JPH01107382A - Negative pressure utility type floating head load mechanism - Google Patents

Abstract

PURPOSE:To prevent a head crash and the adsorption of a head by connecting a piezo-electric element with a piezo-electric actuator and bending the piezo-electric actuator on both sides in the vertical direction of piezo-electric element surface. CONSTITUTION:A first negative pressure utility type floating head slider 1a is loaded. Next, a voltage is added by the driving circuit 11 of the piezo-electric actuator 5 connected with the piezo-electric element so that the piezo-electric actuator 5 is bent in the opposite direction of the loading direction of the first negative pressure utility type floating head slider 1a. Consequently, a second negative pressure utility type floating head slider 2a can be loaded on the surface of a second magnetic disk medium in the same way as the first negative pressure utility type floating head slider 1a. Thus, the defect of a magnetic disk device executing contact start/stop, which is the head crash and adsorption, can be removed.

Description

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

[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 drive. With the increase in the capacity and density of devices, the flying height of floating head sliders has become extremely small, and currently submicron order sliders are in practical use. The floating head slider travels while maintaining its levitation stably against the runouts and minute protrusions of the magnetic disk medium rotating at high speed.In order to improve the reliability of the device, the floating head slider can move freely. It is supported by gimbal springs, which are non-constraining and highly flexible springs.

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. 8 is a perspective view showing a conventional floating head support mechanism, in which 13 is a floating slider, 2 is a gimbal spring, and 3 is a suspension spring. The floating head support mechanism is connected to an actuator mechanism (not shown) and is positioned over the magnetic disk medium surface at high speed. During operation of the device, high pressure is generated between the floating head slider 13 and the magnetic disk medium due to the hydrodynamic action of air, and as a result, the floating head slider 13 floats above the surface of the magnetic disk medium. In order to hold the floating head slider 13 in place, a suspension spring 3 is provided at the base of the suspension spring 3 by bending.

The appropriate load is applied to the spring bend due to the load-bearing effect of tension bending in the section.

In a normal magnetic disk device, the floating head slider 13 and the magnetic disk medium surface come into contact with each other while the magnetic disk is stopped due to the load effect of the suspension spring 3.
The so-called contact-start stop method is used, in which the tosslider 13t" is made to float by the effect of air flow generated by starting the disk medium to rotate. In this method, the magnetic disk is rotated at a low speed from a stopped state. Since almost no levitation force is generated on the floating head slider 13 during this period, the toss slider 13 and the magnetic disk medium come into contact and slide during the period of floating.

[Problem that the invention seeks to solve]

Usually, the floating head slider 13 is made of Alz03-Ti-C
It is made of extremely hard materials such as
Polishing is performed to achieve i. On the other hand, magnetic disk media have a surface coated with a protective film layer for protection and a camphor lubricant with good sliding properties, but the hardness is much lower than that of the tosslider 13. Therefore, when contact start/stop is performed, a so-called head crash may occur in which the magnetic disk medium is scraped due to contact sliding between the floating head slider 13 and the magnetic disk medium. If the magnetic disk medium is scratched, the information recorded at that location will disappear in an instant, and the reliability of the fruiting device will be impaired.

In addition, in order to realize high-density recording, it is important to reduce the amount of floating of the toslider 13, and the technology for this purpose is to intentionally generate negative pressure on the lubricated surface of the tosslider, and to improve the floating head and magnetic disk. There is a method of reducing the gap by using the suction force between the media and the media. When such a negative pressure type floating head slider is used, the surface roughness of the magnetic disk medium and the floating head slider 13 must be made as small as possible.

This is because if there is a protrusion-like roughness on both surfaces, it may cause cracks and crashes. Therefore, the magnetic disk medium and the floating head slider 130
The surface is finished to a mirror finish, but as the precision of the surface finish increases, problems such as adsorption occur. This is a phenomenon in which a strong adhesion force is generated between the floating head slider and the magnetic disk medium that are in contact when the magnetic disk drive is stopped, making it impossible to start rotating the magnetic disk.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a negative pressure-utilizing floating head loading mechanism that eliminates the above-mentioned conventional drawbacks and does not cause problems such as head crushing, head adsorption, and so on.

[Means to solve the problem]

A floating head loading mechanism using negative pressure according to the present invention includes a floating head support mechanism including a gimbal spring that supports a floating head slider using negative pressure, a suspension spring that supports the gimbal spring at one end, and a flexible An elastic body is sandwiched between two piezoelectric elements, and at least one plate-shaped piezoelectric actuator is provided on both sides of the piezoelectric element in a direction perpendicular to the surface of the piezoelectric element. At least one floating head support mechanism is connected to each of both sides of the piezoelectric actuator through the piezoelectric actuator, and a positioner mechanism is connected to the other end of the piezoelectric actuator directly or through an arm, and is connected to the piezoelectric actuator. The piezoelectric actuator is configured to include a drive circuit that deflects the piezoelectric actuator on both sides in a direction perpendicular to the surface of the piezoelectric element.

[Effect]

According to the floating head loading mechanism using negative pressure of the present invention, at least one piezoelectric actuator is connected to one end of the suspension spring, and the suspension spring is floated under negative pressure.

The toss slider is set to be away from the magnetic disk surface when the magnetic disk is stopped, and when the magnetic disk rotates to a sufficient speed that contact sliding between the floating head slider and the magnetic disk medium does not occur. When
A piezoelectric actuator drive circuit connected to a piezoelectric element so that the piezoelectric actuator deflects in one direction perpendicular to the piezoelectric actuator applies a voltage to first cause the negative pressure utilization type head slider (10) to access the magnetic disk medium surface. Thereafter, the negative pressure utilizing floating head slider is loaded onto the first medium side by a negative pressure suction force generated between the accessed negative pressure utilizing floating head slider and the magnetic disk medium.

After the 10 negative pressure type floating head slider was loaded, the piezoelectric actuator was connected to the piezoelectric element so as to bend in the opposite direction to the loading direction of the first negative pressure type floating head slider perpendicular to the piezoelectric actuator. By applying voltage to the drive circuit of the piezoelectric actuator, it is possible to load the magnetic disk medium surface of the toslider tg2 to the second negative pressure type floating head slider as well as to the first negative pressure type floating head slider, As a result, all of the drawbacks of magnetic disk drives that perform contact start/stop, such as head crashes and adsorption, can be eliminated.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a negative pressure utilizing type floating head loading mechanism of the present invention, in which (a) shows a side view and (b) shows a front view. In the figure, la and lb are negative pressure-utilizing floating head sliders, 2a and 2b are gimbal springs, 3a and 3b are suspension springs, 4 is a fixed block, 5 is a piezoelectric actuator, 6 is an arm block, 7 is a terminal, and 8 9 is a lead wire, 9 is an arm, [) is a positioner mechanism, and 11 is a drive circuit.

The negative pressure-utilizing floating head sliders Ia and Ib are connected to gimbal springs 2a and 2b, respectively.
b is joined to the suspension springs 3a and 3b. The suspension springs 3a, 3bti are connected to the fixed block 4 from both sides at one end thereof. A piezoelectric actuator 5 is joined to one end of the fixed block 4. Furthermore, an arm block 6 is joined to the other end of the piezoelectric actuator 5.

The other end of arm block 6 is coupled to arm 9.

The arm 9 is connected to a positioning mechanism 10 at its other end. The piezoelectric actuator 5 is composed of several piezoelectric elements and an elastic body, and a lead wire 8 for supplying voltage is attached to them, and the lead wire is connected to a terminal 7 provided on the arm pro 6. . A lead wire 8 is further attached to the terminal 7, and the other end is connected to a drive circuit 11 of the piezoelectric actuator 5.

FIG. 2 is a partial side view for explaining the operation of the negative pressure-utilizing floating head loading mechanism of the present invention, with the arm 9 and positioner mechanism 10 shown in FIGS. Further, for the sake of simplicity, the terminal 7, which is used as a relay stop for the wiring, is also omitted.

First, the piezoelectric actuator 5 is a piezoelectric element 51a.

51b, 53a, 53b and elastic bodies 52a, 52b. The piezoelectric elements 51a, 51b, 53a, 53b and the elastic bodies 52a, 52b are each in the form of a thin plate.
The piezoelectric elements 51a, 53a, 51b, and 53b are each polarized in the transverse direction. And the + side of 51a and 5
In this embodiment, two piezoelectric actuators are used, which are constituted by the + side of 3a, the + side of 51b, two piezoelectric elements, and one elastic body.

The conductive elastic bodies 52a and 52b are connected to the terminal PK of the drive circuit 11 through a lead i8. piezoelectric element 51a,
51b is similarly connected to terminal Q by lead wire 8. The piezoelectric elements 53a and 53b are similarly connected to the terminal RK by the lead wire 8.

In reality, by driving the piezoelectric actuators from the C, Q, and 8 sides using a common potential at terminal P, the portion from ri 4 to the tip of the fixed plate is displaced in both directions perpendicular to the piezoelectric element. be able to.

FIGS. 3 to 7 are explanatory diagrams illustrating the operation of the draw mechanism in the negative pressure utilization type floating of this embodiment.

FIG. 3 shows the setting state from the time when the apparatus is stopped until the magnetic disk reaches a steady rotation speed. First, it is driven by applying voltage to the terminals P and Q of the drive circuit 11, and when the negative pressure type floating head slider 1a accesses the upper magnetic disk 12a, as shown in FIG. Due to the negative pressure generated between the air lubricated surface of the type floating head slider 1a and the surface of the magnetic disk lZa, the negative pressure type floating head slider 1a slides over the magnetic disk 12a.
loaded onto the surface of the Once the head is loaded, an extremely rigid air film is generated between the slider lubricated surface and the magnetic disk surface, so the gimbal spring 2a and suspension spring 3a'Q that support the head move away from the magnetic disk. The head will not be unloaded even if you pull it.

FIG. 5 shows a case where, after the negative pressure utilizing type floating head slider la in FIG. 4 is loaded, the voltage applied to the piezoelectric actuator is removed and the piezoelectric actuator 5 is brought into a flat state. In this state, the negative pressure type floating head slider 1a remains loaded on the magnetic disk 12a, but the negative pressure type floating head slider 1a remains loaded on the magnetic disk 12a.
b remains in the initial setting shown in FIG.

Then, as shown in FIG. 6, by applying voltage to the terminals P and R of the drive circuit 11, the piezoelectric actuator 5 is deflected in the opposite direction to that shown in FIG. To floating, toss slider 1b is magnetic disk 12
b.

Thereafter, as shown in FIG. 7, when the voltage applied to the piezoelectric actuator 5 is removed again, the piezoelectric actuator 5 returns to the neutral position and completes the head loading operation. The device is thus in normal operating condition. The positioner mechanism 10 moves the head above the recording track recorded on the magnetic disks 12a, 12b.

〔Effect of the invention〕

According to the negative pressure-utilizing floating head loading mechanism of the present invention, at least one piezoelectric actuator is connected to one end of the suspension spring, and the negative pressure floating head slider Ti is moved away from the surface of the magnetic disk while the magnetic disk is stopped. Set this so that the piezoelectric actuator will deflect in one direction perpendicular to the piezoelectric actuator when the magnetic disk rotates to a sufficient speed and the floating head slider and the magnetic disk medium do not come into contact with each other. A piezoelectric actuator drive circuit connected to a piezoelectric element applies voltage to the first negative pressure head slider to access the magnetic disk medium surface, and then the accessed negative pressure floating head A negative pressure utilizing floating head slider is loaded onto the first medium side by a negative pressure suction force generated between the slider and the magnetic disk medium.

After the tosslider is loaded into the first negative pressure floating type, the piezoelectric element is loaded into the first negative pressure type floating perpendicular to the piezoelectric actuator so that the piezoelectric 7 cutuator is deflected in the opposite direction to the loading direction of the tosslider. By applying voltage through the drive circuit of the connected piezoelectric actuator, the second negative pressure is
1 type floating head slider can be loaded onto the surface of the second magnetic disk medium, resulting in head crash or adsorption during contact start/stop. It has the effect of not causing any damage.

[Brief explanation of the drawing]

1(a) and (b) are a side view and a front view showing an embodiment of a negative pressure-utilizing floating head loading mechanism according to the present invention, and FIG. 2 is a portion showing details of the mechanism shown in FIG. 1. A side view and FIGS. 3 to 7 are explanatory diagrams showing the operation of the negative pressure-utilizing floating head loading mechanism according to the present invention, and FIG. 8 is a perspective view showing a conventional floating head loading mechanism. Ha, 1b... Negative pressure utilization type floating head slider, 2a, 2b... Gimbal spring, 3a, 3b.
... Suspension spring, 4 ... Fixed flock, 5 ... Piezoelectric actuator, 9 ...
... Arm, 10 ... Positioner mechanism, 11
...Drive circuit, 51a, 51b. 53a, 53b-'・'Piezoelectric element, 52a, 5
2b...Elastic body. Agent Patent Attorney Uchihara Onkan 1 Tahaku 2 Figure 3 Side Haku 4 Engraving 1z6 Af55 Old/Zb Figure 7/2a

Claims (1)

[Claims] A floating head support mechanism including a gimbal spring that supports a negative pressure-utilizing floating head slider, a suspension spring that supports the gimbal spring at one end, and an elastic body formed by two deflectable piezoelectric elements. and at least one deflectable member on both sides of the piezoelectric element in a direction perpendicular to the surface of the piezoelectric element.
a plate-like piezoelectric actuator, at least one floating head support mechanism is connected to one end of the piezoelectric actuator directly or to both sides of the piezoelectric actuator via a fixing block, and A positioner mechanism is connected to the other end of the piezoelectric actuator directly or via an arm, and a drive circuit is connected to the piezoelectric actuator and deflects the piezoelectric actuator to both sides in a direction perpendicular to the surface of the piezoelectric element. A floating head loading mechanism that utilizes negative pressure.