JPS63187476A - Transducer supporting device - Google Patents

Abstract

PURPOSE:To decrease the possibility of contact between a slider and a storage medium by approaching the rigid structure supporting body bonding end of a flexible part to a plane formed with the floating face of the slider with respect to the slider mounting side end of the flexible part in a soft structure supporting body fitted with the slider so as to decrease the reduction in the quantity of floating of the slider at seeking. CONSTITUTION:The rigid structure supporting body 5 has an elastic part 6 and a loading beam part 7 and is tightened to a guiding arm 9 by a screw 10 by means of the coupling part 8 of the other end of the elastic part 6. The slider 3 has a floating face 11 to float the slider 3 by the bearing action of the air film formed between the turning storage medium 11 and the floating face 11 and a loading projection 12 is arranged between the slider fitting part of the soft structure supporting body 4 and the rigid structure supporting body 5. While the loading beam part 7 is kept in parallel with the plane formed by the floating face 11, the end of the access mechanism of the flexible finger part 15 is approached to the plane formed by the floating face from the end of the slider. Thus, the radial movement of the transducer 2 is minimized and the reduction in the slider floating quantity by the seeking is reduced simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a transducer support device for a rotating storage device, and is particularly suitable for high-density storage devices where the floating area of the transducer is small and the seek speed is high. The present invention relates to a transducer support device.

[Conventional technology]

A rotating storage device, as disclosed in Japanese Patent Publication No. 58-22827, includes a rotating storage medium, a transducer that reads and writes information while floating on the storage medium, and the transducer. and an access mechanism for accessing and retaining the transducer at any desired radial position on the storage medium. The transducer support device includes a rectangular notch forming two outer flexible fingers connected by a low-flexibility horizontal frame, and a rectangular notch extending from the horizontal frame toward the notch. a flexible structural support having a flexible central tongue; a rigid structural support comprising an elastic section supporting the flexible structural support; and a loading beam; the rigid structural support and the flexible structural support. and a load protrusion disposed between the central tongue of the air transducer and the transducer mounted on the central tongue.
A bearing slider (hereinafter referred to as slider) is attached.

The above-mentioned horizontal frame is made strongly, and the above-mentioned central tongue has a slider attached to its lower surface, so it is substantially rigid, so in the end, the above-mentioned almost rectangular flexible body The only substantial flexible portion of the is the aforementioned outer flexible finger. Since the outer flexible fingers are formed parallel to the central tongue, they are also parallel to the plane formed by the float and surface of the slider.

During a seek to access the transducer to any radial position on the rotating medium, a radial driving force is applied from the access mechanism to the transducer support device. The driving force causes the transducer support device to accelerate, maintain constant velocity, and decelerate.

[Problem that the invention seeks to solve]

In the conventional transducer support device described above, consideration has not been given to the phenomenon that the slider rolls and the flying height decreases when the driving force is applied, as described below.

In other words, conventionally there was no means to accurately measure temporal changes in the flying height at high speed, and therefore, there was no means to detect rolling motion of the slider by simultaneously measuring temporal changes in the flying height of the left and right flying surfaces of the slider. However, sufficient consideration could not be given to the above-mentioned phenomenon. Note that high-speed and precise measurement of flying height changes here means, for example, flying height changes of about 0.01 μm that occur within 0.5 ms to 0.05 m5 to 0.1 ms and 0.001 μm.
This means that measurements must be made with a resolution higher than that.

The second reason why consideration has not been given to reducing the flying height during seek in the past is that the flying height was still sufficiently large compared to the estimated reduction amount during seek. In other words, while the conventional flying height was 0.4 μm to 1 μm, the reduction in flying height was thought to be 0.01 μm to 0.03 μm, so it was not considered to be a serious cause of failure. . However, as storage density has recently become higher, it has become necessary to reduce the flying height to 0.2 μm to 0.3 μm, while seek acceleration has increased to shorten access time. Since it is now expected that the reduction in flying height during seek will be greater than in the past, it has become necessary to give sufficient consideration to the reduction in flying height during seek.

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

When a force F in the theta direction is transmitted from the flexible structural support to the slider, 5 this force F tends to rotate the slider about its center of mass G. When considering the rotation of the slider, the point of application of this force can be considered to be at the mounting surface of the slider. Therefore, the moment MG is Ma=FQ□ (1
). Ma is the restoring moment M r = K i ・ which occurs when the flying height of the slider's flying surface changes by ±Δh and the slider tilts by an angle f1.
...Balances with (2). Here, k is a restoring spring constant.

Here, Δh = n z i
...(3) F=mα
...From (4), the above Δh is Δh = Q x Q 1
...It is expressed as (5). 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 in the flying height of the slider's flying surface, and we developed a method to measure the variation of the transducer support device for various slider masses m and arm lengths Ql. When Δh during seek was measured, it was found that the actually measured Δh was much larger than the above-mentioned equation (5). That is, if L is the distance from the point of practical application of the theta direction force F on the slider to the center of mass G, and Δh is expressed as L>ρ... (7)
It turned out to be.

Explaining the cause of this in more detail, it was found that the aforementioned deformation of the outer flexible fingers greatly influenced the magnitude of Δh. That is, the center of mass G of the slider is located on the storage medium side with respect to the outer flexible fingers. Therefore, when an inertial force (F=mα) is applied to the slider due to the seek acceleration α, the above-mentioned outer flexible finger portion is deformed in a direction in which Δh is further increased.

As mentioned above, in the conventional transducer support device, the effective point m of the theta direction force on the slider is
There was a problem in that insufficient consideration was given to the large distance from the center of mass G of the slider, resulting in a large drop in flying height during seek.

An object of the present invention is to provide a transducer support device that reduces the minimum flying height of the transducer mounting means during seek and reduces the possibility of contact between the transducer mounting means and the storage medium.

An object of the present invention is to provide a transducer support device that reduces the minimum flying height of a slider during seek and reduces the possibility of contact between the slider and a storage medium.

[Means for solving problems]

In the transducer support device of the present invention.

In the flexible structural support to which the slider is attached, the air bearing surface of the slider forms the joint end of the substantially flexible part of the rigid structural support with the slider mounting part side end of the substantially flexible part. It is constructed so as to be close to the flat side.

[Effect]

During a seek, a rotational moment and a shearing force are applied to the flexible portion of the flexible structural support due to the seek acceleration. The change in flying height due to the inclination of the flexible portion due to this shearing force acts in the direction of reducing the minimum flying height due to the inclination of the flexible portion due to one rotational moment. This allows the slider to.

Decrease in flying height during seek is reduced.

〔Example〕

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

FIG. 1 is a side view of one embodiment of the transducer support device of the present invention, showing a state where it is attached to a rotary storage device. Reference numeral 61 denotes a storage medium, and a shaft (not shown) on the right side of FIG. It is attached to and rotates. A transducer 2 is mounted on an air bearing slider 3 (hereinafter referred to as slider 3) as transducer mounting means. The 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 the screw 10 to the guide arm 9 at the connecting part 8 at the other end of the elastic part 6.
It has been concluded. The slider 3 has an air bearing surface 11 and is floated by the bearing action of an air film formed between the air bearing surface 11 and the storage medium 1 that rotates once. A load protrusion 12 is disposed between the slider mounting portion of the flexible structure support and the rigid structure support 5.

FIG. 2 is a plan view of the flexible structural support 4 portion of the transducer support device of the present invention. Reference numeral 13 indicates a joint with the rigid structural support 5, and 14 indicates a spot welding point for joining. A flexible finger 15 is connected to the joint 13 at an end B on the access side, and the other one is connected to a substantially rigid step 17 at an end C on the slider side. Reference numeral 16 denotes a horizontal frame which connects the flexible finger portion 17 via the stepped portion 17, and further extends from the horizontal frame 16 with a mounting portion 18 to which the slider 3 is attached. The load protrusion 12 is formed by a recess provided in the mounting portion 18. The inner width W of the flexible finger portion 15 is set to be larger than the maximum width W of the portion of the load beam portion 7 that faces it. In FIG. 1, the height Qb of the load protrusion 12 from the slider mounting surface is formed lower than the height of the step 17 of the flexible finger from the slider mounting surface, and The angle 0 formed with the plane formed by the air bearing surface 11 is set to 0''. Also, the access side end B of the flexible finger
is set closer to the plane formed by the air bearing surface 11 than the end C on the slider side.

FIG. 3 is a diagram for explaining the operation of this embodiment, and shows the slider 3. Flexible structural support4. A side view of a portion of the rigid structural support 5 is filled with relevant parameters. In Figure 1,
The operation of this embodiment when the transducer support device is performing a seek operation with an acceleration of α in the radial direction will be described. When the transducer support device moves in the illustrated direction with acceleration α, an inertial force F=mα acts on the center of mass G of the slider 3 in the illustrated direction. Slider 3. Since the rigidity of the adhesive layer 19° attachment part 181 step part 17 and load beam part 7 is sufficiently greater than the rigidity of the flexible finger part 15, the substantial flexible part deformed by the inertial force is at point B. It can be said that there is only a flexible finger portion 15 with a length QO from 0 to 0. Now,
The deformation of the flexible finger portion 15 is determined. The applied forces are shearing force Fs and bending moment Ma, respectively (8),
Since it is expressed by equation (9), the inclination angle ic of the flexible finger portion 15 at the zero point is expressed by equation (10).

Fs=ma...(8
)MG=ma (Q1+Qs)-ki=1
9) x c = l s + x m
-(10) where is is 0 due to shear force Fs
The inclination angle, i, of the flexible finger 15 at the point is the inclination angle of the flexible finger 15 at the 0 point due to the bending moment Mo, and is expressed by equations (11) and (12), respectively.

Here, masin66Qo" EIa Ia However, i is the inclination in the rolling direction of the slider 3 when the initial minimum flying height of the flying surface 11 of the slider 3 changes by ±Δh due to the movement of the transducer support device at the acceleration α. , and k is the restoring spring constant of the air bearing action.

As mentioned above, the deformation from point 0 to point G can be ignored, so ic”f...(1
3), and therefore, the flying height reduction amount Δh due to seek is expressed by equation (14).

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

Here, considering that Δh is approximately expressed by equation (16).

In this embodiment, the end B on the access side of the flexible finger 15 is formed closer to the air bearing surface 11 than the end C on the slider side so that the deformation is due to the shear force is canceled out by the deformation i due to the moment. It is configured to be close to a plane, that is, so that δ is negative.

Further, the portion of the load beam portion 7 facing the flexible finger portion 15 is configured to be parallel to the air bearing surface 11.

〔Effect of the invention〕

According to the present invention, the load beam portion is kept parallel to the plane formed by the air bearing surface, and the end of the flexible finger on the access mechanism side is set in a plane formed by the air bearing surface, which is lower than the end portion of the flexible finger on the slider side. Since the mounting part of the support device can be brought close to the surface of the storage medium, the radial movement of the transducer due to movement perpendicular to the surface of the storage medium can be minimized, while at the same time the slider levitation caused by the seek operation can be minimized. Two things can be done to reduce the decrease in volume.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the transducer support device of the present invention, FIG. 2 is a plan view showing details of the flexible structure support of FIG. 1, and FIG. 3 is a side view of an embodiment of the transducer support device of the present invention. It is an operation explanatory diagram. 1...Storage medium, 3...Air bearing slider.

Claims (1)

[Scope of Claims] 1. A rigid arm connected to the access mechanism, an elastic part attached to the rigid arm and adjacent to the rigid arm, and a free end connected to the elastic part at the distal end side. a rigid structural support having a load beam portion that provides a loading force; a flexible structural support attached to a free end side of the rigid structural support; and transducer mounting means attached to the flexible structural support. , the load beam portion of the rigid structural support is parallel to a plane formed by the air bearing surface of the transducer mounting means, and the flexible structural support has two flexible beams extending in the longitudinal direction of the rigid structural support. It has a horizontal frame that connects the sex finger and the extended tips of the two flexible fingers via a step, and a tongue-shaped attachment part that extends from the horizontal frame. The transducer mounting means is joined to each other, and the rigid arm side end of the flexible part of the flexible finger part is configured to be closer to the plane formed by the floating surface of the transducer mounting means than the tongue-like attachment part side end. and a load protrusion disposed between the rigid structural support and the tongue-like attachment part of the flexible structural support, for transmitting a load force from the free end of the rigid structural support to the tongue-like attachment part. A transducer support device comprising: