JPS62180563A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To lower the height of the device and make the unit small by providing a breather for adjusting internal pressure in the shaft of a spindle motor, and installing an air filter on the upper face of a rotary driving hub. CONSTITUTION:A disk plate 4 and a spindle motor 5 are fixed to a base plate 3, and sealed by a top cover 2. An air filter 1 is attached to the upper face of a driving hub 6 and rotated by a magnet 8 in the driving hub 6 and a core 9 fixed to a shaft 12 making the hollow shaft 12 fixed to a housing 10 a rotation shaft. Air outside of the device containing dust passes inside of the shaft at a part (b) and enters the motor part in the driving hub 6. By sealing the lower part of the driving hub 6 with magnetic fluid seal 11, dust contained in outside air is filtered by an air filter 1 and the air enters inside of the device from a part (a) in the figure.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic disk drive, and in particular is characterized by the structure of an internal and external pressure adjustment mechanism that includes an air filter for internal pressure adjustment above the drive hub of a spindle motor. Regarding a certain magnetic disk device.

[Prior Art] As a conventional magnetic disk device, there is one shown in FIG. 3, for example. In the figure, 1 is an air filter for adjusting internal pressure, 2 is a top cover, 3 is a base plate,
4 is a disk plate, 5 is a spindle motor, and 6 is a drive hub. In this case, the air filter 1 for adjusting the internal pressure was located at the center of rotation of the disk plate 4 of the top cover 2. However, if it is installed in the above position, the height of the device will be high.
It was installed in the position shown in the figure.

That is, the air filter 1 is provided at a position offset from the center of rotation of the disk plate 4 of the top cover 2.

[Problems to be Solved by the Invention] It is desirable that the air filter for adjusting the internal pressure of a magnetic disk device be installed at the center of rotation of the disk plate, where the internal pressure is lowest during operation of the device. However, when installed in the above position, the height of the device becomes high, and miniaturization of the device becomes a problem.

Therefore, conventionally smaller magnetic disk drives have been installed at a position offset from the center of rotation as shown in Figure 4, but in this position, the internal pressure during operation of the device does not become so low that the initial purpose cannot be achieved. There was a problem.

[Means for Solving the Problems] The present invention has been made by focusing on the above-mentioned conventional problems, and the height of the device can be kept low by providing an air filter at the center of rotation of the disk plate. , the device can be made more compact, the air filter is not exposed outside the device, and the filter can be prevented from being torn due to external factors, and device failures caused by dust intrusion due to the air filter being torn can be eliminated, and the device can be It is an object of the present invention to provide a magnetic disk device that can improve reliability.

To this end, the present invention provides a magnetic disk drive equipped with an air filter for preventing dust from entering from the outside, a breathing hole for adjusting internal pressure, and a spindle motor.
The present invention provides a magnetic disk drive characterized in that it has a spindle motor that has the breathing hole in its shaft and is installed on the upper surface of a drive hub that rotates the air filter.

[Example] Next, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a disk plate 4 and a spindle motor 5 of a magnetic disk device.

The disk plate 4 and the spindle motor 5 are connected to the base plate 3
and is sealed by a top cover 2. Air enters and exits only through the air filter 1 due to the difference in air pressure between the inside and outside of the sealed container.

FIG. 2 will be explained below.

Air filter 1 is attached to the top of the drive hub,
A hollow shaft 12 fixed to the housing 1O serves as a rotating shaft, and is rotated by a magnet 8 inside the drive hub 6 and a core 9 fixed to the shaft 12.

The air outside the device containing dust passes through the inside of the shaft from part b and enters the motor part inside the drive hub 6. By sealing the lower part of the drive hub 6 with the magnetic fluid seal 11, air can enter and exit the inside of the drive hub 6 and the sealed container only through the upper part of the air filter 1.

Therefore, air containing external dust passes through the inside of the shaft 12 from part b, enters the inside of the drive hub 6, filters dust by the air filter 1 in part L, and enters the inside of the device from part a.

As described above, by providing the spindle motor with the function of adjusting the internal pressure, the space conventionally used to mount a filter can be used effectively, and the device can be made smaller.

[Effects of the Invention] As described above, the present invention provides a magnetic disk drive equipped with a spindle motor and a breathing hole for adjusting internal pressure, which has an air filter for preventing dust from entering from the outside. Since the magnetic disk device is characterized by having a spindle motor installed on the upper surface of a drive hub that rotates the air filter, the device has a spindle motor installed on the upper surface of a drive hub that rotates the air filter. It is possible to keep the height low, which has the effect of making the device more compact.

In addition, since the air filter is not exposed to the outside of the device, it is possible to prevent the filter from breaking due to external factors, eliminating the occurrence of device failures caused by dust intrusion due to air filter tears, and improving the reliability of the device. It has the effect of being able to

[Brief explanation of drawings]

1 is a sectional view of a spindle motor, a disk plate, and a part of an air filter for adjusting internal pressure of a magnetic disk device of the present invention; FIG. 2 is an enlarged sectional view of the spindle motor of FIG. 3; 4 and 4 are cross-sectional views of a spindle motor, a disk plate, and a portion of an air filter for adjusting internal pressure of a conventional magnetic disk device.

Claims (1)

[Claims] In a magnetic disk drive equipped with a spindle motor and a breathing hole for adjusting internal pressure, which has an air filter to prevent dust from entering from the outside, the breathing hole is provided in a shaft and the air filter is installed on the upper surface of a rotating drive hub. What is claimed is: 1. A magnetic disk device comprising a spindle motor.