JP2738678B2 - Transducer support device - Google Patents

Description

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 flying height of a transducer and a high seek speed. And a transducer support device. 2. Description of the Related Art As disclosed in, for example, Japanese Patent Application Laid-Open No. 55-8682, a rotary storage device includes a rotating storage medium, a transducer for reading and writing information, and a transducer for supporting the transducer. Accessing the user support device and the transducer to any desired radial position of the rotating medium;
And an access device to be held therein. Further, the conventional transducer supporting device is disclosed in
No. -22296, a rectangular notch forming two outer flexible fingers connected by a low-flexible horizontal frame and a low-flexibility step; A flexible portion having a flexible body central tongue extending from the frame toward the cutout portion; a member serving also as an elastic portion supporting the flexible body and a load beam portion; And an air bearing slider having a transducer mounted on the central tongue. When the transducer is to be accessed at an arbitrary radial position of the rotating medium, a radial driving force is applied to the transducer supporting device from the access device. Due to the driving force, the transducer supporting device is accelerated / constant speed / decelerated. [Problems to be Solved by the Invention] As described below, in the conventional transducer supporting device, when the above-described driving force is applied, the air bearing slider rolls and the phenomenon that the flying height decreases is reduced. There was a lack of consideration. Reducing the flying height increases the possibility that the air bearing slider and the rotating medium come into direct contact with each other, thereby lowering the reliability of the apparatus, which is not preferable. The first reason why the consideration for the decrease in the flying height during the conventional seek was insufficient is considered as follows. That is, conventionally, a means for measuring the temporal change of the flying height at high speed and precisely, and thus, the air bearing
Since there is no means for simultaneously measuring the temporal change of the flying height of the left and right flying surfaces of the slider to find the rolling motion of the air bearing slider, sufficient consideration for the above-mentioned phenomenon cannot be made. The high-speed and precise measurement of the flying height change referred to here means, for example, a flying height change of 0.01 μm generated within 0.5 ms of 0.05 to 0.1 ms and 0.001 μm.
It refers to measuring with a resolution of μm or more. Conventionally, the second reason for the lack of consideration for the flying height reduction during seek is that the flying height is still sufficiently large compared to the estimated value of the flying height reduction during seek. That is, while the conventional flying height was 0.4 to 1 μm,
Since the conventional flying height reduction amount was estimated to be 0.01 to 0.03 μm, it was not considered to be a serious obstacle factor. However, recently, as the storage density has increased, the flying height has to be reduced to 0.2 μm to 0.3 μm. On the other hand, the seek acceleration has increased to shorten the access time, and the flying height during seeking has increased. Since the drop is expected to be larger than in the past, sufficient measures have to be taken to reduce the flying height during seek. FIG. 4 shows the conventional concept of the cause of the decrease in the flying height during seeking. When a force F in the seek direction is transmitted to the air bearing slider 3 from the flexible support 4 through the mounting portion 18 and the adhesive layer 19, this force causes the air bearing slider 3 to rotate around its center of gravity M. To try. Its moment
Since M _m has an arm length of l ₁ , M _m = Fl ₁ (1). M _m is such that the flying height of the air bearing surface 11 changes by ± Δh,
The restoring moment M _r = k _i caused by the inclination of the air bearing slider 3 by the angle i is balanced with (2). Here, k is a restoration spring constant. Here, Δh = l ₂ i (3) F = mα (4) Is represented by Here, m is the mass of the air bearing slider, and α is the seek acceleration. In order to confirm the correctness of the above concept, a means for measuring the temporal change of the flying height of the flying surface 11 was developed, and various
And it was measured for Δh in a seek operation of the transducer supporting device l _1, actually measured Δh was found to be much greater than (5). That is, Δh is defined as a distance from the substantial difference point of the seek direction force F to M, and L is defined as It was found that L> l ₁ (7). As described above, the conventional transducer support apparatus does not sufficiently consider that the substantial point of action of the seek direction force on the air bearing slider 3 is abnormally far from the center of gravity M, and the flying height during seek is insufficient. There was a problem that the amount of reduction was large. SUMMARY OF THE INVENTION It is an object of the present invention to provide a highly reliable disk device by reducing a decrease in flying height during a seek operation and minimizing direct contact between an air bearing slider and a rotating medium. [Means for Solving the Problems] The above object is achieved by bringing the substantial point of application of the seek direction force closer to the center of gravity of the air bearing slider. [Action] The actual point of application of the seek direction force is
In the transducer supporting device close to the center of gravity of the slider, since L in Expression (6) becomes small, it is possible to reduce the amount of decrease Δh in the flying height during seeking. Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a transducer supporting device according to the present invention, showing a state where the transducer supporting device is attached to a rotary storage device. Reference numeral 1 denotes a storage medium which is mounted on a shaft (not shown) on the right side of the drawing and is rotating. Reference numeral 2 denotes a transducer mounted on the air bearing slider 3. air·
The bearing slider 3 is attached to the flexible support 4. The flexible structure support 4 is attached to the rigid structure support 5. The rigid structure support 5 has an elastic part 6 and a load beam part 7, and is screwed to the guide arm 9 at a coupling part 8 at the other end of the elastic part 6.
It is concluded at 10. The air bearing slider 3 has an air bearing surface 11. The air bearing slider 3 has an air film formed between the rotating storage medium 1 and the air bearing surface 11.
The bearing slider 3 is levitated. The rigid structure support 5 is provided with a load projection 12. 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 reference numeral 14 denotes a welding point for joining. 15 is a flexible finger. Two flexible fingers
15 is connected by a step 17 and a horizontal frame 16, and the joint 13 is connected by a horizontal frame.
It has a tongue shape extending from 16 to the center. The horizontal frame 19 connects the other ends of the two flexible finger portions 15.
Reference numeral 18 denotes a mounting portion, which has a tongue shape extending outward from the horizontal frame 19. The air bearing slider 3 is mounted on the mounting portion 18. A feature of the present invention resides in that a substantial point of application of the seek direction force is close to the center of gravity M of the slider. It is in. Therefore, the feature of the present invention is the first
The point is that the end 21 on the access side of the flexible finger 15 shown in the figure is farther from the plane formed by the floating surface 11 than the end 20 on the slider side. As a result, the midpoint of the flexible finger portion 15 coincides with the center of gravity (M) of the slider 3. FIG. 3 shows a slider 3 for explaining the operation of this embodiment.
In the side view of the portion of the flexible structure support 4 and the rigid structure support 5, relevant parameters are entered. In FIG. 3, the operation of the present embodiment when the transducer supporting device is performing a seek operation at an acceleration of α in the radial direction will be described. When the transducer support device moves with the acceleration α in the direction shown,
An inertia force F = mα acts on the center of gravity M of the slider 3 in the illustrated direction. Since the stiffness of the slider 3, the mounting portion 18, and the load beam portion 7 is sufficiently larger than the stiffness of the flexible finger portion 15,
It can be said that only the flexible finger portion 15 having the length l _G from the end portion 21 to the end portion 20 is substantially deformed by the inertial force. Here, the end 21 may be the edge of the step 17 on the slider side, and the end 20 may be the edge of the mounting portion 18 on the guide arm side. Now, the deformation of the flexible finger portion 15 is determined. The applied force is a shear force F _s and a bending moment M _m (8), respectively.
(9), the flexible finger at the end 20
The inclination angle _{ic of} 15 is given by equation (10). _{F s = mα ...... (8)} M m = mαl 1 -K i ...... (9) i c = i s + i m ...... (10) where However, i is that the initial minimum flying height h of the flying surface 11 is ± due to the fact that the transducer supporting device has moved at the acceleration α.
This is the inclination of the slider 3 in the rolling direction when it changes by Δh, and K is the restoring spring constant of the air bearing action. As described above, since the deformation from the end portion 20 to the center of gravity M can be neglected, it can be set as i _c = i (13). Therefore, the flying height reduction amount Δh due to seek can be expressed by equation (14). You. Here, E, _IG , and δ are the longitudinal modulus of elasticity of the flexible finger portion 15, the moment of inertia of the section, and the angle of the slider 3 with respect to the flying surface 11, respectively. here In consideration of the above, Δh is approximately expressed by equation (16). In this embodiment, Δ is configured so that [Effects of the Invention] According to the present invention, the substantial point of the seek direction force acting on the slider at the time of seeking can be matched at the center of gravity of the slider. The possibility of contact of the storage medium is reduced, and a highly reliable storage device can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a transducer supporting device according to an embodiment of the present invention, FIG. 2 is a plan view showing details of a flexible structure support 4 of FIG. 1, and FIG. FIG. 4 is a diagram for explaining the operation of the embodiment of the present invention.
The figure is an explanatory view of the operation of the conventional transducer supporting device. 1 ... storage medium, 3 ... air bearing slider,
4 Flexible support, 5 Rigid support, 6 Elastic part, 7 Beam for load, 11 Floating surface, 12 Protrusion for load, 15 Flexible Finger part, 18 ... Mounting part.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Mikio Tokuyama               502 Kandachicho, Tsuchiura-shi Hitachi, Ltd.               Inside the factory machinery laboratory                (56) References JP-A-52-146612 (JP, A)                 JP-A-55-25887 (JP, A)                 Shokai Sho 61-3572 (JP, U)

Claims (1)

(57) [Claims] Flexible structure support having an air bearing slider having an air bearing surface, a mounting portion for mounting the slider, a flexible portion forming a central portion following the mounting portion, and a joining portion following the flexible portion And a rigid structure support having a load beam portion to which a joint of the flexible structure support is joined, and a resilient portion following the load beam portion. The air bearing slider comprises: A load is applied from the load beam portion of the rigid structure support via the surface opposite to the floating surface, and the mounting surface of the mounting portion of the flexible structure support is formed by the floating surface more than the center of gravity of the slider. A transducer supporting device, wherein the end near the joining portion is closer to the plane formed by the floating surface than the center of gravity of the slider.