JPH0612596B2 - Magnetic head support mechanism - Google Patents

Description

Description: (a) Technical Field of the Invention The present invention controls the position and orientation of a magnetic head support mechanism of a magnetic disk device, and in particular, the position of a head slider that is levitated from the disk surface by the airflow accompanying the rotation of the disk. The present invention relates to a magnetic head support mechanism.

(b) Background of technology Recently, the speed and density of magnetic disk devices have increased, and the distance between the disk and the head tends to become closer. Therefore, there is a strong demand for the development of a magnetic head support mechanism having a structure that enables high-speed tracking and can flexibly follow the waviness of a disk surface that rotates at a high speed to always keep a required minute interval and posture. .

(c) Conventional Technology and Problems FIG. 1 is a diagram for explaining the structure and operation of a conventional magnetic head support mechanism, in which (a) is a perspective view and (b) is a side sectional view. There is.

As shown in FIG. 1, the conventional magnetic head support mechanism includes a head slider 2 having a magnetic head, a gimbal 3 that supports the slider 2 in a balanced manner, and a pressure spring portion 4 that supports the gimbal 3. The pressurizing spring unit 4 operates the magnetic head support mechanism in accordance with an arrow B according to a command from a device control unit (not shown).
Alternatively, it is attached to the arm 5 which is a part of the head drive mechanism for seeking in the direction of the arrow B '. By the way, the head slider 2 provided with the magnetic head is in contact with the disk 1 (the interval Δ is “0”) when the disk apparatus is present, but the disk apparatus operates and the disk 1 moves in the direction of arrow A. When it is rotated in the direction of 1, the inclined surface 2'is pushed up in the direction of arrow C'by the air flow 10 which follows the disk 1 and flows in the direction of arrow C, and as shown in FIG. Surface. Therefore, it is well known that the head slider 2 and the disk 1 are opposed to each other with a predetermined minute gap Δ without contacting each other, and the magnetic head provided in the head slider 2 writes / reads to / from the disk 1. Is. However, in the conventional method described above, when the seek is performed at high speed to shorten the access time, the gimbal 3 and the pressure spring portion 4 are deformed, and the floating of the head slider 2 is disturbed by this deformation (this is due to the " The force by which the air flow 10 flowing in the direction of arrow C due to the effect of "swelling" pushes up the inclined surface 2'of the head slider 2 in the direction of arrow C'and the force of pushing up the head slider 2 in the direction of arrow D and the head slider 2 The balance of the force of pushing down in the direction of arrow F is lost, and the head slider 2 floats up in a posture inclined in the direction of arrow E, for example, and the reliability during writing / reading is hindered between the disk 1 and the head slider 2. (This refers to a phenomenon in which the flying angle error θ occurs). On the other hand, in order to prevent this, if the rigidity of the gimbal 3 and the pressure spring portion 4 is increased by increasing the thickness of the plate, for example, the head supporting portion loses its flexibility and the height direction and the torsion generated when the head is attached are twisted. Since the dimensional error in the direction cannot be absorbed, the attitude of the head slider 2 and the predetermined distance Δ between the disk 1 and the slider 2 become unstable, and the reliability of writing / reading of the device is hindered. Was becoming. Therefore, it is impossible to perform high-speed seek (tracking) with this conventional structure.

(d) Purpose of the invention The present invention has been made to correct the above-mentioned drawbacks.
An object of the present invention is to provide a magnetic head support mechanism capable of properly maintaining the posture and position of the head slider at the time of high speed seek by improving the structure of the pressure spring portion supporting the gimbal.

(e) Structure of the Invention According to the present invention, there is provided a head slider 2 that can fly above a magnetic disk 1, a gimbal 3 that supports the head slider 2, a gimbal 3 that supports the gimbal 3, and the head. In the magnetic head supporting mechanism configured by a leaf spring-shaped pressure spring portion 4 whose longitudinal direction is in the same direction as the head seek direction so that the slider 2 is pressed by the magnetic disk 1, This is achieved by providing a magnetic head support mechanism characterized in that the portion 4 is composed of a pair of parallel springs 14 facing each other at a predetermined distance.

(f) Embodiments of the Invention Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Before that, the essential points of the present invention will be described with reference to FIG.

To enable higher speed seek (tracking) in the magnetic disk device, 1- (1) reduce the mass of the moving part of the magnetic head + arm, 1- (2) shorten the stroke, 1
-(3) It is necessary to satisfy the three conditions of increasing the acceleration applied to this, and to stabilize the flying of the magnetic head, 2- (1) improve the flying characteristics of the head slider,
2- (2) Errors that occur when mounting the magnetic head (height,
It is necessary to satisfy three conditions, that is, the pressure spring portion 4 is made to be flexible so as to absorb the twist angle), and 2- (3) the vibration applied to the head slider 2 is reduced. The present invention is intended to improve 2- (2) and 2- (3) in order to realize 1- (3) above. Further, when mounting the magnetic head, as shown in FIG. 2, if an error is generated especially in the height direction H, a moment M is applied to the slider 2 to unbalance the head and make the head unstable, which is also improved by the present invention. Is the point.

3A and 3B are views showing an embodiment of the magnetic head supporting mechanism of the present invention based on the above-mentioned concept, where FIG. 3A is a plan view and FIG.
Is a side view and (d) is a sectional view taken along line YY '. FIG. 4 is a diagram for explaining the operation of the present invention, (a)
Is a side view and (b) is a front view. In these figures, the same parts as those in FIGS. 1 and 2 are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIGS. 3 (b) and 3 (c), the magnetic head supporting mechanism of the present invention has a pair of parallel spring structures arranged in a facing state with a predetermined gap G therebetween, thereby strengthening the torsional strength. Since the spring portion is provided with the pressure spring portion 4 having flexibility, the rigidity of the pressure spring portion 4 with respect to the torsion moment M and the flying characteristic of the head slider 2 are significantly improved. By doing so, the torsional moment M of the pressure spring portion 4 is increased as compared with the case where it is configured by a single spring.
Since the toughness with respect to is remarkably enhanced, it is possible to suppress the head tilt at the time of seek and the turbulence due to the wind.
Further, according to the pressurizing spring portion 4 of the present invention, the side surface of the pressurizing spring portion 4 is also formed in a substantially rectangular shape, as is apparent from FIGS. 3B and 4A, so that the head slider When 2 moves in the directions of arrows F and F ', the surface of the head slider 2 moves in parallel with the surface of the disk 1, so that no inclination occurs between these two surfaces.

FIG. 5 shows the pair of parallel springs constituting the pressure spring portion 4.
Vibration energy propagated from the outside by filling a viscoelastic body such as synthetic rubber between 14 and the vibration of the pressure spring part 4 itself, especially high-order vibration in which the wavelength falls within the size of the spring part. This is a modified example in which a damping layer 15 that damps mode vibration energy very effectively is interposed. The damping layer 15 damps the vibration of the head slider 2, and at the same time, from the device side to the head slider 2 via the arm 5. It has a structure that absorbs the transmitted vibration.

The magnetic head support mechanism according to the present invention has a pair of parallel spring structures arranged in a state of being opposed to each other with a predetermined gap G therebetween to enhance the torsional strength and improve the followability of the head slider 2 with respect to the disk surface. Since the pressurizing spring portion 4 is provided, the head slider 2 floats extremely stably. In addition, the magnetic head support mechanism (modification) in which the damping layer 15 made of a viscoelastic body is interposed between the pair of parallel springs 14 has a vibration and a pressure spring portion which are propagated from the outside to the pressure spring portion 4. Since the vibrations of 4 themselves are very effectively damped, the posture of the head slider 2 is not significantly disturbed even when a large acceleration is applied during the head seek.

(g) Effects of the Invention As described in detail above, in the magnetic head support mechanism of the present invention, the head spring 2 has the "flapping" because the pressure spring portion for supporting the head slider has a volume structure in the thickness direction. It is strong against "and twisting", and vibration damping is large, and resonance phenomenon can be suppressed, so the posture and position of the head slider can always be maintained properly with respect to the disk, and the speed and reliability of the magnetic disk device can be increased. The effect of doing so is enormous.

[Brief description of drawings]

FIG. 1 is a view for explaining a conventional magnetic head support mechanism, FIG. 2 is a view for explaining the main points of the present invention, and FIG. 3 is a view showing an embodiment of the magnetic head support mechanism of the present invention. FIG. 4 is a view for explaining the operation of the magnetic head support mechanism of the present invention, and FIG. 5 is a view showing a modification of the magnetic head support mechanism of the present invention. In the drawing, 1 is a disk, 2 is a head slider having a magnetic head, 3 is a gimbal, 4 is a pressing spring portion, 5 is an arm, 10 is an air flow, 14 is a pair of parallel springs, 15 is a damping layer, and Δ Is a predetermined gap between the disk 1 and the head slider,
G indicates a predetermined interval between the pair of parallel springs 14, respectively.

Claims (2)

[Claims] 1. A head slider (2) having a magnetic head and capable of flying above a magnetic disk (1), and the head slider.
A gimbal (3) supporting (2), and a magnetic disk that supports the gimbal (3) and also the head slider (2).
In the magnetic head support mechanism configured by a leaf spring-shaped pressure spring portion (4) whose longitudinal direction is the same direction as the head seek direction so as to be pressed to the (1) side, the pressure spring portion ( 4. A magnetic head support mechanism characterized in that 4) is composed of a pair of parallel springs (14) facing each other with a predetermined gap (G). 2. A damping layer (15) made of a viscoelastic material is provided between the pressure spring parts (4) composed of a pair of parallel springs (14). Magnetic head support mechanism.