JPS637574A - Floating head supporter - Google Patents

Abstract

PURPOSE:To obtain a small floating head supporter of the lowest amount of floating at the time of seeking by substantially forming a slider attaching part and a flexible finger part on the same plane. CONSTITUTION:A flexible structure supporting member 4 is composed of a rectangular shape thin metal plate and a center is punched to an U-shape and a space 13 is formed. On the lateral frame 16 of the flexible structure supporting member 4, the disk slider attaching part 18 is extended on the same plane as the flexible structure supporting member 4. The center part of the slider attaching part 18 is recessed upward and swelled to form a protrusion for a load and the slider attaching part 18 is supported by two flexible finger parts 15 through the lateral frame 16. Thereby, sinking in the slider at the time of seeking is reduced, the possibility in the contact of the slider and a memory medium is reduced and a memory device of high reliability can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floating head support device for a rotary storage device,
In particular, the present invention relates to a floating head support device suitable for high-density storage devices in which the flying height of the floating head is small and the seek speed is high.

[Conventional technology]

Rotary storage devices are generally disclosed in Japanese Patent Application Laid-Open No. 55-8692, for example.
As described in the above publication, an air bearing slider (floating head) equipped with a transducer that writes information to and reads information from a rotating storage medium.

It includes a support device that supports the air bearing slider, and an access device that accesses the air bearing slider to any desired location on the storage medium (a radial position of the rotating storage medium) and holds the air bearing slider at that location.

Conventionally, as the above-mentioned support device, one having a structure as shown in FIG. 18 has been used. The slider mounting portion 18 shown in FIG. 18 has a U-shaped cutout in the center of a flat metal plate to form a tongue, and the air bearing slide 3 is attached to the lower surface of the tongue using an adhesive 19. There is. The tip of the slider mounting portion 18 is bent upward, and the upper end of the bent portion 17 is fixed to the flexible structure support 4. Then, the protrusion 12 formed by expanding the center of the tongue portion upward is pressed downward by the flexible structure support 4, thereby urging the air bearing slider 3 in the direction of the rotary storage medium 1. Furthermore, 1
1 is the floating surface of the air bearing slider 3.

In addition, as related to the conventional floating head support device,
For example, Japanese Patent Publication No. 58-22827 can be mentioned.

[Problem that the invention seeks to solve]

When seeking to access an arbitrary radial position of the rotating storage medium by the air bearing slider, a radial driving force is applied from the accessing device to the supporting device, and the driving force accelerates, maintains a constant velocity, and decelerates the supporting device. In the conventional support device shown in FIG.

As will be described next, when a driving force is applied, the air bearing slider 3 rolls, resulting in a reduction in the flying height.

When a force F in the theta direction is transmitted to the air bearing slider 3 from the flexible structural support 4 through the mounting portion 18 and the adhesive layer 19, this force moves the air bearing slider 3 toward its center of gravity M.
Try to rotate it around. The moment Mm is the arm length Ql, so Mm = F n 1
−(1). Mm is the restoring moment M r = k i (
2). k is a restoring spring constant.

Here, Δh=I2zi...
(3) F=mα... From (4),
Δh = Q x Q 1
...It is expressed as (5). m is the mass of the air bearing slider, and α is the seek acceleration.

In order to confirm the correctness of the above idea, we developed a means to measure the temporal change in the flying height of the air bearing surface 11.
When Δh during seek of the support device at Q1 and Ql was leaked, it was found that the actually measured Δh was much larger than the equation (5).

That is, if L is the distance from the point of application of the substantial theta direction force F to the center of gravity M, and Δh is expressed as Δh=QzL (6), then L > 11 t (7). found. In other words, in the conventional support device, the point of action of the substantial theta direction force on the air bearing slider 3 is located farther from the center of gravity M, resulting in a significant reduction in the flying height.

Conventionally, there was no means to accurately measure temporal changes in the flying height at high speed, or to detect rolling motion of the air bearing slider by simultaneously measuring temporal changes in the flying height of the left and right flying surfaces of the air bearing slider. , sufficient consideration was not given to the above phenomenon.

In addition, what we mean by high-speed and precise measurement of changes in flying height is:
For example, if a change in flying height of about 0.01 μm that occurs within 0.5 ms is
It refers to measurement with a resolution of μm or higher.

The second reason why consideration has not been given to the minimum reduction in flying height during seek is that the flying height is still sufficiently large compared to the estimated reduction amount during seek. In other words, while the conventional flying height was 0.4 to 1 .mu.m, the reduction in flying height was thought to be 0.01 to 0.03 .mu.m, so it was not considered to be a serious cause of failure.

However, recently, as storage density has increased, it has become necessary to reduce the flying height to 0.2 μm to 0.3 μm6.In addition, seek acceleration has been increased to shorten access time. As a result, it is expected that the amount of decrease in flying height during seek will be greater than in the past. For this reason, it has become essential to develop a floating head (air bearing slider) support device that reduces the drop in flying height during seek.

SUMMARY OF THE INVENTION An object of the present invention is to provide a floating head support device that causes less floating during seek and less vertical drop.

[Means for solving problems]

The above object is achieved by connecting the slider mounting portion and the flexible structure support that supports the slider mounting portion on the same plane.

[Effect]

Since there is no bent portion 17 as shown in FIG. 18, the effective point of application of the theta direction force F approaches the center of gravity M of the air bearing slider, thereby reducing the minimum flying height during seek.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side view of a floating head (air bearing slider) support device according to an embodiment of the present invention, showing a state where it is attached to a rotation storage device. Reference numeral 1 denotes a storage medium, which is attached to a shaft (not shown) on the right side of the figure and rotates. 2 is a transducer mounted on the air bearing slider 3. The air bearing slider 3 is attached to a flexible structural support 4. The flexible structural support 4 is attached to the rigid structural support 5.

The rigid structural support 5 has an elastic part 6 and a load beam part 7,
Attach a screw 1o to the guide arm 9 at the connecting part 8 at the other end of the elastic part 6.
It has been concluded. The air bearing slider 3 has a floating surface 11, and the air bearing slider 3 floats due to the bearing action of an air film formed between the rotating storage medium 1 and the floating surface 11. A loading protrusion 12 is disposed between the air bearing slider attachment portion to the flexible structural support 4 and the rigid structural support 5.

FIG. 2 is a top view of the flexible structural support 4. The flexible structure support 4 is made of a rectangular thin metal plate, and the center is punched out in a U-shape to form a space 13. A plate-shaped slider mounting portion 18 is extended from one side (horizontal frame) 16 of the flexible structure support 4 on the same plane as the flexible structure support 4 . Then, the center portion of the slider mounting portion 18 is depressed upward and bulged,
A load protrusion 12 is formed. As a result, the slider mounting portion 18 is attached to the two flexible finger portions 1 via the horizontal frame 16.
5.

The X mark indicated by the reference numeral 14 is a spot welding point for joining with the rigid structural support 5.

The operation of the support device configured as described above will be explained with reference to FIG. When the floating head support device performs a seek operation in the radial direction with an acceleration of α, an inertial force F=mα acts on the center of gravity M of the air bearing slider 3 in the direction shown. Since the rigidity of the air bearing slider 3, adhesive layer 19, attachment part 18, and load beam part 7 is sufficiently greater than the rigidity of the flexible finger part 15, the deformation due to the inertial force is from point B to point 0. It can be said that there is only a flexible finger portion 15 having a length Qa up to. Here, point B may be the welding point of the welding points 14 that is closest to the loading protrusion 12 of the load beam portion 7, and point 0 may be the edge of the flexible finger portion 15 on the loading protrusion 12 side.

Next, the deformation of the flexible finger portion 15 is determined. The applied forces are shearing force Fs and bending moment Mm, respectively (8
) and (9), the inclination angle ic of the flexible finger portion 15 at the 0 point is expressed by the equation (10) (%) (8) However, i is when the floating head support device moves with the acceleration α. As a result, the initial minimum flying height of the air bearing surface 11 is ±Δh
k is the inclination of the air bearing slider 3 in the rolling direction when the air bearing slider 3 changes, and k is the restoring spring constant of the air bearing action. As mentioned above, since the deformation from point 0 to point M can be ignored, i c=i ... (13
), and therefore the flying height reduction amount Δh due to seek can be expressed by equation (14).

IG (14) Here, E, Ia, and δ are the longitudinal elastic modulus of the flexible finger portion 15, the cross-sectional moment of inertia, and the angle of the air bearing slider 3 with respect to the air bearing surface 11, respectively.

Here, considering that △h can be approximately expressed as (16)%
Formula % In this embodiment, since the mounting portion 18 and the flexible finger portion 15 are disposed on the same plane, δ≠O1 and the overlap δ is the adhesive layer 19.
It is composed only of the thick bone of the flexible finger portion 15.

In addition, since Q3 can be kept small, the amount of reduction in the flying height Δh can be made small. Note that in this configuration as well, the slider surface does not interfere with the degree of freedom of the flexible finger portion 15.

4 and 5 are a side view and an enlarged view of essential parts of a floating head support device according to a second embodiment of the present invention. In this embodiment, a stepped portion 2o is formed at the joint portion of the load beam 7 by pressing or the like.
According to this embodiment, in which the flexible structural support 4 is joined to the stepped portion 20, the flexible finger portion 15 is prevented from being deformed by the loading protrusion 12.

6 and 7 are a side view of a floating head support device and a top view of a flexible structure support according to a third embodiment of the present invention. In this embodiment, instead of the stepped portion 2o of the second embodiment, the base portion of the flexible finger portion 15 of the flexible structural support 4 is bent to form a folded portion 20', thereby increasing the height of the protrusion 12. is adjusted to prevent deformation of the flexible fingers 15.

FIGS. 8 and 9 (a) and (b) are a side view of a floating head support device and a top view and a sectional view of a flexible structure support according to a fourth embodiment of the present invention. In this embodiment, the folded part 20' of the third embodiment is provided in the longitudinal direction of the load beam 7, and the folded part 20'
It's Toshide.

10 @ and 11 are a side view of the main parts of a floating head support device and a top view of a flexible structure support according to a fifth embodiment of the present invention. In this embodiment, at the base of the slider mounting portion 18 The horizontal frame 16 is also bent in the longitudinal direction of the beam 7 to form a folded portion 21.

In this way, the point of application of the theta direction force is further increased to the line 41.
3 As the center of gravity approaches M, the amount of reduction in flying height decreases.

FIG. 12 is a top view of a flexible structural support used in a floating head support device according to a sixth embodiment of the present invention. In the flexible structure support 4 in this embodiment, a space 13' is formed by punching out the center of a thin rectangular metal plate in an inverted U-shape, and a tongue-shaped piece formed in the center serves as a slider mounting portion 18. . An adhesive 19 is attached to the lower surface of the slider mounting portion 18 of the flexible structure support 4.
The seek operation of the floating head support device in which the slider 3 is attached and the flexible structural support 4 is welded to the beam 7 at the welding point 14 is as explained in FIG. However, in the case of this embodiment, as shown in FIG. 13, the position of the 0 point is different from that in FIG. 3, and is at the edge of the horizontal frame 16 on the load protrusion 12 side.

Even if the slider mounting portion 12 is provided at the center of the flexible structure support 4 as in this embodiment, if it is on the same plane as the flexible structure support 4, the flying height will be δ cape O in equation (16). The amount of decrease Δh can be reduced.

Although the flexible finger portion 15 and the upper surface of the slider 3 are separated by the thickness of the adhesive layer 19 of the attachment portion, the degree of freedom of the flexible finger portion 15 is not hindered. This can be further ensured by providing a slight recess on the top surface of the slider corresponding to the flexible fingers 15.

14 and 15 are a side view and an enlarged view of essential parts of a floating head support device according to a seventh embodiment of the present invention. In this embodiment, a stepped portion 22 is provided on the load beam 7 at a location where the protrusion 12 contacts, to avoid deformation of the flexible finger portion 15 due to the height of the load protrusion 12, and to adjust the posture of the slider 3. This prevents variations depending on the product.

16 and 17 are a side view of a floating head support device and a top view of a flexible structure support according to an eighth embodiment of the present invention. In this embodiment, the same flexible structure support 4 as in the sixth embodiment (FIG. 12) is provided with a folded portion 23 to avoid deformation caused by the protrusion 12. In this case, from the welding point 14 to the folded part 2
Since up to 3 act as a rigid body, the minimum flying height during seek can be reduced, similar to the embodiment in which the flexible structural support is not provided with folded portions.

〔Effect of the invention〕

According to the present invention, the point of application of the theta direction force acting on the slider during seek can be brought closer to the slider gravity center, thereby reducing the sinking of the slider during seek and preventing contact between the slider and the storage medium. reduce the possibility of
A highly reliable storage device can be obtained.

[Brief explanation of drawings]

1 and 2 are a side view of a floating head support device and a top view of a flexible structure support according to a first embodiment of the present invention, FIG. 3 is an explanatory diagram of the operation of the first embodiment, and FIGS. FIG. 5 is a side view and an enlarged view of essential parts of a floating head support device according to a second embodiment, and FIGS. 6 and 7 are a side view and an enlarged view of a floating head support device according to a third embodiment. Top view, Figure 8 is the 4th
A side view of the floating head support device according to the embodiment, FIG. 9(a)
) is a top view of the flexible structural support of the fourth embodiment, FIG. 9(b)
10 and 11 are side views of the main parts of the floating head support device and a top view of the flexible structure support according to the fifth embodiment, and FIG. A top view of the flexible structure support according to the sixth embodiment, FIG. 13 is an explanatory diagram of the operation of the floating head support device according to the sixth embodiment, and FIGS. 14 and 15 are floating head supports according to the seventh embodiment. A side view and an enlarged view of the main parts of the device; FIGS. 16 and 17 are a side view of the floating head support device and a top view of the flexible structure support according to the eighth embodiment;
FIG. 18 is an explanatory diagram of the operation of a conventional floating head support device. 1...Storage medium, 3...Air bearing slider,
4... Flexible structural support, 5... Rigid structural support, 6...
・Elastic part. 7... Load beam, 12... Load protrusion, 13
... Space (punching part), 15... Flexible finger part, 16.
・Horizontal frame. No. 2 / Ro No. 4 Fig. 5I5s Kuni No. Ro Concave Broom 7 Fig. 8 Old No. cI. No. 10 concave v ll Garden No. 72 Stem 14 Ward No. /6Z Wisteria 170 /B Concave

Claims (1)

[Claims] 1. A floating structure comprising a flexible structural support having a slider mounting part for mounting an air bearing slider and a flexible finger part for supporting the slider mounting part, and for mounting the flexible structural support to a load beam. 1. A floating head support device, wherein the slider attachment portion and the flexible finger portion are formed on substantially the same plane. 2. The floating head support device according to claim 1, wherein the slider mounting portion extends to the tip of the flexible structure support.