JPS63187478A - Head slider - Google Patents

Abstract

PURPOSE:To obtain a head slider having less dust sticking by providing a slot not reaching a flowing end along a lengthwise direction to an air bearing and providing a throughhole reaching a face except the air bearing face of the slider to an groove so as to attain excellent bearing dynamic characteristic and stable floating. CONSTITUTION:Two air bearing rails 5 as a floating means by the air bearing of a slider member 1 consist of a bearing tilting face 4 and a bearing plane part 3 formed to the gas intake side 5a. The both are separated into two while the flowout end 5b of the rails 5 is left by the groove 7 and the throughhole 8 reaching the rear part 1a of the air bearing rails 5 of the slider member 1 from the flowout end 7b of the slot 7 is provided. Nearly the same atmospheric pressure is provided to the groove 7 and the throughhole 8 and the pressure at the bearing plane up to the flowout end 7b after the groove 7 is small and the gas bearing rail 5 acts as the assembling of the two gas bearing rails. Thus, the bearing dynamic characteristic is excellent and stable floating is attained, then the head slider having less dust sticking is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a head slider that reproduces information by floating a head above a recording medium such as a magnetic disk, and particularly relates to a head slider that reproduces information by floating a head above a recording medium such as a magnetic disk. , relates to a magnetic head slider suitable for stable flying.

[Conventional technology]

In a magnetic head slider, a slider with a magnetic head attached is placed on a magnetic recording medium such as a magnetic disk, and by rotating this magnetic recording medium, the magnetic head is moved by an air flow generated along the rotating medium. The slider is levitated and the magnetic head records information on the magnetic recording medium or reproduces information recorded on the magnetic recording medium. The conventional structure of a magnetic head slider is, for example, disclosed in Japanese Patent Application Laid-Open No. 49-1
It is described in Japanese Patent No. 21514, and is shown in FIGS.

As shown in FIG. 12, a tapered flat slider is used as the floating means. Slider 1 is.

The slider has a double-barrel shape, and gas bearing rails 5 each consisting of a flat bearing section 3 and an inclined bearing surface 4 are formed at both ends of the slider along the direction of air flow.

The magnetic head 6 is provided at the outflow end of a center rail 10, which is another rail provided at the center of the slider.

Due to the rotation of the disc-shaped magnetic recording medium 20, the slider 1 is
is floated with a minute gap relative to the recording medium.

In addition, as another known example, when a bud magnetic head is used, for example, Electronic Design No. 5, March 1, 1980, pages 60-63 (ELECTRONIC DESIGN 5, Arch 1, 1980 #p60-6)
As shown in FIGS. 13 and 14, a thin film magnetic head 8 is provided on the outflow end surface of the gas bearing rail 5 of the twin-barrel slider 1.

[Problem that the invention seeks to solve]

The first problem with the above conventional technology is that the stiffness of the gas bearing film of the slider and the shaft passive characteristics such as damping are insufficient, and the high frequency damping characteristics are not particularly taken into account. The resonance magnification at the bearing film resonance point increased, the slider's tracking characteristics deteriorated, and the resonance magnification at the air film resonance point increased significantly.

A second problem with the prior art is that the flying characteristics of the slider deteriorate due to the adhesion of dust that has entered the gas bearing rail, resulting in accidents in which the slider comes into contact with the recording medium. These points were not considered.

Furthermore, the third problem with conventional methods is that when lowering the flying height of a slider in which a thin film magnetic head is mounted on the outflow end of a gas bearing rail, it is difficult to reduce the rail width, making it difficult to use conventional pressing force and increasing the load. This reduces the reliability of the device when the slider and disk are connected or slid together.

An object of the present invention is to provide a head slider with excellent shaft passive characteristics, stable flying, and less dust adhesion.

[Means for solving problems]

The above purpose is to provide one or more grooves that do not reach the outflow end of the levitation means using a gas bearing along the longitudinal direction of the levitation means, and provide in these grooves a through hole that reaches a surface other than the gas bearing surface of the slider. This is achieved by

[Effect]

Due to the longitudinal grooves provided in the gas-bearing levitation means, the levitation means essentially operates as two separate levitation means. As a result, the flow due to the viscosity of the air accompanying the rotation of the recording medium is compressed in the longitudinal direction of the floating means, and at the same time generates more side flows. Increase. Further, by providing this groove with a through hole that reaches the other surface of the gas bearing surface of the slider member, the gas in the groove is actively discharged to the outside through the through hole, further improving the shaft passive characteristics. Due to this through hole, the pressure in the groove becomes almost atmospheric, and the pressure generated in the flat area from the rear end of the groove to the outflow end of the flotation means is suppressed to a small level.

Further, due to the gas flow through the one through hole, dust that has entered the floating means can be discharged to the outside of the slider, and deterioration of flying characteristics due to dust adhesion can be suppressed to a small level.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The gas bearing rail 5, which serves as a floating means using two gas bearings of the slider member 1, consists of a bearing inclined surface 4 and a bearing flat portion 3 formed on the gas inflow side 5a, both of which are connected by grooves 7 to allow the rail 5 to flow out. It is separated into two parts except for the end side 5b, and further reaches the back side 1a of the gas bearing rail 5 of the slider member 1 from the outflow end side 7b of the groove 7.

It has a configuration in which a through hole 8 is provided.

The flow flowing into the gas bearing rail 5 due to the viscosity of the gas is
Ultimately, there are three flows: a flow that reaches the rail outflow end 5b, a side flow, and a flow that flows through the groove 7 and the through hole 8. The pressure in the groove 7 and the through hole 8 is almost the same as that of the atmosphere, and the pressure in the groove 7
The pressure generated in the bearing flat portion up to the rear outflow end 7b is small, and the gas bearing rail 5 essentially functions as a collection of two gas bearing rails.

FIG. 15 shows the relationship between the slider rail width ρR and the pressing load W when the rotation speed U of the recording medium is constant and the flying height ih of the slider is constant. The pressing load W has a relationship of approximately W cc Q Ra with respect to the rail width QR, and increases when the flying height is small. In the figure, the solid line indicates the flying height, hl, and the broken line indicates the flying height, h2, where hx>h2. In this embodiment, the outflow end rail width is QR, but in reality the rail width is Ωa and the rail width is Qb.
Since it works as two rails of the rail, the pressing load is small, and even if the outflow end rail end Qn is increased, it is possible to lower the floating level without increasing the pressing load W.

FIG. 16 shows the relationship between the damping coefficient of the gas bearing membrane (C1l is shown as a representative) and the rail width QR for a unit pressing load. By reducing the rail width aR, the damping coefficient increases, especially in the high frequency range. This tendency also applies to other bearing characteristic components of the gas bearing membrane.

Therefore, according to this embodiment, although the total rail width is large, the pressing load can be reduced. Of the three flows further ahead,
The flow generated by the grooves 7 and the through holes 8 improves the shaft passive characteristics, improves the slider tracking characteristics, and allows stable floating.

Further, this flow actively discharges dust that has entered the gas bearing rail 5, and has the effect of reducing dust adhesion to the gas bearing rail 5.

Furthermore, since the rail width on the outflow end side 5b of the gas bearing rail 5 can be made relatively wide for a low-flying slider, a thin film magnetic head can be easily provided on this end surface.

Other embodiments of the present invention are shown in FIGS. 3 and 4.

This is an example in which the groove 7 is provided only within the flat surface of the bearing, and the same effect can be obtained.

Other embodiments of the present invention are shown in FIGS. 5 and 6.

Each rail width Qa of the bearing flat portion separated by the groove 7.

This is an example in which Qb is Qa#Qb, Qa'≠Qb'.

Other embodiments of the present invention are shown in FIGS. 7 and 8.

This is an example in which one through hole 8 is provided in the groove 7, one each on the inflow side and the outflow side of the slider.

Other embodiments of the present invention are shown in FIGS. 9 and 10. This is an example in which through-holes 8 are provided on the inflow side 7a and the outflow side 7b of the groove 7 provided in the flat surface of the bearing.

By forming an ellipse as described above, the first effect is,
By reducing the actual rail width, the bearing characteristics when the slider is floating can be improved, especially the characteristics in the high frequency region, and the slider can be stably floated.

The second effect is that the through holes provided in the grooves make it possible to discharge dust that has entered the gas bearing rail, reducing the amount of dust attached and improving reliability.

As a third effect, since the groove does not reach the outflow end of the gas bearing rail, it is possible to mount a thin film head on the outflow end surface of the gas bearing rail, making it possible to narrow the rail width of the gas bearing rail at the outflow end. A low flying height can be achieved without increasing the pressing load.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to obtain a head slider that has a stable shaft-passive characteristic, floats stably, and has little dust adhesion.

[Brief explanation of the drawing]

FIG. 1 is a plan view of one embodiment of the present invention, FIG. 2 is a sectional view taken along line nn' in FIG. 1, FIG. 3 is a plan view of another embodiment of the present invention, and FIG. 3 is a side view, FIG. 5 is a plan view of still another embodiment of the present invention, FIG. 6 is a sectional view taken along the line VI-Vl' of FIG. 5, and FIG. 7 is a still another embodiment of the present invention. Plan view, No. 8
The figures are a sectional view taken along the line ■-■' of FIG. 7, FIG. 9 is a plan view of still another embodiment of the present invention, FIG. 10 is a side view of FIG.
Figure 1 is a perspective view of a conventional slider, Figure 12 is a side view of Figure 11, Figure 13 is a plan view of another conventional slider, Figure 14 is a side view of Figure 13, and Figure 15 is a side view of Figure 11. FIG. 16 is an explanatory diagram showing the relationship between slider rail width and pressing load. FIG. 16 is an explanatory diagram showing the relationship between slider rail width and bearing damping coefficient. 1...Slider, 2...Slot, 3...Bearing flat part. 4... Bearing inclined surface, 5... Gas bearing rail, 6...
・Magnetic head, 7... Groove, 8... Through hole, 9...
Thin film magnetic head Figure 1 V Figure Z Figure 3 Figure 74 Figure 5 Figure 106 Figure 7riU 'gg Figure Z q Figure/b Feather lρ Figure 111 Figure 772 Figure % 13th Figure 14 Figure 3 Tsuyama bet+ar9p 6 Shooting pods 4 bales of hedup straw 15 diagram - Lua Masa Jg (kawa m9

Claims (1)

[Claims] 1. In a head slider having a head and a floating means using a gas bearing for holding the head facing a rotating recording medium, the floating means has the following features: 1. A head slider characterized in that at least one groove is provided along the slider member that does not reach the outflow end, and the groove portion is provided with one or more through holes that reach a surface other than the surface of the floating means of the slider member. 2. The head slider according to claim 1, wherein the through hole is formed through the back surface of the floating means surface of the slider member. 3. The head slider according to claim 1 or 2, wherein the through hole is provided on the outflow end side of the longitudinal groove of the floating means.