JPH04325975A - Slider for magnetic disk - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slider for a floating magnetic disk in a magnetic disk device.

0002

2. Description of the Related Art In recent years, in order to realize high-density recording in magnetic disk drives, the flying height of a floating magnetic disk slider has been miniaturized. Magnetic disk sliders for magnetic disk devices are broadly classified into positive pressure type and negative pressure type.
The positive pressure type utilizes the buoyancy force generated on the slider by the airflow generated as the magnetic disk rotates, but the negative pressure type has both a positive pressure generation part and a negative pressure generation part on the slider surface, and is characterized by As the air film between the magnetic disk and the slider has high rigidity, the flying stability is good, and it is not easily affected by the external environment, so it is suitable for lower flying heights and is considered to be advantageous in realizing high-density recording. It is being

On the other hand, high-speed access is progressing in magnetic disk drives, and in order to achieve this, many magnetic disk drives adopt a swing arm system, and as a result, the head angle of the slider with respect to the airflow (hereinafter referred to as yaw angle) is large. It has become. The slider has side rails to generate levitation force, and it consists of an inner rail near the center of the disk and an outer rail located outside the inner rail with respect to the center of the disk. Due to the difference in linear velocity between both side rails, the flying height of the inner rail tends to be lower than that of the outer rail. This is one of the factors that increases the risk of head crash. Furthermore, as magnetic disk drives become more compact, the length of the swing arm becomes shorter, and as a result, the skew of the swing arm becomes larger, which increases the yaw angle of the slider, causing air to flow into the slider relative to the direction of movement of the magnetic disk. As the linear velocity of the flow decreases, the reduction in flying height is also increasing.

An example of a conventional negative pressure slider will be described below with reference to the drawings. FIG. 8 shows the shape of a conventional negative pressure magnetic disk slider. In FIG. 8, 31 and 32 are side rail parts, 33 is a cross rail part, and 34 and 35 are notch parts. The rail width x of the side rail 31 and the width y of the side rail 32 are equal.

The flying characteristics of the negative pressure magnetic disk slider constructed as described above will be explained below.

First, FIG. 13 shows the flying height at the air outlet end for the inner and outer rails when a conventional negative pressure magnetic disk slider is used in a 3.5-inch magnetic disk drive. . The magnetic disk in this example uses a swing arm system, and the opposite angle to the air inflow direction at the slider center position is the disk outer circumference r4, assuming that the direction of air inflow from the outer circumference side rail is positive.
The specifications are +5° at the inner circumference of the disk and -10° at the inner circumference of the disk r1. In addition, in FIGS. 9 to 12, radii r1 and r2 in FIG.
, r3, and r4, the relationship between the flying height and the yaw angle is shown. The influence of the flying height on the yaw angle differs between the inner and outer rails.

[0007]

[Problems to be Solved by the Invention] However, with the above shape, due to the difference in linear velocity between the inner and outer rails and the influence of the yaw angle due to the swing arm, the inner and outer rails are It can be seen from FIGS. 9 to 13 that there is a difference in the flying height between the two. It can be seen from this that the floating amount of the inner rail is generally lower than that of the outer rail. Therefore, there is a problem that the conventionally shaped slider has a high risk of head crash.

[0008] Also, from the point of view of linear recording density, it is desirable to arrange the electromagnetic transducer on the outer rail, which is advantageous, but in that case, the flying height must be set higher than that on the inner rail, which affects the electromagnetic transducer characteristics. This poses the problem of being at a disadvantage.

In view of the above-mentioned conventional problems, the present invention provides a negative pressure magnetic disk slider which aims to eliminate the difference in flying height between the inner rail and the outer rail and stably obtain a small flying distance. It provides:

0010

[Means for Solving the Problems] The magnetic disk slider of the present invention has a configuration in which the rail widths of the side rails are asymmetric between the inner and outer rails.

[0011]

[Operation] With the above-described structure, the present invention can lift the rail on the side that is lowered due to the influence of the yaw angle, thereby obtaining a stable flying posture and reducing head crashes. Furthermore, when an electromagnetic transducer is arranged on the outer circumferential side, the magnetic characteristics can be improved.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic disk slider according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the shape of a magnetic disk slider in one embodiment of the present invention. In FIG. 1, 1 is an outer circumference side rail, 2 is an inner circumference side rail, 3 is a cross rail, and 4 and 5 are notches. The rail width x of the outer rail 1 is smaller than the rail width y of the inner rail. The characteristics of the magnetic disk slider configured as described above will be explained below with reference to FIGS. 1, 2 to 5, and 6.

First, FIGS. 2 to 5 show the flying height at the outflow end of the inner rail and the outer rail when the magnetic disk slider of the present invention is used under the same conditions as FIGS. 9 to 12, By making the rail width y of the inner rail 2 larger than the rail width x of the outer rail 1, the buoyancy force of the inner rail is increased, and the floating amount of the inner rail, which is lower in levitation, is increased. As shown in FIG. 6, the difference in flying height between the inner rail and the outer rail almost disappears from the inner circumference to the outer circumference of the magnetic disk.

As described above, according to this embodiment, by widening the width of the inner rail of the side rail relative to the outer rail, the difference in flying height between the inner and outer rails is eliminated and stability is achieved. It is possible to obtain a certain level of levitation.

FIG. 7 shows the shape of a magnetic disk slider in another embodiment of the present invention. 11, 1 in Figure 7
2 is a side rail part, 13 is a cross rail, and 14
and 15 are notches. By making the effective area of the side rail asymmetrical, the same effect as in the above embodiment can be obtained.

[0017]

As described above, the present invention provides a negative pressure magnetic disk slider with asymmetric side rail widths between the inner and outer rails. Stable flying characteristics of the slider can be obtained, the risk of head crash is reduced, and the electromagnetic conversion characteristics are advantageous.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the shape of a magnetic disk slider in an embodiment of the present invention.

FIG. 2 is a diagram showing the relationship between the yaw angle and the flying height at r1 in the embodiment shown in FIG. 1;

FIG. 3 is a diagram showing the relationship between the yaw angle and the flying height at r2 in the embodiment shown in FIG. 1;

4 is a diagram showing the relationship between the yaw angle and the flying height at r3 in the embodiment shown in FIG. 1. FIG.

5 is a diagram showing the relationship between the yaw angle and the flying height at r4 in the embodiment shown in FIG. 1. FIG.

FIG. 6 is a diagram showing the relationship between the flying height of the outflow end of the side rail and the radius in the embodiment shown in FIG. 1;

FIG. 7 is a diagram showing the shape of a magnetic disk slider in another embodiment of the present invention.

FIG. 8 is a shape diagram of a conventional magnetic disk slider.

9 is a diagram showing the relationship between the yaw angle and the flying height at r1 in the embodiment shown in FIG. 8. FIG.

10 is a diagram showing the relationship between the yaw angle and the flying height at r2 in the embodiment shown in FIG. 8. FIG.

11 is a diagram showing the relationship between the yaw angle and the flying height at r3 in the embodiment shown in FIG. 8. FIG.

12 is a diagram showing the relationship between the yaw angle and the flying height at r4 in the embodiment shown in FIG. 8. FIG.

FIG. 13 is a diagram showing the relationship between the flying height of the outflow end of the side rail and the radius in the embodiment shown in FIG. 8;

[Explanation of symbols]

1 Side rail 2 Inner side rail 3
Cross rails 4, 5 Notches 11, 12 Side rails 13 Cross rails 14, 15 Notches 31, 32 Side rails 33 Cross rails 34, 35 Notches

Claims (2)

[Claims] 1. A negative pressure magnetic head slider that generates a levitation force and an adsorption force on a magnetic disk, comprising a side rail formed at both ends of the slider and having a floating surface that generates the levitation force by an air flow. and a cross rail that is formed to straddle both side rails and generates an adsorption force on the downstream side thereof, and the side rails have asymmetric rail widths. . 2. The magnetic disk slider according to claim 1, wherein the side rail has a side rail width on an inner circumferential side of the magnetic disk that is wider than a side rail width on an outer circumferential side.