JPS63879A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To easily rotate a magnetic disk, and to heighten the reliability of a device, by giving the distortion force on a slider attracted to the disk by a piezoelectric body, before rotating the magnetic disk. CONSTITUTION:A slider 2 is moved on a magnetic disk 1 rotating by a spindle 3 with an actuator 4. By adding an AC voltage on a piezoelectric body 6 mounted at the slider 2 before rotating the disk, the slider 2 attracted to the disk is shifted by a micro distance by the generated distortion force. Therefore, it is possible to easily rotate the disk 1, and to prevent the slider, etc., from being damaged, and to heighten the reliability of the device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device used in electronic computers and data processing devices.

[Conventional technology]

In recent years, the importance of external storage devices for magnetic disk devices in Kosipyuk systems has increased, and the demand for high recording densities has been increasing. A magnetic disk device consists of a recording/reproducing head and a magnetic disk as main components.The magnetic disk rotates at high speed, and the recording/reproducing head floats a minute distance above the magnetic disk. As the performance of magnetic recording devices improves, recording/reproduction/
In addition to reducing the load on the λrad, a contact start/stop (C55) type head levitation system is adopted. Here is an example or magazine (
Symposium "Drive technology in pure 1'p gas", 1986
As shown on page 34 (Precision Engineering Society of Japan) on the 18th and 19th of April 2015, in order to increase the recording density and improve the performance of magnetic disk devices, it is necessary to make the recording medium thinner and more uniform. In addition to improving uniformity and magnetic properties (improving coercive force and squareness ratio), we also ensure stable head flying conditions even at low flying heights.
It is important and necessary to improve disk surface precision to prevent collisions between heads and disks (hendo crash), and to improve head crush resistance.Recent improvements in disk surface precision have been remarkable, and The R□ of the disk used to be 2000 angstroms higher, but now R
□ is around 1000 angstroms, an improvement of more than one digit.

[Problem that the invention seeks to solve]

-On the other hand, as the surface precision of the disk has improved year by year, the magnetic helad slider sticks to the surface of the magnetic disk, and even when the magnetic disk starts rotating, the magnetic helad slider cannot levitate, resulting in damage to the magnetic helad slider etc. Problems such as this have arisen. (E, M, R
ossi et al., Journal of Applied Phys. 55, No. 6, 225.
4 pages).

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to prevent a magnetic herad slider from adhering to a magnetic disk and to obtain a highly reliable magnetic disk device.

Means for Solving Problem C] The magnetic disk device according to the present invention includes a rotating magnetic disk, which is in contact with the magnetic disk before the magnetic disk rotates, and when the magnetic disk rotates, the magnetic disk is moved over the magnetic disk by t.
The magnetic head is equipped with a magnetic head that moves in a T-motion state for recording and reproducing, and a strain generating means that applies a strain force to the magnetic head before rotating the magnetic disk.

[For production]

The magnetic disk drive device of this invention makes it possible to slightly shift the position of the magnetic slider that is attracted to the magnetic disk by applying a strain force to the magnetic slider before the magnetic disk starts rotating. Therefore, the adhesion force between the magnetic hent slider and the magnetic disk is also reduced, and the influence of the adsorption of the magnetic hent slider can be eliminated.

〔Example〕

The present invention will be described in detail below using a specific example, but the present invention is not limited thereto.

FIG. 1 is a sectional view showing a general magnetic disk device.
(I) is a magnetic disk, (2) is a magnetic 7jζ slide, (3) is a spindle that rotates the magnetic disk (1), (4) is an actuator that moves the magnetic head over the magnetic disk, and (5) is a filter. be. FIG. 2 is a partially enlarged configuration diagram of a head slig portion of a magnetic disk device according to an embodiment of the present invention. It has become. When an AC voltage is applied from the outside to the piezoelectric body (6) attached to the magnetic slider (2) before the shaft disk rotates, distortion occurs in the piezoelectric body (6), and the magnetic spatula 1: slider (2) and Apply strain force to the magnetic head.

Here, the surface roughness Rmaχ of the magnetic disk is 200 angstroms, and the magnetic disk slider 1, t
An IBM model 3380 thin film head was used.・Kannodsligt! ! When I left it standing for a day, it stuck and I was unable to rotate the disc.

- On the other hand, when vibration was applied for one minute using a piezoelectric material to an al-air RAD slider under similar conditions before the magnetic disk was rotated, the magnetic disk could be rotated smoothly.

〔Effect of the invention〕

As described above, according to the present invention, the rotating magnetic disk is in contact with the magnetic disk before rolling, and when the magnetic disk rotates, it moves in a floating state over the magnetic disk and records data.・Since it is equipped with a magnetic head that performs reproduction and a strain generating means that applies a strain force to the magnetic head before rotating the magnetic disk, the adsorption force between the magnetic disk slider and the magnetic disk that was attracted is weakened, and the magnetic disk Since the magnetic head slider can be rotated easily, a highly reliable magnetic disk device can be obtained in which the magnetic disk slider and the like will not be damaged.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a general magnetic disk device, and FIG. 2 is a partially enlarged configuration diagram of a magnetic head slig portion of a magnetic disk device according to a first embodiment of the present invention. (1) is a magnetic disk, (2) is a magnetic head slider,
(3) is the spindle, (4) is the actuator, (5)
is a filter, and (6) is a piezoelectric body. In the drawings, the same reference numerals indicate the same or equivalent parts.

Claims (2)

[Claims] (1) A rotating magnetic disk, which is in contact with the magnetic disk before the magnetic disk rotates, and when the magnetic disk rotates,
A magnetic disk device comprising: a magnetic head that moves in a floating state on the magnetic disk for recording/reproducing; and a strain generating means for applying a strain force to the magnetic head before rotation of the magnetic disk. (2) The magnetic disk device according to claim 1, wherein the strain generating means is a piezoelectric body provided on the magnetic head slider.