Suspension structure of disk drive and disk drive

Abstract

The suspension structure of the disk drive according to one embodiment comprises a base member, a first load beam and a second load beam, and is characterized in that the base member further comprises a base part and an attachment surface attached to the base part, the base part is provided with a boss bolting part attached to the arm structure, and the boss bolting part is connected to the first load beam and the second load beam. The attachment surface is provided with a first attachment surface and a second attachment surface, the first attachment surface is opposite to the protruding direction of the boss bolting part, the second attachment surface is in the same direction as the protruding direction of the boss bolting part, the first load beam is attached to the first attachment surface, and the second load beam is attached to the second attachment surface and located at the position opposite to the first load beam.

Description

[0001] Patent priority application

[0002] This application is based on a prior application filed in Japan on February 9, 2024 (patent application number: Japanese Patent Application No. 2024-018584) and claims priority from all matters described in the prior application. Technical Field

[0003] The invention relates to a suspension structure of a disk drive and the disk drive. Background Art

[0004] Hard disk drives (HDDs) are used in information processing devices such as computers. They consist of a disk that rotates around a spindle and a carrier that pivots around a pivot. The carrier has an arm structure and is driven by a positioning motor, such as a voice coil motor, to rotate around the pivot along the disk's track width.

[0005] The suspension for a magnetic disk device (hereinafter referred to as the suspension) is mounted on the arm structure described above. The suspension consists of a base plate connected to the arm structure, a load beam, and a flexure disposed along the load beam. The slider that constitutes the magnetic head is mounted on a gimbal portion formed near the tip of the flexure.

[0006] The slider is provided with elements (signal converters) for accessing data (eg, reading or writing data).The load beam, flexure, slider, and other components constitute a head gimbal assembly.

[0007] In order to adapt to the ever-increasing recording density of magnetic disks, the volume of the head gimbal assembly needs to be further reduced, and the positioning of the slider relative to the recording surface of the magnetic disk needs to be made more precise.

[0008] As recording density continues to increase, the demand for increased recording capacity in hard disk drives is growing. Consequently, the number of disks in hard disk drives (so-called multi-disk configurations) is increasing. In order 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.

[0009] One known method for reducing the distance between disks is to reduce the thickness of the arm structure. Various proposals have been made for reducing the thickness of the arm structure, including Japanese Patent Publication No. 2736174, U.S. Patent Application Publication No. 2021 / 0264941, and Japanese Patent Publication No. 07-111771.

[0010] However, even in view of the inventions disclosed in the above-mentioned patent documents, there is still room for improvement in terms of reducing the thickness of magnetic disk devices. Summary of the Invention

[0011] One object of the present invention is to provide a disk drive suspension structure and a disk drive that can be made thinner.

[0012] According to one embodiment, a suspension structure for a disk drive includes a base, a base member, a first load beam attached to a first attachment surface, and a second load beam attached to a second attachment surface facing the first load beam. The base member includes a base and an attachment surface attached to the base, wherein the base has a boss bolting portion attached to the arm structure, and the attachment surface includes a first attachment surface facing in a direction opposite to the protrusion direction of the boss bolting portion and a second attachment surface facing in a direction toward the protrusion direction of the boss bolting portion.

[0013] The first load beam may have first bent portions formed on both sides of the first load beam and extending in a longitudinal direction of the first load beam. The second load beam may have second bent portions formed on both sides of the second load beam, extending in the longitudinal direction and facing the first bent portions.

[0014] The base may have a first surface facing the arm structure, with the boss bolting portion formed on the first surface. The second attachment surface may be oriented more toward the aforementioned protruding direction than the first surface. The base may also have a second surface opposite the first surface. The first attachment surface may be oriented more toward the aforementioned protruding direction than the second surface.

[0015] The suspension structure of the disk drive may further include a step portion formed between the base portion and the attachment portion. The step portion may include a first inclined surface connecting the first surface and the second attachment surface, and a second inclined surface connecting the second surface and the first attachment surface.

[0016] The base member may include a first member having a first attachment surface, and a second member having a boss bolt connection portion and a second attachment surface and superimposed on the first member. The second member may have a third surface that does not overlap with the first member, and a fourth surface connected to the third surface and facing the first member. The third and fourth surfaces may be located opposite the second attachment surface.

[0017] The base member may include a third member having a boss bolting portion and a first attachment surface, and a fourth member having a second attachment surface and stacked on the third member. The fourth member may be aligned with the boss bolting portion along a longitudinal direction of the first load beam.

[0018] The first load beam may include a first spring portion and a first load flexure. The first spring portion is attached to the first attachment surface, the first load flexure has a first angle, and is formed between the first spring portion and the first flexure along the width of the first load beam. The second load beam may include a second spring portion and a second load flexure. The second spring portion is attached to the second attachment surface, the second load flexure has a second angle different from the first angle, and is formed between the second spring portion and the second flexure along the width of the second load beam. The second angle may be smaller than the first angle.

[0019] The second attachment surface is inclined relative to the first attachment surface along the longitudinal direction of the first load beam, thereby increasing the distance from the first attachment surface. The second load beam may include a second curved portion, wherein the second curved portion is formed on both sides of the second load beam, extends in the longitudinal direction, and forms a gap between the first curved portion and the first curved portion in the width direction of the first load beam. When viewed along the width direction of the first load beam, the first curved portion may overlap the second curved portion. The base member may further include an actuator mounting portion formed between the first attachment surface and the second attachment surface. The actuator mounting portion may be an opening extending through the first and second attachment surfaces.

[0020] A magnetic disk device according to one embodiment includes a suspension structure and an arm structure for the magnetic disk device, wherein the arm structure includes a base fixing portion to which a base member is attached.

[0021] With the above configuration, it is possible to provide a suspension structure for a disk drive and a disk drive that can be made thinner. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constitute a part of this specification, illustrate the presently preferred embodiments of the invention, and together with the preceding brief description and the following detailed description of the preferred embodiments, help explain the nature of the invention.

[0023] Figure 1 is a schematic perspective view showing an example of the magnetic disk device of the first embodiment.

[0024] Figure 2 is a schematic cross-sectional view showing a part of the magnetic disk device of the first embodiment.

[0025] Figure 3 yes Figure 2 A schematic enlarged partial view of the vicinity of the front end of the arm structure is shown.

[0026] Figure 4 It is along Figure 3 Schematic cross-section of the hanging knot on line IV-IV.

[0027] Figure 5This is a schematic plan view showing an example of the suspension structure of the first embodiment.

[0028] Figure 6 1 is a schematic enlarged partial view showing the vicinity of the front end of an arm structure of a magnetic disk device in a comparative example.

[0029] Figure 7 FIG. 1 is a diagram showing the arrangement of a head-suspension structure and a plurality of magnetic disks in a magnetic disk device of a comparative example.

[0030] Figure 8 1 is a diagram showing a combination of a head-suspension structure and an arrangement of a plurality of magnetic disks in the magnetic disk device according to the first embodiment.

[0031] Figure 9 It is a schematic enlarged partial view showing the vicinity of the front end of the arm structure in the magnetic disk device of the second embodiment.

[0032] Figure 10 1 is a schematic enlarged partial view showing the vicinity of the front end of the arm structure in the magnetic disk device of the third embodiment.

[0033] Figure 11 1 is a schematic enlarged partial view showing the vicinity of the front end of the arm structure in the magnetic disk device of the fourth embodiment.

[0034] Figure 12 1 is a schematic enlarged partial view showing the vicinity of the front end of the arm structure in the magnetic disk device of the fifth embodiment.

[0035] Figure 13 1 is a schematic enlarged partial view showing the vicinity of the front end of the arm structure in the magnetic disk device of the sixth embodiment.

[0036] Figure 14 1 is a schematic enlarged partial view showing the vicinity of the front end of the arm structure in the magnetic disk device of the seventh embodiment.

[0037] Figure 15 FIG. 1 is a diagram showing an example of the arrangement of load beams in the suspension structure of the seventh embodiment.

[0038] Figure 16 FIG. 1 is a diagram showing another arrangement example of the load beams in the suspension structure of the seventh embodiment.

[0039] Figure 17 1 is a schematic enlarged partial view showing the vicinity of the front end of the arm structure in the magnetic disk device of the eighth embodiment.

[0040] Figure 18 1 is a schematic enlarged partial view showing the vicinity of the front end of the arm structure in the magnetic disk device of the ninth embodiment.

[0041] Figure 19It is a schematic plan view showing an example of a suspension structure according to a tenth embodiment.

[0042] Figure 20 10. It is a schematic enlarged partial view showing the vicinity of the front end of the arm structure in the magnetic disk device of the tenth embodiment.

[0043] Reference numerals:

[0044] 1, 1E, disk device; 2, housing; 3, spindle; 4, disk; 5, pivot; 6, bracket; 7, positioning motor; 8, 8A, arm structure; 10, suspension structure; 11, slider; 20, base member; 21, base; 23, attachment portion; 25, 27, 250, 271, 273, 2011, 2013, 2021, 2023, 2031, 2033, 25a, 27a, 25b, 27b, 25c, 27c, 2021a, 2021b, surface; 29, boss bolting portion; 29a, 81a, through hole; 30, 30A, 30B, load beam; 31A, spring portion; 33A, 33B, load bending portion; 35A, 37A, 35B, 37B, bending Bend; 40A, 40B, flexure; 41A, front end; 43A, tail end; 45, metal base; 47, wiring portion; 51, tongue; 53, 55, cantilever structure beam; 57, terminal; 61, 63, 65, 67, actuator element; 71, 73, opening; 81, 810, base fixing portion; 83, lower surface; 85, upper surface; 100, suspension member; 200, bottom plate; 201, 202, component; 350, 370, two side portions; D1, D2, D3, D4, D5, W1, W2, distance; DH, thickness; G1, G2, gap; HAS, HSAE, head cantilever structure assembly; SA1, SA2, suspension element; θ1, first angle; θ2, second angle. Specific embodiments

[0045] The following describes various embodiments of the present invention in conjunction with the accompanying drawings. For clarity of explanation, the size, shape and other features of the various parts in the drawings may be shown in schematic form and may be modified according to actual embodiments.

[0046] In addition, for ease of understanding, the figures show mutually perpendicular X-axis, Y-axis, and Z-axis as needed. The direction along the X-axis is referred to as the first direction X, the direction along the Y-axis is referred to as the second direction Y, and the direction along the Z-axis is referred to as the third direction Z. One side of the third direction Z can be referred to as up or upward, and the other side of the third direction Z can be referred to as down or downward.

[0047] First embodiment

[0048] Figure 1 1 is a schematic perspective view showing an example of a magnetic disk device 1 (HDD) according to the present embodiment. Figure 1 In the example shown, the magnetic disk device 1 includes a housing 2, a plurality of magnetic disks 4 (hereinafter referred to as magnetic disks 4) that rotate around a spindle 3, a carriage 6 that is rotatable around a pivot 5, and a positioning motor (voice coil motor) 7 for driving the carriage 6. The housing 2 is sealed by a cover (not shown).

[0049] Figure 2 1 is a schematic cross-sectional view showing a portion of the magnetic disk device 1 of this embodiment. The carriage 6 has a plurality of (possibly three) arm structures 8. Among the plurality of arm structures 8, the centrally located arm structure 8 has a magnetic disk drive suspension structure 10 (hereinafter referred to as the suspension structure 10) attached to its front end.

[0050] Hereinafter, the arm structure 8 to which the suspension structure 10 is attached is referred to as the arm structure 8A. Meanwhile, a disk drive suspension 100 (hereinafter referred to as the suspension 100) is attached to the front end of the other arm structures 8.

[0051] The slider 11 constituting the magnetic head is mounted on the top of the suspension structure 10 and the suspension 100. Two sliders 11 are mounted on one suspension structure 10. On the other hand, only one slider 11 is mounted on one suspension 100.

[0052] like Figure 2 As shown, a plurality of (possibly two) magnetic disks 4 face each other at a predetermined distance, and a suspension structure 10 is located between the two magnetic disks 4. The bracket 6, the suspension structure 10, the suspension member 100, etc. constitute a head assembly HSA.

[0053] When the disk 4 rotates at high speed, air flows between the disk 4 and the slider 11, forming an air bearing. When the positioning motor 7 drives the bracket 6 to rotate, the arm structure 8 moves along the radial direction of the disk 4, and the slider 11 moves to the desired track on the disk 4.

[0054] Figure 3 yes Figure 2 A schematic partial enlarged view of the vicinity of the front end of the arm structure 8A is shown. Figure 4 It is along Figure 3 Schematic cross-sectional view of the suspension structure 10 taken along line IV-IV in FIG. Figure 5 1 is a schematic plan view showing an example of the suspension structure 10 according to the present embodiment.

[0055] exist Figure 3 In the figure, a section of the part is shown. Figure 4 In FIG, only load beams 30A and 30B are shown. Figure 5 In FIG, the suspension structure 10 is viewed from a direction opposite to the third direction Z. FIG.

[0056] like Figure 3As shown, the suspension structure 10 is connected to the arm structure 8A. The arm structure 8A has a base fixing portion 81 at its front end. Figure 3 In the example shown, the thickness of the base fixing portion 81 is smaller than the thickness of other portions.

[0057] The base fixing portion 81 has a through hole 81a for the boss bolting portion described later to pass through. Figure 2 shown) is made of metal materials such as aluminum alloy.

[0058] The suspension structure 10 extends along a first direction X. In this embodiment, the first direction X corresponds to the longitudinal direction of the suspension structure 10. In the first direction X, the side where the slider 11 is mounted relative to the arm structure 8 is referred to as the front end side.

[0059] The second direction Y corresponds to the width direction of the suspension structure 10, and the third direction Z corresponds to the thickness direction of the suspension structure 10. In the following description, the distance along the third direction Z is sometimes referred to as thickness.

[0060] The suspension structure 10 includes a base member 20 and suspension elements SA1 and SA2. The base member 20 is configured to be attachable to the base fixing portion 81 of the arm structure 8A. The base member 20 has a plate-like shape. The base member 20 includes a base portion 21 and an attachment portion 23 connected to the base portion 21. The base portion 21 may correspond to a portion that overlaps with the arm structure 8A.

[0061] The base member 20 has a face 25 and a face 27 opposite to face 25. In this embodiment, face 25 corresponds to the first attachment face, and face 27 corresponds to the second attachment face. Both faces 25 and 27 span the base portion 21 and the attachment portion 23. Face 25 faces the third direction Z, and face 27 faces the direction opposite to the third direction Z.

[0062] The surfaces 25 and 27 are parallel to an XY plane defined by the first direction X and the second direction Y. When the entire arm structure 8A is viewed, the surface 27 includes a region facing the arm structure 8A.

[0063] The base 21 has a boss bolt connection 29. The base member 20 is attached to the arm structure 8A via the boss bolt connection 29. Figure 3 In the example shown, the boss bolting portion 29 is formed on the face 27 of the base 21 .

[0064] The boss bolting portion 29 protrudes from the surface 27 in a direction opposite to the third direction Z. In this embodiment, the third direction Z corresponds to the direction opposite to the protruding direction of the boss bolting portion 29, and the direction opposite to the third direction Z corresponds to the protruding direction of the boss bolting portion 29. The boss bolting portion 29 has, for example, a circular shape when viewed from the third direction Z. The boss bolting portion 29 is formed with a through-hole 29a through which a caulking ball passes.

[0065] The thickness of substrate 20 may be 300 μm or less. In one example, the thickness of base member 20 is 100 to 300 μm. However, the thickness of base member 20 is not limited to the above example. The thickness of base member 20 corresponds to the distance between surface 25 and surface 27. The thickness of base member 20 may be smaller than the thickness of arm structure 8. Here, the thickness of arm structure 8 refers to the thickness of the portion excluding base fixing portion 81.

[0066] The base member 20 is formed of a metal material such as stainless steel. In this embodiment, the base member 20 is formed of a single member.

[0067] The suspension elements SA1 and SA2 are attached to the base member 20. The suspension element SA1 faces the suspension element SA2 across the base member 20. The configuration of the suspension element SA2 is similar to that of the suspension element SA1. Here, the structure of the suspension element SA1 will be mainly described. The suspension element SA1 includes a load beam 30A (first load beam) and a flexure 40A. The load beam 30A is attached to the surface 25 of the base member 20. Figure 5 As shown, the load beam 30A has a shape that tapers toward the front end side.

[0068] The load beam 30A has a spring portion 31A (first spring portion). The load beam 30A is elastically supported on the surface 25 by the spring portion 31A. The load beam 30A is fixed to the surface 25 by spot welding (for example, using a laser).

[0069] The load beam 30A also has a load bend 33A (first load bend) and bends 35A and 37A (first bends). Figure 3 As shown, when viewed in the second direction Y, the load beam 30A is inclined in a direction intersecting the first direction X via the load bent portion 33A.

[0070] The load curved portion 33A is located between the spring portion 31A and the curved portions 35A and 37A in the first direction X. The load curved portion 33A is formed along the second direction Y. The load curved portion 33A has a first angle θ1.

[0071] The first angle θ1 of the load curved portion 33A may be a clockwise angle relative to the spring portion 31A when viewed from the second direction Y. The load beam 30A is along Figure 1 The first direction X in the image is tilted upward.

[0072] The bent portions 35A and 37A are provided on the front end side of the load bent portion 33A. Figure 4As shown, bent portions 35A and 37A are formed on both side portions 350 and 370 of the load beam 30A. The side portions 350 and 370 of the load beam 30A are portions located on both sides of the load beam 30A in the second direction Y. The bent portions 35A and 37A extend along the first direction X. In the load beam 30A, the regions where the bent portions 35A and 37A are formed have greater rigidity than other regions.

[0073] The thickness of the load beam 30A is smaller than that of the base member 20. The thickness of the load beam 30A may be 20 to 80 μm, but is not limited to this example. The load beam 30A is made of a metal material such as stainless steel.

[0074] The flexure 40A is provided along the base member 20 and the load beam 30A, as shown in the figure. A portion of the flexure 40A overlaps the load beam 30A. The flexure 40A can be fixed to the base member 20 and the load beam 30A by spot welding using a laser.

[0075] The flexure 40A includes a front end portion 41A overlapping the load beam 30A and a flexure tail end portion 43A extending from the front end portion 41A toward the rear of the base member 20 .

[0076] The flexure 40A has a metal base 45 which may be made of a thin stainless steel plate, and a wiring portion 47 superimposed on the metal base 45. The thickness of the metal base 45 is smaller than that of the load beam 30A. The thickness of the metal base 45 may be 15 to 20 μm.

[0077] In the front end portion 41A, the flexure 40A further includes a tongue 51 and a pair of cantilever beams 53 and 55. The slider 11 is mounted on the tongue 51. A component capable of converting magnetic and electrical signals, such as an MR element, is disposed at the tip of the slider 11. In the front end portion 41A, the wiring section 47 is electrically connected to the components of the slider 11 via terminals 57. These components allow access to the magnetic disk 4 to perform operations such as writing or reading data.

[0078] The tongue 51 is provided with a pair of cantilever structural beams 53 and 55 on both sides thereof in the second direction Y. The pair of cantilever structural beams 53 and 55 are shaped to protrude outward from both sides of the tongue 51 in the second direction Y. The tongue 51 and the pair of cantilever structural beams 53 and 55 are both part of the metal base 45 , and their respective contours can be formed by etching.

[0079] The gimbal portion is composed of a tongue 51, a pair of cantilever beams 53, 55, etc. The gimbal portion is formed on the front end portion 41A of the flexure 40A. Actuator elements 61 and 63 are mounted on the gimbal portion. The actuator elements 61 and 63 have a function of causing the tongue 51 to swing in the direction S (e.g., Figure 5The slider 11 is provided with a second direction Y. Actuator elements 61 and 63 are arranged on both sides of the slider 11 along the second direction Y. Actuator elements 61 and 63 may be piezoelectric elements and may be made of, for example, lead zirconate titanate (PZT). Actuator elements 61 and 63 are each secured to the tongue 51 using, for example, a conductive adhesive.

[0080] like Figure 3 As shown, the suspension element SA2 includes a load beam 30B (second load beam) and a flexure 40B. The configuration of the load beam 30B and the flexure 40B is similar to that of the load beam 30A and the flexure 40A.

[0081] The load beam 30B is attached to the surface 27 of the base member 20. The load beam 30B faces the load beam 30A. The load beam 30B has a spring portion 31B (second spring portion), a load bent portion 33B (second load bent portion), and bent portions 35B and 37B (second bent portions).

[0082] The load beam 30B is elastically supported on the surface 27 via the spring portion 31B. The load beam 30B is tilted in a direction different from that of the load beam 30A via the load curved portion 33B. The load curved portion 33B has a second angle θ2.

[0083] The second angle θ2 of the load bending portion 33B may be an angle counterclockwise relative to the spring portion 31B when viewed from the second direction Y. In this embodiment, the second angle θ2 is equal to the first angle θ1. Figure 3 As shown, the load beam 30B is tilted downwardly in the first direction X. On the other hand, the load beams 30A, 30B are tilted away from each other in the first direction X via the load bends 33A, 33B, as shown.

[0084] This enables the slider 11 mounted on the suspension member SA1 to read and write data from and to the magnetic disk 4, unlike the slider 11 mounted on the suspension member SA2.

[0085] The bent portions 35B and 37B are formed on both side portions 350 and 370 of the load beam 30B and extend in the first direction X. Looking at the entire suspension element SA1 , the bent portions 35B and 37B face the bent portions 35A and 37A of the load beam 30A, as shown.

[0086] exist Figure 4 In the example shown, the distance W1 between the bent portions 35A and 37A in the second direction Y is equal to the distance between the bent portions 35B and 37B in the second direction Y. The distance W1 gradually narrows along the first direction X.

[0087] The curved portions 35A and 37A are aligned with and spaced apart from the curved portions 35B and 37B in the third direction Z. In other words, a gap G1 is formed between the curved portions 35A and 37A and the curved portions 35B and 37B. The size of the gap G1 gradually increases along the first direction X as shown in the figure.

[0088] Figure 6 1 is a schematic partial enlarged view showing the vicinity of the front end of the arm structure 8 of the magnetic disk device 1E of the comparative example. Figure 7 1 is a diagram showing a head suspension structure combining HSAE and an arrangement of a plurality of magnetic disks 4 in a magnetic disk device 1E of a comparative example. Figure 8 1 is a diagram showing an arrangement of a head suspension structure assembly HSA and a plurality of magnetic disks 4 in the magnetic disk device 1 according to the present embodiment.

[0089] In the magnetic disk device 1E of the comparative example, two suspensions 100 are mounted on the arm structure 8. Specifically, the suspensions 100 are attached to the arm structure 8 from the third direction Z and the direction opposite to the third direction Z, respectively.

[0090] like Figure 7 As shown, a slider 11 is mounted on each tip of the suspension member 100. The suspension member 100 includes a base plate 200, a load beam 30, and a flexure 40. As described above, the arm structure frame 8 in this embodiment is further provided with a suspension member 100 (e.g. Figure 2 shown).

[0091] Base plate 200 has a boss bolt connection and a surface 250. The thickness of base plate 200 can be equal to the thickness of base member 20. Load beam 30 is constructed similarly to load beams 30A and 30B described above. Flexure 40 has the same structure as flexures 40A and 40B described above. Load beam 30 is attached to surface 250 of base plate 200.

[0092] like Figure 6 As shown, two bottom plates 200 are attached to the arm structure 8. Therefore, the thickness of the base fixing portion 810 of the arm structure 8 in the comparative example is greater than the thickness of the base fixing portion 81 in the present embodiment.

[0093] In this embodiment, the distance between the surface 25 and the surface 27 of the base member 20 is defined as the distance D1 ( Figure 3 As shown), the distance between the surfaces 250 of the bottom plate 200 in the comparative example is defined as the distance D2 (as shown Figure 7 ). Distances D1 and D2 correspond to the spacing between the spring portions of the load beam. Distance D1 is smaller than distance D2 (D1 <D2)。

[0094] The head suspension structure assembly HSA can reduce the thickness DH of the head suspension structure assembly HSA by reducing the distance D1 (e.g. Figure 2In particular, when the number of arm structures 8A increases, the thickness can be made smaller.

[0095] Here, it is assumed that the angles of the load bending portions of the load beams 30 , 30A, and 30B are equal. In this case, the distance between the sliders 11 can be reduced by reducing the distance D1 .

[0096] The distance between the sliders 11 in the comparative example is defined as the distance D3 (as Figure 7 As shown), the distance between the sliders 11 in this embodiment is defined as the distance D4 (as shown Figure 8 As mentioned above, the distance D4 is smaller than the distance D3 (D4 <D3)。

[0097] By reducing the distance D4, it is possible to reduce the spacing between the magnetic disks 4. That is, the distance between the magnetic disks 4 in this embodiment is smaller than the distance between the magnetic disks 4 in the comparative example.

[0098] Thus, in this embodiment, the thickness of the magnetic disk device 1 can be reduced while arranging the same number of magnetic disks 4. According to the structure of this embodiment, more magnetic disks 4 can be accommodated in the casing 2 of the same thickness as compared to the magnetic disk device 1E of the comparative example.

[0099] Furthermore, by reducing the distance D1, a sufficient gap can be formed between the magnetic disks 4 and the suspension member 10 when the HSA is located between the magnetic disks 4. This makes it difficult for the HSA to come into contact with the magnetic disks 4.

[0100] In this embodiment, since the suspension elements SA1 and SA2 are mounted on the base member 20, the number of components for mounting the load beam can be reduced compared to the head suspension assembly HSAE in the comparative example, further reducing the component cost.

[0101] Furthermore, by reducing the number of members for connecting the load beams, the thickness of the base member 20 can be increased. This can improve the rigidity of the base member 20. As a result, the resonance characteristics and load stability of the suspension elements SA1 and SA2 can be improved.

[0102] Furthermore, by reducing the number of parts used to connect the load beam, the height of the boss bolting portion 29 can be increased. This allows the base member 20 to be stably attached to the arm structure 8A. As a result, the resonance characteristics and load stability of the suspension elements SA1 and SA2 can be improved.

[0103] In this embodiment, the load direction can be unified when the base member 20 is mounted to the arm structure 8A during the manufacturing process. Specifically, during the crimping process, the direction in which the ball passes through the through hole 29a can be set to one direction (which can also be the direction opposite to the third direction Z).

[0104] Even in this case, the base member 20 can be stably attached to the arm structure 8A. As a result, the resonance characteristics and load stability of the suspension elements SA1 and SA2 can be improved.

[0105] As described above, the configuration of this embodiment enables a disk drive suspension structure 10 that can be made thinner. In particular, in this embodiment, the head suspension assembly HSA can be made thinner. If a disk drive 1 is provided with such a disk drive suspension structure 10, the disk drive 1 can be made even thinner. Furthermore, this embodiment can also provide various other advantageous effects.

[0106] In this embodiment, an example is disclosed in which the suspension structure 10 is mounted on one arm structure 8A among the plurality of arm structures 8 of the bracket 6. However, the suspension structure 10 may be mounted on each of the plurality of arm structures 8 of the bracket 6. The bracket 6 may be connected.

[0107] In the following other embodiments, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and their detailed description may be omitted or simplified.

[0108] Second embodiment

[0109] Figure 9 1 is a schematic enlarged partial view showing the vicinity of the distal end of the arm structure 8A in the magnetic disk device 1 according to the present embodiment. In the present embodiment, the shape of the base member 20 is different from that of the first embodiment.

[0110] The base member 20 has a base 21 and an attachment portion 23. The thickness of the attachment portion 23 is different from that of the base 21. Figure 9 In the example shown, the thickness of the attachment portion 23 is greater than the thickness of the base portion 21 .

[0111] Compared with the first embodiment, the thickness of the base portion 21 in the first embodiment is smaller than the thickness of the base member 20 , and the thickness of the attachment portion 23 is equal to the thickness of the base member 20 in the first embodiment.

[0112] The base member 20 has surfaces 271 and 273 opposite to the surface 25. The surface 271 is located on the base portion 21, and the surface 273 is located on the attachment portion 23. In this embodiment, the surface 25 corresponds to the first attachment surface, the surface 271 corresponds to the first surface, and the surface 273 corresponds to the second attachment surface.

[0113] Surfaces 271 and 273 are parallel to the XY plane. Surface 271 faces the arm structure 8A and has a boss bolt connection portion 29 formed thereon. Figure 9As shown, surface 273 is located below surface 271. In other words, surface 273 is more inclined than surface 271 in a direction opposite to the third direction Z. Load beam 30A is attached to surface 25 of base member 20, and load beam 30B is attached to surface 273 of base member 20.

[0114] In terms of positional relationship with arm structure 8A, surface 273 is located above lower surface 83 of arm structure 8A, while surface 25 is located below upper surface 85 of arm structure 8A. Furthermore, spring portion 31A of load beam 30A is located below upper surface 85.

[0115] The configuration of this embodiment can also achieve the same effects as the first embodiment. In addition, in this embodiment, by changing the thickness of the attachment portion 23 and the thickness of the base portion 21 as described above, the positions of the spring portions 31A and 31B are shifted in the direction opposite to the third direction Z compared to the first embodiment.

[0116] This makes the distance D5 (as Figure 9 Therefore, when the arm structure 8A is located between the magnetic disks 4, the suspension structure 10 is less likely to come into contact with the magnetic disks 4.

[0117] In addition, in this embodiment, compared with the first embodiment, the slider 11 (such as Figure 8 The position of the ) can be moved along the third direction Z or in the direction opposite to the third direction Z. Figure 9 In the example shown, the position of the slider 11 can be moved in a direction opposite to the third direction Z, compared to the first embodiment.

[0118] Third embodiment

[0119] Figure 10 1 is a schematic enlarged partial view showing the vicinity of the distal end of the arm structure 8A in the magnetic disk device 1 according to the present embodiment. The present embodiment is different from the first embodiment in that the base member 20 is composed of a plurality of members.

[0120] The base member 20 has a member 201 and a member 202 overlapping the member 201. In this embodiment, the member 201 corresponds to the first member and the member 202 corresponds to the second member. The member 201 is fixed to the member 202 by spot welding (for example, using a laser).

[0121] The members 201 and 202 each have a plate-like shape. The size of the member 201 is approximately equal to the size of the member 202 when viewed from the third direction Z. The base portion 21 and the attachment portion 23 of the base member 20 are composed of the member 201 and the member 202.

[0122] The component 201 has a surface 2011 and a surface 2013 opposite to the surface 2011. The component 202 has a surface 2021, a surface 2023 opposite to the surface 2021, and a boss bolting portion 29.

[0123] In this embodiment, surface 2011 corresponds to the first attachment surface, and surface 2023 corresponds to the second attachment surface. Surface 2013 is located opposite surface 2021. Surface 2023 is formed with a boss bolting portion 29. Load beam 30A is attached to surface 2011 of component 201, while load beam 30B is attached to surface 2023 of component 202.

[0124] The configuration of this embodiment also provides the same effects as the first embodiment. In this embodiment, base member 20 includes member 201 and member 202. During the manufacturing process, load beam 30A is attached to surface 2011 of member 201, and load beam 30B is attached to surface 2023 of member 202. Thereafter, load bends 33A and 33B are formed on load beams 30A and 30B, respectively.

[0125] Then, after the components 201 and 202 are joined together, the suspension structure 10 is mounted on the arm structure 8A. In this manner, since the load beams 30A and 30B are attached to separate components, the load bends 33A and 33B can be easily machined. According to this embodiment, the manufacturing productivity of the suspension structure 10 can be improved.

[0126] Fourth embodiment

[0127] Figure 11 1 is a schematic enlarged partial view showing the vicinity of the distal end of the arm structure 8A in the magnetic disk device 1 according to the present embodiment. In this embodiment, the shape of the member 201 is different from that of the third embodiment.

[0128] In this embodiment, the base portion 21 of the base member 20 is formed by the member 202, and the attachment portion 23 is formed by the members 201 and 202. In other words, the member 201 may not overlap with the boss bolting portion 29 of the member 202. Figure 11 As shown, the length of the component 201 in the first direction X is smaller than the length of the component 202 in the first direction X.

[0129] The surface 2021 of the component 202 includes a surface 2021a that does not overlap with the component 201 and a surface 2021b that faces the component 201. The surface 2021b is connected to the surface 2021a. In this embodiment, the surface 2021a corresponds to the third surface, and the surface 2021b corresponds to the fourth surface.

[0130] The configuration of this embodiment also achieves the same effects as the third embodiment. Furthermore, in this embodiment, the length of the component 201 in the first direction X is smaller than that of the component 201 in the third embodiment. Consequently, the mass of the base member 20 can be reduced compared to that of the third embodiment.

[0131] In other words, the mass of the head suspension assembly HSA can be made smaller than that of the head suspension assembly HSA in the third embodiment. As a result, the responsiveness of the head assembly HSA can be improved.

[0132] Fifth embodiment

[0133] Figure 12 1 is a schematic enlarged partial view showing the vicinity of the distal end of the arm structure 8A in the magnetic disk device 1 according to the present embodiment. This embodiment 1 differs from the second embodiment in that the attachment portion 23 of the base member 20 is composed of a plurality of members.

[0134] The base member 20 has a member 202 and a member 203 overlapping the member 202. In this embodiment, the member 202 corresponds to the third member and the member 203 corresponds to the fourth member. The member 203 is fixed to the member 202 by spot welding (for example, using a laser).

[0135] In this embodiment, the base portion 21 of the base member 20 is formed by the component 202, and the attachment portion 23 is formed by the components 202 and 203. The component 203 may not overlap with the boss bolting portion 29 of the component 202. That is, the component 203 is aligned with the boss bolting portion 29 in the first direction X.

[0136] The component 203 has a plate shape. Figure 12 As shown, the length of the component 203 in the first direction X is smaller than the length of the component 202 in the first direction X.

[0137] Component 203 has a face 2031 facing face 2023 and a face 2033 opposite face 2031. In this embodiment, face 2021 corresponds to a first attachment face, and face 2033 corresponds to a second attachment face. Load beam 30A is attached to face 2021 of component 202, while load beam 30B is attached to face 2033 of component 203.

[0138] like Figure 12 As shown, surface 2033 is located below surface 2021. In other words, surface 2033 is configured to be offset relative to surface 2021 in a direction opposite to third direction Z. This embodiment also achieves the same effects as the second embodiment. Furthermore, in this embodiment, since load beams 30A and 30B are attached to a separate member, load bends 33A and 33B can be easily machined.

[0139] Sixth embodiment

[0140] Figure 13 1 is a schematic enlarged partial view showing the vicinity of the distal end of the arm structure 8A in the magnetic disk device 1 according to the present embodiment. In the present embodiment, the shape of the base member 20 is different from that of the first embodiment.

[0141] The base member 20 also has a stepped portion 22 formed between the base portion 21 and the attachment portion 23. The base portion 21, the attachment portion 23, and the stepped portion 22 may have uniform thickness. The surface 25 of the base member 20 includes a surface 25a located on the base portion 21, a surface 25b located on the attachment portion 23, and a surface 25c located on the stepped portion 22.

[0142] The surface 27 of the base member 20 has a surface 27a at the base 21, a surface 27b at the attachment portion 23, and a surface 27c at the step portion 22. The surface 27a faces the arm structure 8A and has a boss bolting portion 29 formed thereon.

[0143] In this embodiment, surface 25a corresponds to the second surface, surface 25b corresponds to the first attachment surface, surface 27a corresponds to the first surface, and surface 27b corresponds to the second attachment surface. Surfaces 25a, 25b, 27a, and 27b are parallel to the XY plane. Load beam 30A is attached to surface 25b of base member 20, and load beam 30B is attached to surface 27b of base member 20. Surfaces 25c and 27c may be inclined surfaces that are tilted relative to the first direction X. In this embodiment, surface 25c corresponds to the second inclined surface, and surface 27c corresponds to the first inclined surface. Specifically, as shown in the figure, surfaces 25c and 27c are tilted downward in the first direction X.

[0144] As a result, surface 25b is located lower than surface 25a, and surface 27b is located lower than surface 27a. In other words, surface 25b is arranged to be offset from surface 25a in the direction opposite to the third direction Z, and surface 27b is arranged to be offset from surface 27a in the direction opposite to the third direction Z.

[0145] In relation to arm structure 8A, surface 27b is located above lower surface 83 of arm structure 8A, while surface 25b is located below upper surface 85 of arm structure 8A. Furthermore, spring portion 31A of load beam 30A is located below upper surface 85.

[0146] The configuration of this embodiment can also achieve the same effects as the first and second embodiments. The shape of the step portion 22 is not limited to Figure 2 Example shown.

[0147] Seventh embodiment

[0148] Figure 141 is a schematic enlarged partial view showing the vicinity of the tip of the arm structure 8A in the magnetic disk device 1 according to the present embodiment. In the present embodiment, the thickness of the base member 20 is different from that in the first embodiment.

[0149] Specifically, the thickness of the base member 20 is smaller than that of the base member 20 in the first embodiment. Therefore, when viewed in the second direction Y, at least a portion of the load beam 30A overlaps with the load beam 30B. In other words, the base member 20 has a thickness such that at least a portion of the load beam 30A overlaps with the load beam 30B.

[0150] Specifically, when viewed from the second direction Y, the bent portions 35A and 37A overlap with the bent portions 35B and 37B. Figure 14 In the embodiment, when viewed along the second direction Y, the areas where the curved portions 35A and 37A overlap with the curved portions 35B and 37B are provided with a dot pattern. The overlapping areas between the curved portions 35A and 37A and the curved portions 35B and 37B gradually decrease in the first direction X.

[0151] Figure 15 and Figure 16 30A and 30B are diagrams showing an example of arrangement of the load beams 30A and 30B of the suspension structure 10 in this embodiment.

[0152] exist Figure 15 In the example shown, the distance W1 between the curved portions 35A and 37A in the second direction Y is different from the distance W2 between the curved portions 35B and 37B in the second direction Y. Specifically, the distance W1 between the curved portions 35A and 37A in the second direction Y is greater than the distance W2 between the curved portions 35B and 37B in the second direction Y.

[0153] The load beam 30B is located between the bent portions 35A and 37A of the load beam 30A in the second direction Y. A distance W1 in the second direction Y between the bent portions 35A and 37A may be smaller than a distance W2 in the second direction Y between the bent portions 35B and 37B.

[0154] exist Figure 16 In the example shown, the distance W1 between the bent portions 35A and 37A in the second direction Y is equal to the distance between the bent portions 35B and 37B in the second direction Y. The center of the load beam 30A in the second direction Y is offset from the center of the load beam 30B in the second direction Y.

[0155] Specifically, the load beam 30B is offset to the left in the figure (in the second direction Y) relative to the center of the load beam 30A. Alternatively, the load beam 30B may be offset to the right in the figure (in the direction opposite to the second direction Y) relative to the center of the load beam 30A. Figure 16 and Figure 15Similar to the example in , the distance W1 between the bent portions 35A and 37A in the second direction Y may be different from the distance W2 between the bent portions 35B and 37B in the second direction Y.

[0156] exist Figure 15 and Figure 16 In the example shown, the bent portions 35A and 37A form gaps G2 between themselves and the bent portions 35B and 37B in the second direction Y. Figure 15 and Figure 16 In the arrangement shown in the example of FIG, even if the thickness of the base member 20 is reduced, the load beams 30A, 30B are less likely to interfere with each other.

[0157] The configuration of this embodiment can also achieve the same effect as the first embodiment. In addition, in this embodiment, the thickness of the substrate 20 can be reduced. The structure of this embodiment can also be applied to the above-mentioned embodiments.

[0158] Eighth embodiment

[0159] Figure 17 1 is a schematic enlarged partial view showing the vicinity of the distal end of the arm structure 8A in the magnetic disk device 1 according to this embodiment. This embodiment differs from the first embodiment in that the first angle θ1 of the load bend 33A of the load beam 30A is different from the second angle θ2 of the load bend 33B of the load beam 30B.

[0160] exist Figure 17 In the example shown, the second angle θ2 of the load bend 33B is smaller than the first angle θ1 of the load bend 33A. The first angle θ1 of the load bend 33A is larger than that of the first embodiment. In contrast, the second angle θ2 of the load bend 33B is smaller than that of the first embodiment.

[0161] The configuration of this embodiment can also achieve the same effect as the first embodiment. In this embodiment, compared with the first embodiment, the slider 11 (such as Figure 8 As shown) is offset to the third direction Z or the position in the opposite direction of the third direction. Figure 17 In the example shown, the position of the slider 11 can be shifted in a direction opposite to the third direction Z compared to the first embodiment.

[0162] Furthermore, the distance between the magnetic disks 4 can be adjusted according to the first angle θ1 of the load curved portion 33A and the second angle θ2 of the load curved portion 33B. The structure of this embodiment can also be applied to the above-mentioned embodiments.

[0163] Ninth embodiment

[0164] Figure 181 is a schematic enlarged partial view showing the vicinity of the distal end of the arm structure 8A in the magnetic disk device 1 according to this embodiment. In this embodiment, the shape of the base member 20 is different from that of the first embodiment.

[0165] Surface 27 has surface 27d located at attachment portion 23. In this embodiment, surface 25 corresponds to the first attachment surface, and surface 27d corresponds to the second attachment surface. Load beam 30A is attached to surface 25 of base member 20, and load beam 30B is attached to surface 27d of base member 20.

[0166] The surface 27d is an inclined surface with respect to the surface 25. Specifically, the surface 27d is inclined relative to the surface 25 in the first direction X so that the distance between the surface 27d and the surface 25 in the third direction Z becomes larger. The angle θ3 of the surface 27d with respect to the first direction X can be appropriately changed according to the distance between the magnetic disks 4. In addition, the first angle θ1 of the load bending portion 33A (e.g., Figure 3 ) may be equal to or different from the second angle θ2 of the load bending portion 33B (as shown in FIG. Figure 3 shown).

[0167] The configuration of this embodiment can also achieve the same effect as the first embodiment. In this embodiment, compared with the first embodiment, the position of the slider 11 (such as Figure 8 As shown) is offset toward a third direction Z, or in a direction opposite to the third direction.

[0168] exist Figure 18 In the example shown, compared to the first embodiment, the position of the slider 11 can be shifted in the direction opposite to the third direction Z. In addition, the distance between the magnetic disks 4 can be adjusted according to the angle θ3 of the surface 27 d relative to the first direction X.

[0169] In this embodiment, surface 27 is inclined. Surface 25 to which load beam 30A is attached may also be inclined. Alternatively, surfaces 25 to which load beams 30A and 30B are attached may also be inclined. Each of these surfaces may be inclined. The structure of this embodiment can also be applied to the aforementioned embodiments.

[0170] Tenth embodiment

[0171] Figure 19 is a schematic plan view showing an example of the suspension structure 10 according to the present embodiment. Figure 20 1 is a schematic partial enlarged view showing the vicinity of the distal end of the arm structure 8A in the magnetic disk device 1 according to this embodiment. This embodiment is different from the first embodiment in that the actuator elements 65 and 67 are mounted on the base member 20.

[0172] exist Figure 19In the example shown, the suspension structure 10 has actuator elements 61 , 63 mounted on the front end side and actuator elements 65 , 67 mounted on the base member 20 .

[0173] The base member 20 has openings 71, 73 formed in the attachment portion 23 (eg, Figure 19 ), for mounting actuator elements 65, 67. In this embodiment, openings 71 and 73 correspond to actuator mounting portions.

[0174] Openings 71 and 73 are formed between surface 25 and surface 27. Specifically, openings 71 and 73 penetrate through surface 25 and surface 27. Looking at the entire suspension elements SA1 and SA2, actuator elements 65 and 67 are located between load beams 30A and 30B, as shown.

[0175] The configuration of this embodiment also achieves the same effects as the first embodiment. In this embodiment, actuator elements 65 and 67 are mounted on the base member 20. As a result, the actuator elements 65, 67 act on the suspension elements SA1, SA2, respectively.

[0176] As a result, since it is not necessary to mount an actuator element on each suspension element SA1 or SA2, the number of actuator elements to be mounted can be reduced, which makes it possible to reduce component costs.

[0177] In carrying out the above-described embodiments, various modifications may be made to specific aspects of the components constituting the magnetic disk device, including parameters such as the structure of the arm, the base member, the load beam, and the shape of the flexure.

[0178] By appropriately combining the multiple constituent elements disclosed in the above embodiments, various embodiments can be formed. Some components can be omitted from all the components shown in the various embodiments. In addition, components from different embodiments can be appropriately combined.

Claims

1. A suspension structure for a magnetic disk device attached to an arm structure of a magnetic disk drive, comprising: The base member further includes a base and an attachment surface attached to the base, wherein the base has a boss bolting portion attached to the aforementioned arm structure, and the attachment surface has a first attachment surface facing in a direction opposite to the protruding direction of the aforementioned boss bolting portion and a second attachment surface facing in the same direction as the protruding direction toward the boss bolting portion. a first load beam attached to the first attachment surface, A second load beam is attached to the second attachment surface and is located opposite the first load beam.

2. The disk drive suspension structure according to claim 1, wherein: The first load beam has first bent portions formed on both sides of the first load beam and extending in a longitudinal direction of the first load beam, The second load beam has second bent portions formed on both sides of the second load beam, extending in the longitudinal direction and located opposite to the first bent portion.

3. The disk drive suspension structure according to claim 1, wherein: The base has a first surface facing the arm structure, wherein the aforementioned boss bolt connection portion is formed on the first surface, The second attachment surface may be oriented in a direction closer to the protruding direction of the boss bolting portion than the first surface.

4. The disk drive suspension structure according to claim 3, wherein: The base also has a second side opposite to the first side, The first attachment surface may be oriented in a direction closer to the protruding direction of the boss bolting portion than the second surface.

5. The disk drive suspension structure according to claim 4, wherein: The suspension structure of the disk drive further has a step portion formed between the base portion and the attachment portion. The step portion includes a first inclined surface connecting the first surface and the second attachment surface, and a second inclined surface connecting the second surface and the first attachment surface.

6. The disk drive suspension structure according to claim 1, wherein: The base component includes a first component and a second component, wherein the first component has a first attachment surface, and the second component has a boss bolting portion and a second attachment surface and is stacked on the first component.

7. The disk drive suspension structure according to claim 6, wherein: The second member has a third surface that does not overlap with the first member, and a fourth surface connected to the third surface and facing the first member, the third surface and the fourth surface being located opposite to the second attachment surface.

8. The disk drive suspension structure according to claim 1, wherein: The base member further includes a third member and a fourth member, wherein the third member has a boss bolt connection portion and a first attachment surface, and the fourth member has a second attachment surface and is stacked on the third member.

9. The disk drive suspension structure according to claim 8, wherein: The fourth member is aligned with the boss bolting portion along the longitudinal direction of the first load beam.

10. The disk drive suspension structure according to claim 2, wherein: The first load beam further includes a first spring portion and a first load bending portion, wherein the first spring portion is attached to the first attachment surface, the first load bending portion has a first angle and is formed between the first spring portion and the first bending portion along the width direction of the first load beam. The second load beam further includes a second spring portion and a second load bending portion, wherein the second spring portion is attached to the second attachment surface, the second load bending portion has a second angle different from the first angle, and is formed between the second spring portion and the second bending portion along the width direction of the second load beam.

11. The disk drive suspension structure according to claim 10, wherein: The second angle is smaller than the first angle.

12. The disk drive suspension structure according to claim 1, wherein: The second attachment surface is inclined relative to the first attachment surface along the longitudinal direction of the first load beam so that a distance therefrom becomes greater.

13. The disk drive suspension structure according to claim 1, wherein: The second load beam further includes a second bent portion, wherein the second bent portion is formed on both sides of the second load beam and extends in the longitudinal direction, and a gap is formed between the second bent portion and the first bent portion in the width direction of the first load beam, and when viewed in the width direction of the first load beam, the first bent portion may overlap with the second bent portion.

14. The disk drive suspension structure according to claim 1, wherein: The base member also includes an actuator mounting portion formed between the first attachment surface and the second attachment surface.

15. The disk drive suspension structure according to claim 14, wherein: The actuator mounting portion is an opening extending through the first attachment surface and the second attachment surface.

16. A magnetic disk device, comprising: The suspension structure and arm structure of a disk drive according to any one of claims 1 to 15, The arm structure has a base fixing portion, and a base component is attached to the base fixing portion.

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