JPH03230378A - Device for supporting magnetic head - Google Patents

Abstract

PURPOSE:To prevent the generation of collision between a head slider and a magnetic disk by forming a recessed part on the back of the head slider and setting up the loading position of a supporting spring mechanism t the head slider in the vicinity of the centroid position of the head slider. CONSTITUTION:A groove 31 to be the recessed part is formed on the back 29 of the head slider 3 in the arrow A direction to be a traveling direction against the rotation of a magnetic disk and a position including the centroid of the slider 3 is set up on the bottom 33 of the groove 31. Even if any disturbance is applied to a head assembly 1 during the period of recording or reproducing, bending moment in the rolling direction due to load is hardly generated in the slider 3 because the application point of load applied from a load spring 21 to the slider 3 is close to the centroid of the slider 3. Thereby, the slider 3 is hardly inclined from the magnetic disk even if disturbance is applied, so that the slider 3 can be stably floated and a floating face 25 can be prevented from colliding with the recording face.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a magnetic head support device that suppresses and supports a head slider with respect to a magnetic disk.

(Prior Art) As shown in FIG. 8, a magnetic head assembly 101 in a magnetic disk device includes a head slider 103 made of soft ferrite or ceramic, and a back surface 104 that is a flat surface of the head slider 103. The head slider 103 is supported by a support spring mechanism 109 that elastically presses and biases the head slider 103 toward the recording surface 107 of the magnetic disk 105. A magnetic core 113 having a coil 110 wound thereon and a magnetic cap 111 formed thereon is provided at one end of the head slider 103 .

The head assembly 101 is attached to an actuator arm 115 of a magnetic disk device, and the actuator arm 115 is swingable around a rotation axis (not shown), and the actuator arm 11 is driven by a drive motor (not shown).
5 is swung, and the head slider 103 is moved to any position on the recording surface 107 of the magnetic disk 105.

The support spring mechanism 109 includes a substantially triangular load spring 121 that attaches a base mount portion 119 to the actuator arm 115, and a gimbal spring 123 that is provided at the tip of the load spring 121 and that adheres the head slider 103. Consisting of

Such a support spring mechanism 109 supports the head slider 103.
Head slider 1
The air bearing surface 125 of 03 is compared to the magnetic disk 10 in a stationary state.
The recording surface 125 of the magnetic disk 105 is brought into pressure contact with the recording surface 107 of the magnetic disk 105 at a predetermined rotational speed so as to make the air bearing surface 125 float.

This floating motion is a movement that occurs when the airflow accompanying the rotation of the magnetic disk 105 is forced into a wedge-shaped gap formed between the flying surface 125 of the head slider 103 and the recording surface 107 of the magnetic disk 105. done by pressure.

In FIG. 9, a head slider 103 or a magnetic disk 105 is shown.
A front view schematically showing a state in which the robot is floating on the ground.

In FIG. 9, reference numeral 127 indicates a slider for rectifying the air flow. The head slider 103 is operated mainly by the load W trying to approach the magnetic disk 105 due to the elasticity of the load spring 121 and the dynamic pressure generated due to the airflow pushed into the gap between the air bearing surface 125 and the recording surface 107. The floating blades w, , w2 are received.

By the way, with the recent strong demand for increased storage capacity per unit volume of magnetic disk drives, it has become necessary to make the entire device lighter, thinner, and smaller.For this reason, the height H of the head slider 103 is made as small as possible. Also, the floating surface 125
The flying height, which is the gap between the recording surface 107 and the recording surface 107, is also on the order of submicrons, but this is becoming increasingly smaller.

As a result, even if the head slider 103 is slightly tilted with respect to the magnetic disk 105 during recording or reproduction, there is a risk that the air bearing surface 125 will come into contact with the recording surface 107 on the tilted side.

(Problem to be Solved by the Invention) In such a magnetic disk device, the point of action P of the load W applied to the head slider 103 by the support spring mechanism 109 is on the flat back surface 104, and It is eccentric from the center of gravity G of the slider 103 by a dimension e in the vertical direction.

Therefore, when the line of action of the load W deviates from the center of gravity G due to disturbances being applied to the head assembly 101, the bending moment due to this load W acts on the head slider 103, causing the head slider 103 to roll with respect to the magnetic disk 105. It will be tilted.

For example, in FIG. 9, when the line of action of the load W deviates to the right of the center of gravity G, a clockwise bending moment will be applied to the head slider 10.
3, the right side of the air bearing surface 125 contacts the recording surface 107, and conversely, when the line of action deviates to the left side of the center of gravity G, a counterclockwise bending moment acts and the left side of the air bearing surface 125 contacts the recording surface 107. It will come into contact with surface 107.

In this way, in the conventional head assembly 101, the point of application P of the load W of the support spring mechanism 109 is on the head slider 10.
Since the hent slider 103 is off the center of gravity G of the magnetic disk 105, there is a problem that the hent slider 103 tilts during recording or reproducing operation and comes into contact with the air bearing surface 125 or the recording surface 107 of the magnetic disk 105.

Therefore, an object of the present invention is to prevent the flying surface of the head slider from coming into contact with the magnetic disk surface even if a disturbance acts on the head assembly.

[Structure of the Invention (Means for Solving the Problem) The structure of the present invention for solving the above problem is that a head slider is attached to the tip of a support spring mechanism attached to an actuator arm, and the head slider is connected to a magnetic disk. In a support device for a magnetic head, a recess is formed on the back surface of the head slider to expose the vicinity of the center of gravity of the head slider, and the tip of the support spring mechanism is positioned near the center of gravity. It is a combination.

(Function) During recording or reproducing operation, the load acting on the head slider from the support spring mechanism is near the center of gravity of the head slider in the recess formed in the head slider. For this reason,
Even if a disturbance is applied to the head assembly due to some force, there is almost no deviation between the point of application of the load and the center of gravity of the head slider, so almost no bending moment in the rolling direction is generated, and the head slider remains stable. It will surface.

(Example) Next, embodiments of the present invention will be described based on the drawings.

The head assembly 1 of the first embodiment, shown in a perspective view in FIG. 1 and in a side view in FIG. 2, includes a head slider 3 made of soft ferrite or ceramic, and a magnetic The support spring mechanism 9 elastically presses and biases the head slider 3 toward the recording surface 7 of the disk 5. head slider 3
A magnetic core 13 around which a coil 10 is wound and a magnetic gap 11 is formed is provided at one end.

The head assembly 1 is attached to an actuator arm 15 of a magnetic disk device.
The actuator arm 15 is oscillated by a drive motor (not shown), and the head slider 3 can perform a seek operation to any position on the recording surface 7 of the magnetic disk 5. be done.

The support spring mechanism 9 includes a substantially triangular load spring 21 that attaches the base mount portion 19 to the actuator arm 15, and a gimbal spring 23 that is provided at the tip of the load spring 21 and that adheres the head slider 3. Consisting of

A slider groove 27 is provided on the air bearing surface 25 side of the head slider 3.
A recess 31 is provided on the back surface 29 to which the gimbal spring 23 is connected, and the groove 31 is parallel to the direction of arrow A, which is the traveling direction of the rotating magnetic disk 5. is the center of gravity G of the head slider 3
The location includes.

The gimbal spring 23 is attached to the bottom surface 33 of the groove 31 by adhesive or other means, and is attached to the bottom surface 33 as necessary.
Form a pivot at 3 and attach gimbal spring 2 to this pivot.
3, the floating blades W1 and W2 acting on the left and right floating surfaces 25 can always be made equal, as shown in the schematic diagram of FIG.

Next, the operation of the head assembly 1 of the mechanism will be explained.

When the magnetic disk 5 is stopped, the load spring 21
Due to its elasticity, the air bearing surface 25 of the head slider 3 is in contact with the recording surface 7 of the magnetic disk 5.

When the magnetic disk 5 begins to rotate, an airflow accompanying the running of the magnetic disk 5 is pushed between the air bearing surface 25 and the recording surface 7, and the dynamic pressure generated when the magnetic disk 5 is pushed causes the head slider 3 to act as a load spring. It is pushed up against the magnetic disk 5 against the load W of 21, and the air bearing surface 25 floats against the recording surface 7. At a predetermined rotation, the floating blades W1 and W2 acting on the left and right floating surfaces 25 become equal, and the floating surfaces 25 become parallel to the recording surface 7.

When the actuator arm 15 is rotated one by one by a drive motor (not shown) and the magnetic gap 11 reaches a desired position on the recording surface 7, the magnetic field generated in the magnetic gap 11 causes recording on the recording surface 7 or Playback is performed from.

Even if some disturbance acts on the head assembly 1 during this recording or reproducing operation, the point of application P of the load W acting on the head slider 3 from the load spring 21 is near the center of gravity G of the head slider 3. Almost no bending moment in the rolling direction is generated in the head slider 3 due to the load W. Therefore, even if a disturbance occurs, the head slider 3 hardly tilts with respect to the magnetic disk 5, the head slider 3 flies stably, and collision of the flying surface 25 with the recording surface 7 is avoided. .

FIG. 4 shows a perspective view of the head assembly 41 of the second embodiment.

Components that are the same as those of the first embodiment shown in FIG.

In this second embodiment, the recessed portion of the back surface 43a of the head slider 43 coupled to the gimbal spring 23 is formed by a groove 42 substantially perpendicular to the running direction (direction of arrow A) of the head slider 43 relative to the rotating magnetic disk 5. The bottom surface 45 of the groove 42 is formed near the center of gravity G of the head slider 43.

In the head assembly 41 of this second embodiment, even if a disturbance acts as in the first embodiment, there is almost no deviation in the line of action of the load W with respect to the center of gravity G, as shown in the schematic diagram of FIG. A bending moment in the rolling direction is not generated for the head slider 43, and therefore, the risk of the head slider 43 colliding with the magnetic disk 5 due to disturbance is avoided.

Furthermore, in this second embodiment, the area of the end surface 44 of the head slider 3 for forming the magnetic core 13 is sufficiently secured without being reduced by the groove 42, when the area is particularly required for electromagnetic conversion characteristics. It is particularly effective because it

FIG. 6 shows a perspective view of the head assembly 51 of the third embodiment.

Components that are the same as those of the first embodiment shown in FIG.

In the second third embodiment, a concave portion in the back surface 53a of the head slider 53, which is connected to a gimbal spring (not shown) near the center of gravity of the head slider 53, is formed in a direction in which the head slider 53 travels with respect to a rotating magnetic disk. (Arrow A
It is constructed by a diagonal groove 52 forming an angle θ with respect to the direction (direction).

The head assembly 51 of this third embodiment also avoids the risk of the head slider 53 colliding with the magnetic disk even if a disturbance acts as in the first embodiment. In addition, the area of the end face 54 forming the magnetic core 13 of the head slider 53 required for electromagnetic conversion characteristics is sufficiently secured.

Further, as shown in FIG. 7, a circular recess 67 may be formed on the back surface 65 of the head slider 63, or an elliptical or polygonal recess (not shown) may be substituted for the recess 67. The four parts may have various shapes as long as the bottom surfaces of these four parts are located near the center of gravity of the head slider and can be coupled to the gimbal spring.

[Effects of the Invention] As is clear from the above, according to the configuration of the present invention, by providing the recess on the back surface of the head slider, the load position on the head slider by the support spring mechanism is brought to the vicinity of the center of gravity of the head slider. As a result, even if a disturbance acts on the head assembly, the head slider flies stably without tilting, and collision of the head slider with the magnetic disk can be avoided.

[Brief explanation of drawings]

1, 4, and 6 are perspective views of head assemblies in first, second, and third embodiments of the present invention, and FIG. 2 is a side view of FIG. 1, and FIG. is a schematic front view of FIG. 1, FIG. 5 is a schematic front view of FIG. 4, FIG. 7 is a perspective view showing another embodiment of the head slider, and FIG. 8 is a perspective view of a conventional head assembly. , FIG. 9 is a schematic front view of FIG. 8. 3.43.53.63...Head slider 5...Magnetic disk 9...Support spring mechanism 15...Actuator arm 29.43a, 53a, 65...Back surface 3, 42.52
... Groove (recess) 67 ... Recess G ... Center of gravity

Claims (1)

[Claims] In a magnetic head support device in which a head slider is attached to the tip of a support spring mechanism attached to an actuator arm, and the head slider is supported by pressing against a magnetic disk with a predetermined pressing force, a recess is formed on the back surface of the head slider. 1. A magnetic head support device characterized in that the head slider is exposed near the center of gravity of the head slider, and the tip of the support spring mechanism is coupled to the center of gravity of the head slider.