6 shows a third embodiment of the present invention.
Here, the thin plate flat part 32 of the rigid member 30 is provided with at least one new joint part, such as a weld part 34, for joining with the triangular flat part 3.
Note that the other configurations are the same as the first embodiment shown in FIG. When there is no welding point 34 mentioned above (Fig. 1)
In this case, the contact state between the thin plate flat portion 32 and the triangular flat portion 3 is unclear (they may not contact each other due to manufacturing errors), and therefore sufficient damping due to friction cannot be obtained there. In this embodiment, the contact state is made clear by providing a welded portion 34. the result,
Since the head slider support device functions as a damping structure in addition to the structure of FIG. 1 with a small fluid force, it is possible to greatly reduce head slider vibration. In addition, it is disclosed in Kyoto University Disaster Prevention Research Institute Annual Report No. 17A (Showa 49.4) that copper's attenuation rate of 0.05 to 0.1% can be reduced to about 0.5% by using a welded structure.

FIG. 7 shows a fourth embodiment according to the invention. As mentioned above, if the thin plate flat portion 32 and the triangular flat portion 3 are in reliable contact, frictional damping will work there. Therefore, here, the thin plate flat part 32 is shaped to be slightly convex toward the triangular flat part 3, so that when the thin plate flat part 32 and the triangular flat part 3 are combined, the structure is such that they can be brought into close contact with each other. In FIG. 8 (fifth embodiment), a viscoelastic body 40 is provided as a new member between the two, thereby obtaining a damping effect. Further, in FIG. 9 (sixth embodiment), a lead wire 5 is connected between the thin plate flat part 32 and the rigid beam part 3.
0 (wire for reading and writing information on the magnetic head) is sandwiched in a sanderch, and the damping effect is obtained from the friction there.

In each of these embodiments, since frictional damping works, a low-vibration head slider support device can be realized.

Although the rigid member and the triangular flat portion have been connected by welding so far, any strong connection means such as adhesion, rivets, or diffusion bonding may be used. Furthermore, taking advantage of the fact that the rigid member is a separate member from the head slider support arm, the rigid member may be made of a different material, such as a ceramic tube that is lightweight and highly rigid.

〔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 an assembled perspective view illustrating a first embodiment of the head slider support device of the present invention, FIG. 2 is a sectional view in the width direction of the rigid member, and FIG. 3 is a diagram showing the relationship between the width of the protrusion and the fluid force. FIG. 4 is a diagram for explaining the relationship between the head slider vibration of the present invention and a conventional example. FIG. 5 is an assembled sectional view in the width direction showing the second embodiment of the present invention. The figure is an assembled perspective view showing a third embodiment of the present invention, FIG. 7 is an assembled cross-sectional view in the width direction showing a fourth embodiment of the present invention, and FIGS. FIG. 6 is a cross-sectional view in the width direction showing a sixth embodiment. DESCRIPTION OF SYMBOLS 1... Head slider support arm, 2... Elastic spring part, 3... Triangular flat part, 5... Head slider, 6... Flexible body, 7... Rigid arm, 8... Recording disk, 9... Track, 30...Rigid member, 31...Protrusion, 32...Thin plate flat portion, 3
3, 34... Welded part, 40... Viscoelastic body, 50...
…Lead.

Claims (1)

[Scope of 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 has an elastic spring portion on the rigid arm side. In the head slider support device, the rigid beam portion extends from the elastic spring portion toward the head slider, the rigid beam portion includes a triangular flat portion extending from the elastic spring portion, and a triangular flat portion extending from the elastic spring portion. 1. A head slider support device comprising a rigid member having a protrusion and a thin plate flat portion having substantially the same shape as the head slider supporting device, the flat portion and the rigid member being connected. 2. The head slider support device according to claim 1, wherein a connecting portion between the triangular flat portion and the rigid member is provided on the protrusion. 3. The head slider according to claim 1, characterized in that a connecting portion between the triangular flat portion and the rigid member is provided on the protrusion and at least one portion is also provided on the thin plate flat portion. Support device. 4. The head slider support device according to claim 2 or 3, wherein the connecting means at the connecting portion is welding. 5. The head slider support device according to claim 2 or 3, wherein the bonding means in the bonding portion is a bonding agent. 6. The head slider support device according to claim 2 or 3, wherein the coupling means in the coupling portion is diffusion bonding. 7. The head slider support device according to claim 1, wherein the cross-sectional shape in the width direction of the protrusion of the rigid member is approximately semicircular. 8. The head slider support device according to claim 1, wherein the cross-sectional shape in the width direction of the protrusion of the rigid member is approximately rectangular. 9. The head slider support device according to claim 1, wherein the protrusion of the rigid member has a cross-sectional shape in the width direction that is generally streamlined. 10 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 has an elastic spring portion on the rigid arm side, and In a head slider support device in which a rigid beam portion extends from a spring portion toward a head slider side, the rigid beam portion has a triangular flat portion extending from an elastic spring portion and a shape substantially the same as the triangular shape. A head slider support device comprising a rigid member having a thin plate flat portion of a protrusion, and a viscous material sandwiched between the two. 11 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 has an elastic spring portion on the rigid arm side, and the In a head slider support device in which a rigid beam portion extends from a spring portion toward a head slider side, the rigid beam portion has a triangular flat portion extending from an elastic spring portion and a shape substantially the same as the triangular shape. 1. A head slider support device comprising: a rigid member having a protrusion and a thin plate flat portion; and a lead wire sandwiched between the two.