JPH02113485A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To keep air in a closed vessel clean by interlocking an arm, which is close to a disk face and is turned in parallel with it, with an opening/closing plate of an air filter inflow port and forming a flow passage with a flow passage limiting plate similar to the arm. CONSTITUTION:When a magnetic disk 1 in the closed vessel is turned counterclockwise by power-on, an air current is generated, and a freely turnable arm 8 is turned clockwise with a shaft 12 as the center closely to the disk 1 and in parallel with the disk 1, and an opening and closing plate 7 closely brought into contact with the air inlet port of an air filter 5 with seal rubber 13a in-between is interlocked and turned until being brought into contact with a stopper rubber 10b of a flow passage limiting plate 6 similar to the arm 8. Then, an air flow passage is formed with a control plate 6 and the opening and closing plate 7 and dust in the closed vessel flows to the filter 5. Meanwhile, the air inlet port is closed by the opening and closing plate 7 simultaneously with power-off to prevent dust flowing to the filter 5 from flowing back to the closed vessel, and air in the closed vessel is kept clean to prevent the occurrence of damage due to dust, and the reliability of a magnetic disk device is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device having an air filter in a sealed container.

[Conventional technology]

Conventionally, in this type of magnetic disk device, as shown in FIG. 4, a magnetic head 2 mounted on a carriage 3 driven by a voice coil motor 4 moves over a magnetic disk 1 using an air flow caused by high-speed rotation of the magnetic disk 1. It levitates and records and plays information inside a sealed container. Therefore, if there is dust in the sealed container, the dust may enter the gap between the magnetic disk 1 and the floating magnetic head 2, causing damage to the magnetic disk 1 and the magnetic head 2, which can lead to a fatal crash of the magnetic disk device. It may also cause problems. In order to avoid this crush failure, an air filter 5 is provided in the sealed container, and the airflow generated by the rotation of the magnetic disk l is used to cause the airflow to flow through the air filter 5. Captures dust and maintains cleanliness inside the sealed container.

[Problem to be solved by the invention]

The conventional magnetic disk drive described above utilizes the airflow generated by the rotation of the magnetic disk, and the airflow passes through an air filter to trap dust in the sealed container. If there is not enough dust, it will not be able to capture enough dust, and the dust will circulate inside the sealed container.
The drawback is that it takes a long time to maintain the cleanliness inside the sealed container. In addition, when the magnetic disk drive is stopped, dust captured by the air filter leaks into the sealed container and scatters, damaging the magnetic disk and the magnetic field.
This has the disadvantage of reducing the reliability of the magnetic disk drive.

[Means to solve the problem]

The magnetic disk device of the present invention includes a spindle hub fixed to a rotating shaft driven by a motor in a sealed container, a magnetic disk mounted on the spindle hub, and a magnetic disk facing the disk surface of the magnetic disk. In a magnetic disk drive having an air filter for accommodating a mounted magnetic head positioning mechanism and purifying the air in the sealed container, an air filter is provided in front of an inlet of the air filter in close proximity to and parallel to the disk surface of the magnetic disk. a flow path restriction plate provided to face each other; an arm that rotates in parallel to the disk surface of the magnetic disk; an opening/closing plate that rotates in conjunction with the arm to open and close the inlet; a leaf spring fixed near the outside of the arm to press the arm and close the inlet with the opening/closing plate, and a contact surface between the flow path restriction plate and the opening/closing plate as well as a contact surface between the opening/closing plate and the flow It is characterized by having an elastic material on each contact surface with the inlet.

〔Example〕

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

FIG. 1 shows a partial plan view of a magnetic disk device of the present invention.

FIGS. 3(a), (b), and (c) show enlarged partial side views of a portion of FIG. 1.

In FIG. 1, the air filter 5 is fixed to a base 11 in a sealed container, and an opening/closing plate 7 rotatable around a shaft 12 fixed to the base 11 is provided in front of the inlet of the air filter 5. An arm 8 rotatable in the same direction as the plate 7 is connected.

FIG. 2 is a partial plan view showing the operating state of the magnetic disk device of the present invention. First, when the magnetic disk device is powered on, the magnetic disk l rotates counterclockwise at high speed, creating an air flow inside the sealed container. The arm 8 is provided with a rounded groove so as to be easily subjected to airflow resistance as shown in the BB cross-sectional view of FIG. 3(c) due to the airflow caused by the rotation. As a result, the opening/closing plate connected around the shaft 12 is rotated clockwise in parallel with the arm 8 and the leaf spring 9 fixed near the outside of the air filter 5 is pressed to automatically rotate the plate spring 9 in the clockwise direction. 7 is also rotated clockwise together with arm 8. That is, when the magnetic disk 1 rotates, at the same time, the inlet of the air filter 5, which had been closed by the opening/closing plate 7, opens, and the air flow inside the sealed container passes through the air filter 5. In addition, in order to reduce the circulation of dust in the sealed container and increase the flow rate to the air filter 5, the front part of the inlet of the air filter 5 is placed close to the disk surface of the magnetic disk l as shown in FIG. Flow path restriction plates 6 are provided which face each other in parallel. Similarly to the arm 8, the flow path restricting plate 6 is also provided with a rounded groove so as to be susceptible to air flow resistance, as shown in the AA cross-sectional view of FIG. 3(h). This flow path restricting plate 6 prevents dust from entering the gap between the magnetic disk 1 and the floating magnetic head 2, and also forcibly guides the air flow inside the sealed container to the inlet of the air filter 5. There is. Furthermore, a stopper rubber 10b is attached to the contact surface of the flow path restriction plate 6 with the opening/closing plate 7, and serves as a rotation stopper of the opening/closing plate 7 and also as a contact surface between the flow path restriction plate 6 and the opening/closing plate 7. Prevents airflow from leaking through the gap. Note that this stopper rubber lOb may be attached to the opening/closing plate 7.

Next, when the power to the magnetic disk device is turned off, the rotation of the magnetic disk l stops and the air flow generated in the sealed container disappears. The repulsive force of arm 9 pushes arm 8 back to the position shown in FIG. That is, shaft 1
The opening/closing plate 7 connected to the arm ♂ with the opening/closing plate 7 at the center returns to the position shown in FIG. The inlet is completely closed to prevent dust captured by the air filter 5 from scattering inside the sealed container. Note that this seal rubber]Oa may be attached to the inlet of the air filter 5.

〔Effect of the invention〕

As described above in detail, according to the magnetic disk drive of the present invention, when the magnetic disk drive is operated, the flow rate of air in the sealed container to the air filter can be increased, and dust can be trapped in the air filter. By improving the capacity, the dust inside the sealed container can be reduced in a short time, and when the magnetic disk drive is stopped, the opening/closing plate completely closes the inlet, which prevents the dust captured by the air filter from leaking into the sealed container. The air inside the sealed container can be kept clean without being scattered, which is effective in preventing damage to the magnetic disk and magnetic head and improving the reliability of the magnetic disk device.

[Brief explanation of drawings]

FIG. 1 is a partial plan view of the magnetic disk device of the present invention, and FIG.
The figure is a partial plan view showing the operating state of the magnetic disk device of the present invention, FIGS. 3(a), (b), and (c) are partial side views enlarging a part of FIG. 1, and FIG. 1 is a plan view of a conventional magnetic disk device. l...Magnetic disk, 2...Magnetic head, 3...
Carriage, 4...Voice coil motor, 5...Air filter, 6...Flow path restriction plate, 7...Opening/closing plate, 8
... Arm, 9... Leaf spring, IOa... Seal rubber, IOb... Stopper rubber, 11... Base, 1
2...Shaft.

Claims (1)

[Claims] A magnetic head positioning mechanism including a spindle hub fixed to a rotating shaft driven by a motor, a magnetic disk mounted on the spindle hub, and a magnetic head facing a disk surface of the magnetic disk is housed in a sealed container. In the magnetic disk device having an air filter for purifying the air in the sealed container, a flow path restriction plate is provided in front of the inlet of the air filter so as to be close to and parallel to the disk surface of the magnetic disk. , an arm that rotates close to and parallel to the disk surface of the magnetic disk;
an opening/closing plate that rotates in conjunction with the arm to open and close the inlet; and a leaf spring fixed near the outside of the inlet to press the arm and close the inlet with the opening/closing plate; A magnetic disk device characterized in that a contact surface between the flow path restricting plate and the opening/closing plate and a contacting surface between the opening/closing plate and the inflow port each include an elastic material.