JP3569757B2 - Magnetic head slider and magnetic disk drive - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a magnetic head slider and a magnetic disk drive, and more particularly to a magnetic head slider excellent in high recording density and high reliability, a support thereof, a manufacturing method thereof, and a magnetic disk drive.
[0002]
[Prior art]
The magnetic head slider used in the conventional magnetic disk drive is based on the conventional dynamic pressure gas bearing theory, and has two slider rail surfaces and a taper which can be an air bearing surface on a rotating magnetic recording medium surface. The distance from the recording medium surface is kept small and constant so that the floating force generated aerodynamically and the predetermined load applied from the support supporting the magnetic head slider are balanced. It is stably rising.
[0003]
On the surface of a running recording medium, there are undulations of all wavelengths and amplitudes, from long wavelengths and large undulations such as runout, to short wavelengths and small amplitude undulations from the slider length to the surface roughness. Further, when the slider moves in the seek (radius) direction in order to perform recording and reproduction on another area of the recording medium, a rolling moment acts on the slider. Therefore, the slider has three freedom modes of parallel (up and down), pitching (back and forth), and rolling (seek) modes so that the slider can follow the undulations of all wavelengths and amplitudes and can be dynamically stabilized in the seek direction. It is a slider and support system that exerts a restoring force against a degree of movement.
[0004]
Further, conventional electromagnetic induction type thin film heads, which are magnetic transducers for applying a magnetic field or detecting a residual magnetic field, as discussed in Electronic Design, 5, March, 1, 1980, pp. 60-63, are minimal. A thin film element is formed by lithography on the outflow end side surface of one of the slider rails that can have a large flying height.
[0005]
As described in Japanese Patent Application Laid-Open No. 55-22296, a support for a conventional magnetic head slider has two outer flexible fingers connected to each other by a stepped low-flexibility horizontal frame. A gimbal portion which is a flexible body having a rectangular notch portion, a flexible central tongue portion extending from the horizontal frame to the rectangular notch portion, and an elastic portion supporting the gimbal portion and a load. And a load projection provided between the dual-purpose member and the central tongue-shaped portion. It is composed of such a load beam, gimbal, and load protrusion, and maintains the balance between the load applied from the load beam via the load protrusion and the levitation force, and at the same time, dynamically In order to allow the slider to float stably, the slider can be moved in three degrees of freedom in parallel, pitching and rolling modes with the load projection as a fulcrum.
[0006]
In recent years, the size of magnetic disk drives has shifted from high-priced large models to high-performance medium-sized and small-sized machines for price, and the downsizing has progressed. ing. For example, when the diameter of a disk is reduced, a conventional electromagnetic induction type thin film head cannot obtain a sufficient reproduction output because of a low peripheral speed. Therefore, a conventional magnetoresistive head (MR head) whose reproduction output is not related to the peripheral speed has been put to practical use.
[0007]
Demands for high reliability and extremely small flying height for the head-disk interface of the magnetic disk drive are becoming more and more strict, and a contact recording method has been proposed in response to this demand. Contact recording is a method of recording / reproducing while stably sliding the recording medium surface. The magnetic recording-based spacing loss between the magnetic transducer and the recording medium surface can be reduced, and the recording density is dramatically improved.
[0008]
The contact recording method is different from the levitation recording method of the prior art that applied the dynamic pressure gas bearing theory, in which the slider is pressed with the extremely small load transmitted from the load beam part, and the contact surface with the magnetic transducer gap part is recorded. The tips of a number of minute projections on the medium surface are slightly elastically and plastically deformed, and recording / reproduction is performed while maintaining the state. When this contact mechanism is viewed as a vibration system, it can be modeled by a non-linear spring (no hysteresis). This is because the greater the amount of elastic deformation, the greater the number of microprojections in contact, and the greater the restoring force. In addition, the spring coefficient is extremely higher than the air film rigidity, and the amount of elastic deformation is extremely small under an extremely small pressing load, so that the allowable dynamic displacement is also extremely small. Further, a liquid lubricant is applied to the surface of the recording medium to reduce the coefficient of friction and improve the anti-sliding characteristics, so that the contact mechanism is more complicated.
[0009]
There are the following problems when the contact recording method is put into practical use.
(1) In order to maintain a stable contact state, it is necessary to follow at least one portion of the contact surface while contacting a minute undulation existing on the recording medium surface. However, since the slider is constantly subjected to external forces of contact force (perpendicular) and frictional force (in-plane) and their moments, the slider flies away from the recording medium surface due to parallel and pitching vibrations. Furthermore, when contacted again the medium surface and intermittent, transient spacing variations between the magnetic transducer gap portion and the magnetic film surface △ h _m increases, the reproduction waveform is varied. This is the reason why it is difficult to maintain contact with the undulation of solids in the contact recording system.
[0010]
Further, even in a seek operation for moving the contact slider to the target track, a frictional force always acts in the seek direction, and when positioning the magnetic transducer gap portion on the target track, there are vibrations such as rolling vibration and stick-slip. This causes instability in the servo system and reduces the realization of a high track recording density.
[0011]
In the case of the levitation recording method, the air film has a built-in viscous damping, and good tracking characteristics are possible. In order to reduce the transient spacing fluctuation, it is necessary to disperse the vibration energy in the parallel, pitching and rolling modes by combining the elastic element and the damping element as in the levitation recording method even in the contact recording method. .
[0012]
(2) during operation, the contact force and frictional force acting at all times, by the intermittent contact of said transient spacing variation △ h _m, acts excessive contact force and frictional force, the contact surfaces of the contact portion and the medium surface However, there arises a problem that the reliability of the magnetic disk drive is deteriorated due to steady and transient wear.
[0013]
In order to solve the above problems, it is necessary to reduce the contact force and the frictional force. Since the contact force depends on the equivalent mass of the slider movable portion, the moment of inertia, ie, the shape of the slider and the pressing load, it is necessary to minimize them so that wear can be ignored. It is necessary to reduce the area of the contact part so that it does not easily become an air bearing surface, and to minimize the length in the traveling direction to improve the swelling follow-up characteristics. Be shorter.
[0014]
One contact slider of the above-mentioned type described in Japanese Patent Application Laid-Open No. 6-60329 is a short leg portion having a pedestal that can be cut out of a single slider rail from a conventional small-sized flying recording type slider and can be an air bearing surface. Into a substantially L-shaped slider (1.016 × 0.508 × 0.2794 mm). A wear pad that can be a contact surface is formed on a pedestal, and has a structure surrounding a magnetic pole tip and a gap portion of a magnetic transducer.
[0015]
The contact slider of the other type described in JP-A-6-60329 and the contact slider of the above-described type described in JP-A-6-150283 have a small size of a conventional flying recording type slider. One contact surface is provided at the end by two rail surfaces that can be an air bearing surface, and at the outflow end, it is difficult to become an air bearing surface having a magnetic transducer.
[0016]
However, the design and wiring technique of such a microminiature light-load contact slider incorporated in the gimbal portion and a support beam that allows three degrees of freedom of movement and a load beam portion for applying a load become a problem.
[0017]
The load beam section of the recording method reduces the rigidity of the parallel mode in order to reduce the variation in the pressing load due to the long-wave undulation. Further, in order to maintain a stable contact state, it is necessary to always make the contact portion contact parallel to the medium surface, to increase the rigidity in the pitching and rolling modes, and to suppress the pitching and rolling fluctuations.
[0018]
The support of Type 1650 manufactured by Hutchinson Technology, which is currently commercially available, has a load beam portion and a gimbal portion integrally formed of the same member, and the gimbal portion is connected to the load beam portion with both ends, and the load is applied to the slider. Is eliminated, slippage of the load projection due to seek operation is eliminated, and displacement of the slider is prevented.
[0019]
The support described in the 71st Ordinary General Meeting of the Japan Society of Mechanical Engineers (IV) 1994, p. 689-691, has a load beam part and a gimbal part integrally formed, and a signal is directly applied on the load beam part. A line pattern was formed and the leads were eliminated.
[0020]
In the case where the above-mentioned conventional levitation recording type support is used for the recording method, the pressing load is designed to be about several gf, and in order to reduce the rigidity in the parallel mode, the length of the load beam portion is increased. It is designed to be as thin as possible, but at the same time the rigidity against pitching and rolling is reduced.
[0021]
The method described in Japanese Patent Application Laid-Open No. 3-178017 discloses an ultra-compact, light-weight contact slider in which a magnetic transducer, a slider, a load beam section, and wiring are integrally formed on a non-lubricated recording medium surface. This is a method of perpendicular magnetic recording by contact running. In this method, the amount of wear can be reduced because the load is very light (1 mgf or less). However, since the rigidity of the load beam in the pitching / rolling mode is extremely small, the contact portion is parallel to the medium surface and excellent. Is difficult to contact.
[0022]
The method described in the above-mentioned Japanese Patent Application Laid-Open No. 6-60352 can be used as a load beam section of an ultra-small and light-weight contact slider in which a magnetic transducer, a slider, a load beam section, and wiring are integrally formed. A strain gauge is attached to the flexible body, the pressing load is always detected, and control is performed so that a good contact sliding state can be achieved with an optimum pressing force. However, the entire disk device and the manufacturing process become complicated and costly.
[0023]
In the conventional levitation recording type support described in JP-A-59-180855, a braking element is brought into close contact with the surface of a load beam portion and held by a restraining member. A suitable material for the braking element is a modified acrylic polymer material (viscoelastic material). With this structure, seek, torsion, and bending mode vibration due to shear energy absorption braking in the braking element is reduced.
[0024]
[Problems to be solved by the invention]
In the above-mentioned conventional contact recording type magnetic head slider and its support, unstable vibrations (fluttering) increase when flying away from the recording medium surface and making intermittent contact with the medium surface again, but there is a damping element for dissipating the vibration energy. Without it, it was difficult to reduce transient spacing fluctuations.
[0025]
An object of the present invention is to provide a contact recording type magnetic head slider and its support, in which a magnetic transducer gap portion maintains a stable contact state on a recording medium surface, and a transient state after jumping away from the recording medium surface. The purpose is to reduce spacing variations.
[0026]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a method in which a magnetic transducer (magnetic head) is mounted and a contact slider provided with a contact surface that runs in contact with a medium surface and a flexible member that can be a load beam portion. The problem can be solved by connecting with a fiber-reinforced composite material. Furthermore, two fiber-reinforced composite materials having anisotropy are laminated so that the orientation of the fibers intersects at 90 degrees. Further, a flexible body that can be a load beam portion is made of a fiber-reinforced composite material.
[0027]
[Action]
According to the above configuration, the matrix material contained in the fiber-reinforced composite material functions as a vibration suppressing member (damper). Further, by utilizing the anisotropy of the fiber-reinforced composite material, the vibration due to the frictional force in the specific directional contact force (vertical), running direction and seek direction is reduced. By controlling the content and curing conditions of the matrix resin and rubber, an optimal damper effect can be obtained. Further, rubber has hysteresis, and vibration energy is dissipated by the vibration of each expansion and contraction.
[0028]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First Embodiment A first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a magnetic head slider and its support according to a first embodiment.
[0029]
The magnetic head slider 1 has a structure in which a contact portion 1a is provided and the surface thereof is brought into contact with a recording medium to travel. A magnetic transducer 1b, a connection terminal 1d, and a gap 1c are provided on the side surface of the slider 1 and the contact portion 1a, respectively. The support 2 of the slider 1 is composed of only a load beam portion without a gimbal portion, and is attached to a support arm (not shown) of the head positioning mechanism in a cantilever shape at the other end.
[0030]
In this embodiment, the slider 1 and its support 2 are connected by a fiber-reinforced composite material 3. Fiber reinforced composite material is a matrix material made of epoxy resin, rubber, etc., and reinforced with glass, carbon, boron or other inorganic fiber, or aramid organic fiber, and the fiber direction can be freely oriented. Can create anisotropy.
[0031]
The fiber-reinforced composite material 3 has a structure in which two continuous fiber composite materials 3a and 3b having anisotropy are laminated such that the orientation of the fibers intersects at 90 degrees. A signal lead pattern (not shown) was formed on the back surface of the load beam portion (support 2) by etching or the like, and the signal lead pattern was connected to the connection terminal 1d to enable wiring. The materials of the slider 1 and the support 2 were ceramic materials such as alumina titanium carbide and stainless steel, respectively, similarly to the materials used for the conventional flying recording support.
[0032]
FIG. 2 is a diagram illustrating the operation of the magnetic head slider and its support according to the first embodiment of the present invention. When vertical vibration due to contact force (vertical) or seek vibration due to frictional force (in-plane) in the seek direction acts on the contact portion 1a, as shown in the figure, the continuous fiber composite materials 3a and 3b Due to anisotropy, only shear vibration occurs, and does not vibrate in the thickness direction. The matrix material such as resin or rubber acts as a damper, the shear vibration energy thereof is dissipated, and specific vertical vibration and seek vibration are reduced.
[0033]
FIG. 3 shows a magnetic head slider and its support according to a second embodiment of the present invention. As shown in the figure, a slider 4 having a contact portion 4a is provided between continuous fiber composite materials 3a and 3b in order to improve the sliding resistance and wear resistance of the slider 1. Since the continuous fiber composite material 3b does not vibrate up and down, even when the sliders 1 and 4 vibrate independently, they are on the same plane as the contact portions 1a and 4a, and the two 1a and 4a can be stably contacted. Further, the material of the slider 4 does not need to be the same as that of the slider 1, and can be selected independently. Therefore, a ceramic material such as alumina or zirconia having sliding resistance can be selected.
[0034]
FIG. 4 shows a magnetic head slider and its support according to a third embodiment of the present invention. The slider 5 is L-shaped, and when a frictional force (in-plane) in the running direction and in the seek direction acts on the contact portion 5a of the slider 5, the continuous fiber composite materials 6a and 6b shown in FIG. Vibration in the running direction (stick slip) and seek vibration are reduced.
[0035]
FIG. 5 shows a magnetic head slider and its support according to a fourth embodiment of the present invention. As shown in the figure, when a support 7 made of a fiber-reinforced composite material is used as a flexible member that can be a load beam portion, bending and torsional vibration (surface) caused by moments of contact force and frictional force are used. Outside) can be reduced. Further, the support 7 and the continuous fiber composite material 3a can be manufactured integrally, and the manufacturing process can be simplified.
[0036]
FIG. 6 shows a fifth embodiment of the present invention in which the magnetic head slider of the first embodiment is mounted on a support 8 of a contact recording type magnetic head slider. According to this embodiment, it is easy to bring the contact portion 1a into parallel contact with the surface of the magnetic recording medium.
[0037]
In other words, this is an example in which two load beam portions are superposed in parallel, and a contact slider is sandwiched and adhered to an end between the two load beam portions to form a fixed end. Thereby, the stiffness in the pitching mode becomes extremely larger than the stiffness in the parallel mode, and it is easy to make the contact portion contact in parallel with the medium surface. In addition, a flat part and a tapered part are provided in the contact part where the seek direction is longer than the running direction, so that it becomes an air bearing surface during seek operation, so that the air floats slightly and enables smooth seek movement. be able to.
[0038]
FIG. 7 shows, as Embodiment 6 of the present invention, an embodiment in which the magnetic head sliders of Embodiments 2 and 3 are mounted on a conventional floating recording type support 9 of Type 1650 manufactured by Hutchinson Technology. The continuous fiber composite materials 6a and 6b shown in the figure have reduced running vibration (stick slip) and seek vibration in the sliders 10, 11 and 12, respectively, and the slider 12 provided between the slider 11 and the continuous fiber composite material 3b has The sliders 11 and 12 can make stable contact, and can improve sliding resistance and wear resistance. According to this embodiment, the magnetic head slider of the present invention can be mounted on a conventional flying recording type support.
[0039]
FIG. 8 shows an embodiment of a magnetic disk drive according to the present invention as Embodiment 7 of the present invention. 8A is a plan view, and FIG. 8B is a side view. The magnetic disk drive includes a magnetic recording medium 20, a driving unit 21 for rotating the magnetic recording medium 20, a magnetic head slider 1 and its support 2 of the above-described embodiment of the present invention, a support arm 22 for positioning, a driving unit 23 for the positioning arm, and a slider. 1 comprises a circuit 24 for processing a recording / reproducing signal of a magnetic transducer mounted on the apparatus. Further, FIG. 1 shows a plan view and a side view of a state in which the slider 1 is running and seeking in a state of being in contact with the magnetic recording medium 20. The pressing load applied to the support 2 is adjusted by the mounting angle θ between the support 2 and the mounting reference plane 25.
[0040]
9 and 10 show a method of manufacturing the magnetic head slider of Example 1 and a support thereof according to Example 8 of the present invention.
(1) As shown in FIG. 9, the fiber 30 is passed through a roller 33 through a container 32 containing a matrix material such as a thermosetting resin and a liquid rubber and a solvent 31 (for example, cellosolve acetate). Adhere resin around. The adhering amount is appropriately adjusted by a matrix material adjusting device 34 and wound around two pins 35 with a constant torque. In order to form a plate, the guide plate 36 is sandwiched from both sides. The number of turns and the number of layers are determined by the shape and fiber diameter of the fiber-reinforced composite material to be produced. For example, the diameter of carbon fiber is 5 to 20 μm, that of glass fiber is 8 to 12 μm, and that of alumina fiber is 3 to 20 μm.
[0041]
(2) Next, after removing the solvent from the member manufactured in the previous step by natural drying, both ends are removed to manufacture a continuous fiber composite material.
(3) The continuous fiber composite material produced in the previous step is semi-cured in a heating furnace while being pressed at a constant pressure by a pair of presses having a surface with good surface roughness. The curing condition is preferably 200 ° C. and the holding time is preferably about 2 hours.
[0042]
(4) As shown in FIG. 10, two continuous anisotropic continuous fiber composite materials 37 and 38 produced in the previous step are laminated so that their fiber orientations intersect at 90 degrees. The resin is cured in a heating furnace while being pressed at a constant pressure by a pair of presses 39 having a rough surface. In this step, the curing of the continuous fiber composite materials 37 and 38 is completed at the same time.
[0043]
(5) Next, the continuous fiber composite material produced in the previous step is cut into a predetermined shape by conventional mechanical processing such as laser processing.
(6) The continuous fiber composite materials 3a and 3b manufactured in the previous step are adhered to the support 2 and the magnetic head slider 1 manufactured by the conventional manufacturing method as shown in FIG. 1 or FIG. Further, a signal lead pattern is formed on the back surface of the support 2 by etching or the like.
[0044]
When manufacturing the support 7 made of the fiber-reinforced composite material or the continuous fiber composite materials 3a and 3b, the material is completely cured in the step (3) and cut into a predetermined shape by conventional machining.
[0045]
【The invention's effect】
According to the present invention, the amount of wear on the recording medium surface and the slider surface can be minimized, and a stable contact state can be maintained while rotating at high speed and seeking at high speed. It is possible to provide a magnetic head slider excellent in recording density and high reliability, its support, its manufacturing method, and a magnetic disk drive.
[Brief description of the drawings]
FIG. 1 is a diagram showing a magnetic head slider and its support according to a first embodiment of the present invention.
FIG. 2 is a diagram illustrating the operation of a magnetic head slider and its support according to the first embodiment of the present invention.
FIG. 3 is a diagram showing a magnetic head slider and its support according to a second embodiment of the present invention.
FIG. 4 is a diagram showing a magnetic head slider and a support thereof according to a third embodiment of the present invention.
FIG. 5 is a view showing a magnetic head slider and a support thereof according to a fourth embodiment of the present invention.
FIG. 6 is a diagram showing an embodiment in which the magnetic head slider according to the first embodiment of the present invention is mounted on a conventional contact recording type support.
FIG. 7 is a diagram showing an embodiment in which the magnetic head slider according to the second or third embodiment of the present invention is mounted on a conventional flying recording type support.
FIG. 8 is a diagram showing an embodiment of a magnetic disk drive according to the present invention.
FIG. 9 is a diagram illustrating a method of manufacturing the magnetic head slider and the support thereof according to the first embodiment of the present invention.
FIG. 10 is a diagram illustrating a method of manufacturing the magnetic head slider and its support according to the first embodiment of the present invention.
[Explanation of symbols]
1, 4, 5, 10, 11, 12 Magnetic head slider 1a, 4a, 5a Contact part 1b Magnetic transducer 1c Gap part 1d of magnetic transducer Connection terminal 2 Support for magnetic head slider (load beam part)
3 Fiber-reinforced composite material 3a, 3b, 4a, 4b, 6a, 6b with fiber orientation crossing 90 degrees Continuous fiber composite material 7 Load beam part (support) composed of fiber-reinforced composite material
8 Contact recording beam beam (support)
Reference Signs List 9 Floating recording type support 20 Magnetic recording medium 21 Drive 22 for rotating magnetic recording medium Support arm 23 Support arm drive 24 Recording / reproduction signal processing circuit 25 Mounting reference plane θ Mounting angle 30 Fiber 31 Matrix material and solvent 32 Matrix and solvent container 33 Roller 34 Matrix material adjuster 35 Pin 36 Guide plate 37, 38 Continuous fiber composite material 39 Press

Claims (12)

A contact slider equipped with a magnetic transducer and provided with a contact surface in contact with a recording medium surface is connected to a support with a fiber reinforced composite material interposed therebetween, and the fiber reinforced composite material has a plurality of anisotropic fibers. A magnetic head slider, wherein the continuous fiber composite material is laminated so that the degree of fiber orientation crosses 90 degrees. A contact slider equipped with a magnetic transducer and provided with a contact surface in contact with a recording medium surface is connected to a support with a fiber reinforced composite material interposed therebetween, and the fiber reinforced composite material has a plurality of anisotropic fibers. Is a structure in which the continuous fiber composite material is laminated so that the degree of orientation of the fibers intersects at 90 degrees, and the support is a flexible member that can be a load beam portion that applies a load to the contact slider. A magnetic head slider characterized by the above-mentioned. Mounted on a flexible body that can be a load beam part that applies a load, a magnetic recording medium is equipped with a magnetic transducer capable of recording or reproducing signals, and recording while contacting or intermittent contact running on the rotating magnetic recording medium surface A magnetic head slider that reproduces, and moves to record or reproduce in another area of the magnetic recording medium, and a material to be attached to the flexible body, the material of the flexible body and the magnetic head slider. Having members of different materials, the members of the different materials are composed of fiber-reinforced composite material members, and the fiber-reinforced composite material members are a plurality of continuous fiber composite material members having anisotropy. A magnetic head slider having a structure in which fibers are laminated so that the degree of orientation of the fibers crosses at 90 degrees . 4. The magnetic head slider according to claim 3 , further comprising a contact portion between the two continuous fiber composite materials having anisotropy. 4. The magnetic head slider according to claim 3 , wherein the matrix material of the fiber-reinforced composite material member is made of a thermoplastic such as polystyrene or polyethylene. 4. The magnetic head slider according to claim 3 , wherein the matrix material of the fiber-reinforced composite material member is made of a thermosetting plastic such as phenol resin, epoxy resin, and polyurethane. 4. The magnetic head slider according to claim 3 , wherein the matrix material of the fiber reinforced composite material member is made of natural rubber. 4. The magnetic head slider according to claim 3 , wherein the matrix material of the fiber reinforced composite material member is made of synthetic rubber such as urethane rubber and acrylic rubber. 4. The magnetic head slider according to claim 3 , wherein the fiber material of the fiber-reinforced composite material member is made of glass, boron, silicon, carbide, alumina, stabilized zirconia, graphite, or carbon. Head slider. Support of the magnetic head slider for supporting a magnetic head slider according to any one of claims 1 to 9. A magnetic disk device having a magnetic head slider according to any one of claims 1 to 10. The fiber around which the matrix material is adhered is wound with a constant torque into a plate shape, and the plate-shaped member is dried to remove the solvent to produce a continuous fiber composite material. Semi-cured in a heating furnace while being pressed at a constant pressure by a pair of presses. Further, two continuous fiber composite materials are laminated so that the orientation degree of the fibers intersects at 90 degrees. By curing in a heating furnace while being pressed at a constant pressure by a pair of presses, a laminated member having anisotropy of the continuous fiber composite material is manufactured, and then the continuous fiber composite material manufactured in the previous step is laminated. A magnetic head slider formed by cutting a member into a predetermined shape and using the member as a connecting member between the magnetic head slider and its support, and forming a signal lead pattern on the back surface of the support by etching or the like; And a manufacturing method of the support.

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