JPH05210929A - Disk driving device - Google Patents

Abstract

PURPOSE:To stabilize the low floating of a slider while preventing the damage at the time of start up by forming a magnetic disk to a shape having groove parts between a plane track part and a track part. CONSTITUTION:The data zone 7b of the magnetic disk 7 is formed to a shape having the grooves between the track parts in the plane region and the respective track parts. The start and stop of the slider mounted with the magnetic head are executed in the plane region. The contact force of the contact area of the slider and the disk 7 is decreased by such shape and the low floating of the slider is stabilized while the damage of the slider and the disk at the time of start up is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device incorporated in a computer or the like for recording and reproducing information, and more particularly to the shape of a magnetic disk.

[0002]

2. Description of the Related Art In a disk drive device incorporated in a computer or the like for recording and reproducing information,
As a matter of course, it is composed of a magnetic disk as an information recording medium and a magnetic head for recording and reproducing information on the magnetic disk.

At this time, as the magnetic head, in order to avoid wear and damage due to contact between the magnetic head and the magnetic disk, the magnetic head contacts the magnetic disk at the time of starting and stopping,
A so-called contact start / stop type flying magnetic head is used, which is configured to fly and run with a minute gap above the surface of a magnetic disk that rotates at a high speed during recording and reproduction of information.

The contact start / stop type flying magnetic head is a combination of a slider section having an air bearing surface which is a surface for receiving an air flow generated on the surface of a magnetic disk and a head section for recording / reproducing information. The slider is configured to have a support and a support is attached to the slider. Therefore, when the rotation of the magnetic disk is stopped, the slider integrally configured with the magnetic head contacts the surface of the magnetic disk, and when the magnetic disk rotates, the air flow generated by the rotation is transferred to the air bearing surface. The magnetic head, which is integrally formed with the slider, floats and moves on the surface of the magnetic disk by the support to record or reproduce information on a predetermined recording track.

As described above, in the contact start / stop type flying magnetic head, the slider is in contact with the surface of the magnetic disk at the time of starting and stopping, and the magnetic head is immediately after the starting operation or immediately after the stopping operation. Will be slid on. At this time, if the surfaces of the slider and the magnetic disk are too smooth, adhesion tends to occur between the both surfaces, the slider surface and the magnetic disk surface are worn, the product life is shortened, and abrasion powder generated by sliding is generated. It adheres to the slider surface and reduces the slider's levitation performance. Therefore, the surface of the magnetic disk is textured to provide a certain degree of roughness (usually, the protrusion height is around several tens of nm) to suppress the contact area between the slider and the magnetic disk, thereby preventing the above phenomenon.

With the demand for high-density recording, not only the improvement of the recording medium but also the downsizing and high-density and large-capacity of the disk drive device which can cope with this recording medium are demanded. In particular, the slider has been reduced in flying height, and research aiming at submicron flying is also being actively conducted. In order to realize such a low flying height of the slider, the surface properties of the slider and the magnetic disk become a serious problem, and higher smoothness is required.

However, in the contact start / stop type flying magnetic head as described above, if the slider and the magnetic disk surface are too smooth, the two surfaces are likely to come into contact and wear at the time of starting and stopping. Since texture processing is applied to prevent these phenomena, it is impossible to request the contact start / stop type flying magnetic head and the magnetic disk surface to have a high degree of smoothness. Therefore, it is very difficult to reduce the flying height of the contact start / stop type flying magnetic head.

Further, with the downsizing and high density and high capacity of disk drive devices, the demand for mounting these disk drive devices on laptops, notebook size personal computers, etc. is increasing, and the number of possible start and stop times is increased. It is necessary to take measures such as improving the impact resistance and impact resistance. However, as described above, in the contact start / stop type flying magnetic head, sliding occurs between the slider and the magnetic disk immediately after the start / stop operation, so the number of possible start / stop times increases and the shock resistance is improved. There seems to be a limit to the measures.

Therefore, as a method for solving these problems, a so-called dynamic load / unload type floating magnetic head in which a slider on which the magnetic head is mounted is activated and stopped without contacting the magnetic disk has been proposed. There is. In this method, the slider is floated or released on the magnetic disk in a non-contact manner by appropriately selecting the loading / unloading speed of the slider and the initial posture of the slider. As a method thereof, when information is not recorded or reproduced, the suspension supporting the slider is supported by a rod-shaped or plate-shaped (may have an inclination) support body at a predetermined distance from the magnetic disk. It is a mainstream to provide a predetermined slider load speed and slider initial posture at the time of start-up to separate the slider from the support, and at the time of stop, return the suspension supporting the slider back to the support to support it.

[0010]

However, immediately after the above-mentioned dynamic loading / unloading type flying magnetic head startup operation, the distance between the slider and the magnetic disk is considerably far from the slider flying distance. Therefore, the slider immediately after the start-up operation is in a state of dropping toward the predetermined flying position on the magnetic disk after being detached from the support. In addition, immediately after the start-up operation, the airflow due to the rotation of the magnetic disk is not yet sufficiently generated, so the slider in the levitating state is not sufficiently supported by the airflow, and it is very easy to vibrate and unstable. is there. Therefore, when performing the above-described submicron level levitation using the dynamic load / unload type levitation magnetic head, there is a probability that the slider and the magnetic disk will come into contact immediately after the start-up operation. Can be damaged.

Therefore, the present invention has been proposed in view of the above situation, in which a slider having a magnetic head mounted thereon starts and stops in a non-contact manner with respect to a magnetic disk.
In a disk drive device that uses a so-called dynamic load / unload type floating magnetic head, a slider has achieved low flying at a submicron level and enables high-density recording. An object of the present invention is to provide a disk drive device capable of preventing these damages due to contact, improving stability of the flying distance of a slider at the time of recording / reproducing information, and stably / certainly recording / reproducing information. And

[0012]

In order to achieve the above object, the present invention provides a magnetic disk mounted on a magnetic disk on which a slider having a magnetic head mounted thereon starts and stops in a non-contact manner. In a disk drive device that moves in the radial direction of to record and reproduce information, the magnetic disk has an area having a groove portion between each recording track and a flat area, and starting and stopping of the slider are
It is characterized in that it is performed in the plane area.

In a so-called discrete track medium having a groove portion between each recording track of the magnetic disk as described above, the magnetic film of the magnetic layer is divided by forming the groove portion, and when recording and reproducing information. Interference between recording tracks can be prevented. Therefore,
The recording track density can be improved and high density recording can be achieved. Further, in this magnetic disk, it is possible to prevent interference between recording tracks during recording and reproduction of information, so that the output characteristics and the overwrite characteristics are improved.

[0014]

[Function] The distance between the slider and the magnetic disk is determined immediately after the start operation of the dynamic load / unload type floating magnetic head in which the slider on which the magnetic head is mounted starts and stops without contacting the magnetic disk. The slider is considerably distant from the flying distance, and the airflow due to the rotation of the magnetic disk is not sufficiently generated, so that the slider is apt to vibrate and is unstable. Therefore, when using the floating magnetic head of the dynamic load / unload type to fly at the submicron level, there is a possibility that the slider and the magnetic disk will contact immediately after the startup operation, and the magnetic disk or slider may be damaged. There is a nature.

In the present invention, the magnetic disk has a shape having an area having a groove portion between each recording track and a flat area and the slider is started and stopped in the flat area. Contact can be prevented, and damage to the slider and magnetic disk due to contact can be prevented. In addition, the stability of the slider flying distance is also improved.

Further, as the magnetic disk, a kind of discrete track medium having a planar area having an area having a groove portion between recording tracks is used to prevent interference between the recording tracks at the time of recording and reproducing information. Therefore, the recording track density can be improved, and high density recording can be achieved.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disk drive device to which the present invention is applied will be described below with reference to the drawings.

First, the structure of the floating magnetic head of the dynamic load / unload type will be described. The dynamic load / unload type flying magnetic head is
As shown in FIG. 1, a magnetic head 1 is mounted on a slider 2 which has an air bearing surface whose main surface is processed with rails. The slider 2 is a flexible leaf-spring-shaped gimbal. The suspension 5 is fixed by the fixing portion 3a of the suspension 3, and the gimbal 3 and the load beam 4 form a suspension 5. A pivot 4b is provided at the free end of the load beam 4. Further, the load beam 4 is attached by a fixed portion 6a on the lower surface of the actuator arm 6, and moves in the radial direction in a plane parallel to the surface of the magnetic disk 7.

FIG. 2 shows a state in which the magnetic head 1 mounted on the slider 2 is not recording or reproducing information. As described above, the slider 2 on which the magnetic head is mounted is fixed to the suspension 5, and these are fixed to the actuator arm 6, and move in the radial direction in the plane parallel to the surface of the magnetic disk 7. As shown in the figure, when the slider 2 having the magnetic head mounted thereon is not recording or reproducing information, the suspension 5 supporting the slider 2 has a plate shape, a rod shape, or a plate shape having an inclined surface (this embodiment). In the example, the slider 2 having a magnetic head mounted thereon is supported by a support body 8 having a rod shape or the like, and has a predetermined height above the surface of the magnetic disk 7 (usually larger than a predetermined slider flying distance). Supported.

When the magnetic head 1 mounted on the slider 2 records / reproduces information on / from the magnetic disk 7 (at start-up), the suspension 5 supporting the slider 2 is used.
Slides on the support 8 and moves away from the support 8 as shown in FIG. 1, and the slider 2 moves on the magnetic disk 7. Then, the slider 2 having the magnetic head 1 mounted thereon moves to a predetermined recording track while recording and reproducing information while maintaining a predetermined flying distance. Further, when stopped, the suspension 5 supporting the slider 2 returns to above the support 8 and is supported by the support 8.

Since the floating magnetic head of the dynamic load / unload type has the above-mentioned structure,
Immediately after the start-up operation of the flying magnetic head, the distance between the slider and the magnetic disk is much larger than the flying distance of the slider, and after the slider is detached from the support, it drops toward the predetermined flying position on the magnetic disk. It will be in a state like. In addition, immediately after the start-up operation, the airflow due to the rotation of the magnetic disk is not yet sufficiently generated, so the slider in the floating state is not sufficiently supported by the airflow, and it is very easy to vibrate and unstable. .. In other words, when the dynamic load / unload type flying magnetic head is used to fly at the sub-micron level as described above, there is a probability that the slider and the magnetic disk will come into contact immediately after the start-up operation. Can be damaged.

Therefore, in order to prevent contact between the slider and the magnetic disk immediately after the start-up operation, the slider immediately after the start-up operation should be provided with a flying distance larger than the slider flying distance at the time of recording / reproducing information. Since the flying position is gradually approached, contact between the slider and the magnetic disk can be prevented.

On the other hand, the inventors of the present invention levitated the slider on the discrete track medium having the groove portions between the recording tracks as described above, and the flying distance of the slider changed depending on the depth of the groove between the recording tracks. I found that It is shown schematically in FIG. In FIG.
Magnetic disk 7 which is a discrete track medium
The depth of the inter-recording track groove 7a is 2δ, and the flying distance of the slider 2 is h. As shown in FIG. 3A, when the inter-recording track groove 7a is shallow, the slider flying distance h is large, and as shown in FIG. 3B, when the inter-recording track groove 7a is deep. The slider flying height h is small.

Therefore, in order to investigate the relationship between the groove depth between recording tracks of the discrete track medium and the flying distance, the groove depth between recording tracks is changed, and the change in the upward force that determines the slider flying distance at this time is simulated. did. This result is shown in FIG. 4 as a relationship between δ / h ₁ which is a function of the load capacity W and the groove depth 2δ between recording tracks. The load capacity W originally indicates an upward force applied to the slider, but here, it is indicated by a load load applied to the slider in order to maintain a constant flying distance h ₁ . As can be seen from the figure, δ / h ₁ which is a function of the groove depth 2δ between recording tracks increases, that is, the groove depth 2δ between recording tracks increases.
The load capacity W is decreasing as is increased. In other words, this means that the slider flying distance that allows the slider to fly is decreasing. That is, when a groove is formed between recording tracks, the slider flying height decreases as the groove depth increases. In other words, when the slider flying conditions such as the magnetic disk radius and the rotation speed are the same, The slider flying height on a normal disk with no grooves formed between tracks is
It can be said that it is larger than the slider flying distance on a discrete track medium in which grooves are formed between recording tracks.

Therefore, as described above, in order to prevent contact between the slider and the magnetic disk immediately after the start-up operation when the floating magnetic head of the dynamic load / unload type is used, the slider just after the start-up operation is used. It is sufficient to give a flying height that is larger than the flying height of the slider at the time of recording / reproducing information. From the above, a flat area is created in the discrete track media, and the start / stop operation of the slider is performed in this flat area. You can do it in.

Generally, the start and stop of the slider is carried out in a predetermined area in the magnetic disk, a so-called loading zone. Therefore, this loading zone may be set as the above-mentioned plane area. As an example, FIG. 5 shows a case where a loading zone is provided in the outer peripheral portion.
As shown in the figure, the magnetic disk 7 has a shape having a data zone 7b having a groove 7a between recording tracks on the inner peripheral portion and a loading zone 7c which is a flat area on the outer peripheral portion.

The loading zone can be set at any position as long as it is in the slider floating area in the magnetic disk. Also, the size of the area may be set so that the air bearing surface of the slider always exists in the loading zone. That is,
As shown in FIG. 6, the slider 2 has one main surface rail-processed as described above to form a groove 2a, and the bottom surface 2b thereof serves as an air bearing surface. A ridge portion 2c is formed on the outer peripheral side of 7 and a ridge portion 2d is formed on the inner peripheral side thereof.
When the edges 2e and 2f are formed on the inner peripheral side and the edges 2g and 2h are formed on the outer peripheral side and the inner peripheral side of the other mountain portion 2d, respectively, the loading zone 7c is at least the edge 2.
It has a width equal to or larger than the width of the area sandwiched between f and 2g, and preferably equal to or larger than the width of the area sandwiched between the edges 2e and 2h. The width of the loading zone is edge 2
If the width is smaller than the width of the region sandwiched between f and 2g, the slider cannot be provided with a sufficient upward force, and the flying stability of the slider is impaired. In order to further improve the floating stability of the slider, the width of the loading zone may be made larger than the width of the region sandwiched between the edges 2e and 2h. This is because an upward force that is stronger than that in the data zone is applied to the entire bottom surface of the slider, so that the flying stability of the slider is further improved.

Therefore, in a disk drive device using a dynamic magnetic load / unload type floating magnetic head, a kind of discrete track medium having a loading zone which is a flat area and an area having a groove portion between recording tracks as a magnetic disk. By using, it is possible to give the slider a larger flying height than the slider flying distance in the data zone at the time of startup, so even if the predetermined slider flying distance is a submicron level low flying distance, the startup operation Immediately after that, the slider and the magnetic disk do not come into contact with each other, and it is possible to prevent these damages due to contact. Furthermore, it is possible to improve the stability of the flying distance of the slider when recording / reproducing information, and to record / reproduce information in a stable and reliable manner.

Furthermore, by using a kind of discrete track medium having a region having a groove portion between each recording track as the magnetic disk, it is possible to prevent interference between the recording tracks when recording and reproducing information, The recording track density can be improved, and high density recording can be achieved.

Further, by additionally using the method of increasing the rotation speed of the magnetic disk when the slider is started and stopped, the flying distance of the slider in the loading zone at the time of starting is further increased, and the contact with the magnetic disk is more effective. It is possible to prevent it.

[0031]

As is apparent from the above description, the slider on which the magnetic head is mounted starts and stops in a non-contact manner with respect to the magnetic disk, and moves on the magnetic disk in the radial direction of the magnetic disk. In a disk drive device for recording and reproducing information, the shape of the magnetic disk has a shape having an area having a groove portion between each recording track and a flat area, and the starting and stopping of the slider is performed in the flat area. Therefore, even if the predetermined flying height of the slider is a sub-micron low flying distance, it is possible to prevent these damages due to the contact between the slider and the magnetic disk immediately after the slider is activated, and the slider can be It is possible to improve the stability of the levitation distance and record or reproduce information in a stable and reliable manner.

Further, by using a kind of discrete track medium having a region having a groove portion between each recording track as the magnetic disk, it is possible to prevent interference between the recording tracks at the time of recording and reproducing information, The recording track density can be improved, and high density recording can be achieved.

Furthermore, the disk drive device of the present invention has very high durability because the slider on which the magnetic head is mounted is started and stopped without contacting the magnetic disk. Therefore, it is possible to mount a low flying slider with a slider flying distance of submicron level on a small model such as a laptop or a notebook type personal computer that is highly disturbed when the engine is stopped, which is extremely industrial.

[Brief description of drawings]

FIG. 1 is a side view showing the configuration of a dynamic load / unload type flying magnetic head.

FIG. 2 is a plan view showing the structure of a dynamic load / unload type flying magnetic head.

FIG. 3 is a schematic diagram showing a relationship between a groove depth between recording tracks of a discrete track medium and a slider flying distance.

FIG. 4 is a characteristic diagram showing a relationship between a groove depth between recording tracks of a discrete track medium and a load capacity.

FIG. 5 is a sectional view showing an embodiment of a discrete track medium in a disk drive device to which the present invention is applied.

FIG. 6 is an enlarged schematic view showing a facing portion of a discrete track medium and a slider in a disc drive device to which the present invention is applied.

[Explanation of symbols]

 2 ... Slider 5 ... Suspension 6 ... Actuator arm 7 ... Magnetic disk 7b ... Data zone 7c ... Loading zone 8 ... Support

Claims (1)

[Claims] 1. A disk drive device in which a slider having a magnetic head mounted thereon starts and stops in a non-contact manner with respect to a magnetic disk and moves on the magnetic disk in a radial direction of the magnetic disk to record and reproduce information. 2. The disk drive device according to claim 1, wherein the magnetic disk has an area having a groove portion between each recording track and a plane area, and the start and stop of the slider are performed in the plane area.