A base plate of a suspension for a disk device, a suspension for a disk device, and a disk device

Abstract

A suspension base plate of a disk device of an embodiment is a suspension base plate of a disk device connected to an arm provided on the disk device, and includes a plate body and a connecting portion provided on the plate body. The connecting portion includes a through-hole that penetrates the plate body in a thickness direction of the plate body, and a plurality of protrusions provided along an edge of the through-hole in a circumferential direction centered on a central axis of the through-hole. The plurality of protrusions and the through-hole form an inner peripheral surface, and the inner peripheral surface includes a plurality of protrusions formed between the plurality of protrusions and the recesses.

Description

[0001] Cross-reference (see relevant applications)

[0002] This application is based on an earlier application filed in Japan on January 11, 2022 (Japanese Patent Application No. 2022-002463), and enjoys priority and benefits associated with all matters described in that earlier application. Technical Field

[0003] This invention relates to a suspension base plate for a disk drive, a suspension for a disk drive, and a disk drive. Background Technology

[0004] Hard disk drives (HDDs) are used in information processing devices such as personal computers. A hard disk drive includes a disk that rotates around a spindle, a carriage that rotates around a pivot, and so on. The carriage has an actuator arm and rotates around the pivot in the direction of the disk's track width via a positioning motor, such as a voice coil motor.

[0005] The arm is equipped with a disk drive suspension (hereinafter referred to as the suspension). The suspension includes a load-bearing beam and a flexure superimposed on the load-bearing beam. A slider constituting a read / write head is provided on a universal joint formed near the front end of the flexure.

[0006] The slider has access elements (converters) for things like reading or writing data. These support beams, flexural elements, and sliders constitute the magnetic head universal joint assembly.

[0007] Various solutions have been proposed for the connection between the base plate and the arm (e.g., Japanese Patent No. 2736174, U.S. Patent Application Publication No. 2021 / 0264941, Japanese Patent Application Publication No. 02-049279, U.S. Patent No. 5187626, and U.S. Patent No. 5153794).

[0008] To increase the density of disk recordings, the head gimbal assembly needs to be made smaller and able to be positioned on the disk's recording surface with higher precision.

[0009] To increase recording density, there is a strong demand for increased recording capacity in hard disk drives, therefore it is recommended to increase the number of disks in the hard disk drive (i.e., multi-disk). To increase the number of disks, it is necessary not only to make the disks thinner, but also to reduce the distance between the disks.

[0010] To reduce the distance between disks, for example, the thickness of the arm can be reduced by lowering the height of the boss portion on the base plate. However, if the height of the boss portion is reduced, it becomes difficult to maintain the connection between the base plate and the arm. There is still room for improvement in the connection between the base plate and the arm. Summary of the Invention

[0011] One of the objectives of this invention is to provide a base plate for a disk drive with a suspension that enables thin-arm design, a suspension for the disk drive, and a disk drive.

[0012] According to one embodiment, a disk drive suspension base plate is a disk drive suspension base plate connected to an arm disposed on a disk drive, comprising a plate body and a connecting portion disposed on the plate body. The connecting portion includes a through hole penetrating the plate body in the thickness direction, a plurality of protrusions disposed along the edge of the through hole in a circumferential direction centered on the central axis of the through hole and inserted into mounting holes in the arm, and an inner circumferential surface formed by the plurality of protrusions and the through hole, the inner circumferential surface having a plurality of recesses formed between the plurality of protrusions.

[0013] In the circumferential direction, the plurality of protrusions may have a first length, and in the circumferential direction, the plurality of recesses may have a second length longer than the first length. Each of the plurality of protrusions may have a root connected to the plate body, an extension including an end located on the opposite side of the root in the thickness direction, and a pressing portion located between the root and the end and having a width greater than the root in a radial direction intersecting the thickness direction.

[0014] A disk drive suspension according to one embodiment includes a base plate of the disk drive suspension, a load-bearing beam connected to the base plate, and a flexural member arranged along the load-bearing beam.

[0015] The base plate includes a plate body and a connecting portion disposed in the plate body. The connecting portion includes a through hole penetrating the plate body in the thickness direction and a plurality of protrusions disposed along the edge of the through hole and inserted into the mounting hole of the arm in the circumferential direction centered on the central axis of the through hole. The plurality of protrusions intersect the central axis and do not overlap with a line parallel to the extension direction of the bearing beam.

[0016] According to one embodiment, a disk drive includes an arm and a first disk drive suspension and a second disk drive suspension. The arm includes a first mounting surface, a second mounting surface opposite to the first mounting surface, and a mounting hole penetrating the first mounting surface and the second mounting surface. The first disk drive suspension is connected to the arm from the first mounting surface, and the second disk drive suspension is connected to the arm from the second mounting surface.

[0017] The suspension connected to the arm from the first mounting surface side, the disk drive connected to the arm from the second mounting surface side, and the suspension for the second disk drive are all suspensions for disk drives.

[0018] Multiple protrusions on the first base plate of the first disk drive suspension and multiple protrusions on the second base plate of the second disk drive suspension are inserted into mounting holes. The multiple protrusions on the first base plate are inserted into the mounting holes and overlap with multiple recesses formed between the multiple protrusions on the second base plate. The height of the multiple protrusions may be greater than the thickness of the arm.

[0019] The arm can be made thinner by using a suspension base plate, a disk device suspension, and a disk device in this configuration. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the presently preferred embodiments of the invention and, together with the foregoing general description and the following detailed description of the preferred embodiments, illustrate the workings and help explain the nature of the invention.

[0021] Figure 1 This is a schematic perspective view representing an example of a disk drive.

[0022] Figure 2 It is a schematic cross-sectional view showing a portion of a disk device.

[0023] Figure 3 This is a schematic perspective view showing the suspension according to the first embodiment.

[0024] Figure 4 This is viewed from the slider side. Figure 3 A schematic perspective view of a portion of the front end of the suspension shown.

[0025] Figure 5 yes Figure 4 A plan view of the base plate shown.

[0026] Figure 6 This is a diagram used to illustrate the case of stacking the base plate of the first embodiment.

[0027] Figure 7 for Figure 6 A cross-sectional view of the midsole plate along line VII-VII.

[0028] Figure 8 yes Figure 7 A partially enlarged schematic diagram of section VIII.

[0029] Figure 9 yes Figure 8 A schematic partial sectional view of the suspension and arms.

[0030] Figure 10 yes Figure 9 A partially enlarged schematic diagram of section X.

[0031] Figure 11This is a comparative example of the base plate of the first embodiment.

[0032] Figure 12 It is shown Figure 11 A schematic partial cross-sectional view of the suspension and arms shown.

[0033] Figure 13 yes Figure 12 A magnified view of part XIII.

[0034] Figure 14 This is a schematic partial cross-sectional view showing the base plate and arm of the second embodiment.

[0035] Figure 15 This is a schematic partial cross-sectional view showing the base plate and arm of the third embodiment.

[0036] Figure 16 This is a schematic top view of the base plate of the fourth embodiment.

[0037] Figure 17 This is a diagram illustrating the case where the base plates of the fourth embodiment are overlapped.

[0038] Figure 18 This is a schematic cross-sectional view of the base plate of the fifth embodiment.

[0039] Figure 19 This is a schematic top view showing the base plate of the sixth embodiment.

[0040] Figure 20 This is a schematic top view showing the base plate of the seventh embodiment. Detailed Implementation

[0041] [First Embodiment]

[0042] Figure 1 This is a schematic perspective view showing an example of a hard disk drive (HDD) 1. Figure 1 In the example shown, the disk drive 1 includes a housing 2, a plurality of disks (hereinafter referred to as disks 4) that rotate around a spindle 3, and a bracket 6 that can rotate around a pivot 5, and a positioning motor (voice coil motor) 7 for driving the bracket 6. The housing 2 is sealed with a cover (not shown).

[0043] Figure 2 This is a schematic cross-sectional view showing a portion of disk device 1. For example... Figure 1 and Figure 2 As shown, the bracket 6 is provided with multiple (e.g., 3) arms 8. Arms 8 may be referred to as support arms, HSA arms, etc. Arms 8 are made of metal materials such as aluminum alloy. The number of arms 8 provided on the bracket 6 is not limited to the example above.

[0044] The suspension 10 is attached to the ends of a plurality of arms 8. The slider 11 constituting the magnetic head is disposed at the end of each suspension 10.

[0045] When disk 4 rotates at high speed, air flows between disk 4 and slider 11, forming an air bearing. When bracket 6 rotates via positioning motor 7, suspension 10 moves radially along disk 4, thereby moving slider 11 to the desired track on disk 4.

[0046] like Figure 2 As shown, disk 4 has a first disk 4A and a second disk 4B. The first disk 4A and the second disk 4B are opposite each other with a predetermined gap. A plurality of suspensions 10 provided in disk device 1 include a first suspension 10A and a second suspension 10B.

[0047] The first suspension 10A and the second suspension 10B are mounted on the arm 8 located at the center of the thickness direction of the housing 2 among a plurality of arms 8. The first suspension 10A and the second suspension 10B have a common basic structure.

[0048] The first suspension 10A and the second suspension 10B are located between the first disk 4A and the second disk 4B. The first suspension 10A and the second suspension 10B are opposite each other in the thickness direction of the housing 2. The number of disks 4 is not limited to two, but can also be three or more. The number of suspensions 10 varies appropriately depending on the number of disks 4.

[0049] Figure 3 This is a schematic perspective view of the suspension 10 according to the first embodiment. Figure 4 Viewed from the side of slider 11 Figure 3 A schematic perspective view of a portion of the front end side of the suspension 10 is shown. The suspension 10 includes a component connected to the arm 8 ( Figure 2 The base plate 20, the load-bearing beam 31, and the flexural member 32 (as shown in the diagram).

[0050] The base plate 20, the load-bearing beam 31, and the flexure 32 all extend in the longitudinal direction of the suspension 10. The longitudinal direction of the suspension 10, the base plate 20, the load-bearing beam 31, and the flexure 32 is defined hereinafter as longitudinal direction X.

[0051] The direction perpendicular to the longitudinal direction X is defined as the lateral direction Y of the suspension 10, the base plate 20, the load-bearing beam 31, the flexure 32, etc. Since the suspension 10, the base plate 20, the load-bearing beam 31, and the flexure 32 extend in the longitudinal direction X, the longitudinal direction X corresponds to the direction of extension.

[0052] The direction intersecting (e.g., perpendicular to) the longitudinal direction X and the transverse direction Y is defined as the thickness direction Z of the suspension 10, base plate 20, load-bearing beam 31, flexure 32, etc. The thickness direction of the housing 2 corresponds to the thickness direction Z. Furthermore, as indicated by the arc arrow, the sway direction S is defined near the tip of the load-bearing beam 31.

[0053] The base plate 20 is made of a metal material such as stainless steel. The thickness of the base plate 20 is, for example, less than 100 μm, and in some cases, 50 μm. For example, the thickness of the base plate 20 is greater than the thickness of the load-bearing beam 31 and the flexural member 32.

[0054] The base plate 20 includes a plate body 21 and a connecting portion 40 disposed on the plate body 21. The connecting portion 40 has a through hole 41, a plurality of (e.g., two) protrusions 42, and an inner peripheral surface 43. Figure 3 In the example shown, the through hole 41 is formed, for example, at a position away from the front end in the length direction X (right side of the figure).

[0055] The load-bearing beam 31 is made of a metallic material such as stainless steel. The thickness of the load-bearing beam 31 is, for example, 30-80 μm. The load-bearing beam 31 has a shape that tapers gradually towards its tip.

[0056] The load-bearing beam 31 is connected to the base plate 20, for example, by laser spot welding. The load-bearing beam 31 is elastically supported by the base plate 20. A flexural member 32 is arranged along the base plate 20 and the load-bearing beam 31. The flexural member 32 is fixed to the base plate 20 and the load-bearing beam 31, for example, by laser spot welding.

[0057] The flexural member 32 has a metal base 33 made of a thin stainless steel sheet and a wiring portion 34 arranged along the metal base 33. The thickness of the metal base 33 is less than the thickness of the load-bearing beam 31.

[0058] The thickness of the metal base 33 is, for example, 12 to 25 μm, and in one example, 20 μm. A portion of the wiring section 34 is electrically connected to the components of the slider 11 via terminals.

[0059] like Figure 4 As shown, the flexural element 32 also has a tongue 36 and a pair of cantilever beams 37 at its distal end 35. A slider 11 is mounted on the tongue 36. An element capable of converting magnetic and electrical signals, such as an MR element, is disposed at the tip of the slider 11.

[0060] In the distal end 35, the wiring section 34 is electrically connected to the components of the slider 11 via terminals. These elements are used to access the disk 4, such as writing or reading data. The slider 11, the support beam 31, the flexure 32, etc., constitute the head universal joint assembly.

[0061] The pair of cantilever beams 37 are respectively arranged on both sides of the tongue 36 along the transverse Y direction. The pair of cantilever beams 37 are shaped to protrude from both sides of the tongue 36 in the transverse Y direction. Both the tongue 36 and the pair of cantilever beams 37 are part of the metal base 33 and are formed, for example, by etching.

[0062] The universal joint portion 38 is composed of a tongue 36, a pair of cantilever beams 37, etc. The universal joint portion 38 is formed in the distal end 35 of the flexural member 32. A micro-actuator element 39 is mounted on the universal joint portion 38. The micro-actuator element 39 has the function of rotating the tongue 36 along the swing direction S, as shown in the figure.

[0063] Microactuator elements 39 are arranged on both sides of slider 11 along the transverse Y direction. Microactuator elements 39 are made of piezoelectric materials such as lead zirconate titanate (PZT). Each microactuator element 39 is fixed to the actuator support portion of tongue 36 by conductive adhesive or the like.

[0064] Next, use Figures 5-8 The base plate 20 will be described.

[0065] Figure 5 yes Figure 4 A plan view of the base plate 20 is shown. Figure 6 This is a diagram used to illustrate the case of the base plate 20 of the first embodiment being stacked. Figure 7 For the base plate 20 edge Figure 6 Schematic diagram of the cross section of line VII-VII. Figure 8 yes Figure 7 A partially enlarged schematic diagram of section VIII. As described above, the base plate 20 includes a plate body 21 and a connecting portion 40.

[0066] The plate body 21 is formed in a flat plate shape. As an example, the longitudinal length X of the plate body 21 is greater than the transverse length Y. The plate body 21 has a first surface 22 and a second surface 23 opposite to the first surface 22 in the thickness direction Z. As an example, the first surface 22 is the surface facing the arm 8 to which the base plate 20 is connected.

[0067] The connecting portion 40 has a through hole 41, a plurality of protrusions 42, and an inner peripheral surface 43 formed by the through hole 41 and the plurality of protrusions 42. The inner peripheral surface 43 has a plurality of (e.g., two) recesses 44. The connecting portion 40 is formed, for example, by embossing using a die assembly.

[0068] The through hole 41 penetrates the first surface 22 and the second surface 23 in the thickness direction Z. Figure 5 In the example shown, the through hole 41 is formed, for example, at approximately the center of the width direction Y of the plate body 21. From another angle, the center of the through hole 41 is equidistant from a pair of edges arranged along the transverse Y direction of the plate body 21.

[0069] exist Figure 5In the following figures, the line passing through the center of the through hole 41 will be designated as the central axis AX. The central axis AX extends in a direction parallel to the thickness direction Z. Here, the radial direction R is defined as the direction away from the central axis AX centered on it, and the circumferential direction θ around the central axis AX is defined. The radial direction R is a direction that intersects (e.g., is perpendicular to) the thickness direction Z.

[0070] like Figure 5 As shown, line LX intersects the central axis AX of the through hole 41 and is parallel to the length direction X, line LY intersects the central axis AX of the through hole 41 and is parallel to the transverse direction Y, and... Figure 5 In the example shown, line LX is located approximately at the center of the left-right direction Y of the plate body 21.

[0071] Multiple protrusions 42 are inserted into the mounting holes 83 of the arm 8 (e.g.) Figure 2 (As shown). Multiple protrusions 42 are arranged along the edge 411 of the through hole 41 in the circumferential direction θ. Multiple discontinuous protrusions 42 are formed on the inner circumferential surface 43 in the circumferential direction θ. Multiple protrusions 42 are symmetrical about the central axis point AX. Multiple protrusions 42 have the same shape.

[0072] like Figure 5 As shown, on the inner circumferential surface 43, a plurality of protrusions 42 project toward the central axis AX. A plurality of recesses 44 are formed in the circumferential direction θ between the plurality of protrusions 42. From another angle, the plurality of recesses are portions of the inner circumferential surface 43 that are recessed radially outward from the plurality of protrusions 42.

[0073] exist Figure 5 In the example shown, the multiple protrusions 42 do not overlap with lines LX and LY. Each of the multiple protrusions 42 has a first length L1. Here, the first length L1 is the length of the protrusion 42 along the circumferential direction θ.

[0074] Each of the plurality of recesses 44 has a second length L2. Here, the second length L2 is the length of the recess 44 along the circumferential direction θ. The second length L2 corresponds to the spacing between protrusions 42 that face each other in the circumferential direction θ. Figure 5 In the example shown, the second length L2 is longer than the first length L1.

[0075] From another perspective, the angle θ in the circumferential direction of the area formed by the protrusion 42 on the inner circumferential surface 43 is less than the angle obtained by dividing 360 degrees by twice the number of protrusions 42. For example, the circumferential angle θ of the area forming one protrusion 42 is less than 90 degrees. The circumferential angle θ of the areas forming each protrusion 42 is, for example, equal.

[0076] exist Figure 6 In this configuration, one base plate 20 overlaps with another base plate 20, which is rotated 180 degrees from the winding LX. Figure 6In the diagram, the other base plate 20 is indicated by a dashed line. In this case, in the thickness direction Z, the first surface 22 of one base plate 20 faces the first surface 22 of the other base plate 20.

[0077] When the pair of base plates 20 are stacked as described above, a plurality of protrusions 42 of one base plate 20 overlap with a plurality of recesses 44 of the other base plate 20, and a plurality of recesses 44 of the other base plate 20 overlap with a plurality of recesses 44 of one base plate 20. The plurality of protrusions 42 of one base plate 20 do not overlap with the plurality of protrusions 42 of the other base plate 20. The protrusions 42 of one base plate 20 and the protrusions 42 of the other base plate 20 are arranged alternately in the circumferential direction θ.

[0078] like Figure 6 As shown, between the protrusions 42 of one base plate 20 and the protrusions 42 of another base plate 20 in the circumferential direction θ, there are gaps GP1 and a that overlap with line LX, respectively forming gaps GP2 that overlap with line LY.

[0079] exist Figure 6 In the example shown, the circumferential length θ of gap GP1 is approximately equal to the circumferential length θ of gap GP2. By arranging the plurality of protrusions 42 as described above, the plurality of recesses 44 of another base plate 20 can overlap with the recesses 44 that are rotated 180 degrees around line LX relative to the plurality of protrusions 42 of the other base plate 20.

[0080] Next, protrusion 42 will be explained.

[0081] like Figure 7 and Figure 8 As shown, the protrusion 42 protrudes from the second surface 23 toward the first surface 22 in the thickness direction Z. The protrusion 42 has a root portion 51 connected to the plate body 21 and an extension portion 52 connected to the root portion 51 and extending from the plate body 21 in the thickness direction Z.

[0082] For example, the root portion 51 corresponds to the region between the first surface 22 and the second surface 23 in the thickness direction Z, and the extension portion 52 corresponds to the region other than the root portion 51. Figure 7 and Figure 8 In the example shown, extension 52 corresponds to the area extending from the first face 22 upwards in the figure.

[0083] The protrusion 42 has an outer surface 53 positioned radially outward, an inner surface 54 positioned radially inward (R), and an end face 55 connecting the inner surface 54 and the outer surface 53. The outer surface 53 is formed on the extension 52 and connected to the first surface 22.

[0084] exist Figure 7 and 8In the example shown, the outer surface 53 extends parallel to the central axis AX. Here, "parallel" includes the case of a slight inclination. The angle between the outer surface 53 and the first surface 22 is, for example, 90 degrees.

[0085] End face 55 is located on the side opposite to the root 51 in the thickness direction Z. End face 55 corresponds to one end of the extension 52. Figure 7 and Figure 8 In the example shown, end face 55 is a face that is approximately parallel to the radial direction R.

[0086] The inner surface 54 forms part of the inner peripheral surface 43 of the connecting portion 40. The inner surface 54 is formed on the root portion 51 and the extension portion 52. The inner surface 54 includes a back hole surface 61, an inclined surface 62, a pressing surface 63, and an inclined surface 64. The back hole surface 61, the inclined surface 62, the pressing surface 63, and the inclined surface 64 are arranged sequentially from the second surface 23 side in the thickness direction Z.

[0087] The back hole surface 61 is located at the root 51 and is connected to the second surface 23. The back hole surface 61 extends parallel to the central axis AX. The pressing surface 63 is located on the extension 52. The pressing surface 63 extends parallel to the central axis AX. The pressing surface 63 is parallel to the outer surface 53. As an example, the length of the pressing surface 63 in the thickness direction Z is greater than the length of the back hole surface 61 in the thickness direction Z.

[0088] like Figure 7 and Figure 8 As shown, in the radial direction R, the pressing surface 63 is located closer to the central axis AX than the back hole surface 61, the inclined surface 62, and the inclined surface 64. From another perspective, the length from the central axis AX of the radial direction R to the pressing surface 63 is the same as the length from the central axis AX of the radial direction R to the back hole surface 61, the inclined surface 62, and the pressing surface 63. The inclined surface 64 is the longest in the inner surface 54, extending radially from the central axis AX to the back hole surface 61.

[0089] An inclined surface 62 is formed from the root 51 to the extension 52, connecting the back hole surface 61 and the pressing surface 63. In the thickness direction Z, the inclined surface 62 is inclined from the back hole surface 61 toward the pressing surface 63 in a manner close to the central axis AX.

[0090] An inclined surface 64 is located on the extension 52 and connects the pressing surface 63 and the end face 55. In the thickness direction Z, the inclined surface 64 is inclined from the pressing surface 63 toward the end face 55 away from the central axis AX. As an example, the length of the inclined surface 62 in the thickness direction Z is greater than the length of the inclined surface 64 in the thickness direction Z.

[0091] The protrusion 42 also has a pressing portion 56. In the thickness direction Z, the pressing portion 56 is located between the root portion 51 and the end face 55. In the radial direction R, the pressing portion 56 is located inside the protrusion 42.

[0092] The pressing portion 56 is, for example, the area of ​​the extension 52 that includes the pressing surface 63. The protrusion 42 has its widest width at the pressing portion 56. The width is the length of the protrusion 42 along the radial direction R. Here, the radial width R of the pressing portion 56 is set as width W1, and the radial width R of the root portion 51 is set as width W2.

[0093] The radial width W1 of the pressing portion 56 is, for example, the length from the pressing surface 63 to the outer surface 53 of the radial R. The radial width W2 of the root portion 51 is the length from the back hole surface 61 to the inner peripheral surface 43 forming the recess 44. The radial width W1 of the pressing portion 56 is greater than the radial width W2 of the root portion 51.

[0094] Figure 9 yes Figure 8 A schematic partial cross-sectional view of the suspension 10 and arm 8. Figure 10 yes Figure 9 A partially enlarged schematic diagram of section X. Figure 9 and 10 A portion of arm 8 and the first suspension 10A and the second suspension 10B connected to arm 8 are shown. Figure 10 The illustration of the load-bearing beam 31 is omitted in the text.

[0095] The arm 8 has a first mounting surface 81, a second mounting surface 82 opposite to the first mounting surface 81, and a mounting hole 83 extending through the first mounting surface 81 and the second mounting surface 82 in the thickness direction Z. The mounting hole 83 is provided on the front end side of the arm 8. The mounting hole 83 is circular, for example, in a plan view. The mounting hole 83 has an inner circumferential surface 84.

[0096] The first suspension 10A has a base plate 20A, and the second suspension 10B has a base plate 20B. Base plate 20A corresponds to the first base plate, and base plate 20B corresponds to the second base plate.

[0097] Base plates 20A and 20B have the same shape as base plate 20 described above. For example... Figure 9 and 10 As shown, base plates 20A and 20B are connected to arm 8 such that the first surface 22 faces each other, as shown in the reference. Figure 1 As described.

[0098] like Figure 9 and Figure 10 As shown, the first suspension 10A is connected to the arm 8 from the first mounting surface 81 side, and the second suspension 10B is connected to the arm 8 from the second mounting surface 82 side. The base plates 20A and 20B are connected to the arm 8 via mounting holes 83, respectively. In this case, the central axis AX of the through hole 41 coincides with the central axis AX of the mounting hole 83.

[0099] The first surface 22 of base plate 20A contacts the first mounting surface 81, and the first surface 22 of base plate 20B contacts the second mounting surface 82. Multiple protrusions 42 of base plates 20A and 20B are respectively inserted into mounting holes 83. In the mounting holes 83, the protrusions 42 of base plate 20A and base plate 20B are arranged alternately along the circumferential direction θ, as shown in the reference. Figure 2 As stated above.

[0100] like Figure 9 and Figure 10 As shown, in the thickness direction Z, multiple protrusions 42 of the base plate 20A overlap with multiple recesses 44 of the base plate 20B, and multiple recesses 44 of the base plate 20A overlap with multiple protrusions 42 of the base plate 20B. The outer surface 53 contacts the inner peripheral surface 84.

[0101] exist Figure 10 In this diagram, the thickness of arm 8 is represented by thickness T8, and the height of protrusion 42 is represented by height H4. Here, the height H4 of protrusion 42 is the length along the thickness direction Z from the first surface 22 to the end face 55. The thickness T8 of arm 8 is the length along the thickness direction Z from the first mounting surface 81 to the second mounting surface 82. Figure 10 In the example shown, the height H4 of the protrusion 42 is approximately equal to the thickness T8 of the arm 8. From another angle, the end face 55 is on the same plane as the second mounting surface 82 in the thickness direction.

[0102] The pressing surface 63 overlaps with the inner peripheral surface 84 in the radial direction R. The pressing part 56 is configured such that the center of the thickness direction Z of the pressing surface 63 coincides with the center of the thickness direction Z of the inner peripheral surface 84 in the radial direction R.

[0103] exist Figure 10 In the diagram, line LC is a line parallel to the radial direction R, equidistant from the first mounting surface 81 and the second mounting surface 82, along the thickness direction Z. Figure 10 In the example shown, the center of the thickness direction Z of the pressing surface 63 intersects the line LC.

[0104] When the base plate 20 is connected to the arm 8, multiple protrusions 42 are pushed outward radially R as shown by the arrows in the figure, with the inner circumferential surface 84 and the outer surface 53 in close contact with each other. The multiple protrusions 42 are plastically deformed outward in the radial direction R.

[0105] When multiple protrusions 42 are inserted into the mounting holes 83, for example, by passing the ball through the mounting holes 83 of the arm 8 in the thickness direction Z, the multiple protrusions 42 are pushed outward in the radial direction R by the pressing part 56.

[0106] The ball is made of a metal that is harder than the metal forming the base plate 20. The ball is made of, for example, stainless steel. The diameter of the ball is larger than the inner diameter of the inner circumferential surface formed by the pressing surface 63. This type of connection between parts is sometimes referred to as press-fitting, forging, etc.

[0107] By passing the ball through the mounting hole 83 along the thickness direction Z, the plurality of protrusions 42 extend outward along the radial direction R. As a result, the outer surface 53 and the inner circumferential surface 84 are in close contact with each other, and the base plate 20 is fixed to the arm 8. See reference Figure 10 The forming of the compression portion 56 maximizes the force in the radial direction R outward when the ball passes through the compression portion 56.

[0108] Inclined surfaces 62 and 64, connected to the pressing surface 63, serve as guides for transmitting the ball towards the pressing surface 63. Therefore, the resistance to the ball passing through the mounting hole 83 is reduced, allowing the ball to pass through the mounting hole 83 more easily in the thickness direction Z. From another perspective, the load on the ball in the thickness direction Z as it passes through the mounting hole 83 can be reduced. This load is sometimes referred to as the pressing force.

[0109] Figure 11 This is a comparative example of the base plate 20 of the first embodiment. Figure 12 It is shown Figure 11 A schematic partial cross-sectional view of the suspension 100 and arm 80 shown. Figure 13 yes Figure 12 A partially enlarged schematic diagram of section XIII.

[0110] like Figure 11 As shown, the suspension 100 has a base plate 200. The connecting portion 40 of the base plate 200 has a through hole 41 and a cylindrical boss 45. The boss 45 is provided along the edge of the through hole 41. The height of the boss 45 in the thickness direction is approximately equal to the height H4 of the protrusion.

[0111] like Figure 12 and 13 As shown, the first suspension 100A has a base plate 200A, and the second suspension 100B has a base plate 200B. The base plates 200A and 200B have the same shape as the aforementioned base plate 200.

[0112] exist Figure 12 and Figure 13 In the example shown, the first suspension 100A is connected to the arm 80 from the first mounting surface 81 side, and the second suspension 100B is connected to the arm 80 from the second mounting surface 82 side.

[0113] The bosses 45 of base plate 200A and base plate 200B are respectively inserted into the mounting holes 83. The outer surface 530 of the bosses 45 contacts the inner circumferential surface 84. The bosses 45 of base plate 200A overlap with the bosses 45 of base plate 200B in the thickness direction Z. A gap is formed between the bosses 45 of base plate 200A and the bosses 45 of base plate 200B in the thickness direction Z.

[0114] Therefore, arm 80 needs to have a predetermined thickness to connect the first suspension 100A and the second suspension 100B. Figure 13 The thickness T80 of the arm 80 shown is greater than Figure 10 The thickness T8 of arm 8 is shown. For example, if the height of boss 45 is approximately equal to the height H4 of protrusion 42, then the thickness T80 of arm 80 needs to be twice or more than the thickness T8 of arm 8.

[0115] The boss 45 has a pressing portion 560 formed along the circumferential direction θ on the inner side of the radial direction R. The pressing portion 560 is provided with a pressing surface 630. Each pressing surface 630 is arranged along the thickness direction Z. In the radial direction R, the pressing surface 630 overlaps with the inner circumferential surface 84.

[0116] As described above, a gap is formed between the bosses 45 in the thickness direction Z. Figure 13 As shown, from the angle of the mounting hole 83, the center of the thickness direction Z of the inner circumferential surface 84 does not coincide with the pressing surface 630 of the radial R.

[0117] In the base plate 20 constructed as described above, the connecting portion 40 has a through hole 41, a plurality of protrusions 42, and a plurality of recesses 44 formed between the plurality of protrusions 42. In the case of the base plate 20, when a pair of base plates 20 are connected to the arm 8, the plurality of protrusions 42 of one base plate 20 overlap with the plurality of recesses 44 of the other base plate 20, and the plurality of protrusions 42 of the other base plate 20 may overlap with the plurality of recesses 44 in one of the base plates 20.

[0118] From another perspective, the multiple protrusions 42 of one base plate 20 do not overlap with the multiple protrusions 42 of another base plate 20. As a result, the thickness T8 of the arm 8 connecting the base plate 20 can be reduced, and the thickness of the arm 8 can also be reduced.

[0119] By using a suspension 10 with such a base plate 20, the thickness T8 of the arm 8 can be reduced. This allows for miniaturization of the bracket 6 with the arm 8. Consequently, the thickness of the disk drive 1 can be reduced, and the thickness of the disk drive 1 can be decreased.

[0120] By reducing the thickness T8 of the arms 8, the distance between the disks 4 can be reduced, and the disks 4 can be housed within the housing 2. Furthermore, since more arms 8 can be provided for the bracket 6 having the same height as a conventional housing, more disks 4 can be provided for the housing 2, which is identical to a conventional housing.

[0121] Reference Figures 11 to 13 Compared to the base plate 200, the base plate 20 reduces the thickness T8 of the arm 8 without making the height H4 of the protrusion 42 less than the height of the boss 45.

[0122] Although the thickness T8 of arm 8 is reduced, the contact length between the outer surface 53 and the inner peripheral surface 84 in the thickness direction Z is the same as the contact length between the boss 45 and the inner surface. Therefore, the base plate 20 can be reliably connected to arm 8.

[0123] Because the multiple protrusions 42 are formed discontinuously in the circumferential direction θ, they can be easily pushed outwards radially R. (Refer to reference) Figures 11 to 13 Compared to the base plate 200 described, the base plate 20 does not require additional load on the ball in the thickness direction Z when the ball passes through the mounting hole 83. Therefore, it is easy to connect the base plate 20 and the arm 8.

[0124] By reducing the load acting on the ball in the thickness direction Z, the effects on the base plate 20 (e.g., deformation) when connecting the base plate 20 to the arm 8 can be suppressed. Thus, the influence of the base plate 20 on the characteristics of the suspension 10 can be suppressed.

[0125] During the inspection after the disk device 1 is assembled, if a defective head is found, the head suspension assembly is reassembled to replace the defective head. In this case, the base plate needs to be removed from the arm.

[0126] For example, suppose a pair of base plates with bosses are attached to an arm. When the outer surface of the boss on one base plate and the inner surface of the boss on the other base plate overlap in the mounting holes of the base plates in the radial direction R, the respective bosses undergo plastic deformation radially outward in the R direction (interlocking). When the base plates are interlocked to the arm, it is difficult to remove the base plates from the arm, making it difficult to replace the gimbal universal joint assembly.

[0127] Compared to the case where the base plate is interlocked to the arm, in the case of base plate 20, the inner peripheral surfaces 84 and outer surfaces 53 of the multiple protrusions 42 are in close contact to connect the arm base plate 20 and the arm 8., and base plate 20 can be easily removed from the arm 8. Therefore, during the post-assembly inspection of the disk drive 1, it is possible to easily reassemble only the head suspension assembly containing defective heads.

[0128] That is, the base plate 20 according to this embodiment can reliably connect the base plate 20 and the arm 8, and can provide a base plate 20, suspension 10 and disk device 1 with excellent workability.

[0129] In the base plate 20, the recess 44 has a second length L2 that is longer than the first length L1 of the protrusion 42. When a pair of base plates 20 are referenced Figure 6 When the overlap occurs, gaps GP1 and GP2 are formed between adjacent protrusions 42.

[0130] Therefore, the plurality of protrusions 42 of one base plate 20 can easily overlap with the plurality of recesses 44 of another base plate 20, and a pair of suspensions 10 can easily be connected to the arms 8.

[0131] By arranging multiple protrusions 42 as in this embodiment, multiple recesses 44 of another base plate 20 after being rotated 180 degrees around LX can overlap the multiple protrusions 42 of the other base plate 20.

[0132] As a result, the same base plate 20 can be used as the base plate 20 for suspensions 10 facing each other across arms 8, similar to the first suspension 10A and the second suspension 10B1.

[0133] like Figure 10 As shown, the pressing part 56 is configured such that the center of the pressing surface 63 in the thickness direction Z coincides with the center of the inner peripheral surface 84 in the thickness direction Z in the radial direction R. Therefore, when the ball passes through the mounting hole 83 in the thickness direction Z, the inner peripheral surface 84 can be pressed from the outer surface 53 to include the center of the inner peripheral surface 84 in the thickness direction Z. As a result, the outer surface 53 and the inner peripheral surface 84 can be stably and tightly contacted, and the base plate 20 can be reliably connected to the arm 8.

[0134] As described above, by pressing the inner peripheral surface 84 from the outer surface 53 by the pressing part 56, the deviation of the load in the thickness direction Z of the arm 8 can be suppressed. As a result, the deformation of the arm 8 (e.g., warping of the arm 8) that occurs when the base plate 20 is connected to the arm 8 can be suppressed.

[0135] According to this embodiment, a base plate 20, a suspension 10, and a disk drive 1 that enable the arm 8 to be thinner can be provided. In addition to those mentioned above, this embodiment provides various advantageous effects.

[0136] Next, another embodiment will be described. In other embodiments and variations described below, the same reference numerals are used to denote the same components as in the first embodiment, and their detailed descriptions are omitted or simplified. The base plate 20 of the following embodiments can be applied to the suspension 10 to construct a disk drive 1 equipped with the suspension 10.

[0137] [Second Embodiment]

[0138] Figure 14 This is a schematic partial cross-sectional view showing the base plate 20 and arm 8 of the second embodiment. (See attached image.) Figure 14 As shown, the extension 52 has a claw portion 57. The claw portion 57 is the area that protrudes from the mounting hole 83 when the protrusion 42 is inserted into the mounting hole 83. The end face 55 is located on the claw portion 57. From the perspective of the arm 8, the height H4 of the protrusion 42 is greater than the thickness T8 of the arm 8.

[0139] The height H4 of protrusion 42 is greater than the height of the protrusion. Figure 1 The height H4 of the protrusion 42 in the first embodiment described herein. The gap GP3 is formed radially R between the outer surface 53 and the inner circumferential surface 43. Figure 14In the example shown, the center of the thickness direction Z of the pressing surface 63 in the radial direction R overlaps with the center of the thickness direction Z of the inner peripheral surface 84.

[0140] The same effect as in the first embodiment can be achieved using the construction of the base plate 20 in the second embodiment. In the base plate 20 of the second embodiment, when the ball passes through the mounting hole 83 along the thickness direction Z, a portion of the claw 57 deforms to fall toward the gap GP3. When a portion of the claw 57 deforms, the deformed portion is located in the gap GP3. Therefore, the deformed portion overlaps with the arm 8 in the thickness direction Z.

[0141] This makes it difficult for the base plate 20 to detach from the arm 8 in the thickness direction Z due to deformation. With the base plate 20 of the second embodiment, the base plate 20 can be more firmly attached to the arm 8 compared to the first embodiment.

[0142] [Embodiment 3]

[0143] Figure 15 This is a schematic partial cross-sectional view showing the base plate 20 and arm 8 of the third embodiment. The inner surface 54 has a back hole surface 61 and a parallel surface 65. The back hole surface 61 is located at the root 51 and is connected to the second surface 23. Figure 15 In the example shown, the back hole surface 61 is arc-shaped. A parallel surface 65 connecting the back hole surface 61 and the end face 55 is formed from the root 51 to the extension 52.

[0144] Parallel surface 65 is a plane that is substantially parallel to outer surface 53. Parallel surface 65 extends substantially parallel to the central axis AX. Parallel surface 65 includes a region corresponding to the pressing surface 63 of the first embodiment. Extension 52 has claw portion 57. Gap GP3 is formed between outer surface 53 and inner peripheral surface 84. Protrusion 42 of the third embodiment is formed, for example, by a flange.

[0145] Similarly, in the construction of the base plate 20 in the third embodiment, effects similar to those in the above embodiments can be obtained. Since the protrusion 42 can be formed by flanging, the base plate 20 can be manufactured at a lower cost than embossing. More specifically, the cost of the mold used to manufacture the base plate 20 can be reduced. Furthermore, the extension 52 has a claw portion 57, but it may also lack the claw portion 57.

[0146] [Example 4]

[0147] Figure 16 This is a schematic top view of the base plate 20 in the fourth embodiment. Figure 17 This diagram illustrates the case of the base plate 20 in the fourth embodiment of the stacking. (See diagram below.) Figure 16 As shown, the connecting portion 40 of the base plate 20 has a plurality of (e.g., two) protrusions 42. In Figure 16In the example shown, the multiple protrusions 42 do not overlap with the lines LX and LY.

[0148] The first length L1 of the multiple protrusions 42 is approximately equal to the second length L2 of the multiple recesses 44. From another perspective, Figure 16 The first length L1 of the plurality of protrusions 42 shown is greater than that of the protrusions 42 used. Figure 5 The first length L1 of the multiple protrusions 42 described is [length]. Figure 16 The second length L2 of the plurality of recesses 44 shown is greater than that of the used Figure 5 The second length L2 of the multiple recesses 44 described is short.

[0149] In this embodiment, the circumferential angle θ of the formation range of the protrusion 42 is approximately equal to the angle obtained by dividing 360 degrees by twice the number of protrusions 42. Figure 16 In the example shown, the circumferential angle θ forming the area with a protrusion 42 is approximately 90 degrees.

[0150] exist Figure 17 In the middle, another base plate 20, rotated 180 degrees by the winding LX, is superimposed on the first base plate 20. Figure 17 In the middle, the other base plate 20 is represented by a dashed line. For example... Figure 17 As shown, the protrusion 42 of one base plate 20 and the protrusion 42 of the other base plate 20 are in close contact with each other in the circumferential direction θ.

[0151] Similarly, in the construction of the base plate 20 in the fourth embodiment, the same effect as in the above embodiments can be obtained. In the base plate 20 of the fourth embodiment, the protrusion 42 of one base plate 20 and the protrusion 42 of the other base plate 20 are in close contact.

[0152] Therefore, the positioning ratio of the base plate 20 relative to the mounting hole 83 of the arm 8 is used Figure 2 The base plate 20 described is easier to understand. More specifically, by using the base plate 20 of the fourth embodiment, the positioning accuracy of the base plate 20 relative to the mounting hole 83 in the circumferential direction θ can be improved.

[0153] [Version 5]

[0154] Figure 18 This is a schematic cross-sectional view showing the base plate 20 of the fifth embodiment. (See attached image.) Figure 18 As shown, the protrusion 42 is inclined in the thickness direction Z toward the first surface 22 from the second surface 23 in a manner close to the central axis AX.

[0155] The outer surface 53 and the pressing surface 63 are each inclined in the thickness direction Z from the second surface 23 toward the first surface 22 to approach the central axis AX. The angle between the outer surface 53 and the first surface 22 is greater than 90 degrees. This angle is, for example, 92 degrees to 120 degrees.

[0156] The same effect as in the first embodiment can be achieved using the construction of the base plate 20 of the fifth embodiment. Because the plurality of protrusions 42 are formed discontinuously in the circumferential direction θ, even in the base plate 20 of the fifth embodiment, the balls attach from the second surface 23 toward the first surface 22 in the thickness direction Z. When passing through the mounting hole 83, the protrusions 42 extend outward in the radial direction R and fall down.

[0157] [Sixth Embodiment]

[0158] Figure 19 This is a schematic top view showing the base plate 20 of the sixth embodiment. The base plate 20 of the sixth embodiment differs from that of the above embodiments in that it has three protrusions 42.

[0159] like Figure 19 As shown, the connecting portion 40 of the base plate 20 has three protrusions 42 and three recesses 44. In Figure 19 In the example shown, three protrusions 42 are arranged at equal intervals along the circumferential direction θ, and three recesses 44 are arranged at equal intervals along the circumferential direction θ. The three protrusions 42 are symmetrical about the central axis point AX.

[0160] The three protrusions 42 do not overlap with line LX. When one base plate 20 overlaps with another base plate 20 after rotating 180 degrees around line LX, the three protrusions 42 of one base plate 20 overlap with the three recesses 44 of the other base plate 20, and the three protrusions 42 of one base plate 20 overlap with the three recesses 44 of the other base plate 20. The three protrusions 42 of one base plate 20 do not overlap with the three protrusions 42 of the other base plate 20.

[0161] The first length L1 of the three protrusions 42 is approximately equal to the second length L2 of the three recesses 44. In the sixth embodiment, the circumferential angle θ of the area forming one protrusion 42 is approximately 60 degrees.

[0162] Similarly, in the construction of the base plate 20 in the sixth embodiment, a similar effect to that in the above embodiment can be obtained. In the base plate 20 of the sixth embodiment, the outer surfaces 53 of the three protrusions 42 are arranged at equal intervals in the circumferential direction θ relative to the inner peripheral surface 84 of the mounting hole 83.

[0163] Therefore, when the ball passes through the mounting hole 83 along the thickness direction Z, the inner circumferential surface 84 can be pressed from the outer surface 53 at equal intervals in the circumferential direction θ. As a result, the outer surface 53 can be made to fit tightly against the inner circumferential surface 84 at equal intervals in the circumferential direction θ, and the multiple protrusions 42 can be evenly connected to the mounting hole 83.

[0164] Note that in the sixth embodiment, the first length L1 of the three protrusions 42 may be shorter than the second length L2 of the three recesses 44. In this case, when another base plate 20, rotated 180 degrees around line LX, is superimposed on the first base plate 20, a gap is formed in the circumferential direction θ between the protrusions 42 of one base plate 20 and the protrusions 42 of the other base plate 20.

[0165] [Seventh Embodiment]

[0166] Figure 20 This is a schematic top view showing the base plate 20 of the seventh embodiment. The base plate 20 of the seventh embodiment differs from that of the above embodiments in that it has four protrusions 42.

[0167] like Figure 20 As shown, the connecting portion 40 of the base plate 20 has four protrusions 42 and four recesses 44. Figure 20 In the example shown, four protrusions 42 are arranged at equal intervals along the circumferential direction θ, and four recesses 44 are arranged at equal intervals along the circumferential direction θ. The four protrusions 42 are symmetrical about the central axis point AX.

[0168] The four protrusions 42 do not overlap with lines LX and LY, respectively. When one base plate 20 is rotated 180 degrees around line LX and overlaps with another base plate 20, the four protrusions 42 of one base plate 20 overlap with the four recesses 44 of the other base plate 20, and the four protrusions 42 of the other base plate overlap with the four recesses 44 of one base plate 20. The four protrusions 42 of one base plate 20 do not overlap with the four protrusions 42 of the other base plate 20.

[0169] The first length L1 of the four protrusions 42 is approximately equal to the second length L2 of the four recesses 44. In the seventh embodiment, the circumferential angle θ of the area forming one protrusion 42 is approximately 45 degrees.

[0170] Similarly, in the construction of the base plate 20 in the seventh embodiment, similar effects to those in the above embodiments can be obtained. The base plate 20 of the seventh embodiment is compared to the reference... Figure 2 The base plate 20 of the sixth embodiment described has more protrusions 42. As a result, compared with the reference... Figure 19 Compared to the base plate 20 of the sixth embodiment described, the plurality of protrusions 42 are able to connect to the mounting holes 83 in a better balanced manner.

[0171] Note that in the seventh embodiment, the first length L1 of the four protrusions 42 may be shorter than the second length L2 of the four recesses 44. In this case, when another base plate 20, rotated 180 degrees around line LX, is superimposed on one base plate 20, a gap is formed in the circumferential direction θ between the protrusions 42 of one base plate 20 and the protrusions 42 of the other base plate 20.

[0172] When implementing the invention disclosed in the above embodiments, various specific aspects of each element constituting the suspension for the disk drive can be modified, including specific aspects such as the shape of the base plate, the load-bearing beam, and the flexure.

[0173] Note that the first length L1 of the multiple protrusions 42 can be different. In this case, the circumferential angle θ forming the range of each protrusion 42 is different. For example, when the multiple protrusions 42 consist of two protrusions 42, the range formed by one of the protrusions 42 has an angle θ in the circumferential direction that is approximately equal to 100 degrees, and the angle in the direction θ can be less than or greater than 80 degrees.

[0174] Note that when another base plate 20, rotated 180 degrees around line LX, is superimposed on one base plate 20, the plurality of protrusions 42 of one base plate 20 can be shaped so as not to overlap with the plurality of recesses 44 of the other base plate 20. For example, the plurality of protrusions 42 of the base plate 20 can be symmetrical about line LX. Note that there can be five or more protrusions 42.

Claims

1. A base plate for a suspension system of a disk drive, characterized in that, The disk drive is connected to an arm disposed within the disk drive by a suspension base plate, including: The plate body and The connecting part is set on the plate body. The connecting portion includes a through hole penetrating the plate body in the thickness direction, a plurality of protrusions arranged along the edge of the through hole in the circumferential direction centered on the central axis of the through hole, an insertion mounting hole, and an inner circumferential surface formed by the plurality of protrusions and the through hole. The inner circumferential surface has multiple recesses formed between multiple protrusions. The base plate is configured such that, in a top view, when the base plate is rotated 180 degrees around a line that intersects the central axis of the through hole and is parallel to the extension direction of the suspension for the disk device, the plurality of protrusions overlap the plurality of recesses.

2. The base plate of the suspension for the disk drive according to claim 1, characterized in that, In the circumferential direction, multiple protrusions have a first length. In the circumferential direction, multiple recesses have a second length that is longer than the first length.

3. The base plate of the suspension for the disk drive according to claim 1, characterized in that, Each of the plurality of protrusions has a root connected to the plate body, an extension at one end located on the opposite side of the root in the thickness direction, and a space between the root and the end. The width of the pressing portion in the radial direction intersecting the thickness direction is greater than the width of the root.

4. The base plate of the suspension for a disk drive according to any one of claims 1 to 3, characterized in that, The number of the plurality of protrusions is two, and The number of the plurality of recesses is two.

5. The base plate of the suspension for a disk drive according to claim 4, characterized in that, The plurality of protrusions are symmetrical about the central axis and do not overlap with the line.

6. A suspension for a disk drive, characterized in that, Includes the base plate of the suspension for the disk drive as claimed in claim 1; The load-bearing beam that connects to the base plate; Flexural members arranged along the load-bearing beam.

7. The suspension for a disk drive according to claim 5, characterized in that, The base plate includes the plate body and the connecting parts disposed on the plate body. The connecting part includes a through hole penetrating the plate body in the thickness direction and multiple protrusions arranged along the edge of the through hole in a circumferential direction centered on the central axis of the through hole, for insertion into mounting holes. Multiple protrusions do not overlap with lines that intersect the central axis and are parallel to the extension direction of the load-bearing beam.

8. A disk drive, characterized in that, include: An arm having a first mounting surface, a second mounting surface relative to the first mounting surface, and a mounting hole passing through the first mounting surface and the second mounting surface; A first disk drive suspension, which is the disk drive suspension as described in claim 6, connects to an arm from a first mounting surface. A second disk drive suspension, which is the disk drive suspension as described in claim 6, connects to the arm from the second mounting surface. Multiple protrusions on the first base plate of the first disk drive suspension and multiple protrusions on the second base plate of the second disk drive suspension are inserted into mounting holes. The multiple protrusions of the first base plate overlap with the multiple recesses formed between the multiple protrusions of the second base plate. In the top view, the second base plate overlaps the first base plate after being rotated 180 degrees around a line that intersects the central axis of the through hole and is parallel to the extension direction of the suspension for the disk device.

9. The disk drive according to claim 8, characterized in that, The height of several protrusions is greater than the thickness of the arm.

10. The disk drive according to claim 8, characterized in that, The number of protrusions on the first base plate and the number of protrusions on the second base plate are both two. The number of recesses in the first base plate and the number of recesses in the second base plate are both two.

11. The disk drive according to claim 9, characterized in that, The plurality of protrusions of the first base plate and the second base plate have claw portions that protrude from the arm when the plurality of protrusions are inserted into the mounting holes.

12. The disk drive according to claim 11, characterized in that, At least a portion of the claw is located in the gap formed between the inner circumferential surface of the through hole and the outer surface of the protrusions by radial outward plastic deformation of the plurality of protrusions.

Images