JP2009223948A - Surface treatment method and surface treatment device of magnetic recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently remove dust adhering to both surfaces of a magnetic recording medium having high cleanness, and to provide a treatment method of preventing re-adhesion of dust. <P>SOLUTION: In a first method, when at least matters adhering on the surfaces of a magnetic recording medium are collected using an adhesive tape, the magnetic recording medium is interposed between a plurality of rolls in contact with the magnetic recording medium via the adhesive tape, the adhesive tape is run by rotating the rolls, the magnetic recording medium is moved to the rolls or the rolls are moved along the surfaces of the magnetic recording medium to collect at least the matters adhering on the surfaces of the magnetic recording medium by the adhesive tape. In a second method, when at least the matters adhering on the surfaces of the magnetic recording medium are collected using the magnetic tape, the magnetic recording medium is rotated around its central aperture part and the rolls are brought into contact with the surfaces of the rotated magnetic recording medium via the adhesive tape to collect at least the matters adhering on the surfaces of the magnetic recording medium by the adhesive tape. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a surface treatment method and a surface treatment apparatus for a magnetic recording medium used in information equipment such as a hard disk drive.

A magnetic recording medium used as a hard disk drive is made of aluminum alloy or glass, and a donut-shaped disk-shaped substrate having a through hole in the center is subjected to a grinding process, a polishing process, a plating process, a cleaning process, and a drying process. Thereafter, a magnetic layer or the like is formed, the surface is burnished to remove minute dust adhering to the surface, and the surface is smoothed and manufactured through an inspection process. In addition, before or after the burnishing process, a step of applying a lubricant to the surface of the magnetic recording medium is provided, and a substrate cleaning and drying process may be provided between the above-described steps.
In recent years, the recording density of magnetic recording media has been increasing due to the demand for larger recording media and smaller information equipment, etc., and with respect to such magnetic recording media, the head can be lowered on the magnetic recording surface. A high level of flatness is required, and in order to remove dust adhering in various surface treatment processes such as polishing, the magnetic recording medium or the substrate for the medium is cleaned, and the cleaned magnetic recording medium is cleaned. Therefore, there is a need for a drying apparatus for drying. That is, it is necessary to separate the magnetic recording medium and dust adhering to the substrate from the surface using a high-performance cleaning device, and to surely spray the cleaning liquid containing the separated dust and the like from the surface.

For cleaning means such as a magnetic recording medium, there are a wiping method using a non-woven fabric, ionized air blowing, cleaning by suction, etc. in addition to a wet method using such a cleaning liquid. However, it is difficult to remove dust adhering in the process of forming a magnetic film by vapor deposition, sputtering, etc., and it may be difficult to remove it only by wet cleaning. In addition, since cleaning by a wet method requires an advanced drying technique, if the drying technique is insufficient, the magnetic recording medium may be soiled. Further, the method using wiping also has a problem such as dust generation from the wiping cloth.
In order to solve such problems, it has been disclosed to remove deposits such as dust attached to a magnetic recording medium such as a magnetic tape with an adhesive rotating roll (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 08-150361

  Although the dust removal method using the adhesive rotating roll described in Patent Document 1 is effective for a magnetic recording medium with a relatively low cleanness such as a magnetic tape, it is suitable for a magnetic recording medium with a high cleanness such as a hard disk drive. On the other hand, it was difficult to apply. In addition, the magnetic recording medium used for a hard disk drive or the like has a disk shape, and since both sides thereof are used, it is difficult to efficiently remove dust adhering to both sides of these magnetic recording media. Further, there has been a demand for a processing method that can realize higher dust removal efficiency and does not reattach dust compared to the method described in Patent Document 1. It is an object of the present invention to solve these problems.

As a result of diligent efforts to solve the above-mentioned problems, the present inventor uses an adhesive tape that continuously supplies deposits on the surface of a magnetic recording medium used in a hard disk drive or the like to both surfaces of the magnetic recording medium. As a result of the collection, it has been found that dust can be removed with high efficiency, and that dust can be prevented from reattaching to the magnetic recording medium, and the present invention has been completed. That is, the present invention provides the following surface treatment method and apparatus.
(1) A method of treating the surface of a magnetic recording medium in which at least a magnetic layer is formed on both sides of a disc-shaped substrate having an opening in the center, and deposits on at least the surface of the magnetic recording medium using an adhesive tape In doing so, the magnetic recording medium is sandwiched between a plurality of rolls that are brought into contact with each other via an adhesive tape, and the roll is rotated to move the adhesive tape, and the magnetic recording medium is moved relative to the roll, or the roll is magnetically recorded. A method for treating a surface of a magnetic recording medium, characterized in that the magnetic recording medium is moved along the surface, and deposits on at least the surface of the magnetic recording medium are collected by an adhesive tape.

(2) A method for treating the surface of a magnetic recording medium in which at least a magnetic layer is formed on both sides of a disc-shaped substrate having an opening in the center, and collecting deposits on at least the surface of the magnetic recording medium using an adhesive tape In doing so, the magnetic recording medium is rotated around the central opening, the roll is brought into contact with the surface of the rotating magnetic recording medium via an adhesive tape, and deposits on at least the surface of the magnetic recording medium are collected by the adhesive tape. A surface treatment method for a magnetic recording medium.
(3) The above (2) is characterized in that the adhesive tape brought into contact with the surface of the magnetic recording medium is caused to travel by the rotation of the roll, and a difference is provided between the traveling speed of the surface of the magnetic recording medium and the traveling speed of the adhesive tape. A method for surface treatment of the magnetic recording medium described.
(4) The above-mentioned (3), characterized in that the running speed of the surface of the magnetic recording medium is set higher in the range of 0.5 m / min to 300 m / min than the running speed of the adhesive tape in contact with the surface. The method for surface treatment of a magnetic recording medium according to (1).
(5) The surface treatment of the magnetic recording medium according to any one of the above (1) to (4), wherein the adhesive strength of the adhesive tape is in the range of 0.01 N / cm to 3 N / cm. Method.

(6) The surface treatment method for a magnetic recording medium according to any one of (1) to (5) above, wherein the adhesive is a polyacrylate ester adhesive.
(7) Any one of the above (1) to (6), wherein a lubricant is applied to the surface and / or end surface of the magnetic recording medium, and then at least the deposits on the surface are collected with an adhesive tape. 2. A method for surface treatment of a magnetic recording medium according to 1.
(8) A surface treatment apparatus for a magnetic recording medium in which at least a magnetic layer is formed on both sides of a disc-shaped substrate having an opening in the center, and a mechanism for supplying and contacting an adhesive tape to both surfaces of the magnetic recording medium with a roll, A surface treatment apparatus for a magnetic recording medium having a mechanism for moving a recording medium or an adhesive tape.
(9) A magnetic recording medium surface treatment apparatus in which at least a magnetic layer is formed on both sides of a disc-shaped substrate having an opening in the center, and the magnetic recording is performed on an axis perpendicular to the surface centering on the opening of the magnetic recording medium. A magnetic recording medium surface treatment apparatus having a mechanism for rotating a medium, a mechanism for supplying and contacting an adhesive tape with a roll on the surface of the magnetic recording medium, and a mechanism for running the adhesive tape.

According to the invention of (1), both surfaces and end surfaces of the disk-shaped magnetic recording medium can be processed at the same time, and the processing can be easily performed continuously. It is possible to remove dust on the medium surface and the end surface.
According to the invention of (2), it is possible to simultaneously process both surfaces and end surfaces of the disk-shaped magnetic recording medium, and it is possible to remove dust on the surface of the magnetic recording medium with high efficiency.
According to the above inventions (3) to (4), the effect of rubbing between the surface of the magnetic recording medium and the pressure-sensitive adhesive tape works, and the mutual relationship can be brought into a preferable state. Therefore, the dust removal efficiency on the surface of the magnetic recording medium is improved. It becomes possible.
According to the above inventions (5) to (6), the pressure-sensitive adhesive has an appropriate pressure-sensitive adhesive force, maintains the pressure-sensitive adhesive force without damaging the magnetic recording medium, and makes the running speed of the pressure-sensitive adhesive tape more preferable. Therefore, the dust removal efficiency on the surface of the magnetic recording medium can be increased.
According to the invention of (7) above, the scratching property of the adhesive tape on the surface of the magnetic recording medium is improved, and the surface of the magnetic recording medium can be easily removed, so that the dust on the surface of the magnetic recording medium can be removed. Efficiency can be increased.
According to the above inventions (8) to (9), it is possible to provide an apparatus suitable for the surface treatment method for removing dust on the surface of the magnetic recording medium.

The first aspect of the present invention relates to a surface treatment method for a magnetic recording medium in which at least a magnetic layer is formed on both surfaces of a disc-shaped substrate having an opening in the center, and deposits on the surface of the magnetic recording medium are collected using an adhesive tape. In doing so, the magnetic recording medium is brought into contact via an adhesive tape, sandwiched from both sides by a plurality of rolls, and the adhesive tape and the magnetic recording medium are moved and moved by rotating the roll to remove the deposits on at least the surface of the magnetic recording medium. It is characterized by being collected by adhesive tape.
The first of the present invention will be described in detail with reference to FIG. FIG. 1 schematically shows a method for removing dust adhering to a magnetic recording medium according to the present invention. The magnetic recording medium of the present invention is a disk-shaped substrate having an opening at the center. This central opening is for mounting and rotating the spindle of the rotary motor to move the magnetic recording medium relative to the magnetic head. In the present invention, when the deposits on the surface of the magnetic recording medium 1 are collected using the adhesive tape 2, the magnetic recording medium 1 is sandwiched between a plurality of rolls 3 that are brought into contact with each other via the adhesive tape 2. Is rotated and the adhesive tape 2 or the magnetic recording medium 1 is moved and traveled, and deposits on at least the surface of the magnetic recording medium are collected by the adhesive tape. That is, the adhesive tape collects dust on the surface of the magnetic recording medium by giving the adhesive tape 2 a surface on the magnetic recording medium 1 side. At this time, the adhesive tape travels by rotating the roll 3. Further, by rotating the roll, the magnetic recording medium can be moved relative to the roll, or the roll can be moved along the surface of the magnetic recording medium (vertical direction in the figure).

That is, in FIG. 1, when the magnetic recording medium 1 is fixed, the adhesive tape 2 moves and travels (in this case, the roll 3 also moves and travels along the surface of the magnetic recording medium 1). When the roll 3 is fixed, the magnetic recording medium 1 moves and travels. At this time, the roll 3 has the effect of moving the magnetic recording medium 1 or the adhesive tape 2 and moving the adhesive tape 2 against the magnetic recording medium 1 with an appropriate pressure. In FIG. 1, since the rolls 3 are located at symmetrical positions on both sides of the magnetic recording medium 1, the pressure applied to the adhesive tape applied to both sides of the magnetic recording medium is the same on both sides. Then, by adjusting the hardness of the material used for the roll 3, it is possible to press the adhesive tape against the end face of the magnetic recording medium. That is, by reducing the hardness of the roll 3, it is possible to bend the adhesive tape to the end surface of the magnetic recording medium, thereby removing dust adhering to the end surface of the magnetic recording medium. In addition, when removing the dust adhering to the end surface of the magnetic recording medium, a roll that presses the adhesive surface of the adhesive tape against the end surface of the magnetic recording medium may be provided separately from the data surface of the magnetic recording medium.

  By using such a configuration, the present invention makes it possible to simultaneously process both surfaces and end surfaces of a disk-shaped magnetic recording medium, and continuously supply the magnetic recording medium to an adhesive tape and a roll. By doing so, it becomes easy to perform the process continuously. Thereby, dust on the surface of the magnetic recording medium can be removed with high efficiency. In FIG. 1, only one magnetic recording medium is shown for simplification, but it is possible to continuously supply the magnetic recording medium to this apparatus. As a method of continuously supplying the magnetic recording medium to this apparatus, a method of supplying the magnetic recording medium while supporting the inner peripheral end face or the outer peripheral end face of the magnetic recording medium with a chuck device is conceivable. Similarly, for the magnetic recording medium coming out of the apparatus, a method of receiving the inner peripheral end face or the outer peripheral end face of the magnetic recording medium with a chuck device can be considered.

As the pressure-sensitive adhesive material used in the pressure-sensitive adhesive tape of the present invention, known materials can be used. Among these, it is preferable to use a material that is hardly transferred to the surface of the magnetic recording medium. Whether or not the adhesive material applied to the surface of the adhesive tape is transferred to the surface of the magnetic recording medium in the method of the present invention depends on the film used as the base of the adhesive tape in addition to the type of the adhesive material. In the invention, it is preferable to use a polyacrylate ester-based adhesive material as the adhesive material.
The film used in the pressure-sensitive adhesive tape of the present invention depends on the compatibility with the pressure-sensitive adhesive as described above, but when a polyacrylate-based pressure-sensitive adhesive is used, polyethylene, polypropylene, ethylene / vinyl acetate copolymer It is preferable to use a single layer or multilayer film made of coalesced, polyvinyl chloride, polyamide, polyester or the like. Specific examples of such films include ICROS (registered trademark) tape manufactured by Mitsui Chemicals, ELEP holder manufactured by Nitto Denko Corporation, Adwill (registered trademark) manufactured by Lintec Corporation, and Furukawa Electric Co., Ltd. UV tape SP series and UV tape UC series, and ELEGRIPT (trademark) tape manufactured by Toyo Chemical Co., Ltd.

The second aspect of the present invention relates to a method for surface treatment of a magnetic recording medium in which at least a magnetic layer is formed on both sides of a disc-shaped substrate having an opening in the center, and collects deposits on the surface of the magnetic recording medium using an adhesive tape. In doing so, the magnetic recording medium is rotated around the central opening, the adhesive tape is brought into contact with the surface of the rotating magnetic recording medium, and the deposit on at least the surface of the magnetic recording medium is collected by the adhesive tape. .
The second of the present invention will be described in detail with reference to FIG. In the present invention, when the deposits on the surface of the magnetic recording medium 1 are collected using the adhesive tape 2, the magnetic recording medium 1 is rotated about an opening at the center and an axis perpendicular to the surface of the magnetic recording medium. The adhesive tape 2 is brought into contact with the surface of the rotating magnetic recording medium 1 using, for example, a roll 3, and deposits on at least the surface of the magnetic recording medium 1 are collected by the adhesive tape. Deposits can also be removed from the end face of the magnetic recording medium 1 as in the first invention. In FIG. 2, a motor and a motor shaft for rotating the magnetic recording medium 1 are omitted, but these mechanisms are actually required. Since such a mechanism is required, the pressure-sensitive adhesive tape 2 that is brought into contact with the magnetic recording medium 1 and the roller 3 that presses the pressure-sensitive adhesive tape 2 against the magnetic recording medium 1 are formed on the surface of the magnetic recording medium 1 as shown in FIG. It is preferable in terms of the structure to provide only at the radial position.

In the configuration of FIG. 2, it is possible to rotate the magnetic recording medium 1 and stop the roller 3 to run the adhesive tape 2, or to run the adhesive tape 2 by rotating the roller 3. You can also. In the present invention, it is preferable that the pressure-sensitive adhesive tape brought into contact with the surface of the magnetic recording medium is run, and the speed of the surface of the magnetic recording medium is set with a difference from the running speed of the pressure-sensitive adhesive tape brought into contact with the surface. By using such a configuration, it becomes possible to always supply a clean adhesive surface to the surface of the magnetic recording medium, and the adhesive tape gives repulsive force (shearing force) to the surface of the magnetic recording medium. Dust adhering to the magnetic recording medium surface with higher force can be collected on the adhesive tape.
In the present invention, the speed of the surface of the magnetic recording medium is preferably set higher in the range of 0.5 m / min to 300 m / min with respect to the running speed of the pressure-sensitive adhesive tape brought into contact with the surface. By setting both speeds in this way, dust adhering to the surface of the magnetic recording medium can be collected on the adhesive tape with a more preferable repulsive force.
In the present invention, the adhesive strength of the adhesive tape is preferably within the range of 0.01 N / cm to 3 N / cm. By setting the adhesive force of the adhesive tape within such a range, dust attached to the surface of the magnetic recording medium can be removed with high efficiency. For example, fine dust of 0.2 microns or less can be removed. it can. If the adhesive force is less than 0.01 N / cm, the dust removing action is poor, and if it exceeds 3 N / cm, the surface of the magnetic recording medium may be damaged or the adhesive substance may be transferred to the surface of the magnetic recording medium.

In the present invention, it is preferable to apply a lubricant to the surface of the magnetic recording medium in advance when dust adhering to the surface of the magnetic recording medium is collected using an adhesive tape. In the present invention, as described above, the adhesive tape that is brought into contact with the surface of the magnetic recording medium is run, the speed of the surface of the magnetic recording medium is set higher than the running speed of the adhesive tape that is brought into contact with the surface, A repulsive force from the adhesive tape surface is applied to the surface of the magnetic recording medium. At this time, by applying a lubricant to the surface of the magnetic recording medium, this repulsive force is stabilized and dust can be efficiently attached to the surface of the adhesive tape. In addition, by applying a lubricant to the magnetic recording medium, dust on the surface can be lifted and collected easily.
In the present invention, in order to realize the above-described surface treatment method of the magnetic recording medium, a mechanism for supplying an adhesive tape to both data surfaces of the magnetic recording medium, a mechanism for bringing the adhesive tape into contact with both data surfaces of the magnetic recording medium, and magnetic recording It is preferable to use a magnetic recording medium surface treatment apparatus having a mechanism for moving the medium or the adhesive tape. Also, a mechanism that rotates the magnetic recording medium around the opening of the magnetic recording medium about an axis perpendicular to the surface, a mechanism that supplies adhesive tape to both surfaces of the magnetic recording medium, and an adhesive tape that contacts both surfaces of the magnetic recording medium It is preferable to use a surface treatment apparatus for a magnetic recording medium having a mechanism for moving the adhesive tape and a mechanism for running an adhesive tape.

(Manufacture of magnetic recording media)
As a disk-shaped substrate, an amorphous glass substrate manufactured by HOYA was used. The glass substrate has an outer diameter of 65 mm, an inner diameter of 25 mm, and a plate thickness of 1.27 mm. The substrate was textured, thoroughly washed and dried, and then set in a DC magnetron sputtering apparatus (C3010 manufactured by Anelva (Japan)). After exhausting the vacuum to 2 × 10 −7 Torr (2.7 × 10 −5 Pa), using a target made of a Cr—Mn alloy (Cr: 70 at%, Mn: 30 at%) as a nonmagnetic underlayer Laminated 6 nm. Co-Cr-Pt-B alloy which is a magnetic layer using a target made of a Co-Cr-Pt-B alloy (Co: 60 at%, Cr: 20 at%, Pt: 13 at%, B: 7 at%) as a magnetic layer The layer was formed to a thickness of 17 nm, and a protective film (carbon) 3 nm was laminated. The Ar pressure during film formation was 3 mTorr (0.4 Pa). Thereafter, a lubricant 2 nm composed of perfluoropolyether was applied by a dip method to form a liquid lubricant layer.

Example 1
The manufactured magnetic recording medium was dust-removed using the apparatus having the structure shown in FIGS. In the apparatus of FIG. 1, an adhesive tape having an adhesive strength of 1 N / cm was used, and in the apparatus of FIG. 2, an adhesive tape having an adhesive strength of 0.3 N / cm was used. The pressure-sensitive adhesive tape used in this apparatus is a polyacrylic acid ester-based pressure-sensitive adhesive, and the film is ICROS (registered trademark) tape manufactured by Mitsui Chemicals. In the example using the apparatus of FIG. 1, the feeding speed of the magnetic recording medium surface and the feeding speed of the adhesive tape were the same, and the feeding speed was 200 cm / min. In the apparatus shown in FIG. 2, a shaft was inserted into the opening of the magnetic recording medium, and the shaft was rotated around the shaft. The rotational speed was 100 rpm and the adhesive tape feed speed was 50 cm / min. The supply of the magnetic recording medium in the apparatus of FIG. 1 was performed while chucking the inner end face of the magnetic recording medium, and the processed magnetic recording medium that came out of the apparatus was also received by chucking the inner end face. In both the apparatus of FIG. 1 and FIG. 2, a roll made of isopropylene rubber, hardness 30 was used, and the roll pressure was 8N. Under these conditions, each apparatus processed 100 magnetic recording media, and counted the number of dust particles of 0.1 μm or more adhering to the magnetic recording media before and after the processing. As a result, when the apparatus of FIG. 1 was used, the average number of dust before processing was 3 / sheet, but after processing was 1.5 / sheet. When the apparatus of FIG. 2 was used, the average number of dust before processing was 2.5 pieces / sheet, whereas that after processing was 0.5 pieces / sheet.

    Since dust adhering to both surfaces of a magnetic recording medium having a high degree of cleanness is efficiently removed and there is no reattachment of dust, it is highly industrially useful as a magnetic recording medium having a high recording density.

1 is a schematic diagram of a surface treatment apparatus for a magnetic recording medium according to the present invention. The schematic diagram of the other surface treatment apparatus of the magnetic recording medium of this invention is shown.

Explanation of symbols

1 Magnetic recording medium 2 Adhesive tape 3 Rotating roll

Claims (9)

  A method of treating the surface of a magnetic recording medium having at least a magnetic layer formed on both sides of a disc-shaped substrate having an opening in the center, and collecting deposits on at least the surface of the magnetic recording medium using an adhesive tape, The magnetic recording medium is sandwiched between a plurality of rolls brought into contact with each other through an adhesive tape, and the roll is rotated to run the adhesive tape, and the magnetic recording medium is moved relative to the roll or the roll is moved along the magnetic recording surface. A surface treatment method for a magnetic recording medium, wherein at least a surface deposit on the magnetic recording medium is collected by an adhesive tape.   A method of treating the surface of a magnetic recording medium having at least a magnetic layer formed on both sides of a disc-shaped substrate having an opening in the center, and collecting deposits on at least the surface of the magnetic recording medium using an adhesive tape, Rotating the magnetic recording medium around the central opening, bringing the roll into contact with the surface of the rotating magnetic recording medium via an adhesive tape, and collecting deposits on at least the surface of the magnetic recording medium with the adhesive tape A surface treatment method for a magnetic recording medium.   3. The magnetic recording according to claim 2, wherein the pressure-sensitive adhesive tape brought into contact with the surface of the magnetic recording medium is caused to travel by the rotation of a roll, and a difference is provided between the traveling speed of the surface of the magnetic recording medium and the traveling speed of the adhesive tape. A surface treatment method for a medium.   The traveling speed of the surface of the magnetic recording medium is set higher in the range of 0.5 m / min to 300 m / min than the traveling speed of the pressure-sensitive adhesive tape in contact with the surface. A method for surface treatment of a magnetic recording medium.   The surface treatment method for a magnetic recording medium according to any one of claims 1 to 4, wherein the adhesive strength of the adhesive tape is in the range of 0.01 N / cm to 3 N / cm.   6. The surface treatment method for a magnetic recording medium according to claim 1, wherein the adhesive material is a polyacrylate ester adhesive material.   The magnetic recording medium according to claim 1, wherein after the lubricant is applied to the surface and / or the end face of the magnetic recording medium, at least the deposits on the surface are collected by an adhesive tape. Surface treatment method.   A surface treatment apparatus for a magnetic recording medium in which at least a magnetic layer is formed on both sides of a disc-shaped substrate having an opening in the center, the mechanism for supplying and contacting an adhesive tape with a roll on both surfaces of the magnetic recording medium, A surface treatment apparatus for a magnetic recording medium having a mechanism for moving an adhesive tape.   A surface treatment apparatus for a magnetic recording medium in which at least a magnetic layer is formed on both sides of a disk-shaped substrate having an opening in the center, and the magnetic recording medium is rotated about an axis perpendicular to the surface centered on the opening of the magnetic recording medium A surface treatment apparatus for a magnetic recording medium, comprising: a mechanism for causing the adhesive tape to be brought into contact with the surface of the magnetic recording medium by a roll; and a mechanism for causing the adhesive tape to travel.

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