JPH04339392A - Magnetic disk driving device - Google Patents

Abstract

PURPOSE:To improve dust eliminating speed by arranging the filter fitting part of a filter for circulating air to a corner nearest to a magnetic head part and providing a step-like recessed part on the inside wall of a casing. CONSTITUTION:The filter fitting part 15 is arranged to the corner nearest to the magnetic head 2 for the rotational direction of a spindle motor 6. Further, a step part is provided on the inside wall of the upper lid of a magnetic disk drive device housing 10 from the mobile part of a magnetic head arm 4 and a spindle motor 6 to the filter attaching part 15, a step-like housing recessed part is formed. Thus, since air flow is converged, the dust removing speed is improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive device that can remove dust inside the magnetic disk drive device at high speed and maintain excellent cleanliness.

0002

2. Description of the Related Art In recent years, various magnetic disk drive devices have been developed and proposed in line with the progress of the information society.

A conventional magnetic disk drive device will be explained below. FIG. 5 is a plan view of the interior of a conventional magnetic disk drive device, and FIG. 6 is a plan view of the top cover of the magnetic disk drive device. 1 is a magnetic disk on which information is recorded and reproduced; 2 is a magnetic head that records and reproduces information; 3 is a flexure that supports the magnetic head 2; 4 is a magnetic head arm that supports the flexure 3; 5 is a magnetic head that supports the flexure 3 through a bearing. An actuator 6 for moving the magnetic head 2 is a spindle motor. Positional information is recorded in advance on the magnetic disk 1, and this positional information is reproduced by the magnetic head 2, and the actuator 5 moves the magnetic head 2 to a target track at high speed and positions it with high precision. Further, the magnetic disk 1 is rotated by a spindle motor 6. 7 is a circulating air filter for removing dust in the magnetic disk device; 8
is the filter attachment part of the circulating air filter. The circulating air filter 7 only needs to be inserted into the filter mounting portion 8, and assembly can be easily performed. 9 is a locking mechanism for fixing the magnetic head arm 4 when the magnetic disk drive device is stopped; 10 is the above-mentioned 1 to 1;
This is a casing for hermetically storing each of the equipment elements of No. 9.

In FIG. 6, reference numeral 11 indicates a housing recess formed in the upper lid. In a magnetic disk drive device for large-capacity, high-density recording, it is necessary to position the magnetic head 1 to a target track with high precision, so the rigidity of the housing 10 is increased. Therefore, the wall thickness of the housing 10 is designed to be thick. However, as the capacity of magnetic disk drive devices continues to increase, it is necessary to store more magnetic disks in the magnetic disk drive device, so from the perspective of increasing capacity, the thickness of the casing of the magnetic disk drive device should be thinner. good. For these reasons, the housing recess 11 of the top cover is provided in the minimum necessary area, and is formed only in the movable part of the magnetic head arm 4 and the spindle motor 6. 12 is a breathing hole for adjusting the air pressure inside and outside the housing 10;
3 is a breathing filter attached to the breathing hole 12.

The operation of the conventional magnetic disk drive device configured as described above will be explained below. In the stopped state, the magnetic head 2 and the magnetic disk 1 are in contact with each other, and when the device is started, the magnetic disk 1 rotates and the magnetic head 2 generates a positive pressure on the slider surface, causing the magnetic head 2 to move over the magnetic disk 1 at approximately zero pressure. It floats with a flying height of 2 μm. After the magnetic head 2 floats, it moves in the radial direction and is positioned extremely precisely at a target track position, where information is recorded and reproduced. When the magnetic disk drive device is stopped, the rotation of the magnetic disk 1 is stopped and the magnetic head 2 is in contact with the magnetic disk 1. Furthermore, in order to eliminate the wobbling of the magnetic head arm 4 due to the bearing when stopped, the magnetic head arm 4 is fixed by a locking mechanism 9.

[0006] As described above, the magnetic head 2 and the magnetic disk 1 slide against each other when the magnetic disk drive device is started up and stopped, which may result in wear and dust generation. Similarly, since the magnetic head arm 4 and the locking mechanism 9 contact and slide, they wear and generate dust. Dust generated within the magnetic disk drive apparatus is removed by causing a part of the airflow generated as the magnetic disk 1 rotates to flow into the circulating air filter 7.

[0007]

[Problems to be Solved by the Invention] However, in the above-mentioned conventional configuration, since an air circulation flow occurs inside the housing recess, the dust generated when starting and stopping the magnetic disk drive device is discarded through the internal circulation of the housing recess. It is easy to get into the flow and difficult to get out. As a result, this dust has a problem in that it is difficult to reach the circulating air filter and difficult to remove. Further, in conventional magnetic disk drive devices, the flying height of the magnetic head is approximately 0.2 μm, and therefore, the design is not such that dust of 0.1 μm can be removed at high speed. Therefore, as the flying height of the magnetic head becomes lower due to the increase in capacity and high-density recording of magnetic disk drive devices, dust of about 0.1 μm, which did not pose a problem with conventional magnetic disk drive devices, is There is a problem in that the magnetic head gets in between the disks, damaging the magnetic head and the magnetic disk, leading to data destruction and causing a magnetic head crash. Similarly, if dust adheres to the magnetic disk, corrosion of the magnetic disk occurs, leading to data destruction, which impairs the reliability of the magnetic disk drive device.

[0008] The present invention solves the above-mentioned problems of the conventional technology, and removes even minute dust particles of about 0.1 μm at high speed, maintains excellent cleanliness, and prevents magnetic head crashes and magnetic disk corrosion. Suitable for high-density recording with large capacity without
It is an object of the present invention to provide a magnetic disk drive device that also has high reliability.

[0009]

[Means for Solving the Problems] In order to achieve this object, the magnetic disk drive device of the present invention has a structure in which the filter mounting portion of the circulating air filter is located in the housing closest to the magnetic head with respect to the rotational direction of the spindle motor. A housing concave portion having a filter mounting portion of a circulating air filter formed at a corner and a stepped portion formed on an inner wall of the housing such as an upper cover and a lower cover from the magnetic head driving portion and the spindle motor portion to the filter mounting portion. It has a configuration including the following.

0010

[Effect] With this configuration, by placing the filter mounting part at the position closest to the magnetic head in the rotational direction of the spindle motor, the rotating air flow prevents dust from dispersing, allowing air to flow with a high dust concentration. can be directed to a circulating airflow filter. As a result, the dust removal speed can be increased.

[0011] Furthermore, by extending the concave part of the housing of the magnetic disk drive device to the inlet of the filter for circulating air, it is possible to guide the internal circulating flow containing dust to the filter for circulating air, and also to converge the air flow. The air then enters the circulating airflow filter, further increasing the dust removal rate and maintaining cleanliness.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a magnetic disk drive device, and FIG. 2 is a plan view of the top cover of the magnetic disk drive device of the present invention.

1 is a magnetic disk, 2 is a magnetic head, 3 is a flexure, 4 is a magnetic head arm, 5 is an actuator, 6 is a spindle motor, and 10 is a housing, and since these are the same as in the conventional example, their explanation will be omitted. 14 is a circulating air filter; 15 is a circulating air filter 14 that is installed at a position closest to the magnetic head 2 with respect to the rotational direction of the magnetic disk 1 in order to guide air flow with a high dust concentration to the circulating air filter 14; Formed circulating air filter 1
4 is a filter attachment part, 16 is a circulating air filter 14
The housing recess of the top cover extends to the vicinity of the air inflow part,
12 is a breathing hole, and 18 is a breathing filter.

The total height of the circulating air filter 14 is the same as that of the housing 1.
It is preferable that the height of the filter mounting portion 15 is approximately the same as or higher than that of the filter mounting portion 15 of FIG. If the total height of the circulating air filter 14 is less than or equal to the total height of the filter attachment portion 15 of the housing 10, a gap may occur between the circulating air filter 14 and the housing 10. In this case, the air flow containing dust preferentially enters the gap, and the flow rate of air entering the circulating air filter 14 decreases, which is undesirable because the dust removal speed becomes low.

[0016] Therefore, it is desirable to use a circulating air filter 14 that is larger than the total height of the filter mounting portion 15 so that no gaps are formed.

The filter mounting portion 15 is arranged at the corner closest to the magnetic head 2 with respect to the rotating direction of the spindle motor 6, and the magnetic head is connected from the movable portion of the magnetic head arm 4 and the spindle motor 6 to the filter mounting portion 15. By providing a stepped portion 19 on the inner wall of the upper cover of the housing 10 of the disk drive device and forming a stepped housing recess 16, the air flow is converged, so that the dust removal speed can be increased.

The height of the stepped portion 19 of the housing recess 16 is approximately the same as that of the conventional example. Thereby, the air circulating flow inside the housing recess 16 can efficiently flow into the circulating air filter 7, and dust can be completely removed. Housing recess 1
6 may be provided only on the upper lid, but it is preferable to form it on the lower lid as well, since this further rectifies the circulating air flow and converges the circulating air flow to the filter 7 for circulating air.

A dust removal test and a continuous random seek test were conducted using the magnetic disk drive device of this embodiment configured as described above. (1) The dust removal test was conducted by measuring the time required to remove dust (hereinafter referred to as dust removal time). The dust removal time is determined by inserting 100 particles of 0.1 μm in size while the magnetic disk drive device is operating.
It was calculated based on the time it took for the number to decrease to one or less. The test results are shown in FIG. In FIG. 3, the vertical axis represents the number of dust particles inside the magnetic disk drive device, and the horizontal axis represents the dust removal time. (2)
In the continuous random seek test, 100 pieces of dust (±10 pieces) were always placed in the magnetic disk drive device of this example, and in this state, random seek was performed once per second. The number of data errors occurring in the magnetic disk drive device was measured every 1 million seeks, and was used as an index of reliability under long-term operating conditions. The test results are shown in FIG. In FIG. 4, the vertical axis represents the number of data errors in the magnetic disk drive device, and the horizontal axis represents the number of random seeks.

(Comparative Example) Using the conventional magnetic disk drive device shown in FIG. 5, a dust removal test and a continuous random seek test were conducted under the same conditions as in the example.

The results are shown in FIGS. 3 and 4, respectively. As can be seen from the dust removal test data in FIG. 3, the dust removal time was 8 seconds in the magnetic disk drive device of this embodiment and 18 seconds in the conventional example, and the dust removal time was less than half that of the conventional example. It can be seen that the removal efficiency is extremely high.

The reason why the dust removal efficiency of the conventional magnetic disk drive device is poor is considered to be that air with a low dust concentration flows into the circulating air filter 7.

Furthermore, as shown in FIG. 3, in the conventional magnetic disk drive device, as the number of remaining dust particles decreases, it becomes difficult to remove them by the circulating air filter 7. This causes a circulation flow of air within the housing recess 11,
This is because the dust inside the circulating flow is difficult to remove.

On the other hand, the magnetic disk device of this embodiment removes even the last piece of dust at high speed and completely. This means that when the magnetic disk drive device is started up, dust is quickly removed, and the magnetic head 2 and magnetic disk 1 are
This indicates that no dust has entered between the Therefore, a crash of the magnetic head 2 does not occur. Similarly, even when the magnetic disk drive device is stopped, no dust adheres to the magnetic disk 1, so data destruction due to corrosion of the magnetic disk 1 is extremely unlikely to occur.

Further, as can be seen from FIG. 4, the occurrence of data errors is small in this embodiment, while the conventional magnetic disk device has an extremely high occurrence of data errors.

In order to investigate the causes of data errors in conventional magnetic disk drive devices, microscopic observation and chemical analysis of the magnetic disk air bearing surface of the magnetic head 2 revealed that dust containing Si, Cl, Ca, etc. Co, Ni, C
The component composition of the magnetic disk 1, such as r, was detected. This is considered to be because dust enters between the magnetic head 2 and the magnetic disk 1 during random seek and damages the magnetic disk 1. Furthermore, when the magnetic head 2 moves over the scratched track during a seek operation, it is believed that the flying fluctuation occurs and comes into contact with the magnetic disk 1, causing the scratches to expand and data errors to increase. It will be done.

On the other hand, the reason why almost no data errors occur in the magnetic disk drive device of this embodiment is considered to be because dust is removed quickly.

[0028]

As described above, the present invention arranges the filter attachment part of the circulating air filter at the corner closest to the magnetic head part with respect to the rotational direction of the spindle motor, and the magnetic head arm movable part and the spindle motor part. By forming a step-like recess in the inner wall of the magnetic disk drive case from the top to the filter mounting part, the circulating air flow inside the case is rectified and the contact area of the circulating air filter is expanded, increasing the dust removal speed. can be increased.

As a result, regardless of whether the magnetic disk drive is in operation or stopped, the inside of the magnetic disk drive can always maintain an excellent clean condition, so there is no magnetic head crash or corrosion of the magnetic disk, and the flying height is low. It is possible to achieve high-capacity, high-density recording using a large number of magnetic heads.
Moreover, a highly reliable magnetic disk drive device can be realized. Moreover, it can be realized by an easy method without significantly changing the design of a conventional magnetic disk device.

[Brief explanation of drawings]

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

FIG. 2 is a plan view of the top cover of the magnetic disk drive device of the present invention.

[Figure 3] Comparison diagram of dust removal time

[Figure 4] Relationship diagram between number of seeks and number of data errors

[Figure 5]
Plan view of the inside of a conventional magnetic disk device

[Fig. 6] Plan view of the top cover of a conventional magnetic disk device

[Explanation of symbols]

1 Magnetic disk 2 Magnetic head 3 Flexure 4 Magnetic head arm 5 Actuator 6 Spindle motor 7, 14 Circulating air filter 8, 15 Filter mounting part 9 Lock mechanism 10 Housing 11, 16 Housing recess 12, breathing hole 13,18 Breathing filter 19 Step part

Claims (1)

[Claims] 1. A housing, a magnetic disk disposed within the housing, the magnetic disk driving means including a spindle motor, etc., and a magnetic head driving section that moves in the radial direction of the magnetic disk. A magnetic disk drive device comprising: a filter mounting portion for a circulating air filter formed at a corner of the housing closest to the magnetic head in the rotational direction of the spindle motor; and a magnetic head drive portion on the inner wall of the housing. and a housing recessed portion having a stepped portion formed across the spindle motor portion to the filter mounting portion.