JPS61260484A - Magnetic head floating device in magnetic disk device - Google Patents

Abstract

PURPOSE:To prolong the service life of a device by adjusting the static mode of the supprting body of a slider and approaching a magnetic head to a magnetic disk by a window pressure generated on the upper surface of the slider during the rotation of the magnetic disk. CONSTITUTION:When the magnetic disk is not rotated, the slider 6 is held separated from the magnetic disk 2 in the initial state where a flat spring 7 is fitted to the prescribed arm. When the mangetic disk 2 rotates, the air in the vicinity of the magnetic disk is stirred to form the air flow as shown by an arrow. Said flow turns out the wind pressure which flows along the taper 6A of the slider 6 and presses the disk downward, and therefore the slider 6 is pressed to the side of the magnetic disk 2 to sink the slider 6. Then a distance between the magnetic head 3 and the magnetic disk 2 is reduced, thereby making it possible to record and reproduce the magnetic disk 2.

Description

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

[Conventional technology]

FIG. 7 is a perspective view schematically showing a magnetic head and its support structure in a conventional magnetic disk device described in, for example, Journal of the Japan Society of Mechanical Engineers, Vol. 87, No. 791, Page 1165.

In this figure, (1) is a hub, (2) is a magnetic disk fixed to this hub, (3) is a magnetic head that records or reproduces signals on the magnetic disk, and (4)
is a slider that supports this magnetic head, and (5) is a plate serving as a support that supports this slider, so that when the magnetic disk is stopped, the slider (4) is in contact with the magnetic disk. This applies a pressing force to the Therefore, when the magnetic disk (2) is not rotating,
The slider (4) is magnetically in contact with the disk (2) as shown in Figure 8, and when the magnetic disk (2) begins to rotate together with the hub (1), the magnetic disk (2) and the slider (2) ) will start to slip when they are in contact with each other. Then, the magnetic disk (2) rotates at the rated speed, for example, 3600 (rp).
m), the slider (
4) floats up from the magnetic disk (2). This is because air (A) flows in from the tapered part (4A) of the slider (4) as shown by the dotted arrow, forming a minute air film layer between the magnetic disk (2) and the slider (4). This is due to The minimum dimension between the slider (4) and the magnetic disk (2) or between the magnetic head (3) and the magnetic disk (2) is said to be approximately 0.2 to 0.4 micrometers. In this state, while the magnetic disk (2) is rotating, the magnetic head (3) can take out the magnetization signal recorded on the magnetic disk (2), and vice versa. It is possible to write signals to the disk (2).

[Problem that the invention seeks to solve]

Conventional magnetic disk drives have the above configuration, and the slider (4) and magnetic disk (2) are in contact not only when the magnetic disk starts rotating, but also when the magnetic disk stops. This may damage the bottom surface of the slider (4) or the surface of the magnetic disk, or dirt that was not a problem when the slider (4) was floating may infiltrate the contact surface, causing new dirt to be generated. If the contact surface is damaged or dust is generated, the magnetic film on the surface of the magnetic disk (2) may peel off, and the floating state of the slider (4) may become unstable.The recording and reproducing characteristics of the magnetic head (3) may occur. There was a problem of deterioration.

This invention was made to solve these problems and extend the life of the magnetic disk drive.The invention prevents contact between the magnetic disk and the slider when the magnetic disk (2) is started or stopped, so that the magnetic disk (2) does not come into contact with the slider. is also set to a remote state,
The present invention aims to provide a device that provides a magnetic head flying height equivalent to that of the conventional device under rated operating conditions.

[Means and effects for solving the problem] The magnetic disk drive according to the present invention adjusts the static form of the slider support so that the slider can be set in a state separated from the magnetic disk when the magnetic disk is not rotating. At the same time, the magnetic head is brought closer to the magnetic disk by the wind pressure generated on the upper surface of the slider while the magnetic disk is rotating.

[Embodiments of the invention]

An embodiment of the present invention shown in FIGS. 1 and 2 will be described below. In these figures, (6) is a slider, and a taper (6A) is formed on the surface not facing the magnetic disk (2), that is, the upper surface in the figures.

This taber (6A) is connected to the direction of rotation of the magnetic disk (2) (
It is formed as a taber with an upward slope along the solid line arrow in FIG. (3) is a magnetic head attached to the rear end of the slider (6), and (7) is a plate that serves as a supporting body for the slider (6), and has a vertical section (7A) in a cross-section shape. The vertical portion (7A) is located on the thicker portion side. Furthermore, as shown in FIG. 1, when the magnetic disk (2) does not rotate, the force of the leaf spring
The shape is such that the slider (6) is kept sufficiently separated from the magnetic disk (2). In this sufficiently separated state, the magnetic head (3) cannot reproduce the signal from the magnetic disk (2).

Other configurations are not shown because they are similar to conventional ones. In such a configuration, when the magnetic disk is not rotating, the slider (6) is in the initial state where the plate spring (7) is attached to a predetermined arm (not shown).
As shown in the figure, it is held apart from the magnetic disk (2).

When the magnetic disk (2) rotates, the air in the vicinity of the magnetic disk is agitated, creating an air flow as shown by the dotted arrow in FIG. This is the slider (6) Taber (
When flowing along the magnetic disk (6A), the wind pressure presses the taber (aA) downward, so the slider (6) moves along the magnetic disk (
2), the slider (6) sinks from the state shown in Figure 1 to the state shown in Figure 2, and as a result, the distance between the magnetic head (3) and the magnetic disk (2) is reduced. It is possible to record on and reproduce data from the magnetic disk (2).

In the above embodiment, a case was explained in which the vertical part (7A) of the plate spring (7) having an angular cross-section is located on the side opposite to the incidence of air, but as shown in FIG. may be located on the air incidence side. Taber (6A) on the top surface
) in the slider (6), the wind pressure is usually high on the air incidence side, so the mounting end of the magnetic head (3) on the opposite side of the air incidence side is usually connected to the magnetic disk (2).
) tend to move away from

However, as shown in Figure 3, if the vertical part (7A) is located on the air incidence side, the center of the thin screw rigidity of the leaf spring (7) will be biased to a position close to the vertical part (7A). )
can be prevented from lifting. Furthermore, as shown in FIG. 4, even if a small taper (6B) is formed on the magnetic disk side at the tip of the slider (6), lifting of the magnetic head (3) can be similarly prevented. is possible.

In addition, in the above embodiment, since the suppression applied to the slider (6) is small compared to the conventional device, the slider (6)
) and the magnetic disk (2) tends to become a little larger, but as shown in FIG. By forming the curved portion (6C) that curves in the radial direction of (2), the wind pressure on the slider (6) can be increased, and the magnetic head (3) and the magnetic disk (
2) can reduce the gap between the two. Further, according to this invention, since the slider is always separated from the magnetic disk, if an external shock is applied to the magnetic disk device while the magnetic disk is stopped, the leaf spring swings, causing the slider and the magnetic disk to move. There is a possibility that the plates collide, damaging both sides and scattering minute pieces of both materials, but as shown in Figure 6, the splitting material (8)
Collisions can be prevented or suppressed by attaching stickers. As a result, it is possible to prevent minute pieces of material from scattering, and there is no problem in recording and reproducing signals between the magnetic head (3) and the magnetic disk (2).

〔Effect of the invention〕

The present invention is constructed as described above, and the slider and magnetic head are kept separated from the magnetic disk even when the magnetic disk is stopped, so that the facing surfaces of the magnetic disk, slider, and magnetic head are prevented from being damaged. It is possible to perform highly reliable recording and reproduction over a long period of time.

[Brief explanation of drawings]

1 and 2 are schematic diagrams showing one embodiment of the present invention, with FIG. 1 showing the state when the magnetic disk is not rotating, and FIG. 2 showing the state when the magnetic disk is rotating. 3 to 5 are schematic diagrams of a magnetic head rotary shaft showing other embodiments of the present invention, FIG. 6 is a schematic diagram of a leaf spring showing still another embodiment of the present invention, and FIG. A perspective view showing the configuration of a conventional device, and FIGS. 8 and 9 show the state around the magnetic head in the conventional device. FIG. 8 shows the magnetic disk when it is not rotating, and FIG. be. In the figure, (1) is the hub, (2) is the magnetic disk, (3) is the magnetic head, +41, (6) is the slider, (5) is the plate, (6A) is the taper, and (7) is the L shape. shaped leaf spring, (
7A) is a vertical portion, (6B) is a small taper, (6C) is a curved portion, and (8) is a damping material. Note that the same reference numerals indicate the same or corresponding parts. Agent: Masuo Oiwa, Patent Attorney Figure 1 Figure 3 Figure 4

Claims (8)

[Claims] (1) A slider equipped with a magnetic head that records signals on a magnetic disk or reproduces signals recorded on a magnetic disk, and supports this slider, and when the magnetic disk is stopped, the magnetic head The slider is held apart from the magnetic disk so that the signal on the magnetic disk cannot be reproduced, and while the magnetic disk is rotating, the signal recorded on the magnetic disk by the magnetic head is reproduced. 1. A magnetic head floating device in a magnetic disk device, comprising a support body that allows the slider to approach the magnetic disk so as to obtain the slider. (2) A magnetic head floating device in a magnetic disk drive according to claim 1, wherein the support body is a spring body. (3) A magnetic head floating device in a magnetic disk drive according to claim 1 or 2, characterized in that a taper is formed on the anti-magnetic disk side of the slider. (4) A magnetic head floating device in a magnetic disk drive according to claim 3, wherein the taper has an upward slope along the rotational direction of the magnetic disk. (5) A magnetic head floating device in a magnetic disk drive according to any one of claims 2 to 4, wherein the spring body is formed to have an L-shaped cross section. (6) Magnetism in a magnetic disk device according to claim 5, characterized in that the spring body having an L-shaped cross section is disposed such that its vertical portion is located on the thinner side of the tapered surface of the slider. Head floating device. (7) A magnetic head in a magnetic disk device according to any one of claims 2 to 4, characterized in that a taper is formed at the tip of the slider on the side facing the magnetic disk. floating device. (8) The magnetic disk device according to any one of claims 3 to 5 or claim 7, wherein a concave surface curved in the radial direction of the magnetic disk is formed on the tapered surface of the slider. magnetic head floating device.