JP2882139B2 - Composite floating head slider - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite floating head slider used for a magnetic disk drive, and more particularly to a structure of a composite floating head slider.

[0002]

2. Description of the Related Art In a conventional magnetic disk drive, a contact start / stop (CS
S) method is used. This is a method in which the magnetic disk drive is started / stopped while the magnetic disk and the floating head slider are in contact with each other, and prevents the floating head slider and the magnetic disk from adsorbing while the magnetic disk drive is stopped. To avoid this, the surface of the magnetic disk had to be appropriately roughened. For this reason, the flying height of the floating head slider has to be secured more than necessary, which hinders an improvement in recording density. Further, the generation of dust related to friction and wear during CSS is inevitable, which is a factor that hinders the improvement of the reliability of the apparatus. However, demands for higher recording density, higher speed access, and higher transfer rate of the magnetic disk device are remarkable, and it is necessary to lower the flying height of the floating head slider.

In order to increase the areal recording density and achieve perpendicular magnetic recording, the flying height of a magnetic head is 0.05.
Although it is approaching a micron or less, it is necessary to increase the smoothness of the pressure generating surface of the floating head slider and the surface of the magnetic disk inevitably. The danger of suction of the floating head slider is increasing. As means for solving the problem of attraction between the floating head slider and the magnetic disk, a floating head slider and a load / unload mechanism for starting and stopping the magnetic disk device without bringing the floating head slider into contact with the magnetic disk have been developed. Is coming.

On the other hand, the acceleration at the time of access is increasing in order to realize high-speed access. However, the fluctuation of the attitude of the floating head slider at the time of maximum acceleration / deceleration is suppressed as much as possible, and the floating head slider is moved in order to avoid contact with the magnetic disk. There is a tendency to reduce the size of the head slider and to propose a moment of inertia around the center of gravity.

[0005]

In the region where the flying height of the magnetic head is 0.05 μm or less, the floating head slider and the magnetic disk are intermittent even during tracking in consideration of the protective film and the lubricant on the surface of the magnetic disk. There is a high possibility that they are in contact with each other, and the possibility is further increased during access. Therefore, in order to minimize the occurrence of damage to the magnetic head and scratches on the surface of the magnetic disk due to contact, it is desirable to make the floating head slider small. This miniaturization is convenient for realizing high-speed access as described above. However, in the process of reducing the size and lowering the flying height of the floating head slider, the load applied to the floating head slider by a load spring or the like is considerably reduced. For this reason, it becomes difficult to control the load by bending the load spring.

Further, since the floating head slider itself is small, it is difficult to accurately attach the floating head slider to the suspension. Also, as described above, when the load / unload mechanism is used to prevent the floating head slider from adhering to the magnetic disk when the magnetic disk device is stopped, the floating head slider using positive pressure requires a reduction in size. Since the positive pressure generating force is reduced, the risk of contact between the magnetic disk and the floating head slider becomes extremely high at the time of loading in which the floating head slider approaches the surface of the magnetic disk and is brought into a steady flying state. Next, in the negative pressure utilizing floating head slider, it is necessary to load the floating head slider by the load / unload mechanism to the floating gap which is spontaneously loaded by the action of the fluid actuator. Since the generated force is reduced, the flying clearance at the start of loading is on the order of submicrons, and it is not easy to control the floating head slider and the magnetic disk to approach the distance.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to facilitate the miniaturization of a floating head slider on which a magnetic head is mounted, to suppress suction and contact between a magnetic disk and a floating head slider, An object of the present invention is to provide a composite floating head slider which achieves a flying height in a sub-submicron region while improving the reliability of a head disk interface.

[0008]

SUMMARY OF THE INVENTION A composite floating head slider according to the present invention has a double-body type positive pressure air bearing surface, a negative pressure generating surface surrounded by the positive pressure air bearing surface, and a cross rail for generating a negative pressure. And a control mechanism for raising and lowering the cross rail, and a first negative pressure utilizing floating head slider on which a magnetic head is mounted, a suspension mechanism supporting the first negative pressure utilizing floating head slider, and the suspension A second negative pressure utilizing floating head slider supporting the mechanism, wherein the first and second negative pressure utilizing floating head sliders and the suspension mechanism are integrally formed, and the suspension mechanism is provided with the first negative pressure utilizing An outer peripheral portion of the positive pressure air bearing surface of the utilization floating head slider, and an inner periphery of a negative pressure generating surface surrounded by the positive pressure air bearing surface of the second negative pressure utilization floating head slider. Together form a unitary structure in minutes,
The positive pressure air bearing surfaces of the first and second negative pressure utilizing floating head sliders are formed on the same plane. The composite floating head slider may include a piezoelectric element mounted on the first negative pressure utilizing floating head slider and driving the cross rail, or a piezo bimorph.

[0009]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing a first embodiment of the present invention, and FIG. 2 is a perspective view thereof.

The composite floating head slider 1 according to the present embodiment comprises:
It is composed of two large and small negative pressure utilizing floating head sliders, front recesses 2 and 3, tapers 4 to 7, cross rail 8, movable cross rail 9, and positive pressure generating rails 10 to 1.
3 and negative pressure generating recesses 14 and 15;
The suspension 16 is joined to the outer peripheral portion of the positive pressure air bearing surface of the magnetic head mounted slider 17 and the inner peripheral portion of the negative pressure generating surface surrounded by the positive pressure air receiving surface of another negative pressure utilizing floating slider. In addition to forming an integral structure, the positive pressure air bearing surfaces of these two large and small negative pressure utilizing floating sliders are formed on the same plane. The suspension 16 has the effect of suppressing the movement of the magnetic head mounted slider 17 in the pitch and roll directions.

Next, the operation of loading the composite floating head slider to the steady flying state using the load / unload mechanism will be described with reference to FIGS.

In the composite floating head slider 1, the steady flying height of the negative pressure utilizing large slider 20 is about 0.2 to 0.3 microns, and the negative pressure utilizing small slider 21 is 0.03 microns.
It is set to about 0.05 micron. Since the load suspension 23 is used without bending load, first,
The load / unload mechanism 24 is provided with the negative pressure utilizing large slider 20.
Is pushed down in the direction of the surface of the magnetic disk 25 indicated by the arrow, and the negative pressure generating force generated in the large negative pressure utilizing slider 20 is reduced by the load suspension 2.
Large slider 2 utilizing negative pressure up to a position larger than the reaction force 3
Move 0.

Thereafter, the large negative pressure utilizing slider 20 causes the load suspension 23 to be driven by the fluid actuator action by the negative pressure generated by the airflow flowing between the rotating magnetic disk 25 and the shape of the lower surface of the large negative pressure utilizing slider 20. It shifts spontaneously to a steady levitation state in which the reaction force and the negative pressure are balanced. FIGS. 4A and 4B are partial side views showing how the small slider 21 utilizing negative pressure is loaded. Here, an example in which a linear motor is used as a movable cross rail drive mechanism is shown. . FIG. 4A shows a state in which the movable cross rail 9 is on the same plane as the negative pressure recess 15 in the initial state, and the negative pressure utilizing small slider 21 acts as a positive pressure utilizing slider. FIG.
(B) shows a case in which loading is performed, and the linear motor 26 pushes the tapered portion of the movable cross rail 9 and lowers the movable cross rail 9 to gradually generate a negative pressure. The slider 21 is loaded on the magnetic disk 25, and the state shifts to a steady floating state where the reaction force of the suspension 16 supporting the small slider 21 utilizing negative pressure and the negative pressure are balanced, so that the read / write operation can be completely performed.

For unloading, first, when the linear motor 26 is returned, the movable cross rail 9 is raised by the reaction force of the leaf spring 27, and the negative pressure generating force is reduced. As a result, only positive pressure is generated on the rail of the small slider 21 utilizing negative pressure, and the unloading is completed. When the negative pressure utilizing large slider 20 is unloaded, the rotation speed of the magnetic disk 25 is reduced, the negative pressure generating force is reduced, and the unloading is performed by the reaction force of the suspension 16.

FIGS. 5A and 5B show a second embodiment of the present invention.
FIG. 4 is a partial side view showing the embodiment of FIG. Here, a laminated piezoelectric element 28 is used as a drive mechanism of the movable cross rail 9. FIG. 5A shows a state in which the negative pressure small slider is not loaded, and one end of the laminated piezoelectric element 28 has a fixed base 29.
The other end is in contact with the tapered portion of the movable cross rail 9. The leaf spring 27 has one end joined to the movable cross rail 9 and the other end in contact with the negative pressure small slider 21. FIG. 5B shows a state when loading is performed.

First, a voltage is applied to the laminated piezoelectric element 28 to expand it, and the tapered portion of the movable cross rail 9 is depressed to generate a negative pressure on the negative pressure generating surface. To load. Unloading removes the voltage applied to the laminated piezoelectric element 28,
The laminated piezoelectric element 28 returns to the original state (size), and the movable cross rail 9 is lifted by the reaction force of the leaf spring 27,
Unloading is performed by reducing the negative pressure.

FIGS. 6A and 6B show a third embodiment of the present invention.
FIG. 4 is a partial side view showing the embodiment of FIG. Here, a piezo bimorph 30 is used as a drive mechanism of the movable cross rail 9. FIG. 6A shows a state in which the piezo bimorph 30 is not loaded. One end of the piezo bimorph 30 is fixed to the support base 29, and the other end is in contact with the movable cross rail 9a. When loading, the movable crossrail 9a is pushed down by igniting and distorting the voltage to the piezo bimorph 30 to generate a negative pressure on the negative pressure generating surface, and the negative pressure utilizing small slider 21 is placed on the magnetic disk 25. To load. In the case of unloading, when the voltage applied to the piezo bimorph 30 is removed to remove the distortion, the movable cross rail 9a is lifted by the reaction force of the leaf spring 27, the negative pressure is reduced, and the negative pressure utilizing small slider is used. 21 performs unloading.

Although the embodiments of the present invention have been described in detail, the load / unload mechanism and the integrally formed suspension can be changed as long as they have predetermined characteristics. The description may be made without departing from the spirit of the invention, and the above description does not limit the scope of the invention.

[0020]

As described above, according to the present invention, there is provided a negative pressure floating head mechanism having a mechanism capable of controlling a negative pressure in which a magnetic head is mounted in a slider at the same level as a slider currently used. By including the slider, a slider of the same size as the magnetic head can be easily levitated by sub-submicron, and by combining with the load / unload mechanism, the suction between the floating head slider and the magnetic disk can be avoided. . Further, the flying height of the magnetic head can be increased at the time of access or other than recording / reproducing. As a result, a highly reliable magnetic disk device having a high recording density can be obtained.

[Brief description of the drawings]

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

FIG. 2 is a partial perspective view showing the first embodiment of the present invention.

FIG. 3 is a side view showing a state where a negative pressure utilizing large slider is loaded in the first embodiment of the present invention.

FIG. 4 is a partial side view showing a state where the negative pressure utilizing small slider is unloaded and loaded in the first embodiment of the present invention.

FIG. 5 is a perspective view showing a state in which a small slider utilizing negative pressure is unloaded and loaded in a second embodiment of the present invention.

FIG. 6 is a perspective view showing a state where a negative pressure utilizing small slider is unloaded and loaded in a third embodiment of the present invention.

[Description of Signs] 1 Composite floating head slider 2, 3 Front recess 4-7 Taper 8 Cross rail 9, 9a Movable cross rail 10-13 Positive pressure generating rail 14, 15 Negative pressure generating recess 16 Suspension 17 Magnetic head mounted slider 18 Magnetic head 20 Negative pressure utilizing large slider 21 Negative pressure utilizing small slider 23 Load suspension 24 Load unloading mechanism 25 Magnetic disk 26 Linear motor 27 Leaf spring 28 Multilayer piezoelectric element 29 Fixed table 30 Piezo bimorph

Claims (3)

(57) [Claims] A catamaran type positive pressure air bearing surface, a negative pressure generating surface surrounded by the positive pressure air bearing surface, a cross rail for generating a negative pressure, and a control mechanism for raising and lowering the cross rail. And a first negative pressure utilizing floating head slider on which a magnetic head is mounted, a suspension mechanism supporting the first negative pressure utilizing floating head slider, and a second negative pressure utilizing floating head slider supporting the suspension mechanism Wherein the first and second negative pressure utilizing floating head sliders and the suspension mechanism are integrally formed, and the suspension mechanism comprises an outer peripheral portion of a positive pressure air bearing surface of the first negative pressure utilizing floating head slider. And an integral structure at the inner peripheral portion of the negative pressure generating surface surrounded by the positive pressure air bearing surface of the second negative pressure utilizing floating head slider, and the first and second Wherein the positive pressure air bearing surface of the negative pressure utilizing floating head slider is formed on the same plane. 2. The composite floating head slider according to claim 1, further comprising a piezoelectric element mounted on said first negative pressure utilizing floating head slider and driving said cross rail. 3. The composite floating head slider according to claim 1, further comprising a piezo bimorph mounted on said first negative pressure utilizing floating head slider and driving said cross rail.