JP3223200B2 - Floating magnetic head slider - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating magnetic head slider which floats on a magnetic disk and performs magnetic recording / reproduction in a fixed magnetic disk drive.

[0002]

2. Description of the Related Art In recent years, an external storage device of a computer has
Due to its high speed and large capacity, fixed magnetic disk drives have been widely used. Further, in order to realize a small-sized fixed magnetic disk device having a larger capacity, a higher bit density is required along a magnetic recording track aiming at a higher magnetic recording density. A high bit density requires a narrower magnetic conversion gap for the magnetic head in order to operate in a small area of the recording wavelength, and a smaller gap (hereinafter referred to as a flying height) between the magnetic conversion gap and the magnetic disk must be used. Is happening. However, when the flying height is lower, the magnetic disk and the slider are more likely to come into contact with each other, and the possibility of destroying the recording surface of the magnetic disk is increased. Therefore, it is desired that the floating magnetic head having these air bearing surfaces keep the flying height low and constant.

FIG. 7 is a perspective view showing a configuration of a conventional floating magnetic head slider called a tapered flat slider, and FIG. 8 is a plan view showing a plane shape of an air bearing surface of the slider of FIG. The slider 1 is generally composed of two air bearing surfaces 2, a recessed region 3 between the air bearing surfaces, and a tapered portion 4 formed at the front end of the side air bearing surface. The rear end of the air bearing surface 2 has a magnetic conversion gap 5.

[0004]

FIG. 9 is a side view showing a floating state of a magnetic disk facing a floating magnetic head. As shown in FIG.
Flies at a predetermined pitch angle θ with respect to the magnetic disk 8,
The air outflow end of the air bearing surface on which the magnetic conversion gap 5 is mounted has the smallest flying height with respect to the magnetic disk 8.

However, in the slider 1 shown in FIG. 7, it is known that the pitch angle θ is reduced in a region where the flying height is small, the allowable amplitude for vibration is reduced, and the vibration damping characteristic is deteriorated. Therefore, there is a problem that the magnetic disk 8 and the slider 1 are likely to come into contact with each other in a region where the flying height is low, and the possibility of destroying the recording surface of the magnetic disk is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a floating type magnetic head slider which stably flies in a small flying height area without causing a decrease in pitch angle.

[0007]

In order to achieve the above object, the present invention provides a floating type magnetic head slider floating above the surface of a magnetic disk, wherein the slider is spaced apart from the surface of the magnetic disk surface in the lateral direction. Forming four or more air bearing surfaces extending longitudinally from the air inflow direction,
At least two air outflow ends on the inner side of the air bearing surface are formed closer to the air inflow end than the air outflow ends of the other outer air bearing surfaces.

[0008]

According to the present invention, the floating type magnetic head slider having the above-described air bearing surface shape has a large pitch angle of the air bearing surface with respect to the magnetic disk even in a region where the flying height is small, and has a large allowable amplitude against vibration and vibration. The attenuation characteristics can be improved. Therefore, even if the flying height is low, the possibility of destroying the recording surface of the magnetic disk is low, and it is possible to realize a fixed magnetic disk device having high magnetic recording density and high reliability at the same time.

Furthermore, the pressure profile at the air inflow end can be adjusted without changing the pressure profile near the air outflow end, which has a particularly large effect on the flying height of the magnetic conversion gap, and the flying height of the magnetic conversion gap can be kept low. Since the pitch angle can be adjusted while being held, the pitch angle and the flying height can be set independently, so that the time required for design can be shortened and the cost can be kept low.

[0010]

FIG. 1 is a perspective view showing the structure of a first embodiment of the present invention, FIG. 2 is a plan view showing the plane shape of the air bearing surface of the slider of FIG. 1, and FIG. 3 is aa of FIG. FIG. 3 is a longitudinal sectional view taken along the line ′. Referring to these drawings, two outer air bearing surfaces 6 extending from a front end A to a rear end B of the slider 1 and a front end A of the slider 1 located inside the outer air bearing surface 6 are described. Of the inner air bearing surface 7 extending from the inner air bearing surface 7 to the center of the slider 1 in the longitudinal direction, a depressed region 9 formed between the outer air bearing surface 6 and the inner air bearing surface 7, and two inner air bearing surfaces 7. A recessed region 10 formed therebetween, a tapered portion 11 formed at the front end A of the two outer air bearing surfaces 6, and a tapered portion 12 formed at the front end of the two inner air bearing surfaces 7. And a tapered portion 13 formed at the rear end of the inner air bearing surface 7, and has a magnetic conversion gap 5 at the rear end of the outer air bearing surface 6.

The outer air bearing surface 6 is the same as that shown in FIG.
Similarly to the above, since the air bearing surface is formed up to the air outflow end of the rear end portion B of the slider 1, the pressure profile near the air outflow end which has a particularly large effect on the flying height of the magnetic conversion gap 5 is affected. . Therefore, the width W1 of the outer air bearing surface 6 shown in FIG. 2 can set the flying height of the magnetic conversion gap 5 to a desired value.

The inner air bearing surface 7 has a length L near the air inflow end of the front end A of the slider 1 which has a particularly large influence on the flying height of the magnetic transducing gap 5 with respect to the outer air bearing surface 6. Since no surface is formed, the flying height of the magnetic conversion gap 5 is largely controlled by the width W1 of the outer air bearing surface 6. However, since a floating force is generated on the air inflow end side of the front end portion A of the slider 1, the pitch angle of the slider 1 is greatly affected. In other words, the pitch angle can be made large while the flying height of the magnetic conversion gap 5 is kept low, the allowable amplitude for vibration is large, and the vibration damping characteristics can be improved. Therefore, even if the flying height is low, the possibility of destroying the recording surface of the magnetic disk is low, and it is possible to realize a fixed magnetic disk device having high magnetic recording density and high reliability at the same time.

The pitch angle is adjusted by adjusting the inner air bearing surface 7.
And the design can be performed independently of the flying height, so that the time required for the design can be shortened and the cost can be kept low.

Referring to FIG. 3, the cross-sectional shape of the rear portion of the inner air bearing surface 7 is a tapered shape 13 following the rear end portion B of the slider 1. Therefore, the shape of the present embodiment can be manufactured by grinding using a conventional grindstone, the increase in manufacturing cost can be minimized, and a floating magnetic head having stable flying characteristics in a low flying area. Can be provided at low cost.

FIG. 4 is a perspective view showing the structure of a second embodiment of the present invention, FIG. 5 is a plan view showing the plane shape of the air bearing surface of the slider of FIG. 4, and FIG. 6 is aa 'of FIG. FIG. 3 is a longitudinal sectional view along a line. Referring to these drawings, the difference from the first embodiment is that the rear portion of the inner air bearing surface 7 does not have a tapered shape as shown in FIGS. It has a stepped shape having a substantially vertical vertical wall 7A. Therefore, the shape of the present embodiment cannot be manufactured by grinding using a conventional grindstone, but the floating characteristics are not inferior to the excellent floating characteristics of the first embodiment. While keeping the flying height of the magnetic conversion gap 5 low, the pitch angle can be made large, the allowable amplitude for vibration is large, and the vibration damping characteristics can be improved. for that reason,
Even if the flying height is low, the possibility of destroying the recording surface of the magnetic disk is low, and a high-reliability fixed magnetic disk device with high magnetic recording density can be realized.

[0016]

As described above, in the floating type magnetic head slider of the present invention, the pitch angle of the air bearing surface with respect to the magnetic disk can be made large even in a region where the flying height is small, the allowable amplitude for vibration is large, and the vibration damping characteristic is high. Can be improved. Therefore, even if the flying height is low, the possibility of destroying the recording surface of the magnetic disk is low, and it is possible to realize a fixed magnetic disk device having high magnetic recording density and high reliability at the same time.

Also, the pressure profile at the air inflow end can be adjusted without changing the pressure profile near the air outflow end, which has a particularly large effect on the flying height of the magnetic conversion gap, and the flying height of the magnetic conversion gap and the pitch angle can be adjusted. Can be set independently, so that the time required for design can be shortened and the cost can be kept low.

Furthermore, the shape of the first embodiment can be manufactured by grinding using a conventional grindstone, minimizing the increase in manufacturing cost, and achieving stable flying characteristics in a low flying area. The floating magnetic head slider can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a plan view showing a plane shape of an air bearing surface of the floating magnetic head slider of FIG. 1;

FIG. 3 is a longitudinal sectional view taken along the line aa ′ of FIG. 2;

FIG. 4 is a perspective view showing a configuration of a second exemplary embodiment of the present invention.

FIG. 5 is a plan view showing a plane shape of an air bearing surface of the floating type magnetic head slider of FIG. 4;

FIG. 6 is a longitudinal sectional view taken along line aa ′ of FIG. 5;

FIG. 7 is a perspective view showing a configuration of a conventional floating magnetic head slider.

8 is a plan view showing a plane shape of an air bearing surface of the conventional floating magnetic head slider of FIG. 7;

FIG. 9 is a side view showing a floating type magnetic head slider flying above a magnetic disk.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Slider 5 ... Magnetic conversion gap 6 ... Outer air bearing surface 7 ... Inner air bearing surface 7A
... vertical wall, 8 ... magnetic disk, 9, 10 ... recessed area, 11, 12, 13 ... tapered part.

Claims (1)

(57) [Claims] 1. A floating type magnetic head slider flying above a surface of a magnetic disk, wherein four or more air lines extending in a longitudinal direction from an air inflow direction at intervals in a lateral direction on a surface facing the magnetic disk surface. Having a bearing surface,
A floating magnetic head slider, wherein at least two air outflow ends on the inner side of the air bearing surface are located closer to the air inflow end than the air outflow ends of the other outer air bearing surfaces.