JPH0430380A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To effectively remove dust stuck on the whole magnetic disk surface by controlling the working speed of a magnetic disk so that the magnetic disk may rotate more than once while a cleaning head moves for the distance of floating face slider width. CONSTITUTION:When a magnetic disk 3 reaches normal rotation, a cleaning head positioner 4 starts moving toward the inner peripheral side of the magnetic disk 3. Floating clearance h2 of a cleaning head 1 is smaller than floating clearance H2 of a magnetic recording and reproducing head 2 and moving speed v(m/s) of the cleaning head positioner 4 is controlled by a cleaning head positioner controller so as to satisfy the relation of v<NXl with the floating face slider width of the cleaning head 1 as l(m) and with the rotation frequency of the magnetic disk 3 as N(rps).

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a magnetic disk device having a floating magnetic head, and particularly to a magnetic disk device that removes dust from the surface of a disk.

[Background Art] Recent years have seen remarkable progress in increasing the recording density of magnetic disk devices. Behind this progress toward higher recording densities is an increase in the coercive force of magnetic disks and a reduction in the flying height of magnetic heads, and recently, flying heights of less than 0.2 um have even been achieved. Due to this progress in lowering the flying height, dust contained in the device and generated dust adheres to the surface of the magnetic disk, interfering with the mutual movement of the magnetic recording/reproducing head and the magnetic disk, and indirectly causing the magnetic recording/reproducing head and the magnetic When the disks come into contact with each other, the magnetic recording/reproducing head and the magnetic disk are damaged (problems such as so-called head crashes occur).

Enclosed dust and generated dust attached to these magnetic disks are
It needs to be removed after the magnetic disk device is assembled, and conventionally, the
, Japanese Patent Laid-Open No. 58-111164, dust removal was performed using a magnetic recording/reproducing head.

[Problems to be Solved by the Invention] In the conventional technology described above, the magnetic recording/reproducing head was used to remove dust attached to the surface of the magnetic disk, so if the magnetic recording/reproducing head positioner did not operate, the magnetic recording/reproducing head However, because the magnetic recording/reproducing head does not move on the magnetic disk and cannot scan the entire surface of the magnetic disk, there are areas on the FFI disk where dust adheres and accumulates, and these areas can cause head crashes. could have occurred.

An object of the present invention is to continuously and effectively remove adhering dust on the entire surface of a magnetic disk while the magnetic disk is rotating, thereby preventing head crashes.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, a dedicated cleaning head, a cleaning head positioner, and a cleaning head positioner control device are provided separately from the magnetic recording/reproducing head. It is something. Furthermore, in order to effectively remove attached dust, the flying clearance of the cleaning throat is made smaller than the flying clearance of the magnetic recording/reproducing head, and the cleaning head positioner is set at a distance corresponding to the width of the cleaning head's flying surface slider. While the magnetic disk is moving, the magnetic disk rotates one or more revolutions, and the cleaning head positioner continuously performs an operation of reciprocating between the inner and outer circumferences of the magnetic disk while the magnetic disk is rotating. Cleaning is controlled by a throat positioner control device.

[Function] It has a dedicated cleaning throat separate from the 6n recording/reproducing head, the flying clearance of the cleaning head is smaller than that of the magnetic recording/reproducing head, and the cleaning head is controlled by the cleaning head positioner.
Since the magnetic disk is moved a distance equal to the width of the air bearing surface slider of the cleaning head during one or more revolutions, dust on the magnetic disk is effectively removed and head crashes are prevented.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a magnetic disk device showing an embodiment of the present invention, and FIG. 2 shows the relationship between the flying clearance of the cleaning head 1 and the magnetic recording/reproducing head 2 and the dust 6 attached to the magnetic disk 3. The conceptual diagram shown in FIG. 3 is an upper view showing the arrangement of the cleaning head 1.

Hereinafter, a description will be given of a magnetic disk device in which the position of the cleaning head l is on the outer periphery of the magnetic disk 3 immediately after the magnetic disk 3 reaches steady rotation. The magnetic recording/reproducing head 2 is positioned at a predetermined track on the magnetic disk 3 by a magnetic recording/reproducing head positioner 5 and a magnetic recording/reproducing head positioner control device (not shown). When the magnetic disk 3 reaches steady rotation, the cleaning head positioner 4 begins to move toward the inner circumferential side of the magnetic disk 3. As shown in FIG. 2, the flying clearance h2 of the cleaning head 1 is smaller than the upper clearance of the two magnetic recording/reproducing heads 2 (and the moving speed of the cleaning head positioner 4 v [m/sl The width of the air bearing surface slider of the cleaning head l is 12 [m], and the number of rotations of the magnetic disk 3 is N [
rpsl, so as to satisfy the relationship V〈Nxff,
Cleaning head positioner control device (not shown)
controlled by As a control means, a stepping motor, a voice coil motor using a control signal of a magnetic recording/reproducing head, etc. may be used. When the cleaning head 1 crosses the innermost periphery of the recording/reproducing area of the magnetic disk 3, the moving direction of the cleaning head positioner 4 is reversed, and the cleaning head moves from the inner periphery to the outer periphery. This reciprocating motion is performed continuously while the magnetic disk is rotating, and the dust attached to the magnetic disk is removed.
removed.

From the viewpoint of dust removal, the cleaning head 1 has M! The cleaning head 1 is preferably provided upstream of the recording/reproducing head 2, and the cleaning head 1 is preferably provided with a yaw angle.

In order to remove the attached dust even more effectively, a hole slider having holes in the air bearing surface of the slider as disclosed in Japanese Unexamined Patent Publication No. 63-225982 may be used as the cleaning head.

[Effects of the Invention] As explained above, the present invention has a cleaning head with a lower flying clearance than the magnetic recording/reproducing head, a cleaning head positioner, and a cleaning head positioner control device, which are separate from the magnetic recording/reproducing head system,
The cleaning head continuously reciprocates on the magnetic disk, and while the cleaning head moves a distance equal to the width of the air bearing surface slider, the magnetic disk rotates more than once (the speed of its operation is controlled, so the magnetic disk This has the effect of effectively removing dust on all surfaces.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a magnetic disk device showing an embodiment of the present invention, and the second section shows a cleaning head and a magnetic recording head.
FIG. 3 is a conceptual diagram showing the relationship between the flying clearance of the reproducing head and the dust attached to the magnetic disk. FIG. 3 is a top view showing the arrangement of the cleaning head. 1--Cleaning head, 2--Magnetic recording/reproducing head, 3--Gn disk,
4...-Cleaning head positioner-25.
...Magnetic recording/playback head positioner

Claims (1)

[Claims] 1. A plurality of stacked magnetic disks, a plurality of magnetic recording/reproducing heads floating above the rotating magnetic disks, and a magnetic recording/reproducing device for positioning the magnetic recording/reproducing heads to predetermined tracks on the magnetic disks. In a magnetic disk device having a reproducing head positioner and a magnetic recording/reproducing head positioner control device, the magnetic recording/reproducing head flies above the surface of the magnetic disk and has a flying clearance smaller than that of the magnetic recording/reproducing head. A magnetic disk device comprising the same cleaning head, a cleaning head positioner, and a cleaning head positioner control device that repeatedly reciprocates the cleaning head at a constant speed between an inner periphery and an outer periphery on the magnetic disk.