JPH03263680A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To remove dust positively through the use of a differential pressure between outside and inside of casing by providing a suction and a suction air filter to a position under a lowest negative pressure in the casing and providing a delivery port and a delivery air filter to a position under a highest positive pressure with respect to an external atmospheric pressure. CONSTITUTION:A suction port 11 is provided to a casing 1 at a position under a lowest negative pressure with respect to an external atmospheric pressure in the casing 1, a suction air filter 12 removing dust to the suction port 11 or in the vicinity thereof, and on the other hand, a delivery port 13 is provided to a position under a positive pressure with respect to an atmospheric pressure in the casing 1 and a delivery air filter 14 removing dust to the delivery port 13 or in the vicinity thereof. Thus, the dust in the air taken in the casing 1 from the suction port 11 by a differential pressure between the inside and the outside of the casing 1 is removed by the suction air filter 12, and when the air is delivered from the delivery port 13 externally by the differential pressure between the inside and the outside of the casing 1, the dust in the casing 1 is removed by the delivery port air filter 14. Thus, the dust removal efficiency of the air filter is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to a magnetic disk device with excellent dust removal performance.

[Conventional technology] FIG. 9 shows a magnetic disk device according to the prior art.

In the figure, reference numeral 1 denotes a casing, and the casing 1 has an internally sealed structure including a casing main body 2 formed into a substantially rectangular plane and a lid 3 that covers the upper side of the casing main body 2.

Reference numeral 4 denotes a magnetic disk supported via a disk clamp 5 on a rotating shaft (not shown) of a spindle motor provided in the casing body 2, and the magnetic disk 4 rotates at a high speed of 11,000 rpm or more within the casing. 6 is a magnetic head for writing and reading information on the magnetic disk 4; 7 is a magnetic head moving mechanism for reciprocating the magnetic head 6 in the radial direction of the magnetic disk 4; The magnetic head moving mechanism 7 includes, for example, a support shaft 7A provided upright on the casing body 2, a swing arm 7B rotatably supported by the support shaft 7A and having the magnetic head 5 mounted on its tip, and a swing arm 7B. A drive motor 7 such as a voice coil motor that reciprocates the arm 7B in the horizontal direction
It is composed of C.

Reference numeral 8 denotes an intake/exhaust port provided in the lid 3 of the casing 1 so as to face the disc clamp 5. A breathing filter 9 is provided on the inner surface of the lid 3 to close the intake/exhaust port 8. There is. Reference numeral 10 denotes a circulation filter located on the side of the magnetic disk 4 and provided inside the casing 1, which functions to remove dust from the air circulating inside the casing 1.

The magnetic disk device is configured as described above, and as the magnetic disk 4 rotates at high speed, an air flow is generated within the casing l, and suction is performed by utilizing the negative pressure above the rotation center of the magnetic disk 4. Outside air is sucked in and discharged through an exhaust port 8 and a breathing filter 9. Further, a circulation filter 10 is disposed in the middle of the air flow inside the casing 1 to remove dust inside the casing 1.

[Problems to be Solved by the Invention] By the way, as described above, the circulation filter 10 that removes dust inside the casing 1 is designed to remove dust from inside the casing 1 in the middle of the air flow flowing in a fixed direction inside the casing 1 as the magnetic disk 4 rotates. Moreover, the airflow was flowing at a relatively slow speed, and it was not possible to obtain a pressure difference sufficient to actively draw air into the circulation filter 10 side. .

Moreover, as magnetic disk drives tend to become smaller,
It is difficult to increase the dust removal efficiency by using a large circulation filter, and it is also difficult to secure enough space to obtain a large differential pressure before and after the circulation filter 1°.

For this reason, the conventional technology cannot solve the problem that the dust removal power of the circulation filter 10 is weak and the removal efficiency tends to decrease, and it is not possible to completely prevent the head crash of the magnetic head 5 due to dust. Ta.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a magnetic disk drive that can actively remove dust with a filter by utilizing the pressure difference between the inside and outside of a casing. It is.

[Means for Solving the Problems] The feature of the configuration adopted by the present invention in order to solve the above-mentioned problems is that the casing has a casing which is located at a part of the casing where the pressure is most negative with respect to the outside air pressure. A suction port is provided, and a suction side air filter for removing dust is provided at or near the suction port, and the casing has a discharge port located at a portion of the casing that has a positive pressure relative to the atmospheric pressure. A discharge side air filter for removing dust is provided at or near the discharge port.

[Effect]

With this configuration, dust is removed from the air sucked into the casing from the suction port by the air filter on the suction side due to the differential pressure between the inside and outside of the casing, and the dust inside the casing is removed due to the differential pressure between the inside and outside of the casing. When air is discharged to the outside from the discharge port, it is removed by the discharge side air filter.

[Example] Hereinafter, an example of the present invention will be described in detail based on FIGS. 1 to 8. Note that the same components as those of the prior art described above are given the same reference numerals, and their explanations will be omitted.

1 and 2 show a first embodiment, in which 11 is a suction port for sucking outside air into the casing 1, and the suction port 11 has the lowest pressure inside the casing 1,
The part where the pressure becomes negative than the external pressure, that is, the magnetic disk 4
It is formed on the lid body 3 above the center of rotation. 1
Reference numeral 2 denotes a breathing filter on the suction side attached to the inner surface of the lid body 3 so as to close the suction port 11. The breathing filter 12 removes dust in the external air sucked into the casing 1.

On the other hand, 13 is a discharge port for discharging the air inside the casing 1 to the outside. It is formed in the casing body 2 near the outer peripheral edge of the casing body 2. Reference numeral 14 denotes a breathing filter on the discharge side that is attached to the inner surface of the casing main body 2 so as to close the discharge port 13. The breathing filter 14 prevents the pressure near the discharge port 13 from flowing outside when the magnetic disk 4 stops rotating. Dust in the air entering the casing 1 is removed when there is almost no difference in pressure, or in the process of air being discharged from the casing 1, the dust in the casing 1 is removed.

This embodiment has the above-mentioned configuration, and its operation will be explained next. When the magnetic disk 4 rotates, a centrifugal force acts on the air on the outer circumferential side of the magnetic disk 4, causing the air to flow from the radial center to the outer circumferential side, so that the air intake port 11 side becomes a negative pressure than the outside air pressure, and the air is inhaled. External air is sucked into the casing l through the opening 11, and dust in the air is removed by means of a breathing filter 12.

On the other hand, the pressure on the outer peripheral side of the magnetic disk 4 increases and becomes higher than the outside air pressure, so the air inside the casing 1 is discharged to the outside from the discharge port 13 via the breathing filter 14.
At this time, dust inside the casing 1 is removed by the breathing filter 14.

In this way, this embodiment utilizes the air flow generated by the pressure difference between the inside and outside of the casing 1 to actively circulate air through the breathing filter 12, so that dust in the air can be efficiently removed. Can be removed.

Note that FIG. 3 shows a modification of this embodiment, in which the discharge port 13'
is formed on the side plate 3A of the lid body 3, and the breathing filter 1
4' is attached to the inner surface of the side wall 3A so as to close the discharge port 13', and by configuring it in this way, the same effects as in this embodiment can be obtained.

Next, FIGS. 4 to 6 show another embodiment of the present invention in which circulation filters 15, 16, and 17 are used in place of the breathing filter 14 on the discharge port 13 side, respectively.

First, FIG. 4 relates to a second embodiment, and shows a case where the circulation filter 15 is installed upward in accordance with the opening direction of the discharge port 13. In this case, the inlet 15A of the circulation filter 15 faces in a direction perpendicular to the air flow direction A. In this embodiment and other embodiments shown in FIGS. 5 and 6, 16 indicates a gasket.

FIG. 5 shows a third embodiment, and the feature of this embodiment is that the inlet 18A of the circulation filter 18 is perpendicular to the outlet 17 formed in the casing body 2 facing downward. The structure is such that the purified air is guided toward the discharge port 17 by the guide plate 18B. With this configuration, the inlet 18A of the circulation filter 18 can be directed in the air flow direction A, and air can be smoothly sucked into the circulation filter 18.

Next, FIG. 6 shows a fourth embodiment, and the feature of this embodiment is that a discharge port 19 is formed in the side plate 3A of the lid 3 of the casing, and the discharge port 19 is closed. Side plate 3A
The reason is that a circulation filter 20 is disposed on the inner surface of the filter. With this configuration, air can be smoothly sucked into the circulation filter 20 similarly to the third embodiment described above.

On the other hand, FIG. 7 shows a fifth embodiment of the present invention, and the feature of this embodiment is that a discharge port 21 is formed in the upper plate 3B of the lid 3 of the casing 1, and a A curved guide plate 22A similar to the circulation filter 18 shown in FIG.
The reason is that a circulation filter 22 having a diameter is disposed in communication with the discharge port 21.

Furthermore, FIG. 8 shows a sixth embodiment, and the features of this embodiment are that a discharge port 23 is formed in the side plate 3A of the lid 3 of the casing 1, and a fifth embodiment is provided in the casing 1. The circulation filter 22 with the guide plate 22A shown in the example is arranged horizontally in communication with the discharge port 23.

By configuring as in the fifth and sixth embodiments, air can be discharged more smoothly than in the case where the discharge port is formed downward in the casing body 2. Further, as shown in the second to sixth embodiments, by using a circulation filter in place of the breathing filter, parts can be shared and costs can be reduced.

In the first embodiment, the discharge port 13 is provided in the casing body 2 near the outer peripheral edge of the magnetic disk 4, but the discharge port 13 may be provided in any location where the pressure is high. , but is not limited to the examples.

[Effects of the Invention] The present invention has been described in detail above, and the casing is provided with a suction port and a suction side air filter located at a portion of the casing where the pressure is most negative relative to the atmospheric pressure, A discharge port and a discharge side air filter are located in the part of the casing where the pressure is positive compared to the outside air pressure, and the air sucked into the casing is routed through each air filter using the differential pressure between the inside and outside of the casing. Since the configuration is such that the dust removal efficiency of the air filter is improved compared to the conventional technology, a highly reliable magnetic disk device can be achieved.

In addition, as mentioned above (because air is circulated within each air filter using the differential pressure between the inside and outside of the casing,
As a result of eliminating the need to secure a space within the casing to obtain a differential pressure as in the prior art, the magnetic disk device can be made smaller.

[Brief explanation of drawings]

1 and 2 relate to a first embodiment of the present invention, in which FIG. 1 is a front view of a magnetic disk device with a part of the lid broken away, and FIG. 2 is a main part of the magnetic disk device. FIG. 3 is a longitudinal sectional view of a main part of a magnetic disk device according to a modification of the first embodiment, FIG. 4 is a longitudinal sectional view of a main part of a magnetic disk device according to a second embodiment, and FIG. The figure is a longitudinal cross-sectional view of a main part of a magnetic disk device according to a third embodiment, FIG. 6 is a longitudinal cross-sectional view of a main part of a magnetic disk drive according to a fourth embodiment, and FIG. External perspective view of main parts of such magnetic disk device, No. 8
The figure is a perspective view of the main part of a magnetic disk device according to a sixth embodiment, and FIG. 9 is a front view showing a magnetic disk device according to the prior art with a part of the lid broken away. 2... Casing body, 3... Lid body, 4... Magnetic disk, 6... Magnetic head, 11 Suction port, 12.1
414'...Respiration filter, 13.13', 1719
21 23...Discharge port, 15, 18, 20°22.
...Circulation filter. Figure 1

Claims (1)

[Claims] In a magnetic disk device, a casing body and a lid form a casing whose interior is sealed, and a magnetic disk on which information is recorded and reproduced via a magnetic head is rotatably provided in the casing. is provided with a suction port located in the part of the casing where the pressure is most negative relative to the outside air pressure, and a suction side air filter for removing dust is provided at or near the suction port; A magnetic disk device characterized in that a discharge port is provided within the casing at a portion where the pressure is positive with respect to the outside air pressure, and a discharge side air filter for removing dust is provided at or near the discharge port. .