JPS63234469A - Transducer supporting device - Google Patents

Abstract

PURPOSE:To reduce the floating amt. reduction of a transducer mounting means at seek time by approaching the end of the joining part of the rigid structure supporting body of an actually flexible part for the slider fit part side end of an actually flexible part to the plane face side forming the floating face of a slider. CONSTITUTION:A rigid structure supporting body 5 has an elastic part 6 and load beam part 7 and is bound by a screw 10 to a guide arm 9 at the combination part 8 of the other end of the elastic part 6. A slider 3 has a floating face 11 and is floated by the bearing action of the air film formed between a rotating memory medium 1 and the floating face 11, and approaches the joining part 13 side terminal B of a flexible finger part 15 to the plane 20 formed by the floating face 11 more than the terminal C at a step part 17 side. Therefore the rotary moment and shearing force are acted by seek acceleration at seeking time on the flexible part of a soft structure supporting body. The slider is thus reduced at its reduction in the floating amt. of seeking time.

Description

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

(Prior Art) A rotating storage device, as disclosed in Japanese Patent Publication No. 58-22827, includes a rotating storage medium and a transducer that reads and writes information while floating on the storage medium. A user, a transducer support device for supporting the transducer, and an access mechanism for accessing and retaining the transducer at any desired radial location 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 having an elastic part 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. This outer flexible finger is formed parallel to the central tongue and therefore also parallel to the plane formed by the air bearing 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 refers to measurement with a resolution of μm or higher.

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 major cause of problems. . 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 minimum flying height during seek will be larger than before, sufficient consideration must be given to reducing the flying height during seek.

Next, the conventional way of thinking about the cause of floating and lowering during seek will be explained.

When a force F in the theta direction is transmitted from the flexible structural support to the slider, 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 Mo is calculated as follows: Ma=FQ ・・・(1
) 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 i.
...Balanced with (2), where k is the restoring spring constant.

Here, Δh=Qzi
...(3) F=mα
...From (4), the above Δh is.

Δh = Q 2 Q t
...(5) Represented by k. 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.1 We developed a transducer support system for various slider masses m and arm lengths α 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 substantial application of the theta direction force F on the slider to the center of mass G, and Δh is expressed as L > 01
...(7) was found.

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. In other words, the center of mass G of the slider is located on the storage medium side with respect to the outer flexible fingers. For this reason, 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 of application of the theta direction force on the slider is
Insufficient consideration was given to the fact that the slider is far away from the center of mass G, resulting in a large drop in flying height during seek. There was a 11r problem.

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. .

A means to solve a problem] 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 caused by the inclination of the flexible portion due to the shearing force acts in a direction to reduce the minimum flying height caused by the inclination of the flexible portion due to the rotational moment. This reduces the drop in flying height of the slider 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 one embodiment of the transducer support device of the present invention, shown attached to a rotary 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. 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 the slider 3 is floated by the bearing action of an air film formed between the rotating storage medium 1 and the air bearing surface 11. A load protrusion 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. As shown in FIG.

Reference numeral 13 indicates a joint with the rigid structural support 5, and 14 indicates a spot welding point for joining. Reference numeral 15 denotes two flexible fingers, which extend on the same plane as the joint part 13, and whose width W is wider on the joint part 13 side because the width W of the flexible structure support 4 changes; It narrows on the sides. The horizontal frame 16 connects the two flexible finger portions 15 15 via a stepped portion 17 .

Reference numeral 18 denotes a mounting portion, which has a tongue shape extending from the horizontal frame 16;
The slider 3 is attached here. The load protrusion 12 is formed by a recess provided in the mounting portion]8.

FIG. 3 is a side view showing the details of the relative relationship between the slider 3, the flexible structural support 4, and the load beam section 7 when they are attached to the rotating body storage device.

In this embodiment, the 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 end C on the step portion 17 side.

FIG. 4 is a diagram for explaining the operation of this embodiment, and is a diagram for explaining the operation of 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 direction shown with an acceleration α, the center of mass G of the slider 3 has an inertial force F = mα
acts in the direction shown. Air bearing slider 3. Contact M layer 19. Since the rigidity of the mounting part 182, the step part 17, and the load beam part 7 is sufficiently greater than the rigidity of the flexible finger part 15, the substantial flexible part deforms due to the inertial force from point B to 0. Flexible fingers 15 with length QQ to the point
Only.

Here, point B is the boundary where the width W of the flexible finger portion 15 rapidly increases toward the joint portion 13 side, and point 0 is the boundary where the width W of the flexible finger portion 15 increases rapidly toward the joint portion 13 side.
It can be used as the edge on the second side. Now, the deformation of the flexible finger portion 15 is determined. The applied forces are the shearing force Fs and the bending moment Mo, which are expressed by equations (8) and (9), respectively, so the inclination angle ic of the flexible finger 15 at the 0 point is (10
) becomes the formula.

Fs=mα...(8)
Mm = ma (fiz+Qa) -ki
−(9)ic=xs=1m
---(to) where is is 0 due to shear force FS
The inclination angle of the flexible finger 15 at a point, 1 m, is the inclination angle of the flexible finger 15 at the 0 point due to the bending moment, and is expressed by equations (11) and (12), respectively.

However, i is the initial minimum flying height of the air bearing surface 11 due to the movement of the transducer support device at an acceleration α of ±Δ
This is the inclination of the slider 3 in the rolling direction when it changes by h, and k is the restoring spring constant of the air bearing action. Further, X is the distance along the flexible finger portion 15 from point B, E, and Ia.

δ is the local longitudinal elastic modulus of the flexible finger portion 15, respectively.

Local moment of inertia and air bearing surface 11 of slider 3
is the local inclination angle with respect to the plane 20 formed by .

As mentioned above, the deformation from point 0 to point M can be ignored, so 1c=i...(1
3), and therefore, the minimum flying height Δh due to seek can be expressed by equation (14).

... (14) In this embodiment, the terminal end point B of the flexible finger section 15 that is connected to the joint section is made slider than the terminal end point C that is continuous to the step section of the flexible finger section 15. A plane 20 formed by the air bearing surface 11
, the local inclination angle δ is negative.

Further, the width W of the flexible structure 4 is widened on the joint portion 13 side and narrowed on the horizontal frame 16 side.

FIG. 5 shows a flexible structural support 4 in a second embodiment of the present invention.
FIG. The second embodiment differs from the first embodiment only in the planar shape of the flexible structural support.
The width W of 5 is narrower on the joint portion 13 side and wider on the horizontal frame 16 side. Therefore, the ratio of the inclination angle is due to the shear force Fs becomes larger than the inclination angle 1 m due to the moment M, and there is an effect that the floating and sinking amount can be reduced more effectively than in the first embodiment.

According to the embodiment described above, since the local inclination angle δ□ is negative, the floating and sinking amount Δhs at the time of seek due to the deformation of the flexible finger portion 15 due to the shear force is Since it can be made negative, Δh can be made smaller by this amount.

Further, since the cap W of the flexible structural support 4 is made wider on the side of the joint 13, the connection with the rigid structural support 5 can be performed with sufficient reliability. Since it is narrower on the 17 side, it is less likely to be vibrated by the airflow caused by the rotation of the disk.The above two effects work together to reduce the possibility of contact between the slider and the storage medium, resulting in high reliability. storage can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reduce the reduction in the flying height of the transducer mounting means during the seek operation, and thus it is possible to obtain a highly reliable device.

[Brief explanation of the drawing]

FIG. 1 is a side view of one embodiment of the transducer support device of the present invention, FIG. 2 is a plan view showing details of the flexible structure support shown in FIG. 1, and FIG. 3 is a side view of an embodiment of the transducer support device of the present invention.・Side view showing details of the slider, flexible structural support and load beam,
FIG. 4 is an explanatory diagram of the operation of one embodiment of the present invention, and FIG. 5 is a plan view of a flexible structure support in another embodiment of the device of the present invention. DESCRIPTION OF SYMBOLS 1...Storage medium, 3...Slider, 4...Flexible structure support body. 5... Rigid structural support, 6... Elastic part, 7... Loading bead f l Figure B --- Stirring? f' 2O---4JJi//
7-Shape 1x. Go I? 1 Ubakuryo 5 Figure 4 - 11 Jumaki 1 Moment body 12 - 1 Ryō Hotaru protrusion Zu γ 13 - 11 Poetry Goju 15 - 'Ja+Fusho P t6 - # @ Comment I7 --- Throwing part 1g-m--p

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 extends in the longitudinal direction of the rigid structural support and perpendicular to the access direction. two flexible fingers having different bending stiffnesses in the access direction about an axis parallel to the plane formed by the air bearing surface of the transducer mounting means;
It has a horizontal frame that connects the extended ends of the two flexible fingers via a step, and a tongue-shaped attachment part that extends from the horizontal frame, and the tongue-shaped attachment part has a transducer mounting means. and configured such that the side end of the rigid arm part of the flexible part of the flexible finger part is closer to the plane formed by the floating surface of the transducer mounting means than the side end of the tongue-shaped attachment part; a load protrusion disposed between a structural support and a tongue-like attachment portion of the flexible structural support for transmitting a load force from the free end of the rigid structural support to the tongue-like attachment portion; Support device.