Disk device and its cover

Abstract

To provide a disc device capable of suppressing influence of external noise.SOLUTION: A disc device 1 includes: a base 17 of a housing 3 which stores a disc 9 of the disc device 1; a first cover 19 which is fitted on the base 17 and closes a first space part 23 storing the disc 9 in the housing 3; a second cover 21 which is fitted on the base 17 outside of the first cover 19; and a gasket 25 which is interposed between one or both of the first cover 19 and the second cover 21 and the base 17. The one or both of the first cover 19 and the second cover 21 are resin parts which are at least partially composed of resin in a plan view.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a disk drive such as a magnetic disk drive and a cover thereof. [Background technology]

[0002] Hard disk drives, which are disk devices built into personal computers, servers, etc., use a head to read and write information from a rotating recording medium called a disk. These hard disk drives are used in high-noise environments, and external noise can cause the metal housing to resonate, potentially adversely affecting the operation of the internal head.

[0003] Countermeasures against such noise include, for example, those disclosed in Patent Document 1, in which a weight is provided on the cover of the housing to change the natural frequency of the housing and suppress resonance.

[0004] However, this technology requires changing the natural frequency of the housing in response to external noise, which is a time-consuming process. This problem is not limited to hard disk drives, but is widespread in disk drives. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-258285 Summary of the Invention [Problem to be solved by the invention]

[0006] The problem to be solved is the time and effort required to suppress the effects of external noise. [Means for solving the problem]

[0007] The present invention relates to a disk drive, a housing base for accommodating a recording medium, and a housing attached to the base for accommodating the recording medium. sky a first cover for closing the gap; outside side In front a second cover attached to the base; and a sealing gasket interposed between the base and one or both of the first cover and the second cover, wherein the first cover and one or both of the second cover are one The part is a resin part made of resin. the law of nature , The portion other than the resin portion is a metal portion made of metal, and the gasket is interposed between the metal portion of one or both of the first cover and the second cover, which have the resin portion and the metal portion, and the base. A disk device is provided.

[0008] The present invention also provides a housing for accommodating a recording medium in a disk device. It can be attached to the base of the with or without a sealing gasket. A cover, in plan view The device includes a frame made of metal and a body made of resin held within the frame, The outer periphery of the base abuts against the base with or without the gasket interposed therebetween. Frame Provide a cover. [Effects of the Invention]

[0009] According to the present invention, the resin portion of the cover can attenuate external vibrations, so that the influence of external noise can be easily suppressed. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view showing a schematic configuration of a disk device (first embodiment). [Figure 2] FIG. 2 is a bottom view showing the first cover of the disk device of FIG. 1 (Embodiment 1). [Figure 3] FIG. 3 is a bottom view showing the second cover of the disk device of FIG. 1 (Embodiment 1). [Figure 4] 4A and 4B show a modified example of the first cover, and are a plan view and a cross-sectional view taken along line IV-IV, respectively (Example 1). [Figure 5]5(A) and 5(B) show another modified example of the first cover, and are a bottom view and a cross-sectional view taken along line VV, respectively (Example 1). [Figure 6] 6(A) and 6(B) show still another modified example of the first cover, and are a bottom view and a cross-sectional view taken along line VI-VI, respectively (Example 1). [Figure 7] FIG. 7 is a cross-sectional view showing a schematic configuration of a housing of a disk device (Embodiment 2). [Figure 8] FIG. 8 is a cross-sectional view showing a schematic configuration of a housing of a disk device (third embodiment). [Figure 9] FIG. 9 is a cross-sectional view showing a schematic configuration of a housing of a disk device (Embodiment 4). DETAILED DESCRIPTION OF THE INVENTION

[0011] The object of easily suppressing the influence of external noise is achieved by making at least a part of the cover of the housing that accommodates the recording medium a resin part made of resin.

[0012] A disk device (1) using such a cover includes a base (17), a first cover (19), a second cover (21), and a gasket (25). The base (17) houses a recording medium (9). The first cover (19) is attached to the base (17) and closes a space (23) in the housing (3) that houses the recording medium (9). The second cover (21) is attached to the base (17) outside the first cover (19). The gasket (25) is interposed between the base (17) and one or both of the first cover (19) and the second cover (21). At least a portion of the first cover (19) and / or the second cover (21) is a resin portion made of resin when viewed from above.

[0013] The resin portion may be configured to extend over the entire area in the thickness direction of one or both of the first cover (19) and the second cover (21).

[0014] At least a portion of each of the first cover (19) and the second cover (21) may be made of resin in a plan view.

[0015] The first cover (19) may be entirely made of resin in plan view.

[0016] The second cover (21) may have a frame portion (29) made of metal and a main body portion (31) which is a resin portion held within the frame portion (29), and the frame portion (29) may be welded to the base (17).

[0017] A second space (27) may be defined between the first cover (19) and the second cover (21), and the main body (31) of the second cover (21) may be provided within a range facing the second space (27).

[0018] Both the first cover (19) and the second cover (21) may include a frame portion (29, 39) made of metal and a main body portion (31, 41) that is a resin portion held within the frame portion (29, 39). In this case, a gasket (25) may be provided between the frame portion (29) of the first cover (19) and the base (17), and the frame portion (39) of the second cover (21) may be welded to the base (17).

[0019] The disk device (1) may be provided with a coating (33) that covers the resin parts (19, 31, 37, 41, 43).

[0020] The resin of the resin portions (19, 31, 37, 41, 43) may be carbon fiber reinforced plastic. [Example]

[0021] [Disk device structure] FIG. 1 is a cross-sectional view showing a schematic configuration of a disk device.

[0022] The disk device 1 of this embodiment is a hard disk drive serving as a magnetic disk device, and houses a disk assembly 5 together with a head gimbal assembly 7 and the like in a housing 3 .

[0023] The disk device 1 is not limited to a magnetic disk device, but may be an optical disk device or other disk device.

[0024] The disk assembly 5 is configured such that a plurality of disks 9, which are recording media, are stacked and supported rotatably by a spindle motor 6. The disks 9 are stacked in the thickness direction of the disk device 1 (hereinafter simply referred to as the "thickness direction").

[0025] In the head gimbal assembly 7, multiple head suspensions 11 are supported by a carriage 13 in a stacked state in the thickness direction, and are rotatable around the rotation axis of the carriage 13. A head unit 15 is supported at the tip of each head suspension 11. Each head unit 15 faces the disk 9 as it rotates, and reads and writes information.

[0026] The housing 3 is composed of a base 17 , a first cover 19 , a second cover 21 , and a gasket 25 .

[0027] The base 17 is configured in a box shape with one side open in the thickness direction. In this embodiment, the base 17 has a substantially rectangular shape in a plan view, but any suitable shape can be adopted. Note that the plan view refers to the state as seen from the thickness direction, and does not distinguish between the top and bottom surfaces. Therefore, the plan view refers to both the top and bottom surfaces.

[0028] The base 17 can be made of a metal such as aluminum, an aluminum alloy, a magnesium alloy, titanium, a titanium alloy, etc. A first cover 19 and a second cover 21 are attached to the base 17, and the housing 3 is sealed.

[0029] Fig. 2 is a bottom view showing the first cover 19. Note that in Fig. 2, the gasket 25 is hatched for clarity, as are Figs. 5 and 6.

[0030] 1 and 2, the first cover 19 closes a first space 23, which is a space in the housing 3 that accommodates the disc 9 and the like. This closure is achieved by a gasket 25 provided between the base 17 and the first cover 19. A gas with less resistance than air, such as helium, may be enclosed in the first space 23. In this case, it is preferable that the gasket 25 has low gas permeability and moisture permeability.

[0031] This first cover 19 is configured with a resin portion at least partially made of resin in plan view. In this embodiment, the entire first cover 19 is configured with a resin portion. This improves the workability and freedom of shape of the first cover 19, and also reduces its weight. Here, "entire area" refers to the entire area of ​​the base material of the first cover 19 in plan view and the entire area in the plate thickness direction. Therefore, the "entire area" does not include plating 26, oxide film, other coatings, etc., described below, of the first cover 19. In this embodiment, the plate thickness direction of the first cover 19 coincides with the thickness direction.

[0032] The resin that makes up the resin portion is carbon fiber reinforced plastic, which has excellent vibration damping properties. However, the resin may be any resin that has vibration damping properties, such as various fiber reinforced resins or polycarbonate. The damping properties here should be at least higher than those of the metal that makes up base 17.

[0033] The first cover 19 in this embodiment has a rectangular plate shape corresponding to the base 17, but may have any appropriate shape that can close the first space 23 of the housing 3. The first cover 19 is entirely covered with plating 26 as a coating.

[0034] The plating 26 prevents contamination such as adhesion of foreign matter and generation of dust from the first cover 19. The plating 26 may be any appropriate plating that can prevent contamination, such as nickel plating. The plating 26 may also be omitted.

[0035] An outer periphery 19a of the first cover 19 abuts against a step 17a of the base 17 in the thickness direction. The step 17a of the base 17 protrudes inward from the base 17 in a plan view and forms a side wall of the first space 23. A gasket 25 is interposed between the step 17a and the outer periphery 19a of the first cover 19. Therefore, the first cover 19 is attached to the base 17 with the sealing gasket 25 interposed.

[0036] The gasket 25 may be any gasket that can be interposed between the base 17 and the first cover 19 to seal the housing 3, and any suitable gasket such as a liquid gasket or a molded gasket may be used. In the case of a liquid gasket, it is applied to the first cover 19 in advance and allowed to harden. In the case of a molded gasket, it may be attached to the first cover 19 or the base 17 in advance, or it may be simply placed between the first cover 19 and the base 17 without being attached during assembly.

[0037] The first cover 19 is fixed by having its outer periphery 19a engaged with an engagement groove 17b of the base 17. The engagement groove 17b is formed in a circumferential shape and engages with the outer periphery 19a of the first cover 19 over the entire circumference. The engagement of the outer periphery 19a of the first cover 19 with the engagement groove 17b may be performed by press-fitting or the like.

[0038] Instead of the engagement grooves 17b, the first cover 19 may be fixed by engagement claws or the like provided on the base 17. Alternatively, the first cover 19 may be fixed to the base 17 by any suitable fixing means, such as a fastener such as a bolt or an adhesive.

[0039] FIG. 3 is a bottom view showing the second cover 21. As shown in FIG.

[0040] 1 and 3, the second cover 21 is disposed on the outer side in the thickness direction of the first cover 19. The second cover 21 of this embodiment closes a second space 27, which is a second space defined between the second cover 21 and the first cover 19. The second space 27 functions as an expansion chamber that attenuates external vibrations by expansion.

[0041] At least a portion of the second cover 21 is made of resin when viewed from above. In this embodiment, the second cover 21 is made of a frame 29 and a main body 31, which is a resin part held within the frame 29.

[0042] The frame portion 29 is a frame-shaped member made of metal, and forms the outer periphery of the second cover 21. The frame portion 29 has a frame shape corresponding to the base 17, and in this embodiment has a rectangular frame shape. The frame portion 29 is received in the thickness direction by the opening edge portion 17c of the base 17.

[0043] In this state, the frame portion 29 is welded to the opening edge portion 17c of the base 17. Therefore, the second cover 21 is fixed to the base 17 by the welded portion 30, making it possible to close the second space portion 27. With this configuration, the second cover 21 is attached to the base 17 without a gasket. A gasket may be interposed between the second cover 21 and the base 17. In this case, it is also possible to omit the gasket 25 between the first cover 19 and the base 17. In other words, a gasket may be interposed between the base 17 and one or both of the first cover 19 and the second cover 21.

[0044] The width between the inner and outer periphery of frame 29 should be as narrow as possible, but preferably within a range that does not cause the heat of welding to affect main body 31. The material of frame 29 may be aluminum, aluminum alloy, magnesium alloy, titanium, titanium alloy, etc., as long as it can be welded, but it is particularly preferable that it be the same material as base 17.

[0045] The inner periphery of the frame 29 is provided with a holding hole 29a that holds the main body 31. The holding hole 29a is a rectangular hole, but can be changed as appropriate depending on the shape of the main body 31.

[0046] The main body 31 is a plate-like body that fills the holding hole 29a, and is entirely made of a resin portion. Here, "entire area" refers to the entire area of ​​the base material of the main body 31 in a plan view and the entire area in the thickness direction, as with the first cover 19. Therefore, the "entire area" does not include plating 33, an oxide film, or other coatings, which will be described later, on the main body 31. The thickness direction coincides with the plate thickness direction of the main body 31 of the second cover 21.

[0047] The main body 31 is provided within a range facing the second space 27. The surface of the main body 31 in the thickness direction is configured to be flush with the surface of the frame 29. However, the main body 31 may be formed thicker in the thickness direction than the frame 29 and configured to extend into the second space 27. Conversely, the main body 31 may be formed thinner in the thickness direction than the frame 29.

[0048] The position, size, and area of ​​the resin body 31 can be set as desired. The entire surface of the body 31 is covered with plating 33 as a coating to prevent contamination.

[0049] The resin constituting the resin portion is carbon fiber reinforced plastic, as with first cover 19, but any resin may be used as long as it has vibration damping properties. The damping properties here should also be at least higher than those of the metal constituting base 17.

[0050] The main body 31 is formed by adhering a pre-cured material into the holding hole 29a, or by using the frame 29 as a mold and curing it in the holding hole 29a.

[0051] [Disk device operation] In the disk device 1 of this embodiment, when vibrations are input from the outside, they are damped by the main body parts 31 of the first cover 19 and the second cover 21, which are resin parts.

[0052] That is, vibrations input to the second cover 21 are damped in the main body 31 which is a resin part, and the damped vibrations are input from the main body 31 of the second cover 21 to the second space 27.

[0053] At this time, since the main body 31 of the second cover 21 is located within a range facing the second space 27, vibrations can be reliably input to the second space 27. In addition, since the main body 31 of the second cover 21 is provided over the entire area in the thickness direction, vibrations can be reliably input to the second space 27.

[0054] Vibrations input into second space 27 are expanded and damped. These damped vibrations are then input into first cover 19. First cover 19, which is entirely made of resin, reliably receives the input vibrations and damps the input vibrations.

[0055] Vibrations are sufficiently attenuated from the second cover 21 and are not input to the first space 23, or even if vibrations that cannot be fully attenuated from the second cover 21 are input to the first space 23, the vibrations are further expanded and attenuated in the first space 23.

[0056] In this way, in this embodiment, external vibrations can be damped by the resin portions of the first cover 19 and the second cover 21, so that the influence of external noise can be easily suppressed.

[0057] Furthermore, in this embodiment, external vibrations can be damped by the second cover 21, the second space 27, the first cover 19, and the first space 23, and the influence of external noise can be reliably suppressed.

[0058] It is also possible to provide a resin portion on only one of the first cover 19 and the second cover 21. Even in this case, external vibrations can be damped by the resin portion of one of the first cover 19 and the second cover 21, the second space 27, and the first space 23.

[0059] 4 to 6 show modified examples of the first cover 19, with Fig. 4(A), Fig. 5(A), and Fig. 6(A) being plan views and Fig. 4(B), Fig. 5(B), and Fig. 6(B) being cross-sectional views.

[0060] In the modification shown in Fig. 4, first cover 19 is configured by providing resin portion 37 on metal base member 35. In the modification shown in Fig. 4, resin portion 37 is provided only around disc 9 in plan view. Resin portion 37 is attached to recess 19b of first cover 19 by adhesive or the like.

[0061] Therefore, the resin portion 37 is formed only in a part in the plan view and thickness direction of the first cover 19. The recess 19b is provided on the surface of the first cover 19 facing the second space 27, but may be provided on the surface facing the first space 23.

[0062] 5 also has a first cover 19 configured by providing a resin portion 37 on a metal base member 35. The resin portion 37 is attached in a laminated state by adhesive or the like to the surface of the first cover 19 on the side of the first space portion 23. As a result, the resin portion 37 is formed only on a portion of the first cover 19 in a plan view and in the thickness direction.

[0063] The outer periphery of the base member 35 protruding from the resin portion 37 in plan view is received by the step portion 17a of the base 17 of the housing 3, and the resin portion 37 faces the first space portion 23. A gasket 25 is attached to the outer periphery of the base member 35.

[0064] Therefore, the gasket 25 is interposed between the outer periphery of the metal base member 35 and the metal step portion 17a. Therefore, in this modification, a load can be applied to the gasket 25 stably.

[0065] The shape of the first cover 19 in FIG. 5 can also be applied to the second cover 21.

[0066] 6 is configured with a frame portion 39 and a main body portion 41, similar to the second cover 21. In this case, both the first cover 19 and the second cover 21 are configured to include frame portions 39, 29 and main body portions 41, 31.

[0067] The frame portion 39 is received on the step portion 17a of the base 17 of the housing 3, and the main body portion 41 faces the first space portion 23. A gasket 25 is attached to the frame portion 39. Therefore, the gasket 25 is provided between the step portion 17a of the metal base 17 and the frame portion 39 of the metal first cover 19, and a load can be applied to the gasket 25 in a stable manner. [Example]

[0068] 7 is a cross-sectional view showing a schematic configuration of a housing of a disk device according to Example 2 of the present invention. In Example 2, the same reference numerals are used to designate components corresponding to those in Example 1, and redundant explanations will be omitted.

[0069] In this embodiment, the second space 27 is omitted, and the second cover 21 is disposed adjacent to the first cover 19 so as to be in contact with the first cover 19 in the thickness direction.

[0070] In the second embodiment, the first cover 19, the second cover 21, and the first space 23 can damp external vibrations in the same manner as in the first embodiment. Furthermore, in this embodiment, the structure can be simplified.

[0071] The first cover 19 may have the configuration of the modified examples shown in Figures 4 to 6. The second cover 21 may have the configuration of the first cover 19 shown in Figure 5. [Example]

[0072] 8 is a cross-sectional view showing a schematic configuration of a housing of a disk device according to Example 3 of the present invention. In Example 3, components corresponding to those in Example 1 are given the same reference numerals, and duplicated explanations will be omitted.

[0073] In this embodiment, a side wall portion 42 is provided on the second cover 21. The rest is the same as in the first embodiment.

[0074] The side wall portion 42 is formed integrally with the frame portion 29 and is fitted from the outside onto the side wall 18 of the base 17. The side wall portion 42 is joined to the side wall 18 of the base 17 by a welded portion 30.

[0075] The second cover 21 may have the same structure as the first cover 19 shown in FIG. 5, and may further have a side wall 42 provided on the base member.

[0076] In this embodiment, similarly to the first embodiment, external vibrations can be damped. [Example]

[0077] 9 is a cross-sectional view showing a schematic configuration of a housing of a disk device according to Example 4 of the present invention. In Example 4, components corresponding to those in Example 1 are given the same reference numerals, and duplicated explanations will be omitted.

[0078] In this embodiment, a single cover 43 is provided. The cover 43 closes a space 45 inside the housing 3. The rest is the same as in the first embodiment.

[0079] The cover 43 has the same configuration as the first cover 19 of the first embodiment. In this case, the cover 43 may be fixed to the base 17 of the housing 3 by adhesive or the like. The cover 43 may also have the same configuration as the first cover 19 of Figures 4 to 6. In this case, the cover 43 can be fixed to the base 17 by welding.

[0080] The space 45 has the same configuration as the first space 23 of the first embodiment.

[0081] In this embodiment, as in the first embodiment, external vibrations can be damped by the cover 43 and the space 45. [Explanation of symbols]

[0082] 1 Disk device 3. Housing 9. Disk (recording medium) 19 First Cover 21 Second Cover 23 1st space part 25 Gasket 26, 33 Plating 29, 39 Frame 31, 41 Main body 37 Resin part 43 Cover 45 Space section

Claims

1. a housing base for accommodating a recording medium in the disk device; a first cover attached to the base and closing a space in the housing that accommodates the recording medium; a second cover attached to the base outside the first cover; a sealing gasket interposed between the first cover, the second cover, or both of the first cover and the base; one or both of the first cover and the second cover are a resin portion having a part made of resin in a plan view, and a metal portion other than the resin portion being made of metal, the gasket is interposed between the base and the metal portion of one or both of the first cover and the second cover, each having the resin portion and the metal portion; Disk device.

2. 2. The disk device of claim 1, The resin portion extends over the entire area in the thickness direction of one or both of the first cover and the second cover, Disk device.

3. The second cover is provided outside the thickness direction of the first cover and spaced apart from the first cover, and closes a second space defined by the base and the outside of the first cover.

3. The disk device according to claim 1 or 2.

4. A base of a housing that accommodates a recording medium of a disk device; a first cover attached to the base and closing a space in the housing that accommodates the recording medium; a second cover attached to the base outside the first cover; a sealing gasket interposed between the base and one or both of the first cover and the second cover, a disk device in which one or both of the first cover and the second cover are resin parts at least partly made of resin in a plan view; At least a portion of each of the first cover and the second cover is the resin portion in a plan view. Disk device.

5. a housing base for accommodating a recording medium in the disk device; a first cover attached to the base and closing a space in the housing that accommodates the recording medium; a second cover attached to the base outside the first cover; a sealing gasket interposed between the base and one or both of the first cover and the second cover, a disk device in which one or both of the first cover and the second cover are resin parts at least partly made of resin in a plan view; the second cover includes a frame portion made of metal and a main body portion that is the resin portion held within the frame portion, and the frame portion is welded to the base of the housing; Disk device.

6. a housing base for accommodating a recording medium in the disk device; a first cover attached to the base and closing a space in the housing that accommodates the recording medium; a second cover attached to the base outside the first cover; a sealing gasket interposed between the base and one or both of the first cover and the second cover, a disk device in which one or both of the first cover and the second cover are resin parts at least partly made of resin in a plan view; each of the first cover and the second cover includes a frame portion made of metal and a main body portion that is the resin portion held within the frame portion; the gasket is interposed between the frame portion of the first cover and the base, and the frame portion of the second cover is welded to the base; Disk device.

7. A second space is defined between the first cover and the second cover, The main body of the second cover is provided within a range facing the second space.

7. The disk device according to claim 6.

8. a housing base for accommodating a recording medium in the disk device; a first cover attached to the base and closing a space in the housing that accommodates the recording medium; a second cover attached to the base outside the first cover; a sealing gasket interposed between the base and one or both of the first cover and the second cover, a disk device in which one or both of the first cover and the second cover are resin parts at least partly made of resin in a plan view; A coating that covers the resin part is provided. Disk device.

9. The resin is a carbon fiber reinforced plastic. The disk device according to any one of claims 1 to 8.

10. A cover that is attached to the base of a housing that accommodates a recording medium in a disk device, with or without a sealing gasket, In plan view, the device comprises a frame portion made of metal and a main body portion made of resin and held within the frame portion, the frame portion has an outer periphery that abuts against the base with or without the gasket interposed therebetween; cover.

11. A cover according to claim 10, The main body portion extends over the entire area in the plate thickness direction. cover.

12. The cover of claim 10 or 11, The body is covered with a coating. cover.

13. The cover according to any one of claims 10 to 12, The gasket is attached to the frame. cover.

14. The cover according to any one of claims 10 to 13, The resin is a carbon fiber reinforced plastic. cover.

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