JPH0737231A - Magnetic head and magnetic disk device - Google Patents

Abstract

PURPOSE:To make a movement smooth by making the generation of a floating force hardly occur while shortening a slider length to a traveling direction and floating a slider with air a little while providing an air bearing plane to the seeking direction when a magnetic head disk device is constituted of a magnetic head slider and a supporting body. CONSTITUTION:A flat part 1a and a taper part 1b are provided in a slider 1 and a magnetic transducer 1c is mounted on the side face of the flat part 1a. The contact state with the face of a recording medium is held by the flat part 1a to the traveling direction of the slider 1a and the slider is floated a little by the flat part 1a and the taper part 1b in the seeking direction. The supporting body 2 is constituted of parallel loading beams 2a, 2b and a spacer 2c, beams 2a, 2b are bent preliminarily and the slider 1 is held between beams at the fixing edge of one side. In such a constitution, the length of the slider 1 is made as short as possible, however, is 4.00mm since it includes an adhesion area for beams 2a, 2b, the air bearing plane is generated by the taper part and the flat part to the seeking direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head slider, a support for the same, a method for manufacturing the same, and a magnetic disk device, and more particularly to a magnetic head slider excellent in high recording density, high reliability and low cost. The present invention relates to a support, a method for manufacturing the support, and a magnetic disk device.

[0002]

2. Description of the Related Art A magnetic head slider used in a conventional magnetic disk device is an application of a conventional air bearing, which is used to reduce the aerodynamic levitation force generated during rotation of a magnetic recording medium and the magnetic head slider. The distance from the surface of the magnetic recording medium is very small so that the predetermined load applied from the supporting body is balanced, and the surface of the magnetic recording medium flies stably while keeping it constant.

On the surface of the recording medium that runs, there are undulations of all wavelengths and amplitudes, from long wavelengths and large amplitude undulations such as runouts to short wavelengths and small amplitude undulations from the slider length to surface roughness. Further, when the magnetic head slider moves in the seek (radial) direction for recording / reproducing in another area of the magnetic recording medium, a moment in the rolling (lateral) direction acts on the slider. Therefore, the slider has three degrees of freedom in the vertical direction, pitching (front-back) direction, and rolling (lateral) direction so that the slider can follow undulations of all wavelengths and amplitudes and is dynamically stable even in the seek direction. It is a slider / support system that exerts a restoring force on the movement of.

In addition, electronic design (El
ectronic Design, 5, March, 1980, 60-
A magnetic transducer for applying a magnetic field or detecting a residual magnetic field, as discussed on page 63), is formed as a thin film element by a lithographic technique on the side of the outflow end of one of the slider rails that can minimize the flying height. There is.

The conventional magnetic head slider support has two outer flexible fingers connected to each other by a stepped low-flexible lateral frame, as described in Japanese Patent Laid-Open No. 55-22296. A gimbal portion that is a flexible body having a rectangular cutout portion that forms a portion and a flexible central tongue portion that extends from the horizontal frame toward the rectangular cutout portion, an elastic portion that supports the gimbal portion, and a load. It has a member that also serves as a beam member for use, and a load projection that is installed between the member for dual use and the central tongue. With these configurations, the balance between the predetermined load applied from the load beam portion via the load projection portion and the aerodynamically generated levitation force is maintained. At the same time, when disturbance or moment acts on the magnetic head slider directly or through an air film, it should not come into contact with the surface of the recording medium.
With the load protrusion as a fulcrum, the slider can be moved in three degrees of freedom: vertical movement, pitching, and rolling.

Recent demands for higher performance of magnetic disk devices include higher recording density and smaller recording media. The requirements for these magnetic head sliders are to minimize the slider size and to reduce the flying height. In particular, when recording and reproducing while keeping the contact state with the recording medium, the gap between the magnetic transducer and the recording medium surface is almost eliminated, and the recording density is dramatically improved.

In order for the magnetic transducer gap portion to maintain stable contact travel on the surface of the recording medium, it is necessary to prevent an air film from being formed between the magnetic transducer gap portion and the recording medium and to reduce the pressing load. Is. Minimizing the pressing load makes it possible to minimize wear due to the frictional force that constantly acts on the contact surface. Further, in order to reduce the load variation caused by following the swell existing on the medium surface while keeping the contact, it is necessary to reduce the rigidity of the support beam portion in the vertical direction. For example,
When the target specifications are a pressing load of 10 mgf and a load fluctuation amount of ± 1 mgf (10%) or less, the maximum amplitude of the conventional recording medium surface waviness is about 10 μm, so the target of the vertical rigidity of the loading beam is 0.1 gf / mm or less. Also, when the slider fluctuates in pitching due to the moment in the pitching direction due to frictional force and moves in the seek direction,
Since rolling fluctuations are added and intermittent contact occurs, it is necessary to increase the rigidity of the load beam portion in the pitching and rolling directions.

When the conventional levitation support is used for contact traveling, the load of the conventional support is designed to be about 10 gf, so that the beam part for loading is designed to be as long as possible and thin. At the same time, the rigidity against pitching and rolling is also reduced.

The method of recording and reproducing while running in contact, which is described in the Preliminary Lecture of the National Conference of the Institute of Electronics, Information and Communication Engineers, Autumn Meeting, SC-5-1, 5-268, is a main magnetic pole excitation type single magnetic pole. The head is attached to the tip of the movable part that slides up and down, and the tip of the movable part is pushed and supported by its own weight or a spring. Although it is completely rigid in the pitching and rolling directions, the pressing load is as large as 1.8 gf, so the amount of wear on the recording medium surface and slider surface cannot be ignored. This method guarantees MTBF of 500,000 hours. May not be applicable to device.

IE Transactions on Magnetics (IEEETrans.MAG.), M
The above-mentioned method described on page 4921 of AG-27,6 (1991) is a method of contact-traveling an ultra-compact head in which a magnetic transducer, slider, load beam and lead wire are integrated on an unlubricated recording medium surface. Is. With this method, the amount of wear of the recording medium and slider can be reduced because of the ultra-light load (1 mgf or less), but since the rigidity of the load beam in the rolling direction is small, the slider fluctuates or becomes excessive if the seek is performed at high speed. A frictional force acts and the surface of the recording medium is damaged, which causes a problem that reliability of the magnetic disk device deteriorates. In addition, the manufacturing process is complicated and costly because it is manufactured by applying micromechatronics and lithography technology.

[0011]

In the above-described conventional magnetic head slider of the system for recording / reproducing while traveling in contact, and its support, the amount of wear on the surface of the recording medium and the surface of the slider is minimized, and high speed rotation and high speed seek are performed. However, it is difficult to maintain a stable contact state, and the manufacturing process is complicated and costly.

An object of the present invention is to reduce the amount of wear of the recording medium surface and the slider surface in a magnetic head slider and its support for recording / reproducing while traveling in contact, and to perform magnetic rotation while performing high speed rotation / high speed seek. The gap portion is to maintain a stable contact state on the surface of the recording medium.

Another object of the present invention is to provide a manufacturing method for manufacturing a magnetic head slider of a system of recording / reproducing while traveling in contact and a supporting body thereof easily and at low cost.

[0014]

A slider surface which is unlikely to become an air bearing surface in the running direction and which can become an air bearing surface at the time of seek, for example, in a magnetic head slider, the length in the seek direction is shorter than that in the running direction. The problem can be solved by providing a flat portion and a tapered portion on the long slider surface. Further, in the support of the magnetic head slider, it is possible to propose excellent high-speed seek performance by increasing the rigidity in the pitching direction as compared with the rigidity in the vertical direction, preferably 100 times or more. This performance can be easily realized by stacking two load beam portions in parallel and by sandwiching and adhering the magnetic head slider to the end portion between the two load beam portions to form a fixed end. Reliability can be improved by filling a solid lubricant or a liquid lubricant between the load beam portions.
By using this slider and the slider support, it is possible to provide a magnetic disk device excellent in high-speed rotation and high-speed seekability.

[0015]

Since the slider length is short with respect to the running direction, the levitation force is unlikely to be generated, and the recording medium surface can always be contacted. In the seek direction, the air bearing surface is formed by the taper portion and the flat portion, so that the air is slightly floated and can be moved smoothly.

When two ends of the beam portion for loading are fixed in parallel and one end of both ends is fixed and a load is applied to the other end, tensile / compressive stress acts in the longitudinal direction, and when a moment is applied, in the thickness direction. Bending stress acts on. Since the amount of bending due to bending stress is larger than the tensile / compressive stress, the rigidity of the loading beam portion in the pitching direction is larger than that in the vertical direction. Therefore, the load beam portion bends so that one fixed end and the slider surface are always parallel to each other, and the recording / reproducing element portion stably contacts with the medium surface, so that excellent recording / reproducing characteristics are stabilized. Can be obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 shows a magnetic head slider and its support according to an embodiment of the present invention. The magnetic head slider 1 is provided with a flat portion 1a and a taper portion 1b, and a magnetic transducer 1c is mounted on the side surface of the flat portion 1a. The slider 1 keeps contact with the surface of the recording medium at the flat portion 1a in the traveling direction, and the flat portion 1a and the taper portion 1 in the seek direction.
Slightly levitate with b.

The support 2 of the magnetic head slider is composed of two parallel load beam portions 2a and 2b and a spacer 2c. In order to keep the load applied,
The load beam portions 2a and 2b are preliminarily bent, and the slider 1 is sandwiched at one fixed end.

The rigidity K (gf / mm) in the vertical direction and the rigidity K _m (gf / mm) in the pitching direction of the two load beam portions that are stacked in parallel are shown in the following equations.

[0020]

[Equation 1]

However, the length of the slider 1 is c (mm), and the length and thickness of one load beam portion are L (mm), respectively.
h (mm), slider 1 side of beam section for load, spacer 2
The fixed end widths on the c side are b ₁ (mm) and b ₂ (mm), the distance between the load beam portions 2a and 2b is a (mm), and the longitudinal elastic modulus of the material of the support 2 is E (gf / mm). ² ) The design guideline for the support of the magnetic head slider of the embodiment of the present invention will be shown below.

The magnetic head slider support of the embodiment of the present invention can be easily machined so as to be mounted on a hard disk device (HDD) of 3.5 inch to 2.5 inch, 1.8 inch type. From the standpoint of processing accuracy, the design is as compact as possible. Distance a between the load beam portions 2a and 2b
The ratio K / K _m in the pitching direction of the rigidity against vertical direction is increased is increased. However, the distance between the disks of the conventional device in which several disks are mounted is about 3.
The distance a was set to 1.0 mm in consideration of mounting an up-type head and a down-type head on it. The length c of the slider 1 is desired to be as small as possible in order to make the entire support compact, but the load beam portion 2
Since it includes the adhesive surface with a and 2b, it was set to 4.0 mm.

The fixed end width b ₂ of the load beam portion on the side of the spacer 2c is set to 4.0 mm, which is about the same as that of the support mounted in the conventional apparatus. The fixed end width b ₁ on the side of the spacer 2c needs to be long to some extent so that the magnetic transducer 1c can be mounted and an air film is formed at the time of seek, but if it becomes long, the torsional rigidity increases and the slider at the time of seek Since it becomes difficult to move, we chose 2.0-3.0 mm.

When the length L of the load beam portion is increased, the vertical rigidity K is reduced, but the natural frequency of the load beam portion is reduced, and the floating stability is deteriorated. Further, if the thickness h of the load beam portion becomes thin, the vertical rigidity K becomes small, but if it is too thin, durability will be a problem. Therefore, the thickness h of one load beam part should be 0.01 mm or more and 0.04 mm.
As the following design range, use the formula 1 in which the design specifications are such that the pressing load is 10 mgf or less, the load fluctuation amount is within ± 1 mgf (10%), and the vertical rigidity K of the loading beam part is 0.1 gf / mm or less. Table 1 shows the result of the calculation. However,
The material of the support 2 was the same stainless steel as that used in the conventional support for stable levitation.

[0025]

[Table 1]

From Table 1, the thickness h of one load beam portion is shown.
When the design range is 0.01 mm or more and 0.04 mm or less, the length L of the beam portion for loading is 10.0 mm or more and 38.0 mm or less. Since the length of the load beam portion mounted on the above-mentioned conventional device is about 20.0 mm, the support body of the magnetic head slider of the embodiment of the present invention can be mounted on the above-mentioned conventional device.

By producing a support having the shape and dimensions shown in Table 1, the vertical rigidity of the load beam portion is 0.1 g.
The rigidity in the pitching direction has been increased by a factor of 100 or more compared to the vertical direction at f / mm.

(Embodiment 2) FIG. 2 shows a magnetic head slider according to an embodiment of the present invention and its support, a recording medium, a rotary drive system, a head, a seek system, and a recording / reproducing system. An embodiment of the magnetic disk device will be shown.
In the drawing, a plan view and a side view of a state where the head slider of the present invention is running and seeking while in contact with the recording medium 3 are shown. The load applied to the recording medium 3 by the support 2 is adjusted by the mounting height H of the support reference surface 4 and the recording medium 3. The mounting height H is the initial deflection due to the deflection due to the pressing load,
Add the height of the flat part. However, since there is a deflection due to its own weight, it is necessary to adjust the initial deflection for the up type and the down type, respectively. With this device, MTBF
I was able to guarantee 500,000 hours.

(Embodiment 3) Wear is inevitable even if the pressing load and frictional force are reduced. If the generated abrasion powder enters between the slider 1 and the recording medium 3, the contact state cannot be maintained.

FIG. 3 shows a magnetic head slider 10 according to another embodiment of the present invention for preventing abrasion dust intrusion. As shown in FIG. 3, the slider surface has a flat portion 10a, a tapered portion 10b, 1
0c, and by making the flat portion 10a pentagonal, even if minute abrasion powder tries to enter from the running direction, it is removed outside from the side surfaces 10d and 10e of the flat portion 10a. Therefore, this structure can improve the sliding resistance by one digit or more. Further, since the minute projections existing on the surface of the recording medium are burnished by the cutting action of the side surfaces 10d and 10e, there is an effect that the surface of the recording medium can be smoothed and a high reproduction output can be obtained.

(Embodiment 4) FIG. 4 shows a method of manufacturing a magnetic head slider and its support according to an embodiment of the present invention.

The slider 1 is manufactured by processing the flat portion 1a and the tapered portion 1b of a block having the magnetic transducer 1c mounted thereon by a conventional machining method. The minimum waviness amplitude existing on the surface of the conventional recording medium 3 is ± 0.
Because about 5 nm, the central line average surface roughness R _a of the flat portion 1a to 0.5nm or less.

Load beam portions 2a and 2b, spacer 2
c is manufactured by conventional machining methods.

The load beam portions 2a and 2b are piled up in parallel, and both ends are sandwiched and bonded by the slider 1 and the spacer 2c.

The two load beam portions 2a and 2b are bent.

FIG. 5 shows the integrated magnetic head slider and its support 5 of the present invention. When the slider and the support are integrally manufactured by conventional electric discharge machining and laser machining, the manufacturing process can be further simplified as compared with the manufacturing method described above.

Further, by filling a solid lubricant such as molybdenum difluide or carbon or another liquid lubricant between the two parallel load beam portions, the friction between the two load beam portions is increased. It was possible to prevent abrasion powder from being generated and smooth the bending vibration of the support.

[0038]

According to the present invention, it is possible to minimize the amount of wear on the recording medium surface and the slider surface, and to maintain a stable contact state while rotating at high speed and seeking at high speed.
It is possible to provide a magnetic head slider, a support therefor, a method of manufacturing the same, and a magnetic disk device which are excellent in high density, high reliability, and low cost by a method of recording and reproducing while traveling in contact.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetic head slider and its support according to an embodiment of the invention.

FIG. 2 is an explanatory diagram showing a state in which a magnetic head slider and its support according to an embodiment of the present invention are in contact with a recording medium and traveling.

FIG. 3 is a perspective view showing a magnetic head slider according to an embodiment of the present invention for preventing abrasion dust intrusion.

FIG. 4 is an explanatory diagram showing a method of manufacturing a magnetic head slider and its support according to an embodiment of the present invention.

FIG. 5 is a perspective view in which the magnetic head slider of the embodiment of the invention and its support are integrated.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magnetic head slider, 1a ... Flat part, 1b ... Tapered part, 1c ... Magnetic transducer, 2 ... Magnetic head slider support body, 2a, 2b ... Loading beam part, 2c
... spacer, 2c ... spacer, c ... length of slider 1,
L ... Length of load beam part, b ₁ Width of fixed end of load beam part on slider 1 side, b ₂ Width of fixed end of load beam part on spacer 2c side, h ... Load beam part 2b , 2b
, A ... Distance between the load beam portions 2b and 2b.

Claims (10)

[Claims] 1. A magnetic recording medium is provided with a magnetic transducer capable of recording or reproducing a signal, and recording / reproduction is performed while traveling or contacting intermittently on the surface of the rotating magnetic recording medium, and another area of the magnetic recording medium. In a magnetic head slider that moves for recording or reproduction, a slider surface that does not easily become an air bearing surface on the magnetic recording medium surface in the traveling direction is provided, and recording or reproduction is performed in another area of the magnetic recording medium. A magnetic head provided with a slider surface which can be an air bearing surface when the magnetic head is moved to move. 2. A magnetic recording medium is provided with a magnetic transducer capable of recording or reproducing a signal, and recording / reproducing is performed while traveling or contacting intermittently on the surface of the rotating magnetic recording medium, and another area of the magnetic recording medium. In a support of a magnetic head slider provided with a load beam portion for applying a load to a magnetic head slider that moves for recording or reproducing, the rigidity in the pitching direction is made extremely larger than the rigidity in the vertical direction. And a magnetic head slider support. 3. A magnetic head slider according to claim 1, wherein a flat portion and a taper portion are provided on a slider surface whose longitudinal direction is the same as a moving direction for recording or reproducing in another area of the magnetic recording medium. . 4. A magnetic head slider support according to claim 2, wherein the rigidity in the pitching direction is 100 times greater than the rigidity in the vertical direction. 5. The magnetic head slider according to claim 2, wherein the two load beam portions are overlapped in parallel, and the magnetic head slider according to claim 1 is sandwiched and bonded to an end portion between the two load beam portions. Support for magnetic head slider as fixed end. 6. The magnetic head slider according to claim 1 and the support for the magnetic head slider according to claim 5, wherein the magnetic head slider and the support for the magnetic head slider are manufactured integrally. A method for manufacturing the support. 7. A magnetic disk device according to claim 1, wherein the magnetic head slider and a support for the magnetic head slider are used. 8. The load beam portion according to claim 3 or 5, wherein the thickness of the load beam portion is 0.01 mm or more and 0.04 mm or less, and the length of the load beam portion is 10.0 mm or more, 38. .
A magnetic head slider of 0 mm or less and its support. 9. The magnetic head slider according to claim 3, wherein the slider surface, which is less likely to become an air bearing surface on the magnetic recording medium surface in the traveling direction, has a pentagonal shape. 10. The magnetic head slider support according to claim 5, wherein a solid lubricant or a liquid lubricant is filled between the two load beam portions.