Disk device

Abstract

Provided is a disk device that can be easily manufactured. A disk device according to an embodiment includes a plurality of magnetic disks, a plurality of arms, a suspension, and a first damper. The plurality of disks are arranged along a first rotation axis. The arms are arranged along a second rotation axis. The arm has a first side surface, a second side surface provided with a slit, a first surface facing the first magnetic disk, a second surface facing the second magnetic disk, a first seat surface, and a second seat surface. The arm is provided with a first recess that opens in the first side surface and the first surface and that is closer to the first rotating shaft than the slit. The suspension is supported by the first seat surface or the second seat surface, and is partially accommodated in the slit. The first damper is disposed in the first recess and attached to the arm.

Description

[0001] This application claims the priority of Japanese Patent Application No. 2023-109034 (filing date: July 3, 2023) as a basic application. The present application incorporates the entire contents of the basic application by reference. Technical Field

[0002] An embodiment of the present invention relates to a disk device. Background Art

[0003] A disk device such as a hard disk drive (HDD) includes, for example, a magnetic disk, a magnetic head for reading and writing information on the magnetic disk, a suspension for supporting the magnetic head, and a carriage for moving the magnetic head and the suspension. Furthermore, the disk device may also include a damper for attenuating vibration of an arm of the carriage.

[0004] The damping member is mounted on the surface of the arm, for example. A gap is provided between the damping member and the magnetic disk, for example, to suppress the damping member from contacting the magnetic disk due to vibration. However, providing a large gap between the damping member and the magnetic disk sometimes makes it difficult to manufacture the disk device. Summary of the invention

[0005] The embodiments of the present invention provide a disk device that can be easily manufactured.

[0006] The disk device according to the present embodiment includes a plurality of disks, a plurality of arms, a plurality of suspensions, and a plurality of first damping members. The plurality of disks are arranged along a first rotation axis and can rotate around the first rotation axis. The plurality of arms are arranged along a second rotation axis separated from the first rotation axis and can enter into a gap between two adjacent disks among the plurality of disks by rotating around the second rotation axis. The plurality of arms each have: a first side surface facing the first rotation axis; a second side surface located on the opposite side of the first side surface and having a gap; a first surface facing the first disk as one of the two disks; a second surface facing the second disk as the other of the two disks; a first seat surface facing the first disk, being farther from the first disk than the first surface, and being farther from the second rotation axis than the first surface; and a second seat surface facing the second disk, being farther from the second disk than the second surface, and being farther from the second rotation axis than the second surface. The plurality of arms are respectively provided with a first recess, the first recess being open at the first side surface and the first surface, and being closer to the first rotation axis than the slit in a direction orthogonal to the first rotation axis. The plurality of suspensions are respectively supported by the first seat surface or the second seat surface, and are partially accommodated in the slit and mounted on the plurality of arms. The plurality of first damping members are respectively arranged in the first recess, mounted on the plurality of arms, and configured to attenuate vibrations of the plurality of arms. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is an exemplary perspective view showing the HDD according to the first embodiment in an exploded manner.

[0008] Figure 2 It is an exemplary plan view partially showing the HGA and the arm according to the first embodiment.

[0009] Figure 3 This is an exemplary cross-sectional view showing a part of the HDD according to the first embodiment.

[0010] Figure 4 It is along Figure 2 The F4 - F4 line shows an exemplary cross-sectional view of the HSA according to the first embodiment.

[0011] Figure 5 This is an exemplary cross-sectional view showing the carriage and the combined milling cutter according to the first embodiment.

[0012] Figure 6 It is an exemplary plan view showing the carriage and the combined milling cutter according to the first embodiment.

[0013] Figure 7 It is an exemplary cross-sectional view showing the HSA according to the second embodiment.

[0014] Figure 8 This is an exemplary cross-sectional view showing a carriage and a combined milling cutter according to a second embodiment.

[0015] Fig. 9 This is an exemplary cross-sectional view showing a part of the HSA according to the third embodiment.

[0016] Description of Reference Numerals

[0017] 10 hard disk drive (HDD); 12, 12U, 12L disk; 42 arm; 42a first side; 42b second side; 42c first surface; 42d first seat surface; 42e second surface; 42f second seat surface; 51 gap; 52 through hole; 53, 201 first recess; 53a bottom surface; 53b edge; 54, 202 second recess; 54b edge; 62 suspension; 81 first damping member; 82 second damping member; 85, 87, 301 constraint layer; 86, 88 viscoelastic body; 305 first part; 306 second part; Axd, Axh center axis; L center line. DETAILED DESCRIPTION

[0018] (First embodiment)

[0019] Below, refer to Figure 1 to Figure 6The first embodiment is described. In addition, in this specification, the components involved in the embodiment and the description of the components are sometimes recorded by multiple expressions. The components and their descriptions are examples and are not limited by the descriptions in this specification. The components may also be identified by names different from the names in this specification. In addition, the components may also be described by expressions different from the descriptions in this specification.

[0020] In the following description, "suppression" is defined as, for example, preventing an event, action, or influence from occurring, or reducing the degree of an event, action, or influence. In addition, in the following description, "restriction" is defined as, for example, preventing movement or rotation, or allowing movement or rotation within a predetermined range and preventing movement or rotation beyond the predetermined range.

[0021] Figure 1 This is an exemplary perspective view showing an exploded hard disk drive (HDD) 10 according to the first embodiment. The HDD 10 is an example of a disk device, and may also be called an electronic device, a storage device, an external storage device, or a magnetic disk device.

[0022] like Figure 1 As shown, HDD 10 has housing 11, multiple magnetic disks 12, spindle motor 13, head stack assembly (HSA) 14, voice coil motor (VCM) 15, ramp loading mechanism 16 and printed circuit board (PCB) 17. Magnetic disk 12 may also be referred to as a disk or platter.

[0023] like Figure 1 As shown, in this specification, for convenience of explanation, the Z axis and the Z direction are defined. The Z axis is set along the thickness of the HDD 10. The Z direction is a direction along the Z axis, including the +Z direction indicated by the arrow of the Z axis and the -Z direction which is the opposite direction of the arrow of the Z axis.

[0024] The present invention is not limited to this example. The base 21, the inner cover 22, and the outer cover 23 are each made of a metal material such as an aluminum alloy. In addition, the materials of the base 21, the inner cover 22, and the outer cover 23 may be different from each other.

[0025] The base 21 is formed in a substantially rectangular parallelepiped box shape that is open in the +Z direction. The base 21 accommodates the plurality of magnetic disks 12 , the spindle motor 13 , the HSA 14 , the VCM 15 , and the ramp load mechanism 16 .

[0026] The base 21 has a bottom wall 25 and side walls 26. The bottom wall 25 is formed in a substantially rectangular (quadrilateral) plate shape arranged substantially orthogonal to the Z direction. The side walls 26 protrude from the edge of the bottom wall 25 substantially in the +Z direction and are formed in a substantially rectangular frame shape.

[0027] The inner cover 22 is attached to the end of the side wall 26 in the +Z direction by screws, for example, to close the base 21. The outer cover 23 covers the inner cover 22 and is attached to the end of the side wall 26 in the +Z direction by welding, for example.

[0028] The inner cover 22 is provided with a vent 27. Furthermore, the outer cover 23 is provided with a vent 28. After the components are mounted inside the base 21 and the inner cover 22 and the outer cover 23 are mounted on the base 21, the air inside the housing 11 is extracted from the vents 27 and 28. Furthermore, the inside of the housing 11 is filled with a gas different from air.

[0029] The gas filled in the shell 11 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 shell 11. In addition, other fluids may be filled in the shell 11. In addition, the inside of the shell 11 may also be maintained at a vacuum, a low pressure close to a vacuum, or a negative pressure lower than the atmospheric pressure.

[0030] The vent 28 of the outer cover 23 is blocked by a seal 29. The seal 29 seals the vent 28 in an airtight manner, and restricts leakage of the fluid filled in the housing 11 from the vent 28 to the outside of the housing 11.

[0031] The plurality of magnetic disks 12 are formed in a disk shape arranged substantially orthogonal to the Z direction. The plurality of magnetic disks 12 are arranged with gaps therebetween along the central axis Axd of the magnetic disks 12. The central axis Axd is an example of a first rotation axis and is a virtual axis extending substantially in the Z direction.

[0032] Each of the plurality of magnetic disks 12 has, for example, at least one recording surface 12a. The plurality of recording surfaces 12a are surfaces of the magnetic disk 12 that are generally oriented in the +Z direction, or surfaces of the magnetic disk 12 that are generally oriented in the -Z direction. The recording surface 12a is a generally flat surface that is generally orthogonal to the Z direction. The magnetic recording layer of the magnetic disk 12 is provided on the recording surface 12a.

[0033] The spindle motor 13 supports the plurality of magnetic disks 12 and rotates them around a central axis Axd. The central axis Axd is also the central axis of the spindle motor 13. The plurality of magnetic disks 12 are held on a hub of the spindle motor 13 by, for example, a clamp spring.

[0034] The housing 11 is provided with a support shaft 31 spaced apart from the magnetic disk 12 in a direction perpendicular to the central axis Axd. The support shaft 31 extends, for example, substantially in the +Z direction from the bottom wall 25 of the housing 11. The HSA 14 is rotatably supported by the support shaft 31.

[0035] The HSA 14 can rotate around the central axis Axh. The central axis Axh is an example of a second rotation axis and is an imaginary axis extending approximately in the Z direction. The central axis Axh is, for example, the center of rotation of the HSA 14 and is also the central axis of the support shaft 31. Therefore, the central axis Axh is separated from the central axis Axd of the magnetic disk 12 in a direction orthogonal to the central axis Axd.

[0036] The HSA 14 includes a carriage 35 , a plurality of head gimbal assemblies (HGA) 36 , and a flexible printed circuit board (FPC) 37 . The carriage 35 includes an actuator block 41 , a plurality of arms 42 , and a coil holder 43 .

[0037] The actuator block 41, the plurality of arms 42, and the coil holder 43 are integrally formed of, for example, an aluminum alloy. In addition, the materials of the actuator block 41, the arms 42, and the coil holder 43 are not limited to this example.

[0038] The actuator block 41 is supported by the support shaft 31 via a bearing, for example, so as to be rotatable around the central axis Axh. Thus, the carriage 35 is rotatable around the central axis Axh.

[0039] The plurality of arms 42 protrude from the actuator block 41 in a direction substantially perpendicular to the central axis Axh. Alternatively, the HSA 14 may be divided so that the arms 42 protrude from the plurality of actuator blocks 41 .

[0040] Figure 2 FIG. 4 is an illustrative top view partially showing the HGA 36 and the arm 42 of the first embodiment. Figure 2 As shown, in this specification, for the convenience of explanation, an X-axis and a Y-axis are also defined. The X-axis, the Y-axis, and the Z-axis are orthogonal to each other. The Y-axis is set along the arm 42. Further, in this specification, an X direction and a Y direction are also defined. The X direction is a direction along the X-axis, including the +X direction indicated by the arrow of the X-axis and the -X direction which is the opposite direction of the arrow of the X-axis. The Y direction is a direction along the Y-axis, including the +Y direction indicated by the arrow of the Y-axis and the -Y direction which is the opposite direction of the arrow of the Y-axis.

[0041] A plurality of arms 42 protrude from the actuator block 41 in the +Y direction. Therefore, the Y direction is the long side direction of the arm 42. The X direction is the short side direction of the arm 42. The X direction and the Y direction change by the rotation of the carriage 35 around the central axis Axh. The central axis Axd of the magnetic disk 12 is away from the arm 42 in a substantially -X direction.

[0042] The actuator block 41 has a plurality of side surfaces 41a, 41b, and 41c. The side surface 41a is generally oriented in the +Y direction. The side surface 41b is generally oriented in the -X direction. The side surface 41c extends between the side surfaces 41a and 41b at an angle with respect to the X direction and the Y direction. A plurality of arms 42 protrude from the side surfaces 41a and 41c of the actuator block 41 in the +Y direction.

[0043] The side surface 41c extends obliquely with respect to the X direction and the Y direction, so that the actuator block 41 is provided with a notch 45. The notch 45 can prevent the actuator block 41 from contacting the magnetic disk 12 when rotating about the central axis Axh.

[0044] The arms 42 are arranged with gaps in the Z direction along the central axis Axh. The arms 42 extend substantially in parallel. The arms 42 are formed in a plate shape arranged substantially orthogonal to the Z direction. That is, the magnetic disks 12 and the arms 42 are arranged substantially in parallel.

[0045] By rotating the carriage 35 including the arms 42 in one direction around the central axis Axh, each of the plurality of arms 42 can enter a gap between two adjacent disks 12 among the plurality of disks 12. By rotating the carriage 35 in another direction around the central axis Axh, each of the plurality of arms 42 can come out of a gap between two adjacent disks 12.

[0046] Figure 3 FIG. 1 is an exemplary cross-sectional view showing a portion of the HDD 10 according to the first embodiment. Figure 3 As shown, when describing each of the plurality of arms 42, two adjacent magnetic disks 12 among the plurality of magnetic disks 12 are referred to as magnetic disks 12U and 12L. The magnetic disk 12U is an example of a magnetic disk and a first magnetic disk, and the magnetic disk 12L is an example of a second magnetic disk.

[0047] The arm 42 described above enters between the two magnetic disks 12U and 12L by the carriage 35 including the arm 42 rotating about the central axis Axh. The magnetic disk 12U moves away from the arm 42 in the +Z direction. The magnetic disk 12L moves away from the arm 42 in the −Z direction.

[0048] Each of the plurality of magnetic disks 12 may be a magnetic disk 12U with respect to one arm 42 , and may be a magnetic disk 12L with respect to another arm 42 . Figure 3 In the figure, for the sake of explanation, one of the plurality of disks 12 is represented as a disk 12U, and another one of the plurality of disks 12 is represented as a disk 12L.

[0049] Figure 1The coil holder 43 protrudes from the actuator block 41 in the -Y direction. The coil holder 43 holds the voice coil of the VCM 15. The VCM 15 includes the voice coil, a pair of yokes, and a magnet provided on the yokes.

[0050] The plurality of arms 42 each have Figure 2 The first side surface 42a, the second side surface 42b, the first surface 42c and the first seat surface 42d are shown. Figure 3 The second surface 42e and the second seat surface 42f are shown. The first seat surface 42d is an example of a seat surface.

[0051] Figure 2 The first side surface 42a shown in the figure is generally oriented toward the -X direction. That is, the first side surface 42a is oriented toward the central axis Axd. In addition, the first side surface 42a may be temporarily changed not to be oriented toward the central axis Axd by rotating the carriage 35 around the central axis Axh.

[0052] The second side surface 42b is located on the opposite side of the first side surface 42a. The second side surface 42b is generally oriented toward the +X direction. The first side surface 42a and the second side surface 42b are close to each other toward the end of the arm 42 in the +Y direction. That is, between the first side surface 42a and the second side surface 42b, the arm 42 becomes thinner toward the front end in the +Y direction.

[0053] The first side surface 42a is continuous with the side surface 41b of the actuator block 41. The first side surface 42a is not limited to this example. Since the notch 45 is provided in the actuator block 41, the first side surface 42a is longer than the second side surface 42b.

[0054] The first surface 42c and the first seat surface 42d are formed to be substantially flat and substantially face the +Z direction. The first surface 42c and the first seat surface 42d face the magnetic disk 12U. In addition, by rotating the carriage 35 around the central axis Axh, the first surface 42c and the first seat surface 42d may temporarily not face the magnetic disk 12U.

[0055] The first seat surface 42d is provided at the end of the arm 42 in the +Y direction. Therefore, the first seat surface 42d is farther from the central axis Axh than the first surface 42c. In addition, the first seat surface 42d is farther from the magnetic disk 12U than the first surface 42c.

[0056] like Figure 3 As shown, the second surface 42e is located on the opposite side of the first surface 42c. The second seat surface 42f is located on the opposite side of the first seat surface 42d. The second surface 42e and the second seat surface 42f are formed to be substantially flat and are substantially oriented in the -Z direction.

[0057] The second surface 42e and the second seat surface 42f face the magnetic disk 12L. In addition, the second surface 42e and the second seat surface 42f may be temporarily changed not to face the magnetic disk 12L by the rotation of the carriage 35 around the central axis Axh.

[0058] The second seat surface 42f is provided at the end of the arm 42 in the +Y direction. Therefore, the second seat surface 42f is farther from the central axis Axh than the second surface 42e. In addition, the second seat surface 42f is farther from the magnetic disk 12L than the second surface 42e.

[0059] Each of the plurality of arms 42 is provided with Figure 2 The slit 51, the through hole 52 and the first recess 53 are shown. Figure 3 The first recess 53 and the second recess 54 may also be referred to as steps or notches. In addition, the arm 42 may also omit the second recess 54.

[0060] like Figure 2 As shown, the slit 51 is provided on the second side surface 42b. The slit 51 is separated from the first surface 42c and the second surface 42e, and extends substantially linearly between both ends of the second side surface 42b in the Y direction.

[0061] The through hole 52 penetrates the arm 42 in the substantially +Z direction so as to open at the first seat surface 42d and the second seat surface 42f. The through hole 52 is a substantially circular hole. The shape of the through hole 52 is not limited to this example. The through hole 52 is farther from the central axis Axh than the slit 51.

[0062] The first recess 53 is provided on the first surface 42c and extends to reach the first side surface 42a. Therefore, the first recess 53 opens on the first side surface 42a and the first surface 42c. The entire first recess 53 is closer to the central axis Axd than the gap 51 in the direction orthogonal to the central axis Axd. In addition, the first recess 53 is separated from the first seat surface 42d and the actuator block 41.

[0063] The second recess 54 is provided on the second surface 42e and extends to reach the first side surface 42a. Therefore, the second recess 54 opens on the first side surface 42a and the second surface 42e. The entire second recess 54 is closer to the central axis Axd than the gap 51 in a direction orthogonal to the central axis Axd. In addition, the second recess 54 is separated from the second seat surface 42f and the actuator block 41.

[0064] The arm 42 further includes a bottom surface 53a of the first recess 53 and a bottom surface 54a of the second recess 54. The bottom surface 53a is an example of a mounting surface. The bottom surface 53a is provided at the bottom of the first recess 53 in the Z direction. Therefore, the first seat surface 42d is farther from the center axis Axh than the bottom surface 53a. The bottom surface 54a is provided at the bottom of the second recess 54 in the Z direction. Therefore, the second seat surface 42f is farther from the center axis Axh than the bottom surface 54a.

[0065] The bottom surface 53a is formed to be substantially flat and substantially faces the +Z direction. The bottom surface 53a faces the magnetic disk 12U. In the Z direction, the bottom surface 53a is farther from the magnetic disk 12U than the first surface 42c. Further, in the Z direction, the bottom surface 53a is farther from the magnetic disk 12U than the first seat surface 42d. Therefore, in the Z direction along the central axis Axh, the depth of the first recess 53 is greater than the distance between the first surface 42c and the first seat surface 42d.

[0066] The bottom surface 54a is formed to be substantially flat and substantially oriented in the -Z direction. The bottom surface 54a is oriented toward the magnetic disk 12L. In the Z direction, the bottom surface 54a is farther from the magnetic disk 12L than the second surface 42e. Further, in the Z direction, the bottom surface 54a is farther from the magnetic disk 12L than the second seat surface 42f. Therefore, in the Z direction along the central axis Axh, the depth of the second recess 54 is greater than the distance between the second surface 42e and the second seat surface 42f.

[0067] The edge 53b of the first recess 53 in the first surface 42c and the edge 54b of the second recess 54 in the second surface 42e are mirror-symmetrical to each other. In the Z direction along the central axis Axh, the depth of the first recess 53 is substantially equal to the depth of the second recess 54. Therefore, the first recess 53 and the second recess 54 in the first embodiment are mirror-symmetrical to each other.

[0068] In such Figure 2 Thus, in the projection diagram viewed in the Z direction along the central axis Axh, the first recess 53 and the second recess 54 are not line-symmetrical with respect to the central line L. The central line L is an imaginary straight line extending between the central axis Axh and the center of the through hole 52 .

[0069] In this embodiment, the first recess 53 and the second recess 54 become thinner toward the front end from the first side surface 42a toward the second side surface 42b. That is, the width of the first recess 53 in the first side surface 42a is larger than the width of the end of the first recess 53 farthest from the first side surface 42a.

[0070] The first recess 53 and the second recess 54 are partially disposed in the notch 45 of the actuator block 41. In other words, in the Y direction, a portion of the first recess 53 and the second recess 54 is closer to the central axis Axh than the side surface 41a of the actuator block 41.

[0071] The plurality of HGAs 36 are mounted on the first seat surface 42d or the second seat surface 42f so as to protrude from the arm 42 in the substantially +Y direction. Thus, the plurality of HGAs 36 are arranged with gaps in the Z direction along the central axis Axh. The HGAs 36 mounted on the first seat surface 42d are formed substantially mirror-symmetrically with respect to the HGAs 36 mounted on the second seat surface 42f.

[0072] Each of the plurality of HGAs 36 includes a magnetic head 61 and a suspension 62. That is, the HDD 10 includes a plurality of magnetic heads 61 and a plurality of suspensions 62. The magnetic head 61 may also be called a slider.

[0073] The magnetic head 61 records and reproduces information on a corresponding one of the recording surfaces 12a of the plurality of magnetic disks 12. In other words, the magnetic head 61 reads and writes information on the magnetic disk 12.

[0074] The suspension 62 is attached to the arm 42 and holds the magnetic head 61. The suspension 62 includes a base plate 65, a load beam 66, and a flexure 67.

[0075] The base plate 65 and the load beam 66 are made of, for example, stainless steel (SUS). The materials of the base plate 65 and the load beam 66 are not limited to this example. The base plate 65 and the load beam 66 may be made of different materials.

[0076] The base plate 65 includes a plate 71 and a boss 72. The plate 71 is formed in a substantially quadrilateral plate shape arranged substantially orthogonal to the Z direction. The plate 71 is supported by the first seat surface 42d or the second seat surface 42f.

[0077] The boss 72 protrudes from the plate 71. The boss 72 is formed in a substantially cylindrical shape and is inserted into the through hole 52 of the arm 42. The boss 72 is riveted to the arm 42. That is, the hanger 62 is attached to the arm 42 by being partially inserted into the through hole 52. In addition, the hanger 62 may be attached to the arm 42 by other methods.

[0078] The load beam 66 is formed in a plate shape thinner than the base plate 65. The load beam 66 is fixed to the plate 71 by, for example, spot welding. The load beam 66 extends from the plate 71 in substantially the +Y direction.

[0079] The flexible member 67 is a flexible printed wiring board formed in a long and thin strip shape and has, for example, a universal joint portion 75 and a suspension tail 76 .

[0080] The gimbal portion 75 is provided at the end of the flexible member 67 in the +Y direction. The gimbal portion 75 is elastically and rotatably supported on the load beam 66, and the magnetic head 61 is mounted thereon. The suspension tail 76 extends from the gimbal portion 75 toward the actuator block 41. In addition, other parts may be provided between the gimbal portion 75 and the suspension tail 76. The suspension tail 76 is partially accommodated in the gap 51.

[0081] The end of the suspension tail 76 in the -Y direction is connected to one end of the FPC 37 mounted on the actuator block 41. In other words, a portion of the suspension tail 76 extends between the universal joint 75 and the FPC 37 through the slit 51. The other end of the FPC 37 is connected to a connector provided on the bottom wall 25, for example.

[0082] The carriage 35 rotates about the center axis Axh to move the magnetic head 61 relative to the corresponding magnetic disk 12. The VCM 15 moves the magnetic head 61 to a desired position along the recording surface 12a of the magnetic disk 12 by rotating the carriage 35 about the center axis Axh.

[0083] When the head 61 moves to the outer edge of the magnetic disk 12 by the rotation of the HSA 14 based on the VCM 15, Figure 1 The ramp loading mechanism 16 holds the magnetic head 61 in a position away from the magnetic disk 12 .

[0084] Figure 1 The PCB 17 is, for example, a rigid substrate such as a glass epoxy substrate, a multi-layer substrate, or a build-up substrate. The PCB 17 is disposed outside the housing 11 and mounted on the bottom wall 25 .

[0085] Various electronic components such as a relay connector electrically connected to the FPC 37 , an interface (I / F) connector connected to a host computer, and a controller for controlling the operation of the HDD 10 are mounted on the PCB 17 . The relay connector is electrically connected to the FPC 37 via a connector provided on the bottom wall 25 .

[0086] The controller of PCB 17 drives VCM 15 to rotate HSA 14 around the central axis Axh. Thus, the controller controls the position of magnetic head 61. The controller can also adjust the position of magnetic head 61 by using a piezoelectric element provided in HGA 36.

[0087] Figure 4 It is along Figure 2 The F4-F4 line of FIG. 1 shows an exemplary cross-sectional view of the HSA 14 of the first embodiment. Figure 4 As shown, the HSA 14 further includes a plurality of first damping members 81 and a plurality of second damping members 82. The first damping member 81 is an example of a damping member. One first damping member 81 and one second damping member 82 are attached to one arm 42.

[0088] Each of the plurality of first damping members 81 includes a constrained layer 85 and a viscoelastic material (VEM) 86. In addition, the first damping member 81 is not limited to this example.

[0089] The constraining layer 85 is formed into a plate shape arranged in a manner substantially orthogonal to the Z direction. The constraining layer 85 is made of, for example, stainless steel. Therefore, the density (mass per unit volume) of the constraining layer 85 is approximately three times the density of the arm 42. That is, the density of the constraining layer 85 is greater than the density of the arm 42. In addition, the material of the constraining layer 85 is not limited to this example.

[0090] The rigidity of the viscoelastic body 86 is lower than that of the constraining layer 85. The viscoelastic body 86 is located between the constraining layer 85 and the bottom surface 53a of the first recess 53, and is attached to the constraining layer 85 and the bottom surface 53a. That is, the viscoelastic body 86 is interposed between the constraining layer 85 and the bottom surface 53a of the arm 42. Thus, the first damping member 81 is arranged in the first recess 53 and mounted on the bottom surface 53a of the arm 42.

[0091] like Figure 2 As shown, in the projection diagram observed in the Z direction along the central axis Axh, the shape of the first damping member 81 is substantially the same as the shape of the first recess 53, and is smaller than the first recess 53. Therefore, in the projection diagram observed in the Z direction along the central axis Axh, the first damping member 81 is not line-symmetrical with respect to the center line L.

[0092] like Figure 4 As shown, in the Z direction along the central axis Axh, the thickness of the first damper 81 is smaller than the depth of the first recess 53. Therefore, the entire first damper 81 is accommodated in the first recess 53. In addition, a portion of the first damper 81 may be located outside the first recess 53.

[0093] For example, in the Z direction, the depth of the first recess 53 is three times the thickness of the constraining layer 85. Furthermore, the thickness of the viscoelastic body 86 is substantially equal to the thickness of the constraining layer 85. The thicknesses of the constraining layer 85 and the viscoelastic body 86 are not limited to this example.

[0094] The second damping member 82 is arranged substantially mirror-symmetrically with respect to the first damping member 81. For example, each of the plurality of second damping members 82 includes a constraining layer 87 and a viscoelastic body 88. The constraining layer 87 is formed in a plate shape arranged substantially orthogonal to the Z direction. The constraining layer 87 is made of, for example, stainless steel. In addition, the material of the constraining layer 87 is not limited to this example.

[0095] The rigidity of the viscoelastic body 88 is lower than that of the constraining layer 87. The viscoelastic body 88 is located between the constraining layer 87 and the bottom surface 54a of the second recess 54, and is attached to the constraining layer 87 and the bottom surface 54a. That is, the viscoelastic body 88 is interposed between the constraining layer 87 and the bottom surface 54a of the arm 42. Thus, the second damping member 82 is arranged in the second recess 54 and attached to the bottom surface 54a of the arm 42.

[0096] In the projection viewed in the Z direction along the central axis Axh, the shape of the second damping member 82 is substantially the same as the shape of the second recess 54, but smaller than the second recess 54. Therefore, in the projection viewed in the Z direction along the central axis Axh, the second damping member 82 is not line-symmetrical with respect to the center line L.

[0097] The thickness of the second damper 82 in the Z direction along the central axis Axh is smaller than the depth of the second recess 54. Therefore, the entire second damper 82 is accommodated in the second recess 54. In addition, a portion of the second damper 82 may be located outside the second recess 54.

[0098] For example, in the Z direction, the depth of the second recess 54 is three times the thickness of the constraining layer 87. Furthermore, the thickness of the viscoelastic body 88 is substantially equal to the thickness of the constraining layer 87. The thicknesses of the constraining layer 87 and the viscoelastic body 88 are not limited to this example.

[0099] For example, the thickness of each of the constraining layers 85, 87 and the viscoelastic bodies 86, 88 is about 50 μm. The depth of the first recess 53 and the second recess 54 is about 150 μm. The thickness of the arm 42 between the first surface 42c and the second surface 42e is 0.8 mm. The thickness of the arm 42 between the first seat surface 42d and the second seat surface 42f is about 0.6 mm. The thickness of the arm 42 between the bottom surface 53a and the bottom surface 54a is about 0.5 mm. In addition, the above dimensions are not limited to this example.

[0100] When the arm 42 vibrates, the vibration of the arm 42 is transmitted to the first damping member 81 and the second damping member 82. As a result, the constraining layers 85 and 87 vibrate relative to the arm 42. The viscoelastic bodies 86 and 88 deform between the constraining layers 85 and 87 and the arm 42, converting the energy of the vibration into heat. As a result, the first damping member 81 and the second damping member 82 attenuate the vibration of the arm 42.

[0101] Since the vibration of the arm 42 is damped by the first damper 81 and the second damper 82, the HDD 10 can position the magnetic head 61 with high accuracy even when the recording density is high. That is, the HDD 10 can improve the recording density.

[0102] The first damper 81 is disposed in the first recess 53, and the second damper 82 is disposed in the second recess 54. Thus, in the portion where the first damper 81 and the second damper 82 are attached to the arm 42, the total thickness of the arm 42, the first damper 81, and the second damper 82 is reduced, and a sufficient distance can be provided between the first damper 81 and the magnetic disk 12U. In addition, a sufficient distance can be provided between the second damper 82 and the magnetic disk 12L.

[0103] Below, refer to Figure 5 and Figure 6, a method for forming the first recess 53 and the second recess 54 is exemplified as a part of the method for manufacturing the HDD 10. The method for forming the first recess 53 and the second recess 54 is not limited to the following method, and other methods may be used.

[0104] Figure 5 It is an exemplary cross-sectional view showing the carriage 35 and the gang cutter 100 according to the first embodiment. Figure 6 It is an exemplary plan view showing the carriage 35 and the combined milling cutter 100 according to the first embodiment.

[0105] like Figure 5 and Figure 6 As shown, for example, the combined milling cutter 100 has a first recess 53 and a second recess 54 formed on the arm 42. The combined milling cutter 100 has a plurality of blades 101. The blades 101 are formed in a substantially disc shape.

[0106] like Figure 5 As shown, the plurality of blades 101 are arranged with gaps along the central axis Axg of the blades 101. The plurality of blades 101 rotate integrally around the central axis Axg. In the present embodiment, the central axis Axg extends substantially in the Z direction.

[0107] The thickness of the blade 101 is larger than the distance between two adjacent arms 42 among the plurality of arms 42. In the present embodiment, the center of the blade 101 in the Z direction is arranged at the center between two adjacent arms 42.

[0108] The blade 101 can contact two adjacent arms 42 at the same time. Therefore, the blade 101 rotating around the central axis Axg simultaneously cuts the two arms 42. In the Z direction, the sum of the depth of the first recess 53, the depth of the second recess 54, and the distance between the two adjacent arms 42 is substantially equal to the thickness of the blade 101.

[0109] Figure 6 The arrows in FIG. 1 represent an example of the movement path of the center axis Axg relative to the arm 42 when the combined milling cutter 100 cuts the arm 42. Figure 6 As shown, the blade 101 forms a first recess 53 in one of the two arms 42 and a second recess 54 in the other of the two arms 42 by cutting the arm 42 from the first side surface 42a. The blade 101 is disc-shaped, and therefore, the first recess 53 and the second recess 54 become thinner toward the front end from the first side surface 42a toward the second side surface 42b.

[0110] The distance between the first side surface 42a and the slit 51 in the X direction is smaller than the radius of the blade 101. Therefore, the blade 101 can form the first recess 53 and the second recess 54 extending from the first side surface 42a to the vicinity of the slit 51. In addition, the distance between the first side surface 42a and the slit 51 may be larger than the radius of the blade 101.

[0111] For example, when one blade 101 forms the first recess 53 on one arm 42, the arm 42 is pressed in the approximate -Z direction. In other words, a force such that the arm 42 bends is applied to the arm 42 from the blade 101. However, the other blade 101 forms the second recess 54 on the arm 42, thereby pressing the arm 42 in the approximate +Z direction. That is, the two blades 101 support the arm 42 from both sides, thereby restricting the arm 42 from elastically bending.

[0112] The first seat surface 42d and the second seat surface 42f of the arm 42 can be formed by the combined milling cutter 100 in the same manner as the first recess 53 and the second recess 54. For example, the combined milling cutter 100 can cut the arm 42 with another blade having a thickness different from that of the blade 101 to form the first seat surface 42d and the second seat surface 42f.

[0113] In the Z direction, the thickness of the arm 42 between the first seat surface 42d and the second seat surface 42f is set to be greater than the total thickness of the two protrusions 72 embedded in the through hole 52. Therefore, it is possible to suppress the two protrusions 72 from interfering with each other. However, the thickness of the arm 42 between the first seat surface 42d and the second seat surface 42f is subject to design constraints.

[0114] On the other hand, the thickness of the arm 42 between the bottom surface 53a of the first recess 53 and the bottom surface 54a of the second recess 54 is unlikely to affect the interference of the two protrusions 72 in the through hole 52. Therefore, the design restriction on the depth of the first recess 53 and the second recess 54 is smaller than the design restriction on the thickness of the arm 42 between the first seat surface 42d and the second seat surface 42f. Therefore, the depth of the first recess 53 and the second recess 54 can be set to a depth that can suppress the first damping member 81 and the second damping member 82 from contacting the magnetic disks 12U and 12L.

[0115] In the HDD 10 involved in the first embodiment described above, the arm 42 has a first side surface 42a, a second side surface 42b, a first surface 42c, a first seat surface 42d, a second surface 42e, and a second seat surface 42f. The first side surface 42a faces the central axis Axd of the magnetic disk 12. The second side surface 42b is located on the opposite side of the first side surface 42a and is provided with a gap 51. The first surface 42c and the first seat surface 42d face the magnetic disk 12U. The second surface 42e and the second seat surface 42f face the magnetic disk 12L. The first seat surface 42d is farther from the magnetic disk 12U than the first surface 42c, and is farther from the central axis Axh of the arm 42 than the first surface 42c. The second seat surface 42f is farther from the magnetic disk 12L than the second surface 42e, and is farther from the central axis Axh than the second surface 42e. The arm 42 is provided with a first recess 53. The first recess 53 is open at the first side surface 42a and the first surface 42c, and is closer to the center axis Axd in a direction perpendicular to the center axis Axd than the slit 51. The suspension 62 is supported by the first seat surface 42d or the second seat surface 42f, and is partially accommodated in the slit 51. The first damper 81 is arranged in the first recess 53 and is attached to the arm 42.

[0116] The first damping member 81 is arranged in the first recess 53 so as to be further away from the magnetic disk 12U than when it is arranged in the first surface 42c. Therefore, the first damping member 81 can suppress contact with the magnetic disk 12U while attenuating the vibration of the arm 42. In addition, the first recess 53 provided in the arm 42 avoids the portion provided with the first seat surface 42d and the gap 51, and is extended to reach the first side surface 42a. Thus, it is possible to suppress the influence of the provision of the first recess 53 on the design and manufacture of the first seat surface 42d supporting the suspension 62 and the gap 51 accommodating a part of the suspension 62. That is, it is possible to suppress the situation where the first recess 53 hinders the installation of the suspension 62 to the first seat surface 42d and the gap 51. In addition, the first recess 53 can be easily formed, for example, by cutting the arm 42 from the first side surface 42a with the combined milling cutter 100. As described above, the HDD 10 of the present embodiment can improve the recording density by improving the positioning accuracy of the magnetic head 61 mounted on the suspension 62 , and can also be easily manufactured.

[0117] The arm 42 is provided with a second recess 54. The second recess 54 opens on the first side surface 42a and the second surface 42e, and is closer to the center axis Axd than the gap 51 in the direction perpendicular to the center axis Axd. For example, the arm 42 is cut from the first side surface 42a by the plurality of blades 101 of the combined milling cutter 100, and the first recess 53 and the second recess 54 are formed in each of the plurality of arms 42. In this case, the first recess 53 and the second recess 54 are formed on one arm 42 at the same time by two adjacent blades 101 of the combined milling cutter 100, so that the one arm 42 can be supported from both sides, and the bending of the one arm 42 can be restricted. Therefore, the HDD 10 of the present embodiment can easily form the first recess 53 and the second recess 54.

[0118] The second damper 82 is disposed in the second recess 54 and mounted on the arm 42 to damp vibration of the arm 42. Thus, the HDD 10 of this embodiment damps vibration of the arm 42 by the first damper 81 and the second damper 82, thereby further improving the positioning accuracy of the magnetic head 61 mounted on the suspension 62.

[0119] The edge 53b of the first recess 53 in the first surface 42c and the edge 54b of the second recess 54 in the second surface 42e are mirror-symmetrical to each other. Thus, for example, by cutting the arms 42 from the first surface 42c with a plurality of blades 101 having substantially the same shape, the first recess 53 and the second recess 54 can be formed on each of the plurality of arms 42. Therefore, the HDD 10 of the present embodiment can easily form the first recess 53 and the second recess 54.

[0120] In the Z direction along the central axis Axh, the thickness of the first damper 81 is smaller than the depth of the first recess 53. Thus, it is possible to suppress the first damper 81 from contacting the magnetic disk 12U.

[0121] The first damping member 81 includes a constraining layer 85 having a density greater than that of the arm 42, and a viscoelastic body 86 interposed between the constraining layer 85 and the arm 42. In the Z direction along the central axis Axh, the depth of the first recess 53 is three times the thickness of the constraining layer 85. For example, when the constraining layer 85 is made of stainless steel and the arm 42 is made of aluminum alloy, the density of the constraining layer 85 is about three times the density of the arm 42. Thus, the HDD 10 of the present embodiment can reduce the change in the mass of the arm 42 caused by providing the first recess 53 in the arm 42 and configuring the first damping member 81 in the first recess 53.

[0122] In the Z direction along the central axis Axh, the depth of the first recess 53 is greater than the distance between the first surface 42c and the first seat surface 42d. Therefore, regardless of the depth of the first recess 53, the arm 42 can maintain a desired thickness between the first seat surface 42d and the second seat surface 42f. Therefore, it is possible to suppress the influence of the provision of the first recess 53 on the design and manufacture of the first seat surface 42d supporting the suspension 62. That is, it is possible to suppress the situation where the first recess 53 hinders the installation of the suspension 62 on the first seat surface 42d.

[0123] The arm 42 is provided with a through hole 52 which opens at the first seat surface 42d and the second seat surface 42f. The suspension 62 is mounted on the arm 42 by being partially embedded in the through hole 52. In the projection diagram observed in the Z direction along the center axis Axh, the first damping member 81 is not line-symmetrical with respect to the center line L extending between the center axis Axh and the center of the through hole 52. Thus, the first recess 53 can be easily formed, for example, by cutting the arm 42 from the first side surface 42a with a combined milling cutter 100. In addition, the first damping member 81 is not restricted to a line-symmetrical shape. Therefore, the first damping member 81 can have a shape corresponding to other constraints or requirements in design or manufacturing, for example. Therefore, the HDD 10 of this embodiment can be easily manufactured.

[0124] The first recess 53 tapers toward the front end from the first side surface 42a toward the second side surface 42b. Thus, the first recess 53 can be easily formed by, for example, cutting the arm 42 from the first side surface 42a with the disk-shaped blade 101 of the combined milling cutter 100.

[0125] (Second embodiment)

[0126] Below, refer to Figure 7 and Figure 8 The second embodiment is described. In the following description of the multiple embodiments, the components having the same functions as the components already described are given the same reference numerals as the components already described, and the description is sometimes further omitted. In addition, the multiple components given the same reference numerals are not limited to having all the same functions and properties, and may also have different functions and properties according to each embodiment.

[0127] Figure 7 2 is an exemplary cross-sectional view showing the HSA 14 according to the second embodiment. Figure 7 As shown in FIG. 1 , the HSA 14 of the second embodiment omits the second damping member 82 . In addition, the HSA 14 of the second embodiment may include the second damping member 82 .

[0128] In the arm 42 of the second embodiment, the first recess 201 and the second recess 202 are provided instead of the first recess 53 and the second recess 54. The first recess 201 and the second recess 202 are substantially equivalent to the first recess 53 and the second recess 54 except for the following points.

[0129] In the Z direction along the central axis Axh, the depth of the first recess 201 is greater than the depth of the second recess 202. That is, in the Z direction along the central axis Axh, the depth of the first recess 201 is different from the depth of the second recess 202.

[0130] In the Z direction along the central axis Axh, the thickness of the first damper 81 is smaller than the depth of the first recess 201. On the other hand, in the Z direction, the thickness of the first damper 81 is larger than the depth of the second recess 202.

[0131] Figure 8 2 is an exemplary cross-sectional view showing the slide 35 and the combined milling cutter 100 according to the second embodiment. Figure 8 As shown, in the second embodiment, the center of the blade 101 in the Z direction is arranged at a position different from the center between two adjacent arms 42. Thus, two adjacent blades 101 can form deep first recesses 201 and shallow second recesses 202 in a plurality of arms 42 simultaneously.

[0132] Although the second recess 202 is shallow, the blade 101 contacts the arm 42 to form the second recess 202. Therefore, similarly to the first embodiment, the two blades 101 support one arm 42 from both sides, thereby restricting the elastic bending of the one arm 42.

[0133] In the HDD 10 of the second embodiment described above, the depth of the first recess 201 is different from the depth of the second recess 202 in the Z direction along the central axis Axh. Thus, the HDD 10 of this embodiment can easily adjust the distance between the first damper 81 and the magnetic disk 12U.

[0134] In the Z direction along the central axis Axh, the depth of the first recess 201 is greater than the depth of the second recess 202. Thus, the HDD 10 of the present embodiment can separate the first damping material 81 from the magnetic disk 12U, and can suppress the first damping material 81 from contacting the magnetic disk 12U.

[0135] In the Z direction along the central axis Axh, the thickness of the first damping member 81 is smaller than the depth of the first recess 201, and is larger than the depth of the second recess 202. Thus, it is possible to suppress the first damping member 81 from contacting the magnetic disk 12U. Furthermore, the first recess 201 in which the first damping member 81 is arranged is set to be deep, while the second recess 202 in which no damping member is arranged is set to be shallow. Thus, the HDD 10 of the present embodiment can suppress the arm 42 from becoming excessively thin due to the first recess 201 and the second recess 202.

[0136] (Third embodiment)

[0137] Below, refer to Fig. 9 A third embodiment will be described. Fig. 9 FIG. 1 is an exemplary cross-sectional view showing a portion of the HSA 14 according to the third embodiment. Fig. 9 As shown, the first damping member 81 of the third embodiment includes a constraining layer 301 instead of the constraining layer 85. The constraining layer 301 is substantially the same as the constraining layer 85 except for the following points. The constraining layer 301 of the third embodiment may replace the constraining layer 85 of either the first embodiment or the second embodiment.

[0138] The constrained layer 301 includes a first portion 305 and a second portion 306 that is thicker than the first portion 305. In a direction perpendicular to the central axis Axd, the first portion 305 is closer to the central axis Axd than the second portion 306 is.

[0139] For example, the first portion 305 is a portion of the constrained layer 301 that is closer to the central axis Axd than the central line L. The second portion 306 is a portion of the constrained layer 301 that is farther from the central axis Axd than the central line L. The first portion 305 and the second portion 306 are not limited to this example.

[0140] The constrained layer 301 is thinner toward the front end from the first side surface 42a toward the second side surface 42b, similarly to the first recess 53. Therefore, in the projection diagram observed in the Z direction along the central axis Axh, the area of ​​the first portion 305 is larger than the area of ​​the second portion 306. On the other hand, the second portion 306 is thicker than the first portion 305, and therefore, the weight of the first portion 305 and the weight of the second portion 306 are similar.

[0141] The first part 305 and the second part 306 are formed integrally. However, the first part 305 and the second part 306 may be independent of each other. In addition, the material of the first part 305 and the material of the second part 306 may be different.

[0142] In the HDD 10 of the third embodiment described above, the first damping member 81 includes the constraining layer 301 and the viscoelastic body 86 interposed between the constraining layer 301 and the arm 42. The constraining layer 301 includes the first portion 305 and the second portion 306 which is thicker than the first portion 305. Thus, the HDD 10 of this embodiment can adjust the weight balance in the asymmetrically shaped first damping member 81.

[0143] In the direction orthogonal to the center axis Axd, the first portion 305 is closer to the center axis Axd than the second portion 306. For example, when the disc-shaped blade 101 of the combined milling cutter 100 forms the first recess 53, the first recess 53 becomes thinner toward the front end from the first side surface 42a toward the second side surface 42b. That is, in the projection diagram observed in the Z direction along the center axis Axh, the second portion 306 is likely to become smaller than the first portion 305. However, the second portion 306 is thicker than the first portion 305, so the HDD 10 of this embodiment can adjust the weight balance in the first damping member 81.

[0144] Several embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their variations are included in the scope and gist of the invention, and are included in the invention described in the claims and their equivalents.

Claims

1. A disk device comprising a plurality of magnetic disks, a plurality of arms, a plurality of suspensions, and a plurality of first damping members, The plurality of magnetic disks are arranged along a first rotation axis and are rotatable around the first rotation axis. The plurality of arms are arranged along a second rotation axis separated from the first rotation axis, and can each enter a gap between two adjacent magnetic disks among the plurality of magnetic disks by rotating about the second rotation axis. Each of the plurality of arms has: a first side surface facing the first rotation axis; a second side surface, which is located on the opposite side of the first side surface and is provided with a gap; a first surface facing the first magnetic disk which is one of the two magnetic disks; a second surface facing the second magnetic disk which is the other of the two magnetic disks; a first seat surface facing the first magnetic disk, being farther from the first magnetic disk than the first surface, and being farther from the second rotation axis than the first surface; as well as a second seat surface facing the second magnetic disk, being farther from the second magnetic disk than the second surface, and being farther from the second rotation axis than the second surface, The plurality of arms are each provided with a first recess, the first recess opening on the first side surface and the first surface and being closer to the first rotation axis than the slit in a direction orthogonal to the first rotation axis, The plurality of suspensions are supported by the first seat surface or the second seat surface, respectively, and are partially accommodated in the gap and mounted on the plurality of arms. The plurality of first damping members are respectively disposed in the first recesses, attached to the plurality of arms, and configured to damp vibrations of the plurality of arms.

2. The disk device according to claim 1, The plurality of arms are each provided with a second recess, the second recess opening on the first side surface and the second surface and being closer to the first rotation axis than the slit in a direction perpendicular to the first rotation axis.

3. The disk device according to claim 2, The disk device further includes a plurality of second damping members, each of which is provided in the second recess, attached to the plurality of arms, and configured to attenuate vibration of the plurality of arms.

4. The disk device according to claim 2, In a direction along the second rotation axis, a depth of the first recess is different from a depth of the second recess.

5. The disk device according to claim 4, In the direction along the second rotation axis, a depth of the first recess is greater than a depth of the second recess.

6. The disk device according to claim 5, In the direction along the second rotation axis, the thickness of the first damper is smaller than the depth of the first recess and larger than the depth of the second recess.

7. The disk device according to claim 2, The edge of the first recess in the first surface and the edge of the second recess in the second surface are mirror-symmetrical to each other.

8. The disk device according to claim 1, In a direction along the second rotation axis, a thickness of the first damper is smaller than a depth of the first recess.

9. The disk device according to claim 1, Each of the plurality of first damping members includes a constraining layer having a density greater than that of the plurality of arms, and a viscoelastic body interposed between the constraining layer and one of the plurality of arms. In the direction along the second rotation axis, the depth of the first recess is three times the thickness of the constrained layer.

10. The disk device according to claim 1, In the direction along the second rotation axis, a depth of the first recess is greater than a distance between the first surface and the first seat surface.

11. The disk device according to claim 1, The plurality of arms are respectively provided with through holes opening on the first seat surface and the second seat surface. The plurality of suspensions are mounted on the plurality of arms by being partially embedded in the through holes, respectively. In a projection diagram viewed in a direction along the second rotation axis, each of the plurality of first damping members is not line-symmetrical with respect to an imaginary straight line extending between the second rotation axis and the center of the through hole.

12. The disk device according to claim 11, The first recess is tapered toward the front end from the first side surface toward the second side surface.

13. The disk device according to claim 11, Each of the plurality of first damping members comprises a constraining layer and a viscoelastic body interposed between the constraining layer and one of the plurality of arms. The constrained layer has a first portion and a second portion that is thicker than the first portion.

14. The disk device according to claim 13, In a direction perpendicular to the first rotation axis, the first portion is closer to the first rotation axis than the second portion.

15. A disk device comprising: A magnetic disk capable of rotating about a first rotation axis; an arm rotatable about a second rotation axis separated from the first rotation axis, having a mounting surface facing the disk and a seat surface facing the disk and farther from the second rotation axis than the mounting surface, and having a through hole opening in the seat surface; a suspension mounted to the arm by being supported by the seat surface and partially embedded in the through hole; as well as The damper is mounted on the mounting surface and is configured to damp vibration of the arm, and is not line-symmetrical with respect to an imaginary straight line extending between the second rotation axis and the center of the through hole in a projection viewed in the direction along the second rotation axis.

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