JPH01267838A - Production of recording medium - Google Patents

Abstract

PURPOSE:To easily form marks for identifying the medium without giving mechanical damages to the medium by forming the marks identifying the medium by using ink or resin material on the non-recording region on a disk substrate and forming a kind of thin film to said region, then removing the marking material and the thin film thereon. CONSTITUTION:The marks identifying the medium are formed by using the ink or resin material to the non-recording region 22 on the disk substrate 21. The thin film 24a of at least one kind among a metallic film, oxide film, nitride film, and carbide film is formed by a sputtering method or vacuum film forming method to the non-recording region on the disk substrate 21 after the marking. The marking material and the thin film 24a part thereon are removed and the marks for identifying the medium are formed on the traces after the marking material is removed. The identification marks of a recessed pattern type are thereby easily formed to the non-recording region 22 on the brittle disk substrate 21 consisting of glass, etc., without giving the mechanical damages thereto.

Description

[Detailed Description of the Invention] [Summary] A method for forming media identification marks on magnetic disks, which forms media identification marks without causing mechanical damage to brittle disk substrates such as glass or ceramics. For the purpose of film,
a step of forming a thin film of at least one of an oxide film, a nitride film, and a carbide film (for example, simultaneously formed with a material of a base film of a recording layer); and a step of removing the mark material and the thin film thereon. and a medium identification mark is formed on the removal trace of the mark material.

[Industrial Application Field] The present invention relates to a method for manufacturing a recording medium, and in particular, in the manufacturing process of a recording medium using a brittle disk substrate such as glass or ceramic, the present invention is capable of manufacturing a recording medium without mechanically damaging the surface of the substrate. The present invention relates to a method of forming an identification mark.

In the manufacture of magnetic recording media, optical recording media, magneto-optical recording media, etc., such recording media are provided with marks such as medium numbers or loft numbers for medium identification. In the case of using a brittle disk substrate made of .

[Conventional technology]

Conventionally, for example, aluminum was used as a base material and Ni was applied to the surface of the base material.
When providing a mark such as a medium number or loft number to identify the medium on a magnetic recording medium using a metal disk substrate subjected to P surface treatment or alumite surface treatment, as shown in Fig. 5. The metal disk substrate 11
Prior to forming a magnetic recording layer, etc., on the disk substrate 11, other than the magnetic recording layer formation area 12, the so-called non-magnetic recording area 13 is directly inscribed with a diamond marking pen or a laser beam marking method, for example. Identification marks such as 'A-1' are provided.

[Problem to be solved by the invention]

By the way, when an identification mark is directly marked on the non-magnetic LIc area 13 of the metal disk substrate as described above by using a diamond scriber or a laser beam engraving method, the identification mark may be Although there is no problem that the strength of the disk substrate 11 is reduced, if these disk substrates are brittle disk substrates such as glass or ceramic, the identification marks marked may damage or distort the disk substrate. As a result, the strength of the disk substrate is significantly reduced. Furthermore, there is a problem in that the probability that the disk substrate is easily destroyed increases.

In view of the above-mentioned conventional problems, the present invention has been developed to prevent mechanical damage to the non-magnetic recording area of the disk substrate in the manufacturing process of a recording medium using a critical disk substrate made of glass or ceramic. It is an object of the present invention to provide a novel method for manufacturing a recording medium in which a mark for medium identification is formed without any marking.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention uses a writing pen using ink on the non-recording area on the reverse side of a river fish disk base made of glass or ceramic, or a rubber stamp using ink or resin material. a step of forming a mark to identify the medium, and forming at least one of a metal film, an oxide film, a nitride film, and a carbide film on the non-recording area on the disk substrate after the marking by a sputtering method or a vacuum film forming method. A step of forming a kind of thin film and a step of removing the mark material such as ink or resin material and the thin film thereon are performed, and a mark for medium identification is formed on the mark material's removal mark.

[For production]

In forming the medium identification mark in the method of manufacturing a recording medium of the present invention, the medium identification mark is marked with a writing pen using ink, or by imprinting a rubber stamp using ink or resin material. After forming a thin film of at least one of a metal film, an oxide film, a nitride film, and a carbide film on a non-recording area on a brittle disk substrate by sputtering or the like, the identification mark material is dissolved with a solvent or the like. By removing the identification mark material, the thin film portion on the identification mark material is also removed at the same time. As a result, the identification mark is easily formed in the shape of a concave pattern on the thin film.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 4 are a perspective view and a partially enlarged plan view showing an embodiment of the recording medium manufacturing method according to the present invention in the order of steps in the case of manufacturing a perpendicular magnetic recording disk.

First, as shown in FIG. 1, "'A-1" is marked at a predetermined position in the non-magnetic recording area 22 on the surface-cleaned glass disk substrate 21 with an oil-based marker, and then dried. After that, as shown in FIG. 2, a Ni--Fe film is deposited to a thickness of, for example, 0.1 μm on the non-magnetic recording area 22 including the marking portion and the magnetic recording layer forming area 23 on the disk substrate 21 by sputtering or the like. A thin film 24a for forming an identification mark in the non-magnetic recording area 22 and a plating base film 24b for forming a soft magnetic underlayer in the magnetic recording layer forming area 23 are simultaneously formed.

Next, by dissolving and removing the mark material marked with "'A-1" using a solvent such as isopropyl alcohol or acetone, the thin film 24a on the mark material is also removed at the same time.

Therefore, as shown in FIG. 3, a concave pattern-shaped medium identification mark "'A-
1” is the non-magnetic recording area 22 on the disk substrate 21.
can be easily formed without mechanical damage.

Next, as shown in FIG. 4, a soft magnetic underlayer 25 made of Ni--Fe is formed by a plating method on the magnetic recording layer forming area 23 on which the plating underlayer 24b is formed on the disk substrate 21. Then, a magnetic recording layer 26 made of Co--Cr is deposited to a thickness of 0.15 μm by sputtering or the like.

In this way, it becomes possible to easily manufacture a perpendicular magnetic recording disk with a medium identification mark "A-1".

In addition, in the above embodiment, an example was explained in which the formation of an identification mark was incorporated into the medium forming process in the manufacture of a magnetic recording disk using a glass brittle disk substrate. The examples are not limited. That is, this identification mark can be formed in a separate process from the recording medium formation, and can also be applied to the manufacture of optical recording media or magneto-optical recording media using brittle disk substrates such as glass or ceramic. be.

In addition, in this example, a two-layer perpendicular magnetic recording layer is formed using a plating method and a sputtering method, but a similar perpendicular magnetic recording layer or a horizontal magnetic recording layer can also be formed using only a sputtering method. It can also be applied to a method of manufacturing a magnetic recording medium.

Furthermore, when marking the medium identification mark, the shape of the mark can be made uniform by using a rubber stamp or the like in addition to a Magic Ben. As the marking ink, an aqueous, oil-based, or resin-based ink that is easily dissolved in a solvent such as isopropyl alcohol or acetone may be used.

In addition, since the thin film portion deposited on the marked ink material has poor adhesion, it can also be removed by mechanically rubbing it.

[Effects of the Invention] As is clear from the above description, according to the method for manufacturing a recording medium according to the present invention, mechanical damage is not caused to the non-recording area on a brittle disk substrate such as glass during the manufacturing process. It becomes possible to easily form an identification mark in the form of a concave pattern, and it has excellent practical effects, such as significantly improving process control and recording medium reliability.

[Brief explanation of the drawing]

FIGS. 1 to 4 are perspective views and partial views showing one embodiment of the method for manufacturing a recording medium and the method for forming a medium identification mark according to the present invention in the order of steps in an example in which a method for manufacturing a perpendicular magnetic recording disk is applied. FIG. 5 is an enlarged plan view and a perspective view for explaining a method of forming a mark for medium identification on a conventional magnetic recording medium. In FIGS. 1 to 4, 21 is a glass disk substrate, 22 is a non-magnetic recording area,
23 is a magnetic recording layer forming area, 24a is a thin film for forming an identification mark, 24b is a plating base film, 25 is a soft magnetic underlayer,
26 is a magnetic recording layer, and A-1 is a medium identification mark. This invention 1 do 1 υ j j 37-7/n-ki'7=Iji figure 1 Δ migan tsu 8 fatty part go 7-7 ga 5 pa\Ffl jiao qF2 dani'
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figure

Claims (2)

[Claims] (1) When forming a magnetic recording layer on a brittle disk substrate (21) such as glass or ceramic,
a step of forming a mark for identifying the medium using ink or a resin material in the non-recording area (22) on the disk substrate; sputtering on the non-recording area (22) on the disk substrate (21) after the marking; Alternatively, a step of forming at least one kind of thin film (24a) among a metal film, an oxide film, a nitride film, and a carbide film by a vacuum film forming method, and removing the mark material and the thin film (24a) portion thereon. 1. A method for manufacturing a recording medium, the method comprising: performing a process to form a medium identification mark on the removal trace of the mark material. (2) The thin film (24a) is an underlayer film (24a) for the magnetic recording layer.
4. The method of manufacturing a recording medium according to claim 1, wherein the recording medium is simultaneously formed of the material of item 4b).