JPH06124562A - Floating head slider and rotary disk memory device - Google Patents

Abstract

PURPOSE:To adjust the floating posture of the slider by providing contracted parts where the rail width once narrows from the front to the rear end on an inflow side from the center in the longitudinal direction on a pair of positive pressure floating surfaces of both sides of the slider. CONSTITUTION:The shape of side rails 17 for improving a yaw angle characteristic and the negative pressure acting on a negative pocket part 19 lessen the influence of the bearing effect of the inflow side on the rear flow of the contracted parts 21. A bearing surface 24 of the rear part has the characteristic of a nearly independent plane bearing. The constricted parts 21 are provided on the inside side of the center in the longitudinal direction of the slider 12, by which the adjustment of the floating posture of the slider 12 by adjusting the increase of the area of the bearing surface 14 of the rear part or its position is enable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating head slider and a rotating disk storage device, such as a magnetic disk device, which floats over a surface of a traveling storage medium with a minute floating gap.
In particular, the floating surface shape has been improved, and the flying height at any radial position has been made almost constant regardless of the access mechanism such as linear or rotary, and the flying head slider with improved flying characteristics of the slider and the rotating disk equipped with the slider. Regarding a storage device.

[0002]

2. Description of the Related Art A conventional technique will be described by taking a magnetic disk device as an example. As a conventional floating head slider for a magnetic disk device utilizing positive pressure, there is, for example, a taper flat slider described in Japanese Patent Laid-Open No. 2-101688. This slider is composed of a center rail composed of an inclined surface and a plane portion and two side rails. The center rail has a narrow inflow side width and a wide outflow end width, and a transducer is mounted on the end face of the outflow end. The side rails do not exceed the width at the front end and do not reach the outflow end, and each rail has a structure in which it is isolated via a bleed portion having a substantially constant width.

A similar example is disclosed in Japanese Patent Laid-Open No. 4-17176. In this known example, three air bearing surfaces are separated into front and rear, tapered flat rails are arranged at both ends on the inflow side, and a flat plate rail is provided only at the central outflow end.

A conventional floating head slider using negative pressure is disclosed in Japanese Patent Laid-Open No. 60-101781. The slider in this known example is provided with a negative pressure pocket for generating negative pressure on the cross rail outflow side, and the rail width of the central portion in the longitudinal direction of the side rails provided on both sides of the slider is narrower than the inflow side and the outflow side. Is.

As a similar example, US Pat. No. 5,062,017
There is one described in the publication. In this known example, the constriction positions of the side rails on both sides of the negative pressure recess are set to about 1/3 from the inflow end, and the constriction width is set to about 1/2 of the rail width.
Constriction and cross rail depth shallower than negative pressure recess 2nd
It is a structure composed of steps.

Another similar example is US Pat. No. 480.
There is one described in Japanese Patent No. 2042. This known example has a structure in which a head portion and a cross bar are provided over the entire width at the outflow end of the slider. The negative pressure recess does not reach the outflow end and has a lateral groove in front of the head portion or the crossbar.

Another similar example is disclosed in Japanese Patent Laid-Open No.
There is one described in Japanese Patent Application Laid-Open No. 0-211671. This known example has a structure in which a positive pressure side rail provided on both sides of the slider and a negative pressure recess are separated by a groove, and the negative pressure recess is formed by a buffer pad.

Conventionally, as an access mechanism for mounting these sliders, there are a linear system for linearly moving and positioning in the radial direction of the disk and a rotary system for oscillating around a rotation shaft to position at a predetermined radial position.

[0009]

The magnetic disk drive is
There is a trend toward smaller size and larger capacity. As one of the means for realizing this, there is a method of increasing the areal density of recording. Area density consists of linear density and track density.
The flying height of the slider needs to be narrowed, and it is possible to prevent various disturbances such as vibration at the time of seek, which is a movement operation from a track on the disk to another track, and vibration due to the waviness of the disk.
It is necessary to keep the change in the flying height small.

Furthermore, when a magnetoresistive element (hereinafter referred to as an MR head) suitable for high-density recording is used in the reproducing head, or when the inner and outer linear recording densities which have begun to be adopted in a small disk device are kept constant. In the constant density recording, the technique of making the flying height constant at any position on the disk is important. Practically, the flying height at other positions is required to be in the range of 100% to 120% with respect to the flying height at the inner circumference.

To this end, among the basic flying characteristics of the slider, there is no or small change in the flying height due to the speed difference between the inner circumference and the outer circumference of the disk (hereinafter referred to as the flying speed characteristics), or when the disk rotates. There is no or a small characteristic that the slider flying height is not lowered (hereinafter referred to as yaw angle characteristic) when an angle (hereinafter, referred to as yaw angle) formed by the slider tangential direction with respect to the disk tangential direction is provided. .

However, in the conventional technique using only the positive pressure described above, for example, in the taper flat slider described in Japanese Patent Laid-Open No. 2-101688, the positive pressure generally increases with the velocity, and therefore the flying velocity characteristic is increased. When the inner and outer velocities double, the flying height increases from about 1.5 to 1.6 times, and it is impossible for the linear access mechanism to keep the flying height constant on the inner and outer circumferences of the disk. Is. In addition, the yaw angle characteristic is poor, and the slider flying height when the yaw angle is attached is greatly reduced.

In the conventional rotary system, a method has been adopted in which an increase in the flying height due to the floating speed characteristic on the outer peripheral side is offset by a decrease in the flying height due to the yaw angle characteristic to make the flying height constant. From the point of view of the above, during the seek operation, the gas flowing into the slider is added with a yaw angle corresponding to the seek speed with respect to the disk speed (hereinafter referred to as a seek yaw angle), which causes a large decrease in the flying height. In the future, the frequency of contact with the disk will increase rapidly in low flying height systems,
In the worst case, no consideration was given to the problem of contact damage. That is, the fact that the flying height can be kept constant and fluctuations in the flying height can be kept small has not been taken into consideration. The same applies to Japanese Patent Laid-Open No. 4-17176.

On the other hand, there is a method of utilizing a negative pressure as a means for improving the floating velocity characteristic. As a floating head slider using negative pressure with a head mounted on the rear end of a conventional side rail,
For example, there is one described in JP-A-60-101781. In this publicly known example, the improvement of the yaw angle characteristic, which was a problem with the side rail having a constant flat width, is realized by a shape in which the central width of the positive pressure rail is narrow and the front and rear widths are sufficiently wide.

However, for this reason, the substantial rail-center distance of the side rails is reduced, and the air film rigidity (referred to as roll rigidity) around the rotation axis in the slider longitudinal direction is proportional to the square of the substantial rail-center distance. And then decrease. Further, by making the outflow side from the constricted position a flat plate bearing, the air film reaction force itself is lowered, and the roll rigidity is lowered. The decrease in roll rigidity increases the decrease in flying height in the roll direction due to the difference between the center of gravity of the slider and the center of rotation due to the seek acceleration during seek (hereinafter referred to as acceleration depression), and in the worst case,
No consideration was given to the problem of damage caused by contact with the disk. With this type of negative pressure slider, there is a trade-off between yaw angle characteristics and roll rigidity, making it difficult to achieve both. Further, the decrease in roll rigidity causes a large change or decrease in the flying height with respect to the error in the slider width direction that occurs during slider processing and assembly, which is a problem from the viewpoint of production.

Another problem of the slider utilizing negative pressure is to make the depth of the negative pressure groove shallow and to have a negative pressure adjusting means. Since the negative pressure groove cannot be machined geometrically, it is necessary to perform it by a processing method such as ion milling, but since the processing rate is as slow as about 1 μm / hour (in the case of general ion milling), processing time is required. Therefore, in order to shorten the processing time, the depth of the negative pressure groove is one step, and it is desirable that the depth is about 10 μm at the deepest. However, in the above-mentioned known example, since the cross rail is provided over the entire width on the inflow side of the negative pressure portion, it is necessary to make the negative pressure groove depth as deep as about 20 μm in order to obtain the required floating velocity characteristics. Yes, there was a problem in that the processing time increased and the processing accuracy deteriorated. Excessive negative pressure not only does not satisfy the levitation speed characteristics, but also deteriorates the levitation characteristics of the positive pressure rail (for example, adhesion of dust to the taper part, etc.), which accelerates the decrease in the levitation amount and, in the worst case, damage due to contact with the disk. Was not taken into consideration.

Further, at the time of contact start / stop, the cross rail causes roughness of the disk surface, cutting of protrusions and dust generation, and there is no discharge part for dust entering the cross rail part during floating, and the cross rail enters the cross rail. No consideration was given to the problem of damage to the disk surface due to contact growth through dust on the side edges and contact with the cross rail.

US Pat. No. 5,062,2017 is substantially the same. However, the constricted portions of the side rails, the cross rail portion, and the negative pressure portion have different depths. 2 for this
It is necessary to process two times using different types of masks, and variations in levitation characteristics due to mask alignment and depth processing errors,
Moreover, no consideration was given to the problem that the processing cost increases due to the manufacturing time. The depth of the cross rail is 1-2 μm and the problem of dust is similar.

Other known negative pressure sliders, such as US Pat. No. 4,802,042 and Japanese Patent Laid-Open No. 60-211671, do not consider the yaw angle characteristic.
There is a problem in the variation of the flying height. In the case of the rotary method, the flying height cannot be kept constant, which is a problem.

An object of the present invention is that the flying speed characteristic of the slider and the yaw angle characteristic are excellent, the flying height at any position on the disk is made almost constant regardless of the method of the access mechanism, and the fluctuation of the flying height is small. It is an object of the present invention to provide a floating head slider that is suitable for a low flying height that allows stable lifting of a presser foot, and a rotating disk storage device equipped with this slider.

Another object of the present invention is to provide a floating head slider suitable for a low flying height by avoiding dust from adhering to the gas bearing surface on the slider inflow side, which has good floating characteristics and excellent sliding resistance. The object of the present invention is to provide a rotating disk storage device equipped with this slider.

Still another object of the present invention is to provide a floating head slider which is easy to form a groove by negative pressure adjusting means and is excellent in workability.

[0023]

In order to achieve the above object, the present invention provides a pair of positive pressure generating surfaces on both sides of a gas bearing surface of a slider which is arranged to face a rotating storage medium, and the positive pressure generating surface. A cross rail that connects the positive pressure generation surfaces in the same plane on the inflow side of the generation surface, and a reverse step-shaped recess surrounded by the positive pressure generation surface and the cross rail behind the cross rail. In the floating head slider utilizing negative pressure, the pair of positive pressure air bearing surfaces has a constricted portion in which the rail width once narrows from the front to the rear end, the rail width widens toward the rear end, and both sides are formed. It has a structure that does not reach the rear end, and has a central positive pressure floating surface that is substantially the same as the pair of positive pressure floating surfaces at the center of the outflow portion of the gas bearing surface of the slider, and the central positive pressure floating surface is isolated only at the outflow portion. Not reach the inflow side It has means is achieved by mounting the transducer on the rear end of the central positive pressure generating surfaces.

Further, the gas bearing surfaces of the slider arranged so as to face the rotating storage medium have a pair of positive pressure generating surfaces on both sides, and the positive pressure generating surfaces are flush with each other on the inflow side of the positive pressure generating surfaces. A negative pressure utilizing type floating head slider having a cross rail connected to the inside of the cross rail, and having the positive pressure generating surface and a recess of a reverse step surrounded by the cross rail at the rear of the cross rail. The pressure-bearing surface has a constricted portion where the rail width once narrows from the front to the rear end,
The rail has a structure in which the rail width is widened toward the rear end and does not reach the rear ends of both sides, and the central positive pressure air bearing surface divides the recess into two parts in the widthwise central part of the slider. It is also achieved by having a central positive pressure air bearing surface extending to the center of the portion, and the central positive pressure air bearing surface having a structure in which the air bearing surface width widens from the center in the slider length direction to the outflow side.

Further, the gas bearing surfaces of the slider arranged to face the rotating storage medium are on the same plane between the pair of positive pressure generating surfaces and the positive pressure generating surfaces on the inflow side of the positive pressure generating surfaces. A negative pressure utilizing type floating head slider having a cross rail connected to the inside of the cross rail, and having the positive pressure generating surface and a recess of a reverse step surrounded by the cross rail at the rear of the cross rail. The pressure-bearing surface has a constriction where the width of the air bearing surface narrows from the front to the rear end, the width of the air bearing surface widens toward the rear end, and does not reach the rear ends of both sides. The central positive pressure air bearing surface extends from the cross rail that divides the reverse step-shaped recess into two parts to the center of the outflow portion of the gas bearing surface, and the central positive pressure air bearing surface is on the outflow side from the center in the slider length direction. Air bearing surface width Has a spread structure, said provided grooves in one or more recesses of the same depth leading to the front end from the recess to the cross rail also achieved by mounting the transducer on the rear end of the central positive pressure generating surfaces.

Further, the pair of positive pressure air bearing surfaces has a constricted portion whose outside is substantially straight and whose side contacting with the recess is such that the width of the air bearing surface is narrowed from the front to the rear end. It is also achieved by having a structure in which the width is wide and does not reach the rear ends of both sides.

The pair of positive pressure air bearing surfaces has a constricted portion where the air bearing surface width is once narrowed from the front to the rear end, the air bearing surface width is widened toward the rear end, and the rear end is from the slider side. It has a line segment that goes to the center of the outflow end at an obtuse angle,
It is also achieved by having a structure that does not reach the rear ends of both sides.

Also, the groove provided on the cross rail has a groove width of ½ or less of the maximum width of the recess in the subsequent flow, and the groove width is the positive pressure generation on the outflow side of the recess. It is also achieved by making the width narrower than the minimum width between the surface and the central positive pressure generating surface.

The gas bearing surfaces of the slider, which are arranged to face the rotating storage medium, have a pair of positive pressure generating surfaces on both sides, and on the inflow side of the positive pressure generating surfaces, the positive pressure generating surfaces are in the same plane. A pair of positive pressure air bearing surfaces, wherein a pair of positive pressure air bearing surfaces are provided, the negative pressure utilizing floating head slider having a connecting cross rail, and having the positive pressure generating surface and a reverse step-shaped recess surrounded by the cross rail at the rear of the cross rail. Has a constriction in which the air bearing surface width narrows from the front to the rear end, the air bearing surface width widens toward the rear end, and the rear end has a line segment from the slider side toward the center of the outflow end at an obtuse angle. , A structure that does not reach the rear ends of both sides, and has a central positive pressure floating surface that extends from the cross rail that divides the recess into two into the center of the outflow portion of the gas bearing surface in the widthwise central portion of the slider. The upper surface is The cross-section has a structure in which the width of the air bearing surface widens from the center in the longitudinal direction to the outflow side, and a groove having the same depth as the recess communicating from the recess to the front end is provided along the central positive pressure air bearing surface of the cross rail, and outside the groove. It is also achieved by providing a peninsula part extending from the cross rail to the outflow side and mounting a transducer at the rear end of the central positive pressure generating surface.

The gas bearing surfaces of the slider, which are arranged so as to face the rotating storage medium, have a pair of positive pressure generating surfaces on both sides, and on the inflow side of the positive pressure generating surfaces, the positive pressure generating surfaces are in the same plane. A pair of positive pressure air bearing surfaces, wherein a pair of positive pressure air bearing surfaces are provided, the negative pressure utilizing floating head slider having a connecting cross rail, and having the positive pressure generating surface and a reverse step-shaped recess surrounded by the cross rail at the rear of the cross rail. Has a constriction where the air bearing surface width narrows from the front to the rear end, the air bearing surface width expands toward the rear end, and does not reach the rear ends of both sides. The concave portion is divided into two and extends to the center of the outflow portion of the gas bearing surface, and has a central positive pressure air bearing surface of a structure in which the width of the air bearing surface widens on the outflow side, and the area of the central positive pressure air bearing surface on the outflow side from the load point of the slider. Is positive pressure on both sides Also achieved by a smaller than the sum of the areas.

The slider mounted with the transducer, which is arranged so as to face the rotating storage medium, and the positive pressure generated by the gas flow formed on the surface of the slider facing the storage medium and accompanying the rotation of the storage medium In a floating head slider having a gas bearing surface for flying a slider, the slider has a front end and a rear end, and a pair of positive pressure generating surfaces are arranged on both sides of the gas bearing surface, and the positive pressure generating surface is a slider. The positive pressure generating surface does not reach the rear end, and the positive pressure generating surface rear end has a line segment from the slider side toward the slider outflow end center at an obtuse angle, and the central positive pressure generating surface is arranged at the central rear end of the gas bearing surface. This can also be achieved by mounting a transducer on the rear end of the central positive pressure generating surface.

The constricted portion position of the gas bearing rail can also be achieved by providing it on the front end side with respect to the center in the slider longitudinal direction.

The distance between both side ends of the rear end of the gas bearing rail from the slider rear end is longer than the distance from the slider rear end on the slider center side of the rear end of the gas bearing rail. .

Further, this can be achieved by mounting the above floating head slider on a rotating disk storage device.

[0035]

According to the present invention, the pair of positive pressure air bearing surfaces on both sides of the slider are provided with a constricted portion on the inflow side from the center in the longitudinal direction to narrow the rail width from the front to the rear end. Due to the structure that widens and does not reach the rear end of both sides, the rear part of the constricted part is not affected by the front part and has almost flat plate bearing characteristics, and the levitation force generated by the increase in speed is smaller than the conventional taper flat type Become. On the other hand, the inflow side includes a cross rail and a large amount of positive pressure is generated. With this configuration, the flying posture angle of the slider is increased due to the increase in speed. Then, the gap on the air bearing surface that has not reached the outflow end increases, and the levitation force generated behind the constricted portion decreases accordingly. As a result, even if the negative pressure acting on the reverse step-shaped concave portion behind the cross rail is small, the levitation amount at the rear end of the center positive pressure air bearing surface quickly flies at a low speed at which negative pressure is small,
After that, the increase in negative pressure due to the increase in speed and the levitation force of positive pressure work in a balanced manner to suppress the change in the levitation amount.

Further, the pair of positive pressure air bearing surfaces on both sides of the slider is provided with a constricted portion on the inflow side from the center in the longitudinal direction to narrow the rail width from the front to the rear end, and the rail width is widened toward the rear end. As a result, there is an effect of suppressing a small change in the effective area of the positive pressure air bearing surface when there is no yaw angle and the effective area of the positive pressure air bearing surface when there is a yaw angle. Normally, when the yaw angle is attached, the flying height of the air bearing surface on the inflow side decreases, but the spread of the rail width toward the slider center side increases the flying force of the air bearing surface and suppresses the slider widthwise inclination. It has an effect. In particular, by configuring the rear end of the positive pressure air bearing surface to have a line segment from the side to the center of the outflow end without reaching the rear end of both sides, it is better to have a yaw angle than without a yaw angle. The rail length behind the constricted portion can be lengthened, which acts to suppress the reduction in the flying height due to the yaw angle.

Further, the structure in which the pair of positive pressure air bearing surfaces does not reach the slider outflow end, and the width of the center positive pressure floating surface is set to a width in which the transducer can be mounted, the minimum flying height position during slider flying is flown out of the center positive pressure floating surface. Since the roll rigidity by the pair of positive pressure air bearing surfaces is responsible for the force against the fluctuation of the flying height in the roll direction, the ratio of the central positive pressure air bearing surface outflow end width to the slider width hardly acts. In particular, even if the position of the rear side of the positive pressure air bearing surface on both sides is determined by the posture of the slider, the seek direction acceleration during seek, the slider roll rigidity, and the slider roll direction, the center positive pressure air bearing surface outflow end By selecting it so that it does not fall below the flying height, and by configuring it to have a line segment from the side toward the center positive pressure air bearing surface outflow end, the possibility of the minimum flying height can be determined as the center positive pressure air bearing surface outflow end,
It also makes it possible to increase roll rigidity.

Further, the groove extending from the negative pressure generating concave portion provided on the cross rail to the front end has a bypass function of the inflow of the fluid into the concave portion having the reverse step shape, and regulates the expansion of the fluid in the concave portion. As a result, the negative pressure generated can be reduced and adjusted. Further, by reducing and adjusting the negative pressure in the groove, the depth of the recess can be made shallow, and by making the groove depth the same as that of the recess, it is possible to shorten the processing time with one processing. Further, since the groove portion is a negative pressure area with respect to the positive pressure area of the cross rail, among the dust that enters from the inflow side, the dust that advances from the center has a function of avoiding the cross rail portion and discharging through the groove. .

Also, the peninsula portion on the outflow side provided on the cross rail adjacent to the groove prevents the fluid from entering from the groove and stabilizes the generation of negative pressure in the recess surrounded by the peninsula portion and the cross rail. There is. If the negative pressure generated is made constant by attaching the peninsula part, the groove width can be widened.

Making the area of the central positive pressure air bearing surface smaller than the areas of the positive pressure air bearing surfaces on both sides behind the load point causes the main levitation force to be applied to the positive pressure air bearing surfaces on both sides, and is generated on the central positive pressure air bearing surface. Since the positive pressure is suppressed, it has the effect of realizing the above-mentioned floating velocity characteristics at a lower negative pressure. Positive pressure on the center positive pressure air bearing surface acts to secure pitch rigidity and disc followability.

[0041]

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

FIG. 1 is a perspective view showing a first embodiment of the slider of the present invention. In FIG. 1, the gas bearing surface 13 of the slider 12 arranged to face the rotating storage medium.
Has a pair of positive pressure generating surfaces (hereinafter referred to as side rails) 17 on both sides. The side rail 17 is composed of an inflow-side inclined surface 14 and a flat surface portion 15, and has a constricted portion 21 in which the rail width once narrows from the inflow end to the outflow end.
The constricted portion 21 is provided on the inflow side with respect to the longitudinal center of the slider 12. In this embodiment, the width of both sides of the rail is changed. The angle is about the same as the sum of the yaw angle when mounted on the magnetic disk device and the seek yaw angle at the innermost circumference, and the inner angle is increased. The rear bearing surface 24, which is widened in the width direction on the outflow side of the constricted portion 21, ends at the rear end 22 of the side rail and does not reach the outflow end of the slider.

A cross rail 18 is provided on the inflow side between the side rails 17, and the cross rail 18 and the side rail 17 are provided.
An inverse step-shaped recess (hereinafter referred to as a negative pressure pocket portion) 19 surrounded by is formed. The inclined surface 14 is also formed on the inflow side of the cross rail 18. A central positive pressure generating surface (hereinafter referred to as a center rail) 20 that divides the negative pressure pocket portion 19 into two and extends from the inflow end to the outflow end is provided at the center of the slider width direction. Negative pressure pocket 1 along the center rail 20
The cross rail 18 is provided with a groove 16 having the same depth as the negative pressure pocket portion 19 extending from 9 to the inflow end.

The width of the center rail 20 is narrow on the inflow side (for example, about 100 μm) and substantially parallel to each other, so that the center rail 20 extends from the center of the slider in a triangular shape from the widened portion 26 on the outflow end side to reach the outflow end. The transducer 11 is mounted on the rear end of the outflow end of the center rail 20. The negative pressure pocket 19 and the groove 16 are processed by ion milling or the like to have a shallow depth of about 10 μm or less. In addition, the inclined surface 14 is an example after the depth processing.

Next, the operation of the above-described first embodiment of the present invention will be described with reference to FIGS.

FIG. 2 is a perspective view of the pressure distribution of the first embodiment of the present invention. FIG. 3 is a side view of the pressure distribution of the first embodiment of the present invention. The airflow accompanying the rotation of the recording medium is compressed by the inclined surface 14 provided on the inflow side of the slider and the pressure rises, the airflows on both sides proceed on the side rails 17, and the airflow except the central portion in the slider width direction crosses. It expands in the negative pressure pocket portion 19 which spreads in the reverse step shape via the rail 18 and becomes a pressure lower than the atmospheric pressure, that is, a negative pressure, and advances to the outflow end. The air flow that has flowed in from the inflow side groove 16 proceeds directly to the negative pressure pocket portion 19 without increasing the pressure, and works to reduce the negative pressure generated in the negative pressure pocket portion 19. The center rail 20 has a negative pressure on the inflow side where the rail width is narrow due to the negative pressure of the negative pressure pocket portions 19 on both sides, and generates a positive pressure only on the outflow side having the widened portion 26. The air flow traveling through the side rail 17 causes a sharp pressure drop due to the side flow due to the reduction of the rail width due to the constricted portion 17 and the inflow into the negative pressure pocket, after which the pressure rises again at the rear bearing surface 24, and after the side rail. At the end 22, a weak negative pressure is once returned to the atmospheric pressure.

According to this embodiment, the pair of side rails 17 on both sides of the slider are tapered from the inflow end corresponding to the device yaw angle to the constricted portion 21 and from the narrowed portion and the constricted portion 21 to the side rail rear end 22. Due to the configuration of the expanded rear bearing surface 24, the change in the area of the side rail 17 surrounded by the parallel line passing through the constricted portion 21 due to the presence or absence of the yaw angle is reduced, and the yaw angle characteristic is improved. Further, the angle of the rail width change inside the slider is increased to increase the generation of positive pressure on the rear bearing surface 22 of the side rail 17 on the side where the gas flows in due to the yaw angle. This prevents the slider from tilting due to the movement of the center of pressure in the width direction and the generation of a moment about the central axis in the slider longitudinal direction.

FIG. 8 is an explanatory view for explaining the yaw angle characteristic of the slider of the present invention. The slider of the present invention can suppress the lowering of the flying height less than the conventional taper flat type and the conventional negative pressure type.

Side rail 1 for improving the yaw angle characteristic
7 and the negative pressure acting on the negative pressure pocket portion 19 is the constricted portion 2
1 reduces the effect of bearing action on the inflow side to the wake. The rear bearing surface 24 has the characteristics of a substantially independent plate bearing. By providing the constricted portion 21 on the inflow side from the longitudinal center of the slider 12, the area of the rear bearing surface 24 can be increased.
Further, the flying posture of the slider 12 can be adjusted by adjusting the position. As a result, the levitation force generated by the increase in speed becomes smaller than that in the conventional taper flat type. On the other hand, the inclined surface 14 is also provided on the inflow side of the cross rail 18,
The structure for increasing the positive pressure generation in the inflow portion increases the flying posture angle of the slider as the speed increases. Then, the levitation amount of the side rail rear end 22 of the rail side 17 that is in charge of the main positive pressure increases, and the levitation force generated behind the constricted portion decreases accordingly.

FIG. 7 is an explanatory diagram for explaining the velocity characteristic of the slider of the present invention. In contrast to the conventional taper flat type, the slider of the present invention can improve and adjust the floating speed characteristic of the outflow end of the center rail 20 in a region where the negative pressure of the negative pressure pocket portion 19 is small.

The use of a small negative pressure reduces the ratio of the negative pressure to the pressing load, and the negative pressure caused by variations in the dimensions of the negative pressure pocket 19 such as the depth of the negative pressure pocket 19 which has been a problem in practical use. This has the effect of suppressing pressure changes small and suppressing variations in flying height and flying characteristics. It also has the effect of pushing the dust collecting action due to the negative pressure during floating. There is also an effect of suppressing damage to the disk surface when the characteristics of the positive pressure bearing are deteriorated due to the adhesion of dust to the floating inclined surface 14. Further, in the contact start / stop method, it is possible to prevent the slider from hitting the medium due to a shock when not operating. As a result, it becomes possible to use the negative pressure utilizing slider by the contact start / stop method like the conventional positive pressure slider.

The groove 16 extending from the negative pressure pocket portion 19 provided on the cross rail 18 to the front end serves as a bypass function for the fluid flowing into the negative pressure pocket portion 19 and adjusts the expansion of the fluid in the negative pressure pocket portion 19. . As a result, the negative pressure generated can be reduced and adjusted.

FIG. 4 is an explanatory view showing the relationship between the depth of the negative pressure pocket portion 19 and the negative pressure constituting the first embodiment of the present invention. In this figure, the negative pressure decreases as the depth of the negative pressure pocket portion 19 increases at a depth of 4 μm or more where the floating velocity characteristic is improved. For example, in order to reduce the negative pressure to 2 gf, a depth of 20 μm is required without a groove, but with a groove 16 (groove width 200 μm in this study example) 10 μm
And can be realized with half the depth.

FIG. 5 is an explanatory diagram showing the relationship between the groove width and the negative pressure of the slider which constitutes the first embodiment of the present invention.
In this figure, the depth is constant. The negative pressure can be adjusted by appropriately selecting the groove width of the groove 16.
(For example, the negative pressure can be halved by providing the groove width of 100 μm.) The groove 16 is formed in the negative pressure pocket portion 1.
If the depth is the same as 9, it can be processed at once.

FIG. 6 is an explanatory view for explaining the groove width, the negative pressure pocket depth and the flying speed characteristic of the slider which constitutes the first embodiment of the present invention. In this figure, the vertical axis is the ratio of the flying height to the disk speed on the inner and outer circumferences. In the conventional case without a groove, if the depth of the negative pressure pocket portion 19 is shallower than 20 μm, the flying height ratio becomes 100% or less, and in the worst case, it does not fly on the outer peripheral side, whereas with the groove 16 the depth is 6 μm.
As described above, any characteristic can be selected. As a result, the negative pressure is reduced, the slider is stably floated, the cost is reduced by shortening the processing time, and the characteristics are stabilized by improving the depth accuracy. Furthermore, cross rail 18
Since the groove 16 becomes a negative pressure area with respect to the positive pressure area of the above, there is a dust discharging effect of discharging dust passing from the center out of the dust entering from the inflow side, avoiding the cross rail 18 and passing through the groove 16. .

FIG. 9 is an explanatory view showing the fluctuation of the flying height in the roll direction according to the first embodiment of the present invention, as viewed from the rear of the slider. In this figure, the access mechanism indicates the arrow 30 during seek operation.
When the slider 12 is moved in the radial direction by the acceleration α,
An inertial force F = mα acts on the center G of the mass of in the direction shown in the figure. The flying height variation Δh due to the rotation of the slider 12 in the roll direction, which is caused by this inertial force, is due to the rotation center P of the support body that supports the slider 12 from the center G of the slider mass.
Is approximately Lg, and the roll direction restoring spring rigidity of the air bearing that is floating at the outflow end flying height h2 is Kr, approximately expressed by equation (1).

Δh = mαLgLy / Kr (1) Ly is the distance from the center of the slider in the width direction.

The ratio of the fluctuation of the flying height at the end of the slider (distance Ls) and the fluctuation of the flying height at the end of the center rail 20 (distance Lc) is Δhs / Δhc = Ls / Lc (2), and the side rail is the outflow end. In the above case, the flying height variation at the end of the slider is the maximum and the flying height variation is the minimum, and the flying height variation at the end of the center rail 20 is small by the distance ratio.

FIG. 10 shows the relationship between the slider and the flying posture of the first embodiment of the present invention. In this figure, since the slider 12 floats due to the wedge effect of the gas bearing, the inflow side is lifted up by the angle θa and floats up. In this flying height variation state, the flying height (h2-Δh) at the end of the center rail 20.
The surface which is the same as that of c) is the ab surface, and the regions of the flying height below that are a, b and d.

FIG. 11 shows the region shown in FIG. 10 by the slider gas bearing surface. In this figure, a triangle A,
Areas B and D are the flying height of the end of the center rail 20 (h2
-[Delta] hc) or less, and the rear end 22 of the side rail 17 is moved in the inflow direction from the outflow end (A) of the slider 12 to (B) or more and is arranged in an area excluding the triangle ABD to perform a seek operation. Center rail 20 always
The minimum flying height can be set at the edge of.

The condition at the point (B) is x ≧ (Δhs−Δhc) / tan θa ≧ (1−Lc / Ls) Δhs / tan θa (3) where x is the distance from the slider outflow end to (B). , It depends on the ratio of angle and distance.

Next, the roll direction restoring spring rigidity Kr of the air bearing, which shows the magnitude of the flying height variation, is almost inversely proportional to the flying height. The flying height of (B) is hx = h2 + x · tan θa (4), and the roll direction restoring spring rigidity of the air bearing Kr is Kr∞h2 / hx = 1 / {1+ (1-Lc / Ls) Δhs / h2}. ... (5), and the rigidity is the term of the ratio of the distance of each rail (1-Lc / L
s) and the ratio of the flying height fluctuation at the slider end to the outflow end flying height Δ
It only decreases by hs / h2. For example, Lc / Ls =
Considering that 1/3 and Δhs is 20% of the outflow end flying height, the rigidity kr can be reduced to 15/17, and the fluctuation of the flying height at the end of the center head 20 can be reduced to Δhc = 17 / 45Δhs. The rigidity can be further reduced by providing the diagonal line segment portion 25 in which the rear end 22 of the side rail is arranged along the line segment AB in FIG.

FIG. 12 is an explanatory view for explaining the acceleration depression characteristic in the slider of the first embodiment of the present invention.
As can be seen from this figure, the flying height can be greatly improved in this embodiment as compared with the conventional slider.

When the area of the center rail 20 is made smaller than the sum of the areas of the side rails 17 on both sides behind the load point, the main levitation force is taken over by the side rails 17 and the roll rigidity itself is increased. be able to. Further, since the positive pressure generated in the center rail 20 is suppressed, there is an effect that the above-mentioned speed characteristic is realized with a further lower negative pressure. The positive pressure of the center rail 20 ensures pitch rigidity,
It acts to secure the disc following ability.

FIG. 13 is a perspective view showing a second embodiment of the present invention. This embodiment is an example in which the outside of the side rail 17 is formed by a straight line. The angle of change in rail width before and after the constricted portion 21 is approximately the same as the sum of the angles of change in both sides. By forming the outside of the side rail 17 with a straight line, the distance between the rail centers can be substantially increased and the roll rigidity can be improved. Further, there is an effect that the shape of the gas bearing surface is simplified and variations in the flying height due to dimensional errors during processing are suppressed.

FIG. 14 is a plan view for explaining the yaw angle characteristic of the second embodiment of the present invention. In this embodiment, in particular, the rear end of the side rail rear end 22 of the side rail 17 has a diagonal line segment 25 extending from the side toward the center of the outflow end. With this configuration, the length Lo from the constricted portion 21 to the side rail rear end 22 when there is no yaw angle to the length Lo from the constricted portion 21 to the side rail rear end 22 when there is a yaw angle. Lθy can be lengthened. As a result, the generated positive pressure can be increased, which has the effect of further suppressing the decrease in the flying height due to the yaw angle.

FIG. 15 is an explanatory view showing the relationship between the groove width and other dimensions of the second embodiment of the present invention shown in FIG. In this figure, the width e of the groove 16 is set to be smaller than the minimum distance f between the inside of the rear end 22 of the side rail and the center rail 20, including the above-described embodiment. Further, the width e of the groove 16 is set to be half or less of the maximum width g of the negative pressure pocket portion 19. With this configuration, negative pressure can be stably generated in the negative pressure pocket portion 19.

Further, the structure in which the pair of positive pressure air bearing surfaces does not reach the slider outflow end, and the width of the center positive pressure air bearing surface is set to the transducer mountable width, allows the minimum flying height position during slider flying to flow out to the center positive pressure air bearing surface. Since the roll rigidity by the pair of positive pressure air bearing surfaces is responsible for the force against the fluctuation of the flying height in the roll direction, the ratio of the central positive pressure air bearing surface outflow end width to the slider width hardly acts. In particular, even if the position of the rear side of the positive pressure air bearing surface on both sides is determined by the posture of the slider, the seek direction acceleration during seek, the slider roll rigidity, and the slider roll direction, the center positive pressure air bearing surface outflow end By selecting it so that it does not fall below the flying height, and by configuring it to have a line segment from the side toward the center positive pressure air bearing surface outflow end, the possibility of the minimum flying height can be determined as the center positive pressure air bearing surface outflow end,
It also makes it possible to increase roll rigidity. Side Ray
The rail 17 includes an inclined surface 14 on the inflow side and a flat surface portion 15, and has a constricted portion 21 in which the rail width once narrows from the inflow end toward the outflow end. In this embodiment, the width of both sides of the rail is changed.

FIG. 16 is a perspective view showing the third embodiment of the present invention. In this embodiment, the groove 16 is composed of a surface having substantially the same depth as the negative pressure pocket portion 19 and an inclined surface substantially the same as the inclined surface 14, and the peninsular portion protruding outside the groove 16 from the cross rail 18 to the outflow side. This is an example in which 23 is provided. Groove 1
The shape of 6 has the effect of enhancing the dust discharging effect. Slope 1
Since the machining of 4 is performed before the depth machining of the gas bearing surface, the shape error of the inclined surface 14 caused by the reverse machining sequence can be reduced,
It has the effect of shortening the processing time. The peninsula portion 23 adjacent to the groove 16 has a function of preventing the fluid from entering from the groove 16 and stabilizing the generation of negative pressure in the negative pressure pocket portion 19 surrounded by the peninsula portion 23 and the cross rail 18. By providing the peninsula portion 23, it is possible to widen the groove width of the groove 16 when the generated negative pressure is made constant.

FIG. 17 is a plan view showing the fourth embodiment of the present invention. In this embodiment, the groove 16 is provided in the middle of the cross rail 18. This configuration also has the same effect. It is also an example in which the notch 27 is provided at the rear end 22 of the side rail. By providing this cutout portion 27,
The negative pressure generated on the outflow side of the side rail rear end 22 is increased. As a result, there is an effect of improving speed characteristics.

FIG. 18 is a plan view showing the fifth embodiment of the present invention. This embodiment is an example in which the groove 16 and the groove width are not parallel to each other. This configuration also has the same effect. Since the width of the inclined surface 14 of the side rail 17 can be shortened, there is an effect of enhancing the dust discharging effect.

FIG. 19 is a plan view showing the sixth embodiment of the present invention. This embodiment is an example in which the groove 16 ends halfway along the inclined surface 14. Since the processing depth is constant and the gas inflow cross-sectional area on the inlet side of the groove 16 can be adjusted, the groove width can be adjusted widely. In addition, the peninsula portion 23 may have a varying width.

FIG. 20 is a sectional view taken along the line II of FIG. Depth machining step of negative pressure pocket 19 Angle θe
In this example, the angle is changed from 30 degrees to 60 degrees. Decreasing the angle θe including the other embodiments has the effect of offsetting the change in the negative pressure due to the variation in the depth of the negative pressure pocket portion 19 and the change in the positive pressure on the positive pressure rail, thereby reducing the change in the flying height.

FIG. 21 is a perspective view showing the seventh embodiment of the present invention. In this embodiment, the cross rail 18 is not provided with a groove. It is necessary to increase the depth of the negative pressure pocket portion 19, but other than that, the same effect is obtained.

FIG. 22 is a plan view showing the eighth embodiment of the present invention. FIG. 23 is a side view of FIG. In this embodiment, the side rails 17 and the center rail 20 of the gas bearing surface 13 are flat. A chamfer 28 is provided on the inflow side. This has the effects of improving the processing accuracy of the inclined surface 14 and shortening the time. Others have similar effects.

FIG. 24 is a plan view showing the ninth embodiment of the present invention. FIG. 25 is a side view of FIG. This embodiment is an example in which one groove 16 is provided at the center of the cross rail 18 and the center rail 20 is located just before the cross rail 18. The same effect is obtained except that the groove width of the groove 16 can be widened to reduce the change in the flying height due to the variation in the groove width.

FIG. 26 is a plan view showing the tenth embodiment of the present invention. 27 is a sectional view taken along the line II-II of FIG. This embodiment is an example in which the groove 16 is provided on the side rail 17 side and the side rail rear end 22 does not have an oblique line segment portion. The performance is slightly reduced, but there is a similar effect.

FIG. 28 is a diagram showing a linear type magnetic disk device equipped with the slider of the present invention. In this drawing, a guide arm 43 is connected to a carriage 44, a transducer support device 42 is connected to the guide arm 44, and a slider 12 having a transducer 11 mounted thereon is attached to the tip of the transducer support device 42. The slider 12 moves forward and backward in the radial direction of the recording medium 41 which is driven by the voice coil motor 45 and rotates. According to the present embodiment, the flying height at any position between the inner and outer circumferences can be made substantially constant, and the flying height fluctuation is small and the flying height is stable, so that the flying height of the slider can be made small and high density storage of the recording medium is realized. did it.

FIG. 29 is a perspective view showing a rotary (in-line) type magnetic disk device equipped with the slider of the present invention in a partial cross section. The slider 12 having the transducer 11 mounted thereon is attached to the tip of the transducer support device 42 coupled to the carriage 44.
Similar effects were obtained also in this example.

[0080]

As described above, according to the present invention, the flying velocity characteristic of the slider is substantially constant, the yaw angle characteristic is excellent, and the flying amount at any position on the disk can be controlled regardless of the access mechanism. It can be almost constant.

Further, it is possible to obtain a slider that suppresses the fluctuation of the flying height due to the acceleration at the time of seek and stably flies. Further, the floating characteristic is good and the sliding resistance is excellent, and it is possible to avoid dust from adhering to the slider inflow side gas bearing surface.

Further, by the negative pressure adjusting means, there is an effect that the groove is easily machined and excellent in workability.

[Brief description of drawings]

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

2 is a perspective view showing a pressure distribution state of the first embodiment of the slider of the present invention shown in FIG. 1. FIG.

FIG. 3 is a side view of the pressure distribution shown in FIG.

FIG. 4 is a characteristic diagram showing the relationship between the depth of the negative pressure pocket portion and the negative pressure which constitute the first embodiment of the slider of the present invention shown in FIG.

5 is a characteristic diagram showing the relationship between the groove width and the negative pressure which constitutes the first embodiment of the slider of the present invention shown in FIG.

FIG. 6 is a characteristic diagram showing a groove width, a negative pressure pocket portion depth and a flying speed characteristic which constitute the first embodiment of the slider of the present invention shown in FIG.

FIG. 7 is a characteristic diagram illustrating velocity characteristics of the slider according to the first embodiment of the present invention shown in FIG.

FIG. 8 is a characteristic diagram for explaining the yaw angle characteristic of the first embodiment of the slider of the present invention shown in FIG.

FIG. 9 is an explanatory view showing the fluctuation in the roll direction of the slider according to the first embodiment of the present invention shown in FIG. 1, as seen from the rear of the slider.

10 is a side view showing the relationship between the slider flying posture of the first embodiment of the slider of the present invention shown in FIG. 1. FIG.

11 is a plan view showing a region of a slider gas bearing surface shown in FIG.

FIG. 12 is a characteristic diagram illustrating the acceleration depression characteristic of the first embodiment of the slider of the present invention shown in FIG.

FIG. 13 is a perspective view showing a second embodiment of the slider of the present invention.

FIG. 14 is a plan view illustrating the yaw angle characteristic of the second embodiment of the slider of the present invention.

15 is a plan view showing the relationship between the groove width and other dimensions of the second embodiment of the slider of the present invention shown in FIG.

FIG. 16 is a perspective view showing a third embodiment of the slider of the present invention.

FIG. 17 is a plan view showing a fourth embodiment of the slider of the present invention.

FIG. 18 is a plan view showing a fifth embodiment of the slider of the present invention.

FIG. 19 is a plan view showing a sixth embodiment of the slider of the present invention.

20 is a sectional view of the slider of the present invention shown in FIG. 19 taken along the line II of the sixth embodiment.

FIG. 21 is a perspective view showing a seventh embodiment of the slider of the present invention.

FIG. 22 is a plan view showing an eighth embodiment of the slider of the present invention.

FIG. 23 is a side view of the eighth embodiment of the slider of the present invention shown in FIG.

FIG. 24 is a plan view showing a ninth embodiment of the slider of the present invention.

25 is a side view of the ninth embodiment of the slider of the present invention shown in FIG. 24. FIG.

FIG. 26 is a plan view showing a tenth embodiment of the slider of the present invention.

27 is a cross-sectional view taken along the line II-II of the tenth embodiment of the slider of the present invention shown in FIG.

FIG. 28 is a vertical cross-sectional view showing an example of a magnetic disk device equipped with the slider of the present invention.

FIG. 29 is a perspective view showing another example of a magnetic disk device equipped with the slider of the present invention in a partial cross section.

[Explanation of symbols]

1 ... Magnetic head, 2 ... Slider, 3 ... Gas bearing surface, 4 ...
Inclined surface, 5 ... Plane part, 6 ... Bleed part, 7 ... Side rail, 8 ... Cross rail, 9 ... Negative pressure pocket, 10 ... Center rail, 11 ... Transducer, 12 ... Slider, 13 ... Gas bearing surface, 14 ... Inclined surface, 15 ... plane part,
16 ... Groove, 17 ... Side rail (positive pressure generating surface), 18 ...
Cross rail, 19 ... Negative pressure generating concave portion, 20 ... Center rail (center positive pressure generating surface), 21 ... Constricted portion, 22 ... Side positive pressure generating surface rear end, 23 ... Peninsula portion, 24 ... Rear bearing surface,
25 ... Diagonal line segment part, 26 ... Center rail spread part, 2
7 ... notch part, 28 ... chamfer, 41 ... recording medium,
42 ... Transducer support device, 43 ... Guide arm, 44 ... Carriage, 45 ... Voice coil motor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Kami 2880 Kunizu, Odawara, Kanagawa Stock Company Hitachi Storage Systems Division (72) Inventor Takemasa Shimizu 2880 Kunizu, Odawara, Kanagawa Hitachi, Ltd. In-house Storage Systems Division (72) Inventor Satellite Togawa Satellite 2880, Kozu, Odawara City, Kanagawa Stock Company Hitachi Storage Systems Division (72) Inventor Yasushi Kojima 2880, Kozu, Odawara City, Kanagawa Hitachi Storage Systems Business Department

Claims (14)

[Claims] 1. A gas bearing surface of a slider, which is arranged to face a rotating storage medium, has a pair of positive pressure generating surfaces on both sides.
A cross rail connecting the positive pressure generating surfaces in the same plane on the inflow side of the positive pressure generating surface, and a reverse step shape surrounded by the positive pressure generating surface and the cross rail behind the cross rail. In the negative pressure utilizing type floating head slider having the concave portion of, the pair of positive pressure air bearing surfaces has a constricted portion where the rail width once narrows from the front to the rear end, and the rail width widens toward the rear end. Moreover, it has a structure that does not reach the rear ends of both sides, and has a central positive pressure air bearing surface that is substantially the same as the pair of positive pressure air bearing surfaces at the center of the outflow portion of the gas bearing surface of the slider. A floating head slider that is equipped with a transducer at its end. 2. A pair of positive pressure generating surfaces on both sides of a gas bearing surface of a slider which is arranged so as to face a rotating storage medium, and a flat surface between the positive pressure generating surfaces on the inflow side of the positive pressure generating surfaces. A negative pressure utilizing type floating head slider having a cross rail connected to the inside of the cross rail, and having the positive pressure generating surface and a recess of a reverse step surrounded by the cross rail at the rear of the cross rail. The pressure-bearing surface has a constriction where the width of the air bearing surface narrows from the front to the rear end, the width of the air bearing surface widens toward the rear end, and does not reach the rear ends of both sides. The central positive pressure air bearing surface extends from the cross rail that divides the recess into two parts to the center of the outflow portion of the gas bearing surface, and the central positive pressure air bearing surface has an air bearing surface width on the outflow side from the center in the slider length direction. It has a structure that expands Floating head slider, characterized in that mounting the transducer on the rear end of HisashiTadashi圧 generating surface. 3. A pair of positive pressure generating surfaces on both sides of a gas bearing surface of a slider arranged facing a rotating storage medium, and the positive pressure generating surfaces on the inflow side of the positive pressure generating surface are flush with each other. A negative pressure utilizing type floating head slider having a cross rail connected to the inside of the cross rail, and having the positive pressure generating surface and a recess of a reverse step surrounded by the cross rail at the rear of the cross rail. The pressure-bearing surface has a constriction where the width of the air bearing surface narrows from the front to the rear end, the width of the air bearing surface widens toward the rear end, and does not reach the rear ends of both sides. The central positive pressure air bearing surface extends from the cross rail that divides the reverse step-shaped recess into two parts to the center of the outflow portion of the gas bearing surface, and the central positive pressure air bearing surface is on the outflow side from the center in the slider length direction. Wider air bearing surface A floating head slider characterized in that a groove having the same depth as one or more recesses communicating from the recess to the front end is provided in the cross rail, and a transducer is mounted at the rear end of the central positive pressure generating surface. . 4. A pair of positive pressure generating surfaces on both sides of a gas bearing surface of a slider arranged facing a rotating storage medium, and the positive pressure generating surfaces on the inflow side of the positive pressure generating surface are flush with each other. A negative pressure utilizing type floating head slider having a cross rail connected to the inside of the cross rail, and having the positive pressure generating surface and a recess of a reverse step surrounded by the cross rail at the rear of the cross rail. The pressure-bearing surface has a constriction where the outside is substantially straight and the side in contact with the recess is such that the width of the air-bearing surface is once narrowed from the front to the rear end. It has a structure that does not reach, and has a central positive pressure air bearing surface that extends from the cross rail that divides the reverse step-shaped recess into two in the widthwise central portion of the slider to the center of the outflow portion of the gas bearing surface. , Slider length The cross-rail has a structure in which the width of the air bearing surface widens from the center toward the outflow side, and a groove having the same depth as one or more recesses leading from the recess to the front end is provided in the cross rail, and a transducer is provided at the rear end of the central positive pressure generating surface. A floating head slider characterized by being equipped with. 5. A pair of positive pressure generating surfaces on both sides of a gas bearing surface of a slider arranged facing a rotating storage medium, and the positive pressure generating surfaces on the inflow side of the positive pressure generating surface are flush with each other. A negative pressure utilizing type floating head slider having a cross rail connected to the inside of the cross rail, and having the positive pressure generating surface and a recess of a reverse step surrounded by the cross rail at the rear of the cross rail. The pressure-bearing surface has a constriction where the width of the air bearing surface narrows from the front to the rear end, the width of the air bearing surface widens toward the rear end, and the rear end forms a line segment from the slider side toward the center of the outflow end at an obtuse angle. And a central positive pressure air bearing surface extending from the cross rail that divides the recess into two into the center of the outflow portion of the gas bearing surface, and has a structure that does not reach the rear ends of both sides. Positive pressure air bearing surface The cross-rail has a structure in which the air-bearing surface width widens from the center in the lengthwise direction on the outflow side, and the cross rail is provided with a groove having the same depth as one or more recesses leading from the recess to the front end. A floating head slider that is equipped with a transducer at its end. 6. A pair of positive pressure generating surfaces on both sides of a gas bearing surface of a slider arranged facing a rotating storage medium, and the positive pressure generating surfaces on the inflow side of the positive pressure generating surface are flush with each other. A negative pressure utilizing type floating head slider having a cross rail connected to the inside of the cross rail, and having the positive pressure generating surface and a recess of a reverse step surrounded by the cross rail at the rear of the cross rail. The pressure-bearing surface has a constriction where the width of the air bearing surface narrows from the front to the rear end, the width of the air bearing surface widens toward the rear end, and the rear end forms a line segment from the slider side toward the center of the outflow end at an obtuse angle. And a central positive pressure air bearing surface extending from the cross rail that divides the recess into two into the center of the outflow portion of the gas bearing surface, and has a structure that does not reach the rear ends of both sides. Positive pressure air bearing surface The cross rail has a structure in which the width of the air bearing surface widens on the outflow side from the center in the longitudinal direction, and the cross rail is provided with a groove having the same depth as one or more recesses leading from the recess to the front end, and the groove width is a recess having a wake. A floating head slider having a width equal to or less than ½ of the maximum width and having a transducer mounted at the rear end of the central positive pressure generating surface. 7. A pair of positive pressure generating surfaces on both sides of a gas bearing surface of a slider arranged facing a rotating storage medium, and the positive pressure generating surfaces on the inflow side of the positive pressure generating surface are flush with each other. A negative pressure utilizing type floating head slider having a cross rail connected to the inside of the cross rail, and having the positive pressure generating surface and a recess of a reverse step surrounded by the cross rail at the rear of the cross rail. The pressure-bearing surface has a constriction where the width of the air bearing surface narrows from the front to the rear end, the width of the air bearing surface widens toward the rear end, and the rear end forms a line segment from the slider side toward the center of the outflow end at an obtuse angle. And a central positive pressure air bearing surface extending from the cross rail that divides the recess into two into the center of the outflow portion of the gas bearing surface, and has a structure that does not reach the rear ends of both sides. Positive pressure air bearing surface The cross-rail has a structure in which the air-bearing surface width widens from the center in the length direction on the outflow side, and the cross rail is provided with a groove having the same depth as one or more recesses leading from the recess to the front end. A floating head slider characterized in that the transducer is mounted at the rear end of the central positive pressure generating surface, the width being narrower than the minimum width between the pair of positive pressure generating surfaces and the central positive pressure generating surface. 8. A pair of positive pressure generating surfaces on both sides of a gas bearing surface of a slider arranged facing a rotating storage medium, and a flat surface between the positive pressure generating surfaces on the inflow side of the positive pressure generating surfaces. A negative pressure utilizing type floating head slider having a cross rail connected to the inside of the cross rail, and having the positive pressure generating surface and a recess of a reverse step surrounded by the cross rail at the rear of the cross rail. The pressure-bearing surface has a constriction where the width of the air bearing surface narrows from the front to the rear end, the width of the air bearing surface widens toward the rear end, and the rear end forms a line segment from the slider side toward the center of the outflow end at an obtuse angle. And a central positive pressure air bearing surface extending from the cross rail that divides the recess into two into the center of the outflow portion of the gas bearing surface, and has a structure that does not reach the rear ends of both sides. Positive pressure air bearing surface The cross-section has a structure in which the width of the air bearing surface widens from the center in the longitudinal direction to the outflow side, and a groove having the same depth as the recess communicating from the recess to the front end is provided along the central positive pressure air bearing surface of the cross rail, and outside the groove. The floating head slider, wherein a peninsular portion extending from the cross rail to the outflow side is provided, and a transducer is mounted at the rear end of the central positive pressure generating surface. 9. A pair of positive pressure generating surfaces on both sides of a gas bearing surface of a slider arranged facing a rotating storage medium, and the positive pressure generating surfaces on the inflow side of the positive pressure generating surface are flush with each other. A negative pressure utilizing type floating head slider having a cross rail connected to the inside of the cross rail, and having the positive pressure generating surface and a recess of a reverse step surrounded by the cross rail at the rear of the cross rail. The pressure-bearing surface has a constriction where the width of the air bearing surface gradually narrows from the front to the rear end, the width of the air bearing surface widens toward the rear end, and does not reach the rear ends of both sides. Has a central positive pressure air bearing surface that is divided into two parts, extends to the center of the outflow portion of the gas bearing surface, and the air bearing surface width widens on the outflow side, and the central positive pressure air bearing surface is on the outflow side from the load point of the slider. Area of positive pressure generated on both sides Floating head slider, wherein the smaller than the sum of the areas. 10. Arranged to face a rotating storage medium,
A floating head slider comprising: a slider on which a transducer is mounted; and a gas bearing surface which is formed on a surface of the slider facing the storage medium and which is floated by a positive pressure generated by a gas flow accompanying the rotation of the storage medium. The slider has a front end and a rear end, and a pair of positive pressure generating surfaces are arranged on both sides of the gas bearing surface, and the positive pressure generating surface does not reach the slider rear end, and the positive pressure generating surface rear end. Has an obtuse line segment from the slider side to the center of the slider outflow end, the central positive pressure generating surface is arranged at the central rear end of the gas bearing surface, and the transducer is mounted at the rear end of the central positive pressure generating surface. A floating head slider characterized in that 11. The floating head slider according to claim 1, wherein the constricted portion of the gas bearing rail is provided closer to the front end side than the center of the slider front end and rear end. 12. The distance between both side ends of the rear end of the gas bearing rail from the slider rear end is longer than the distance from the slider rear end on the slider center side of the rear end of the gas bearing rail. The floating head slider according to any one of claims 1 to 11. 13. The floating head slider according to claim 1, wherein the entire positive pressure generating surface of the gas bearing surface is a flat surface. 14. A rotating disk storage device, wherein the floating head slider according to claim 1 is mounted.