JPH03216887A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To gather fine dust by arranging a spoiler, to which a filter is attached, in the vicinity of a magnetic disk. CONSTITUTION:Spoilers 12 which are stood on the side face of a filter storage part 8 and are arranged between magnetic disks 6 are provided with through- holes, and filters 14 are provided to close through-holes. Spoilers 12 o which filters 14 are attached are arranged in the vicinity of magnetic disk in this manner, and thereby, a part of the air current due to rotation of magnetic disks can directly pass in filters. Thus, fine dust which is difficult to remove can be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic disk device that takes measures against dust and corrosion.

2. Description of the Related Art In recent years, with the development of electronic computers, there has been a demand for higher density and larger capacity magnetic disks. Conventional magnetic disk drives use the Contact StartStop method (hereinafter referred to as C).
(abbreviated as SS) is used. The CSS method rotates the magnetic disk with the magnetic disk and magnetic head in contact when the magnetic disk device starts operating, and generates dynamic pressure between the magnetic disk and the magnetic head.
This is a method in which the magnetic head and the magnetic disk are made to float with a certain gap between them, and when the magnetic disk device finishes its operation, the magnetic disk is stopped with the magnetic disk and the magnetic head in contact with each other. However, with this method, there is a risk that dust generated from internal parts of the device may get stuck in the flying gap between the magnetic head and the magnetic disk while the magnetic head and magnetic disk are rubbing against each other, damaging the magnetic head and the magnetic disk. Also, lubricants such as grease are used in the bearings of the motors and spindles that rotatably support the magnetic disks.
The grease scatters and adheres to the magnetic disk, contaminating the lubricant on the surface of the magnetic disk that lubricates the magnetic head. In order to remove these dust particles and debris from the lease, etc., they adhere to the flying surface of the magnetic head and prevent the magnetic head from flying stably. there were.

FIG. 7 is a 1,000-sided diagram showing a conventional magnetic disk device.

In FIG. 7, 1 is an arm, and the arm 1 is rotatably attached to a shaft 2.

A bobbin (not shown), which is a component of the voice coil motor 3, is provided at one end of the arm 1. Further, a flexure 4 is attached to the other end of the arm 1. Reference numeral 5 denotes a floating slider attached to the tip of the flexure 4 via a gimbal (not shown), and the floating slider 5 is equipped with a head section for performing magnetic recording and reproduction. Is 6 a magnetic disk? The magnetic disk 6 is driven by a spindle motor. 7 is a filter device, and the filter device 7 is constructed as shown in FIG. In FIG. 8, reference numeral 8 denotes a filter storage section installed near the magnetic disk, and the filter storage section 8 is provided with an opening 8a, through which the air flow generated by the rotation of the magnetic disk 6 flows. It is set up to face the direction. Further, a filter 9 for adsorbing dust is provided in the filter storage section 8. 10 is a spoiler installed on the side of the filter storage part 8, and spoiler 1o is a spoiler installed on the side of the filter storage part 8.
placed in between. This spoiler 10 is provided in order to disrupt the airflow generated by the rotation of the magnetic disk 6 when the magnetic disk 6 is rotating, scatter dust in the airflow, and improve the dust collection ability of the filter 9. It is being

Problems to be Solved by the Invention However, in the conventional configuration described above, although a filter device is used to collect dust, even small dust cannot be removed. This is the magnetic disk 6 by the spoiler 1o.
Although the dust collection efficiency was improved by agitating the air flow formed on the surface of the filter, it is thought that this is because small dust particles are too diffused due to the agitation of the air flow and are not properly captured by the filter 9. If the distance between the magnetic disk 6 and the flying slider 5 (hereinafter referred to as the flying height) when the flying slider 5 is floating above the magnetic disk 6 is the same as the conventional distance, the above-mentioned small dust will fall on the flying slider 5. However, as the flying height has been reduced in recent years to improve recording density, the above-mentioned small particles have been placed between the flying slider and the magnetic disk 6, causing a crash. It got stuck in between the parts and caused a crash.

The present invention solves the above-mentioned conventional problems, and aims to provide a magnetic disk device that can trap small dust particles.

Means for Solving the Problem To achieve this objective, a spoiler with a filter attached was placed near the magnetic disk.

Function: This configuration allows a portion of the airflow generated by the rotation of the magnetic disk to pass directly through the filter.

EXAMPLE Hereinafter, an example of the present invention will be explained using FIGS. 1(a) and (b). FIGS. 1(a) and 1(b) are a plan view and a side view of a magnetic disk device according to an embodiment of the present invention. In the figure, 1 is an arm, 2 is a shaft, 3 is a voice coil motor, 4 is a flexure, 5 is a floating slider, and 6 is a magnetic disk, which are the same as the conventional structure shown in FIG.

11 is a filter device, and the filter device 11 is constructed as shown in FIG. In FIG. 2, 8 is a filter housing, 8a is an opening, and 9 is a filter, which are the same as the conventional structure. Reference numeral 12 denotes a spoiler erected on the surface of the filter housing 8 and disposed between the magnetic disks 6, and the spoiler 12 is provided with a through hole 13. Further, a filter 14 is provided in the spoiler 12 so as to close the through hole 13.

How the air flow on the surface of the magnetic disk is changed by the spoiler l2 configured in this manner will be explained below with reference to FIG. 3. Spoiler 1 as shown by arrow A in Figure 3
The air is stirred by the filter 2, and the air flows into the filter 14 as shown by arrow B in FIG. That is, dust such as lubricant, sealant, metal powder, etc. in the air that has passed through the filter 14 is removed from the filter 14.
be captured by Therefore, like a conventional spoiler, it not only diffuses the airflow flowing on the surface of the magnetic disk 6 and removes the dust in the diffused air by the filter 9 housed in the filter housing part 8, but also Dust in the airflow flowing over the surface of the disk 6 can be removed directly by the filter 14.

As described above, in this embodiment, the spoiler 12 is provided with the through hole 13, and the filter 14 is provided so as to block the through hole 13.
By providing this, a part of the air flow flowing on the surface of the magnetic disk 6 passes through the filter 14, so that fine dust can be removed.

Note that it is desirable to change the types of filters 14 and 9 depending on the usage environment in the following cases.

For example, magnetic disk drives installed in laptop computers, word processors, etc. are often used in corrosive gas atmospheres such as (poly)nitrogen oxide gas, (sulfurous acid) gas, and chlorine gas. Since there is a risk that the thin metal film magnetic disk in the disk device will be corroded by the gas, resulting in data destruction, in such a case it is preferable to make one of the filters 9 and 14 a corrosive gas adsorption fiber. .

Further, when a magnetic disk drive is used in a low humidity environment with a relative humidity of about 40% or less, it becomes easily charged with static electricity, and dust tends to adhere to the magnetic disk and magnetic head due to the electrostatic force. As a result, dust may get mixed in between the magnetic disk and the magnetic head, causing a crash. In this case, it is preferable to use antistatic fiber for preventing static electricity as one of the filters 9 and 14.

Furthermore, by using a filter for removing dust, corrosive gas adsorption fibers, and antistatic fiber for preventing static electricity together as a filter, it is possible to remove even fine dust with good corrosion resistance. As an example, a combination can be considered in which the filter 9 is made of corrosive gas adsorption fibers and antistatic fibers for preventing static electricity, and the filter 14 is made of a dust removal filter. These selections must be made depending on the circumstances under which the magnetic disk device will be used.

In order to verify the effects of this embodiment, test results comparing this embodiment with a conventional example, that is, a magnetic disk drive in which no filter is attached to the spoiler, will be explained. During the test, assuming high-density recording, the flying height of the flying slider 5 was set to 0.
．． The thickness was set to 1 μm.

Comparative Example 1: When a chargeable nonwoven fabric, which is a filter fiber for dust removal, is attached to the spoiler Test conditions:
CSS was performed 100,000 times under a Classloooo environment at a temperature of 25° C. and a relative humidity of 60%. During the test, the starting torque of the spindle motor was measured every 20,000 times CSS.

Figure 4 shows the comparison results. FIG. 4 is a characteristic diagram showing the relationship between the starting torque of the spindle motor and the number of CSSs, and it can be seen that this embodiment is superior to the conventional example. Furthermore, when the magnetic disk 6 was observed under a microscope after the test, in the conventional example, 2 to 3 dust particles/cm were observed and scratches caused by CSS were observed, but in this example, no abnormalities were observed as before the test. It wasn't done.

Comparative Example 2: When a graphite-containing fiber, which is an antistatic fiber for preventing static electricity, is attached to a boiler Test conditions: CSS was performed 100,000 times in a constant temperature chamber at a temperature of 23° C. and a relative humidity of 10%. During the test, the starting torque of the spindle motor 3 was measured every 20,000 times CSS.

FIG. 5 shows the comparison results. FIG. 5 is a characteristic diagram showing the relationship between the starting torque of the spindle motor and the number of CSSs. It can be seen that, like Comparative Example 1, this example is excellent. Further, after the test, when the floating slider was observed under a microscope, many dust particles were observed and scratches were observed in the conventional example, but in this example, only some dust particles were attached to the side surface of the floating slider.

Comparative Example 3: When nitrocellulose, which is the gas adsorption fiber 6, is attached to the hollow boiler 5 Test conditions: Temperature 2
It was left in an atmosphere of 5° C., relative humidity 70%, and 1 ppm chlorine for 50 days. The disk is rotating at 3600 rpm. During the test, the error bits of the magnetic disk 6 were measured every 10 days.

Figure 6 shows the comparison results. FIG. 6 is a characteristic diagram showing the relationship between the number of days of storage and the number of error bits on the magnetic disk 6. It can be seen that this example is superior. In addition, when the magnetic disk 6 was observed under a microscope after the test, many corroded parts were observed in the conventional example, and when the corroded substances were analyzed, chlorine was detected, but in this example, it was the same as before the test, and there was no abnormality. was also not detected.

As described above, in this embodiment, the spoiler 12 provided between the magnetic disks 6 is provided with the through holes 13, and the through holes 1
By providing a filter 14 to block the air filter 3, it is possible to capture small dust particles without dispersing them, so even if the flying height is small, it is possible to prevent damage to the flying slider or magnetic disk. . Corrosive gases can also be removed by using a corrosive gas adsorbent in the filter.

Effects of the Invention In the present invention, by arranging a spoiler with a filter attached near the magnetic disk, a part of the airflow generated by the rotation of the magnetic disk can directly pass through the filter. Shoes can also be removed.

[Brief explanation of drawings]

A top view and a side view, Fig. 2 is a configuration diagram of a boiler attached to a filter, Fig. 3 is a partially enlarged view showing the air flow in this example, and Fig. 4 is a diagram showing the spindle motor's performance with respect to the number of CSSs in Comparative Example 1. Figure 5 is a diagram showing the relationship between the starting torque of the spindle motor and the number of CSSs in Comparative Example 2. Figure 6 is a diagram showing the relationship between the magnetic disk leaving time and the magnetic disk error in Comparative Example 3. FIG. 7 is a plan view showing a conventional magnetic disk device, and FIG. 8 is a partially enlarged view showing a filter device. 1... Arm 2... Shaft 3... Voice coil motor 4... Flexure 5... Levitation slider 6... Magnetic disk 8...Filter housing 8a...Opening 9...Filter 11...Filter device l2...Spoiler 13... ...Through hole 14...Filter

Claims (3)

[Claims] (1) A magnetic disk, a driving means for driving the magnetic disk, an arm that moves parallel to the magnetic disk, a flexure attached to the arm, and a slider attached to the flexure via a gimbal. A magnetic disk drive comprising: a spoiler disposed near the magnetic disk and having a through hole; and a filter held by the spoiler so as to block at least a portion of the through hole. (2) The magnetic disk device according to claim 1, characterized in that a corrosive gas adsorption fiber is used as the filter. (3) The magnetic disk device according to claim 1, wherein an electrostatic fiber for preventing static electricity is used as the filter.