JPH0555952B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floating head support mechanism used in a magnetic disk device.

[Conventional technology]

Generally, a floating head slider, which is a dynamic pressure type gas bearing, is used as a magnetic head in a magnetic disk device. With the increase in capacity and density of magnetic disk devices, the floating amount of floating head sliders has become extremely small, and currently submicron order sliders are in practical use. The floating head slider maintains its floating amount stably and travels against the runout of a magnetic disk medium rotating at high speed and minute protrusions on the surface of the medium due to machining, thereby increasing the reliability of the device. It is supported by a gimbal spring, which is an extremely flexible spring that does not restrict the free movement of the floating head slider. Generally, a suspension spring is connected to the gimbal spring, which has the role of applying a load to the floating head slider and supporting the floating head slider.

FIG. 5 is a perspective view showing a conventional floating head support mechanism, in which 7 is a floating head slider, 2 is a gimbal spring, and 3 is a suspension spring. The suspension spring 3 is connected to an actuator mechanism (not shown) for positioning the slider, and the floating head support mechanism is positioned at a desired track on the surface of the magnetic disk medium at high speed. floating head slider 7
A high pressure is generated between the head slider 7 and the magnetic disk medium due to the hydrodynamic action of air during operation of the device, and as a result, the floating head slider 7 floats above the surface of the magnetic disk medium, but the amount of levitation is maintained at an optimum level. Therefore, an appropriate load is applied to the floating head slider 7 by the tension bending effect of the suspension spring 3.

In a normal magnetic disk device, the floating head slider 7 and the magnetic disk medium surface come into contact with each other during the suspension due to the loading effect of the suspension spring 3, and the air flow generated when the magnetic disk medium is started to rotate. A so-called contact start/stop method is used in which the floating head slider is made to float due to the effect of . In this system, while the magnetic disk medium is rotating at a low speed, almost no buoyancy force is generated on the floating head slider 7, so the floating head slider 7 and the magnetic disk medium come into contact and slide.

[Problem that the invention seeks to solve]

A typical floating head slider 7 is made of extremely hard material such as ferrite or ceramic, and its air lubricating surface is polished to achieve a finer floating amount. On the other hand, magnetic disk media has a protective film layer on the surface to protect data and a lubricant coated to improve sliding properties between the slider and magnetic disk media during contact start/stop, but the hardness of the magnetic disk media is It is considerably smaller than the floating head slider 7. Therefore, when a contact start/stop is performed, a so-called head crash may occur in which the recording medium of the magnetic disk is scraped off due to the sliding contact between the floating head slider 7 and the magnetic disk medium. If a magnetic disk medium is scratched, the information recorded at that location will be erased, and the reliability of the device will be lost.

Furthermore, in order to realize high-density recording, it is important to reduce the flying height of the floating head slider 7. 6th
The figure shows a floating head support mechanism using a negative pressure type floating head slider in order to further reduce the flying height of the floating head slider. In the figure, 1 is a negative pressure-utilizing floating head slider, 2 is a gimbal spring, and 3 is a suspension spring. The negative pressure type floating head slider 1 utilizes the negative pressure effect generated by providing a negative pressure generating surface on the air lubricating surface in addition to the slider pressing force by the suspension spring 3 to achieve a low floating amount. It is something. In this case, the slider is attracted toward the magnetic disk medium due to the generation of negative pressure.
The pressing force of the slider against the magnetic disk medium by the suspension spring 3 is small, and the friction between the slider and the magnetic disk medium is also small, which is convenient for performing contact start and stop operations. However, in order to achieve a low flying height, the surface roughness of the lubricating surfaces of the magnetic disk medium and the negative pressure type floating head slider 1 must be made as small as possible. This is because if there is protrusion-like roughness on both surfaces, it will also cause head crushing. For this reason, the lubricated surfaces of the magnetic disk medium and the negative pressure-utilizing floating head slider 1 are finished in a mirror-like finish, but as the precision of the surface finish increases, problems such as adhesion between the two surfaces arise. This causes a strong adhesion force between the floating head slider and the magnetic disk medium that are in contact when the magnetic disk drive is stopped, resulting in problems such as the inability to start rotation of the magnetic disk medium. It goes without saying that such phenomena such as adsorption also pose a problem in the above-mentioned floating head support mechanism that uses a floating head slider that does not utilize negative pressure.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a floating head support mechanism utilizing negative pressure that does not cause problems such as head crushing and adsorption.

[Means for solving problems]

The negative pressure type floating head support mechanism of the present invention includes a gimbal spring that supports a negative pressure type floating head slider having a mechanism for generating negative pressure on an air lubricated surface, and a suspension spring that supports this gimbal spring at one end. , one end is joined to the other end of this suspension spring, and has a fulcrum in the middle part,
It is characterized by comprising a displacement magnifying mechanism section that performs a lever action, and a piezoelectric laminated ceramic actuator that is connected to the other end of the displacement magnifying mechanism section and generates displacement by applying a voltage.

[Effect]

According to the negative pressure type floating head support mechanism of the present invention, a voltage is applied to the piezoelectric laminated ceramic of the gimbal spring that supports the negative pressure type floating head slider and the suspension spring that supports the gimbal spring at one end. The structure is such that the displacement can be increased by an actuate mechanism that increases the displacement caused by the magnetic disk through a displacement magnification mechanism, and from the time the magnetic disk stops rotating to the time of low speed, the floating head slider and the magnetic disk medium are After the magnetic disk medium is sufficiently accelerated, the floating head slider is actuated by the mechanism described above to move the floating head slider to a position where self-loading is possible, and then the floating head slider is moved smoothly against the magnetic disk medium. As a result, the disadvantages of magnetic disk drives that perform contact start/stop, such as head crushing and adsorption, can be eliminated.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing a first embodiment of the negative pressure-utilizing floating head support mechanism of the present invention;
The figure is a side view of this embodiment. This floating head support mechanism is of a type that sandwiches both sides of a single magnetic disk medium. In the figure, 1 is a negative pressure-utilizing floating head slider, 2 is a gimbal spring, 3 is a suspension spring, 4 is a displacement magnification mechanism, 5 is a piezoelectric laminated ceramic actuator, and 6 is a suspension spring.
is a magnetic disk medium. Displacement magnification mechanism section 4
is composed of an upper beam 8a and a lower beam 8b arranged to face each other, and a fulcrum 9 provided in the middle of these beams in the longitudinal direction.

The negative pressure type floating head slider 1 is connected to a gimbal spring 2, and the gimbal spring 2 is connected to one end of a suspension spring 3. A pair of support devices in which these components are integrated are connected to one end of the displacement magnifying mechanism section 4, that is, one end of the upper beam 8a and the lower beam 8b, respectively, by the other end of the suspension spring 3. . A piezoelectric laminated ceramic actuator 5 is joined to the other end of the displacement magnification mechanism section 4 in a manner that connects the upper beam 8a and the lower beam 8b. By applying a voltage to this piezoelectric laminated ceramic actuator 5 from a voltage supply device (not shown), displacement is caused in the piezoelectric laminated ceramic actuator 5, and the displacement is applied to the other ends of the upper beam 8a and the lower beam 8b. and displaces one end of these beams on the side of the support device by the lever principle via the fulcrum 9. That is, the displacement of the actuator 5 is magnified via the displacement magnification mechanism 4 using the principle of lever, and the negative pressure utilizing type floating head slider 1 attached to the end is actuated.

A feature of the negative pressure type floating head slider is the self-loading effect of the slider. This is because when the lubricated surface of the slider is brought close to the magnetic disk medium at a distance of several tens of microns, although this varies depending on the performance of the slider, an air layer is generated between the lubricated surface and the magnetic disk medium. Because of the negative pressure, the movable slider is attracted to the surface of the magnetic disk medium, so that the slider is loaded smoothly.

According to the support mechanism of this embodiment, first, the distance between the slider lubricated surface and the magnetic disk medium surface is 0.1 mm.
Position the displacement amplifying mechanism 4 and the piezoelectric laminated ceramic actuator 5 so that is applied, and the obtained displacement of about several microns is amplified by the lever principle via the displacement amplification mechanism 4, thereby making it possible to displace the negative pressure type floating head slider 1 to a position where self-loading is possible. Thereafter, the slider rapidly floats steadily at a predetermined submicron floating amount due to its own self-loading effect.

FIG. 3 is a perspective view showing a second embodiment of the floating head support mechanism utilizing negative pressure according to the present invention.
This floating head support mechanism is of the type inserted between two magnetic disk media. Third
In the figure, 1 is a floating head slider using negative pressure, 2 is a gimbal spring, 3 is a suspension spring, 10 is a displacement magnification mechanism, and 5 is a piezoelectric laminated ceramic actuator. The displacement magnifying mechanism section in this embodiment includes an upper beam 11a and a lower beam 11b which are curved so that the supporting device sides are close to each other and are arranged facing each other, and a fulcrum provided in the middle of these beams in the longitudinal direction. It consists of 9. A pair of support devices, in which a negative pressure-utilizing floating head slider 1, a gimbal spring 2, and a suspension spring 3 are integrated, are each connected to one end of the adjacent beams 11a and 11b.
Further, a piezoelectric laminated ceramic actuator 5 is bonded between the other ends of the beams 11a and 11b, as in the first embodiment. The principle of head loading in this second embodiment is the same as that in the first embodiment.

FIG. 4 is a perspective view showing a third embodiment of a floating head support mechanism utilizing negative pressure according to the present invention. In the first and second embodiments two at a time
Although the embodiment is shown in which two head sliders are loaded, in this embodiment, one head slider is loaded. In FIG. 4, numeral 1 is a floating head slider utilizing negative pressure, numeral 2 is a gimbal spring, numeral 3 is a suspension spring, numeral 12 is a displacement magnification mechanism, and numeral 5 is a piezoelectric laminated ceramic actuator. The displacement magnifying mechanism section in this embodiment includes a beam 13, a fulcrum 9, and a holding section 14 connected to the fulcrum and for joining the piezoelectric laminated ceramic actuator 5 to one end of the beam 13. ing. The other end of the beam 13 is joined to a support device in which a negative pressure-utilizing floating head slider 1, a gimbal spring 2, and a suspension spring 3 are integrated. The principle of head loading in this third embodiment is also the same as in the first and second embodiments.

〔Effect of the invention〕

As described above, according to the present invention, a negative pressure-utilizing floating head support mechanism that does not cause problems such as head crushing and adsorption can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of a floating head support mechanism using negative pressure of the present invention, FIG. 2 is a side view of the first embodiment, and FIG. 3 is a perspective view of a floating head support mechanism of the present invention using negative pressure. a perspective view of a second embodiment of the floating head support mechanism;
FIG. 4 is a perspective view showing a third embodiment of a floating head support mechanism using negative pressure according to the present invention, FIG. 5 is a perspective view showing a conventional floating head support mechanism, and FIG. 6 is a perspective view showing a conventional floating head support mechanism using negative pressure. FIG. 3 is a perspective view showing a mold floating head support mechanism. 1... Negative pressure utilization type floating head slider, 2...
Gimbal spring, 3...Suspension spring, 4,
DESCRIPTION OF SYMBOLS 10, 12... Displacement magnification mechanism part, 5... Piezoelectric laminated ceramic actuator, 6... Magnetic disk medium, 8a, 8b... Beam, 9... Fulcrum.

Claims (1)

[Claims] 1. A gimbal spring that supports a negative pressure floating head slider that has a mechanism that generates negative pressure on an air lubricating surface, a suspension spring that supports this gimbal spring at one end, and one end that is connected to the other end of this suspension spring. a displacement magnifying mechanism section that has a fulcrum in the middle and performs a lever action; and a piezoelectric laminated ceramic actuator that is connected to the other end of the displacement magnifying mechanism section and that generates displacement by applying a voltage. A floating head support mechanism utilizing negative pressure, characterized by comprising: