JPH0896337A - Disk drive device with floating slider and floating slider - Google Patents

Abstract

(57) [Summary] [Purpose] A flying slider that can keep the flying height of the slider constant over the entire data zone in response to any flying conditions (peripheral speed and skew angle) required for drive design. . [Structure] Located on the outer peripheral side of the recording medium 4, facing the recording medium as an air-lubricated surface, and located on the air inflow end portion 70 side,
A first rail 111a having a tapered portion 112 and a second rail positioned on the inner circumference side of the recording medium, having one or more bending points BP, and having a width wider than the width of the first rail 111a. The rail 111b is the second rail 111b, which is located on the air inflow end portion 70 side facing the recording medium as an air lubrication surface and has a taper portion 113, and the slider central axis CL at the air outflow end portion 80. A flying-type slider, comprising: a head element 5 having a protrusion shape provided on the top.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flying slider applied to a disk drive device such as a hard disk system, and a disk drive device equipped with this flying slider.

[0002]

2. Description of the Related Art As a recording medium for, for example, a computer, a disc-shaped recording medium capable of random access, for example, a magnetic disk (hard disk) is widely used. With the recent demand for higher recording density for recording media, for example, in hard disk drive systems (HDD), the zone bit recording method is being adopted. The zone bit recording method is a method of increasing the recording capacity of the entire hard disk by dividing the data area on the hard disk into several zones and recording at a higher frequency in the outer peripheral zone of the hard disk. In order to effectively utilize this zone bit recording method, it is necessary to make the flying height of a slider component carrying a magnetic head (also called a head element) constant over the entire data area of the hard disk.

Further, most of the current recording medium drives adopt the CSS system (contact start / stop system) when the drive is started, and therefore, durability against sliding between the magnetic head and the recording medium (medium). The improvement of the sex is desired. In order to suppress the wear of the magnetic head due to this sliding, it is said that the time during which the magnetic head slides on the recording medium should be shortened. To reduce the sliding time, one of the slider levitation characteristics, "high
"h-pitch" is required. This pitch is the difference between the flying height at the air inflow end and the flying height at the air outflow end. If the pitch is high, it is possible to attach and detach for a short distance, and the sliding time is shortened.

FIG. 11 shows the structure of a taper flat type slider which has been used conventionally. The conventional slider has two air lubricated surfaces ABS (Air Beari).
two rails 11, 1 as ng Surface)
One. The rails 11 and 11 are separated by a groove called an air groove 14, which has a depth of, for example, 20 μm or more. The air groove 14 is usually formed by machining with a grindstone. On the air inflow end 11a side of the air-lubricated surface 11, a very gentle inclination with an angle of 1 degree or less is provided, and this inclination is called a taper portion 12. The generation of the air pressure on the air-lubricated surface 11 is due to the tapered portion 12 to a large extent.

The flying height of a conventional taper flat slider is determined by the velocity of air volume (circumferential velocity) facing the slider and the angle of air flow (skew angle) with respect to the slider central axis. A slider as shown in FIG. 11 is attached to the tip of a swing arm. In a hard disk drive system using this swing arm, the peripheral speed and the skew angle change at each radial position on the hard disk. Since the peripheral speed increases in proportion to the radius on the hard disk, it tends to increase toward the outer peripheral side. On the other hand, the air pressure is generated with the maximum efficiency when the airflow enters the slider from the front (skew angle = 0 degree), and the generation efficiency is reduced as the skew angle is increased. Therefore, the flying height of the slider generally decreases as the skew angle increases or decreases with the skew angle of 0 degree.

FIG. 12 shows the constant flying characteristics of a conventional taper flat slider on a drive. Reference numeral 104a indicates a constant floating characteristic under the most ideal condition of the drive. Reference numeral 104b is a constant levitation characteristic of a drive currently generally used. And reference numeral 10
4c is a constant floating characteristic when the skew angle at the head portion is plus or minus 5 degrees. Generally, the peripheral speed and skew angle range in which the slider is used are determined for drive design reasons. At the same time, the spring load applied by the suspension to the slider is also determined by the drive design.

In the case of the taper flat slider, the main design parameters for the above constraint conditions are shown in FIG.
This is the width of the air-lubricated surface 11. Both the peripheral speed dependence and the skew angle dependence of the flying height are determined by the width of the air-lubricated surface 11 in FIG. With respect to the set value of the flying height, the width of the air-lubricated surface 11 is automatically determined under the above flying conditions, and at the same time, the skew angle dependency of the flying height is also determined. As can be seen from FIG. 12, with respect to the width of a certain air-lubricated surface 11, the conventional taper-flat type can only obtain a constant floating characteristic only within a very limited skew angle range. Good CF under conditions
H characteristics (Constant Flying Height
t, constant floating characteristics) cannot be obtained. The CFH characteristic is to maintain a constant flying height over the entire flying area in the drive.

[0008]

As described above, in the conventional taper flat type slider, the air-lubricated surface 11 is practically used.
It is extremely difficult to improve the constant levitation characteristics, because only the width of γ can be used as the design parameter. Also hig
Even in the case of h-pitch, at the time of HGA (head / gimbal / assembly) assembly, the position of the load point is moved to the rear end of the slider, so that the front end of the slider is easily lifted. However, with such a conventional slider, the current situation is that the possibility of high-pitching cannot be seen from the viewpoint of the limit of the assembly accuracy with the downsizing of the slider chip.

Therefore, the present invention has been made to solve the above-mentioned problems, and the flying height of the slider is set to the data zone in accordance with the arbitrary flying conditions (peripheral speed and skew angle) required in the design of the drive. It is an object of the present invention to provide a flying slider that can be made uniform over the entire area and a disk drive device including the flying slider.

[0010]

According to the first aspect of the present invention, there is provided a flying slider that receives a lift force by an air flow generated by rotation of a recording medium, the flying slider being located on the outer peripheral side of the recording medium. A first rail having a taper portion, located on the air inflow end side facing the recording medium as an air-lubricated surface, and on the inner peripheral side of the recording medium;
A second rail having one or more bending points and having a width wider than that of the first rail, the second rail being located on the air inflow end side facing the recording medium as an air lubrication surface. Then, it is achieved by a flying slider including the second rail having a taper portion and a protruding head element provided on the slider central axis at the air outflow end portion. In the first aspect of the present invention, the width of the second rail is preferably 10 μm greater than the width of the first rail.
Wider than m and 200 μm or less. In the first aspect of the present invention, preferably, the one or more bending points of the second rail have a rail bending angle of 1 with respect to a slider central axis.
It is more than 0 degrees and less than 45 degrees. According to the second aspect of the present invention, there is provided a means for rotating a recording medium, and a flying slider that receives a lift force by an air flow generated by the rotation of the recording medium. A first rail that faces the recording medium as an air-lubricating surface, is located on the air inflow end side and has a tapered portion, and is located on the inner peripheral side of the recording medium. A second rail having one or more bending points and having a width wider than that of the first rail, facing the recording medium as an air lubrication surface, and having an air inflow end portion. The second slider having a taper portion positioned on the side, and a protrusion-shaped head element provided on the slider central axis at the air outflow end portion; Holding the suspension Disk drive device comprising a floating type slider comprising a Pensions, the.

[0011]

According to the above construction, in the first aspect of the invention, the first rail has the tapered portion and the second rail also has the tapered portion. Therefore, when the recording medium rotates, the air-lubricated surface is formed. Can generate air pressure at. Since the second rail is wider than the first rail and has one or more bending points, it is possible to make the flying height constant in the entire flying area and optimize the flying characteristics of the slider. Can be achieved. Since the head element is on the central axis of the slider, the air-lubricated surface A
The influence of the BS shape on the flying height of the slider is small. Therefore, the processing accuracy can be made relatively weak, and the yield in mass production is improved. Since the protruding head element is provided on the slider central axis at the air outflow end, the portion including this head element functions as an air lubrication surface. Therefore, there is an advantage that the head element can be arranged on the slider central axis, and the slider can be downsized. In the first invention, any levitation conditions (peripheral speed and skew angle) required for the drive design
Accordingly, the flying height of the slider can be made constant over the entire data zone. In the first aspect of the present invention, the width of the second rail is 10 μm smaller than the width of the first rail.
If the size is wider than m, the increase in the flying height in the outer zone (OD) of the recording medium cannot be suppressed, and the flying height in the outer zone of the recording medium increases. Therefore, it is not preferable because sufficient CFH characteristics cannot be obtained.
In addition, the width of the second rail is 2 more than the width of the first rail.
If the value is larger than 00 μm, on the contrary, the flying height is significantly reduced in the outer zone of the recording medium, and it is not preferable because good CFH characteristics cannot be obtained. In the first aspect of the present invention, when the bending point of one or more positions of the second rail is an angle at which the rail bending angle is smaller than 10 degrees with respect to the slider central axis, the roll angle is increased in the zone outside the recording medium. And the risk of media crash increases. Further, it is not preferable because the dynamic stability at the time of seek is deteriorated. In addition, at one or more bending points of the second rail,
When the rail bending angle is larger than 45 degrees with respect to the slider central axis, the roll angle takes a large negative value in the outer zone of the recording medium, which is also unfavorable in that dynamic instability also increases. In the second invention, the first rail has the taper portion and the second rail also has the taper portion. Therefore, the rotation of the recording medium by the rotating means generates the air pressure on the air-lubricated surface. . Since the protruding head element is provided on the slider central axis at the air outflow end, the portion including this head element functions as an air lubrication surface. Moreover, the second rail is wider than the first rail and has one or more bending points. Due to the balance between the lift force of the flying slider and the force of the suspension holding the slider toward the recording medium, the slider stably floats above the recording medium. The slider can keep the flying height constant in the entire flying area, and the flying characteristics of the slider can be optimized.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is, unless otherwise stated to limit the present invention, in the following description.
It is not limited to these modes.

FIG. 1 shows a preferred embodiment of a disk device equipped with the floating slider of the present invention. In FIG. 1, a hard disk 4 serving as a rotary magnetic recording medium is rotatable in a rotation direction R by a rotating means 400. The flying slider 1 is arranged to face the hard disk 4 and move in the radial direction of the hard disk. The slider 1 is equipped with a magnetic head 5. The magnetic head 5 can be either a thin film head or a bulk (MIG, Metal in Gap) head. The slider 1 is fixed to the tip of the suspension 2 by adhesion.
For suspension 2, slider 1 to hard disk 4
It is a biasing means for pressing against.

The hard disk 4 is rotated at high speed by the rotating means 400, and at this time, the slider 1
Generates an upward lift force by the air flow generated on the surface of the hard disk 4. The slider 1 stably floats above the hard disk 4 by the balance between the lift force and the downward force of the suspension 2. As a result, the slider 1 can read a signal recorded on the signal recording surface of the hard disk 4 rotating at a high speed or write a signal on the signal recording surface.

The slider 1 and the suspension 2 are bonded to each other and are regarded as one component, which is called HGA (head / gimbal / assembly). This HGA
6 is further attached to the actuator arm 3. The attituator arm 3 is rotated by the rotary actuator 3b about the rotation shaft 3a, so that the magnetic head 5 on the slider 1 moves on the hard disk 4 to record and reproduce a signal at each radial position of the hard disk 4. It can be carried out. Such a head moving method is called a swing arm method. In the swing arm method, as shown in FIG. 2, at each radial position of the hard disk 4, the velocity of the air flow that the slider 1 faces (hereinafter referred to as the peripheral velocity). ), And the angle of the airflow with respect to the slider central axis (hereinafter referred to as the skew angle) changes.

In FIG. 2, three radial positions P1, P2, P
3 schematically shows the state of the slider 1 in 3.
For the slider, a general conventional slider is used as an example. The airflow is indicated by the arrow A. At the radial position P1, the skew angle is smaller than 0 degree. The skew angle is 0 degree at the radial position P2. On the other hand, the skew angle is larger than 0 degree at the radial position P3. This skew angle is indicated by symbol α in FIG.

FIG. 3 shows an example of a preferable structure of the flying slider of the present invention. In FIG. 3, the slider 1
Has a first rail 111a and a second rail 111b, an air groove 114, a head mounting portion 16, and a magnetic head 5 as a head element. First rail 11
1a is also referred to as an outer peripheral side rail, is located corresponding to the outer peripheral side of the hard disk 4 in FIG. 1, functions as an air lubrication surface (ABS), and is located on the air inflow end 70 side. The first rail 111a has an air inflow end portion 70.
It has a taper portion 112 on the side. Second rail 11
1b is also called an inner peripheral side rail, is located on the inner peripheral side of the hard disk 4 (the rotation center side RP of the hard disk 4) with respect to the first rail 111a, and functions as an air lubrication surface (ABS). This second rail 111b
Is located on the air inflow end 70 side and has a tapered portion 113 on the air inflow end 70 side. The second rail 111b is the rotation center axis side of the hard disk 4,
The first rail 111a is located on the outer peripheral side.

Head mounting portion 16 and first rail 111a
An air groove 114 is formed between the second rail 111b and the second rail 111b. The second rail 111b has one bending point BP. The rail bending angle of the bending point BP is preferably set to 10 degrees or more and 45 degrees or less, and the rail bending angle α is preferably set to 10 to 20 degrees. The portion 111c and the portion 111d on the air inflow end portion 70 side are parallel, but the remaining portions 111e and 111f are not parallel. As described above, providing only one bending point BP only on the second rail 111b is because the skew angle dependency of the flying height is shifted by the bending of the inner rail 111b, and the CFH characteristic can be adjusted. Moreover, the effect (shift amount) is greater than the bending of the outer peripheral rail.

The width W of the second rail 111b is set wider than the width W1 of the first rail 111a. In this way, the width W of the second rail 111b is equal to the width of the first rail 11b.
The reason why the width W1 of 1a is set wider is that the difference in rail width causes the skew angle dependence curve of the flying height shown in FIG. 6 to shift to the negative skew angle side, and this shift amount is ΔW.
= W-W1. Therefore, the optimum CFH characteristic can be obtained by selecting an appropriate ΔW for the skew angle range in an arbitrary drive. The width W of the second rail 111b is, for example, 10 μm or more than the width W1 of the first rail 111a.
It is wide in the range of 0 μm or less. Preferably,
The width W of the second rail 111b is the width W1 of the first rail.
It is set wider than 50 to 100 μm.

The head mounting portion 16 of FIG. 3 is preferably formed in a protruding shape or an island shape with respect to the air groove 114. The magnetic head 5 is mounted on the head mounting portion 16. The head mounting portion 16 is located on the air outflow end portion 80 side. Air inflow end 70 and air outflow end 80
Correspond to the inflow end 70 and the outflow end 80 of the airflow A, as shown in FIG. The head mounting portion 16 is preferably located on the same plane as the first rail 111a and the second rail 111b. The surface of the head mounting portion 16 plays the role of an air lubrication surface like the first rail 111a and the second rail 111b. The head mounting portion 16 is located corresponding to the central portion of the slider 1 or the central axis CL.

The first rail 111a and the second rail 11
1b are separated by air grooves 114 with a depth of 10 μm or more, preferably 20 μm.

Next, the operation of the slider shown in FIG. 3 will be described. The difference between the width W of the second rail 111b on the inner circumference side and the width W1 of the first rail 111a on the outer circumference side (hereinafter referred to as the rail width asymmetry amount ΔW), and the bending angle at the bending point BP of the inner circumference rail 11b (hereinafter It is possible to optimize the flying characteristics of the slider by controlling the rail bending angle θ). When the rail width asymmetry amount ΔW is used as a parameter, the skew angle dependency of the flying height of the air outflow end portion 80 of the slider 1 according to the embodiment of the present invention (peripheral speed = constant).
Is shown in FIG.

In FIG. 4, as the rail width asymmetry amount ΔW increases, the positive skew angle side (for example, plus 20 degrees).
It can be seen that the decrease in the flying height increases at. As described above, in the hard disk drive device using the conventional rotary actuator, the peripheral speed and the skew angle increase toward the outer periphery of the hard disk that is the medium. The flying height increases as the peripheral speed increases, and the flying height decreases as the skew angle increases. Unlike the conventional taper flat slider as shown in FIG. 11, the slider 1 shown in FIG. 3 of the present invention adjusts the rail width asymmetry amount ΔW according to the setting of the skew angle range in the hard disk drive. By doing so, it is possible to control the lowering of the flying height at the outer circumference. As a result, the flying height can be made constant in the entire flying area of the slider 1 in FIG.

FIG. 5 shows the skew angle dependence (peripheral speed = constant) of the roll characteristic of the slider 1 when the rail width asymmetry amount ΔW is constant and the rail bending angle θ is used as a parameter. Further, FIG. 6 shows the skew angle dependence (peripheral speed = constant) of the roll characteristic of the slider 1 when the rail bending angle θ is constant and the rail width asymmetry amount ΔW is used as a parameter. The roll angle is an angle formed by the central axis (passing through the center of gravity) of the slider cross section and the horizontal axis.

In FIG. 6, when the rail width asymmetry amount ΔW is increased, the roll angle of the slider 1 shifts to the positive side, but the rate of change itself with respect to the skew angle is almost constant. However, as shown in FIG. 5, when the rail bending angle θ is increased, the rate of change of the roll angle with respect to the skew angle becomes dull. Therefore, the slider 1 can obtain a substantially constant roll angle throughout the entire flying area, and the minimum flying height of the slider 1 can be prevented from becoming smaller than an allowable value. Further, an extremely large roll angle causes dynamic instability of the flying height due to acceleration during head seek. Therefore, by optimizing the flying height described above, the dynamic characteristics of the flying height can be improved.

Further, the slider 1 of the present invention is high
-It is also effective for making a pitch. That is, as illustrated in FIG. 3, the first rail 1 also called a side rail.
11a, the length of the second rail 111b is relatively short,
The rail width at the air inflow end portion 70 can be widened. Therefore, since a large positive pressure is generated in the front part of the slider 1, the slider 1 floats up in the front part, resulting in a large pitch (PITCH).

7 and 8 show a preferred embodiment of the slider of the present invention. Slider 1 in FIGS. 7 and 8
Can be manufactured, for example, as follows. First, a urethane-based resist material is applied to the entire surface of the slider chip made of Altic material, only the first rail 111a, the second rail 111b, and the head mounting portion 16 are masked, and photocured by ultraviolet rays. Is. After the urethane-based resist material is cured, the uncured portion is removed with a developing solution to form a resist mask M on the surface of the slider 1 at the above-mentioned necessary locations as shown in FIG. As shown in FIG. 10, the AlTiC material on the surface of the slider chip 1 is formed by a powder beam etching (PBE) method in which fine ceramics abrasive grains 500 are jetted from a jet nozzle 600 by a carrier gas (air, nitrogen gas) to be processed. Remove and remove air groove 1
14 is formed. The air groove 114 can be formed by a reactive ion etching (RIE) method or an ion milling method. The slider chip 1 thus manufactured is adhered onto the suspension 2 shown in FIG. 1 to form an HGA (head / gimbal /
Assembly 6 is formed.

FIG. 9 shows the flying characteristics of the slider 1 when the slider 1 of the present invention is applied to a 2.5 inch hard disk drive system. It can be seen that as the rail width asymmetry amount ΔW increases to 0, 50, and 100 μm, the flying height on the outer periphery of the hard disk 4 decreases. In this skew angle range, ΔW = 50
The best constant floating characteristic of the slider 1 is obtained when the thickness is μm.

An embodiment of the slider 1 shown in FIGS. 7 and 8 will be described. In the slider 1 of FIG. 7, the first rail 1
The width W1 of 11a is 350 μm, for example. The width W of the second rail 111b is, for example, 400 μm. Second
The rail bending angle θ of the rail 111b is 10 degrees, for example. The width W2 of the head mounting portion 16 with respect to the central axis C is 400 μm, for example. In the embodiment shown in FIG. 7, one bending point BP is formed on the second rail 111b.

On the other hand, in the embodiment of the slider 1 shown in FIG. 8, two bending points BP1 and BP2 are formed on the second rail 111b. The rail bending angle θ1 at the bending point BP1 is, for example, 5 degrees, and the bending angle θ2 at the bending point BP2.
Is, for example, 8 degrees. One or more bending points BP are formed on the guide rail on the inner peripheral side of the rotation center RP of the hard disk 4 in FIG. This makes slider 1
The optimum constant floating characteristics and roll characteristics can be obtained.

In the above-described embodiment, the flying height of the slider can be made constant over the entire data zone of the hard disk in accordance with the optional flying conditions (peripheral speed, skew angle) required for designing the hard disk drive. Especially 2
When the gap type MR / IND thin film head is used, it is expected that the range of the skew angle of the slider will be changed within a narrow range of about ± 5 degrees around 0 degree in the future. In the embodiment, it is possible to achieve a constant flying height even within the range of the skew angle described above. Since the roll angle of the slider when flying can be minimized, it is possible to reduce the dynamic instability of the flying height of the slider due to the acceleration when the magnetic head seeks.

An air-lubricated surface (A
By increasing the (BS) area, high-pitching is possible. As a result, the slider takes off and land at a lower speed, so that the sliding time is shortened and the durability of the slider in the contact start / stop system (CSS system) can be improved. At the same time, since the followability of the flying characteristics of the slider to disturbance is improved, the reliability during drive operation is improved. Since the head element, which is also called a magnetic head, is located on the central axis of the slider, the influence of the shape of the air-lubricated surface (ABS) on the flying height of the slider is small. Therefore, the processing accuracy can be made relatively weak and the yield in mass production can be improved. The present invention is not limited to the above embodiment. In the illustrated embodiment, a hard disk is described as an example of the recording medium, but the present invention is not limited to this, and the present invention may be applied to a floppy disk. The present invention can be applied to, for example, an information recording / reproducing apparatus for data storage. Further, although one or two bending points are described in the illustrated embodiment, the second rail is not limited to this, and three or more bending points may be provided.

[0033]

As described above, according to the present invention, the flying height of the slider is made constant over the entire data zone in accordance with the optional flying conditions (peripheral speed and skew angle) required for the drive design. can do.

[Brief description of drawings]

FIG. 1 is a diagram showing a hard disk drive device including a floating slider of the present invention.

FIG. 2 is a diagram showing a skew angle of the slider of FIG.

FIG. 3 is a perspective view showing a preferred embodiment of the slider of the present invention.

FIG. 4 is a diagram showing a flying height change amount with respect to a skew angle when a rail width asymmetry amount ΔW is used as a parameter.

FIG. 5 is a diagram showing skew angle dependence (peripheral speed = constant) of roll characteristics of the slider of the present invention when the rail bending angle θ is used as a parameter.

FIG. 6 is a diagram showing skew angle dependence (peripheral speed = constant) of roll characteristics of the slider of the present invention when the rail width asymmetry amount ΔW is used as a parameter.

FIG. 7 is a diagram showing a preferred embodiment of the slider of the present invention.

FIG. 8 is a diagram showing another preferred embodiment of the slider of the present invention.

FIG. 9 is a diagram showing the flying characteristics of a slider when the slider of the present invention is applied to a 2.5-inch hard disk drive.

FIG. 10 is a view showing an operation of forming an air groove by removing the AlTiC material on the slider surface by a powder beam etching (PBE) method.

FIG. 11 is a diagram showing an example of a conventional slider.

FIG. 12 is a diagram showing constant floating characteristics of a conventional taper flat slider hard disk drive.

[Explanation of symbols]

 4 hard disk (recording medium) 5 magnetic head (head element) 16 head mounting portion 70 air inflow end portion 80 air outflow end portion 111a first rail (outer rail) 111b second rail (inner rail) 112, 113 Tapered portion 114 Air groove BP Bending point of second rail W Width of second rail W1 Width of first rail CL Center line of slider

Claims (4)

[Claims] 1. A flying slider that receives a lift force by an air flow generated by the rotation of a recording medium, the flying slider being located on the outer peripheral side of the recording medium and facing the recording medium as an air lubrication surface toward the air inflow end side. A first rail having a tapered portion, an inner circumferential side of the recording medium, one or more bending points, and a width wider than the width of the first rail. A second rail, which is located on the air inflow end side facing the recording medium as an air lubrication surface and has a taper portion; and an air outflow end portion provided on the slider central axis. And a protrusion-shaped head element formed as described above. 2. The flying slider according to claim 1, wherein the width of the second rail is wider than the width of the first rail by 10 μm or more and 200 μm or less. 3. The one or more bending points of the second rail have a rail bending angle of 1 with respect to the slider central axis.
The levitation slider according to claim 1, wherein the levitation slider is from 0 degrees to 45 degrees. 4. A unit for rotating a recording medium, and a floating slider that receives a lift force by an air flow generated by the rotation of the recording medium, the slider being located on the outer peripheral side of the recording medium and serving as an air-lubricated surface. A first rail facing the medium, the first rail being located on the air inflow end side and having a taper portion, and the inner rail of the recording medium, and one or more bending points A second rail having a width wider than that of the first rail, the air bearing surface facing the recording medium, being located on the air inflow end side, and being a tapered portion. And a suspension for holding the floating slider, the second rail having the second rail, and a protrusion-shaped head element provided on the slider central axis at the air outflow end. Disk drive device comprising a floating type slider, wherein Rukoto.