JP2533522B2 - Transducer support device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transducer support device for a rotary storage device, and is particularly suitable for a high-density storage device having a small floating amount and a high seek speed. Transducer support device.

[Conventional technology]

The rotary storage device is, for example, as disclosed in Japanese Patent Publication No. 58-22827, a rotating storage medium, a transducer for reading and writing information from the storage medium in a floating state, and The device includes a transducer support device for supporting the device, and an access mechanism for accessing and holding the transducer at a desired radial position of the storage medium. And
The transducer support device is provided with a rectangular notch that forms two outer flexible fingers that are connected by a low-flexibility lateral frame, and extends from the lateral frame toward the notch. A flexible structure support having a flexible central tongue, a rigid structure support having an elastic portion supporting the flexible structure support and a load beam portion, the rigid structure support and the flexible structure support An air bearing slider (hereinafter referred to as a slider) having a load protrusion disposed between the central tongue and a transformer mounted on the central tongue.

The lateral frame is rigid, and the central tongue is substantially rigid because the slider is attached to its lower surface. The only substantial flexing portion of is the outer flexible finger as described above. The outer flexible finger portion is formed in parallel with the central tongue portion, and thus is also in parallel with the plane formed by the air bearing surface of the slider.

When seeking to access the radial position of the rotating medium to the transducer, a radial driving force is applied to the transducer supporting device from the access mechanism. Due to the driving force, the transducer supporting device is accelerated / constant speed and decelerated.

[Problems to be solved by the invention]

In the above-described conventional transducer support device, as described below, there is insufficient consideration for the phenomenon that the slider rolls and the flying height decreases when the driving force is applied.

That is, conventionally, there is a means for accurately measuring the temporal change of the flying height at a high speed, and further, a means for finding the rolling motion of the slider by simultaneously measuring the temporal change of the flying height of the left and right air bearing surfaces of the slider. Because of this, it was not possible to give due consideration to the above phenomenon. The high-speed and precise measurement of the flying height change referred to here means, for example, a flying height change of about 0.01 μm that occurs within 0.5 ms.
It is said that measurement is performed with a resolution of 5 ms to 0.1 ms and 0.001 μm or more.

Conventionally, the second reason that the consideration for reducing the flying height during seek is insufficient is that the flying height is still sufficiently large compared to the estimated reduction amount during seek. That is,
The conventional flying height was 0.4 μm to 1 μm, whereas the flying height reduction amount was considered to be 0.01 μm to 0.03 μm, so it was not considered to be a serious obstacle factor. However, with the recent increase in memory density, the flying height
It has become necessary to reduce the size to 0.2 μm to 0.3 μm, and on the other hand, it is expected that the seek acceleration will increase to shorten the access time and the flying height during seek will decrease more than before. Therefore, it was necessary to give sufficient consideration to the decrease in the flying height during seeking.

Next, the conventional way of thinking about the cause of the decrease in the flying height during seek will be described.

When a force F in the seek direction is transmitted from the flexible structure support to the slider, this force F tends to rotate the slider around the center G of its mass. When considering the rotation of the slider, the point of action of this force can be considered to be on the mounting surface of the slider. Therefore, the moment M _G is M _G = F1 ₁ (1) when the arm length is l ₁ . M _G balances with the restoring moment Mr = Ki (2) which is generated when the flying height of the flying surface of the slider changes by ± Δh and the slider tilts by an angle i. Here, k is a restoring spring constant.

Here, Δh = l ₂ i (3) F = mα (4) Is represented by Here, m is the mass of the 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 of the flying height of the slider's air bearing surface,
When the Δh at the seek time of the transducer support device was measured for various slider masses m and arm lengths l _1, it was found that the actually measured Δh was much larger than the above-mentioned equation (5). That is, Δh is represented by L being the distance from the substantial action point of the seek direction force F to the slider to the center G of the mass. It was found that L> l ₁ (7)

Explaining this cause in more detail, it was found that the deformation of the outer flexible finger portion greatly affects the magnitude of Δh. That is, the mass center G of the slider is on the storage medium side with respect to the outer flexible fingers. Therefore, when an inertial force (F = mα) acts on the slider due to the seek acceleration α, the outer flexible finger portion is deformed in the direction in which Δh becomes larger due to this.

In the conventional transducer support device, as described above, the substantial point of action of the force in the seek direction on the slider is largely separated from the center G of the mass of the slider. There was a problem that the amount of levitation decreased significantly.

SUMMARY OF THE INVENTION An object of the present invention is to provide a transducer support device that reduces a reduction in the flying height of the transducer mounting means at the time of seeking and reduces the possibility of contact between the transducer mounting means and the storage medium.

[Means for solving problems]

In the transducer support device of the present invention, the flexible structure support to which the slider is mounted is joined to the end of the substantially flexible part of the flexible structure, which is a rigid structure support member of the substantially flexible part. The end of the slider is made to approach the plane formed by the air bearing surface of the slider, and the bending rigidity about the axis orthogonal to the access direction and parallel to the plane formed by the air bearing surface of the transducer mounting means is uniform in the access direction. It has flexible fingers that increase or decrease.

[Action]

A rotational moment and a shearing force act on the flexible portion of the flexible structure support during seek due to seek acceleration. The change in the flying height caused by the inclination of the flexible portion due to the shearing force acts to reduce the reduction in the flying height caused by the inclination of the flexible portion due to the rotation moment. As a result, the slider can reduce the decrease in the flying height during seeking.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of an embodiment of a transducer supporting device of the present invention, showing a state where the device is attached to a rotary storage device. A storage medium 1 is attached to a shaft (not shown) on the right side of the drawing and is rotating. Reference numeral 2 denotes a transformer mounted on an air bearing slider 3 (hereinafter referred to as slider 3) as a transformer mounting means.
The slider 3 is attached to the flexible structure support 4. The flexible structure support 4 is attached to the rigid structure support 5.

The rigid structure support 5 has an elastic portion 6 and a load beam portion 7, and is screwed to a guide arm 9 at a connecting portion 8 at the other end of the elastic portion 6.
It is concluded at 10. The slider 3 has an air bearing surface 11, and the slider 3 is levitated by the bearing action of an air film formed between the rotating storage medium 1 and the air bearing surface 11. A load projection 12 is disposed between the slider mounting portion of the flexible structure support 4 and the rigid structure support 5.

FIG. 2 is a plan view of the flexible structure support 4. Reference numeral 13 denotes a joint portion with the rigid structure support 5, and 14 denotes a spot welding point for joining. Reference numeral 15 is a flexible finger portion, and two flexible finger portions are provided on the same plane as the joint portion 13. The width w of the flexible finger portion is wide on the joint portion 13 side because the width W of the flexible structure support 4 changes. It is getting narrower on the side. The horizontal frame 16 connects the two flexible fingers 15, 15 via a step 17.

Reference numeral 18 denotes a mounting portion which has a tongue shape extending from the horizontal frame 16 and on which the slider 3 is mounted. Load protrusion 12 is the mounting part
It is formed by the dimple provided in 18.

FIG. 3 is a side view showing the details of the relative relationship among the slider 3, the flexible structure support 4 and the load beam section 7 in a state where the slider 3 is attached to the rotating body storage device. In this embodiment, the terminal end B of the flexible finger portion 15 on the joint portion 13 side is closer to the plane 20 formed by the air bearing surface 11 than the terminal end C on the step portion 17 side.

FIG. 4 is a diagram for explaining the operation of this embodiment, in which the parameters relating to the side view of the slider 3, flexible structure support 4 and rigid structure support 5 are entered. In FIG. 1, the operation of the present embodiment during the seek operation of the transducer support device in the radial direction at the acceleration of α will be described. When the transducer support device moves at the acceleration α in the illustrated direction, an inertial force F = mα acts on the center G of the mass of the slider 3 in the illustrated direction. Since the rigidity of the air bearing slider 3, the adhesive layer 19, the mounting portion 18, the step portion 17 and the load beam portion 7 is sufficiently larger than the rigidity of the flexible finger portion 15, it is deformed by the inertial force. The only flexible portion is the flexible finger portion 15 having a length of 1 _G from the point B to the point C.

Here, point B may be a boundary at which the width w of the flexible finger portion 15 rapidly increases toward the joint portion 13 side, and point C may be the edge of the step portion 17 on the side of the load projecting portion 12 side. Now, the deformation of the flexible finger portion 15 is obtained. In addition its dependent force shear force Fs and the bending moment M _G, respectively (8), the (9) from the formula, the inclination angle ic of flexible fingers 15 at point C (10) .

Fs = mα ... (8) M m = mα (l 1 + l 3) ki ... (9) i c = i s ± i m ... (10) where, i _s is flexible at point C by the shear force Fs Finger
The tilt angle of 15 and i _m are the tilt angles of the flexible finger portion 15 at the point C due to the bending moment, and are respectively expressed by equations (11) and (12).
It is represented by a formula.

However, i is the initial minimum flying height h of the air bearing surface 11 is ± Δ due to the movement of the transducer support device at the acceleration α.
It is the inclination of the slider 3 in the rolling direction when changed by h, and k is the restoring spring constant of the air bearing action. Further, x is the distance from the point B along the flexible finger portion 15, E, I _G , and δ are the local longitudinal elastic modulus, the local moment of inertia of the flexible finger portion 15, and the air bearing surface of the slider 3, respectively.
11 is a local inclination angle with respect to the plane 20 formed by 11.

As described above, since the deformation from the C point to the M point can be ignored, it can be set as i _c = i (13). Therefore, the minimum flying height Δh due to seek can be expressed by the equation (14). It

In this embodiment, the end point B of the flexible finger portion 15 connected to the joint portion is formed on the slider air bearing surface 11 more than the end point C of the flexible finger portion 15 connected to the step portion. The local inclination angle δ is negative because it is close to the flat plane 20.

The width W of the flexible structure 4 is wide on the side of the joint portion 13 and narrow on the side of the horizontal frame 16.

According to the embodiment described above, since the local inclination angle δ becomes negative, the floating subsidence amount Δh _s during seek due to the deformation of the flexible finger portion 15 due to the shearing force. Since Δ can be made negative, Δh can be reduced by this amount.

Further, since the width W of the flexible structure support 4 is widened on the side of the joint portion 13, the connection with the rigid structure support 5 can be carried out with sufficient reliability, while the width W is Since it is narrowed on the step portion 17 side, it is difficult to be excited by the air flow caused by the rotation of the disk. Furthermore, the point of action of the flexible structure support 4 can be brought closer to the center of gravity G of the slider.

The effects of the above two effects synergistically reduce the possibility of contact between the slider and the storage medium, and a highly reliable storage device can be obtained.

〔The invention's effect〕

As described above, according to the present invention, it is possible to reduce a decrease in the flying height of the transducer mounting means during a seek operation, so that a highly reliable device can be obtained.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the transformer supporter of the present invention, FIG. 2 is a plan view showing the details of the flexible structure support of FIG. 1, and FIG. 3 is the air bearing of FIG. -Side view showing the details of the slider, the flexible structure support and the load beam part, and Fig. 4 is an operation explanatory view of an embodiment of the present invention. 1 ... Storage medium, 3 ... Slider, 4 ... Flexible structure support, 5 ...
Rigid structure support, 6 ... Elastic part, 7 ... Load beam part, 11 ...
Air bearing surface, 12 ... Loading protrusion, 15 ... Flexible fingers, 18 ... Mounting part.

Continuation of front page (56) References JP-A-57-88572 (JP, A) JP-A-60-209984 (JP, A) JP-B-58-22827 (JP, B2)

Claims (1)

(57) [Claims] 1. A rigid arm portion connected to an access mechanism; an elastic portion attached to the rigid arm portion; and an elastic portion adjacent to the rigid arm portion; A rigid structure support having a load beam for providing; a flexible structure support attached to a free end side of the rigid structure support; and a transducer mounting means attached to the flexible structure support, The load beam portion of the support is parallel to the plane formed by the air bearing surface of the transducer mounting means, the flexible structure support extends in the longitudinal direction of the rigid structure support, is orthogonal to the access direction, and has a transducer mount. Two flexible fingers whose flexural rigidity is uniformly reduced in the access direction; and a lateral frame connecting the extension tips of the two flexible fingers via a step. From the horizontal frame It has an extended tongue-shaped mounting portion, and the transducer mounting means is joined to this tongue-shaped mounting portion, and the rigid arm portion side end of the flexible portion of the flexible finger portion is connected to the tongue-shaped mounting portion side end. Configured to be closer to the plane formed by the air bearing surface of the transducer mounting means, and a load projection for transmitting a load force from the free ends of the rigid structure support and the flexible structure support to the tongue-shaped mounting portion. And a transducer support device having a.