disc device

Abstract

Provided is a disk device capable of making an arm thin. One embodiment relates to a disk device including a magnetic disk, a first head, a first suspension, and a carriage. The first suspension has a flexible first substrate on which the first head is mounted. The carriage has an arm on which the first suspension is mounted. The arm has a first end surface, a second end surface on the opposite side of the first end surface, a side surface extending between the first end surface and the second end surface, and a protrusion separated from the first end surface and the second end surface in an axial direction and protruding from the side surface. The first substrate has a first band portion extending along the side surface. The first band portion has a first portion between the first end surface and the protrusion in the axial direction, and a second portion between the first end surface and the second end surface in the axial direction.

Description

[0001] Related applications

[0002] This application enjoys priority based on Japanese Patent Application No. 2022-147874 (filed on September 16, 2022). This application incorporates the entire contents of the basic application by reference. Technical Field

[0003] Embodiments of the present invention relate to a disk device. Background Technology

[0004] Disk devices such as hard disk drives (HDDs) include disks, heads, and head stacking assemblies (HSAs). An HSA has a rotating carriage and a head gimbal assembly (HGA) on which the heads are mounted.

[0005] The HGA is mounted on the arm of the carriage. Additionally, the HGA has a flexible substrate (flexible element) for mounting the read / write head. Various electrical signals input to or output from the read / write head flow through the wiring in the flexible element.

[0006] A portion of the flexible element is held in the arm, for example. Because the portion holding the flexible element is formed in the arm, it is difficult to design the arm to be thin. Summary of the Invention

[0007] This embodiment provides a disc device that enables the arm to be thin.

[0008] One embodiment of the disk apparatus includes a plurality of disks, a first read / write head, a first suspension, and a carriage. Each of the plurality of disks has a recording surface. The first read / write head is configured to read and write information to one of the plurality of disks. The first suspension has a flexible first base plate on which the first read / write head is mounted. The carriage has an arm on which the first suspension is mounted, configured to move the first read / write head relative to the plurality of disks by rotating about a rotation axis. The arm has a first end face facing one of the plurality of disks when the first read / write head is positioned above the recording surface, a second end face opposite to the first end face, a side surface extending between the first and second end faces, and a protrusion separating from the first and second end faces and protruding from the side surface in an axial direction along the rotation axis. The first base plate has a first strip extending along the side surface. The first belt portion has a first part located axially between the first end face and the protrusion, and axially located between the first end face and the second end face. Attached Figure Description

[0009] Figure 1 This is an exemplary perspective view showing an HDD according to the first embodiment, disassembled.

[0010] Figure 2 This is an exemplary cross-sectional view showing a portion of the HDD of the first embodiment.

[0011] Figure 3 This is an exemplary top view showing the HGA and arm of the first embodiment.

[0012] Figure 4 This is an exemplary side view showing a portion of a plurality of disks and a portion of a plurality of HSAs according to the first embodiment.

[0013] Figure 5 It is to combine a portion of the plurality of disks and a portion of the plurality of HSAs in the first embodiment along Figure 4 An illustrative sectional view shown along line F5-F5.

[0014] Figure 6 This is an illustrative side view showing a portion of the plurality of disks and a portion of the plurality of HSAs involved in the second embodiment.

[0015] Figure 7 It is to combine a portion of the multiple disks and a portion of the multiple HSAs of the second embodiment along... Figure 6 An illustrative sectional view shown along line F7-F7.

[0016] Explanation of reference numerals in the attached figures

[0017] 10…Hard disk drive (HDD), 12, 12A, 12B…Disk, 14…Head, 31…Recording surface, 38, 38A, 38B…Head universal joint assembly (HGA), 39…Arm damper, 42…Arm, 53, 53A, 53B…Flexible element, 56, 56A, 56B…Tail, 61…First end face, 62…Second end face, 63…Side, 64, 200…Protrusion , 71, 72, 73… retaining protrusions, 81, 82, 83, 91, 92, 93, 211… parallel sections, 84, 85, 94, 95… inclined sections, 201… hole, 220… retainer, 221… first limiting wall, 224… first mounting protrusion, Ax… central axis, S1… first gap, S2… second gap, Ta, Td, Tp… thickness, Tc1, Tc2… depth. Detailed Implementation

[0018] (First Embodiment)

[0019] The following is for reference Figures 1-5The first embodiment will now be described. Furthermore, in this specification, the constituent elements involved in the embodiment and their descriptions are sometimes described using multiple expressions. The constituent elements and their descriptions are merely examples and are not limited to the expressions in this specification. Constituent elements can also be identified by names different from those used in this specification. Additionally, constituent elements can also be described using expressions different from those used in this specification.

[0020] Figure 1 This is an exemplary perspective view showing an exploded view of the hard disk drive (HDD) 10 according to the first embodiment. The HDD 10 is an example of a disk device, and can also be referred to as an electronic device, storage device, external storage device, or disk drive. The HDD 10 is, for example, a near-online HDD. However, the HDD 10 is not limited to this example.

[0021] like Figure 1 As shown, the HDD 10 includes a housing 11, multiple disks 12, a spindle motor 13, multiple heads 14, a head stack assembly (HSA) 15, a voice coil motor (VCM) 16, a ramp loading mechanism 17, a flexible printed circuit board (FPC) 18, and a printed circuit board (PCB) 19. The housing 11 can also be referred to as the substrate. The heads 14 and FPC 18 may also be included in the HSA 15.

[0022] Figure 2 This is an illustrative cross-sectional view showing a portion of the HDD10 according to the first embodiment. (See attached image.) Figure 2 As shown, for convenience, the +Z direction and the -Z direction are defined in this specification. The +Z direction is a direction along the thickness of the HDD10. The -Z direction is the opposite direction of the +Z direction.

[0023] The housing 11 has a base 21, an inner cover 22, and an outer cover 23. However, the housing 11 is not limited to this example. The base 21, the inner cover 22, and the outer cover 23 may each be made of a metal material such as aluminum alloy. Furthermore, the materials of the base 21, the inner cover 22, and the outer cover 23 may also be different from each other.

[0024] like Figure 1 As shown, the base 21 is formed as a generally rectangular box with an inner chamber S disposed on the inner side of the base 21. The inner chamber S opens to the outside of the base 21 in the +Z direction. The housing 11 houses a plurality of disks 12, a spindle motor 13, a plurality of magnetic heads 14, an HSA 15, a VCM 16, a ramp loading mechanism 17, and an FPC 18 within the inner chamber S.

[0025] The substrate 21 has a bottom wall 25 and a side wall 26. The bottom wall 25 is formed into a plate-like shape that is generally rectangular (quadrilateral) and extends in a manner that is generally orthogonal to the +Z direction. The side wall 26 protrudes from the edge of the bottom wall 25 in a generally +Z direction and is formed into a generally rectangular frame shape. The bottom wall 25 and the side wall 26 are integrally formed.

[0026] The inner cover 22 is mounted to the end of the side wall 26 in the +Z direction, for example by screws, blocking the inner chamber S. The outer cover 23 covers the inner cover 22 and is mounted to the end of the side wall 26 in the +Z direction, for example by welding.

[0027] A vent 27 is provided in the inner cover 22. A vent 28 is provided in the outer cover 23. After the components are installed inside the base 21 and the inner cover 22 and outer cover 23 are installed in the base 21, air inside the housing 11 is extracted through the vents 27 and 28. Furthermore, a gas different from air is filled into the housing 11.

[0028] The gas filled inside the casing 11 may be a low-density gas with a lower density than air, or an inert gas with low reactivity. For example, helium may be filled inside the casing 11. Alternatively, other fluids may be filled inside the casing 11. Furthermore, the interior of the casing 11 may be maintained as a vacuum, a low pressure close to a vacuum, or a negative pressure lower than atmospheric pressure.

[0029] The vent 28 of the outer cover 23 is blocked by the seal 29. The seal 29 airtightly seals the vent 28 to prevent fluid filling the interior of the housing 11 from leaking out of the vent 28.

[0030] Multiple disks 12 are arranged in a disk-like shape, extending orthogonally to the +Z direction. The diameter of each disk 12 is, for example, approximately 3.5 inches. Figure 2 As shown, the HDD 10 of this embodiment has, for example, 13 disks 12. That is, the number of disks 12 is 11 or more. Furthermore, the diameter and number of disks 12 are not limited to this example.

[0031] Each of the plurality of disks 12 has, for example, at least one recording surface 31. The recording surface 31 is disposed on at least one of the upper and lower surfaces of the disk 12. In other words, the plurality of recording surfaces 31 are either surfaces of the disk 12 facing approximately the +Z direction or surfaces of the disk 12 facing approximately the -Z direction. The recording surface 31 is a generally flat surface orthogonal to the +Z direction. A magnetic recording layer of the disk 12 is disposed on the recording surface 31.

[0032] Figure 1 The spindle motor 13 supports and rotates a plurality of disks 12 that are spaced apart and overlapped in the +Z or -Z direction. The plurality of disks 12 are held in the hub of the spindle motor 13, for example by clamping springs.

[0033] Each of the multiple read / write heads 14 records and reproduces information on a corresponding recording surface 31 of the multiple disks 12. In other words, each of the multiple read / write heads 14 reads and writes information on one of the multiple disks 12.

[0034] The HSA15 is rotatably supported by a support shaft 35 located in a position detached from the disk 12. The support shaft 35 extends, for example, from the bottom wall 25 of the housing 11 in a generally +Z direction.

[0035] HSA15 is capable of rotating about its central axis Ax. The central axis Ax is an example of a rotation axis, and is an imaginary axis extending in the +Z and -Z directions. The central axis Ax is, for example, the center of rotation of HSA15, and also the central axis of the support shaft 35.

[0036] For convenience, axial, radial, and circumferential directions are defined below. The axial direction is along the central axis Ax. In this embodiment, the central axis Ax extends in both the +Z and -Z directions. Therefore, the axial direction includes both the +Z and -Z directions. The radial direction is a direction orthogonal to the central axis Ax, including multiple directions orthogonal to the central axis Ax. The circumferential direction is a direction of rotation about the central axis Ax, including clockwise and counterclockwise rotation about the central axis Ax.

[0037] VCM16 rotates HSA15 about the central axis Ax, positioning it in the desired position. If the read / write head 14 moves to the outermost periphery of the disk 12 due to the rotation of HSA15 achieved by VCM16, the ramp loading mechanism 17 holds the read / write head 14 in a position detached from the disk 12.

[0038] Figure 3 This is an exemplary top view showing the HGA38 and arm 42 of the first embodiment. Figure 3 As shown, the HSA15 has a carriage 37, multiple head universal joint assemblies (HGA) 38, and multiple arm dampers 39. The arm dampers 39 are an example of retainers and limiting walls. Figure 2 As shown, the carriage 37 has an actuator block 41, multiple arms 42 and a coil holder 43.

[0039] The actuator block 41 is rotatably supported on the support shaft 35, for example via a bearing. Multiple arms 42 protrude radially outward from the actuator block 41. Alternatively, the HSA 15 may be segmented, with arms 42 protruding from each of the multiple actuator blocks 41.

[0040] Multiple arms 42 are arranged axially at intervals. Each arm 42 is formed as a plate capable of entering the gap between adjacent disks 12. The multiple arms 42 extend generally parallel to each other.

[0041] In this embodiment, the carriage 37 has 14 arms 42. The number of arms 42 is one more than the number of disks 12. Furthermore, the number of arms 42 is not limited to this example.

[0042] The coil retainer 43 protrudes in the opposite direction to the direction in which the actuator block 41 protrudes toward the arm 42. The coil retainer 43 holds the voice coil of the VCM16. The VCM16 has the voice coil, a pair of yokes, and magnets disposed on the yokes.

[0043] The actuator block 41, the plurality of arms 42, and the coil holder 43 are formed integrally from aluminum, for example. Furthermore, the materials of the actuator block 41, the arms 42, and the coil holder 43 are not limited to this example.

[0044] like Figure 3 As shown, multiple HGA38s are mounted on the top portion of a corresponding arm 42 of a plurality of arms 42, protruding from that arm 42. Thus, the multiple HGA38s are arranged at intervals in the Z direction. Each of the multiple HGA38s has a base plate 51, a load beam 52, and a flexure 53.

[0045] The base plate 51 and the load bar 52 are made of stainless steel, for example. However, the materials of the base plate 51 and the load bar 52 are not limited to this example. The base plate 51 is formed in a plate shape and is attached to the top of the arm 42, for example, by riveting.

[0046] The load bar 52 is mounted on the top end of the base plate 51 and protrudes from the base plate 51 in a direction orthogonal to the central axis Ax. The load bar 52 is thinner than the base plate 51 and is formed into a plate shape that is approximately orthogonal to the axial direction.

[0047] The flexible element 53 is formed in the form of an elongated strip. The flexible element 53 is, for example, a flexible substrate having a metal plate (backing layer) such as stainless steel, an insulating layer formed on the metal plate, a conductive layer formed on the insulating layer and constituting a plurality of wirings (wiring patterns), and a protective layer (insulating layer) covering the conductive layer. However, the flexible element 53 is not limited to this example.

[0048] The flexible member 53 has a universal joint portion 55 (elastic support portion) and a tail portion 56. The universal joint portion 55 and the tail portion 56 are each part of the flexible member 53 and have at least one of a metal plate, an insulating layer, a conductive layer and a protective layer.

[0049] Universal joint 55 is located at one end of flexible member 53 and is situated on load rod 52. A magnetic head 14 is mounted on universal joint 55. Thus, flexible member 53 is electrically connected to magnetic head 14.

[0050] The universal joint 55 has, for example, a frame-like portion mounted on the load bar 52 and a portion for mounting the magnetic head 14 and capable of elastically shifting relative to the frame-like portion. Furthermore, the universal joint 55 is not limited to this example.

[0051] Tail section 56 extends along arm 42 from universal joint section 55 on load bar 52 toward actuator block 41. Alternatively, other sections may be provided between universal joint section 55 and tail section 56. The end of tail section 56 is connected to one end of FPC 18 mounted on actuator block 41. The other end of FPC 18 is connected, for example, to a connector provided on bottom wall 25.

[0052] Figure 1 The PCB 19 is, for example, a rigid substrate such as a glass epoxy board, or a multilayer substrate or a laminated substrate. The PCB 19 is disposed on the outside of the housing 11 and mounted on the bottom wall 25.

[0053] PCB 19 contains various electronic components, such as a relay connector for connecting to FPC 18, an interface (I / F) connector for connecting to the host computer, and a controller for controlling the operation of HDD 10. The relay connector is electrically connected to FPC 18 via a connector located on the bottom wall 25.

[0054] For example, the controller of PCB19 drives VCM16, causing HSA15 to rotate about its central axis Ax. This causes the read / write head 14 of the HGA38 mounted on HSA15 to move relative to the disks 12. In other words, the carriage 37 of HSA15 moves the read / write head 14 relative to the plurality of disks 12 by rotating about its central axis Ax.

[0055] like Figure 2 As shown, arm damper 39 is mounted on arm 42. Arm damper 39 has, for example, a constraint plate made of stainless steel, aluminum, or synthetic resin and a viscoelastic material layer to which the constraint plate is attached to arm 42. Vibration of arm 42 is mitigated by displacement of the constraint plate.

[0056] Figure 4 This is an exemplary side view showing a portion of the plurality of disks 12 and a portion of the plurality of HSAs 15 according to the first embodiment. Figure 4 As shown, in the following description, sometimes two disks 12 out of a plurality of disks 12 are independently referred to as disks 12A and 12B. Additionally, sometimes two HGA38 out of a plurality of HGA38s are independently referred to as HGA38A and 38B.

[0057] Disk 12A is an example of one of a plurality of disks. Disk 12B is an example of another of a plurality of disks. HGA38A is an example of the first suspension. HGA38B is an example of the second suspension.

[0058] Two disks 12A and 12B are adjacent in the axial direction. Disk 12B is separated from disk 12A in the -Z direction. Hereinafter, an arm 42 located in the axial direction between the two disks 12A and 12B and HGA38A and 38B mounted on this arm 42 will be described in detail. In addition, the multiple arms 42 have substantially the same shape as each other.

[0059] The flexible element 53 included in the HGA38A is referred to as flexible element 53A. Flexible element 53A is an example of the first substrate. Furthermore, the tail portion 56 of flexible element 53A is referred to as tail portion 56A. Tail portion 56A is an example of the first strip portion.

[0060] One of the multiple heads 14 mounted on the flexible element 53A is an example of the first head. The head 14 mounted on the flexible element 53A reads and writes information to the disk 12A.

[0061] The flexible element 53 included in the HGA38B is referred to as flexible element 53B. Flexible element 53B is an example of a second substrate. Furthermore, the tail portion 56 of flexible element 53B is referred to as tail portion 56B. Tail portion 56B is an example of a second strip portion.

[0062] One of the multiple heads 14 mounted on the flexible element 53B is an example of a second head. The head 14 mounted on the flexible element 53B reads and writes information to the disk 12B.

[0063] Arm 42 has a first end face 61, a second end face 62, a side face 63, and a protrusion 64. The first end face 61 is formed to be generally flat and faces approximately +Z. The second end face 62 is located on the opposite side of the first end face 61. The second end face 62 is formed to be generally flat and faces approximately -Z.

[0064] The read / write head 14, mounted on the flexible member 53A, is positioned on the recording surface 31 of the disk 12A through the gap between the two disks 12A and 12B via the arm 42. Furthermore, the read / write head 14, mounted on the flexible member 53B, is located on the recording surface 31 of the disk 12B.

[0065] When the read / write head 14 is positioned above the recording surface 31, the first end face 61 faces the recording surface 31 of the disk 12A with a gap. Furthermore, the second end face 62 faces the recording surface 31 of the disk 12B with a gap.

[0066] Figure 5 It is to connect a portion of the plurality of disks 12 and a portion of the plurality of HSAs 15 in the first embodiment along Figure 4 An illustrative sectional view shown along line F5-F5. For example... Figure 5 As shown, the side surface 63 extends between the edge of the first end face 61 and the edge of the second end face 62. The side surface 63 is formed to be generally flat and faces a direction that is generally orthogonal to the axial direction.

[0067] Protrusion 64 protrudes from side 63. Protrusion 64 is axially separated from the first end face 61 in the -Z direction and from the second end face 62 in the +Z direction. That is, protrusion 64 is the portion of arm 42 that is thinner than the portion having the first end face 61 and the second end face 62. Protrusion 64 has a first guide surface 67, a second guide surface 68, and a side end face 69.

[0068] The first guide surface 67 is generally flat and faces approximately the +Z direction. Axially, the first guide surface 67 separates from the first end face 61 in the -Z direction. The second guide surface 68 is located on the opposite side of the first guide surface 67. The second guide surface 68 is generally flat and faces approximately the -Z direction. Axially, the second guide surface 68 separates from the second end face 62 in the +Z direction.

[0069] The first end face 61, the second end face 62, the first guide face 67, and the second guide face 68 are formed substantially parallel to each other. Furthermore, the first end face 61, the second end face 62, the first guide face 67, and the second guide face 68 are not limited to this example.

[0070] The side end face 69 extends between the edge of the first guide face 67 and the edge of the second guide face 68. The side end face 69 is formed to be generally flat and faces a direction that is generally orthogonal to the axial direction. The direction in which the side end face 69 faces may be generally the same as or different from the direction in which the side face 63 faces.

[0071] like Figure 4 As shown, in this embodiment, the center of the protrusion 64 is located axially between the first end face 61 and the second end face 62. The center of the axially protruding protrusion 64 is also located axially between the first guide surface 67 and the second guide surface 68.

[0072] By setting protrusion 64, the first notch C1 and the second notch C2 are formed in arm 42. For example... Figure 5 As shown, the first notch C1 is a space formed (defined or demarcated) by the side surface 63 and the first guide surface 67. The first notch C1 opens outwards towards the +Z direction of the arm 42. The second notch C2 is a space formed by the side surface 63 and the second guide surface 68. The second notch C2 opens outwards towards the -Z direction of the arm 42. Alternatively, a component different from the arm 42 may block at least one of the first notch C1 and the second notch C2.

[0073] like Figure 4 As shown, the protrusion 64 in this embodiment has a plurality of retaining protrusions 71, 72, and 73. Retaining protrusion 71 is an example of a first retaining protrusion. Retaining protrusion 72 is an example of a second retaining protrusion. Retaining protrusion 73 is an example of a third retaining protrusion.

[0074] Multiple retaining protrusions 71, 72, and 73 each protrude from the side 63. These multiple retaining protrusions 71, 72, and 73 are arranged in a generally straight line, spaced apart, along the direction of extension of the arm 42. (As shown) Figure 3 As shown, retaining protrusion 71 is closer to the base plate 51, load rod 52, universal joint 55, and magnetic head 14 than retaining protrusions 72 and 73. Retaining protrusion 72 is closer to the actuator block 41 than retaining protrusions 71 and 73. Retaining protrusion 73 is located between retaining protrusions 71 and 72.

[0075] A first gap S1 is provided between the retaining protrusion 71 and the retaining protrusion 73. The first gap S1 is an example of a first clearance. A second gap S2 is provided between the retaining protrusion 72 and the retaining protrusion 73. The second gap S2 is an example of a second clearance.

[0076] The protrusion 64 is divided into three retaining protrusions 71, 72, and 73 by the first slit S1 and the second slit S2. Therefore, each of the three retaining protrusions 71, 72, and 73 has a portion of a first guide surface 67 and a portion of a second guide surface 68. The first guide surfaces 67 of the three retaining protrusions 71, 72, and 73 are disposed on substantially the same plane. Furthermore, the second guide surfaces 68 of the three retaining protrusions 71, 72, and 73 are disposed on substantially the same plane.

[0077] According to another description, each of the first slit S1 and the second slit S2 has a through protrusion 64 in a direction (e.g., axial) intersecting the length direction of the arm 42. Each of the first slit S1 and the second slit S2 has an opening on the first guide surface 67, the second guide surface 68 and the side end surface 69, connecting the first notch C1 and the second notch C2.

[0078] like Figure 5 As shown, in this embodiment, the thickness Ta of arm 42 is thinner than the thickness Td of each of the plurality of disks 12. The thickness Ta of arm 42 is the axial distance between the first end face 61 and the second end face 62.

[0079] For example, the thickness Ta of arm 42 is set to approximately 0.470 mm. That is, the thickness Ta is set to 0.400 mm to 0.650 mm. On the other hand, the thickness Td of each of the plurality of disks 12 is 0.500 mm or more, for example, set to approximately 0.635 mm. Furthermore, the thicknesses Ta and Td are not limited to this example.

[0080] The depths Tc1 of the first notch C1 and Tc2 of the second notch C2 are each shorter than the thickness Tp of the protrusion 64. Depth Tc1 is the axial distance between the first end face 61 and the first guide face 67 of the protrusion 64. Depth Tc2 is the axial distance between the second end face 62 and the second guide face 68 of the protrusion 64. Thickness Tp is the axial distance between the first guide face 67 and the second guide face 68.

[0081] For example, the depth Tc1 of the first notch C1 and the depth Tc2 of the second notch C2 are each set to approximately 0.110 mm. The thickness Tp of the protrusion 64 is set to approximately 0.250 mm. Furthermore, the depths Tc1, Tc2, and thickness Tp are not limited to this example.

[0082] The thickness of each of the tail portions 56A and 56B is thinner than the depth Tc1 of the first notch C1 and thinner than the depth Tc2 of the second notch C2. The thickness of each of the tail portions 56A and 56B is, for example, 0.040 mm.

[0083] The thickness Ta of arm 42 is shorter than the distance Dd between the plurality of disks 12 in the axial direction. The distance Dd is 1.100 mm to 1.200 mm, for example, it is set to 1.132 mm. However, the distance Dd is not limited to this example.

[0084] like Figure 4 As shown, the tail portions 56A and 56B extend along the side 63 of the arm 42. In other words, the side 63 faces the tail portions 56A and 56B. Moreover, the tail portions 56A and 56B are located axially between the first end face 61 and the second end face 62. Alternatively, a portion of the tail portions 56A and 56B may temporarily protrude axially from the area between the first end face 61 and the second end face 62.

[0085] In this embodiment, the tail portions 56A and 56B are each bent or flexed by passing through the first gap S1 and the second gap S2. In other words, the tail portions 56A and 56B are engaged with the retaining protrusions 71, 72, and 73 through the first gap S1 and the second gap S2.

[0086] The tail section 56A has three parallel sections 81, 82, and 83 and two inclined sections 84 and 85. Parallel section 82 is an example of the second part. Parallel section 83 is an example of the first part. Inclined section 85 is an example of the third part.

[0087] Each of the parallel portions 81, 82, and 83 is a part of a tail portion 56A that extends substantially parallel to the first end face 61, the second end face 62, the first guide face 67, and the second guide face 68. Furthermore, the parallel portions 81, 82, and 83 may also be inclined relative to the first end face 61, the second end face 62, the first guide face 67, and the second guide face 68.

[0088] Each of the inclined portions 84 and 85 is a portion of a tail portion 56A that extends obliquely relative to the first end face 61, the second end face 62, the first guide face 67, and the second guide face 68. Figure 4 In the example, the parallel sections 81, 82, 83 and the inclined sections 84, 85 extend in a straight line. However, the parallel sections 81, 82, 83 and the inclined sections 84, 85 can also extend in a curved line.

[0089] The parallel section 81 is located outside the first notch C1 and the second notch C2, for example, connected to the universal joint section 55. The parallel section 81 is located axially near the first end face 61. For example, the parallel section 81 is located axially between the protrusion 64 and the first end face 61. However, the parallel section 81 is not limited to this example.

[0090] The parallel portion 82 is disposed in the second notch C2. The parallel portion 82 is located axially between the second end face 62 and the retaining protrusion 71 of the protrusion 64. The side face 63 and the second guide surface 68 of the retaining protrusion 71 face towards the parallel portion 82. The parallel portion 82 extends along the second guide surface 68 of the retaining protrusion 71.

[0091] The parallel portion 83 is disposed in the first notch C1. The parallel portion 83 is located axially between the first end face 61 and the retaining protrusions 72 and 73 of the protrusion 64. The side face 63 and the first guide surface 67 of the retaining protrusions 72 and 73 face the parallel portion 83. The parallel portion 83 extends along the first guide surface 67 of the retaining protrusions 72 and 73.

[0092] The inclined portion 84 extends between one end of the parallel portion 81 and one end of the parallel portion 82. The inclined portion 85 extends between the other end of the parallel portion 82 and one end of the parallel portion 83 through the first gap S1. In this way, the tail portion 56A is bent or flexed relative to the parallel portions 81 and 83 extending along the first end face 61 so that the parallel portion 82 and the inclined portions 84 and 85 are engaged with the retaining protrusion 71.

[0093] The tail section 56B has three parallel sections 91, 92, and 93 and two inclined sections 94 and 95. Parallel section 91 is an example of section 4. Parallel section 92 is an example of section 5. Parallel section 93 is an example of section 7. Inclined section 94 is an example of section 6. Inclined section 95 is an example of section 8.

[0094] Each of the parallel portions 91, 92, and 93 is a part of a tail portion 56B that extends substantially parallel to the first end face 61, the second end face 62, the first guide face 67, and the second guide face 68. Furthermore, the parallel portions 91, 92, and 93 may also be inclined relative to the first end face 61, the second end face 62, the first guide face 67, and the second guide face 68.

[0095] Each of the inclined portions 94 and 95 is a portion of a tail portion 56B that extends obliquely relative to the first end face 61, the second end face 62, the first guide face 67, and the second guide face 68. Figure 4 In the example, the parallel sections 91, 92, 93 and the inclined sections 94, 95 extend in a straight line. However, the parallel sections 91, 92, 93 and the inclined sections 94, 95 can also extend in a curved line.

[0096] Parallel section 91 is connected to universal joint section 55. A portion of parallel section 91 is disposed in the second notch C2. Parallel section 91 is located axially between the second end face 62 and the retaining protrusion 71. Side surface 63 and the second guide surface 68 of retaining protrusion 71 face parallel section 91. Parallel section 91 extends along the second guide surface 68 of retaining protrusion 71.

[0097] Parallel portion 92 is disposed in the first notch C1. Parallel portion 92 is located axially between the first end face 61 and the retaining protrusion 73 of the protrusion 64. The side face 63 and the first guide surface 67 of the retaining protrusion 73 face towards parallel portion 92. Parallel portion 92 extends along the first guide surface 67 of the retaining protrusion 73.

[0098] Parallel portion 93 is disposed in the second notch C2. Parallel portion 93 is located axially between the second end face 62 and the retaining protrusion 72 of the protrusion 64. The side face 63 and the second guide surface 68 of the retaining protrusion 72 face towards parallel portion 93. Parallel portion 93 extends along the second guide surface 68 of the retaining protrusion 72.

[0099] The inclined portion 94 extends between one end of the parallel portion 91 and one end of the parallel portion 92 through the first slit S1. The inclined portion 95 extends between the other end of the parallel portion 92 and one end of the parallel portion 93 through the second slit S2. In this way, the tail portion 56B is bent or flexed relative to the parallel portions 91 and 93 extending along the second end face 62 so that the parallel portions 92 and the inclined portions 94 and 95 are engaged with the retaining protrusion 73.

[0100] At the first notch C1, the parallel portion 83 of the tail 56A and the parallel portion 92 of the tail 56B overlap. The parallel portion 92 of the tail 56B is located between the retaining protrusion 73 and the parallel portion 83 of the tail 56A.

[0101] At the second notch C2, the parallel portion 82 of the tail 56A and the parallel portion 91 of the tail 56B overlap. The parallel portion 82 of the tail 56A is located between the retaining protrusion 71 and the parallel portion 91 of the tail 56B.

[0102] Tail portion 56A is pre-bent or bent with parallel portions 81, 82, 83 and inclined portions 84, 85, and is then mounted to arm 42. Similarly, tail portion 56B is pre-bent or bent with parallel portions 91, 92, 93 and inclined portions 94, 95, and is then mounted to arm 42. Therefore, tail portions 56A and 56B can be easily mounted to arm 42. Furthermore, one of tail portions 56A and 56B may also extend in a straight line without being bent.

[0103] For example, due to vibration of HSA15, or the need to restore the bent tail 56A, a force in the +Z direction may sometimes act on the tail 56A. In this case, the second guide surface 68 of the retaining protrusion 71 restricts the movement of the tail 56A in the +Z direction by supporting the parallel portion 82. Thus, the retaining protrusion 71 restricts the parallel portions 81, 83 to be further separated from the protrusion 64 than the first end face 61.

[0104] On the other hand, sometimes a force in the -Z direction may act on the tail portion 56A. In this case, the first guide surface 67 of the retaining protrusions 72 and 73 restricts the tail portion 56A from moving in the -Z direction by supporting the parallel portion 83. Thus, the retaining protrusions 72 and 73 restrict the parallel portion 82 from being separated from the protrusion 64 by a greater distance than the second end face 62.

[0105] As described above, protrusions 71, 72, and 73 are engaged with the tail portion 56A, restricting axial movement of the tail portion 56A. Thus, protrusions 71, 72, and 73 axially hold the tail portion 56A within the range between the first end face 61 and the second end face 62.

[0106] Similar to tail 56A, sometimes a force in the +Z direction is applied to tail 56B. In this case, the second guide surface 68 of the retaining protrusions 71, 72 restricts the movement of tail 56B in the +Z direction by supporting parallel portions 91, 93. Thus, the retaining protrusions 71, 72 restrict the parallel portion 92 to be separated from the protrusion 64 by a greater distance than the first end face 61.

[0107] On the other hand, sometimes a force in the -Z direction may act on the tail 56B. In this case, the first guide surface 67 of the retaining protrusion 73 restricts the tail 56B from moving in the -Z direction by retaining the parallel portion 92. Thus, the retaining protrusion 73 restricts the parallel portions 91, 93 from separating further from the protrusion 64 than the second end face 62.

[0108] As described above, protrusions 71, 72, and 73 are engaged with the tail portion 56B, restricting axial movement of the tail portion 56B. Thus, protrusions 71, 72, and 73 axially hold the tail portion 56B within the range between the first end face 61 and the second end face 62.

[0109] In this embodiment, the distance between the first slit S1 and the base plate 51 is shorter than the distance between the first slit S1 and the actuator block 41. Furthermore, the distance between the second slit S2 and the base plate 51 is shorter than the distance between the second slit S2 and the actuator block 41.

[0110] The ends of tail portions 56A and 56B are mounted to FPC18. Furthermore, tail portions 56A and 56B are engaged with retaining protrusions 71, 72, and 73 at a position far from FPC18. Therefore, retaining protrusions 71, 72, and 73 can effectively retain tail portions 56A and 56B axially within the range between the first end face 61 and the second end face 62.

[0111] like Figure 5 As shown, one of the multiple arm dampers 39 is attached to the first end face 61. Furthermore, another arm damper 39 is attached to the second end face 62. Alternatively, the arm damper 39 may be attached to only one of the first end face 61 and the second end face 62.

[0112] An arm damper 39, attached to the first end face 61, extends beyond the side face 63. The arm damper 39 covers a portion of the parallel portion 83 of the tail 56A in the axial direction. Thus, the arm damper 39 limits the parallel portion 83 to be separated from the protrusion 64 by a greater distance than the first end face 61.

[0113] An arm damper 39, attached to the second end face 62, extends beyond the side face 63. The arm damper 39 axially covers a portion of the parallel portion 93 of the tail 56B. Thus, the arm damper 39 limits the parallel portion 93 to being further separated from the protrusion 64 than the second end face 62.

[0114] In the HDD 10 according to the first embodiment described above, the arm 42 has a first end face 61, a second end face 62 opposite to the first end face 61, a side surface 63 extending between the first end face 61 and the second end face 62, and a protrusion 64 that is axially separated from the first end face 61 and the second end face 62 and protrudes from the side surface 63. The flexible member 53A has a tail portion 56A extending along the side surface 63. The tail portion 56A has a parallel portion 83 located axially between the first end face 61 and the protrusion 64. The tail portion 56A is located axially between the first end face 61 and the second end face 62. That is, the arm 42 is provided with two first notches C1 and second notches C2 formed by the protrusion 64 and the side surface 63 and recessed from the first end face 61 and the second end face 62, respectively. The tail portion 56A is received in the first notches C1 and the second notches C2 of the arm 42.

[0115] Conventionally, slots located on the sides of the arm typically accommodate the strip portion of a flexible component. To form the slot in the arm, two axially separated portions are provided, with the slot formed in the middle. The thickness of these two axially separated portions and the slot itself may be a certain degree of thickness, depending on the required strength of these portions and the performance of the tool.

[0116] On the other hand, in the HDD 10 of this embodiment, a protrusion 64 is provided on the arm 42, and the aforementioned first notch C1 and second notch C2 on both sides of the protrusion 64, which are provided in the axial direction, accommodate the tail portion 56A. Generally, the arm 42 is manufactured by machining. The first notch C1 and second notch C2, which are shallow in depth Tc1 and Tc2, can be easily formed compared to a narrow groove. Therefore, even if the protrusion 64 has a certain thickness Tp in the axial direction, the arm 42 can be made thin in the axial direction by making the first notch C1 and second notch C2 shallow. By making the arm 42 thin, the HDD 10 of this embodiment can have more disks 12, thereby increasing the storage capacity.

[0117] For example, the Small Form Factor Committee (SFF-8300) sets several maximum dimensions (hereinafter referred to as specified dimensions) for the 3.5-inch hard disk drive (HDD) in the Z direction. One specified dimension determined by SFF-8300 is 26.10 mm. In this embodiment, the HDD 10 can accommodate 11 or more disks 12 within this specified dimension range by making the thickness Ta of the arm 42 approximately 0.470 mm, the thickness Td of the disk 12 approximately 0.500 mm, and the axial distance between the disk 12 and the arm 42 approximately 0.331 mm.

[0118] The protrusion 64 has a plurality of retaining protrusions 71, 72, and 73 that protrude from the side 63 and are arranged with gaps between them. The tail portion 56A also has a parallel portion 82 and an inclined portion 85. The parallel portion 82 is located axially between the second end face 62 and the protrusion 64. The inclined portion 85 extends between the parallel portion 83 and the parallel portion 82 through the gap (first gap S1) between the plurality of retaining protrusions 71, 72, and 73. Thus, the tail portion 56A is mounted on the protrusion 64 in a manner that restricts it from being axially separated from the protrusion 64 by a greater distance than the first end face 61 and from the protrusion 64 by a greater distance axially than the second end face 62. Therefore, the HDD 10 of this embodiment can suppress interference between the tail portion 56A and the disk 12. Furthermore, the HDD10 of this embodiment can mount the tail 56A to the protrusion 64 without the use of adhesives or other components, and the flexible members 53A and 53B can be easily removed from the arm 42, for example, during repairs.

[0119] Parallel portions 83 are axially located between retaining protrusions 72 and 73 and the first end face 61. Parallel portions 82 are axially located between retaining protrusion 71 and the second end face 62. Inclined portions 85 extend between parallel portions 83 and 82 through a first gap S1 between retaining protrusions 71 and 73. Tail portion 56B has parallel portions 91, 92, and 93 and inclined portions 94 and 95. Parallel portion 91 is axially located between the second end face 62 and the retaining protrusion 71. Parallel portion 92 is axially located between the first end face 61 and the retaining protrusion 73. Inclined portion 94 extends between parallel portions 91 and 92 through the first gap S1. Parallel portion 93 is axially located between the second end face 62 and the retaining protrusion 72. Inclined portion 95 extends between parallel portions 92 and 93 through a second gap S2 between retaining protrusions 72 and 73. That is, the tail portions 56A and 56B are bent or flexed alternately and installed on the protrusion 64 through the gaps between the multiple retaining protrusions 71, 72, and 73. Thus, the tail portions 56A and 56B are each installed on the protrusion 64 in a manner that limits their axial separation from the protrusion 64 to a greater distance than the first end face 61 and from the protrusion 64 to a greater distance than the second end face 62. Therefore, the HDD 10 of this embodiment can suppress interference between the tail portions 56A and 56B and the disk. Furthermore, the HDD 10 of this embodiment can install the tail portions 56A and 56B on the protrusion 64 without the use of adhesives or other components, and the flexible members 53A and 53B can be easily removed from the arm 42, for example, during repair.

[0120] An arm damper 39 is mounted on the arm 42. The arm damper 39 limits the parallel portion 83 from being separated from the protrusion 64 by covering at least a portion of the parallel portion 83 in the axial direction. Thus, the HDD 10 of this embodiment can suppress interference between the tail portion 56A and the disk 12 without complicating the shape of the arm 42.

[0121] In the axial direction, the distance (depth Tc1) between the protrusion 64 and the first end face 61 is shorter than the thickness Tp of the protrusion 64. Furthermore, in the axial direction, the distance (depth Tc2) between the protrusion 64 and the second end face 62 is shorter than the thickness Tp of the protrusion 64. That is, the first notch C1 and the second notch C2 of the arm 42 are formed shallowly. Therefore, the arm 42 can be formed thin in the axial direction.

[0122] In the axial direction, the center of the protrusion 64 is located at the center between the first end face 61 and the second end face 62. That is, the depths of the first notch C1 and the second notch C2 provided on both sides of the protrusion 64 are approximately the same. Therefore, the HDD 10 of this embodiment can prevent the tail portion 56A from protruding from the first notch C1 and the second notch C2 and interfering with the disk 12. In addition, the HDD 10 can set the angle at which the tail portions 56A and 56B bend or flex to be approximately the same.

[0123] The distance (thickness Ta) between the first end face 61 and the second end face 62 along the axial direction is thinner than the thickness Td of each of the multiple disks. That is, the arm 42 is formed to be relatively thin. As a result, the arm 42 is lightweight, and thus the rotation of the carriage 37 and the movement of the read / write head 14 can be accelerated.

[0124] (Second Implementation)

[0125] The following is for reference Figure 6 and Figure 7 The second embodiment will now be described. Furthermore, in the following description of the embodiments, components having the same function as the previously described components are labeled with the same reference numerals, and sometimes the description is omitted. Additionally, multiple components labeled with the same reference numerals may not all share the same function and properties, and may have different functions and properties corresponding to each embodiment.

[0126] Figure 6 This is an exemplary side view showing a portion of the plurality of disks 12A, 12B and a portion of the plurality of HSA15 involved in the second embodiment. Figure 7 It is to connect a portion of the plurality of disks 12A, 12B and a portion of the plurality of HSA15 in the second embodiment along Figure 6 An illustrative sectional view shown along line F7-F7.

[0127] like Figure 7 As shown, the arm 42 of the second embodiment has a protrusion 200 instead of the protrusion 64. The protrusion 200 is substantially the same as the protrusion 64 of the first embodiment, except for the points described below.

[0128] In the second embodiment, the protrusion 200 is not divided by the first slit S1 and the second slit S2. Alternatively, the protrusion 200 may be divided by the first slit S1 and the second slit S2 in the same manner as in the first embodiment.

[0129] A plurality of holes 201 are provided on the protrusion 200. The plurality of holes 201 pass through the protrusion 200 in a generally axial direction at mutually separated positions. Thus, each of the plurality of holes 201 opens on a first guide surface 67 and a second guide surface 68. Each of the plurality of holes 201 has, for example, a circular cross-section.

[0130] In the second embodiment, the tail portion 56A has a parallel portion 211 instead of the parallel portions 81, 82, 83 and the inclined portions 84, 85. The parallel portion 211 is an example of the first part. In the second embodiment, the tail portion 56B has a parallel portion 212 instead of the parallel portions 91, 92, 93 and the inclined portions 94, 95.

[0131] The parallel portions 211 and 212 extend substantially parallel to the first end face 61, the second end face 62, the first guide face 67, and the second guide face 68. Furthermore, the parallel portions 211 and 212 may also be inclined relative to the first end face 61, the second end face 62, the first guide face 67, and the second guide face 68.

[0132] Parallel section 211 is disposed in the first notch C1. Parallel section 211 is located axially between the first end face 61 and the first guide face 67 of the protrusion 200. Side face 63 and the first guide face 67 of the protrusion 200 face towards parallel section 211. Parallel section 211 extends along the first guide face 67 of the protrusion 200.

[0133] Parallel section 212 is disposed in the second notch C2. Parallel section 212 is located axially between the second end face 62 and the second guide face 68 of the protrusion 200. Side face 63 and the second guide face 68 of the protrusion 200 face towards parallel section 212. Parallel section 212 extends along the second guide face 68 of the protrusion 200.

[0134] The HSA15 of the second embodiment also has a plurality of retainers 220. The retainers 220 are made of, for example, synthetic resin. Furthermore, the material of the retainers 220 is not limited to this example. Each of the plurality of retainers 220 is detachably mounted to a protrusion 200 of a corresponding arm 42.

[0135] Each of the plurality of retainers 220 has a first limiting wall 221, a second limiting wall 222, a side wall 223, a plurality of first mounting protrusions 224, and a plurality of second mounting protrusions 225. The first limiting wall 221 is an example of a limiting wall. The first mounting protrusions 224 are examples of mounting protrusions. However, the retainers 220 are not limited to this example.

[0136] The first limiting wall 221 and the second limiting wall 222 extend substantially parallel to the first end face 61, the second end face 62, the first guide face 67, and the second guide face 68. Furthermore, the first limiting wall 221 and the second limiting wall 222 may also be inclined relative to the first end face 61, the second end face 62, the first guide face 67, and the second guide face 68.

[0137] The first limiting wall 221 and the second limiting wall 222 are axially separated from each other. The second limiting wall 222 separates from the first limiting wall 221 in the -Z direction. The protrusion 200, the parallel portion 211 of the tail 56A, and the parallel portion 212 of the tail 56B are located between the first limiting wall 221 and the second limiting wall 222.

[0138] In the axial direction, the retainer 220, including the first limiting wall 221 and the second limiting wall 222, is located between the first end face 61 and the second end face 62. The side face 63 faces the first limiting wall 221 and the second limiting wall 222. In this embodiment, the first limiting wall 221 and the second limiting wall 222 are separated from the side face 63. Furthermore, the first limiting wall 221 and the second limiting wall 222 are not limited to this example.

[0139] The parallel portion 211 is located between the first limiting wall 221 and the protrusion 200. Thus, the first limiting wall 221 covers at least a portion of the parallel portion 211 in the axial direction, limiting the parallel portion 211 to be further separated from the protrusion 200 than the first end face 61.

[0140] The parallel portion 212 is located between the second limiting wall 222 and the protrusion 200. Thus, the second limiting wall 222 covers at least a portion of the parallel portion 212 in the axial direction, limiting the parallel portion 212 to be further separated from the protrusion 200 than the second end face 62.

[0141] The sidewall 223 extends between the edge of the first limiting wall 221 and the edge of the second limiting wall 222. The sidewall 223 is separate from the protrusion 200. In addition, the sidewall 223 may also contact the protrusion 200.

[0142] Multiple first mounting protrusions 224 protrude from the first limiting wall 221 in a generally -Z direction. The multiple first mounting protrusions 224 are, for example, formed into a generally conical shape that tapers towards the -Z direction. Each of the multiple first mounting protrusions 224 engages with a corresponding hole 201 among the multiple holes 201. The first mounting protrusions 224 restrict movement of the retainer 220 relative to the protrusions 200 by abutting against the edge of the hole 201.

[0143] Multiple second mounting protrusions 225 protrude from the second limiting wall 222 in a generally +Z direction. The multiple second mounting protrusions 225 are, for example, formed into a generally conical shape that tapers towards the +Z direction. Each of the multiple second mounting protrusions 225 engages with a corresponding hole 201 among the multiple holes 201. The second mounting protrusions 225 restrict movement of the retainer 220 relative to the protrusions 200 by abutting against the edges of the holes 201.

[0144] The retainer 220, made of synthetic resin, presses the first mounting protrusion 224 into the hole 201 and the second mounting protrusion 225 into the hole 201 by the restoring force from elastic deformation. Thus, the first mounting protrusion 224 presses against the edge of the hole 201, and the second mounting protrusion 225 presses against the edge of the hole 201. Therefore, movement of the retainer 220 relative to the protrusion 200 can be suppressed. Furthermore, the retainer 220 can be detached from the protrusion 200 with elastic deformation.

[0145] In the HDD 10 of the second embodiment described above, the retainer 220 is mounted on the arm 42 and has a first limiting wall 221. The first limiting wall 221 limits the parallel portion 211 from being separated from the protrusion 200 by covering at least a portion of the parallel portion 211 in the axial direction. Thus, the HDD 10 of this embodiment can suppress interference between the tail portion 56A and the disk 12 without complicating the shape of the arm 42.

[0146] The retainer 220 is made of synthetic resin and is detachably mounted to the protrusion 200. Thus, the HDD 10 of this embodiment can have its tail 56A mounted to the protrusion 200 without the use of adhesives or other components, and the flexible member 53A can be easily removed from the arm 42, for example, during repair.

[0147] The protrusion 200 has a plurality of holes 201. The retainer 220 has a plurality of first mounting protrusions 224 that engage with the plurality of holes 201. The plurality of first mounting protrusions 224 restrict movement of the retainer 220 relative to the protrusion 200 by abutting against the edges of the plurality of holes 201. Thus, the retainer 220 can be mounted to the protrusion 200 without the use of adhesives or other components. Moreover, rotation of the retainer 220 can be suppressed, thereby suppressing the generation of dust due to contact between the retainer 220 and the side 63.

[0148] The HDD 10 in the second embodiment may also omit the retainer 220. In this case, for example, the parallel section 211 is bonded to the first guide surface 67, and the parallel section 212 is bonded to the second guide surface 68. Thus, the HDD 10 can suppress interference between the tail sections 56A, 56B and the disk 12 without complicating the shape of the arms 42.

[0149] In the above description, suppression is defined, for example, as preventing the occurrence of an event, effect, or influence, or reducing the degree of an event, effect, or influence. Similarly, in the above description, restriction is defined, for example, as preventing movement or rotation, or allowing movement or rotation within a predetermined range and preventing movement or rotation beyond that predetermined range.

[0150] While some embodiments of the invention have been described, these embodiments are given by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in a wide variety of other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included within the scope and spirit of the invention, and are included within the scope of the invention as set forth in the claims and their equivalents.

Claims

1. A disk device comprising: Multiple disks are arranged at intervals along the axis, each having a recording surface; The first read / write head is configured to read and write information on one of the plurality of disks; The first suspension has a flexible first base plate on which the first magnetic head is mounted; and The carriage, having an arm on which the first suspension is mounted, is configured to move the first read / write head relative to the plurality of disks by rotating about a rotation axis extending along the axial direction. The arm has a first end face configured to face one of the plurality of disks when the first magnetic head is positioned above the recording surface, a second end face opposite to the first end face, a side surface extending between the first end face and the second end face, and a protrusion axially separated from the first end face and the second end face and projecting from the side surface. The first substrate has a first strip extending along the side surface. The first belt portion has a first part located axially between the first end face and the protrusion, and also located axially between the first end face and the second end face. The protrusion has a plurality of retaining protrusions that protrude from the side and are arranged with gaps between them. The first belt portion further includes a second portion located axially between the second end face and the protrusion, and a third portion extending between the first portion and the second portion through the gap between the plurality of retaining protrusions.

2. The disk device according to claim 1, The disk device also includes: The second read / write head is configured to read and write information to one of the other disks in the plurality of disks; and The second suspension has a flexible second base plate on which the second magnetic head is mounted, and is mounted on the arm. The second substrate has a second strip extending along the side surface. The plurality of retaining protrusions includes a first retaining protrusion, a second retaining protrusion, and a third retaining protrusion located between the first retaining protrusion and the second retaining protrusion. The first portion is located axially between the second and third retaining protrusions and the first end face. The second portion is located axially between the first retaining protrusion and the second end face. The third portion extends between the first portion and the second portion through a first gap between the first retaining protrusion and the third retaining protrusion. The second belt portion has a fourth portion located axially between the second end face and the first retaining protrusion, a fifth portion located axially between the first end face and the third retaining protrusion, a sixth portion extending between the fourth portion and the fifth portion through the first gap, a seventh portion located axially between the second end face and the second retaining protrusion, and an eighth portion extending between the fifth portion and the seventh portion through the second gap between the second retaining protrusion and the third retaining protrusion.

3. The disk device according to claim 1, The disc assembly also includes a retainer mounted on the arm. The retainer has a limiting wall that restricts the first portion from separating further from the protrusion than the first end face by covering at least a portion of the first portion in the axial direction.

4. The disc device according to claim 3, The retainer is made of synthetic resin and is detachably mounted to the protrusion.

5. The disc device according to claim 4, The protrusion is provided with multiple holes. The retainer has a plurality of mounting protrusions that fit into the plurality of holes. The plurality of mounting protrusions are configured to restrict movement of the retainer relative to the protrusions by abutting against the edges of the plurality of holes.

6. The disc device according to any one of claims 1 to 5, In the axial direction, the distance between the protrusion and the first end face is shorter than the thickness of the protrusion, and the distance between the protrusion and the second end face is shorter than the thickness of the protrusion.

7. The disc device according to any one of claims 1 to 5, In the axial direction, the center of the protrusion is located at the center between the first end face and the second end face.

8. The disc device according to any one of claims 1 to 5, The distance between the first end face and the second end face along the axial direction is thinner than the thickness of each of the plurality of disks.

9. The disk device according to claim 8, The arm is located axially between two adjacent disks among the plurality of disks.

10. The disc device according to any one of claims 1 to 5, The number of disks is 11 or more.

11. The disc device according to any one of claims 1 to 5, The distance between the first end face and the second end face in the axial direction is 0.4mm to 0.65mm.

12. The disc device according to any one of claims 1 to 5, The distance between the plurality of disks along the axial direction is 1.1mm to 1.2mm.

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