JPS628332A - Cleaning method for magnetic recording medium - Google Patents

Abstract

PURPOSE:To remove strongly a magnetic substance having a strong adhesive strength such as a magnetic substance in a hole not only a magnetic substance existing a weak adhesive strength on the surface by mounting >=2 electromagnets to a head or a fixed arm, using one electron magnet so as to shake a remaining magnetic substance and using the other so as to attract the magnetic substance. CONSTITUTION:A disc is cleaned by scanning an arm 6 in radial direction of the disc 8 during rotation. The magnetic cores 3, 4 fixed to the arm 6 are in contact with the disc 8 with a minimized gap from the disc 8 without giving damage to the disc 8. Then a coil 6 to which a pulsating current flows and the magnetic core 3 are provided, e.g. to the front of the rotation of the disc 8 and a coil 2 to which a constant current flows and magnetic core 4 are provided to the rear side of the rotation of the disc 8. The remaining magnetic substance 10 of the magnetic film 9 opposed to the magnetic core 3 is shaken slightly as shown in arrow by the vibration of the magnetic field generated from the magnetic core 3. Then the remaining magnetic substance 10 is attracted by the magnetic core 4 by a strong magnetic field at a position opposed to the magnetic core 4. As a result, the magnetic film is cleaned.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for manufacturing a magnetic recording medium, and particularly to a cleaning method using an electromagnet suitable for removing magnetic residue from the surface of the medium and the hole portions. .

[Background of the invention]

The conventional manufacturing method of magnetic recording media is disclosed in Japanese Patent Application Laid-Open No. 56-7182.
In the burnishing process, as described in No. 8, @Kokai No. 56-29874, protrusions and dust on the surface of the medium are cut and removed by scanning the surface of the medium with a similar head. However, no consideration was given to removing burnishing residues and dust remaining on the surface of the medium and in the holes of the medium.

[Object of the Invention] The object of the present invention is to provide a method for cleaning a magnetic recording medium, which removes magnetic residues from the surface and holes of the magnetic recording medium, such as residues from finishing or burnishing 1, by attracting them using magnetic force. It's about doing.

[Summary of the invention]

Unwanted magnetic residue and dust remaining on magnetic recording media are removed by considering that the primary component of the media is ferromagnetic material.
Equipped with two or more electromagnets on the head or fixed arm,
By shaking the remaining magnetic material on the one hand and attracting it on the other hand, it is possible to remove not only the magnetic material that exists with weak adhesion on the surface but also
Powerfully removes magnetic objects with strong adhesion, such as those inside holes.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. FIG. 1 shows a head slider 5 with coils 1, 2. magnetic core 6
, a cleaning mechanism equipped with two sets of electromagnets consisting of 6 (2)
is a side sectional view, and IA) is a front sectional view. FIG. 2 shows a cleaning mechanism in which an electromagnet is mounted on the arm 6, and (4) is a side sectional view, and fA) is a front sectional view. The number of electromagnets may be three or more as necessary. In the case of Fig. 1, the magnetic cores 6 and 4 are installed with a gap α from the bottom of the head slider 5.
The support spring 7 causes the head slider 5 to follow the vertical movement of the traveling magnetic recording medium, so that the magnetic recording medium and the magnetic core 5
, 4 can be kept small and constant. On the other hand, in the case of FIG. 2, the magnetic core 5.4 is fixed in the vertical direction together with the arm 6 and does not move. Therefore, in order to avoid contact when the magnetic recording medium moves up and down, the gap between the magnetic cores 5, 4 and the magnetic recording medium is It is larger than that of a head slider. But coil 1,
The dimensions and assembly method of the magnetic cores 2 and the magnetic cores 3 and 4 are less restricted than in the case of a head slider, and can be easily designed.

For the magnetic cores 6 and 4, a magnetic material with high magnetic permeability and low coercive force is selected.

Section 6 is a diagram showing a method of cleaning a magnetic disk medium (hereinafter referred to as a disk) when the arm shown in FIG. 2 is used, in which (eL) is a plan view and (b) is a front view. In addition to disks, the present invention can also be applied to magnetic tapes, etc., as the medium.

FIG. 4 shows the waveform of the current flowing through the coils 1 and 2, and FIG. 5 shows the state of the magnetic film 9 and magnetic residue 10 of the disk 8 facing the magnetic cores 3 and 4.

The cleaning of the disc is carried out by scanning the arm 6 in the radial direction of the rotating disc 8. The magnetic cores 3 and 4 fixed to the arm 6 are set so that they do not come into contact with the disk 8 and damage it, and the gap between them and the disk 8 is minimized. In this embodiment, the coil 1 and the magnetic core 3 that flow an oscillating current are provided in front of the rotation of the disk 8, and the coil 2 and the magnetic core 4 that flow a constant current are provided in the rear of the rotation of the disk 8, but this positional relationship is Not specific to the example. At this time, the control unit causes the coils 1 and 2 to receive an oscillating current whose direction is changed at a constant period, as shown in FIG.
A constant current is passed through coil 2. The rotational speed of the disk 8, the scanning speed of the arm 6, and the oscillating current cycle of the coil 1 are determined by the size and shape of the magnetic residue 10 to be cleaned.

Select by considering the magnitude of the magnetic moment. As shown in FIG. 5, magnetic remnants 10 of the magnetic film 9 facing the magnetic core 5
For example, due to the vibration of the magnetic field generated from the magnetic core 6, it swings slightly as shown by the arrow. Next, the magnetic residue 10 is attracted to the magnetic core 4 by a strong magnetic field at a position facing the magnetic core 4 .

As a result, the magnetic film 9 is cleaned.

After cleaning the disk 8, the arm 6 is cleaned.

The arm 6 is retracted from the disk 8, and as shown in FIG. 4, the current in the coil 1.2 is reduced to zero, either mechanically using cleaning paper (not shown) or magnetically using another magnet.
The magnetic residue 10 collected on the magnetic cores 3 and 4 is removed.

According to this embodiment, there is an effect that the magnetic residue 10 on the disk 8 can be continuously and efficiently cleaned.

〔Effect of the invention〕

According to the present invention, two pairs of electromagnets give motion to and attract the residual magnetic material of the magnetic recording medium, so that the following effects can be achieved.

(1) It is possible to clean not only the magnetic substances on the surface of the medium but also the magnetic substances in the holes of the medium.

(2) *By changing the value of the current flowing through the magnet, the number of turns of the electromagnet, the shape of the magnetic core, etc., you can easily select the appropriate momentum and suction force to achieve optimal cleaning.

(6) Magnetic substances attached to the magnetic core of the head or arm can be easily removed by suction, and the next magnetic recording medium can be cleaned again.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a cleaning mechanism in which an electromagnet is mounted on a head slider according to an embodiment of the present invention, where Ha) is a side sectional view, (b) is a front sectional view, and Fig. 2 is an arm according to another embodiment. 6 is a diagram showing a cleaning mechanism equipped with an electromagnet, %+a) is a side sectional view, (b) is a front sectional view, FIG. 6 is a diagram for explaining the method of cleaning a magnetic disk, and (a) is a plan view. , +
b) is a front view, Figure 4 is a waveform diagram of the current applied to the stone,
FIG. 5 is a diagram for explaining the process of cleaning magnetic residue on the surface of a recording medium. 1.2...Coil 6,4...Magnetic core 5...
Head, slider 6...arm 7...support spring 81.・Magnetic disk media

Claims (1)

[Claims] Two or more sets of electromagnets are mounted on the head slider or arm, an oscillating current is passed through at least one set of electromagnets, and a direct current is passed through at least one set of electromagnets, and the magnetic field induced by the electromagnets is applied to a magnetic recording medium. A method for cleaning a magnetic recording medium, which comprises removing magnetic residues attached to the magnetic recording medium by applying an action to the magnetic recording medium.