JPH01194183A - Hard disk device - Google Patents

Abstract

PURPOSE:To attain a compact, simple structure and comparatively low cost device by constituting the filter of a film form material having a proper filtering area and a mesh. CONSTITUTION:In a sealing device for sealing and enclosing a magnetic record ing disk or the like, the filter of the film form having the proper filtering area and the mesh is disposed. The film consists of one plate filter member 17 and filter film 18 fixed on this peripheral edge. In such a way, the flow of air is executed and a respiratory port communicating with an external side is disposed in the vicinity of the filter and the pressure difference of the air in the sealing device is released by the respiratory port. Thereby, a filtering function is execut ed and the structure is compact and simple and inexpensive.

Description

[Detailed Description of the Invention] [Industrial Field of Application J] The present invention is directed to a device in which a film-like filter is installed in a sealing device that surrounds a magnetic recording disk or the like to prevent dust from entering. Regarding the hard disk storage provided.

[Conventional technology]

Hard disk drives generally have a very small flying height of 0.3 to 0.4 μm between the disk and the head. Therefore, in order to improve reliability such as preventing head 7 from lashing, a sealed structure is used to isolate the head from the outside. It is assembled in a clean room with less than 100 units. After assembly, dust inside (0.3μm
An internal filter is provided for the remainder of the above). Also,
A breathing filter is placed because of the breathing effect due to the pressure difference between the inside and outside. This filter door paper has a collection efficiency of 9997, or 504 for the internal filter. In particular, the internal filter was housed in a plastic filter frame.

Figure 111 shows the overall structure of the hard disk @ platform.
Is Figure 2 an example of the structure of a conventional internal filter? show.

First, the overall configuration of the hard disk device will be explained with reference to FIG. 11. A spindle motor 4 is attached to the base 3,
One or more magnetic recording disks 5 are attached to this via a disk spacer 6 with a disk clamp 7. A head 1 for reading and writing data is attached to a helad arm 2. This head arm 2 is attached to a base 3 via a shaft 8. −
On the other hand, this shaft 8 is equipped with a voice coil motor (VCM).
) is attached to the coil part 9. The magnet part 1Ω of the VCM is attached to the base 3 in such a manner that the coil part 9 is sandwiched therebetween. A head FPC 11 that transmits signals from the head 1 to a printed circuit board (not shown in the figure) is attached to the head arm 2, and -100 is connected to the printed circuit board. The internal filter 12 is located inside the base 3, and a cover (not shown in this figure) that covers all the internal components of the base,
It is sealed with a gasket. This cover has another filter, a breathing filter, for air to enter and exit from the outside. In addition, the hard disk device is composed of a frame, a printed circuit board, and the like.

Next, its functions will be explained.

The spindle motor rotates the magnetic recording disk 5 at a predetermined number of rotations. The head 1 is accurately positioned at a predetermined location on the disk by the head section 9 and magnet section 10 of the VCM and the carriage mechanism of the arm.

Then, the signal read by head 1 is sent to head FP.
Amplified by the circuit in C11 (or as is)
, the necessary information is transmitted to the printed circuit board and converted into VC.

Or, conversely, data from higher-level equipment? In some cases, the information is converted by a circuit board and recorded on a disc through an FPC and a head.

Since the disc and the magnetic head are floating at a very small height of 0.3 to 0.4 μm, if there is dust or the like larger than 0.6 μm, a collision between the disc and the head called head clarity will occur. If this happens, it becomes impossible to read the data, which becomes a serious problem. Prevent this head crash,
It has a sealed structure to improve reliability, is assembled in a class 100 or below clean room, and is equipped with an internal filter to remove dust inside. In addition, the pressure difference with the outside air that occurs when a sealed device is transported (air transportation #), or the internal pressure rise due to internal or external heat generation when the device goes from a stopped state to an operating state, etc. Difference V
Air flows in and out, and a breathing filter is created by actively providing an inlet or outlet for this purpose.

Figure 12 shows an example of a conventional internal filter.

Door paper 1 folded into outer plastic front frame 15
4 is sealed with adhesive 16. In this case, the actual effective door paper area is considerably smaller than the filter base.

Further, as one of the disclosed examples of the prior art, for example, JP-A No. 58.
-70470 publication is mentioned. In this publication, a disk compartment for storing magnetic disks and the like and a recirculation filter compartment for storing filters are divided into a clean box, and the air that has been subjected to centrifugal action from the magnetic disk in the disc compartment is recycled. Is this what you want to lead to the inlet of the circulation filter? Introduced air that is filtered and then discharged from the nuclear filter outlet? a spindle-side VC that is guided into a plenum, where air pressure is increased above ambient pressure to rotate the magnetic disk;
It is designed to circulate and supply air.

By maintaining the air pressure higher than the ambient pressure, it is possible to prevent outside air from entering the clean box and contaminating the inside.

[Problem to be solved by the invention]

In the conventional technology, a relatively large hard disk device of about 5.25 inches has plenty of internal space;
The filter frame and structure did not pose much of a problem.

However, when it comes to smaller 3.5-inch hard disk drives, there is no room for internal storage space, and the limited space available is limited to 5.5 inches.
There will be a problem if you put in a # filter like the 25 inch one. Also, since the price of the 6.5-inch device is lower, it is simpler and has sufficient performance. The things I have have become a source of peace of mind. Furthermore, as described above, the filter door material 14 of the internal filter 12 shown in FIG. Because it uses wood, mold costs and material costs are high, making the cost expensive. Based on the above, it has been thought that the line layer should be designed to create a filter that is small and relatively inexpensive.

- In the prior art disclosed in Japanese Patent Application Laid-open No. 58-70470, the recirculation filter itself has a structure similar to that shown in FIG. 12 and is expensive, and the recirculation filter is not housed. The structure of the compartment and the plenum that follows it is also complex, and does not satisfy the demands for miniaturization and low cost.

The present invention aims to solve the above problems, and provides a hard disk device that can be implemented in a small hard disk device, has a simple structure, has a sufficient filtering function, and can be formed at a relatively low cost. The purpose is to provide

[Means for Solving Section @] The problem is to provide a film-like filter having an appropriate filtration surface jet and mesh in a sealing device for temporarily assembling magnetic recording disks etc. in a sealed manner. Is it directly on the cover of the sealing device, the base that supports the magnetic recording disk, etc., or a film frame, etc.? This can be solved by attaching it indirectly using In addition, a breathing hole is provided on the cover etc. where the filter is attached.
This problem is solved by a filter structure in which the internal filter and the breathing filter are formed into an integral structure.

[Effect]

The present invention does not use a filter that is folded into a filter frame with a plastic back, as in the prior art, but instead installs a single film-like filter in a sealing device to prevent air flow through the filter. At the same time, a breathing port leading to the outside is provided near the filter, and the pressure difference in the air inside the sealed device is alleviated by the breathing port. As a result, the filter function can be achieved, and the structure can be made small and simple, and can be implemented at low cost.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

In FIGS. 1 to 6 and 8, the same reference numerals as those in FIG. 11 are the same or have the same function, and the explanation thereof will be omitted.

In FIG. 1, a magnetic recording disk 5 (the illustration consists of four disks)
etc. are hermetically sealed with a cover not shown in the figure. In principle, external air can enter and exit the sealed device only through the filter. The filter frame 19 shown in FIG. 1 is provided in the sealing device, is fixed to the lower surface 3, and is formed into a gate-shaped frame with vertical and horizontal members. In this embodiment, the filter frame 19 is integrally molded when the aluminum die-cast base 3 is molded.

The film also includes a flat filter member 17 and a filter film 18 fixed to the periphery of the filter member 17. The filter film 18 is made of polyester film, aluminum film, etc. used for name plates and the like. The filter is fixed to the filter frame 19 by peeling off the mount attached to the filter subassembly 17 and the filter film 18 and attaching the filter film 18 to the film frame 19.

Of course there is an adhesive on the filter film 18? The film assembly 17 may be fixed to the filter frame 19 by coating or applying an adhesive to the filter frame 19.0 As described above, this embodiment is a single flat filter without folds or the like. Since the subassembly 17 is directly attached, there is no need for a conventional plastic frame or the like, and a filter having a sufficient filtration area can be placed in the small base. Furthermore, as described above, the attachment and detachment of the filter is simply a pasting operation and is extremely simple.

FIG. 2 shows another second embodiment.

In this embodiment, the filter frame 19 is different from the gate-shaped filter frame shown in FIG. A filter film 18 surrounding a filter member 17 having the same shape as that in FIG. 1 is attached to a filter frame 19.

In the third embodiment shown in FIG. 3, a flat film door paper 17 is attached to a separate filter frame 20 with a mounting seat M, the L1 filter frame 20 is fixed to the base 3, and the L1 filter frame 20 is fixed to the base 3. It is designed to be stored.

The filter frame 20 is made of plastic material, aluminum material, or other structural material.

A fourth embodiment shown in FIG. 4 is similar to that of FIG. 2, but the filter subassembly 17a and the filter film 18a are formed from curved surfaces. By making it a curved body, the filtration area can be increased, and the filter rigidity can be increased.

In the fifth embodiment shown in FIG. 5, a film member 17b having a filter film 18bv is disposed over the outer periphery of the magnetic recording disk 5 and in the vicinity thereof. The filter furnace material 17b and the like are fixed to the base 6. FIG. 6 shows, as in FIG.
7b, etc., surrounding the magnetic recording disk 5 over the range from E to F. The reason why the range from E to F is set is that if the filter member 17b is within this range, contamination into the magnetic recording disk 5 will be effectively prevented, and it will not interfere with the arrangement or operation of the head 2, etc. This is, of course, not limited to this.

Although the filter member 17b shown in FIG. 5 is formed from a plane perpendicular to the surface of the magnetic recording disk 5, it may be a curved surface. Further, the total height of the filter member 17b is approximately equal to the total height of the magnetic recording disk 5,
Although this is desirable, it is of course not limited to this.

FIG. 7 shows a partial sectional view taken along the line 2--2 in FIG. 6, and the filter furnace material 17b and the like are fixed to the inner wall of the cover 21 of the sealing device. The cover 21 also has an opening on the side of the magnetic recording disk 5, and an air flow path 2 that opens into the sealing device.
4 is formed surrounding the magnetic recording disk 5. The filter furnace material 17b and the like are fixed so as to close the opening of the air flow path 24.

In the case of the embodiment shown in FIGS. 5 and 6, since the filter member 17b is disposed surrounding the magnetic recording disk 5, the air flow generated by the wind pressure due to the centrifugal force of the magnetic recording disk 5 is transmitted to the filter member 17b. As a result, the cleanliness inside the sealed device is improved. Note that the correction is obtained immediately after the rotation of the magnetic recording disk 5, and the coil portion 9-? of the whirlpool motor around the magnetic recording disk 5 is obtained. Dust from the drive unit such as the head FPC 11 is also difficult to enter between the magnetic recording disks 5, and the risk of head crash is greatly reduced.

Further, in the case of the embodiment shown in FIG. 6, as described above, there is an air flow path 24, and the air that has passed through the filter member 17b enters into the air flow path 24 due to the centrifugal force of the magnetic recording disk 5. It circulates within the closed device, and the inside of the - layer is cleaned.

In the above embodiments, the filter members 17.17a, 17
The collection efficiency of rubber such as b is 5 even with high performance materials of 99.984.
Even a low-performance material of about 0.05% is sufficient, and sufficient internal cleaning is performed.

Figures 8-10 show an embodiment of the invention with an internal filter and a breathing filter. The present invention is characterized in that an internal filter and a breathing filter are not provided separately, but one internal filter serves as a breathing filter.

As shown in FIG. 88 and FIG. 10, a flat film member 17 to which a filter film 18 is attached is attached to the cover 21 of the sealing device, such as a film frame 23 or the like. It is fixed using On the other hand, a breathing hole 22 is formed through a part of the cover 21.

The breathing port 22 is provided at a position facing a part of the filter member 17, and outside air communicates with the filter member 17 through the breathing port 22. The position of the filter member 17 where the breathing port 22 is present (section A in FIG. 8) functions as a breathing filter, and the portion of the filter member 17 that does not face the breathing port 22 (section B in FIG. 8) functions as an internal filter. do.

The breathing filter functions to alleviate pressure changes within the closure device due to rotation of the magnetic recording disk 5, etc., and to maintain a constant internal pressure drop. As described above, since one internal filter serves as a breathing filter, the filter door material 17 used in this embodiment needs to be a high-performance material with a collection efficiency of 99.58 cm.

As a result of the above, the number of parts and installation time are reduced.
It is also structurally simple and can be formed at low cost.

〔Effect of the invention〕

According to the present invention, the CI structure of the filter is simplified and the ease of installation is improved, so the price of the filter alone can be reduced, and the cost can be reduced by reducing the number of assembly steps.

In addition, since a space can be created in terms of space, the area of the inverted VCP material can be increased, increasing the internal cleaning ability, reducing head crashes, and improving reliability.

Also, the breathing filter and the internal filter? According to the invention that integrates two filters into one unit, the number of parts is reduced, and the number of installation steps is also reduced, which has the effect of reducing costs.

According to the invention in which the internal filter is surrounded around the disk, the dust generated by the disk always passes through the filter, and conversely, the dust generated in the carriage part etc. is difficult to enter between the disks. , internal cleanliness is increased, head crashes are reduced, and reliability is improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one embodiment of the invention, FIGS. 2 to 5 are perspective views of other embodiments of the invention, FIG. 6 is a plan view of another embodiment of the invention, and FIG. is a partial cross-sectional view of ■-Vll of Figure ηN6, and Figure 8 is an embodiment of the present related invention? 9 is a view taken in the direction of arrow C in FIG. 8, FIG. 10 is a perspective view showing the detailed structure around the attachment of the filter in the embodiment shown in FIG. 8, and FIG. 11 is a conventional hard disk drive. FIG. 12 is a perspective view showing the detailed structure of the internal filter. DESCRIPTION OF SYMBOLS 1...Head, 2...Hend art t1.3...Base, 4...Spindle motor, 5...Magnetic recording disk, 6...Disk spacer, 7...Disk clamp, 8...Shaft, 9...Coil part of voice coil motor (VCM), 10...Macnet part of voice coil motor (VCM), 11...Head FPC
112...interior 7 (le jl, 14.17.173,
17b... Filter furnace material, 15... Frame, 16
...adhesive, 18.18a, 18b...filter film, 19.20.23...filter frame, 21
...Hippo, 22...Breathing port, 24...Air flow path. Departure/1121 Evening/7 Fee/ri'/7oh )8 7
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Claims (1)

[Scope of Claims] 1. A magnetic recording disk, a drive device that supports and rotates the disk, a head disposed opposite to the disk, an arm to which the head is fixed at one end, and a drive device that supports and rotates the disk. a support mechanism that supports the arm; a drive device that drives the arm; a base that supports the devices and members as a whole; and a sealing device that is attached to the base and hermetically encloses the devices and the members as a whole. . A hard disk device having a filter provided in the sealing device, wherein the filter is constituted by a film-like member having an appropriate filtration area and a mesh. 2. Claim 1 in which the filter is a flat body
Hard disk device described in section. 3. Claim 1 in which the filter is made of a curved surface
Hard disk device described in section. 4. The hard disk device according to claim 1, wherein the filter is fixed to the sealing device via a filter frame. 5. The hard disk device according to claim 4, wherein the filter frame is integrally formed with the cover or the base of the sealing device. 6. The hard disk device according to claim 4, wherein the filter and the filter frame are fixed by interposing an adhesive between the filter film fixed to the periphery of the filter and the film frame. 7. The hard disk device according to claim 1, wherein the filter is arranged along the circumference of the magnetic recording disk. 8. The hard disk drive according to claim 7, wherein the filter disposed along the circumference of the magnetic recording disk has a flat or curved surface perpendicular to the surface of the disk. 9. A patent in which the filter disposed along the circumference of the magnetic recording disk has a height substantially equal to the vertical height of the disk and is disposed near the disk. A hard disk device according to claim 7. 10. The hard disk device according to claim 7, wherein the filter disposed along the circumference of the magnetic recording disk is disposed along substantially the entire outer circumference of the disk. 11. A cover of the sealing device to which a film disposed along substantially the entire outer periphery of the magnetic recording disk is fixed, the opening on the disk side is closed by the film, and the sealing device 11. The hard disk device according to claim 10, further comprising an air flow path having an opening communicating therein. 12. A magnetic recording disk, a drive device that supports and rotates the disk, a head that engages the disk, an arm that moves the head, a support mechanism that supports the arm, and a drive device that supports and rotates the disk. A driving device for driving, a base for supporting each of the devices and the members as a whole, a sealing device attached to the base and hermetically enclosing each of the devices and the members as a whole, and a filter provided in the sealing device. In the hard disk device, the filter is formed from a film-like member having an appropriate filtration area and mesh, and the filter is formed of an appropriately sized film that communicates the outside air side with the cover of the sealing device to which the film is fixed. A hard disk device characterized by having a breathing hole. 13. The hard disk device according to claim 12, wherein the filter is a flat body. 14. The hard disk device according to claim 12, wherein the filter is formed of a curved surface. 15. The hard disk device according to claim 12, wherein the filter is fixed to the sealing device via a filter frame. 16. Claim 15, wherein the filter frame is integrally formed with the cover or the base of the sealing device.
Hard disk device described in section. 17. The hard disk device according to claim 15, wherein the filter and the filter frame are fixed by interposing an adhesive between the filter film fixed to the periphery of the filter and the film frame. 18. The hard disk device according to claim 12, wherein the filter is arranged along the circumference of the magnetic recording disk. 19. The hard disk device according to claim 15, wherein the filter disposed along the circumference of the magnetic recording disk has a flat or curved surface perpendicular to the surface of the disk. 20. A patent in which the filter disposed along the circumference of the magnetic recording disk has a height substantially equal to the vertical height of the disk and is disposed near the disk. The hard disk equipment according to claim 15. 21. The hard disk device according to claim 15, wherein the filter disposed along the circumference of the magnetic recording disk is disposed along substantially the entire outer circumference of the disk.