JPS61148684A - Floating head slider using negative pressure - Google Patents

Abstract

PURPOSE:To reduce effectively the fluctuation of a floating amount due to a change of a Yaw Angle by extending both end sections of a cross rail between both side rails to an air flow-out side along said side rails with a space without connecting with the respective side rails. CONSTITUTION:Both end sections of a cross rail 3 between both side rails 1 for generating a positive pressure are extended at an air flow-out side along both side rails 1 with a space without connecting with the respective side rails. Between two extending end sections 23a and 23b of the cross rail 3, a negative generating section 4 is formed. Namely, Both the side rails 1 for generating the positive pressure and the negative pressure generating section 4 formed between the two extended end sections 23a and 23b by extending both the end sections of the cross rail 3 to the air flow-out side along the respective side rails 1 are respectively separated by groves 21a, 21b.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a negative pressure floating head slider used in a magnetic disk device, etc.
This invention relates to a negative pressure slider structure having a floating characteristic with small angle (change in airflow inflow angle) dependence.

As is well known, the mainstream floating slider used in magnetic disk drives is a positive pressure floating slider that uses only positive pressure.

On the other hand, recently, the floating of the Hent slider is not limited to the above-mentioned positive pressure, but a concave surface is provided in the slider surface to generate negative pressure, and the negative pressure suction force at that time is applied to the floating head. A so-called floating head slider using negative pressure has been proposed, which acts as part of the load to be applied.

A negative pressure floating head slider having such a configuration can be designed to have greater air film rigidity even under a small load than a positive pressure floating slider, and to have good flying characteristics.

However, for a magnetic disk that rotates at high speed, the flying height changes significantly in response to changes in the airflow inlet angle (Yaw angle) during flying, and there is a demand for improvements in these characteristics.

[Conventional technology]

As an example of the above-mentioned conventional floating Radoslider using negative pressure, the Taber flat step type floating Radoslider using negative pressure will be explained as an example. A pair of side rails 1 for generating pressure, and a cross rail 3 are arranged between the pair of side rails 1 so as to be orthogonal to the rails 1, and the pair of side rails 1 and the cross rail are arranged on the air outflow end side. It consists of a structure in which a negative pressure generating part 4 surrounded by 3 is formed.

[Problem that the invention seeks to solve]

By the way, there are two types of positioners in access mechanisms for magnetic disk drives: linear types and rotary types.In recent years, rotary types have become mainstream in small magnetic disk drives because they are advantageous for downsizing. Ta.

However, when applied to a so-called swing arm actuator type small magnetic disk device in which the negative pressure-utilizing floating head slider is driven by a rotary positioner,
When the Hent slider is sought in the radial direction of the magnetic disk rotating at high speed by the swing arm actuator, the direction of lubricating airflow such as air flow relative to the center P direction of the Hent slider, that is, the airflow inflow angle (Yaw^n
gle) θya- changes.

This airflow inflow angle θyaw is about ±10 degrees, which increases the interference between the floating blades and the suction force, and furthermore, in the pair of left and right side rails 1, the floating blades become unbalanced, especially on the airflow outflow side.

For this reason, there were defects in which the number of flying blades decreased and the flying height of the entire slider decreased, and the slider tilted.

As described above, the conventional floating head slider using negative pressure has a drawback that the flying height is highly dependent on the Yaw angle, making it difficult to apply it in combination with a swing arm actuator in a small magnetic disk drive.

Means for Solving Problem C]] The above problem is such that the cross rail between both side rails is not connected to the respective side rails at both ends, but air is flowed along the side rails with a gap between them. This problem is solved by the negative pressure-utilizing floating head slider of the present invention, which has a configuration in which the cross rail is extended toward the outflow side and a negative pressure generating section is formed between the two extended ends of the cross rail.

[Effect]

In other words, the flying height Y of the negative pressure-utilizing floating head slider
The main reason for the large dependence on aw angle is the Yaw Angle (θyaw
) becomes larger, the generation of floating blades is obstructed by the suction force, and the floating blades on the left and right side rails become unbalanced, tilting significantly laterally and reducing the floating amount, the so-called positive pressure generation surface of the side rail. Focusing on the fact that the generation of floating blades is obstructed by the suction force on the air inflow side, we developed a structure in which both side rails for generating positive pressure and the recess for generating negative pressure are separated by a groove etc. The effect of the suction force on the head slider is eliminated by the separated grooves, and it becomes possible to greatly reduce the Yaw Angle dependence of the flying height of the head slider.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic perspective view showing a first embodiment of a floating head slider utilizing negative pressure according to the present invention, and parts equivalent to those in the conventional FIG. 4 are given the same reference numerals.

The floating RAD slider using negative pressure according to the present invention has a cross rail 3 between both side rails 1 for generating positive pressure as shown in the figure.
Both ends of the cross rail 3 are not connected to each side rail 1 and are extended toward the air outflow side along the side rail 1 with a gap, and the two extended ends 23a and 23 of the cross rail 3 are
A configuration in which the negative pressure generating section 4 is formed between b, in other words,
Both side rails 1 for generating positive pressure and a negative pressure generating section 4 formed between two extended ends 23a and 23b extending both ends of the cross rail 3 toward the air outflow side along each side rail 1. and are separated by grooves 21a and 21b, respectively.

Such a slider structure can be formed at the same time as the negative pressure generating section 4 is formed by a chemical etching method, a physical dry etching method, or the like. In this way, by creating a slider structure in which both side rails 1 and the negative pressure generating section 4 formed between both extending ends 23a and 23b of the cross rail 3 are separated, both side rails 1 and the negative pressure are separated. The problem of interference between the floating blade and the suction force generated in the generating section 4 is eliminated, and the YawAngle (θy
The unbalance of the positive pressure on the pair of left and right side rails 1 with respect to the change in an) is also reduced, and characteristics with small changes in flying height can be obtained.

FIG. 2 is a schematic perspective view showing a second embodiment of the negative pressure-utilizing floating slider according to the present invention, and the same parts as in FIG. 1 are given the same reference numerals.

The difference between this embodiment and the first embodiment shown in FIG. 1 is that, as shown in the figure, a pair of side rails 1 for generating positive pressure and a cross rail 3 are formed between both extending ends 23a and 23b. Groove 31a separated from negative pressure generating section 4.

31b is made into a deeper groove shape than the separation grooves 21a and 21b in the first embodiment, so that the influence of the suction force on the floating blade is completely separated, and the separation effect against interference between the floating blade and the suction force is improved. This is because it has increased the

By adopting such a slider structure, compared to the slider structure of the first embodiment, Yaw An
It becomes possible to reduce the GL dependence, and it is also possible to obtain characteristics with small changes in flying height.

FIG. 3 is a diagram showing Yaw angle dependence of the flying height of the negative pressure-utilizing floating head slider according to the second embodiment of the present invention and the conventional negative-pressure utilizing floating head slider.

In the same figure, curve A is the lubricant airflow outflow end portion of the right side rail 1 (as viewed from the drawing) when the slider structure of the present invention undergoes a change in YawAngle (θyaee) as shown in FIG. floating height and Yaw
The relationship with Angle (θyau) is shown.

Curve B is also on the left side (facing the drawing) side rail 1
The flying height and YawAngle (
θya gentleman).

In addition, curve C shows the flying height at the lubricating airflow outflow end of the right side rail 1 (as viewed in the drawing) when the conventional slider structure undergoes a change in Yasw Angle (θyaw) as shown in Fig. 4. Yaw Angle (θ
yaw).

Furthermore, the curve is also determined by the flying height at the lubricating airflow outflow end of the left side rail 1 (as viewed in the drawing) and Yaw An.
The relationship with gle(θyaw) is shown.

The figure shows that the floating head slider using negative pressure according to the second embodiment of the present invention has a smaller Yasy Angle dependence of the flying height and a smaller inclination in the slider rolling direction than the conventional floating head slider using negative pressure. This is clearly shown.

〔Effect of the invention〕

As is clear from the above description, according to the structure of the negative pressure-utilizing floating RAD slider according to the present invention, YawAngle
Fluctuations in the flying height due to changes in the flying height are effectively reduced, and it is possible to obtain flying characteristics with a small inclination in the rolling direction.

Therefore, with the slider structure of the present invention, it is possible to obtain a negative pressure-utilizing floating head slider that is small, lightweight, and has good flying characteristics and flying stability that can be applied to a rotary swing arm actuator type magnetic disk device.

[Brief explanation of drawings]

1 is a schematic perspective view showing a first embodiment of a floating head slider utilizing negative pressure according to the present invention; FIG. 2 is a schematic perspective view showing a second embodiment of a floating head slider utilizing negative pressure according to the present invention; FIG. 3 is a diagram showing the YawAngle dependence of the flying height of the negative pressure-utilizing floating head slider according to the second embodiment of the present invention and the conventional negative-pressure-utilizing floating head slider. FIG. 3 is a schematic perspective view for explaining a head slider. In the figure, 1 is a pair of side rails, 2 is an inclined surface, 3 is a cross rail, and 4 is a negative pressure generating portion, 21a. 21b is a separation groove, 23a and 23b are both ends of the cross rail 3, and 31a and 31b are deep separation grooves.

Claims (1)

[Claims] In a head slider configuration that has a pair of side rails for generating positive pressure on both sides of the air bearing surface and a cross rail that prevents air inflow between the two side rails, both ends of the cross rail are connected to the The cross rail is characterized in that it is not connected to each side rail but extends toward the air outflow side along the side rail with a gap, and a negative pressure generating section is formed between the two extended ends of the cross rail. Floating head slider that uses negative pressure.