JPH0673182B2 - Lubricant application method to magnetic disk - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for applying a lubricant to a magnetic disk suitable for uniformly applying a lubricant to the surface of the magnetic disk.

[Prior Art] A lubricant film is formed on the surface of a magnetic disk. As a coating method, a spraying method in which a lubricant is sprayed on the surface or a magnetic disk is immersed in a lubricant solution tank. The dipping method of pulling up has been conventionally used. The former conventional technique is disclosed in JP-A-56-22222.

[Problems to be Solved by the Invention] The technique disclosed in Japanese Patent Application Laid-Open No. 56-22222 is such that while a magnetic disk is rotated, a certain amount of a lubricant is sprayed onto the surface in synchronization with this rotation. However, the method is different from that of the present invention.

A conventional technique of the same dip method as the present invention will be described with reference to FIGS. The disk-shaped magnetic disk 1 is held vertically by contacting the outer circumference with a support base 4 arranged on the same circumference on the magazine 3. For details, as shown in FIG.
A V groove is formed on the support base 4, and the magnetic disk 1 is held in a state where the outer peripheral corner portion is in contact with the inclined surface of the V groove. Although FIG. 4 shows the case where two magnetic disks 1 are held, the present invention is not limited to this. Lubricant tank 2
A solution 5 in which a lubricant and a solvent are mixed is stored inside.
The magnetic disk 1 held as described above is vertically immersed in the lubricant tank 2 and then slowly pulled up to form a lubricant film having a uniform thickness on the surface of the magnetic disk 1. The solvent diffuses when it is pulled up.
However, the corner portion of the magnetic disk 1 and the V
Since a relatively narrow triangular crossing portion is formed between the inclined surfaces of the groove, a lubricant pool 6 is formed at the crossing portion when the magnetic disk 1 is pulled up. As shown in FIG. 5, the pool 6 diffuses over the outer peripheral surface of the magnetic disk 1 with the passage of time to form a diffusion portion 7. In the diffusion portion 7, the thickness of the lubricant becomes thicker than the other portions, and uniform coating cannot be obtained.

When a signal is stored in the magnetic disk 1 by a magnetic head (not shown), the two are made to be close to each other with a minute gap, but as described above, when the lubricant film is nonuniform, the film is thick. The diffusion part 7 is attracted to the magnetic head side, which causes a problem that the magnetic disk device is not activated.

The present invention solves the above problems, and an object of the present invention is to provide a method for applying a lubricant to a magnetic disk by eliminating the lump 6 and forming a lubricant coating of uniform thickness on the surface of the magnetic disk. To do.

[Means for Solving the Problems] The above problems are solved by forming the contact portion between the support for holding the outer periphery of the magnetic disk and the magnetic disk from an oil-absorbing material. .

[Operation] The lubricant accumulated between the corner portion of the outer circumference of the magnetic disk and the inclined surface of the support base 2 is absorbed by the member made of an oil-absorbing material when the magnetic disk is pulled up, and therefore the above-mentioned diffusion portion does not occur .

[Embodiment] An embodiment suitable for carrying out the method of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the support base 4 is formed with a V groove for contacting the corner portion of the magnetic disk 1. In this embodiment, the support base 4 is formed along the V groove on the contact portion side. The oil absorbing member 8 is fixed. The oil-absorbing member 8 is made of a material capable of absorbing a lubricant, such as Japanese paper, filter paper,
Porous metal, porous porcelain, glass fiber paper, braided wire,
Wire ropes and the like can be raised, but of course the invention is not limited to these.

By providing the oil absorbing member 8 as described above, the magnetic disk 1 is held on the support base 4 via the oil absorbing member 8.

Next, the operation of this embodiment will be described in more detail.

The magnetic disk 1 held on the support 4 via the oil-absorbing member 8 is immersed in the lubricant tank 2 in the same state as that shown in FIG. 3, and then pulled up to form a lubricant film. I do.

FIG. 2 shows the oil-absorptive member 8 in the film forming process as described above.
The change in the oil absorption capacity of the oil absorption member 8 is shown on the abscissa, and the oil absorption capacity of the oil absorbing member 8 is shown on the ordinate.

In the state before the magnetic disk 1 is immersed, that is, in the initial state (shown by A), the oil absorbing member 8 does not absorb the solution at all, and therefore the oil absorbing ability is 100%.
Next, when the magnetic disk 1 is immersed in the lubricant tank 2 (indicated by B), the solution is sucked into the oil absorbing member 8, so that the oil absorbing capacity becomes 0%. The solution is formed by mixing the lubricant and the solvent as described above. Next, when the magnetic disk 1 is slowly pulled up from the lubricant tank 2 (indicated by C), the solvent sucked into the oil absorbing member 8 evaporates, so that the oil absorbing ability of the oil absorbing member 8 recovers rapidly, Return to 100%. A pool 6 is formed at the contact portion between the corner portion of the magnetic disk 1 and the oil absorbing member 8 as in the case of the conventional technique, but this pool 6 is not absorbed by the oil absorbing member 8 in the C state. Therefore, the oil absorbing ability of the oil absorbing member 8 is slightly lowered (shown in D). Since the pool 6 is sucked into the oil absorbing member 8 as described above, the diffusion portion 7 (FIG. 5) as in the prior art does not emit light at all. As shown in FIG. 2, the oil-absorbent member 8 is maintained in the state where the oil-absorption capacity is close to 100% in the next work waiting state (shown by F), and the same steps as above are repeated.

In this embodiment, the oil-absorbent member 8 fixed to the support base 4 is adopted, but the present invention is not limited to this, and the contact portion between the magnetic disk 1 and the support base 4 may be made of an oil-absorbent material. For example, the entire support base may be made of an oil absorbing material.

[Effects of the Invention] As is apparent from the above description, according to the present invention, the effect that the lubricant film on the surface of the magnetic disk can be formed to have a uniform thickness and the attraction to the magnetic head can be completely prevented is enhanced.

[Brief description of drawings]

FIG. 1 is a partial sectional view of an embodiment of the present invention, FIG. 2 is a diagram for explaining the operation of the embodiment, and FIG. 3 is an explanatory plan view for explaining a magnetic disk coating method. FIG. 4 is a partial side view showing an engaged state of a conventional magnetic disk and a support for holding the magnetic disk, and FIG. 5 is a plan view showing a diffusion portion of a lubricant generated on the surface of the conventional magnetic disk. 1 ... Magnetic disk, 2 ... Lubricant tank, 3 ... Magazine, 4 ... Support stand, 5 ... Solution, 6 ... Pool, 7 ...
Diffusion part, 8 ... Oil absorbing member.

Claims (1)

[Claims] 1. A method for applying a lubricant to a magnetic disk, wherein the outer periphery of a disk-shaped magnetic disk is held by a support, the whole is immersed in a lubricant solution, and a lubricant is applied to the surface of the magnetic disk. A method for applying a lubricant to a magnetic disk, characterized in that the contact portion between the magnetic disk and the support is formed of a material having an oil absorbing property.