KR20030086072A - Filtering apparatus for hard disk drive - Google Patents

Abstract

PURPOSE: A filtering device of a hard disk drive is provided to effectively prevent damage on a hard disk and a magnetic head by filtering fine particles easily separated from a hard disk surface. CONSTITUTION: A filter(70) filters fine particles from flowing air in a housing(10) generated by rotation of a hard disk(40) installed in the housing including a cover(20) and a base(30). A plurality of turbulent flow inducing members(91a,92a,93a,94a) are formed on a bottom surface(20a) of the cover and a top surface(30a) of the base to make flowing air turbulent flow by changing the flow of flowing air. An air guide(90) guides flowing air including the fine particles separated from a hard disk surface(40a) toward the filter.

Description

Filtering apparatus for hard disk drive

The present invention relates to a hard disk drive, and more particularly, to a filtering device of a hard disk drive for filtering fine particles in a housing in which the hard disk is embedded.

In general, a hard disk drive, which is an auxiliary memory device of a computer, is rotated about a hard disk rotating at a high speed by an internal spindle motor, a magnetic head for recording or playing back information recorded on a track of the hard disk, and a pivot axis. Actuator etc. which were installed as possible are provided.

The actuator records or reproduces data on the hard disk while the bobbin and coil installed at one end thereof are moved by the operation of the voice coil motor while the magnetic head installed at the other end moves to a desired track position. At this time, the magnetic head moving on both sides of the hard disk rises due to the airflow on the surface of the hard disk as the hard disk rotates at high speed and moves while maintaining a minute gap with the hard disk.

On the other hand, in recent years, hard disks have tended to decrease the width of tracks through which magnetic signals are input from the magnetic head in order to increase their storage capacity. In order to reduce the track width of the hard disk, it is necessary to reduce the gap between the hard disk surface and the magnetic head moving while floating from the hard disk surface in addition to improving the structure of the magnetic head receiving the magnetic signal. However, if the gap between the hard disk surface and the magnetic head is reduced in this manner, the magnetic head is more affected by fine particles such as dust present on the hard disk.

The reason why the fine particles exist in the hard disk drive is as follows.

While the internal space of the hard disk drive is packaged so that the internal space of the hard disk drive is cleaned, the particles to be located in the hard disk and the internal space are cleaned, but the fine particles on the hard disk surface and the components to be located in the internal space This may remain, and even if the process of packaging the hard disk drive in a clean room is difficult to completely block the fine particles, fine particles may be present in the sealed space of the hard disk drive. In addition, when the magnetic head is moved with respect to the hard disk, the magnetic head may hit the hard disk surface and fine particles may be generated. When the rotation of the hard disk is stopped, the magnetic head and the hard disk surface may collide with each other in the parking area. Fine particles may be generated.

As described above, the fine particles existing in the hard disk drive due to various causes stick to the hard disk surface and make the operation of the magnetic head unstable. That is, when the magnetic head strikes the fine particles existing on the hard disk surface, scratches may be generated on the magnetic head by the hard fine particles, thereby degrading the performance of the magnetic head. In addition, the accumulated fine particles may contaminate and damage the layers of the hard disk. In other words, the fine particles, such as the lubricating layer and the protective layer of the hard disk, are removed by the accumulated fine particles, and as a result, the performance of the magnetic recording layer may deteriorate, and a serious hard disk error may occur.

Therefore, it is necessary to remove the fine particles so that the physical particles in the hard disk drive, in particular, the magnetic head and the hard disk surface, or the fine particles that destabilize the operation of the magnetic head do not remain on the hard disk surface.

1 shows an example of a hard disk drive employing a conventional filtering device for removing fine particles remaining in the hard disk drive.

As shown, the hard disk drive includes an actuator 5 supporting a housing 1, a hard disk 4 installed in the housing 1, and a magnetic head 6 at the end thereof as recording and reproducing means. And a filtering device. The housing 1 includes a base 2 on which the hard disk 4 and the actuator 5 are rotatably installed and a cover 3 coupled to the upper portion of the base 2. The filtering device is for filtering out fine particles such as dust contained in the housing 1, and a filter 8 and a holder 8 provided in the housing 1 to support the filter 7. And an air guide 9 for guiding the flow air in the housing 1 toward the filter 7.

According to the conventional filtering device configured as described above, in the operation of recording or reproducing information on the hard disk 4, the hard disk 4 is rotated at high speed, and the air in the housing 1 is hardened. The disk 4 flows in the same direction as the rotational direction of the disk 4, that is, the arrow A direction. And, some of the air flowing in this way is guided by the air guide 9 to pass through the filter (7). In this process, fine particles such as dust contained in the flow air are filtered out by the filter 7, and only the remaining clean air passes through the filter.

On the other hand, since the hard disk surface 4a is a very smooth surface and considerable adsorptive force acts, the fine particles attached to the hard disk surface 4a are difficult to fall from the hard disk surface 4a, and the fine particles circulate with the flow air. Particles are easily attached to the hard disk surface 4a again.

However, since there are few obstacles in the housing 1 that can change the flow of the flow air except for the actuator 5 and the magnetic head 6, the flow of the flow air circulating in the housing 1 Becomes laminar flow. There is a problem that such laminar flow air cannot effectively separate the fine particles attached to the hard disk surface 4a with considerable adsorption force. As a result, the fine particles adhered to the hard disk surface 4a without being detached from the hard disk surface 4a physically damage the magnetic head 6 and the hard disk surface 4a or are unstable of the magnetic head 6 as described above. Will cause motion.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and easily removes fine particles attached to a hard disk surface, and provides a filtering device of a hard disk drive that can effectively filter such separated fine particles. There is this.

1 is a perspective view schematically showing a hard disk drive employing a conventional filtering device;

2 is an exploded perspective view showing a hard disk drive employing a filtering device according to a first embodiment of the present invention;

3A to 3C show a first modification of the turbulence induction member applied to the filtering device shown in FIG. 2;

4A and 4B show a second variation of the turbulence guide member applied to the filtering device shown in FIG. 2;

5A and 5B show a third modification of the turbulence induction member applied to the filtering device shown in FIG. 2;

FIG. 6 is a cross-sectional view of the filtering device illustrated in FIG. 2 cut in the advancing direction of a disk; FIG.

7 is an exploded perspective view illustrating a hard disk drive employing a filtering device according to a second embodiment of the present invention;

8A and 8B are partial cross-sectional views respectively showing compression pumps applied to the filtering device shown in FIG. 7;

FIG. 9A illustrates an air pipe applied to the filtering device illustrated in FIG. 7;

FIG. 9B is a diagram showing a cross-sectional view of the air pipe shown in FIG. 9A in the advancing direction of the disk and the pressure distribution of the flow air.

<Description of Symbols for Major Parts of Drawings>

10.Housing 20 ... Cover

30 Base 40 Hard Disk

50 ... actuator 60 ... magnetic head

70 ... filter 80 ... holder

91,92,93,94 ... Turbulence induction member 95,96 ... Turbulence guide member

94 ... compression pump 99 ... air pipe

The present invention for achieving the above object is a filter for filtering fine particles from the air flow in the housing including a cover and the base; Particle separation means for separating the fine particles attached to the hard disk surface from the hard disk surface using a flow of air; And an air guide for guiding the flow air including the fine particles separated from the hard disk surface toward the filter.

In addition, the particle separation means is installed to protrude toward the hard disk surface on at least one surface of the bottom surface and the upper surface of the base, at least one to change the flow of air flowing to induce the air flow turbulent flow It is preferable that it is a turbulent induction member.

Further, the particle separation means is formed with a compression pump for sucking and compressing the flow air in the housing, and a plurality of through-holes installed in connection with the compression pump and supplying the air compressed by the compression pump to the hard disk surface It is preferable to include an air pipe and at least one turbulence guide member installed on at least one surface of the upper surface of the base to protrude toward the hard disk surface and to change the flow of flowing air to induce the air flow to become turbulent. .

Hereinafter, a first embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

2 is an exploded perspective view showing a hard disk drive employing a filtering device according to a first embodiment of the present invention. For convenience of explanation, the storage space of the hard disk 40 is formed in the cover 20 and the air guide 90 and the filter 70 are installed only on the bottom surface 20a of the cover 20. However, the storage space of the hard disk may be formed in the base 30, the air guide 90 and the filter 70 is installed only on the upper surface (30a) of the base 30 or the bottom surface (20a) of the cover 20 And an upper surface 30a of the base 30, respectively. In addition, although one hard disk 40 is illustrated in the housing 10, two or more hard disks may be accommodated in the housing 10.

Referring to the drawings, the filtering device of the hard disk drive according to the first embodiment of the present invention is generated by the rotation of the hard disk 40 installed in the housing 10 including the cover 20 and the base 30 And a filter 70 for filtering out fine particles from the flow air in the housing 10. In addition, the filtering device of the hard disk drive is to induce the flow of air to be turbulent (turbulent flow) by changing the flow of the flow air circulating in the housing 10, protruding toward the hard disk 40 Finely separated from the turbulence induction members 91a, 92a, 93a, 94a and the hard disk surface 40a respectively installed on the bottom surface 20a of the cover 20 and the top surface 30a of the base 30 so as to be possible. It is provided with an air guide (90) for guiding the flow air containing particles toward the filter (70). In addition, the turbulence guide members 91a and 93a installed on the bottom surface 20a of the cover 20 and the turbulence guide members 92a and 94a installed on the upper surface 30a of the base 30 face each other. Are installed on each. However, the turbulence guide members may be installed only on one surface of the bottom surface 20a of the cover 20 and the top surface 30a of the base 30. In addition, the number of turbulence guide members respectively installed on the bottom surface 20a of the cover 20 and the top surface 30a of the base 30 is not limited to the illustrated embodiment. Here, the turbulent flow air induced by the turbulence induction members 91a and 92a may be turbulent guide members installed on the bottom surface 20a of the cover 20 and the top surface 30a of the base 30, respectively. 95, 96 is directed toward the filter 70, and the turbulent flow air induced by the turbulence induction members 93a and 94a is directed to the filter 70 by the air guide 90. The turbulence guide members 95 and 96 have a shape in which one end is bent toward the filter 70 so as to easily guide the induced turbulent flow air toward the filter 70. Meanwhile, reference numeral 50 denotes an actuator, reference numeral 60 denotes a magnetic head, and reference numeral 80 denotes a holder for supporting the filter 70.

FIG. 3A is a perspective view showing a first variation of the turbulence inducing members shown in FIG. 2, FIG. 3B is a partial sectional view taken along the line I-I of FIG. 3A, and FIG. 3C is a turbulent flow of flow air passing through the turbulence inducing members. A diagram illustrating the induction process and the pressure distribution of the flow air. Here, since the same reference numerals as those of FIG. 2 are substantially the same members, repetitive description thereof will be omitted.

Referring to FIG. 3A, the turbulence guide members 91b, 92b, 93b, and 94b may protrude in the direction of the hard disk 40, and the bottom surface 20a of the cover 20 and the top surface 30a of the base 30. A plurality of protrusions 911b, 921b, 931b, and 941b each having a dome shape provided at the top surface is arranged in the radial direction of the hard disk 40. The turbulence guide members 91b, 92b, 93b, and 94b, as shown in FIG. 3B, are adjacent to the protrusions 911b, 921b, 931b, and 941b, and the curved portions 912b, 922b, 932b, and 942b are connected to each other. Since the air flows through the turbulent induction members 91b, 92b, 93b and 94b, not only ensures sufficient contact area with the turbulent induction members 91b, 92b, 93b and 94b, but also the curved portion ( It is possible to easily pass through the space formed by the 912b, 922b, 932b, 942b. Therefore, the turbulence inducing members 91b, 92b, 93b, and 94b can easily induce turbulence without significantly disturbing the flow of the flowing air. In addition, as shown in Figure 3c, the air flowing through the turbulence induction member (91b, 92b, 93b, 94b) portion of the passage cross-sectional area is narrowed and greatly compressed, the passage cross-sectional area is rapidly enlarged to generate negative pressure It becomes turbulent flow in which the air flow direction changes irregularly.

Next, FIG. 4A is a perspective view illustrating a second variation of the turbulence inducing members, and FIG. 4B is a diagram illustrating a turbulent induction process of the flow air passing through the turbulence inducing members and a pressure distribution of the flow air. Here, too, the same reference numerals as those in FIG. 2 are substantially the same members, and thus repetitive description thereof will be omitted.

Referring to FIG. 4A, the turbulence induction members 91c, 92c, 93c, and 94c may have inclined portions 911c, 921c, 931c, and 941c having an uphill slope in a flow direction of air circulating in the housing 10. Has In the turbulent induction members 91c, 92c, 93c, and 94c, the cross-sectional area of the flow air passing through the inclined portions 911c, 921c, 931c, and 941c decreases gradually, thereby preventing the flow obstruction due to the rapid reduction of the cross-sectional area of the flow passage. It can reduce and easily induce turbulence. In addition, as shown in Figure 4b, while the passage cross-sectional area of the flow air passing through the turbulence induction members (91c, 92c, 93c, 94c) gradually narrowed, the flow air is gradually compressed and then the passage cross-sectional area rapidly enlarges the negative pressure This occurs and becomes turbulent flow in which the flow direction of air is changed irregularly. Here, the inclination of the inclined portion (911c, 921c, 931c, 941c) is preferably 10 degrees to 45 degrees.

Next, FIG. 5A is a perspective view showing a third modification of the turbulence inducing members, and FIG. 5B is a diagram showing the turbulent induction process of the flow air passing through the turbulence inducing members and the pressure distribution of the flow air. Here, too, the same reference numerals as those in FIG. 2 are substantially the same members, and thus repetitive description thereof will be omitted.

Referring to FIG. 5A, the turbulence guide members 91d, 92d, 93d, and 94d may move the plurality of step portions 911d, 921d, 931d, and 941d in the flow direction of air circulating in the housing 10. Have In the turbulent induction members 91d, 92d, 93d and 94d, the cross-sectional area of the flow air passing through the step portions 911d, 921d, 931d and 941d gradually decreases, thereby preventing flow disturbance due to the rapid reduction of the cross-sectional area of the flow passage. It can reduce and easily induce turbulence. In addition, as shown in Figure 5b, while the passage cross-sectional area of the flow air passing through the turbulence induction members (91d, 92d, 93d, 94d) is gradually narrowed, the flow air is gradually compressed and then the passage cross-sectional area rapidly enlarges the negative pressure This occurs and becomes turbulent flow in which the flow direction of air is changed irregularly.

Hereinafter, the operation of the filtering device according to the first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, referring to FIG. 2, in the operation of recording information on the hard disk 40 or reproducing the recorded information, the hard disk 40 is rotated at a high speed, and the air in the housing 10 is the hard disk. It flows in the same direction as the rotation direction of 40, ie, the arrow A direction.

FIG. 6 is a cross-sectional view of the filtering device illustrated in FIG. 2 cut in the advancing direction of the disc. As shown, the air flowing by the rotation of the hard disk 40 is turbulent induction members 91a, 92a, 93a provided on the bottom surface 20a of the cover 20 and the top surface 30a of the base 30, respectively. , And flows between the portion 94a and the hard disk 40. At this time, since the passage cross-sectional area of the flow air passing through the turbulent induction member (91a, 92a, 93a, 94a) becomes narrow, after the flow air is compressed and a large pressure is generated, the passage cross-sectional area is rapidly enlarged and the negative pressure is generated to form a vortex It becomes a turbulent flow in which the air flow direction changes irregularly. Then, the fine particles adhering to the hard disk surface 40a are easily separated from the hard disk surface 40a by turbulent flow air having an irregular motion. In addition, the flow air having a turbulent flow will supply enough energy for the fine particles contained in the flow air to flow together.

Referring to FIG. 2 again, the fine particles included in the flow air by the above-described process and flowed together are formed by the turbulent guide members 95 and 96 having one end bent toward the filter 70. Guided toward 90). In this process, the fine particles contained in the flow air is filtered by the filter 70, and only the remaining clean air passes through the filter.

Hereinafter, a filtering device according to a second embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, too, the same reference numerals as those in FIG. 2 are substantially the same members, and thus repetitive description thereof will be omitted.

7 is an exploded perspective view showing a hard disk drive employing a filtering device according to a second embodiment of the present invention.

Referring to the drawings, the filtering device of the hard disk drive according to the second embodiment of the present invention is generated by the rotation of the hard disk 40 installed in the housing 10 including the cover 20 and the base 30 And a filter 70 for filtering out fine particles from the flowing air in the housing 10. In addition, by changing the flow of the flow air circulating in the housing 10, inducing the flow of air to become turbulent flow to the upper surface 30a of the base 30 so as to protrude in the direction of the hard disk 40 At least one turbulence guide member (92a, 94a) provided. In addition, the compression pump 94 for sucking and compressing the flow air in the housing 10, and the air installed in connection with the compression pump 94 and compressed by the compression pump 94 to the hard disk surface ( The air pipe 99 in which the some through-hole 99a supplied to 40a is provided is provided. Here, the turbulence guide members installed on the upper surface 30a of the base 30 may apply various modification examples illustrated in the first embodiment.

8A is a cross-sectional view taken along line II-II of FIG. 7, and FIG. 8B is a cross-sectional view taken along line III-III of FIG. 8A. As illustrated, the compression pump 94 includes a plurality of impellers 98 for sucking and compressing the flow air and supplying the compressed air to the air pipe 99 and the impeller 98. A compression pump housing 96 and a clamper 43 which is formed integrally with the drive shaft 95a of the impeller 98 and fixes the hard disk 40 (FIG. 7) to the drive shaft 44 (FIG. 7). 7) is provided with a clamper plate (95).

FIG. 9A illustrates an air pipe applied to the filtering device of FIG. 7. As shown, the air pipe 99a passes through the compressed air farther from the compression pump 94 to compensate for the loss of the internal pressure caused by the compressed air flowing out through the plurality of through holes 99a. It is preferable that the taper shape is tapered so that the cross-sectional area of the inside is reduced. Then, the air compressed through the through-hole 99a of the air pipe 99 provided in the radial direction of the first hard disk 41 flows directly into the first hard disk surface 41a, whereby the first hard disk surface. The fine particles attached to the 41a can be easily separated.

FIG. 9B is a diagram showing a cross-sectional view of the air pipe shown in FIG. 9A in the advancing direction of the disk and the pressure distribution of the flow air. As shown, by the high-pressure outflow air flowing out through the through hole 99a of the air pipe 99, the flow of air becomes turbulent flow whose direction is changed irregularly.

The filtering device according to the second embodiment of the present invention induces turbulence by using a compression pump 94 and an air pipe 99 installed in connection with the compression pump 94. Although different from the above, the action of detaching particles from the hard disk surface 40a by the induced turbulent flow air is the same as that described in the first embodiment of the present invention, and thus repeated description thereof will be omitted.

As described above, the filtering device of a hard disk drive according to the present invention easily removes fine particles attached to a hard disk surface by turbulent flow air having an irregular flow from the hard disk surface. By filtering fine particles, damage to the hard disk and the magnetic head can be effectively prevented.

It is to be understood that the invention is not limited to that described above and illustrated in the drawings, and that more modifications and variations are possible within the scope of the following claims.

Claims (15)

A filter for filtering fine particles from the flow air in the housing including the cover and the base; Particle separation means for separating the fine particles attached to the hard disk surface from the hard disk surface using a flow of air; And an air guide guiding the flow air including the fine particles separated from the hard disk surface toward the filter. The method of claim 1, The particle separation means is installed to protrude toward the hard disk surface on at least one surface of the bottom of the cover and the top of the base, at least one turbulence induction to change the flow of air flow to induce air flow turbulent The hard disk drive filtering device, characterized in that the absence. The method of claim 2, And the at least one turbulence guide member is installed at positions opposite to each other on a bottom surface of the cover and an upper surface of the base. The method of claim 2, The particle separating means further comprises a turbulent guide member for inducing the flow of turbulent flow induced by the turbulence inducing member toward the air guide filtering device of a hard disk drive. The method of claim 4, wherein And the turbulence guide member has a shape in which one end thereof is bent toward the filter. The method of claim 2, The turbulence guide member is a filtering device of a hard disk drive, characterized in that a plurality of protrusions having a dome shape are arranged in a row in the radial direction of the hard disk. The method of claim 2, And the turbulence guide member has a slope having an uphill slope in a flow direction of air circulating in the housing. The method of claim 2, And the turbulence guide member has a plurality of step portions in a flow direction of air circulating in the housing. The method of claim 1, The particle separation means is an air pipe having a compression pump for sucking and compressing the flow air in the housing, and a plurality of through-holes installed in connection with the compression pump and supplying air compressed by the compression pump to the hard disk surface. And at least one turbulence inducing member installed on at least one surface of the upper surface of the base to protrude toward the hard disk surface and inducing a change in the flow of the flowing air so that the air flow becomes turbulent. Filtering device for disk drives. The method of claim 9, The compression pump is hard disk drive filtering device, characterized in that installed on the coaxial with the drive shaft for rotating the hard disk. The method of claim 9, The air pipe is filtering device of a hard disk drive, characterized in that the tapered shape so that the cross section of the inside away from the compression pump. The method of claim 9, The particle separating means further comprises a turbulent guide member for inducing the flow of turbulent flow induced by the turbulence inducing member toward the air guide filtering device of a hard disk drive. The method of claim 9, The turbulence guide member is a filtering device of a hard disk drive, characterized in that a plurality of protrusions having a dome shape are arranged in a row in the radial direction of the hard disk. The method of claim 9, And the turbulence guide member has a slope having an uphill slope in a flow direction of air circulating in the housing. The method of claim 9, And the turbulence guide member has a plurality of step portions in a flow direction of air circulating in the housing.