JPH0673233B2 - 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 disclosed in, for example, Japanese Patent Application Laid-Open No. 558692/1985, which includes a rotating storage medium, a transducer for reading / writing information, a transducer supporting device for supporting the transducer, and An access device for accessing and holding the transducer at any desired radial position on the rotating medium. The conventional transducer support device is disclosed in JP-A-55-22296.
As disclosed in Japanese Patent Laid-Open Publication No. JP-A-2004-242242, a rectangular notch forming two outer flexible fingers connected by a low-flexibility lateral frame, and extending from the lateral frame toward the notch. A flexible body having a flexible body central tongue portion, a member that also serves as an elastic portion that supports the flexible body, and a load beam portion, and is disposed between the dual-use member and the central tongue portion. And an air bearing slider (hereinafter simply referred to as a slider) having a transducer mounted thereon is attached to the central tongue.

A radial drive force is applied to the transducer support device from the access device during a seek to access the transducer to an arbitrary radial position on the rotating medium.

The driving force accelerates the transducer support device.
It is decelerated at a uniform speed. In the 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. The reduction of the flying height increases the possibility that the slider and the rotating medium will come into direct contact with each other, which lowers the reliability of the apparatus, which is not preferable.

The first reason that the consideration for the reduction of the flying height at the time of seeking has conventionally been insufficient is considered as follows.

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. In addition,
High-speed and precise measurement of flying height change here
Change the flying height of 0.01 μm within 0.5 ms from 0.05 to
It means that measurement is performed with a resolution of 0.1 ms and 0.001 μm or more.

Conventionally, the second reason that the consideration for the reduction in the flying height during seek is insufficient is that the flying height is still sufficiently large compared to the estimated value of the reduction in flying height during the seek. That is, the conventional flying height was estimated to be 0.4 to 1 μm, whereas the conventional flying height reduction amount was estimated to be 0.01 to 0.03 μm, and therefore it was not considered to be a serious obstacle factor.
However, with the recent increase in memory density, the flying height must be reduced to 0.2 μm to 0.3 μm.
On the other hand, it is expected that the seek acceleration will be increased to shorten the access time, and the decrease in the flying height during seeking will be larger than in the past.Therefore, sufficient countermeasures will be taken against the decrease in flying height during seeking. Became necessary.

[Problems to be solved by the invention]

FIG. 8 shows the conventional way of thinking about the cause of the decrease in the flying height during seek.

When a force F in the seek direction is transmitted to the slider 3 from the flexible structure support body 4 through the mounting portion 20 and the adhesive layer 21, this force tends to rotate the slider 3 around its center of gravity M. The moment M _m is M _m = Fl ₁ (1) because the arm length is l ₁ . M _m balances with a restoring moment M _r = ki (2) generated by the flying amount of the floating surface 11 changing by ± Δh and the slider 3 tilting by an angle i. Here, k is a restoring spring constant.

Here, from Δh = l ₂ i (3) F = mα (4), It 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, a means for measuring the temporal change of the flying height of the floating surface 11 was developed, and a transformer supporter for various slider masses m and arm lengths l ₁ was developed. When the Δh at the time of seeking was measured, it was found that the actually measured Δh was much larger than that of the equation (5). That is, Δh is represented by L being the distance from the substantial force point of the force F in the seek direction to the center of gravity M of the slider 3. It was found that L> l ₁ (7)

As mentioned above in the conventional transducer support device,
There is a problem in that the fact that the substantial point of action of the force in the seek direction on the slider 3 is abnormally distant from the center of gravity M is insufficiently considered, and the amount of reduction in the flying height during seek is large.

An object of the present invention is to prevent the flying height from decreasing during seek, and to prevent direct contact between the slider and the rotating medium.

[Means for solving problems]

The above object is achieved by matching the distance from the air bearing surface of the slider to the substantial force application point of the seek direction force on the slider with the distance from the air bearing surface of the slider to the center of gravity of the slider.

[Action]

(6) In the transducer support device configured such that the distance from the air bearing surface to the substantial force application point of the seek direction force is equal to the distance from the air bearing surface to the center of gravity of the slider,
Since L in the formula becomes 0, the amount of decrease in the flying height during seek Δh
Can be zero.

〔Example〕

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view of the transformer supporter of the first embodiment, showing a state where it 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 is a transformer, which is mounted on the slider 3. 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,
The guide arm 9 is fastened to the guide arm 9 with a screw 10 at the connecting portion 8 at the other end of the elastic portion 6. 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 on the flexible structure support 4 and the rigid structure support 5.

FIG. 2 is a plan view of the flexible structure support 4. 13 is a joint with the rigid structure support 5, and 14 is a welding point for joining. Reference numeral 15 is a flexible finger portion. Two flexible fingers 15
Is connected by the first step portion 16 and the first horizontal frame 17, and as can be seen in the figure, the angle formed with the air bearing surface 11 is a negative angle (that is, the joint portion 13 side of the flexible finger portion 15 is The slider mounting portion 20 side is closer to the air bearing surface 11.). Further, the joint portion 13 has a tongue-like shape extending from the first lateral frame 17 to the center.

The second horizontal frame 19 has two flexible fingers via the second step 18.
The other end of 15 is connected. Reference numeral 20 denotes a mounting portion for mounting the slider 3, which has a tongue-like shape that extends from the second horizontal frame 19 to the center, and is on the opposite side of the slider 3 from the center of gravity M of the slider 3. It is attached to the formed mounting surface. As shown in FIG. 1, the joint portion 13 and the attachment portion 20 are divided into two spaces that are separated by the plane in which the flexible finger portion 15 extends, and extend. As shown in FIG. 1, the first step portion 16 and the second step portion 18 are formed in different directions of the plane in which the flexible finger portion 15 is extended.

The load protrusion 12 is formed by a recess provided in the mounting portion 20.

The feature of the present invention resides in that the distance from the air bearing surface 11 to the point D on which the force in the seek direction is substantially applied is equal to the distance to the center of gravity M of the slider 3. As will be described later, the substantial point D of action of the seek direction force is substantially at the midpoint of the flexible finger portion 15. Therefore, the feature of the invention of this embodiment resides in that the middle point of the flexible finger portion 15 is aligned with the center of gravity of the slider 3.

FIG. 3 is a side view of the slider 3, the flexible structure support 4, and the rigid structure support 5 for explaining the operation of this embodiment, in which relevant parameters are entered. In FIG. 3, 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 an acceleration α in the direction shown, an inertial force F = mα acts on the center of gravity M of the slider 3 in the direction shown. Slider 3, adhesive layer 21, mounting portion 20, second step portion 18,
The rigidity of the first step 16 and the load beam 7 depends on the flexible fingers.
Since it is sufficiently larger than the rigidity of 15, it is substantially the length l _G from point B to point C that is deformed by the inertial force.
It can be said that it is only the flexible finger portion 15 of. Here, the point B may be the edge of the first step portion 16 on the slider side, and the point C may be the edge of the second step portion 18 on the load protrusion 12 side.

Now, the deformation of the flexible finger portion 15 is obtained. The applied force is the shearing force F _s and the bending moment M _m , which are represented by the equations (8) and (9), respectively. Therefore, the inclination angle i _c of the flexible finger portion 15 at the point C is represented by the equation (10). become.

_{F s = mα ... (8)} M m = mα (l 1 + l 3) -ki ... (9) i c = i s + i m ... (10) Here, However, i is that the initial minimum flying height n of the air bearing surface 11 is ± Δ because the transducer support device moves 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. As described above, since the deformation from the point C to the point M can be ignored, it can be set as i _c = i (13), and thus the flying height decrease Δh due to the seek can be expressed by the equation (14). .

Here, E, I _G , and δ are the longitudinal elastic modulus of the flexible finger portion 15, the moment of inertia of section, and the angle with respect to the air bearing surface 11 of the slider 3, respectively.

here, Considering that, Δh is approximately represented by the equation (16).

In this example Δ is configured to have a negative angle.

FIG. 4 is a view showing a second embodiment of the present invention and shows a mounting relationship between the flexible structure support 4 and the slider 3. The feature is that the mounting portion 20 is provided in parallel with the air bearing surface of the slider 3. As a result, the air bearing surface of the slider 3 can be formed as a continuous surface.

FIG. 5 shows a third embodiment of the present invention.

The mounting portion 18 is adhered to the upper surface 22 of the slider 3 which is separated from the center of gravity M. The flexible finger portion 15 is lowered by the second step portion 18 to a position where the distance from the air bearing surface 11 of the slider 3 is equal to the distance l _M from the air bearing surface 11 of the center of gravity M, and further the first step portion. 1
It is welded to the load beam portion 7 at the joint portion 13 via. The joint portion 13 and the attachment portion 20 in the flexible structure support 4 of this embodiment are separated by a plane in which the flexible finger portion 15 extends 2.
It extends to one side of one space, that is, the elastic portion 5 side.

〔The invention's effect〕

According to the present invention, it is possible to prevent the slider from sinking during seek, reduce the possibility of contact between the slider and the storage medium, and obtain a highly reliable storage device.

[Brief description of drawings]

FIG. 1 is a side view of the first embodiment of the present invention, and FIG.
FIG. 3 is a plan view showing details of the flexible structure support, FIG. 3 is an operation explanatory view of the first embodiment of the present invention, and FIG. 4 is a detailed view of the flexible structure support in the second embodiment of the present invention. FIG. 5 is a plan view, FIG. 5 is a side view of the third embodiment of the present invention, and FIG. 6 is an operation explanatory view of a conventional transformer device supporting device. 1 ... storage medium, 3 ... air bearing slider,
4 ... Flexible structure support, 5 ... Rigid structure support, 6 ... Elastic part, 7 ... Load beam part, 8 ... Coupling part, 11 ... Air bearing surface, 12 ... Load projection part, 13 ... Joining portion, 15 ... Flexible finger portion, 16 ... First step portion, 17 ... First horizontal frame, 18 ... Second step portion, 19 ... Second horizontal frame , 20 …… Mounting part.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masaaki Matsumoto 1-280 Higashi Koigakubo, Kokubunji, Tokyo Metropolitan Research Laboratory, Hitachi, Ltd. (72) Inventor Hiroshi Daito 2880, Kozu, Odawara, Kanagawa Prefecture Inside the Odawara Plant (72) Inventor Yoshihiko Miyake 2880 Kokuzu, Odawara, Kanagawa Stock Company Hitachi Ltd.Odawara Plant (72) Inventor Masanobu Honda, 2880 Kokuzu, Odawara, Kanagawa Hitachi Ltd. Odawara Plant (72) Inventor Yoshiyuki Hirano 1-280, Higashi Koigakubo, Kokubunji City, Tokyo Inside Central Research Laboratory, Hitachi, Ltd. (56) Reference JP-A-57-88572 (JP, A) JP-A-55-25887 (JP, A)

Claims (8)

[Claims] 1. An air bearing slider having an air bearing surface, a mounting portion for mounting the slider, a flexible structure support having flexible finger portions and a joint portion, an elastic portion and a load beam portion. In the transducer support device including a rigid structure support, the mounting portion is provided at a position deviated from the center of gravity of the slider, and the distance from the air bearing surface of the air bearing slider to the center of gravity of the air bearing slider is set. The transducer support device is characterized in that the distance from the air bearing surface to the midpoint of the flexible finger portion, which is the substantial force point of the driving force in the seek direction with respect to the air bearing slider, is made equal. 2. The flexible structure support extends in the same plane.
A flexible finger portion of a book; a first horizontal frame and a second horizontal frame that connect the flexible finger portion at both ends via a first step portion and a second step portion; Of the air frame extending from the second horizontal frame and the joint portion extending from the horizontal frame of
The transducer support device according to claim 1, further comprising a mounting portion for mounting a bearing slider. 3. The flexible finger portion of the flexible structure support extends obliquely at a negative angle with respect to the air bearing surface of the air bearing slider. The transducer support device according to item 2 or item 3. 4. The joint portion extending from the first lateral frame and the mounting portion extending from the second lateral frame of the flexible structure support are located on the center side of the flexible structure support and have flexible fingers extending therefrom. 4. The transducer support device according to claim 3, wherein the transducer support device is divided into two spaces that are separated by a flat plane and extends. 5. The flexible fingers of the flexible structure support are substantially parallel to the air bearing surface of the air bearing slider, and the distance from the air bearing surface is from the center of gravity of the air bearing slider. The transducer support device according to claim 2, wherein the distance is equal to the distance to the air bearing surface. 6. A first horizontal frame of the flexible structure support has a joint portion extending toward the center of the flexible structure support, and a second horizontal frame has a direction of extension of the joint portion. The transducer support device according to claim 5, further comprising a mounting portion that extends outward of the flexible structure support in the same direction. 7. The joint portion extending from the first lateral frame and the mounting portion extending from the second lateral frame are separated by a plane in which the flexible fingers of the flexible structure support extend. 7. The transducer support device according to claim 6, wherein the transducer support device is divided into two spaces and extended. 8. The joint portion extending from the first horizontal frame and the attachment portion extending from the second horizontal frame are both separated by a plane in which the flexible finger portion of the flexible structure support extends. Claim 6 characterized in that it extends in one of the two spaces.
The transducer support device according to the paragraph.