Disk device

Abstract

To provide a disk device capable of improving the strength of coupling between an end surface of a base and an outer cover.SOLUTION: A disk device according to one embodiment includes a magnetic disc, a base, a film, an inner cover, and an outer cover. The base is provided with an inner space and has: a first inner surface that surrounds the magnetic disk; a support surface that is connected to an end of the first inner surface in a first direction; a second inner surface that is more separated from a rotation axis of the magnetic disk than the first inner surface and is also connected to the support surface; and an end surface that is connected to an end of the second inner surface in the first direction. The film covers a coating region included in the second inner surface and is separated from the end surface and an exposure region included in the second inner surface and aligned with the coating region around the rotation axis. The inner cover is supported on the support surface and is surrounded with the second inner surface. The outer cover is at least partially coupled to the base.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 a magnetic disk and a housing that houses the magnetic disk. The housing has, for example, a base, an inner cover that closes the interior space of the base, and an outer cover that covers the inner cover and is welded to the end face of the base. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Patent No. 1,091,0018 Summary of the Invention [Problem to be solved by the invention]

[0004] The surface of the base is generally protected by an electrodeposition coating. However, the base may have the coating removed near the outer cover by, for example, cutting to prevent the coating from melting during welding. If the width of the end face of the base is reduced by cutting, the strength of the weld between the end face and the outer cover may be reduced.

[0005] One example of a problem to be solved by the present invention is to provide a disk drive that can improve the strength of the connection between the end face of the base and the outer cover. [Means for solving the problem]

[0006] According to one embodiment, a disk drive includes a magnetic disk, a base, a film, an inner cover, and an outer cover. The magnetic disk is rotatable around a rotation axis. The base has an internal space in which the magnetic disk is disposed, a first inner surface surrounding the magnetic disk, a support surface connected to an end of the first inner surface in a first direction along the rotation axis, a second inner surface connected to the support surface and spaced apart from the end of the second inner surface in the first direction. The film covers at least a portion of the first inner surface, at least a portion of the support surface, and a covered region of the second inner surface, and is spaced apart from the end surface and an exposed region of the second inner surface aligned with the covered region around the rotation axis. The inner cover is supported on the support surface, surrounded by the second inner surface, and covers the internal space. The outer cover is coupled to at least a portion of the base and covers the inner cover. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is an exemplary perspective view showing an HDD according to an embodiment. [Figure 2] FIG. 2 is an exemplary plan view that schematically illustrates a portion of the HDD of the above embodiment. [Figure 3] FIG. 3 is an exemplary cross-sectional view showing a part of the HDD of the embodiment taken along line F3-F3 in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] An 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, "inhibit" is defined as, for example, preventing an event, action, or effect from occurring or reducing the magnitude of an event, action, or effect.

[0010] Fig. 1 is an exemplary perspective view showing a hard disk drive (HDD) 10 according to this embodiment. Fig. 2 is an exemplary plan view schematically showing a portion of the HDD 10 according to this embodiment. Fig. 3 is an exemplary cross-sectional view showing a portion of the HDD 10 according to this embodiment along line F3-F3 in Fig. 2.

[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, the HDD 10 includes a housing 11, multiple magnetic disks 12, a spindle motor 13, a head stack assembly (HSA) 14, and a voice coil motor (VCM) 15. The magnetic disks 12 may also be referred to as disks or platters.

[0014] As shown in Fig. 3, the housing 11 has a base 21, a paint film 22, an inner cover 23, a gasket 24, and an outer cover 25. Note that the housing 11 is not limited to this example. The paint film 22 is an example of a film. For convenience, Fig. 1 shows the housing 11 without the inner cover 23, the gasket 24, and the outer cover 25. For convenience, Fig. 2 shows the outer cover 25 imaginarily with a two-dot chain line.

[0015] The base 21, the inner cover 23, and the outer cover 25 are each made of a metal material such as an aluminum alloy, but the materials of the base 21, the inner cover 23, and the outer cover 25 may be different from each other.

[0016] The base 21 is formed in a substantially rectangular box shape that is open in the +Z direction. That is, an internal space Si is provided in the base 21. The internal space Si communicates with the outside of the base 21 through an end of the base 21 in the +Z direction. The multiple magnetic disks 12, the spindle motor 13, the HSA 14, and the VCM 15 are disposed in the internal space Si.

[0017] 1, the base 21 extends in the Y direction (+Y direction and −Y direction). Therefore, the Y direction is the longitudinal direction of the base 21 and the housing 11. Furthermore, the X direction is the lateral direction of the base 21 and the housing 11.

[0018] The base 21 has a bottom wall 31 and side walls 32. The bottom wall 31 is formed in a substantially rectangular (quadrilateral) plate shape arranged substantially perpendicular to the Z direction. The side walls 32 protrude from the edges of the bottom wall 31 substantially in the +Z direction and are formed in a substantially rectangular frame shape.

[0019] The paint film 22 is made of, for example, epoxy resin. However, the paint film 22 is not limited to this example. The paint film 22 is provided on the surface of the base 21 by, for example, electrodeposition coating. The paint film 22 has higher corrosion resistance and rust prevention properties than the base 21, and protects the base 21.

[0020] As shown in FIG. 2, the inner cover 23 is attached to the side wall 32 by a fastening member 35 such as a screw. As a result, the inner cover 23 covers the internal space Si of the base 21. As shown in FIG. 3, the gasket 24 is interposed between the side wall 32 and the inner cover 23 to seal the gap between the side wall 32 and the inner cover 23. The outer cover 25 covers the inner cover 23 and is attached to the side wall 32 by, for example, welding. Note that the outer cover 25 may be attached to another portion of the base 21. That is, the outer cover 25 is attached to at least a portion of the base 21.

[0021] For example, vent holes are provided in the inner cover 23 and the outer cover 25. After the magnetic disk 12, spindle motor 13, HSA 14, and VCM 15 are arranged in the internal space Si and the inner cover 23 and outer cover 25 are attached to the base 21, the air inside the housing 11 is evacuated through the vent holes. Furthermore, the internal space Si is filled with a gas other than air. The vent holes in the outer cover 25 are hermetically sealed, for example, by a seal.

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

[0023] The magnetic disks 12 are arranged in the Z direction with gaps between them. The magnetic disks 12 are formed into disk shapes and arranged approximately perpendicular to the Z direction. The diameter of each of the magnetic disks 12 is, for example, 96 mm or more. However, the diameter of the magnetic disks 12 is not limited to this example.

[0024] Each of the multiple magnetic disks 12 has two flat surfaces 12a and 12b and an outer circumferential surface 12c. One flat surface 12a faces approximately in the +Z direction. The other flat surface 12b is located opposite to flat surface 12a and faces approximately in the -Z direction. The outer circumferential surface 12c is a substantially cylindrical curved surface that extends approximately in the Z direction between the outer edges of flat surfaces 12a and 12b. Magnetic recording layers are provided on flat surfaces 12a and 12b.

[0025] 1 supports a plurality of magnetic disks 12. The plurality of magnetic disks 12 are held on a hub of the spindle motor 13 by, for example, clamp springs. The spindle motor 13 rotates the plurality of magnetic disks 12 together around a central axis Axd. The central axis Axd is an example of a rotation axis.

[0026] The central axis Axd is an imaginary axis that extends substantially in the Z direction. The central axis Axd is, for example, the central axis of the magnetic disk 12 and the spindle motor 13. However, the central axis Axd is not limited to this example.

[0027] The HSA 14 has a carriage 41 and multiple head gimbal assemblies (HGA) 42. Note that the HSA 14 is not limited to this example. The carriage 41 is attached to the base 21 so as to be rotatable around a central axis Axc. The central axis Axc is an imaginary axis extending substantially in the Z direction. In other words, the central axis Axc of the carriage 41 and the central axis Axd of the magnetic disk 12 extend substantially parallel to each other. The central axis Axc is spaced apart from the central axis Axd.

[0028] The multiple HGAs 42 are attached to arms of the carriage 41 and rotate integrally with the carriage 41 around the central axis Axc. The multiple HGAs 42 are arranged in the Z direction with gaps between them. Each of the multiple HGAs 42 has a magnetic head 45. The magnetic head 45 may also be referred to as a slider.

[0029] The magnetic head 45 records and reproduces information on a corresponding one of the multiple magnetic disks 12. In other words, the magnetic head 45 reads and writes information from and to the magnetic disk 12. The carriage 41 rotates around the central axis Axc to move the magnetic head 45 relative to the corresponding magnetic disk 12.

[0030] The VCM 15 rotates the carriage 41 around the central axis Axc to move the magnetic head 45 to a desired position along the magnetic disk 12. The VCM 15 has a voice coil, a pair of yokes, and a magnet attached to the yokes. The voice coil is held by the carriage 41.

[0031] 3, the side wall 32 has a first inner surface 51, a second inner surface 52, a support surface 53, an end surface 54, an inclined surface 55, a first outer surface 56, and a second outer surface 57. The second outer surface 57 is an example of an outer surface. However, the side wall 32 is not limited to this example.

[0032] The first inner surface 51, the second inner surface 52, the support surface 53, the end surface 54, the inclined surface 55, the first outer surface 56, and the second outer surface 57 are each formed in a frame shape surrounding the central axes Axc and Axd. The first inner surface 51 and the second inner surface 52 face in a direction substantially perpendicular to the central axis Axd. Note that at least a portion of the first inner surface 51 and the second inner surface 52 may face in another direction.

[0033] The first inner surface 51 extends substantially in the +Z direction from the bottom wall 31. The first inner surface 51 surrounds the multiple magnetic disks 12, at least a portion of the spindle motor 13, at least a portion of the HSA 14, and at least a portion of the VCM 15. That is, in the Z direction, the multiple magnetic disks 12 are disposed between an end of the first inner surface 51 in the +Z direction and an end of the first inner surface 51 in the -Z direction. Note that a portion of the magnetic disk 12 may protrude in the +Z direction beyond the end of the first inner surface 51 in the +Z direction.

[0034] The first inner surface 51 has a curved surface 51a. The curved surface 51a is a substantially cylindrical curved surface that extends along the outer peripheral surface 12c of the magnetic disk 12. In other words, the curved surface 51a of the first inner surface 51 and the outer peripheral surface 12c of the magnetic disk 12 are arranged concentrically (coaxially).

[0035] The curved surface 51a functions as a so-called shroud, and therefore, the curved surface 51a regulates the flow of helium in the internal space Si in the vicinity of the magnetic disk 12, thereby suppressing the generation of turbulent helium flow.

[0036] The second inner surface 52 is farther away from the bottom wall 31 than the first inner surface 51. Furthermore, the second inner surface 52 is farther away from the central axes Axc and Axd than the first inner surface 51. Therefore, on a projection plane viewed in the Z direction (+Z direction or −Z direction) as shown in FIG. 2, the second inner surface 52 surrounds the first inner surface 51. The +Z direction is a direction along the central axis Axd and is an example of a first direction.

[0037] 3, the support surface 53 and the end surface 54 face substantially in the +Z direction. Note that the support surface 53 and the end surface 54 may have irregularities. That is, at least a portion of the support surface 53 and the end surface 54 may face in another direction.

[0038] The support surface 53 is connected to an end of the first inner surface 51 in the +Z direction and an end of the second inner surface 52 in the -Z direction. In other words, the support surface 53 is provided between the first inner surface 51 and the second inner surface 52. The support surface 53 supports the inner cover 23 via the gasket 24. That is, the gasket 24 is interposed between the support surface 53 and the inner cover 23.

[0039] The second inner surface 52 surrounds the inner cover 23 and the gasket 24 supported by the support surface 53. That is, the inner cover 23 and the gasket 24 are disposed between an end of the second inner surface 52 in the +Z direction and an end of the second inner surface 52 in the -Z direction. Note that a portion of the inner cover 23 may protrude in the +Z direction beyond the end of the second inner surface 52 in the +Z direction, and a portion of the gasket 24 may protrude in the -Z direction beyond the end of the second inner surface 52 in the -Z direction.

[0040] The first inner surface 51 is provided in the internal space Si. In other words, the bottom wall 31 and the first inner surface 51 form (define, partition) the internal space Si. The second inner surface 52 is provided in the intermediate space Sm between the inner cover 23 and the outer cover 25. The support surface 53 may be partially provided in the internal space Si, or may be partially provided in the intermediate space Sm.

[0041] The end surface 54 is connected to the end of the second inner surface 52 in the +Z direction. The end surface 54 is provided at the end of the side wall 32 in the +Z direction. Note that the side wall 32 may have another portion located at the end of the side wall 32 in the +Z direction.

[0042] The outer cover 25 is joined to the end surface 54 by, for example, welding. For this purpose, a bead 58 is provided on the end surface 54. The bead 58 extends along the end surface 54. However, the outer cover 25 may be joined to the end surface 54 by other methods.

[0043] The inclined surface 55 is provided between the second inner surface 52 and the end surface 54. That is, the end surface 54 is connected to the end of the second inner surface 52 in the +Z direction via the inclined surface 55. Note that the end surface 54 may be directly connected to the second inner surface 52.

[0044] The inclined surface 55 extends between the second inner surface 52 and the end surface 54, at an angle to the second inner surface 52 and the end surface 54. The inclined surface 55 is formed by, for example, chamfering. However, the inclined surface 55 is not limited to this example.

[0045] The first outer surface 56 is located opposite the first inner surface 51 and the second inner surface 52. The second outer surface 57 is located opposite the second inner surface 52. An end of the second outer surface 57 in the +Z direction is connected to the end surface 54. An end of the second outer surface 57 in the -Z direction is connected to the first outer surface 56.

[0046] The side wall 32 has a wall 61 and a rib 62. The wall 61 has a first inner surface 51, a support surface 53, and a portion of a first outer surface 56. That is, the wall 61 protrudes from the edge of the bottom wall 31 in approximately the +Z direction. The support surface 53 is an end surface of the wall 61 in the +Z direction. The rib 62 has a second inner surface 52, an end surface 54, a portion of the first outer surface 56, and a second outer surface 57. The rib 62 protrudes from the support surface 53 of the wall 61 in approximately the +Z direction. The outer cover 25 is welded to the rib 62.

[0047] As shown in Fig. 2, the second inner surface 52 has a covered region 71 and an exposed region 72. As shown in Fig. 3, the second inner surface 52 further has a lower region 73. Note that the second inner surface 52 is not limited to this example.

[0048] 2, the covered region 71 and the exposed region 72 are adjacent to each other around the central axis Axd. In other words, the covered region 71 and the exposed region 72 are aligned around the central axis Axd. The covered region 71 and the exposed region 72 are at least partially disposed at approximately the same position (height) in the Z direction.

[0049] In this embodiment, the covered region 71 has three covered regions 71A, 71B, and 71C. Note that the covered region 71 is not limited to this example. The three covered regions 71A, 71B, and 71C are spaced apart from one another around the central axis Axd.

[0050] In this embodiment, the exposed region 72 has three exposed regions 72A, 72B, and 72C. However, the exposed region 72 is not limited to this example. The three exposed regions 72A, 72B, and 72C are spaced apart from one another around the central axis Axd. The exposed region 72A is an example of a first exposed region. The exposed region 72B is an example of a second exposed region. The exposed region 72C is an example of a third exposed region.

[0051] The three covered regions 71A, 71B, and 71C and the three exposed regions 72A, 72B, and 72C are alternately arranged around the central axis Axd. The exposed region 72A is located between the two covered regions 71A and 71C. The exposed region 72B is located between the two covered regions 71A and 71B. The exposed region 72C is located between the two covered regions 71B and 71C.

[0052] 2, the exposed area 72A faces the edge (vertex) P1 of the magnetic disk 12 in the +Y direction. The +Y direction is perpendicular to the central axis Axd and is an example of the second direction.

[0053] The central axis Axd of the magnetic disk 12 is spaced in the +Y direction from the center of the base 21 in the Y direction (longitudinal direction). That is, the magnetic disk 12 is spaced from the end of the base 21 in the -Y direction and close to the end of the base 21 in the +Y direction. On the other hand, the central axis Axc of the carriage 41 is spaced from the end of the base 21 in the +Y direction and close to the end of the base 21 in the -Y direction.

[0054] On a projection surface seen in the Z direction, the exposed area 72B faces the edge P2 of the magnetic disk 12 in the +X direction. The +X direction is a direction perpendicular to the +Z direction and the +Y direction, and is an example of a third direction.

[0055] On a projection plane viewed in the Z direction, the exposed area 72C faces the edge P3 of the magnetic disk 12 in the -X direction. The -X direction is the opposite direction to the +X direction and is an example of a fourth direction. The two exposed areas 72B and 72C face each other.

[0056] The exposed region 72 is closer to the magnetic disk 12 than the covered region 71. For example, the exposed region 72A is the portion of the second inner surface 52 that is closest to the edge P1 of the magnetic disk 12. The exposed region 72B is the portion of the second inner surface 52 that is closest to the edge P2 of the magnetic disk 12. The exposed region 72C is the portion of the second inner surface 52 that is closest to the edge P3 of the magnetic disk 12.

[0057] The distance between the exposed area 72A and the magnetic disk 12 is approximately equal to the distance between the exposed area 72B and the magnetic disk 12, and the distance between the exposed area 72C and the magnetic disk 12. However, these distances may be different from one another.

[0058] 3, the lower region 73 is provided between the covered region 71 and the support surface 53, and also between the exposed region 72 and the support surface 53. Therefore, the covered region 71 and the exposed region 72 are spaced apart from the support surface 53 in approximately the +Z direction. The lower region 73 is provided over the entire circumference around the central axis Axd. However, the lower region 73 is not limited to this example.

[0059] The paint film 22 covers at least a portion of the first inner surface 51, at least a portion of the support surface 53, the first outer surface 56, the covered region 71 (covered regions 71A, 71B, 71C), and at least a portion of the lower region 73. In other words, the paint film 22 adheres to the first inner surface 51, the support surface 53, the first outer surface 56, the covered region 71, and the lower region 73.

[0060] The paint film 22 does not cover the end face 54, the second outer surface 57, and the exposed region 72 (exposed regions 72A, 72B, 72C), leaving them exposed. In other words, the paint film 22 is spaced apart from the end face 54, the second outer surface 57, and the exposed region 72. Note that the end face 54, the second outer surface 57, and the exposed region 72 may be covered by another component such as the outer cover 25.

[0061] For example, the paint film 22 provided on the second inner surface 52 is removed by cutting, thereby forming an exposed region 72 on the second inner surface 52. By cutting a part of the second inner surface 52, the exposed region 72 is formed, recessed from the other parts, that is, the covered region 71 and the lower region 73. Therefore, the exposed region 72 forms a recess 75 that opens to the end surface 54, the covered region 71, and the lower region 73. Note that the covered region 71, the exposed region 72, and the lower region 73 may form the same plane.

[0062] 2, the width of the portion of the rib 62 where the exposed region 72 is provided is thinner than the width of the portion of the rib 62 where the covered region 71 is provided. That is, the distance D1 between the exposed region 72 and the second outer surface 57 is shorter than the distance D2 between the covered region 71 and the second outer surface 57. Note that the distances D1 and D2 are not limited to this example.

[0063] 3, the length of the slope 55 between the exposed region 72 and the end face 54 is shorter than the length of the slope 55 between the covered region 71 and the end face 54. Note that the length of the slope 55 is not limited to this example.

[0064] In the Z direction, the inner cover 23 is disposed between the end of the exposed region 72 in the +Z direction and the end of the exposed region 72 in the -Z direction. Therefore, the covered region 71 and the exposed region 72 face the inner cover 23. Also, the inner cover 23 is farther away from the support surface 53 than the end of the exposed region 72 in the -Z direction. The -Z direction is the opposite direction to the +Z direction and is an example of a fifth direction.

[0065] The lower region 73 faces the gasket 24. In the Z direction, the lower region 73 is spaced apart from the inner cover 23 in the −Z direction. Therefore, the lower region 73 does not face the inner cover 23. Note that the lower region 73 is not limited to this example.

[0066] The inner cover 23 has an inner surface 81 and an outer surface 82. As shown in Fig. 2, the inner cover 23 further has a side surface 83 and a protrusion 84. However, the inner cover 23 is not limited to this example. The protrusion 84 may be omitted from the inner cover 23.

[0067] 3, the inner surface 81 faces the bottom wall 31 and the support surface 53. The gasket 24 is interposed between the support surface 53 and the inner surface 81. The inner surface 81 faces the internal space Si. The outer surface 82 is located opposite the inner surface 81. The outer surface 82 faces the outer cover 25.

[0068] The side surface 83 extends substantially in the Z direction between the outer edge of the inner surface 81 and the outer edge of the outer surface 82. As shown in FIG. 2 , the side surface 83 faces in a direction substantially perpendicular to the central axis Axd. The side surface 83 faces the second inner surface 52. In this embodiment, the side surface 83 faces the paint film 22 on the coating region 71.

[0069] The protrusion 84 protrudes from the side surface 83 toward the exposed region 72. In this embodiment, the protrusion 84 has three protrusions 84A, 84B, and 84C. However, the protrusion 84 is not limited to this example. The three protrusions 84A, 84B, and 84C are spaced apart from one another around the central axis Axd.

[0070] The protrusion 84A protrudes from the side surface 83 toward the exposed region 72A. The protrusion 84B protrudes from the side surface 83 toward the exposed region 72B. The protrusion 84C protrudes from the side surface 83 toward the exposed region 72C.

[0071] Each of the protrusions 84A, 84B, and 84C has a side surface 85. The side surface 85 faces the exposed region 72. The side surface 85 of the protrusion 84A extends approximately parallel to the exposed region 72A. The side surface 85 of the protrusion 84B extends approximately parallel to the exposed region 72B. The side surface 85 of the protrusion 84C extends approximately parallel to the exposed region 72C.

[0072] Distance D3 between inner cover 23 and exposed region 72 is shorter than distance D4 between inner cover 23 and paint film 22. Distance D3 is at least one of the distance between side surface 85 of protrusion 84A and exposed region 72A, the distance between side surface 85 of protrusion 84B and exposed region 72B, and the distance between side surface 85 of protrusion 84C and exposed region 72C. Distance D4 is the distance between side surface 83 of inner cover 23 and paint film 22 on covered region 71.

[0073] Length L1 of protrusion 84 around central axis Axd is shorter than length L2 of exposed region 72. Length L1 is at least one of the length of protrusion 84A in the X direction, the length of protrusion 84B in the Y direction, and the length of protrusion 84C in the Y direction. Length L2 is at least one of the length of exposed region 72A in the X direction, the length of exposed region 72B in the Y direction, and the length of exposed region 72C in the Y direction.

[0074] The protrusion 84 is located outside the recess 75 and is spaced apart from the paint film 22 and the exposed region 72. Note that the protrusion 84 may be partially housed in the recess 75, or may be partially in contact with the paint film 22 and the exposed region 72.

[0075] The gasket 24 is made of, for example, synthetic rubber with low helium permeability. The gasket 24 is formed in a frame shape (endless) surrounding the central axes Axc and Axd. The gasket 24 has a thick portion 91 and a narrow portion 92. The thick portion 91 is an example of a first portion. The narrow portion 92 is an example of a second portion.

[0076] 2, the thick portion 91 is located between the magnetic disk 12 and the paint film 22. The thick portion 91 extends roughly along the side surface 83 of the inner cover 23. However, a portion of the thick portion 91 may be bent so as to bypass the fastening member 35 inward, for example.

[0077] In this embodiment, the thick portion 91 has three thick portions 91A, 91B, and 91C. In the projection plane as shown in FIG. 2, the thick portion 91A is located between the magnetic disk 12 and the paint film 22 on the coated area 71A. The thick portion 91B is located between the magnetic disk 12 and the paint film 22 on the coated area 71B. The thick portion 91C is located between the magnetic disk 12 and the paint film 22 on the coated area 71C. Note that the thick portion 91 is not limited to this example.

[0078] 2, the detailed portion 92 is located between the magnetic disk 12 and the exposed region 72. The detailed portion 92 is bent so as to protrude from the thick portion 91 toward the exposed region 72. The detailed portion 92 extends along the side surface 85 of the protruding portion 84.

[0079] In this embodiment, the detail 92 has three details 92A, 92B, and 92C. The three thick portions 91A, 91B, and 91C and the three details 92A, 92B, and 92C are alternately arranged around the central axis Axd. The detail 92A is located between the two thick portions 91A and 91C. The detail 92B is located between the two thick portions 91A and 91B. The detail 92C is located between the two thick portions 91B and 91C.

[0080] In the projection plane shown in FIG. 2, the detail 92A is located between the magnetic disk 12 and the exposed region 72A and is bent so as to protrude from the thick portions 91A and 91C toward the exposed region 72A. In the projection plane, the detail 92B is located between the magnetic disk 12 and the exposed region 72B and is bent so as to protrude from the thick portions 91A and 91B toward the exposed region 72B. In the projection plane, the detail 92C is located between the magnetic disk 12 and the exposed region 72C and is bent so as to protrude from the thick portions 91B and 91C toward the exposed region 72C. Note that the detail 92 is not limited to this example.

[0081] 2, the width W1 of the gasket 24 between the magnetic disk 12 and the exposed region 72 is narrower than the width W2 of the gasket 24 between the magnetic disk 12 and the paint film 22. In other words, the width W1 of the narrow portion 92 is narrower than the width W2 of the thick portion 91. Note that the width of the gasket 24 is not limited to this example.

[0082] For example, SFF-8300, a form factor for 3.5-inch hard disk drives established by the Form Factor Committee, sets maximum dimensions for HDDs. That is, the dimensions of the HDD 10 are restricted in the X, Y, and Z directions. On the other hand, if the diameter of the magnetic disk 12 is increased, the storage capacity of the HDD 10 can be increased.

[0083] When the diameter of the magnetic disk 12 is increased within the dimensional limitations of the HDD 10, the side wall 32 becomes thinner near the ends P1, P2, and P3 of the magnetic disk 12. In general, when the width of the end face 54 decreases as the side wall 32 becomes thinner, the strength of the weld between the end face 54 and the outer cover 25 may decrease.

[0084] The side wall 32 is protected by the paint film 22. The thickness precision of the electrodeposition coating that forms the paint film 22 is lower than that of, for example, cutting work. The inner cover 23 is spaced apart from the paint film 22 on the covered area 71 to prevent interference between the inner cover 23 and the paint film 22.

[0085] In this embodiment, the exposed area 72 is located near the edges P1, P2, and P3 of the magnetic disk 12. The exposed area 72 is formed by, for example, cutting, and therefore has relatively high dimensional accuracy. Therefore, the distance between the protrusion 84 of the inner cover 23 and the exposed area 72 can be set short.

[0086] As described above, the exposed region 72 can be close to the inner cover 23. Therefore, the end surface 54 connected to the exposed region 72 can also be close to the inner cover 23. In other words, in the vicinity of the ends P1, P2, and P3 of the magnetic disk 12, the end surface 54 can expand toward the inner cover 23.

[0087] On the other hand, the coated region 71 is covered with the paint film 22 but is spaced apart from the magnetic disk 12. Therefore, even when the coated region 71 is brought close to the magnetic disk 12, the support surface 53 can be provided with a width that is capable of supporting the inner cover 23 and the gasket 24. That is, even at a position spaced apart from the ends P1, P2, and P3 of the magnetic disk 12, the end face 54 can expand toward the inner cover 23. Therefore, the end face 54 can obtain a width that stabilizes the strength of the weld.

[0088] The inner cover 23 covers the magnetic disk 12 disposed in the internal space Si. Therefore, the size of the inner cover 23 and the size of the magnetic disk 12 can be correlated. As described above, the inner cover 23 can be close to the exposed region 72. Therefore, the inner cover 23 and the magnetic disk 12 can expand toward the exposed region 72, and the storage capacity of the magnetic disk 12 can be increased.

[0089] The exposed region 72 may be formed by other methods than cutting. For example, when the paint film 22 is provided on the second inner surface 52 by electrodeposition coating, a mask may cover the exposed region 72. The exposed region 72 is exposed by removing the mask.

[0090] In the HDD 10 according to the present embodiment described above, the magnetic disk 12 is rotatable around the central axis Axd. The base 21 has an internal space Si in which the magnetic disk 12 is disposed. The base 21 has a first inner surface 51, a support surface 53, a second inner surface 52, and an end surface 54. The first inner surface 51 surrounds the magnetic disk 12. The support surface 53 is connected to an end of the first inner surface 51 in the +Z direction along the central axis Axd. The second inner surface 52 is located farther from the central axis Axd than the first inner surface 51 and is connected to the support surface 53. The end surface 54 is connected to an end of the second inner surface 52 in the +Z direction. The paint film 22 covers at least a portion of the first inner surface 51, at least a portion of the support surface 53, and a covered region 71 of the second inner surface 52. The paint film 22 is spaced from the end surface 54 and the exposed region 72 of the second inner surface 52. The exposed region 72 is aligned with the covered region 71 around the central axis Axd. The inner cover 23 is supported on the support surface 53, surrounded by the second inner surface 52, and covers the internal space Si. The outer cover 25 is coupled to at least a portion of the base 21 and covers the inner cover 23.

[0091] The paint film 22 protects a portion of the second inner surface 52, but its thickness may vary. Meanwhile, the exposed region 72 of the second inner surface 52 is exposed and not covered by the paint film 22. The exposed region 72 can be formed, for example, by removing the paint film 22 through cutting. Therefore, the distance between the exposed region 72 and the inner cover 23 can be set more accurately and shorter than the distance between the paint film 22 and the inner cover 23. Therefore, the HDD 10 allows the inner cover 23 to expand closer to the exposed region 72. Meanwhile, the exposed region 72 can be positioned closer to the inner cover 23. Therefore, the HDD 10 allows the end surface 54 connected to the exposed region 72 and the covered region 71 to expand toward the inner cover 23. The outer cover 25 is generally coupled to the base 21 at or near the end surface 54. Therefore, expanding the end surface 54 can improve the strength of the bond between the base 21 and the outer cover 25. Furthermore, by widening the width of the end face 54, the HDD 10 can prevent the paint film 22 covering the second inner surface 52 from melting during welding. Furthermore, in the covered region 71, the paint film 22 covers the second inner surface 52. Therefore, compared to when the paint film 22 is removed from the entire circumference around the central axis Axd, the HDD 10 can reduce the work required to provide the exposed region 72 and prevent a reduction in the area of ​​the covered region 71 protected by the paint film 22.

[0092] The exposed area 72 is closer to the magnetic disk 12 than the covered area 71. As described above, the inner cover 23 can expand to approach the exposed area 72. Therefore, the HDD 10 can increase the diameter and storage capacity of the magnetic disk 12 covered by the inner cover 23. In addition, the covered area 71 is spaced apart from the magnetic disk 12, and its position can be flexibly set.

[0093] The exposed region 72 has exposed regions 72A, 72B, and 72C spaced apart from one another around the central axis Axd. The base 21 extends in the +Y direction, which is perpendicular to the central axis Axd. In a projection plane viewed in the +Z direction, the exposed region 72A faces an edge P1 of the magnetic disk 12 in the +Y direction. The exposed region 72B faces an edge P2 of the magnetic disk 12 in the +X direction, which is perpendicular to the +Z and +Y directions. The exposed region 72C faces an edge P3 of the magnetic disk 12 in the -X direction, which is opposite to the +X direction.

[0094] Generally, the end P1 of the magnetic disk 12 in the +Y direction, the end P2 of the magnetic disk 12 in the +X direction, and the end P3 of the magnetic disk 12 in the −X direction are closer to the second inner surface 52 than other portions of the magnetic disk 12. Therefore, the width of the support surface 53 is narrower near the ends P1, P2, and P3 of the magnetic disk 12 in the +Y direction, +X direction, and −X direction, respectively, but exposed regions 72A, 72B, and 72C are provided. The distance between each of the exposed regions 72A, 72B, and 72C and the inner cover 23 can be set short. Therefore, as described above, the HDD 10 can increase the diameter of the magnetic disk 12 and improve the bonding strength between the end face 54 and the outer cover 25. Furthermore, the HDD 10 can reduce the work required to provide the exposed regions 72 and prevent a reduction in the area of ​​the covered region 71 protected by the paint film 22.

[0095] The base 21 further has a second outer surface 57 opposite the second inner surface 52. A distance D1 between the exposed region 72 and the second outer surface 57 is shorter than a distance D2 between the covered region 71 and the second outer surface 57.

[0096] For example, by cutting away the paint film 22 and the covered region 71, an exposed region 72 that is not covered by the paint film 22 can be formed. By forming the exposed region 72, the diameter of the magnetic disk 12 in the HDD 10 can be increased, as described above, and the strength of the bond between the end face 54 and the outer cover 25 can be improved. Furthermore, the width of the end face 54 can be set wider between the covered region 71 and the second outer surface 57. Therefore, the strength of the bond between the end face 54 and the outer cover 25 in the HDD 10 can be improved.

[0097] The distance D3 between the inner cover 23 and the exposed region 72 is shorter than the distance D4 between the inner cover 23 and the paint film 22. This allows the HDD 10 to accommodate an increased diameter of the magnetic disk 12, as described above, and improves the strength of the bond between the end face 54 and the outer cover 25.

[0098] The inner cover 23 has a side surface 83 facing the paint film 22 and a protrusion 84 protruding from the side surface 83 toward the exposed area 72. This allows the HDD 10 to set a short distance between the inner cover 23 and the exposed area 72, and also prevents the side surface 83 and the paint film 22 from interfering with each other.

[0099] The length L1 of the protrusion 84 around the central axis Axd is shorter than the length L2 of the exposed region 72. This makes it possible to prevent the protrusion 84 from interfering with the paint film 22 in the vicinity of the exposed region 72.

[0100] The gasket 24 is interposed between the support surface 53 and the inner cover 23. The gasket 24 has a thick portion 91 and a detailed portion 92. The thick portion 91 is located between the magnetic disk 12 and the paint film 22 in a projection plane viewed in the +Z direction. The detailed portion 92 is located between the magnetic disk 12 and each of the exposed regions 72 in a projection plane viewed in the +Z direction, and is bent so as to protrude from the thick portion 91 toward the exposed region 72.

[0101] The detailed portion 92 is bent at a position corresponding to the exposed region 72 and the protruding portion 84 so as to move away from the edge of the support surface 53 connected to the first inner surface 51. This makes it possible for the gasket 24 to prevent the detailed portion 92 from falling off the support surface 53, and ultimately to more reliably seal the internal space Si.

[0102] The gasket 24 is interposed between the support surface 53 and the inner cover 23. In a projection plane viewed in the +Z direction, the width W1 of the gasket 24 between the magnetic disk 12 and the exposed region 72 is narrower than the width W2 of the gasket 24 between the magnetic disk 12 and the paint film 22.

[0103] Because the exposed region 72 is closer to the magnetic disk 12 than the covered region 71, the width of the support surface 53 is narrow near the exposed region 72. Because the width W1 of the gasket 24 is narrow near the exposed region 72, the gasket 24 can be prevented from falling off the support surface 53, and therefore the internal space Si can be sealed more reliably.

[0104] The outer cover 25 is coupled to the end surface 54. As described above, the HDD 10 can have the end surface 54 widen toward the inner cover 23, thereby improving the strength of the coupling between the end surface 54 and the outer cover 25.

[0105] The base 21 further has a slope 55. The slope 55 extends between the second inner surface 52 and the end surface 54, at an angle relative to the second inner surface 52 and the end surface 54. The length of the slope 55 between the exposed region 72 and the end surface 54 is shorter than the length of the slope 55 between the covered region 71 and the end surface 54.

[0106] By setting the slope 55 to be short, it is possible to prevent the width of the end face 54 from decreasing near the exposed area 72. Therefore, in the HDD 10, the strength of the bond between the end face 54 and the outer cover 25 can be improved.

[0107] The diameter of the magnetic disk 12 is 96 mm or more. Generally, when the diameter of the magnetic disk 12 is set larger, the distance between the second inner surface 52 and the magnetic disk 12 becomes smaller. However, as described above, the HDD 10 allows the diameter of the magnetic disk 12 to be increased, and the strength of the bond between the end face 54 and the outer cover 25 can be improved.

[0108] The exposed area 72 is spaced apart from the support surface 53 and faces the inner cover 23. This prevents the paint film 22 covering the support surface 53 from being removed during the cutting process to form the exposed area 72 of the HDD 10, and prevents a reduction in the area of ​​the support surface 53 protected by the paint film 22.

[0109] The inner cover 23 is farther from the support surface 53 than the end of the exposed area 72 in the −Z direction opposite to the +Z direction. This makes it possible for the HDD 10 to prevent the paint film 22 provided between the support surface 53 and the exposed area 72 and the inner cover 23 from interfering with each other.

[0110] 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]

[0111] 10...Hard disk drive (HDD), 12...Magnetic disk, 21...Base, 22...Paint film, 23...Inner cover, 24...Gasket, 25...Outer cover, 51...First inner surface, 52...Second inner surface, 53...Support surface, 54...End surface, 55...Sloped surface, 56...First outer surface, 57...Second outer surface, 71, 71A, 71B, 71C...Covered area, 72, 72A, 72B, 72C...Exposed area, 83...Side, 84, 84A, 84B, 84C...Convex portion, 91, 91A, 91B, 91C...Thick portion, 92, 92A, 92B, 92C...Details, Si...Internal space, Axd...Central axis, P1, P2, P3...End, D1, D2, D3, D4...Distance, L1, L2...Length, W1, W2...Width.

Claims

1. a magnetic disk rotatable around a rotation axis; a base having an internal space in which the magnetic disk is disposed, the base having a first inner surface surrounding the magnetic disk, a support surface connected to an end of the first inner surface in a first direction along the rotation axis, a second inner surface connected to the support surface and spaced apart from the rotation axis more than the first inner surface, and an end surface connected to the end of the second inner surface in the first direction; a membrane covering at least a portion of the first inner surface, at least a portion of the support surface, and a covered region of the second inner surface, and spaced apart from the end surface and an exposed region of the second inner surface aligned with the covered region around the rotation axis; an inner cover supported by the support surface, surrounded by the second inner surface, and covering the internal space; an outer cover coupled to at least a portion of the base and covering the inner cover; A disk device comprising:

2. the exposed region is closer to the magnetic disk than the covered region; 2. The disk device according to claim 1.

3. the exposed region includes a first exposed region, a second exposed region, and a third exposed region spaced apart from one another around the rotation axis; the base extends in a second direction perpendicular to the rotation axis; On a projection surface viewed in the first direction, the first exposed area faces an edge of the magnetic disk in the second direction, the second exposed area faces an edge of the magnetic disk in a third direction perpendicular to the first direction and the second direction, and the third exposed area faces an edge of the magnetic disk in a fourth direction opposite to the third direction.

3. The disk device according to claim 2.

4. the base further has an outer surface opposite the second inner surface; the distance between the exposed region and the outer surface is shorter than the distance between the covered region and the outer surface; 2. The disk device according to claim 1.

5. the distance between the inner cover and the exposed region is shorter than the distance between the inner cover and the membrane; 2. The disk device according to claim 1.

6. The inner cover has a side surface facing the membrane and a protrusion protruding from the side surface toward the exposed area.

6. The disk device according to claim 5.

7. The length of the protrusion around the rotation axis is shorter than the length of the exposed region.

7. The disk device according to claim 6.

8. a gasket having a first portion located between the magnetic disk and the film on a projection surface seen in the first direction, and a second portion located between the magnetic disk and the exposed area on the projection surface and bent so as to protrude from the first portion toward the exposed area, the gasket being interposed between the support surface and the inner cover; 8. The disk device according to claim 6, further comprising:

9. a gasket interposed between the support surface and the inner cover; Further comprising: In a projection plane viewed in the first direction, a width of the gasket between the magnetic disk and the exposed region is narrower than a width of the gasket between the magnetic disk and the film.

2. The disk device according to claim 1.

10. The outer cover is bonded to the end surface.

2. The disk device according to claim 1.

11. the base further includes an inclined surface extending obliquely with respect to the second inner surface and the end surface between the second inner surface and the end surface, a length of the inclined surface between the exposed region and the end surface is shorter than a length of the inclined surface between the covered region and the end surface; The disk drive according to claim 10.

12. The diameter of the magnetic disk is 96 mm or more.

2. The disk device according to claim 1.

13. the exposed area is spaced from the support surface and faces the inner cover; 2. The disk device according to claim 1.

14. the inner cover is spaced further from the support surface than an end of the exposed area in a fifth direction opposite to the first direction; The disk drive according to claim 13.

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