JP2002260223A - Magnetic disk transcribing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the contact between a magnetic disk and a master disk with a simple and low-cost structure to which particles hardly adhere. SOLUTION: A magnetic transcription is conducted as follows: The master disk 13 in which a prescribed pattern recorded is brought into firm contact with the magnetic disk 12 and the prescribed pattern is transcribed into the magnetic disk 12 by adding magnetic field from a transcription magnet 14. In this case, for example, a band-like soft magnetic ribbon 15 consisting of fibers 16 and a soft magnetic thin film 17 is arranged on the different side of the magnetic disk 12 to the face where the magnetic disk 12 gets firm contact with the master disk 13, thereby improves the close contact between the magnetic disk 12 and the master disk 13 by making use of the force with which the transcription magnet 14 attracts the soft magnetic thin film 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard disk drive (hereinafter referred to as an HD) using a magnetic film as a recording material, which has recently become the mainstream as an external storage device of a computer.
D), the present invention relates to a magnetic disk transfer device for magnetically writing a servo signal for positioning a magnetic head for writing / reading data written on the surface of a magnetic disk or specific data using a transfer technique.

[0002]

2. Description of the Related Art Generally, a magnetic disk is shipped in a state in which nothing is written, and after being incorporated in an HDD device,
Magnetic information required by the HDD device is written. HDD
In this method, the magnetic disk is magnetically partitioned into concentric tracks having a fixed width, and data is written while the head follows the tracks. H
The DD detects a head displacement from a magnetic signal called a servo signal written on a track, and controls the head so as not to deviate from the track. This operation is called track servo.

However, in order to precisely write concentric servo signals on a magnetic disk on which nothing is written,
A device with a precise position control function is required.
Since the mechanism required for positioning is inserted into the HDD from the outside, the operation has to be performed in a clean room to prevent dust from entering the HDD. In addition, it takes several tens of minutes to write servo signals on tens of thousands of tracks on one surface while performing precise alignment. As described above, it is necessary to perform the servo signal writing operation for each HDD in a clean room, and the use of a high-precision device has caused an increase in the manufacturing cost of the HDD.

Recently, a special disk for magnetic transfer called a master disk having the above-described servo signal pattern is brought into close contact with the magnetic disk, and a magnetic field is applied from the outside, so that the servo signal pattern is instantaneously changed. Magnetic transfer technology has been developed in which the image is transferred to an image.
This makes it possible to reduce the drive manufacturing cost and increase the track density (narrow the track width). However, in magnetic transfer, the adhesion between the master disk and the magnetic disk to be transferred greatly affects the quality of the transfer signal.
If the adhesion is poor and the distance between the master disk and the magnetic disk varies, the quality of the transfer signal deteriorates.

[0005]

However, when the magnetic disk is a hard glass substrate and its size is reduced, plasticity is lost, and it becomes difficult to increase the adhesion between the master disk and the magnetic disk without external pressure. . For example, if a method of pressing with a plate or a bar is used, the force cannot be applied evenly, and the magnetic disk or the master disk is likely to be damaged. If the method is adopted in which air is brought into close contact, the mechanism for that purpose becomes large, and if the size of the magnetic disk is small, interference with a transfer magnet mechanism or the like makes it difficult to design the mechanism. In addition, there is a possibility that particles may be attached to the magnetic disk by increasing or decreasing the air pressure during the operation of sucking and separating the magnetic disk. Therefore, an object of the present invention is to provide a configuration which is small and inexpensive, and in which particles do not easily adhere.

[0006]

According to the first aspect of the present invention, a master disk on which a specific magnetic information pattern is recorded is brought into close contact with a magnetic disk to apply a magnetic field from the outside. A magnetic disk transfer device for transferring a predetermined magnetic information pattern formed on the master disk onto the magnetic disk,
The magnet for applying the magnetic field is arranged on a side of the master disk which is different from the contact surface with the magnetic disk, and a magnetic body is arranged on the side of the magnetic disk which is different from the contact surface with the master disk. It is characterized in that the adhesion between the master disk and the magnetic disk is improved by utilizing the force of the body being attracted to the magnet.

According to the first aspect of the present invention, the magnetic body may have a multilayer structure of a soft magnetic film and a fiber film (the second aspect of the invention), or the magnetic body may be a magnetic thin film. (Invention of claim 3). These claims 1
In any one of the inventions (1) to (3), the magnetic material may be plural (the invention of claim 4).

[0008]

FIG. 1 is an overall configuration diagram showing a magnetic disk transfer apparatus including the present invention, and FIG. 2 is a configuration diagram showing details of a magnetic transfer unit in FIG. In FIG. 1, 1 is a magnetic disk transfer device, 2 is a cassette stage (entrance), 3 is a cassette stage (exit), 4 is a disk handler, 5
Is a disk holding / feeding mechanism, 6 is a vacuum suction head, 7
Denotes a cleaning section, 8 denotes a foreign substance inspection section, 9 denotes a magnetic erasing section,
Reference numeral 10 denotes a magnetic transfer unit, 11 denotes a disk cassette, and 12 denotes a magnetic disk.

In such a configuration, the magnetic disk 1
2 are usually put into the disk cassette 11 by 25 sheets, and are conveyed to the cassette stage 2 which is the transfer apparatus input port by the conveyor of the production line. The cassette stage 2 has a mechanism for pushing the disks up from the gap below the cassette, and raises the magnetic disks 12 one by one to the upper part of the disk cassette 11. The disk handler 4 has an inner peripheral chucking mechanism, inserts the chucking mechanism in a closed state on the inner periphery of the protruded magnetic disk 12, and then holds the magnetic disk 12 by opening the chucking mechanism.

The disk handler 4 holding the magnetic disk 12 rotates 180 degrees in the horizontal direction and 90 degrees in the vertical direction.
The magnetic disk thus held is mounted on the disk holding / feeding mechanism 5 inside the magnetic disk transfer device 1 by the rotation operation. The transfer operation of the magnetic disk mounted on the disk holding / feeding mechanism 5 is performed in the transfer device 1 in four stages as illustrated in FIG. Disk holding
The feed mechanism unit 5 is constituted by combining six arms having a vacuum suction head 6 for vacuum-holding and holding the inner peripheral portion of the disk at the front end thereof at an equal angle, and is held by one vacuum suction head 6. The four-stage transfer operation is sequentially performed on the magnetic disk 12 while the disk holding / feeding mechanism 5 makes one rotation on a horizontal plane. The remaining two stages are used for loading and unloading the magnetic disk.

The above-described transfer operation is performed in four steps of cleaning, foreign matter inspection, magnetic erasure, and magnetic transfer. For the magnetic disk 12 held by the disk handler 4 on a surface different from the magnetic transfer surface, the cleaning unit 7 performs a cleaning process on the magnetic transfer surface. As the cleaning process, there is a so-called tape cleaning system in which the tape is brought into contact with the medium surface to remove particles. By such a cleaning process, particles near the outermost peripheral portion, which do not cause a problem particularly when using a normal magnetic disk but cause a problem in magnetic transfer, are removed.

Next, the magnetic disk is optically inspected by a foreign substance inspection unit 8 to determine whether or not particles adhere to the magnetic transfer surface of the magnetic disk 12. As a result of this inspection, the magnetic disk 12 that has been determined to be free of particles that pose a problem in magnetic transfer should be magnetically erased on the magnetic transfer surface in the magnetic eraser 9 and then transferred in the magnetic transfer unit 10. It is brought into close contact with a master disk having a magnetic pattern, and magnetic transfer processing is performed. The magnetic disk 12 that has completed the magnetic transfer is transferred by the disk handler 4 to the disk cassette 11 waiting on the cassette stage 3 for exit. By the foreign matter inspection unit 8,
The magnetic disk 12 that is determined to have particles that cause a problem in magnetic transfer is skipped by the magnetic erasing process and the magnetic transfer process and discarded as a defective disk.

Next, a magnetic transfer system according to the present invention will be described with reference to FIG. In FIG. 2, 12 is a magnetic disk, 13 is a master disk, 14 is a transfer magnet, 1
Reference numeral 5 denotes a band soft magnetic ribbon including a fiber (fiber film) 16 and a soft magnetic thin film 17, and reference numeral 18 denotes a ribbon winding mechanism. As shown, a master disk 13 having a pattern to be magnetically transferred is placed on a magnetic disk 12.
In this state, when the magnetic disk 12 is rotated while maintaining a certain distance from the transfer magnet 14, the magnetic pattern formed on the master disk 13 is transferred onto the magnetic disk 12.

Below the magnetic disk 12, a band soft magnetic ribbon 15 is placed together with a ribbon winding mechanism 18 for feeding the ribbon. Here, the band soft magnetic ribbon 15 has a two-layer structure of a fiber 16 and a soft magnetic thin film 17. Fiber 1
Numeral 6 fulfills two functions of not damaging the magnetic disk 12 and removing dirt. Belt soft magnetic ribbon 1
5 is attracted to the transfer magnet 14 and pressed against the magnetic disk 12. The pressure brings the magnetic disk 12 into close contact with the master disk 13. Belt soft magnetic ribbon 15
When the magnetic disk 12 rotates for magnetic transfer, the magnetic disk 12 keeps a close contact state while sliding. The ribbon winding mechanism 18 prevents dirt from accumulating on the soft magnetic ribbon 15 due to the sliding operation.

FIG. 3 shows another example of the magnetic transfer system. As is apparent from the figure, the feature is that a magnetic thin film 19 is arranged below the magnetic disk 12. As a result, the magnetic thin film 19 is attracted and pressed against the magnetic disk 12 by the transfer magnet 14, as in the case of FIG. In this case, instead of rotating the magnetic disk 12, the transfer magnet 14 is
3 may be rotated.

FIG. 4 shows still another example of the magnetic transfer system. This shows a modified example of FIG.
7 is divided into two parts. The divided portions correspond to the yoke configuration of the transfer magnet 14, and are configured to emphasize a horizontal magnetic field component necessary for transfer generated from the transfer magnet 14. In this case, the ribbon winding mechanism 18 is formed in a cylindrical shape and rotates around its central axis. Generally, the number of soft magnetic thin films can be plural.

Here, the magnetic transfer step, the magnetic transfer signal pattern and the master disk will be described. As shown in FIG. 5, the magnetic transfer step is performed in two stages: a magnetic erase step and a magnetic pattern transfer step of bringing the magnetic disk 12 and the master disk 13 into close contact. In magnetic erasure, the entire surface is erased by rotating the magnetic disk 12 or the external erasing magnet 14 once while keeping the transfer magnet (the external erasing magnet) 14 at a fixed distance on the magnetic disk 12.
In the next magnetic pattern transfer, the master disk 13 is kept in close contact with the magnetic disk 12, and the transfer external magnet 14 that generates a magnetic field in the direction opposite to that at the time of erasure is kept at a constant distance. External magnet 14
Is performed by one rotation.

Magnetic transfer signal pattern (servo pattern)
As shown in FIG. 6, servo wedges 2 are arranged at regular intervals on the recording track 21 and are continuous in the radial direction.
It is configured as 0. Usually, about several hundred servo wedges 20 are written on one surface. The servo pattern includes a burst signal for giving a timing for reading the next track number indicating the beginning of the servo wedge 20, a track number information for showing the track position, a clock signal for giving a timing for taking in the track position signal, and a magnetic head from the track center. It is composed of a track position signal which gives information on how far it has shifted. The position control of the magnetic head is performed so that the signal amplitudes of the C phase and the D phase in the track position signal become equal.

As shown in FIG. 7, a transfer magnetic pattern 22 is formed on the surface of the master disk. Normally, the transfer magnetic pattern 22 is formed in a pattern having a width of about 1 μm, and the master disk 13 and the magnetic disk 12 on which magnetic transfer is performed have a width of about one-tenth to one-hundredth of the pattern width. It is necessary that the magnetic transfer process be performed while maintaining the adhesion.

[0020]

According to the present invention, the adhesion between the master disk and the magnetic disk, which is an important item during magnetic transfer, is reduced.
Since the magnetic material arranged on the side different from the contact surface of the magnetic disk uses the attractive force attracted to the transfer magnet, it is performed without adding a special drive mechanism, and it is possible to increase or decrease the air pressure. This has the advantage that the magnetic disk can be pressed without disturbing the airflow, and the adhesion can be further improved while suppressing the adhesion of particles.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a magnetic transfer device according to the present invention.

FIG. 2 is a configuration diagram of a first main part of the present invention.

FIG. 3 is a configuration diagram of a second main part of the present invention.

FIG. 4 is a configuration diagram of a third main part of the present invention.

FIG. 5 is an explanatory diagram of a magnetic transfer step.

FIG. 6 is an explanatory diagram of a magnetic transfer signal pattern.

FIG. 7 is an explanatory diagram of a master disk.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magnetic disk transfer apparatus, 2 ... Cassette stage (entrance), 3 ... Cassette stage (exit), 4 ... Disk handler, 5 ... Disk holding / feeding mechanism part, 6 ... Vacuum suction head, 7 ... Cleaning part, 8 ... Foreign matter inspection section, 9: magnetic erasing section, 10: magnetic transfer section, 11: disk cassette, 12: magnetic disk, 13: master disk, 14
... Transfer magnet, 15 ... Soft magnetic ribbon, 16 ... Fiber, 17
... soft magnetic thin film, 18 ... ribbon winding mechanism, 19 ... magnetic thin film.

Claims (4)

[Claims] A master disk on which a specific magnetic information pattern is recorded is brought into close contact with the magnetic disk and a magnetic field is applied from the outside, so that a predetermined magnetic information pattern formed on the master disk is placed on the magnetic disk. In the magnetic disk transfer device for transferring, the magnet for applying the magnetic field is provided on a side of the master disk which is different from the contact surface with the magnetic disk, and the magnetic material is provided on a side of the magnetic disk which is different from the contact surface with the master disk. A magnetic disk transfer device, wherein the magnetic material is arranged close to each other, and the adhesion between the master disk and the magnetic disk is improved by utilizing the force of the magnetic material attracted to the magnet. 2. The magnetic disk transfer device according to claim 1, wherein the magnetic body has a multilayer structure of a soft magnetic film and a fiber film. 3. The magnetic disk transfer device according to claim 1, wherein the magnetic material is a magnetic thin film. 4. The magnetic disk transfer device according to claim 1, wherein a plurality of said magnetic bodies are provided.