JPH1125609A - Magnetic disk and magnetic disk device using the magnetic disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of recording/reproducing of information by setting the recording track widths of a magnetic disk to be different from one another in a radial direction. SOLUTION: A magnetic head arm 11 is placed in parallel with a recording track 7a when a magnetic head is on the outer peripheral line G-G of a magnetic disk 3. On the other hand, when the magnetic head is on the inner peripheral line N-N of the magnetic disk 3, the magnetic head draws a circular track around a rotary shaft 13 for supporting the magnetic head arm 11, the inclination of an angle is generated between a magnetic track 7b and the magnetic head and a contact area therebetween is reduced. Thus, when the magnetic head 3 is on the outer peripheral part of the magnetic disk 3 and an angle is near 0, the width of the recording track 7a is set equal to the width H of the magnetic head. On the other hand, when the magnetic head is moved to the inner peripheral part of the magnetic disk 3 where angle inclination occurs, the width of the recording track 7b is increased according to the angle to oppose the magnetic head and the recording track 7b to each other in a wide area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk and a magnetic disk device using the same, and more particularly, to a magnetic disk characterized by a physical format and a magnetic disk device using the same.

[0002]

2. Description of the Related Art Conventionally, there have been the following magnetic disks. That is, in a disk-shaped magnetic disk main body and a magnetic disk in which a recording surface of the magnetic disk main body is coated with a predetermined magnetic material, a plurality of recording tracks are formed substantially concentrically on the recording surface of the magnetic disk. is there. Here, each recording track has the same width on both the inner circumference side and the outer circumference side of the magnetic disk. Recording and reproduction of information are performed for each recording track.

[0003] In addition to the above-described magnetic disk, the magnetic disk device is provided with a magnetic head for recording information on a recording track of the magnetic disk or reading information from the recording track. This magnetic head magnetizes the recording surface of the magnetic disk in the vicinity of each recording track to record information, or reads out a magnetic change to reproduce information. The magnetic head is carried on a magnetic head arm disposed near the magnetic disk, and the magnetic head arm rotates to move the magnetic head in the radial direction of the magnetic disk. That is, when recording and reproducing information, the magnetic head arm rotates about a predetermined rotation axis. Along with this, the magnetic head also moves on the magnetic disk along a circular orbit about the rotation axis, and performs recording and reproduction on different recording tracks.

[0004]

However, the prior art described above has the following disadvantages. That is, the magnetic head moving mechanism employed in the general magnetic disk device at present is of the type (rotary system) that swings the magnetic head arm as described above. For this reason, the proximity state of the magnetic head to each recording track changes depending on whether the magnetic head is positioned on the outer circumference or the inner circumference of the magnetic disk.

More specifically, as shown in FIG. 3, when the magnetic head 53 is positioned on the outer periphery of the magnetic disk, the recording track 55 and the magnetic head 53 are made substantially parallel. In this case, the magnetic head 53 faces the recording track 55 in a wide area. Therefore, the reliability of information recording and reproduction is high. On the other hand, when the magnetic head 53 is positioned at the inner peripheral portion of the magnetic disk, FIG.
As shown in (B), the recording track 55 and the magnetic head 5
3, a predetermined angle difference (YAW angle) is generated. As a result, the facing area between the recording track 55 and the magnetic head 53 decreases. As a result, the conventional format type magnetic disk has a disadvantage that a recording error and a reproduction error easily occur in the inner peripheral portion of the magnetic disk.

It is also conceivable to increase the width of each recording track 55 in order to reduce recording errors and reproduction errors. However, if the width of each recording track 55 is uniformly increased, the recording density of the magnetic disk as a whole decreases.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the disadvantages of the prior art and to provide a magnetic disk having high reliability in recording and reproducing information and a high recording density.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a plurality of recording tracks are formed substantially concentrically on a predetermined recording surface while being formed in a disk shape. In this magnetic disk, each recording track has a different width along the radial direction of the magnetic disk. With the configuration described above, the facing area between the magnetic head and the recording track is ensured at any of the outer peripheral portion and the inner peripheral portion of the magnetic disk. Thereby, the reliability of information recording and reproduction is improved.

Further, the invention according to claim 2 adopts a configuration in which the width of the recording track is gradually increased from the outer peripheral portion to the middle inner peripheral portion of the magnetic disk. Same as the invention.

Further, according to the third aspect of the present invention, a magnetic head for recording and reproducing information on a magnetic disk, a magnetic head arm for carrying the magnetic head, and a magnetic head mounted on the magnetic disk via the magnetic head arm. In a magnetic disk device having a magnetic head moving mechanism for moving in a radial direction, a configuration is adopted in which the width of a recording track is changed according to an angle between the recording track and the magnetic head. This is the same as the invention described in 1 or 2.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the magnetic disk 3 according to the present embodiment is formed in a disk shape,
A plurality of five recording tracks 7a and 7b are formed substantially concentrically on a predetermined recording surface. Here, two recording tracks 7a and 7b are described for convenience, but a large number of thinner recording tracks are actually formed. The recording tracks 7a and 7b have different widths along the radial direction of the magnetic disk 3. The details will be described below.

FIG. 1 is a plan view showing the entire magnetic disk drive 1. The magnetic disk 3 is an aluminum disk whose surface is covered with a magnetic material, and is carried on a rotating shaft 9. A predetermined motor (not shown) is engaged with the rotation shaft 9 to rotate the magnetic disk 3 at a predetermined rotation speed. In the vicinity of the magnetic disk 3,
A magnetic head arm 11 is provided. The magnetic head arm 11 is pivotally supported by a predetermined rotation shaft 13, and swings about the rotation shaft 13 by the action of the magnetic head moving mechanism 15.

A magnetic head for recording / reproducing information on / from the magnetic disk 3 is provided at the tip of the magnetic head arm 11 (see FIG. 2). This magnetic head 17
The information is recorded by magnetizing the recording surface 5 of the magnetic disk 3, and the information is reproduced by capturing the magnetic change of the recording surface 5 of the magnetic disk 3. When the magnetic head 17 is stopped on the magnetic disk 3, the magnetic disk 3 itself rotates, so that information can be recorded / reproduced. When the magnetic head arm 11 swings, the magnetic head arm 11 swings. The magnetic head 17 moves on the magnetic disk 3 in the radial direction. Thereby, information can be recorded and reproduced on different recording tracks.

When the magnetic head 17 is positioned on the outer periphery thereof (on the line GG in FIG. 1), it is substantially parallel to the direction of the recording track 7a (see FIG. 2A). . This is because the recording track 7a is formed concentrically on the surface of the magnetic disk 3 and the shape of the magnetic head arm 11 is devised so that the magnetic head 17 is parallel to the recording track 7a on the outer periphery of the magnetic disk 3. Because it is.

On the other hand, when the magnetic head 17 is positioned on the inner periphery of the magnetic disk 3 (on the line NN in FIG. 1), the recording track 7 is moved by the movement of the magnetic head 17.
b and a slight inclination (YAW
Corner). This is because the recording track 7b is formed concentrically on the magnetic disk 3 as described above, whereas the magnetic head 17 moves in a circular orbit around the rotating shaft 13 supporting the magnetic head arm 11. Because I draw.

In this case, FIG. 3 shows a conventional magnetic disk.
When the width of the recording track 55 is narrow as in (B), the magnetic head 53 partially deviates from the recording track. Therefore, in the conventional physical format, the inclination of the magnetic head 53 with respect to the recording track 55 indicates
The contact surface between the magnetic head 53 and the recording track 55 becomes very small (see FIG. 3B). However, in the magnetic disk 3 of the present embodiment, as shown in FIG. 2B, the width of the recording track 7b is wide.

As shown in FIG. 2B, the width of the recording track 7b is L when the total length of the magnetic head 17 is L and the inclination between the recording track 7b and the magnetic head 17 is θ.
sin θ. That is, when the magnetic head 17 is positioned on the outer peripheral portion of the magnetic disk 3 and the inclination between the magnetic head 17 and the recording track 7a is almost zero, the width of the recording track 7a in this area is equal to the width H of the magnetic head. Equal to On the other hand, when the magnetic head 17 is inclined with respect to the recording track 7b, the width of the recording track 7b is gradually increased according to the inclination. In the present embodiment, since the magnetic head 17 is located on the outer peripheral portion of the magnetic disk 3, the width of the recording track 7b is the largest on the inner peripheral portion.

In this embodiment, since the magnetic head 17 is parallel to the recording track 7a at the outer periphery of the magnetic disk 3, the width of the outer periphery of the magnetic head 17 is equal to the width H of the magnetic head. Is almost equivalent to However, the present invention is not limited to this, and for example, the magnetic disk 3
The recording track and the magnetic head 17 may be parallel. In this case, the width of the recording track on the inner peripheral portion of the magnetic disk is narrow, and the width of the recording track on the outer peripheral portion is increased. Further, the width of the recording track at the intermediate portion in the radial direction of the magnetic disk may be reduced, and the width of the recording track at the outer peripheral portion and the inner peripheral portion may be increased.

The operation of the magnetic disk 3 and the magnetic disk device 1 described above will be described. When the magnetic head arm 11 is positioned on the outer peripheral portion of the magnetic disk 3 (on the line GG in FIG. 1), the magnetic head 17 is parallel to the recording track 7a and almost entirely on the recording track 7a. Are facing each other. Therefore, the possibility of occurrence of an information recording / reproducing error with respect to the recording track 7a is low.

Even when the magnetic head 17 moves to the inner peripheral portion of the magnetic disk 3 due to the swing of the magnetic head arm 11, the width of the recording track 7b in this area is sufficiently ensured (FIG. 2B). reference). Therefore, also in this case, the magnetic head 3 faces the recording track 7b with a large area. Therefore, similarly to the above, the possibility of occurrence of an information recording / reproducing error with respect to the recording track 7b is low. Further, since the recording / reproducing error hardly occurs as described above, the necessity of error correction and the like is reduced, and the recording / reproducing operation on the magnetic disk 3 can be performed at high speed.

[0021]

As described above, according to the present invention, there is provided a magnetic disk in which a plurality of recording tracks are formed substantially concentrically on a predetermined recording surface while being formed in a disk shape.
Each recording track had a different width along the radial direction of the magnetic disk. Therefore, even when the magnetic head moves on the magnetic disk along with the swing of the magnetic head arm, a sufficient opposing area between the magnetic head and the recording track is always ensured. Therefore, an excellent effect that the accuracy of recording and reproduction on the magnetic disk is improved is produced. Also,
Accordingly, the recording / reproducing error correction processing is unnecessary or requires less processing than in the past, so that an excellent effect that the speed of a fixed magnetic disk or the like can be further increased can be obtained.

In the magnetic disk of the present invention, only the width required for recording tracks is secured at the inner and outer peripheral portions of the magnetic disk. As a result, an excellent effect that the recording density can be increased as compared with the case of

[Brief description of the drawings]

FIG. 1 is a plan view showing a magnetic disk drive of the present invention.

2A and 2B are plan views showing a relationship between a magnetic head and a recording track according to the present invention. FIG. 2A shows a case where the magnetic head is parallel to the recording track, and FIG. 3 shows a case where the magnetic head is slightly inclined.

3A and 3B are plan views showing a relationship between a conventional magnetic head and a recording track; FIG. 3A shows a case where the magnetic head is parallel to the recording track, and FIG. On the other hand, the case where the magnetic head is slightly inclined is shown.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic disk drive 3 Magnetic disk 5 Recording surface 7a Recording track (outer periphery) 7b Recording track (inner periphery) 11 Magnetic head arm 13 Rotating shaft 15 Magnetic head moving mechanism 17 Magnetic head

Claims (3)

[Claims] 1. A magnetic disk having a disk shape and a plurality of recording tracks formed substantially concentrically on a predetermined recording surface, wherein the recording tracks are different from each other along a radial direction of the magnetic disk. A magnetic disk having a width. 2. The magnetic disk according to claim 1, wherein a width of the recording track is gradually increased from an outer peripheral portion to a middle inner peripheral portion of the magnetic disk. 3. A magnetic head for recording / reproducing information on / from the magnetic disk, a magnetic head arm for carrying the magnetic head, and a magnetic head for moving the magnetic head in a radial direction of the magnetic disk via the magnetic head arm. 2. The magnetic disk device having a moving mechanism, wherein the width of the recording track is changed according to an angle between the recording track and the magnetic head.
Or a magnetic disk device using the magnetic disk according to 2.