JPH09128921A - Negative-pressure slider for hard disk driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a negative pressure slider capable of preventing the accumulation of foreign matters, facilitating the adjustment of a negative pressure in terms of design and keeping a stable flight height by attaining a specified shape. SOLUTION: First element rails 110a projected on an air flow-in side on a body with a prescribed height and composed of one or more parts and a second element rail 110b projected with the prescribed height between the rails are formed. Then, by forming a channel 160 for air discharge for transmitting air flowing in between both rails to the rear part of the body, the air flowing into a positive pressure void part 170 is discharged through the channel 160 to both sides of the body and the accumulation of the foreign matters is prevented. Further, a negative pressure void part 150 between the positive pressure void part 170 and the second elements rail 110b is isolated by a U-shaped cross rail 130 and projection parts 111 are formed oppositely to the second element rails 110b. By the interval adjustment of the projection parts and the adjustment of the air bering surface of both rails, the negative pressure and positive pressure are adjusted and this slider is made to fly in an optimum state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a negative pressure slider for a hard disk driver, and more particularly to a negative pressure slider for a hard disk driver which maximizes flight stability.

[0002]

2. Description of the Related Art Basic requirements for a slider of a head used for a high capacity hard disk driver (HDD) include:
Stable flight conditions due to flight altitude and air stiffness that maintain a constant height regardless of the fast take-off of the disk, which is an important factor for HDD reliability, and some skew angles generated by a rotary type actuator,
There is a minimized roll angle.

Several types of sliders used in the present industry satisfy such various conditions, and the mainstream type of slider is NPAB (Negat).
ivePressure Air Bearing) According to the form design.

As mentioned above, the flight altitude is one of the most important factors of the recording apparatus, and the lower the flight altitude of the slider, the higher the resolution of the data bits of the disk. Therefore, it is desirable to fly the slider as close to the disc as possible. Moreover, it is necessary to maintain a constant flight altitude regardless of changes in tangential velocity during slider flight, lateral motion of the slider during data retrieval, and changes in skew angle.

Usually, the slider flies with a pitch angle of a certain value or more, and the flight altitude behind the slider is lower than the flight altitude in front of the slider due to the pitch angle. Therefore, the transducer, which should be located as low as possible, is located behind the slider.

FIG. 7 is a schematic perspective view of a conventional taper flat slider.

AB in the longitudinal direction on the body 10a on a thin hexahedron
Side-by-side rails 11 with S (Air Bearing Surface)
a is projected and formed at a predetermined height, and a slope 12a is formed at each one end of both rails 11a.

According to this structure, when the disk rotates, the air rotates together with the disk due to surface friction with the disk. Also, when air passes between the disc and the slider, it is compressed, but the pressure at this time imparts a hydrodynamic levitation force to the slider,
This slider allows you to fly without touching the disc.

[0009]

However, such a conventional slider has a drawback that the flight altitude changes abruptly according to the change of the skew angle. At high flight altitudes of 3.0 microinches and above, such changes in flight altitude did not significantly affect the writing and reading of information to the disk. However, under the current condition of low flight altitude of 2.0 micro inches or less, the difference in the flight height significantly affects the function of the HDD head according to the change of the skew angle.

In order to solve the above problems of the conventional slider, US Pat. No. 4,673,996 discloses a TPC (Transver
A slider of the se Pressure Contour type was proposed.

As shown in FIG. 8, this is because the rails 11b, 11b formed on the body 10b have ramps on both side edges in the width direction.
It has a structure in which 111b is provided. Therefore, the rail 11b has a sloped surface 12b at its tip and ramps 111b on both sides thereof.
Will be equipped with.

The slider having the TPC structure as described above has an advantage of maintaining a constant flight altitude regardless of the skew angle. However, insufficient air stiffness due to a decrease in ABS width may cause a problem of flight reliability of the slider. was there.

Therefore, most ABS used at present low flight altitudes are NPAB-type sliders with some modifications.

FIG. 9 shows an example of an NPAB type slider. This has the basic structure of the slider shown in FIG. 7, and further has a structure in which a cross rail connecting both rails is provided.

That is, as shown in FIG. 9, rails 11c each having a slope 12c at each end are formed side by side on one surface of the body 10c, and the body is close to the slope 12c.
Rail 1 with negative pressure cavity 14c in the center of the bottom of 10c
A cross rail 13c having the same height as 1c is formed between the rails 11c.

This is because when the slider flies over the disk, the air that has passed through the cross rails 13c has a negative pressure cavity portion 14.
It is designed to maintain a sufficient air stiffness even under a light load of NPAB by exerting a force that pulls the slider toward the disc as it is diffused while passing through c.

Since such a small load of the slider of the NPAB type has a remarkable effect on the CSS (Contact Start Stop) function, the NPAB slider is often used in the present HDD.

However, the above-mentioned NPAB slider has the drawback that it is difficult to adjust the negative pressure, and the foreign matter introduced between the rails on the slope side is suppressed from being discharged by the cross rails and accumulated on the inner surface of the slider.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to prevent accumulation of foreign matter between rails and to easily design a negative pressure in a hard disk driver. To provide a negative pressure slider for.

Another object of the present invention is to provide a further improved negative pressure slider for a hard disk driver which can maintain a constant flight altitude regardless of the skew angle.

Still another object of the present invention is to further improve the negative pressure for a hard disk driver, which enables stable flight due to the minimized rolling and maintenance of the air stiffness and the optimized pitch angle. To provide a slider.

[0022]

In order to achieve the above-mentioned object, a negative pressure slider for a hard disk driver according to a first aspect of the present invention protrudes toward the air inflow side on the body at a predetermined height. And a second element rail formed to have a predetermined height between the first element rail including at least one portion and the first element rail on the body. And a front end portion of the first element rail on the air inflow side and a front end portion of the second element rail on the air inflow side, for discharging the inflowing air to the rear of the body. A channel, a positive pressure cavity surrounded by an inner part of the body of the first element rail, the second element rail and the channel for discharging air, and an inner part of the body of the second element rail. With the negative pressure cavity that became Wherein adjacent to the negative pressure sinus portion, and summarized in that and a projecting portion formed at the tip of the air discharge side of the second element rail. Therefore, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design. Also,
It is possible to maintain a constant flight altitude regardless of the skew angle.

A second aspect of the present invention is summarized in that both end surfaces of the second element rail, which are not adjacent to the positive pressure cavity portion, are formed of at least two step layers. Therefore, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design.

According to a third aspect of the present invention, the second element rail is formed in a horizontal U-shape on the body,
The gist is that it is located between the first element rails of the U-shaped corner portion. Therefore, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design.

A fourth aspect of the present invention is summarized in that the second element rails are connected to each other without being short-circuited. Therefore, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design.

According to a fifth aspect of the present invention, in the second aspect, the positive pressure cavity portion and the negative pressure cavity portion are connected to each other.
The gist is that a part of the element rail is formed to penetrate and the second element rail is short-circuited to one or more parts. Therefore, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design.

A sixth aspect of the present invention is summarized in that the first element rail is composed of two portions based on a U-shaped corner portion of the second element rail. Therefore, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design.

According to a seventh aspect of the present invention, the protrusions formed at the tips of the second element rails on the air discharge side have mutually spaced apart portions of the tips of the second element rails on the air discharge side. The gist is to have a structure in which a predetermined length is extended and formed inward of the body so as to face each other. Therefore, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design.

The eighth aspect of the present invention is summarized as the front end portion of the first element rail on the air inflow side is formed to be inclined at a predetermined angle. Therefore, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design.

According to a ninth aspect of the present invention, which is formed so as to project at a predetermined height on the air inflow side on the body,
A first element rail comprising at least one or more parts,
It is formed so as to project at a predetermined height on the body,
Between a two-element rail composed of at least one portion between the first element rails, between a rear end portion of the first element rail on the air inflow side and a front end portion of the second element rail on the air inflow side. And is surrounded by the air discharge channel for transmitting the inflowing air to the rear of the body, the body inner portion of the first element rail, the second element rail, and the air discharge channel. A positive pressure hollow portion, a negative pressure hollow portion surrounded by a body inner portion of the second element rail, and a negative pressure hollow portion adjacent to the negative pressure hollow portion, and formed at the tip of the second element rail on the air discharge side. The gist of the present invention is to include a protrusion and at least one opening penetratingly formed in a part of the second element rail so as to connect the positive pressure cavity and the negative pressure cavity. Therefore, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design. Further, it is possible to maintain a constant flight altitude regardless of the skew angle. In addition, minimized rolling and maintenance of air stiffness and optimized pitch angle enable stable flight.

A tenth aspect of the present invention is characterized in that both end surfaces of the second element rail which are not adjacent to the positive pressure hollow portion are separately formed into at least two step layers. Therefore, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design.

According to an eleventh aspect of the present invention, the second element rail is formed in a horizontal U-shape on the body, and the U-shaped corner portion is located between the first element rails. Positioning is the gist. Therefore, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design.

The twelfth aspect of the present invention is based on the twelfth aspect of the invention, wherein the first element rail is composed of two portions based on a U-shaped corner portion of the second element rail. Therefore, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design.

A thirteenth aspect of the present invention is summarized as the opening is formed at a corner of the U-shaped second element rail. Therefore, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design.

According to a fourteenth aspect of the present invention, in the projecting portion formed at the tip of the second element rail on the air discharge side, the separated portions of the tip of the second element rail on the air discharge side face each other. The gist of the present invention is to have a structure in which a predetermined length is extended and formed inward in the body. Therefore, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design.

A fifteenth aspect of the invention is characterized in that the tip portion of the first element on the air inflow side is formed to be inclined at a predetermined angle. Therefore, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of an embodiment of a negative pressure slider for a hard disk driver according to the present invention, and FIG. 2 is a plan view thereof.

As shown in FIGS. 1 and 2, a rail 110 is provided on the body 100 like an existing slider.

The rails 110 provided on both sides of the body 100 in the longitudinal direction are separated into a first element rail 110a on the air inflow side and a second element rail 110b on the air exhaust side. Then, the first element rail 110a of each rail 110
A channel 160 for air discharge is provided between the first element rail 110a and the second element rail 110b. The channel 160 is arranged in the forward direction of the air inflow direction.
The air that has flowed into the positive pressure cavity 170 between them is discharged to both sides of the body 100 through the channels 160 on both sides. Therefore, accumulation of foreign matter such as existing sliders does not occur.

The second element rails 110b, 1 of the both rails 110
The first element rail side end of 10b is a U-shaped cross rail 130
Therefore, the positive pressure cavity 170 between the first element rails 110a and the negative pressure cavity 150 between the second element rails 110b are separated by the cross rail 130.

The air discharge side of the negative pressure cavity portion 150 has a protruding portion 111 formed inside the second element rail 110b facing each other.
However, the degree of diffusion by the negative pressure cavity portion 150 can be adjusted by adjusting these intervals, and the positive pressure can be increased by expanding the ABS (Air Bearing Surface). That is, the ABS of the first element rail and the second element rail of both rails that provide levitation force to the slider.
It is possible to increase the levitation force through the expansion of and simultaneously reduce the attractive force pulling the slider on the disc. Therefore, in order to adjust the size of the first element rail 110a and the second element rail 110b, it is possible to fly a slider with a smaller load in an optimum state and perform CSS (Contact Start Stop).
The performance can be maximized.

On the other hand, FIG. 3 shows the structure of the second embodiment in which the flight stability of the slider is further improved.

The general structure except the cross rail is the same as that of the first embodiment.

The second element rails 110b of both rails 110 are connected to each other by a U-shaped cross rail 130 such as a trench type or a V type having an opening 131 provided therebetween. Therefore, the positive pressure cavity 170 between the first element rails 110a
The negative pressure cavity 150 between the second element rail 110b and the second element rail 110b are connected to each other through the opening 131 of the cross rail 130.

According to the above structure, the levitation force is increased by expanding the surfaces of the first element rail 110a and the second element rail 110b of the two rails that provide levitation force to the slider, that is, ABS, and at the same time, the slider is moved to the disk. The attractive force pulling to is reduced. Therefore, the first element rail 110a and the second element rail 110a
By adjusting the size of the element rail 110b and the cross rail and adjusting the space between the opening 131 and the protrusion 111 of the cross rail 130, the slider can fly at a height at which the attractive force due to the negative pressure and the gram load and the levitation force are offset. The CSS performance can be further maximized.

FIG. 4 shows a slider according to the third embodiment for stable flight in which a constant flight altitude is maintained and rolling is minimized by lateral movement for data retrieval, as compared with the above-described embodiment. The structure of is shown.

The slider shown here has the structure of the above-mentioned first embodiment, and further has a structure in which step portions 112a and 112b are formed on both side edges of each second element rail 110b of both rails. .

In the third embodiment as described above, the skew angle required is too large, and in view of various related instrument design and transducer conditions, a slider with stable flight conditions having the structure of the above embodiment is designed. It is a desirable embodiment that can be applied when it is not possible.

In this embodiment, the cross rail 130 has an integral structure as in the first embodiment, but in this case as well, it can be separated as in the second embodiment if necessary.

The slider of the present invention, which can be deformed into various forms by such an embodiment, is suitable for an HDD having a micro flight height of 2.0 micro inches or less.

As shown in FIG. 5, in the slider of the present invention, the middle part of the data area of the disk maintains a slightly higher flight altitude than both sides thereof, but the data area is generally close to the center of the disk. It can be seen that it maintains a very stable flight altitude within a 5% deviation of around 2.00E-06 inches from the to the outer data area.

Further, as shown in FIG. 6, even in the rolling of the slider, the entire area of the disk is covered.
5.00E-Maintains a small difference of 06 inches or less.

[0054]

As described above, the negative pressure slider for the hard disk driver of the first invention is formed so as to be projected at a predetermined height on the air inflow side on the body,
A first element rail comprising at least one or more parts,
A second element rail formed to protrude at a predetermined height between the first element rails on the body, a rear end portion of the first element rail on an air inflow side, and the second element rail. A channel for air discharge formed between the air inflow side front end of the first element rail and the air inflow side rear end of the body, a body inner portion of the first element rail, the second element rail, and the air. A positive pressure cavity surrounded by a discharge channel, a negative pressure cavity surrounded by a body inner portion of the second element rail, and a second pressure element adjacent to the negative pressure cavity. Since it includes a protrusion formed at the tip of the rail on the air discharge side, it has a very stable flight altitude and a minimized rolling angle, and in particular, because accumulation of foreign matter is structurally suppressed, the HDD The reliability of can be considerably increased.

In the second invention, since both end surfaces of the second element rail which are not adjacent to the positive pressure hollow portion are formed by at least two or more stair layers, accumulation of foreign matter between the rails is prevented and the design is improved. Negative pressure can be adjusted easily.

In a third aspect of the invention, the second element rail is formed in a horizontal U shape on the body, and is located between the first element rails at the corners of the U shape. Accumulation of foreign matter is prevented, and the negative pressure can be easily adjusted by design.

In the fourth aspect of the invention, since the second element rails are connected to each other without being short-circuited, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design.

According to a fifth aspect of the present invention, a part of the second element rail is formed so as to penetrate therethrough so that the positive pressure cavity portion and the negative pressure cavity portion are connected to each other. Since it is short-circuited to the part of, the accumulation of foreign matter between rails is prevented,
The negative pressure can be adjusted easily by design.

In the sixth invention, since the first element rail is composed of two parts based on the U-shaped corner portion of the second element rail, accumulation of foreign matter between the rails is prevented, and by design. Negative pressure can be adjusted easily.

In a seventh aspect of the present invention, the protruding portion formed at the tip of the second element rail on the air discharge side of the fuselage is such that the separated portions of the tips of the second element rails on the air discharge side face each other. Since it has a structure in which a predetermined length is extended inward, accumulation of foreign matter between rails is prevented, and the negative pressure can be easily adjusted by design.

In the eighth invention, since the front end portion of the first element rail on the air inflow side is formed to be inclined at a predetermined angle, accumulation of foreign matter between the rails is prevented, and the negative pressure is adjusted by design. Can be done easily.

In a ninth aspect of the present invention, a first element rail formed of at least one portion is formed so as to project at a predetermined height on the air inflow side of the body, and a predetermined height above the body. A two-element rail that is formed so as to project from the first element rail and is composed of at least one portion between the first element rail, a rear end portion of the first element rail on the air inflow side, and the second element rail. A channel for discharging air, which is formed between the front end of the air inflow side and transmits the inflowing air to the rear of the body, an inner part of the body of the first element rail, the second element rail, and the air discharge. Of the second element rail, a positive pressure cavity surrounded by a channel for use with the negative pressure cavity, a negative pressure cavity surrounded by a body inner side portion of the second element rail, and a negative pressure cavity adjacent to the negative pressure cavity. A protrusion formed at the tip on the air discharge side And parts, because it contains said positive pressure sinus portion and at least one opening formed through a portion of the second element rail such that the that the negative pressure sinus portion is connected,
Accumulation of foreign matter between rails is prevented, and negative pressure can be easily adjusted by design. Further, it is possible to maintain a constant flight altitude regardless of the skew angle. In addition, minimized rolling and maintenance of air stiffness and optimized pitch angle enable stable flight.

In the tenth aspect of the present invention, since both end surfaces of the second element rail which are not adjacent to the positive pressure hollow portion are separated and formed into at least two or more stair layers, accumulation of foreign matter between rails is prevented, and design is performed. The upper negative pressure can be adjusted easily.

In the eleventh aspect of the invention, the second element rail is formed in a horizontal U shape on the body, and the U-shaped corner portion is located between the first element rails. Foreign matter is prevented from accumulating during that time, and the negative pressure can be easily adjusted by design.

In the twelfth aspect of the invention, since the first element rail is composed of two parts based on the U-shaped corner of the second element rail, accumulation of foreign matter between the rails is prevented, and a negative design. The pressure can be adjusted easily.

In the thirteenth invention, since the opening is formed at the corner of the U-shaped second element rail, accumulation of foreign matter between the rails is prevented, and the negative pressure can be easily adjusted by design.

In a fourteenth aspect of the present invention, the protrusion formed at the tip of the second element rail on the air discharge side is inside the body so that the separated portions of the tips of the second element rail on the air discharge side face each other. Since it has a structure in which a predetermined length is extended in the direction, accumulation of foreign matter between rails is prevented, and the negative pressure can be easily adjusted by design.

In the fifteenth aspect of the invention, since the tip portion of the first element on the air inflow side is formed to be inclined at a predetermined angle, accumulation of foreign matter between rails is prevented, and the negative pressure can be adjusted by design. You can easily.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of a negative pressure slider for a hard disk driver according to the present invention.

FIG. 2 is a plan view of the slider according to the first embodiment shown in FIG.

FIG. 3 is a perspective view of a second embodiment of a slider according to the present invention.

FIG. 4 is a perspective view of a slider according to a third embodiment of the present invention.

FIG. 5 is a diagram showing a change in flight altitude according to a radius of a disk of a slider according to the present invention.

FIG. 6 is a diagram of a rolling angle change according to a disk radius of a slider according to the present invention.

FIG. 7 is a schematic perspective view of a conventional taper flat slider.

FIG. 8 is a schematic perspective view of a conventional TPC type slider.

FIG. 9 is a schematic perspective view of a conventional NPAB type slider.

[Explanation of symbols]

 110a 1st element rail 110b 2nd element rail 111 Protrusions 112a, 112b Stairs 120 Slope 130 Cross rail 131 Opening 160 Air discharge channel 170 Positive pressure cavity

Claims (15)

[Claims] 1. A first element rail formed of at least one portion and formed to project at a predetermined height on an air inflow side on the body, and between the first element rail on the body. A second element rail formed so as to project at a predetermined height, between a rear end portion of the first element rail on the air inflow side and a front end portion of the second element rail on the air inflow side. A positive channel that is formed and is surrounded by an air exhaust channel for transmitting the inflowing air to the rear of the body, an inner body part of the first element rail, the second element rail, and the air exhaust channel. A pressure cavity portion, a negative pressure cavity portion surrounded by a body inner side portion of the second element rail, and a negative pressure cavity portion that is adjacent to the negative pressure cavity portion and is formed at a tip of the second element rail on the air discharge side. A hardware including a protrusion The negative pressure slider for I disk driver. 2. The negative pressure for a hard disk driver according to claim 1, wherein both end surfaces of the second element rail that are not adjacent to the positive pressure cavity are formed of at least two step layers. slider. 3. The second element rail is formed in a horizontal U-shape on the body, and is located between the first element rails at the corners of the U-shape. Alternatively, the negative pressure slider for the hard disk driver according to claim 2. 4. The negative pressure slider for a hard disk driver according to claim 3, wherein the second element rails are connected to each other without being short-circuited. 5. A part of the second element rail is penetratingly formed so that the positive pressure cavity portion and the negative pressure cavity portion are connected to each other, and the second element rail is short-circuited to one or more portions. The negative pressure slider for a hard disk driver according to claim 3, wherein the slider is a negative pressure slider. 6. The negative pressure for the hard disk driver according to claim 3, wherein the first element rail is composed of two parts based on a U-shaped corner of the second element rail. slider. 7. The protrusion formed at the tip of the second element rail on the air discharge side is predetermined in the inner direction of the body so that the separated portions of the tip of the second element rail on the air discharge side face each other. The negative pressure slider for the hard disk driver according to claim 6, wherein the negative pressure slider has a structure in which the length is extended. 8. The negative pressure slider for a hard disk driver according to claim 7, wherein a front end portion of the first element rail on the air inflow side is formed to be inclined at a predetermined angle. 9. A first element rail, which is formed so as to project at a predetermined height on the air inflow side on the body and has at least one portion, and projects at a predetermined height on the body. Is formed as
A two-element rail formed of at least one portion between the first element rails, between a rear end of the first element rail on the air inflow side and a front end of the second element rail on the air inflow side. And a channel for exhausting air for transmitting the inflowing air to the rear of the body, an inner portion of the body of the first element rail, the second element rail, and the channel for exhausting air. A positive pressure cavity, a negative pressure cavity surrounded by a body inner side portion of the second element rail, and a negative pressure cavity adjacent to the negative pressure cavity and formed at the tip of the second element rail on the air discharge side. A hard disk driver, comprising: a protrusion and at least one opening formed through a part of the second element rail so that the positive pressure cavity and the negative pressure cavity are connected to each other. Negative pressure slider for . 10. The second portion not adjacent to the positive pressure cavity portion
10. The negative pressure slider for a hard disk driver according to claim 9, wherein both end surfaces of the element rail are separately formed into at least two step layers. 11. The second element rail is formed in a horizontal U-shape on the body, and the U-shaped corner portion is located between the first element rails. 9
Alternatively, a negative pressure slider for a hard disk driver according to claim 10. 12. The negative pressure slider for a hard disk driver according to claim 11, wherein the first element rail is composed of two parts based on a U-shaped corner of the second element rail. . 13. The negative pressure slider for the hard disk driver according to claim 12, wherein the opening is formed at a corner of the U-shaped second element rail. 14. The protrusion formed at the tip of the second element rail on the air discharge side has a predetermined length in the inner direction of the body so that the separated portions of the tips of the second element rail on the air discharge side face each other. The negative pressure slider for the hard disk driver according to claim 13, wherein the negative pressure slider has a structure in which the length is extended. 15. The negative pressure slider for a hard disk driver according to claim 14, wherein a tip portion of the first element on the air inflow side is formed to be inclined at a predetermined angle.