JP3260396B2 - Magnetic recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording apparatus equipped with a negative pressure type flying slider.

[0002]

2. Description of the Related Art In recent years, various studies have been made to increase the density and capacity of a magnetic recording device as a file memory of a computer. In the magnetic recording apparatus, in the recording / reproducing operation, the magnetic head is separated from the surface of the magnetic disk by a constant gap due to the acting force of the airflow generated between the flying slider formed integrally with the magnetic head and the rotating magnetic disk. Emerging. As a feature of magnetic recording, in order to improve the recording density, it is desirable to make the magnetic head and the magnetic disk surface as close as possible, that is, to reduce the flying height. Therefore, in order to eliminate the contact between the magnetic head and the flying slider and the magnetic disk at the time of flying, the mirror lubrication is performed so that the roughness of the fluid lubrication surface of the flying slider and the surface of the magnetic disk are extremely small. . In addition, in order to obtain a stable flying state with a low flying height, use of a negative pressure type flying type slider (hereinafter referred to as a negative pressure slider) having excellent flying characteristics has been studied. The floating principle of the negative pressure slider is based on the fact that the acting force of the air current is fixed at an equilibrium position of the acting force that attracts the slider to the magnetic disk and the acting force that repels the slider. Therefore, unlike the conventional positive pressure type flying slider, there is a feature that it is not necessary for the supporting spring system of the negative pressure slider to bear the pressing load against the magnetic disk surface.

With the start / stop of the magnetic recording device,
Methods for shifting the flying slider between a flying state and a non-flying state include a contact start / stop method (hereinafter abbreviated as CSS) and a load / unload method. The CSS method is a method often used conventionally,
When the magnetic disk is not rotating and stationary, the fluid lubricating surface of the flying slider and the magnetic disk are in static contact. When the magnetic disk rotates, the flying slider moves to a flying state by fluid lubrication by dynamic pressure via a sliding state between the fluid lubrication surface of the flying slider and the magnetic disk. Further, when the rotation of the magnetic disk stops, the floating slider stops following sliding of the fluid lubricating surface of the floating slider and the magnetic disk and returns to a static contact state in accordance with a decrease in dynamic pressure.
In the CSS system, a magnetic disk having a lubricating soft organic material formed on the surface is used to prevent the magnetic disk from being worn or increased in frictional force due to repeated sliding of the magnetic lubrication surface of the flying slider and the magnetic disk. In order to prevent the fluid lubrication surface of the flying slider from sticking to the surface of the magnetic disk due to the influence of moisture in the operating environment and the lubricating soft organic material, the surface of the magnetic disk is textured to provide appropriate roughness, etc. Has been improved. On the other hand, in the load / unload system, the floating slider is separated from the surface of the magnetic disk when the magnetic disk is not rotating and stationary, and the floating slider is supported from the outside when the magnetic disk has reached a predetermined rotation speed. The floating slider approaches the magnetic disk surface by displacing the spring, and the floating slider moves to the floating state without passing through the sliding state with the magnetic disk. In the separation of the flying slider, the support spring is separated to the initial position in a state where the magnetic disk is rotated or the number of rotations is reduced. When the floating slider is a negative pressure slider, the negative pressure slider can be separated from the magnetic disk only when the rotational speed of the magnetic disk decreases and the dynamic pressure for fixing the floating amount of the negative pressure slider decreases. It is possible. Utilizing the unique properties of this negative pressure slider, a bending load is applied to the support spring of the negative pressure slider in the direction of separation from the magnetic disk, and the support spring of the negative pressure slider is externally placed while the magnetic disk is rotating. By employing the load / unload method of pressing, the rotation of the magnetic disk is stopped, and the negative pressure slider is automatically separated from the magnetic disk by the return force of the support spring. As a support spring pressing mechanism for the negative pressure slider in the load / unload system, a mechanism for pressing a back surface of the support spring with a pressing pin driven by an electromagnetic solenoid has been devised.

[0004]

However, in the above-mentioned conventional CSS method, since the magnetic disk and the floating slider fluid lubrication surface are in static contact with each other, the magnetic disk and the floating slider fluid associated with higher recording density are required. Significantly affected by ultra-smooth lubrication surfaces. That is, the moisture and the lubricating soft organic matter on the surface of the magnetic disk cause sticking phenomenon between the fluid lubricating surface of the flying slider and the magnetic disk, which hinders the rotation of the magnetic disk upon starting the magnetic recording device. In addition, there is a possibility that the reliability may be remarkably lowered, for example, the flying type slider and its supporting spring system or the magnetic disk may be deformed and damaged. On the other hand, in the conventional load / unload method, the sticking phenomenon does not exist essentially. However, the CSS system requires a mechanism that operates by separately providing a pressing / separating mechanism, which is not necessary for the CSS method, and requires a mechanism that operates in synchronization with the rotation of the magnetic disk. There has been a problem such as a reduction in the size or a complicated mechanism, which hinders downsizing of the magnetic recording apparatus incorporating the mechanism.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and eliminates the sticking phenomenon between the magnetic disk and the negative pressure slider, and ensures that the negative pressure slider is shifted to the floating state with a simple structure. It is an object of the present invention to provide a magnetic recording apparatus which can make a transition from a floating state to a non-flying state, makes it possible to lower a flying height of a negative pressure slider, and can increase a recording density.

[0006]

In order to achieve this object, a magnetic recording apparatus according to the present invention comprises a magnetic recording device which is stationary at a position near a front end edge of a fluid lubricating surface of the negative pressure slider .
Located in contact with the saw the magnetic disk, when the magnetic disk has reached a predetermined rotational speed, the negative pressure slider by torsion of the support spring by the action force of the air flow between the negative pressure slider and the magnetic disk It is configured to be displaced to a steady flying posture state.

[0007]

According to this structure, the contact area between the fluid lubricating surface of the negative pressure slider and the magnetic disk surface is small, so that the sticking phenomenon does not easily occur. Further, the air acting surface of the negative pressure slider is wide, so that the air flow is generated when the rotation of the magnetic disk starts. As a result, the negative pressure slider can be reliably shifted to the floating state with a simple structure, and can be shifted from the floating state to the non-flying state. Further, since the sticking phenomenon is prevented, the flying height of the negative pressure slider can be reduced, and high density recording can be achieved.

[0008]

An embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a side view of a main part of a negative pressure slider according to a first embodiment of the present invention in a non-floating state, and FIG. 2 is a side view of a main part in a floating state. 1 is a magnetic disk, 2 is a negative pressure slider made of a non-magnetic material, 3 is a fluid lubrication surface of the negative pressure slider, and 4 is a support spring connected to the gimbal. When the magnetic disk 1 is not rotating, the negative pressure slider 2 is placed in contact with the magnetic disk 1 at the front edge of the fluid lubrication surface 3, and the support spring 4 contacts the magnetic disk 1 with the front edge. Load is 0.0049N
It is supported to be. The separation distance between the rear edge of the fluid lubrication surface 3 and the magnetic disk 1 is 0.15 mm. The maximum surface roughness of the magnetic disk 1 is 5 nm, and the maximum surface roughness of the fluid lubricating surface 3 of the negative pressure slider 2 is 6 nm. The surface of the magnetic disk 1 is coated with a lubricating oil having a thickness of 2 nm. As described above, despite the fact that the mirror surface processing with extremely small roughness is performed, in the non-rotation state of the magnetic disk 1, the negative pressure slider 2 comes into contact with the magnetic disk 1 only at the front end peripheral edge of the fluid lubricating surface 3. Therefore, the coefficient of friction between the magnetic disk 1 and the negative pressure slider 2 was 0.08, and no sticking phenomenon occurred.

In FIG. 2, when the magnetic disk 1 rotates in the direction A, an air flow is generated between the magnetic disk 1 and the negative pressure slider 2. When the rotation speed of the magnetic disk 1 reaches 10S-1, the suction surface of the negative pressure slider approaches the magnetic disk and shifts to a floating state due to the suction force of the air flow. In the flying state, the separation distance between the magnetic disk 1 and the fluid lubricating surface 3, that is, the flying height was 0.1 μm. In the floating state, the negative pressure slider 2 is fixed in the floating state by the action of the air flow. The displacement between the initial state and the flying state of the negative pressure slider 2 is absorbed as torsion of the support spring 4. Next, when the rotational speed of the magnetic disk 1 is reduced from the floating state and the dynamic pressure acting on the fluid lubricating surface 3 of the negative pressure slider 2 is reduced, the negative pressure slider 2 is returned from the floating state by the torsion of the support spring 4. Return to the initial state of 1.

As described above, according to the present embodiment, since the fluid lubricating surface 3 of the negative pressure slider 2 does not adhere to the magnetic disk 1, the sticking phenomenon between the magnetic disk 1 and the negative pressure slider 2 does not occur. Is apparent, and the action of the air flow accompanying the rotation of the magnetic disk 1 moves the negative pressure slider 2 to a floating state. A mechanism for driving in synchronism can be omitted, and a small and simple mechanism can be used, and a reliable operation of shifting the negative pressure slider 2 between the non-floating state and the floating state can be obtained.

In this embodiment, the peripheral edge of the front end of the fluid lubricating surface 3 of the negative pressure slider is in contact with the magnetic disk surface. However, a part of the other peripheral edge of the fluid lubricating surface 3 is in contact with the magnetic disk. The same effect can be obtained even if it is located.

[0013]

[0014]

Embodiments 2 and 3 Hereinafter , second and third embodiments of the present invention will be described with reference to the drawings.

FIG . 3 is a side view of a main part of a negative pressure slider in a non-floating state according to a second embodiment of the present invention, FIG. 4 is a side view of a main part of the floating state, and FIG. FIG. 7 is a side view of a main part of the negative pressure slider in a non-floating state according to the third embodiment, and FIG. 6 is a side view of the main part at the time of floating. Reference numeral 6 denotes a negative pressure slider having a trapezoidal side surface and a front inclined upper surface with a rear portion inclined high toward the front, and 7 denotes a tongue from the support spring 4 of the negative pressure slider 2 to the front surface of the negative pressure slider 2 to the surface of the magnetic disk 1. These are tongue-shaped wings formed on the tongue.

[0017] Figure 4 by processing in this manner, FIG. 6
As shown in (1), the force acting on the negative pressure slider 2 against the magnetic disk 1 due to the rotation of the magnetic disk 1 against the magnetic disk 1 is greatly amplified, and the transition of the negative pressure slider to the floating state is further ensured. Is possible.

[0018]

As described above, according to the present invention, the negative pressure slider is in contact with the magnetic disk only at the front edge of the fluid lubrication surface,
When the magnetic disk reaches a predetermined number of revolutions, the negative pressure slider is displaced into a floating state by the action of the airflow between the magnetic disk and the negative pressure slider, so that the sticking of the fluid lubrication surface of the negative pressure slider and the magnetic disk occurs. Can be effectively prevented. As a result, the fluid lubrication surface of the negative pressure slider and the mirror surface of the magnetic disk are further advanced, the flying height of the negative pressure slider is further reduced, and high density magnetic recording can be realized. With a small and simple mechanism, the transition operation between the floating state and the non-floating state of the negative pressure slider can be reliably performed, making it possible to reduce the size, weight, and thickness of the device, reducing production costs and suitable for mass production. Thus, an excellent magnetic recording device having high operation reliability can be realized.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a negative pressure slider in a non-floating state according to a first embodiment of the present invention.

FIG. 2 is a side view of a main part of the negative pressure slider in a flying state according to the first embodiment of the present invention.

FIG. 3 is a side view of a main part of the negative pressure slider in a non-floating state according to a second embodiment of the present invention.

FIG. 4 is a side view of a main part of a negative pressure slider in a floating state according to a second embodiment of the present invention.

FIG. 5 is a side view of a main part of the negative pressure slider according to a third embodiment of the present invention in a non-floating state.

FIG. 6 is a side view of a main part of a negative pressure slider in a floating state according to a third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Magnetic disk 2 Negative pressure slider 3 Fluid lubrication surface of negative pressure slider 4 Support spring 6 Forward inclined upper surface 7 of negative pressure slider 7 Tongue-shaped blade A Magnetic disk and direction of air flow

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 21/21

Claims (1)

(57) [Claims] 1. A magnetic recording apparatus comprising: a support spring made of an elastic body; a gimbal connected to the support spring; and a negative-pressure floating slider fixed to the gimbal, wherein the magnetic disk is stationary. The support spring comes into contact with the magnetic disk only at the front end periphery of the fluid lubrication surface of the negative pressure type flying slider by the torsion of the support spring, and when the magnetic disk rotates, the fluid lubrication between the magnetic disk and the negative pressure type floating slider is performed. The magnetic recording apparatus according to claim 1, wherein said negative pressure type floating slider is displaced in attitude by a twist of said support spring and shifts to a floating state by an action force of an air flow between said slider and said surface.