JPH03187092A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To clean the magnetic disk surfaces by providing a dust sucking mechanism having plural openings opposite to the disk surfaces in a position between adjacent disks and forcibly exhausting the dust through these openings. CONSTITUTION:When the rotation of the magnetic disk 5 is raised, the pressure at a remote part from a spindle 1 is increased, while the pressure in the centripetal direction is decreased. Consequently, an airflow generated from protrusions of a spindle hub 2 and the disks 5 is circulated in the device to enter a gap of the low pressure hub and then to pass through a filter 13, so that a clean air-flow is supplied to the disks 5 and magnetic heads 6. Even when a dust amt. is increased and the dust should intrude into a minute gap between the disk 5 and the head 6, since the dust is forcibly sucked by the sucking mechanism 14 having plural openings through a pipe 16 with an exhausting mechanism, there is no infiltration of the dust into the minute gap between the disk 5 and the head 6 and the clean airflow is always supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and more particularly to a suction mechanism for dust in a sealed container housing a magnetic disk and a magnetic head.

[Conventional technology]

Conventionally, this type of magnetic disk device (hereinafter referred to as HDA)
As shown in FIG. 4, there is a spindle hub 2 attached to the spindle 1 integrated with a spindle motor 4, a disk clamp 3 that supports the stacked magnetic disks 5 on the spindle hub 2, and a magnetic head that performs recording and reproduction. 6 and
An arm 7 that holds the magnetic head 6, a carriage 8 that positions the magnetic head 6, and a desiccant assembly 11 that dehumidifies the internal air.
It is composed of a base plate 9 and a cover 10 that seal the air inside A. The magnetic head 6 is floated through a minute gap by the wind pressure of the airflow generated by rotating the magnetic disk 5 at 300 rpm or more via the spindle 1, and magnetic recording and reproduction are performed. A cover 10 on the top of the spindle 1 has a pre-filter 12 that measures the flow with outside air in order to avoid sudden pressure changes inside the HDA. A filter 13 is attached to the inside of the spindle hub 2.
3, the air flow is purified and supplied to the magnetic disk 5 and magnetic head 6.

[Problem to be solved by the invention]

In order to keep the inside of the HDA clean, the conventional HDA described above has a pre-filter 12 that has micro ventilation holes and is equipped with an activated carbon case that absorbs malignant gases, and a filter 13 that is bonded to the inside of the spindle hub 2. I was using it. In the parts of the magnetic disk 5 and magnetic head 6 where air cleaning is most required, a clean air flow is supplied through a filter bonded to the inside of the spindle hub 2 as the spindle rotates.

However, when the magnetic disk 5 comes into contact with the magnetic head 6 while the magnetic disk 5 is stopped, the rotational region for more than ten seconds when the wind pressure of the air flow during startup and stop is insufficient for the magnetic head 6 to fly, contact (contact star l-stop) occurs. :Hereafter referred to as C8S, a das 1~ occurs due to the spindle being turned on, and the spindle l
When the spindle l rotates and reaches steady rotation, dust may be generated from the gap in the bearing part of the spindle L. Also, when the magnetic head 6 records/reproduces, the carriage moves, and dust may be generated from the gap in the carriage bearing part. Dust may be generated, and dust may also be generated due to the diffusion of air currents generated when the magnetic disk rotates or the carriage moves, due to residual materials such as screw drills generated during HDA manufacturing. Due to these adverse conditions, the cleaning effect of the filter 13 is not fully demonstrated, and dust enters the minute gap between the magnetic disk 5 and the magnetic head 6, and the magnetic disk 5 and the magnetic head 6 are damaged through the dust.
This had the drawback of causing a crash, which was fatal to magnetic disk drives.

An object of the present invention is to provide a magnetic disk device that solves the above problems.

[Means to solve the problem]

In order to achieve the above object, the magnetic disk device according to the present invention includes a combination of a plurality of magnetic disks that are stacked and held on a spindle hub via disk spacers, and a magnetic head that performs recording and reproduction of the magnetic disks. A sealed magnetic disk device, which is housed in a sealed space,
The dust suction mechanism is located in a space between adjacent magnetic disks and has a plurality of openings facing the surface of the magnetic disk, and has an exhaust mechanism that forcibly exhausts dust from the opening in the top of the dust suction tIa. .

[Solid line example]

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a longitudinal cross-sectional view of one embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of the same, and FIG. 3 is a plan view showing a state in which a magnetic disk is removed.

In the figure, the magnetic disk device according to the present invention includes a spindle hub 2 that holds a plurality of magnetic disks 5 in a stacked manner via a disk spacer 3, a spindle motor 4 that rotationally drives the spindle hub 2 via a spindle 1, and a spindle motor 4 that rotationally drives the spindle hub 2 via a spindle 1. 1, a magnetic head 6 that is arranged coaxially at a certain distance and performs magnetic recording and reproduction;
an arm 7 for holding the magnetic head 6, a carriage 8 for positioning the magnetic head 6, a base plate 9 and a cover 10 for holding and enclosing these and sealing the internal air; a pre-filter 12 containing activated carbon that absorbs malignant gases, a desiccant assembly #11 that dehumidifies the air inside the HDA, and a magnetic disk 5.
The opening 14a for sucking in dust is installed at a small interval so as to face the surface of the opening 14a.

14b... and an exhaust mechanism 15 that forcibly exhausts the inside of the dust suction mechanism 14 through a pipe 16.

Next, the operation will be explained. When the spindle motor 4 integrated with the spindle 1 starts rotating, airflow generated by the fan principle from the protrusion of the spindle hub 2 integrated with the spindle 1 passes over the surface of the magnetic disk 5. . At the same time, due to the rotation of the magnetic disk 5,
An air flow is generated to levitate the magnetic head 6. At this time, it is still in the C8S rotation range. When the rotation is further increased, the pressure increases in the part far from the spindle 1, and on the contrary, the pressure decreases in the part of the spindle l and spindle hub 2 in the centripetal direction.
The air flow generated from the protrusions and the magnetic disk 5 is
The air passes through the DA, enters the gap between the spindle hub 2 where the pressure is low, passes through the filter 13, and is supplied with clean air to the magnetic disk 5 and magnetic head 6. At this time, the magnetic head 6 is in a sufficient area to fly relative to the magnetic disk 5.

However, in the operating area where magnetic recording and reproduction are performed, the spindle 1 rotates at a high speed of 3000 rpm or more, and therefore dust generated from the bearing portion of the spindle 1 and generated when the carriage 8 is constantly moving. Dust from the bearing part of carriage 8 and HD
Due to the combination of adverse conditions such as dust caused by the diffusion of airflow from residual materials such as screw drills generated during A manufacturing, and dust generated by contact in the rotation area of C8S, the filter 13 and plate The effect of the filter 12 is not fully exhibited. Furthermore, the tasses 1~ adhering to the magnetic disk 5 cannot be removed.

However, in the present invention, even if the above-mentioned adverse conditions overlap and dust increases and dust tries to enter the minute gap between the magnetic disk 5 and the magnetic head 6, the magnetic disk 5, which is most required for air purification, and a plurality of openings 14a on the surface of the magnetic head 6, spaced apart from the surface of the magnetic disk 5 by a minute gap.

14a... by the dust suction 11i14, the pipe 1
6 through the exhaust mechanism 15 to force the dust out and in advance
Therefore, no dust enters the minute gap between the magnetic disk 5 and the magnetic head 6, and a clean air flow is always supplied.

〔Effect of the invention〕

As explained above, according to the present invention, since the dust I that has adhered or is about to adhere to the surface of the magnetic disk is forcibly sucked in, the surface of the magnetic disk can be cleaned.

Furthermore, although the present invention also includes a conventional filter, the cleaning effect can be enhanced in combination with the effect of the conventional filter. It also extends the lifespan of conventional filters.
As an HDA, it can have a longer lifespan and further improve reliability.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is an enlarged view showing the dust suction R structure, Fig. 3 is a plan view showing the state with the magnetic disk removed, and Fig. 4 is a conventional example. FIG. 1...Spindle 2...Spindle hub 3
...Disk clamp 4...Spindle motor

Claims (1)

[Claims] (1) A sealed magnetic disk device in which a set of multiple magnetic disks stacked via disk spacers and held by a spindle hub and a magnetic head for recording and reproducing the magnetic disks is housed in a closed space. The dust suction mechanism is located in a space between adjacent magnetic disks and has a plurality of openings facing the surface of the magnetic disk, and an exhaust mechanism for forcibly exhausting dust from the openings of the dust suction mechanism. A magnetic disk device characterized by: