JPH05182442A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To provide the magnetic disk device which effectively prevents the entering of dust and can prevent the clogging of breeze filters. CONSTITUTION:The device has a hermetic container 9 housing a spindle hub fixed to a revolving shaft driven by a motor, magnetic disks 4 mounted on the spindle hub and a magnetic head positioning mechanism mounted on the magnetic head 5 facing the disk surfaces of the magnetic disk 4. The device has at least one of respiration holes 3 provided in the hermetic container a and the breeze filters a, b for preventing the entering of the dust from the outdoor air. Another breeze filters a, b varied in filtration rate are fixed to the inner side of these breeze filters a, b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device having a breathing hole.

[0002]

2. Description of the Related Art Conventionally, in a magnetic disk device, a magnetic head 55 mounted on a carriage 56 driven by a voice coil motor 57 floats on a magnetic disk 54 which is rotated at a high speed by a spindle motor 58 as shown in FIG. Then
Information is recorded and reproduced in the closed container 59. When the magnetic disk device is stopped, the magnetic head 55 is in contact with the magnetic disk 54 and stopped. Further, the closed container is provided with a breathing hole 53 in order to minimize the pressure difference between the inside and the outside, and the please filter 1 is fixed to the breathing hole in order to prevent dust from entering from the outside.

[0003]

The above-mentioned conventional magnetic disk device has a hermetically sealed structure, keeps the cleanliness inside, and has a please filter in the breathing hole in order to prevent dust from entering from the outside. It is stuck. On the other hand, there is dust with a fine particle size that cannot be captured even by the please filter, and these dusts may enter the device. In this case, dust may enter the gap between the magnetic disk that is housed in the device and rotates at a high speed and the magnetic head that is floating above the magnetic disk, and the magnetic disk and the magnetic head may be damaged. There was a problem that it caused a crash failure. It is also possible to use a please filter with a high filtration rate to prevent the entry of minute dust, but in this case the please filter may cause clogging and block breathing holes, so the filtration rate Those with a high value were difficult to use.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic disk device which can improve the disadvantages of the prior art, and particularly can effectively prevent dust from entering and prevent clogging of the please filter. To do.

[0005]

According to the present invention, a spindle hub fixed to a rotary shaft driven by a motor, a magnetic disk mounted on the spindle hub,
The airtight container is provided with a magnetic head positioning mechanism having a magnetic head facing the disk surface of the magnetic disk, and at least one breathing hole is provided in the airtight container, and dust from the outside air is fixed to the breathing hole. The structure has a please filter for preventing the entry of the above and also has another please filter fixed to the inside of this please filter with a different three-pass rate. This aims to achieve the above-mentioned object.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, a closed container 9 of the magnetic disk device
The please filter 1 is fixed to the inside of the breathing hole 3 provided in the above, and another please filter 2 is further fixed to the inside thereof. The please filters 1 and 2 cover the breathing hole 3 with a filter medium portion, and the outer periphery of the filter medium is a closed container 9.
It is fixed by glue or adhesive so that there is no gap. The please filter 1 and the please filter 2 are not in contact with each other and are spaced apart to some extent.

During operation of the magnetic disk device, since the spindle motor 8 having the magnetic disk 4 shown in FIG. 1 rotates at high speed, a pressure difference occurs between the inside and outside of the closed container 9 and the inside of the closed container 9 from the breathing hole 3. The air comes in. At this time, the dust contained in the outside air is captured by the please filter 1 so as not to enter the closed container 9, but there is also dust that cannot be captured even by the please filter 1 and passes through the please filter 1. The please filter 2 captures the passing dust.

That is, even if the please filter 2 cannot catch the dust in the outside air, the please filter 2 also catches the dust, so that the dust can be prevented from entering the closed container 9 and the cleanliness of the closed container 9 can be maintained. You can do it. Further, if the filtration rates of the filter media of the please filters 1 and 2 are the same, there is a possibility that dust that could not be captured by the please filter 1 may not be captured by the please filter 2, and therefore the filtration rate of the please filter 1 may be increased. Use low filter media,
If a filter material having a high filtration rate is used for the please filter 2, dust with a large particle size can be captured by the please filter 1, and dust that cannot be captured by the please filter 1 with a small particle size can also be captured by the please filter 2, so it is sealed. It is possible to prevent dust from entering the container 9, and also to prevent clogging of the please filters 1 and 2.

Polyester glass fiber is usually used as the filter material of the please filters 1 and 2, but even a filter material having a high filtration rate may not be able to capture fine dust. In this case, if an electrostatic type filter material is used for the please filter 2, it becomes possible to capture even dust with a minute particle size that cannot be captured by the electrostatic effect. In other words, even if some dust is captured by the please filter 1 and passes through the please filter 1, the please filter 2
Because it can be completely collected by
It is possible to almost completely prevent dust from entering the inside. Therefore, since the cleanliness of the closed container 9 can be maintained, damage to the magnetic disk 4 and the magnetic head 5 can be prevented.

[0010]

As described above, according to the present invention,
Completely prevent dust from entering the airtight container by adopting a double structure of a please filter to prevent dust from being contained in the air through the breathing hole, using members with different triple ratios. In addition, since it is possible to prevent the blocking of the breathing holes due to the clogging of the please filter, it is possible to maintain the cleanliness inside the magnetic disk device, prevent damage to the magnetic disk and magnetic head, and improve the reliability of the magnetic disk device. It is possible to provide an excellent magnetic disk device which is not possible in the past.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a conventional example.

[Explanation of symbols]

 1 Please filter (a) 2 Please filter (b) 3 Breathing hole 4 Magnetic disk 5 Magnetic head 6 Carriage 7 Voice coil motor 8 Spindle motor 9 Airtight container

Claims (3)

[Claims] 1. A spindle hub fixed to a rotating shaft driven by a motor, a magnetic disk mounted on the spindle hub, and a magnetic head positioning mechanism having a magnetic head facing the disk surface of the magnetic disk. And a breathing hole provided at least one in the closed vessel, and a please filter for preventing dust from entering from the outside air by being fixed to the breathing hole. A magnetic disk device characterized in that another please filter having a different rate is fixed. 2. The double-fixed please filter is characterized in that the please filter having a low filtration rate of the filter medium is fixed to the outside and the please filter having a high filtration rate of the filter medium is fixed to the inner side. Item 1. The magnetic disk device according to item 1. 3. The magnetic disk drive according to claim 1, wherein in the double-fixed please filter, the filter material of the inner please filter is of an electrostatic type.