JPH03201286A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To improve head crush in a narrow spacing by electrifying and eliminating fine dust floating in a device by electrodes at the time of passing between disks. CONSTITUTION:A first electrode 8 which electrifies dust and a second electrode 9 which collects dust electrified by the first electrode 8 are provided to face the surface of a magnetic disk 3. When voltages are applied to first and second electrodes 8 and 9, dust electrified by the first electrode 8 is collected by the second electrode 9. The second electrode 9 is moved to the front of a filter 7 by a moving means just before a magnetic disk device is stopped, and voltage application is stopped and oscillation is applied by an exciting means, and thereby, collected dust is shaked down and is collected to the filter 7. Thus, dust is efficiently eliminated.

Description

[Detailed Description of the Invention] [Summary] Regarding a magnetic disk device used as an external storage device for computers, etc., the purpose of this invention is to improve the ability to remove dust from the magnetic disk device, and to improve the ability to remove dust from the magnetic disk device. a first electrode arranged to charge dust at a position; and a second electrode arranged near the first electrode and downstream of the airflow generated by the rotation of the magnetic disk to capture the charged dust. and moving means for moving the second electrode to the front of a filter provided outside the magnetic disk immediately before stopping the magnetic disk drive, and excitation means for vibrating the second electrode. Configure.

[Industrial application field]

The present invention relates to a magnetic disk device used as an external storage device for computers and the like.

[Conventional technology]

FIG. 3 shows an example of a conventional magnetic disk device.

This is a magnetic disk enclosure (sealed casing) 1 containing a magnetic disk 3 that is rotationally driven by a spindle 2, a magnetic head 4 for writing or reading information on the magnetic disk 3, and an arm for holding the magnetic head 4. 5, a head positioning mechanism 6 for selecting and positioning a track on a magnetic disk, a filter 7 for removing dust, and the like.

In such a magnetic disk device, the magnetic head 4
If dust enters between the magnetic head and the magnetic disk 3 while it is in a flying state, the slider surface of the magnetic head and the magnetic disk surface will be damaged, resulting in a head crash. For this reason, in conventional magnetic disk drives, in order to remove the dust generated within the device, a filter 7 is installed in the flow path of the airflow generated by the rotation of the disk, and the filter 7 removes the dust carried by the airflow. A method of capturing the information is being adopted.

[Problem to be solved by the invention]

However, in recent years, in order to realize high-density recording in magnetic disk devices, it has become essential to reduce the flying height of the magnetic head and to increase the spacing between the magnetic head and the magnetic disk.

For this reason, even small dust particles that could previously be ignored can cause head crashes in the narrow spacing that accompanies higher densities, so it is necessary to remove dust even more efficiently than conventional methods. The problem is that there is a lack of capacity.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide a magnetic disk drive with improved ability to remove dust from the magnetic disk drive.

[Means to solve the problem]

In order to achieve the above object distantly, the magnetic disk device of the present invention includes a first electrode 8 arranged to charge dust at a position facing the magnetic disk surface, and a A second electrode 9 is disposed on the downstream side of the airflow generated by the rotation of the magnetic disk 3 and captures charged dust, and the second electrode 9 is provided outside the magnetic disk 3 immediately before the magnetic disk device stops. The second electrode 9 is moved to the front surface of the filter 7, and the second electrode 9 is vibrated.

[For production]

By applying a voltage to the first electrode 8 and the second electrode 9, the dust charged by the first electrode 8 is captured by the second electrode 9. Immediately before the magnetic disk drive stops, this second electrode 9 is moved to the front of the filter 7 by a moving means, the voltage application is stopped, and the vibrating means 14 gives vibration to the second electrode 9 to remove the captured dust. This enables efficient dust removal.

〔Example〕

1 and 2 are diagrams showing an embodiment of the present invention, with FIG. 1 being a top view and FIG. 2 being a perspective view of the main parts.

This embodiment includes a magnetic disk 3 supported and rotationally driven by a spindle 2 in a disk enclosure 1, and a magnetic disk 4 for writing or reading information on the magnetic disk 3, as shown in FIGS. and a head positioning mechanism 6 that positions the magnetic head 4 via the arm 5;
The fact that a filter 7 is provided is the same as in the conventional example shown in FIG. A second electrode 9 for capturing dust and dirt is provided opposite to the surface of the magnetic disk. The first electrode 8 is supported and fixed by an arm 10. Further, the second electrode 9 is connected to the first electrode 8 by the airflow 1 generated by the rotation of the magnetic disk 3.
It is disposed on the downstream side of the filter 1 and rotatably supported via an arm 13 around a shaft 12, so that the position can be changed from the dust trapping position to the front of the filter 7. Furthermore, a vibrating means 14 such as a piezoelectric element capable of imparting vibration is attached to the second electrode 9. Although the first electrode 8 and the second electrode 9 are shown as two flat plates in the figure, they are not limited to two and may be one, and their structure is as follows: Aluminum plate or thin film, metal plate or thin film whose surface is coated with a resin film, surface roughened as above, O-wire or mesh metal wire, and solid alumite or resin. A coated metal wire or the like can be used.

The operation of this embodiment configured as described above will be explained with reference to FIG.

First, a potential of the same polarity (for example, positive) is applied to the first electrode 8 and the second electrode 9. As a result, the dust 15 carried by the airflow 11 generated by the rotation of the magnetic disk 3 becomes negatively charged when passing near the first electrode 8 having a positive potential. This negatively charged dust 15 then passes near the second electrode 9 which has a positive potential.
is attracted and captured.

The second electrode 9 that has captured the dust 15 rotates around the shaft 12 and moves to the front of the filter 7 just before the apparatus is stopped. The potential applied here is made zero, and the excitation means 14
is activated to vibrate the electrode 9 to shake off the adhering dust and trap it in the filter 7. When the device is operated again, this second electrode 9 returns to its original position.

Note that these series of operations are instructed by software.

〔Effect of the invention〕

As explained above, according to the present invention, small dust particles floating inside the device are removed by the electrodes when they pass between the magnetic disks, which improves head crashes in narrow spacings and enables high-density recording. becomes possible.

[Brief explanation of drawings]

FIG. 1 is a top view showing an embodiment of the present invention, FIG. 2 is a perspective view of essential parts of the embodiment of the present invention, and FIG. 3 is a diagram showing a conventional magnetic disk device. In the figure, 1 is a disk enclosure, 2 is a spindle, 3 is a magnetic disk, 4 is a magnetic head, 7 is a filter, 8 is a first electrode, 9 is a second electrode, 10.13 is an arm, 11 is an air flow, 12 is a shaft, 14 is an excitation means, and 15 is dust.

Claims (1)

[Claims] 1. A first electrode (8) arranged to charge dust at a position facing the magnetic disk surface;
8) and on the downstream side of the airflow generated by the rotation of the magnetic disk (3), the second electrode (9) captures electrically charged dust; Immediately before the magnetic disk (3) is stopped, the second electrode (9) is moved to the front surface of the filter (7), and the second electrode (9) is vibrated. What is claimed is: 1. A magnetic disk device comprising: