Disk device

Abstract

To provide a disk device capable of adsorbing a larger amount of gas onto an adsorbent.SOLUTION: A disk device according to one embodiment includes a housing, a holding member, a moisture absorption unit, and an adsorption unit. The housing includes a base having an internal space and a cover attached to the base to close the internal space. The internal space is filled with a first gas. The holding member is mounted on the base within the internal space and holds a flexible printed circuit board. The moisture absorption unit has a moisture adsorbent configured to adsorb moisture and a case mounted on the cover inside the internal space while storing the moisture adsorbent. The adsorption unit has an adsorbent configured to adsorb a second gas different from the first gas, and is held by at least one of the retaining member and the case outside the case in the internal space and exposed to the internal space.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a disk drive. [Background technology]

[0002] A disk device such as a hard disk drive (HDD) has various components, such as a magnetic disk, a magnetic head, and an adsorbent, as well as a housing to house these components. The adsorbent adsorbs a specific gas inside the housing, preventing the gas from solidifying on the magnetic head and stabilizing the levitation of the magnetic head above the magnetic disk. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent No. 6,008,966 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, an adsorbent may be disposed around a magnetic disk so as to receive the airflow generated by the rotation of the magnetic disk. However, the space around the magnetic disk where a component such as an adsorbent can be disposed is small. Therefore, the adsorbent becomes small, and the amount of gas that the adsorbent can adsorb may be reduced.

[0005] One example of a problem to be solved by the present invention is to provide a disk drive that can cause a larger amount of gas to be adsorbed by an adsorbent. [Means for solving the problem]

[0006] According to one embodiment, a disk drive device includes a housing, a holding member, a moisture absorption unit, and an adsorption unit. The housing includes a base having an internal space and a cover attached to the base to close the internal space. A first gas is filled in the internal space. The holding member is attached to the base in the internal space and holds a flexible printed circuit board. The moisture absorption unit includes a moisture absorbent configured to absorb moisture and a case that houses the moisture absorbent and is attached to the cover in the internal space. The adsorption unit includes an adsorbent configured to adsorb a second gas different from the first gas, and is held by at least one of the holding member and the case outside the case in the internal space and exposed to the internal space. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is an exemplary plan view showing an HDD according to the first embodiment. [Figure 2] FIG. 2 is an exemplary cross-sectional view schematically illustrating a part of the HDD of the first embodiment taken along line F2-F2 in FIG. [Figure 3] FIG. 3 is an exemplary perspective view showing a part of the HDD of the first embodiment. [Figure 4] FIG. 4 is an exemplary perspective view showing a part of an HDD according to the second embodiment. [Figure 5] FIG. 5 is an exemplary cross-sectional view that schematically illustrates a portion of the HDD of the second embodiment. [Figure 6] FIG. 6 is an exemplary perspective view showing a part of an HDD according to the third embodiment. [Figure 7] FIG. 7 is an exemplary cross-sectional view that schematically illustrates a portion of an HDD according to the third embodiment. [Figure 8] FIG. 8 is an exemplary perspective view showing a part of an HDD according to the fourth embodiment. [Figure 9] FIG. 9 is an exemplary cross-sectional view that schematically illustrates a portion of an HDD according to the fourth embodiment. [Figure 10]FIG. 10 is an exemplary perspective view showing a part of an HDD according to the fifth embodiment. [Figure 11] FIG. 11 is an exemplary cross-sectional view that schematically illustrates a portion of an HDD according to the fifth embodiment. [Figure 12] FIG. 12 is an exemplary perspective view showing a part of an HDD according to the sixth embodiment. [Figure 13] FIG. 13 is an exemplary cross-sectional view that schematically illustrates a portion of an HDD according to the sixth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] (First embodiment) A first embodiment will be described below with reference to FIGS. 1 to 3. In this specification, components according to the embodiment and descriptions of the components may be described using multiple expressions. The components and their descriptions are merely examples and are not limited by the expressions in this specification. The components may also be identified by names different from those in this specification. Furthermore, the components may also be described using expressions different from those in this specification.

[0009] In the following description, "suppress" is defined as, for example, preventing an event, action, or influence from occurring, or reducing the severity of an event, action, or influence. Also, in the following description, "restrict" is defined as, for example, preventing movement or rotation, or allowing movement or rotation within a predetermined range and preventing movement or rotation beyond the predetermined range.

[0010] Fig. 1 is an exemplary plan view showing a hard disk drive (HDD) 10 according to a first embodiment. Fig. 2 is an exemplary cross-sectional view schematically showing a portion of the HDD 10 of the first embodiment taken along line F2-F2 in Fig. 1. The HDD 10 is an example of a disk device, and may also be referred to as an electronic device, a storage device, an external storage device, or a magnetic disk device.

[0011] As shown in the drawings, for convenience, the X-axis, Y-axis, and Z-axis are defined in this specification. The X-axis, Y-axis, and Z-axis are perpendicular to one another. The X-axis is aligned along the width of the HDD 10. The Y-axis is aligned along the length of the HDD 10. The Z-axis is aligned along the thickness of the HDD 10.

[0012] Furthermore, in this specification, the X direction, Y direction, and Z direction are defined. The X direction is a direction along the X axis, and includes the +X direction indicated by the X axis arrow and the -X direction opposite to the X axis arrow. The Y direction is a direction along the Y axis, and includes the +Y direction indicated by the Y axis arrow and the -Y direction opposite to the Y axis arrow. The Z direction is a direction along the Z axis, and includes the +Z direction indicated by the Z axis arrow and the -Z direction opposite to the Z axis arrow.

[0013] 1 and 2, an HDD 10 includes a housing 11, multiple magnetic disks 12, a spindle motor 13, a head stack assembly (HSA) 14, a voice coil motor (VCM) 15, a ramp load mechanism 16, a printed circuit board (PCB) 17 (shown in FIG. 2), a moisture absorption unit 18, and an adsorption unit 19. The magnetic disks 12 may also be called disks or platters.

[0014] As shown in Fig. 2, the housing 11 has a base 21, an inner cover 22, an outer cover 23, and a relay board 24. Note that the housing 11 is not limited to this example. For convenience, Fig. 1 omits the inner cover 22 and the outer cover 23. The inner cover 22 is an example of a cover.

[0015] 1, the base 21 is formed in a substantially rectangular box shape that is open in the +Z direction. The base 21 has a bottom wall 25 and side walls 26. The bottom wall 25 is formed in a substantially rectangular (quadrilateral) plate shape that extends substantially perpendicular to the Z direction. The side walls 26 protrude from the edges of the bottom wall 25 in the substantially +Z direction and are formed in a substantially rectangular frame shape.

[0016] An internal space S is provided in the base 21. The internal space S is formed (defined, partitioned) by a bottom wall 25 and a side wall 26. The side wall 26 surrounds the internal space S. A plurality of magnetic disks 12, a spindle motor 13, an HSA 14, a VCM 15, a ramp load mechanism 16, a moisture absorption unit 18, and an adsorption unit 19 are arranged in the internal space S.

[0017] 2, the inner cover 22 is attached to the base 21. For example, the inner cover 22 is attached to the end of the side wall 26 in the +Z direction by, for example, screws 28. In this way, the inner cover 22 closes the internal space S.

[0018] The inner cover 22 has an inner surface 22a and an outer surface 22b. The inner surface 22a faces the internal space S, the bottom wall 25, and the end of the side wall 26 in the +Z direction. The outer surface 22b is located opposite the inner surface 22a.

[0019] An endless gasket 29 is interposed between the inner surface 22a of the inner cover 22 and the side wall 26. The gasket 29 provides an airtight seal between the inner cover 22 and the side wall 26. The gasket 29 is made of, for example, synthetic rubber with low helium permeability. However, the gasket 29 may also be made of other materials.

[0020] The outer cover 23 covers the inner cover 22 and is attached to the base 21. For example, the outer cover 23 is attached by welding to the end of the side wall 26 in the +Z direction. As a result, the outer cover 23 airtightly seals the inside of the housing 11, including the internal space S. The outer cover 23 may be omitted.

[0021] For example, a vent hole is provided in each of the inner cover 22 and the outer cover 23. After components are placed in the internal space S and the internal cover 22 is attached to the base 21, the air in the internal space S is evacuated through the vent hole. Furthermore, a gas other than air is filled into the internal space S through the vent hole.

[0022] The gas filled in the internal space S is, for example, a low-density gas having a density lower than that of air, or an inert gas having low reactivity. For example, helium is filled in the internal space S. Helium is an example of the first gas. Note that other fluids may also be filled in the internal space S.

[0023] At least one of the ventilation holes of the inner cover 22 and the outer cover 23 is airtightly sealed with a seal such as an aluminum seal. The seal restricts helium in the internal space S from leaking out of the housing 11 through the ventilation hole.

[0024] A through hole 31 is provided in the bottom wall 25. The through hole 31 penetrates the bottom wall 25 in approximately the Z direction so as to connect the internal space S with the outside. The relay board 24 is attached to the bottom wall 25 so as to airtightly close the through hole 31. The relay board 24 has a board 35 and two relay connectors 36 and 37.

[0025] The substrate 35 is a rigid substrate such as a glass epoxy substrate. The substrate 35 covers the through-hole 31 and is attached to the bottom wall 25. The substrate 35 airtightly seals the through-hole 31. Two relay connectors 36 and 37 are mounted on both sides of the substrate 35 and are electrically connected to each other.

[0026] 1, the magnetic disks 12 are formed into a disk shape that extends perpendicular to the Z direction. The magnetic disks 12 are arranged in the Z direction with intervals between them. Magnetic recording layers are provided on both sides of the magnetic disks 12.

[0027] The spindle motor 13 supports a plurality of magnetic disks 12. The plurality of magnetic disks 12 are arranged at intervals along a central axis Axd of the magnetic disks 12. The central axis Axd is an imaginary axis extending substantially in the Z direction. The plurality of magnetic disks 12 are held on a hub of the spindle motor 13 by, for example, a clamp spring.

[0028] The spindle motor 13 rotates the plurality of magnetic disks 12 together around a central axis Axd. The central axis Axd is also the center of rotation of the magnetic disks 12 and the spindle motor 13. However, the central axis Axd is not limited to this example.

[0029] The housing 11 further has a support shaft 41 spaced apart from the magnetic disk 12. The support shaft 41 protrudes, for example, from the bottom wall 25 in approximately the +Z direction. The HSA 14 is rotatably supported by the support shaft 41.

[0030] The HSA 14 can rotate around a central axis Axh. The central axis Axh is an imaginary axis extending substantially in the Z direction. The central axis Axh is, for example, the center of rotation of the HSA 14 and also the central axis of the support shaft 41.

[0031] The HSA 14 includes a carriage 45, a plurality of head gimbal assemblies (HGA) 46, a flexible printed circuit board (FPC) 47, a support plate 48, and a relay connector 49 shown in FIG. 2. The support plate 48 is an example of a holding member. As shown in FIG. 1, the carriage 45 includes an actuator block 51 and a plurality of arms 52.

[0032] The actuator block 51 is attached to the support shaft 41 via a bearing so as to be rotatable around the central axis Axh, for example. The arms 52 protrude from the actuator block 51 substantially parallel to each other in a direction substantially perpendicular to the central axis Axh.

[0033] Each of the multiple HGAs 46 has a magnetic head 61 and a suspension 62. The magnetic head 61 may also be referred to as a slider. The magnetic head 61 records and reproduces information on a corresponding one of the multiple magnetic disks 12. In other words, the magnetic head 61 reads and writes information from and to the magnetic disk 12. The suspension 62 is attached to the arm 52 and holds the magnetic head 61.

[0034] The suspension 62 has a base plate 65, a load beam 66, and a flexure 67. The base plate 65 is attached to the tip of the arm 52. The load beam 66 is formed in a plate shape that is thinner than the base plate 65. The load beam 66 is attached to the base plate 65 and extends from the base plate 65.

[0035] The flexure 67 is a type of flexible printed wiring board formed in a long, thin strip shape, and includes, for example, a metal backing plate, an insulating base layer, a conductive layer, and an insulating cover layer.

[0036] The flexure 67 extends along the arm 52, the base plate 65, and the load beam 66. A rotatable gimbal portion is provided at one end 67a of the flexure 67. The magnetic head 61 is attached to the gimbal portion of the flexure 67.

[0037] One end 47a of the FPC 47 is attached to the actuator block 51. The other ends 67b of the multiple flexures 67 are connected to the end 47a of the FPC 47. Therefore, the flexures 67 electrically connect the magnetic head 61 and the FPC 47.

[0038] The other end 47b of the FPC 47 is attached to a support plate 48. The support plate 48 is made of, for example, metal or synthetic resin. The rigidity of the support plate 48 is higher than the rigidity of the FPC 47. The support plate 48 has a bottom plate 71 and a standing plate 72. The bottom plate 71 is an example of a first wall. The standing plate 72 is an example of a second wall.

[0039] The bottom plate 71 is disposed along the bottom wall 25 of the base 21. The bottom plate 71 is, for example, spaced apart from the magnetic disk 12 in the approximately −Y direction and attached to the bottom wall 25 with screws. That is, the bottom plate 71 is attached to the base 21 in the internal space S.

[0040] An end 47b of the FPC 47 is attached to the bottom plate 71. That is, the support plate 48 holds the FPC 47. As shown in FIG. 2, a relay connector 49 is mounted on the end 47b. The bottom plate 71 reinforces the end 47b of the FPC 47 on which the relay connector 49 is mounted. The relay connector 49 is connected to the relay connector 36 of the relay board 24.

[0041] The standing plate 72 extends substantially in the Z direction from an end of the bottom plate 71 in the +Y direction. In other words, the standing plate 72 extends from the bottom plate 71 toward the inner cover 22. The standing plate 72 holds the FPC 47 so that the width of the FPC 47 between the two ends 47a, 47b is substantially the same in the Z direction. The standing plate 72 is disposed, for example, along the XZ plane. Note that the standing plate 72 is not limited to this example.

[0042] As shown in FIG. 1, the FPC 47 further has a flexible portion 47c. The flexible portion 47c is provided between the actuator block 51 and the standing plate 72. In other words, the flexible portion 47c is provided between the two ends 47a, 47b. The flexible portion 47c is bent due to elastic deformation, and alleviates the influence of rotation of the carriage 45. The standing plate 72 supports the end 47b connected to the flexible portion 47c.

[0043] The VCM 15 has a voice coil, a pair of yokes, and a magnet attached to the yokes. The voice coil is held by an actuator block 51. The VCM 15 rotates a carriage 45 around a central axis Axh to move the magnetic head 61 to a desired position.

[0044] When the magnetic head 61 moves to the outer edge of the magnetic disk 12 due to the rotation of the HSA 14 by the VCM 15 , the ramp load mechanism 16 holds the magnetic head 61 at a position separated from the magnetic disk 12 .

[0045] 2, the PCB 17 is disposed outside the internal space S and attached to the bottom wall 25. The PCB 17 has a printed wiring board (PWB) 81 and a relay connector 82. The PWB 81 is, for example, a rigid board such as a glass epoxy board, and may be a multilayer board or a build-up board.

[0046] The relay connector 82 is mounted on the PWB 81. The relay connector 82 is connected to the relay connector 37 of the relay board 24. As a result, the PCB 17 is electrically connected to the magnetic head 61 through the relay board 24, the FPC 47, and the flexure 67.

[0047] The PCB 17 further includes various electronic components mounted on the PWB 81, such as an interface (I / F) connector connected to a host computer and a controller that controls the operation of the HDD 10. The controller on the PCB 17 controls the spindle motor 13, the VCM 15, and the magnetic head 61 through relay connectors 82, 37, 36, and 49.

[0048] The moisture absorption unit 18 has a case 91, a moisture absorbent 92, and a filter 93. The moisture absorption unit 18 causes the moisture in the internal space S to be absorbed by the moisture absorbent 92. The moisture absorption unit 18 may be a breather filter that collects predetermined gases from the gases passing through the ventilation holes of the inner cover 22. The moisture absorption unit 18 is not limited to the above example.

[0049] The case 91 is made of, for example, a synthetic resin or metal with low helium permeability. The case 91 is attached to the inner surface 22a of the inner cover 22 in the internal space S with, for example, double-sided tape or adhesive. The case 91 has a storage portion 95 and a mounting wall 96.

[0050] The storage section 95 is formed in a box shape that is open in the -Z direction. A storage chamber R is provided inside the storage section 95. The storage section 95 stores the moisture absorbent 92 in the storage chamber R. When the moisture absorption unit 18 is a breathing filter, the storage chamber R communicates with the ventilation hole of the inner cover 22.

[0051] The accommodation portion 95 is, for example, adjacent to the standing plate 72 of the support plate 48. The accommodation portion 95 is spaced apart from the standing plate 72 in approximately the +Y direction. Therefore, the accommodation portion 95 is located between the magnetic disk 12 and the standing plate 72. Note that the position of the accommodation portion 95 is not limited to this example.

[0052] 3 is an exemplary perspective view showing a portion of the HDD 10 of the first embodiment. For convenience, the perspective views including FIG. 3 omit the PCB 17, the inner cover 22, and the outer cover 23. As shown in FIG. 3, the mounting wall 96 has a crossing portion 101, a mounting portion 102, and an intermediate portion 103.

[0053] The traverse portion 101 extends from the storage portion 95 in approximately the -Y direction. The traverse portion 101 extends along the inner surface 22a of the inner cover 22 so as to traverse the standing plate 72 of the support plate 48. In other words, the end of the traverse portion 101 in the -Y direction is spaced apart from the standing plate 72 in approximately the -Y direction. The traverse portion 101 is attached to the inner surface 22a of the inner cover 22. Note that the traverse portion 101 may be spaced apart from the inner cover 22.

[0054] The mounting portion 102 is spaced apart from the housing 11 and the storage portion 95. That is, the mounting portion 102 is spaced apart from the bottom wall 25 of the base 21 in the +Z direction and from the inner cover 22 in the -Z direction. In addition, the mounting portion 102 is spaced apart from the storage portion 95 and the standing plate 72 in the -Y direction.

[0055] As shown in Fig. 2, the mounting portion 102 has an upper surface 102a and a lower surface 102b. The expressions "upper" and "lower" in this embodiment are used for convenience based on the arrangement in Fig. 2, and do not limit the position, orientation, or usage mode. The upper surface 102a is an example of a fourth surface. The lower surface 102b is an example of a fifth surface.

[0056] The upper surface 102a is formed to be substantially flat and faces substantially in the +Z direction. The upper surface 102a faces the inner surface 22a of the inner cover 22 via a gap. The lower surface 102b is located on the opposite side of the upper surface 102a. The lower surface 102b is formed to be substantially flat and faces substantially in the -Z direction. The lower surface 102b faces the bottom wall 25 of the base 21 via a gap.

[0057] A through hole 105 is provided in the mounting portion 102. The through hole 105 penetrates the mounting portion 102 substantially in the Z direction. Therefore, the through hole 105 opens to the upper surface 102a and the lower surface 102b. Note that the through hole 105 may be a notch that also opens to the edge of the mounting portion 102.

[0058] The intermediate portion 103 connects the crossing portion 101 and the mounting portion 102. For example, the intermediate portion 103 extends substantially in the Z direction between the end of the crossing portion 101 in the -Y direction and the end of the mounting portion 102 in the +Y direction.

[0059] The moisture absorbent 92 is, for example, silica gel, and therefore absorbs moisture. However, the moisture absorbent 92 may be other substances such as activated carbon, quicklime (CaO), or molecular sieves.

[0060] The filter 93 is, for example, a membrane filter. The filter 93 is attached to an end of the accommodation portion 95 in the −Z direction. As a result, the filter 93 closes the accommodation chamber R so that gas can pass through.

[0061] The adsorption unit 19 includes an adsorbent 111 and a membrane 112. Note that the adsorption unit 19 is not limited to this example. The membrane 112 may also be referred to as a container, for example. The adsorption unit 19 adsorbs a predetermined gas in the internal space S to the adsorbent 111.

[0062] The adsorbent 111 is a gas collector such as activated carbon. The adsorbent 111 adsorbs various organic substances including gases. The gas (organic gas) adsorbed by the activated carbon is an example of a second gas, and is different from the helium filled in the internal space S. The activated carbon that is the adsorbent 111 may further adsorb moisture.

[0063] The membrane 112 is made of a breathable film that can retain the adsorbent 111. In other words, the membrane 112 restricts the adsorbent 111 from passing through the membrane 112. The membrane 112 has a plate portion 115 and an enclosure portion 116. The enclosure portion 116 is an example of a protrusion.

[0064] Plate portion 115 is a part of film 112 formed into a plate shape by, for example, stacking multiple films or a thickly formed film. However, plate portion 115 is not limited to this example. Plate portion 115 has an upper surface 115a and a lower surface 115b. Lower surface 115b is an example of a third surface.

[0065] The upper surface 115a is formed to be approximately flat and faces approximately in the +Z direction. The upper surface 115a is attached to the lower surface 102b of the mounting portion 102, for example, with double-sided tape or adhesive. The upper surface 115a surrounds the through-hole 105 that opens into the lower surface 102b of the mounting portion 102. The lower surface 115b is located on the opposite side of the upper surface 115a. The lower surface 115b is formed to be approximately flat and faces approximately in the -Z direction.

[0066] The enclosure 116 is made of a film that is thinner than the plate portion 115. The enclosure 116 covers the adsorbent 111. In this embodiment, the enclosure 116 encloses the adsorbent 111 so as to have a substantially rectangular parallelepiped shape. Note that the shapes of the adsorbent 111 and the enclosure 116 are not limited to this example.

[0067] The enclosure 116 protrudes substantially in the -Z direction from the lower surface 115b of the plate portion 115. Therefore, when the plate portion 115 is attached to the lower surface 102b of the attachment portion 102, the enclosure 116 protrudes from the lower surface 102b. The enclosure 116 has an upper surface 116a, a lower surface 116b, and a side surface 116c. The lower surface 116b is an example of a second surface.

[0068] The upper surface 116a is formed to be substantially flat and faces substantially in the +Z direction. The upper surface 116a of the container 116 and the upper surface 115a of the plate 115 are located on substantially the same plane and are continuous with each other. Therefore, the suction unit 19 of this embodiment has an integral upper surface 19a. The upper surface 19a is an example of a first surface.

[0069] The upper surface 19a includes upper surfaces 115a and 116a that are continuous with each other. Therefore, the lower surface 115b of the plate portion 115 is located on the opposite side of the upper surface 19a (upper surface 115a). Furthermore, the upper surface 19a (upper surface 115a) is attached to the lower surface 102b of the attachment portion 102. Therefore, the adsorption unit 19 can be attached to the case 91 of the moisture absorbent unit 18 after the moisture absorbent unit 18 has been attached to the inner cover 22 and immediately before the inner cover 22 is attached to the base 21.

[0070] Unlike the moisture absorbent 92, the adsorption unit 19 is held in the case 91 outside the case 91 in the internal space S. In this embodiment, the adsorption unit 19 is attached to the case 91 of the moisture absorption unit 18. The adsorption unit 19 may also be held on the support plate 48.

[0071] The lower surface 116b of the enclosure 116 is located on the opposite side to the upper surface 116a (upper surface 19a). The lower surface 116b of the enclosure 116 is farther away from the attachment portion 102 in the -Z direction than the lower surface 115b of the plate portion 115. The side surface 116c extends approximately in the Z direction between the lower surface 116b of the enclosure 116 and the lower surface 115b of the plate portion 115.

[0072] Of the upper surface 19a, the upper surface 116a of the enclosure 116 is exposed to the internal space S through the through-hole 105. Furthermore, the lower surface 116b and the side surface 116c of the enclosure 116 are exposed to the internal space S. The upper surface 116a, the lower surface 116b, and the side surface 116c are not in overall contact with other members, and are not housed by other members in the internal space S. In other words, the suction unit 19 is exposed to the internal space S. Note that the upper surface 116a, the lower surface 116b, and the side surface 116c may be in partial or temporary contact with other components.

[0073] The suction unit 19 and the mounting portion 102 at least partially overlap the bottom plate 71 of the support plate 48 in the Z direction. In other words, the suction unit 19 and the mounting portion 102 at least partially cover the bottom plate 71 in the Z direction. In yet another way, the suction unit 19 is spaced apart from the magnetic disk 12 and disposed near the support plate 48. Note that the suction unit 19 may be disposed near the support plate 48 while being spaced apart from the support plate 48 and the case 91.

[0074] The adsorbent 111 adsorbs organic gases through the upper surface 116a, the lower surface 116b, and the side surface 116c. That is, the upper surface 116a (upper surface 19a), the lower surface 116b, and the side surface 116c, through which the organic gases pass, are provided on the breathable film 112. The lower surface 116b and the side surface 116c are provided on the enclosure portion 116 of the film 112, which protrudes from the lower surface 115b of the plate portion 115.

[0075] Since the suction unit 19 is attached to the attachment portion 102, the suction unit 19 is located farther from the magnetic disk 12 than the moisture absorbent 92 and the storage portion 95. The suction unit 19 is also located farther from the magnetic disk 12 than the standing plate 72 of the support plate 48.

[0076] 1, the internal space S has, for example, a first space S1, a second space S2, a first passage P1, a second passage P2, and a third passage P3. The first space S1, the second space S2, the first passage P1, and the second passage P2 are partitioned by, for example, the side wall 26 of the housing 11, the VCM 15, the storage section 95 of the suction unit 19, and the standing plate 72 of the support plate 48. Note that the partitioning of the internal space S is not limited to this example.

[0077] The first space S1 is a portion of the internal space S in which the multiple magnetic disks 12 and the spindle motor 13 are arranged. The second space S2 is a portion of the internal space S in which the suction unit 19, the bottom plate 71 of the support plate 48, and the mounting portion 102 of the case 91 are arranged.

[0078] The standing plate 72 and the storage portion 95 are located between the first space S1 and the second space S2. In other words, the standing plate 72 and the storage portion 95 separate the first space S1 and the second space S2. Gaps that connect the first space S1 and the second space S2 are provided between the bottom wall 25 of the base 21 and the storage portion 95, and between the standing plate 72 and the case 91.

[0079] The first passage P1 and the second passage P2 each communicate the first space S1 and the second space S2. The second passage P2 is spaced apart from the first passage P1 in the +X direction. The first passage P1 is provided, for example, between the VCM 15 and the accommodation portion 95. For example, the actuator block 51 is disposed in the first passage P1. The second passage P2 is provided between the side wall 26 and the accommodation portion 95. For example, the ramp load mechanism 16 is disposed in the second passage P2.

[0080] The third passage P3 is provided in the sidewall 26 around the periphery of the first space S1. Both ends of the third passage P3 are connected to the first space S1. The HDD 10 further includes an adsorption filter 120 disposed in the third passage P3. The adsorption filter 120, like the adsorbent 111, adsorbs organic gases.

[0081] Almost the entire area of the first space S1 is occupied by the multiple magnetic disks 12. Around the periphery of the first space S1, a sidewall 26 extends along the outer periphery of the magnetic disks 12 and acts as a shroud to suppress the generation of turbulence. For this reason, it is difficult to place components other than the magnetic disks 12 and the spindle motor 13 in the first space S1.

[0082] A third passage P3 is provided in the sidewall 26 around the first space S1, and an adsorption filter 120 is disposed in the third passage P3. However, if the diameter of the magnetic disk 12 is increased to increase the storage capacity of the HDD 10, the sidewall 26 becomes thinner and the third passage P3 also becomes smaller. For this reason, the adsorption filter 120 in the third passage P3 is relatively small.

[0083] As the HSA 14 rotates, the HGA 46, the flexible portion 47c of the FPC 47, and the arm 52 move in the first passage P1 and the second passage P2. In the first passage P1 and the second passage P2, the space that does not interfere with the rotating HSA 14 is small. For this reason, it is difficult to place other components in the first passage P1 and the second passage P2.

[0084] On the other hand, the second space S2 is separated from the magnetic disk 12 and the HSA 14. Therefore, components placed in the second space S2 are less likely to affect the aerodynamic characteristics around the magnetic disk 12 and are less likely to interfere with the rotating HSA 14. Therefore, the space available for placing components in the second space S2 is relatively large.

[0085] When the magnetic disk 12 rotates, an airflow is generated in the internal space S. A part of the airflow generated by the rotation of the magnetic disk 12 passes through the third passage P3. The adsorption filter 120 adsorbs and collects organic gases from the airflow.

[0086] 1, another part of the airflow generated by the rotation of the magnetic disk 12 flows from the first space S1 through the first passage P1 into the second space S2. That is, helium flows relatively fast in the second space S2 where the adsorption unit 19 is disposed.

[0087] In the second space S2, the adsorption unit 19 is exposed to the airflow. The adsorbent 111 of the adsorption unit 19 efficiently adsorbs and collects organic gases from the airflow through the upper surface 116a, the lower surface 116b, and the side surface 116c that are exposed to the airflow.

[0088] The airflow that has passed through the second space S2 returns to the first space S1 through the second passage P2. That is, the rotating magnetic disk 12 generates an airflow that circulates through the first space S1, the first passage P1, the second space S2, and the second passage P2. The adsorption unit 19 removes organic gases from the circulating airflow.

[0089] On the other hand, when the magnetic disk 12 is stopped, the helium in the internal space S is almost stopped. However, because the second space S2 is relatively large, the size and surface area of the adsorbent 111 can be set large. Therefore, even in the helium that is almost stopped, the adsorbent 111 adsorbs a larger amount of organic gas.

[0090] In the HDD 10 according to the first embodiment described above, the housing 11 includes a base 21 having an internal space S, and an inner cover 22 attached to the base 21 to close the internal space S. Helium is filled into the internal space S. A support plate 48 is attached to the base 21 in the internal space S and holds an FPC 47. The moisture absorption unit 18 includes a moisture absorbent 92 and a case 91. The case 91 houses the moisture absorbent 92 and is attached to the internal cover 22 in the internal space S. The adsorption unit 19 includes an adsorbent 111 configured to adsorb organic gases other than helium. The adsorption unit 19 is held by at least one of the support plate 48 and the case 91 outside the case 91 in the internal space S and is exposed to the internal space S.

[0091] Generally, the space available for component placement near the magnetic disk 12 and the carriage 45 is small. The magnetic disk 12 is adjacent to the sidewall 26 of the base 21, and when the diameter of the magnetic disk 12 is enlarged to increase storage capacity, the sidewall 26 of the base 21 is made thinner. Therefore, the space available for placement in the sidewall 26 of the base 21 (the third passage P3) is small. The carriage 45 rotates the arm 52 and the HGA 46 and deforms the FPC 47 in response to the rotation. Therefore, the space outside the movement ranges of the arm 52, the HGA 46, and the FPC 47 is small. On the other hand, the space available for component placement near the support plate 48 and the case 91 is relatively large. The suction unit 19 is disposed near at least one of the support plate 48 and the case 91. Therefore, the suction unit 19 can be enlarged, thereby increasing the surface area of the suction material 111. Furthermore, airflow generated by the rotation of the magnetic disk 12 generally passes through the space (second space S2) near the support plate 48 and the case 91. This allows the suction unit 19 to be efficiently exposed to the airflow. Therefore, the HDD 10 of this embodiment can adsorb a larger amount of organic gas to the adsorbent 111, and can prevent the organic gas from interfering with the stable levitation of the magnetic head 61. Stabilizing the levitation of the magnetic head 61 allows the HDD 10 to increase its storage capacity.

[0092] Conventional HDDs may also have a moisture absorption unit and a support plate. In the HDD 10 of this embodiment, the suction unit 19 is held by at least one of the case 91 of the moisture absorption unit 18 and the support plate 48. This allows the HDD 10 to suppress an increase in the number of parts, and ultimately suppresses an increase in costs.

[0093] The magnetic disk 12 is arranged in the internal space S and is configured to rotate. The suction unit 19 is located farther from the magnetic disk 12 than the moisture absorbent 92. As described above, the space available for arranging components is smaller near the magnetic disk 12 than near the arm 52 of the carriage 45 that moves along the magnetic disk 12. The moisture absorption unit 18 separates the suction unit 19 from the magnetic disk 12 and the arm 52 of the carriage 45. The suction unit 19 can be arranged in a relatively large space separated from the magnetic disk 12 and the arm 52 of the carriage 45, and can be made larger.

[0094] The support plate 48 has a bottom plate 71 attached to the case 91 and a standing plate 72 extending from the bottom plate 71 toward the inner cover 22. The suction unit 19 is located farther away from the magnetic disk 12 than the standing plate 72. Therefore, a space (second space S2) that is at least larger than the bottom plate 71 and in which components can be placed is provided between the standing plate 72 and the side wall 26 of the base 21. Therefore, the suction unit 19 can be placed in this relatively large space, allowing it to be made larger.

[0095] The internal space S has a first space S1, a second space S2, a first passage P1, and a second passage P2. The magnetic disk 12 is disposed in the first space S1. The suction unit 19 is disposed in the second space S2. The first passage P1 connects the first space S1 to the second space S2. The second passage P2 is spaced apart from the first passage P1 and connects the first space S1 to the second space S2. The airflow generated by the magnetic disk 12 in the first space S1 can circulate through the first passage P1, the second space S2, and the second passage P2. This allows the suction unit 19 disposed in the second space S2 to be efficiently exposed to the airflow.

[0096] The adsorption unit 19 has an upper surface 19a exposed to the internal space S, and a lower surface 116b located on the opposite side of the upper surface 19a and exposed to the internal space S. The adsorbent 111 adsorbs the organic gas through the upper surface 19a and also through the lower surface 116b. This allows the adsorption unit 19 to have a larger surface area through which the organic gas passes, allowing a larger amount of the organic gas to be adsorbed by the adsorbent 111.

[0097] The adsorption unit 19 has a breathable membrane 112 that covers an adsorbent 111. An upper surface 19a and a lower surface 116b are provided on the membrane 112. This allows the adsorption unit 19 to be easily manufactured.

[0098] The suction unit 19 is attached to the case 91. This allows the suction unit 19 to be attached to the case 91 outside the internal space S before the inner cover 22 is attached to the base 21. Therefore, the HDD 10 can be easily assembled.

[0099] The case 91 has a storage section 95 that stores the moisture absorbent 92, and a mounting wall 96 that extends from the storage section 95 and has a through-hole 105 formed therein. The adsorption unit 19 has a lower surface 115b located opposite to an upper surface 19a, and an enclosure 116 that protrudes from the lower surface 115b. The upper surface 19a is attached to the mounting wall 96 and is exposed to the internal space S through the through-hole 105. The lower surface 116b is provided in the enclosure 116. This allows the adsorption unit 19 to have a larger surface area through which the organic gas passes, allowing a larger amount of the organic gas to be adsorbed by the adsorbent 111.

[0100] (Second embodiment) The second embodiment will be described below with reference to Figures 4 and 5. In the following description of the embodiments, components having the same functions as components already described are given the same reference numerals as the components already described, and further description may be omitted. Furthermore, components given the same reference numerals do not necessarily have all the same functions and properties, and may have different functions and properties according to each embodiment.

[0101] Fig. 4 is an exemplary perspective view showing a portion of an HDD 10 according to the second embodiment. Fig. 5 is an exemplary cross-sectional view schematically showing a portion of an HDD 10 according to the second embodiment. As shown in Fig. 5, the membrane 112 according to the second embodiment has an enclosure 211 instead of the enclosure 116. The enclosure 211 is substantially the same as the enclosure 116, except for the points described below.

[0102] The enclosure 211 protrudes not only from the lower surface 115b of the plate portion 115 but also from the upper surface 115a. The enclosure 211 passes through the through-hole 105 so as to protrude from the upper surface 102a of the mounting portion 102. In other words, the enclosure 211 is fitted into the through-hole 105. As in the first embodiment, the enclosure 211 protrudes from the lower surface 102b.

[0103] The upper surface 211a of the enclosure 211 is exposed to the internal space S at a position spaced apart from the upper surface 102a of the mounting portion 102 in the approximately +Z direction. The lower surface 211b of the enclosure 211 is exposed to the internal space S at a position spaced apart from the lower surface 102b of the mounting portion 102 in the approximately -Z direction. The side surface 211c of the enclosure 211 is exposed to the internal space S at a position closer to the inner cover 22 than the mounting portion 102 and at a position closer to the bottom wall 25 of the base 21 than the mounting portion 102.

[0104] In the HDD 10 of the second embodiment described above, the case 91 has a storage compartment 95 that stores the moisture absorbent 92 and a mounting wall 96 extending from the storage compartment 95. The mounting wall 96 has an upper surface 102a and a lower surface 102b opposite the upper surface 102a. The mounting wall 96 is provided with a through-hole 105 that opens to the upper surface 102a and the lower surface 102b. The adsorption unit 19 is fitted into the through-hole 105 so as to protrude from both the upper surface 102a and the lower surface 102b. This allows the adsorption unit 19 to have a larger surface area through which the organic gas passes, allowing a larger amount of the organic gas to be adsorbed by the adsorbent 111.

[0105] (Third embodiment) The third embodiment will be described below with reference to Figures 6 and 7. Figure 6 is an exemplary perspective view showing a portion of an HDD 10 according to the third embodiment. Figure 7 is an exemplary cross-sectional view schematically showing a portion of an HDD 10 of the third embodiment.

[0106] 9, the HSA 14 of the third embodiment has a support plate 310 instead of the support plate 48. The support plate 310 is substantially the same as the support plate 48, except for the points described below. The support plate 310 has a holding plate 311. The holding plate 311 protrudes from the bottom plate 71 in the vicinity of the standing plate 72, approximately in the +Z direction.

[0107] The case 91 of the third embodiment has a mounting wall 321 instead of the mounting wall 96. The mounting wall 321 extends substantially in the −Y direction from the storage portion 95. The mounting wall 321 extends along the inner surface 22a of the inner cover 22 so as to cross the upright plate 72 of the support plate 310.

[0108] The HDD 10 of the third embodiment further includes an elastic body 331. The elastic body 331 is made of, for example, synthetic rubber. The elastic body 331 is attached to the mounting wall 321 of the case 91 at a position spaced apart from the standing plate 72 in the approximately -Y direction. The elastic body 331 is located between the support plate 310 and the mounting wall 321. The elastic body 331 may also be attached to the bottom plate 71 of the support plate 310.

[0109] The suction unit 19 of the third embodiment further includes a mounting member 340. The mounting member 340 is an example of a member. The mounting member 340 is made of, for example, synthetic resin or metal. The mounting member 340 includes an interposing portion 341 and a mounting portion 342.

[0110] The interposed portion 341 extends substantially in the Z direction. An end portion of the interposed portion 341 in the -Z direction is held between the standing plate 72 of the support plate 310 and the holding plate 311. An end portion of the interposed portion 341 in the +Z direction presses the elastic body 331 and is held by the elastically deformed elastic body 331. In other words, the interposed portion 341 of the mounting member 340 is held between the support plate 310 and the elastic body 331.

[0111] The attachment portion 342 protrudes substantially in the −Y direction from the interposition portion 341. The attachment portion 342 is spaced apart from the housing 11 and the accommodation portion 95. The attachment portion 342 has an upper surface 342a and a lower surface 342b.

[0112] The upper surface 342a is formed to be substantially flat and faces substantially in the +Z direction. The upper surface 342a faces the inner surface 22a of the inner cover 22 via a gap. The lower surface 342b is located on the opposite side of the upper surface 342a. The lower surface 342b is formed to be substantially flat and faces substantially in the -Z direction. The lower surface 342b faces the bottom wall 25 of the base 21 and the bottom plate 71 of the support plate 310 via a gap.

[0113] A through hole 345 is provided in the mounting portion 342. The through hole 345 penetrates the mounting portion 342 substantially in the Z direction. Therefore, the through hole 345 opens to an upper surface 342a and a lower surface 342b. Note that the through hole 345 may be a notch that also opens to an edge of the mounting portion 342.

[0114] For example, the suction unit 19 of the second embodiment is attached to the attachment portion 342. Note that the suction unit 19 of the first embodiment may also be attached to the attachment portion 342. The upper surface 115a of the plate portion 115 is attached to the lower surface 342b of the attachment portion 342. That is, the attachment member 340 supports the adsorbent 111 via the membrane 112.

[0115] The enclosure 211 passes through the through-hole 345 so as to protrude from the upper surface 342a of the attachment portion 342. In other words, the enclosure 211 is fitted into the through-hole 345. The enclosure 211 also protrudes from the lower surface 342b.

[0116] In the HDD 10 of the third embodiment described above, the elastic body 331 is attached to one of the support plate 310 and the case 91. The suction unit 19 has a mounting member 340 that is held between the other of the support plate 310 and the case 91 and the elastic body 331, and that supports the adsorbent 111. This allows the mounting member 340 to be held in place by the process of attaching the inner cover 22 to the base 21. This makes it easy to assemble the HDD 10. Furthermore, because the mounting member 340 is detachable from the support plate 310 and the case 91, it can be easily molded.

[0117] (Fourth embodiment) The fourth embodiment will be described below with reference to Figures 8 and 9. Figure 8 is an exemplary perspective view showing a portion of an HDD 10 according to the fourth embodiment. Figure 9 is an exemplary cross-sectional view schematically showing a portion of an HDD 10 of the fourth embodiment.

[0118] 8, the HSA 14 of the fourth embodiment has a support plate 410 instead of the support plate 48. The support plate 410 is substantially the same as the support plate 48, except for the points described below. The support plate 410 is an example of a first member. The support plate 410 has a pair of retaining walls 411 and a pair of retaining walls 412.

[0119] The retaining walls 411 and 412 protrude substantially in the +Z direction from the bottom plate 71. The pair of retaining walls 411 are spaced apart from each other in the X direction and are connected to the standing plate 72. Each of the pair of retaining walls 411 is provided with a slit 415 extending substantially in the Z direction.

[0120] The pair of retaining walls 412 are spaced apart from each other in the X direction and are spaced apart from the retaining wall 411 in approximately the -Y direction. A slit 416 extending approximately in the Z direction is provided in each of the pair of retaining walls 412. The slits 415 and 416 are open in the +Z direction.

[0121] The case 91 of the fourth embodiment has a mounting wall 420 instead of the mounting wall 96. The mounting wall 420 has a crossing portion 421 and a pressing portion 422. The crossing portion 421 extends from the storage portion 95 in approximately the -Y direction. The crossing portion 421 extends along the inner surface 22a of the inner cover 22 so as to cross the standing plate 72 of the support plate 410. The pressing portion 422 protrudes in approximately the -Z direction from the end of the crossing portion 421 in the -Y direction.

[0122] 9, the adsorption unit 19 of the fourth embodiment has a plurality of adsorbents 431 and a membrane 432 instead of the adsorbent 111 and the membrane 112. The plurality of adsorbents 431 is an example of an adsorbent and a plurality of adsorbents. The adsorbent 431 and the membrane 432 are substantially the same as the adsorbent 111 and the membrane 112, except as described below.

[0123] In this embodiment, the adsorption unit 19 has four adsorbents 431. The four adsorbents 431 are spaced apart from one another. Each of the four adsorbents 431 adsorbs an organic gas. Note that the four adsorbents 431 may adsorb different types of gases.

[0124] The membrane 432 has four plate portions 441, 442, 443, and 444 and four enclosure portions 445. The plate portion 441 is an example of a first mounting portion. The plate portion 442 is an example of a second mounting portion. In this embodiment, the plate portions 441 and 442 are provided at both ends of the suction unit 19. The plate portions 443 and 444 are located between the two plate portions 441 and 442. Note that the membrane 432 is not limited to this example.

[0125] 8, the plate portion 441 is fitted into the slits 415 of the pair of holding walls 411. For example, the plate portion 441 is inserted into the slit 415 from the end of the slit 415 that is open in the +Z direction. In this way, the plate portion 441 is attached to the pair of holding walls 411 of the support plate 410.

[0126] The plate portions 442 are fitted into the slits 416 of the pair of holding walls 412. For example, the plate portions 442 are inserted into the slits 416 from the ends of the slits 416 that are open in the +Z direction. In this way, the plate portions 442 are attached to the pair of holding walls 412 of the support plate 410.

[0127] One end of plate portion 443 is connected to the end of plate portion 441 in the +Z direction. One end of plate portion 444 is connected to the end of plate portion 442 in the +Z direction. The other end of plate portion 443 and the other end of plate portion 444 are connected to each other.

[0128] Each of the four plate portions 441, 442, 443, and 444 is provided with an enclosure 445. Each of the four enclosures 445 covers a corresponding adsorbent 431. As shown in Fig. 9, each of the enclosures 445 has a first surface 445a and a second surface 445b.

[0129] The first surface 445a and the second surface 445b are located opposite each other. At least one of the first surface 445a and the second surface 445b is exposed to the internal space S. The adsorbent 431 adsorbs organic gases through at least one of the exposed first surface 445a and the second surface 445b.

[0130] The enclosure 445 protrudes from the surface of at least one of the plate portions 441, 442, 443, and 444. The enclosure 445 provided on the plate portion 441 is located between the pair of holding walls 411 in the X direction. The enclosure 445 provided on the plate portion 442 is located between the pair of holding walls 412 in the X direction.

[0131] Pressing portion 422 of mounting wall 420 abuts against membrane 432 between plate portion 443 and plate portion 444. Therefore, case 91 is an example of the second member. Membrane 432 further has a curved portion 446. Bending portion 446 is located between plate portion 441 and plate portion 442, and is bent by being pressed by pressing portion 422 of case 91 between the two plate portions 443, 444.

[0132] The pressing portion 422 presses the curved portion 446, thereby generating tension in the film 432. As a result, the suction unit 19 is held between the support plate 410 and the case 91 so that each of the four plate portions 441, 442, 443, and 444 extends substantially straight.

[0133] In the HDD 10 of the fourth embodiment described above, the plurality of adsorbents 431 are configured to be spaced apart from one another and to adsorb organic gases. This allows the adsorption unit 19 to increase the surface area of the adsorbents 431. Furthermore, the adsorption unit 19 can arrange the plurality of adsorbents 431 at multiple positions where the adsorbents 431 are efficiently exposed to the airflow. Therefore, the adsorption unit 19 can cause the adsorbents 431 to adsorb a larger amount of organic gases.

[0134] The suction unit 19 is held between the support plate 410 and the case 91. As a result, the suction unit 19 is held in place by the process of attaching the inner cover 22 to the base 21. This makes it easier to assemble the HDD 10.

[0135] The suction unit 19 has a plate portion 441, a plate portion 442, and a curved portion 446. The plate portions 441 and 442 are attached to the support plate 410. The curved portion 446 is located between the plate portions 441 and 442, and is bent by being pressed by the case 91. That is, the case 91 can apply tension to the curved portion 446 by pressing the curved portion 446. Therefore, the process of attaching the inner cover 22 to the base 21 maintains the suction unit 19 in a desired shape.

[0136] (Fifth embodiment) The fifth embodiment will be described below with reference to Figures 10 and 11. Figure 10 is an exemplary perspective view showing a portion of an HDD 10 according to the fifth embodiment. Figure 11 is an exemplary cross-sectional view schematically showing a portion of an HDD 10 of the fifth embodiment.

[0137] As shown in FIG. 10 , the HSA 14 of the fifth embodiment has a support plate 510 instead of the support plate 48. The support plate 510 is substantially the same as the support plate 48, except for the points described below. The support plate 510 has three retaining walls 511. The retaining walls 511 are an example of a second retaining wall. Therefore, the support plate 510 is an example of a second member.

[0138] The three holding walls 511 protrude substantially in the +Z direction from the bottom plate 71. The three holding walls 511 are spaced apart in the Y direction. The holding walls 511 are also spaced apart from the standing plate 72 in the -Y direction.

[0139] Case 91 of the fifth embodiment has mounting wall 520 instead of mounting wall 96. Mounting wall 520 has crossing portion 521 and multiple pairs of retaining walls 522. Retaining wall 522 is an example of a first retaining wall. Therefore, case 91 is an example of a first member.

[0140] The traverse portion 521 extends from the storage portion 95 in approximately the -Y direction. The traverse portion 521 extends along the inner surface 22a of the inner cover 22 so as to traverse the standing plate 72 of the support plate 510. Multiple pairs of retaining walls 522 extend in approximately the -Z direction from the traverse portion 521. The multiple pairs of retaining walls 522 are arranged with intervals in the Y direction. Each of the three retaining walls 511 is located between two retaining walls 522 adjacent to each other in the Y direction.

[0141] The HDD 10 of the fifth embodiment has three adsorption units 19. As shown in FIG. 11 , each of the three adsorption units 19 has two adsorbents 531 and a membrane 532. The two adsorbents 531 are an example of an adsorbent and a plurality of adsorbents. The adsorbents 531 and the membrane 532 are substantially the same as the adsorbent 111 and the membrane 112, except for the points described below. The two adsorbents 531 are spaced apart from each other and adsorb organic gases.

[0142] The membrane 532 has two plate portions 541 and 542, a curved portion 543, and two enclosure portions 545. The plate portion 541 is an example of a first portion. The plate portion 542 is an example of a second portion. The curved portion 543 is an example of a third portion.

[0143] The plate portion 541 is held between one of the two holding walls 522 adjacent in the Y direction and the holding wall 511. The plate portion 542 is held between the other of the two holding walls 522 adjacent in the Y direction and the holding wall 511. This allows the suction unit 19 to be held between the support plate 510 and the case 91. The holding wall 511 is located between the two plate portions 541, 542. Furthermore, the two plate portions 541, 542 are located between the two holding walls 522 adjacent in the Y direction.

[0144] Bent portion 543 connects the end of plate portion 541 and the end of plate portion 542 in the +Z direction. That is, bent portion 543 is provided between two plate portions 541 and 542. Bent portion 543 is bent along the end of holding wall 511 in the +Z direction.

[0145] Each of the two plate portions 541, 542 is provided with an enclosure 545. Each of the two enclosures 545 covers a corresponding one of the adsorbents 531. The enclosures 545 protrude from one surface of each of the plate portions 541, 542. In the X direction, the enclosures 545 are located between the corresponding pair of retaining walls 522.

[0146] When the inner cover 22 is attached to the base 21, the pairs of retaining walls 522 move substantially in the Z direction substantially parallel to the three retaining walls 511. As a result, the retaining wall 511 is inserted into the gap between two retaining walls 522 adjacent to each other in the Y direction, and holds the plate portions 541, 542 of the suction unit 19 together with the two retaining walls 522.

[0147] In the HDD 10 of the fifth embodiment described above, the case 91 has two retaining walls 522. The support plate 510 has a retaining wall 511 located between the two retaining walls 522. The suction unit 19 has a plate portion 541, a plate portion 542, and a curved portion 543. The plate portion 541 is held between one of the two retaining walls 522 and the retaining wall 511. The plate portion 542 is held between the other of the two retaining walls 522 and the retaining wall 511. The curved portion 543 is provided between the plate portions 541 and 542. That is, the suction unit 19 is bent at the curved portion 543 so that the retaining wall 511 is disposed between the plate portions 541 and 542. When the inner cover 22 is attached to the base 21, the suction unit 19 and the retaining wall 511 are inserted between the two retaining walls 522. As a result, the suction unit 19 is held in place by the process of attaching the inner cover 22 to the base 21. This makes it easier to assemble the HDD 10.

[0148] (Sixth embodiment) The sixth embodiment will be described below with reference to Figures 12 and 13. Figure 12 is an exemplary perspective view showing a portion of an HDD 10 according to the sixth embodiment. Figure 13 is an exemplary cross-sectional view schematically showing a portion of an HDD 10 of the sixth embodiment.

[0149] 12, the sixth embodiment of the HSA 14 has a support plate 610 instead of the support plate 48. The support plate 610 is substantially the same as the support plate 48, except as described below. The support plate 610 has three pairs of retaining walls 611.

[0150] The three pairs of retaining walls 611 protrude from the bottom plate 71 in approximately the +Z direction. The three pairs of retaining walls 611 are spaced apart in the Y direction. The retaining walls 611 are also spaced apart from the standing plate 72 in the -Y direction. Each of the retaining walls 611 is provided with a slit 612 extending approximately in the Z direction. The slits 612 are open in the +Z direction.

[0151] The case 91 of the sixth embodiment has a mounting wall 620 instead of the mounting wall 96. The mounting wall 620 has a crossing portion 621 and a holding portion 622. The crossing portion 621 extends from the storage portion 95 in approximately the -Y direction. The crossing portion 621 extends along the inner surface 22a of the inner cover 22 so as to cross the standing plate 72 of the support plate 610. The holding portion 622 is connected to the end of the crossing portion 621 in the -Y direction.

[0152] 13, three slits 623 are provided in the holding portion 622. The three slits 623 are arranged at intervals in the Y direction. The slits 623 are open in the −Z direction.

[0153] The HDD 10 of the sixth embodiment has three adsorption units 19. Each of the three adsorption units 19 has an adsorbent 631 and a membrane 632. The adsorbent 631 of the three adsorption units 19 is an example of an adsorbent and a plurality of adsorbents. The adsorbent 631 and the membrane 632 are substantially the same as the adsorbent 111 and the membrane 112, except as described below.

[0154] The adsorbents 631 of the three adsorption units 19 are spaced apart from one another and adsorb organic gases. The membrane 632 encases the adsorbents 631 so that they form a substantially rectangular parallelepiped. That is, in the sixth embodiment, each of the three adsorption units 19 is formed in a substantially rectangular parallelepiped shape, and the membrane 632 does not have a plate portion. However, the membrane 632 is not limited to this example.

[0155] The ends of the suction unit 19 in the -Z direction are fitted into the slits 612 of the corresponding pair of holding walls 611. For example, the suction unit 19 is inserted into the slit 612 from the end of the slit 612 that is open in the +Z direction.

[0156] The end of the suction unit 19 in the +Z direction is fitted into the corresponding slit 623 of the holding portion 622. For example, the suction unit 19 is inserted into the slit 623 from the end of the slit 623 that is open in the -Z direction. As a result, the suction unit 19 is held between the support plate 610 and the case 91.

[0157] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0158] 10...Hard disk drive (HDD), 11...Housing, 12...Magnetic disk, 18...Moisture absorption unit, 19...Adsorption unit, 19a...Top surface, 21...Base, 22...Inner cover, 47...FPC, 48,310,410,510,610...Support plate, 71...Bottom plate, 72...Standing plate, 91...Case, 92...Moisture absorbent, 95...Containing section, 96,321,420,520,620...Mounting wall, 102a...Top surface, 102b...Bottom surface, 105...Through-hole, 111,431 ,531,631...adsorbent, 112,432,532,632...membrane, 115a...upper surface, 115b...lower surface, 116,211,445,545...enclosure portion, 116a,211a...upper surface, 116b,211b...lower surface, 331...elastic body, 340...mounting member, 441,442,541,542...plate portion, 446,543...curved portion, 511,522...retaining wall, S...internal space, S1...first space, S2...second space, P1...first passage, P2...second passage.

Claims

1. a housing including a base having an internal space and a cover attached to the base to close the internal space, the internal space being filled with a first gas; a holding member attached to the base in the internal space and configured to hold a flexible printed circuit board; a moisture absorbing unit including a moisture absorbent configured to absorb moisture and a case that accommodates the moisture absorbent and is attached to the cover in the internal space; an adsorption unit having an adsorbent configured to adsorb a second gas different from the first gas, the adsorption unit being held by at least one of the holding member and the case outside the case in the internal space and exposed to the internal space; A disk device comprising:

2. a magnetic disk disposed in the interior space and configured to rotate; Further comprising: the adsorption unit is spaced further from the magnetic disk than the moisture absorbent is, 2. The disk device according to claim 1.

3. the retaining member has a first wall attached to the base and a second wall extending from the first wall toward the cover; the suction unit is spaced further from the magnetic disk than the second wall; 3. The disk device according to claim 2.

4. the internal space includes a first space in which the magnetic disk is disposed, a second space in which the suction unit is disposed, a first passage that connects the first space with the second space, and a second passage that is spaced apart from the first passage and connects the first space with the second space.

3. The disk device according to claim 2.

5. the suction unit has a first surface exposed to the internal space and a second surface located on the opposite side of the first surface and exposed to the internal space, the adsorbent is configured to adsorb the second gas through the first surface and to adsorb the second gas through the second surface; 5. A disk device according to claim 1.

6. The adsorption unit has a breathable membrane that covers the adsorbent, the first surface and the second surface are provided on the membrane; 6. The disk device according to claim 5.

7. The suction unit is attached to the case.

7. The disk device according to claim 6.

8. the case has a housing portion that houses the moisture absorbent, and a mounting wall that extends from the housing portion and has a through-hole formed therein; the suction unit has a third surface located opposite to the first surface, and a protrusion protruding from the third surface, the first surface is attached to the mounting wall and is exposed to the internal space through the through hole; The second surface is provided on the protrusion.

8. The disk device according to claim 7.

9. the case has a housing portion that houses the moisture absorbent and a mounting wall that extends from the housing portion, the mounting wall has a fourth surface and a fifth surface opposite to the fourth surface, and is provided with through holes that open to the fourth surface and the fifth surface; the suction unit is fitted into the through-hole so as to protrude from the fourth surface and protrude from the fifth surface; 8. The disk device according to claim 7.

10. the adsorbent has a plurality of adsorbents spaced apart from one another and configured to adsorb the second gas; 5. A disk device according to claim 1.

11. an elastic body attached to one of the holding member and the case; Further comprising: the adsorption unit includes a member that is held between the other of the holding member and the case and the elastic body and that supports the adsorbent.

5. A disk device according to claim 1.

12. The suction unit is held between the holding member and the case.

5. A disk device according to claim 1.

13. The suction unit has a first mounting portion attached to one of the first members of the holding member and the case, a second mounting portion attached to the first member, and a curved portion located between the first mounting portion and the second mounting portion and bent by being pressed by the other second member of the holding member and the case.

13. The disk drive of claim 12.

14. a first member of either the holding member or the case has two first holding walls; the second member, which is the other of the holding member and the case, has a second holding wall located between the two first holding walls; The suction unit has a first portion held between one of the two first holding walls and the second holding wall, a second portion held between the other of the two first holding walls and the second holding wall, and a third portion provided between the first portion and the second portion.

13. The disk drive of claim 12.

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