Head actuator and disk device

Abstract

The present invention provides a head actuator and a disk device that have improved reliability by reducing crosstalk between wirings. According to an embodiment, the head actuator and the disk device include a first suspension assembly having a first wiring member and a second suspension assembly having a second wiring member. The first wiring member includes at least four first read wirings and at least four first write wirings spaced apart and arranged in parallel in the width direction of the first wiring member. The plurality of second wirings of the second wiring member include at least four second read wirings and at least four second write wirings spaced apart and arranged in parallel in the width direction of the second wiring member. The at least two first read wirings and the at least two first write wirings are arranged at positions offset in the width direction relative to the second read wirings and the second write wirings in a manner that is not opposite to the second read wirings and the second write wirings in a direction perpendicular to the surface of the first wiring member.

Description

[0001] Related Application

[0002] This application claims the benefit of priority based on Japanese Patent Application No. 2021-089302 (filing date: May 27, 2021), and the entire contents of the basic application are incorporated herein by reference. Technical Field

[0003] Embodiments of the present invention relate to a head actuator and a disk drive including the head actuator. Background Art

[0004] A disk device, for example, a hard disk drive (HDD) includes multiple magnetic disks rotatably arranged in a housing, multiple magnetic heads for reading and writing information on the magnetic disks, and a head actuator for supporting the magnetic heads so as to be movable relative to the magnetic disks.

[0005] The head actuator includes a rotatably supported actuator block and multiple head gimbal assemblies (sometimes referred to as head gimbal assemblies, HGAs) that extend from the actuator block and support the magnetic head at their top ends. The head gimbal assembly includes a support plate with one end fixed to an arm and a flexure (wiring member) mounted on the support plate. The flexure has a freely movable gimbal portion that supports the magnetic head. The flexure extends along the arm to the actuator block.

[0006] As HDDs become larger in capacity, the number of disks and suspensions installed is increasing. This raises concerns about crosstalk not only between flexure wiring in the planar direction but also between flexures of HGAs facing each other in the vertical direction. Summary of the Invention

[0007] An object of the present invention is to provide a head actuator and a disk device that reduce crosstalk between wiring members and improve reliability.

[0008] According to an embodiment, a head actuator and a disk drive include: a first suspension assembly having a first support plate, a first wiring member disposed on the first support plate and having a plurality of first wirings, and a first head supported on the first support plate via the first wiring member and oriented in a first direction; and a second suspension assembly having a second support plate disposed opposite to the first support plate with a gap therebetween, a second wiring member disposed on the second support plate and having a plurality of wirings, and a second head supported on the second support plate via the second wiring member and oriented in a second direction opposite to the first direction. The first wiring member has a first base end portion extending outward from the first support plate, and the second wiring member has a second base end portion extending outward from the second support plate and opposing the first base end portion. The plurality of first wirings include at least four first read wirings and at least four first write wirings, each extending in the longitudinal direction of the first wiring member and arranged in parallel at intervals in the width direction of the first wiring member. The plurality of second wirings include at least four first read wirings and at least four first write wirings, each extending in the longitudinal direction of the second wiring member and arranged in parallel at intervals in the width direction of the second wiring member. At least two of the first read wirings and at least two of the first write wirings are arranged at positions offset from the second read wirings and the second write wirings in the width direction so as not to oppose the second read wirings and the second write wirings in a direction perpendicular to the surface of the first wiring member. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is an exploded perspective view showing a base and a top cover of a hard disk drive (HDD) according to the embodiment.

[0010] Figure 2 It is a perspective view showing the head actuator assembly and FPC unit of the HDD.

[0011] Figure 3 It is a perspective view showing the arm of the head actuator assembly and the head suspension assembly.

[0012] Figure 4 This is an exploded perspective view showing the arm of the head actuator assembly and the head suspension assembly in an exploded manner.

[0013] Figure 5 It is along Figure 3 A cross-sectional view of the arm and flexure along line AA.

[0014] Figure 6 It is a cross-sectional view schematically showing an enlarged cross section of the flexible member.

[0015] Figure 7(a) is a plan view schematically showing a wiring pattern of the first flexure of the head gimbal assembly.

[0016] Figure 7 (b) is a plan view schematically showing a wiring pattern of the second flexure of the head gimbal assembly.

[0017] Figure 8 It is a plan view schematically showing a state in which the first flexible member and the second flexible member are arranged to overlap in the vertical direction.

[0018] Figure 9 (a) is a plan view schematically showing a wiring pattern of a first flexure of a head gimbal assembly in an HDD according to a second embodiment.

[0019] Figure 9 (b) is a plan view schematically showing a wiring pattern of the second flexure of the head gimbal assembly in the HDD according to the second embodiment.

[0020] Figure 10 It is a plan view schematically showing a state in which the first flexible member and the second flexible member of the second embodiment are arranged to overlap in the vertical direction.

[0021] Description of Reference Numerals

[0022] 12... housing, 12... base, 17... magnetic head,

[0023] 18…Disk, 19…Spindle motor, 22…Actuator assembly,

[0024] 25… ramp loading mechanism, 31… gap (groove), 30… suspension assembly,

[0025] 32 ... arm, 38 ... substrate, 40 ... flexible member (wiring member),

[0026] 40UP... upward head side flexible part, 40DN... downward head side flexible part,

[0027] 40b: base end portion, 42: load bar, 60: wiring. DETAILED DESCRIPTION

[0028] Hereinafter, a disk device according to an embodiment will be described with reference to the drawings.

[0029] Furthermore, the disclosure is merely an example, and appropriate modifications that can be readily conceived by those skilled in the art while maintaining the spirit of the invention are naturally within the scope of the present invention. Furthermore, the drawings may schematically illustrate the sizes and shapes of various components compared to actual configurations for the sake of clarity, but these are merely examples and do not limit the interpretation of the present invention. Furthermore, in this specification and the drawings, elements identical to those previously described in the drawings are denoted by the same reference numerals, and detailed descriptions may be omitted.

[0030] (First embodiment)

[0031] A hard disk drive (HDD) according to the first embodiment will be described in detail as the disk device.

[0032] Figure 1 This is an exploded perspective view of the HDD according to the embodiment, showing the cover removed.

[0033] like Figure 1 As shown, the HDD includes a rectangular housing 10. Housing 10 comprises a rectangular box-shaped base 12 with an open top surface and a cover (top cover) 14. Base 12 has a rectangular bottom wall 12a and side walls 12b extending along the periphery of the bottom wall, and is integrally formed from, for example, aluminum. Cover 14 is formed into a rectangular plate from, for example, stainless steel. Cover 14 is screwed onto side walls 12b of base 12 using a plurality of screws 13, airtightly sealing the top opening of base 12.

[0034] A plurality of (for example, 10) magnetic disks 18 serving as disk-shaped recording media and a spindle motor 19 that supports and rotates the magnetic disks 18 are provided in the housing 10. The spindle motor 19 is disposed on the bottom wall 12a. Each magnetic disk 18 has a substrate formed in the shape of a disk having a diameter of 95 mm (3.5 inches) and made of a non-magnetic material (for example, glass), and a magnetic recording layer formed on the upper surface (first surface) and the lower surface (second surface) of the substrate. Each magnetic disk 18 is coaxially fitted into a hub (not shown) of the spindle motor 19 and is clamped by a clamping spring 20. Thus, the magnetic disk 18 is supported in a state parallel to the bottom wall 12a of the base 12. The plurality of magnetic disks 18 are rotated in the direction of arrow B at a predetermined rotational speed by the spindle motor 19. In addition, the number of magnetic disks 18 mounted is not limited to 10, and may be set to 9 or less, 11 or more, or 12 or less.

[0035] Disposed within the housing 10 are a plurality of magnetic heads 17 for recording and reproducing information on a magnetic disk 18, and an actuator assembly 22 for supporting these magnetic heads 17 so that they can move freely relative to the magnetic disk 18. Also disposed within the housing 10 are a voice coil motor (VCM) 24 for rotating and positioning the actuator assembly 22, a ramp loading mechanism 25 for maintaining the magnetic heads 17 in an unloaded position separated from the magnetic disk 18 when the magnetic heads 17 move to the outermost periphery of the magnetic disk 18, a substrate unit (FPC unit) 21 on which electronic components such as a converter connector are mounted, and a spoiler 70.

[0036] The ramp loading mechanism 25 includes a ramp 80. The ramp 80 is fixed to the bottom wall 12a of the base 12 and is located near the periphery of the magnetic disk 18. When the HDD is not in operation, if the magnetic head 17 deviates from the outer periphery of the magnetic disk 18 and moves to a predetermined stop position, a protrusion (described later) of the suspension assembly 30 rides on the ramp 80. This maintains the magnetic head 17 at a position separated from the magnetic disk 18.

[0037] A printed circuit board 27 is screwed onto the outer surface of the bottom wall 12 a of the base 12 . The printed circuit board 27 constitutes a control unit that controls the operation of the spindle motor 19 and controls the operation of the VCM 24 and the magnetic head 17 via the board unit 21 .

[0038] The actuator assembly 22 , the VCM 24 , the substrate unit 21 , and the control section (printed circuit board 27 ) constitute a head actuator in the present application.

[0039] Figure 2 1 is a perspective view showing an actuator assembly. As shown in the figure, the actuator assembly 22 includes an actuator block 29 having a through hole 26, a bearing unit (unit bearing) 28 disposed in the through hole 26, a plurality of (e.g., 11) arms 32 extending from the actuator block 29, a suspension assembly (head gimbal assembly: also sometimes referred to as HGA) 30 mounted on each arm 32, and the magnetic head 17 supported by the suspension assembly 30. A support shaft (pivot) 35 is provided upright on the bottom wall 12a of the base 12. The actuator block 29 is supported by the bearing unit 28 in a manner that allows it to rotate freely around the support shaft 35.

[0040] In this embodiment, the actuator block 29 and eleven arms 32 are integrally formed from aluminum or the like, forming a so-called E-block. The arms 32 are formed, for example, in the shape of elongated flat plates, extending from the actuator block 29 in a direction perpendicular to the support shaft 35. The eleven arms 32 are arranged parallel to each other with gaps therebetween.

[0041] The actuator assembly 22 includes a support frame 33 extending from the actuator block 29 in a direction opposite to the arm 32. The support frame 33 supports a voice coil 39 constituting a part of the VCM 24. Figure 1As shown, the voice coil 39 is located between a pair of yokes 37 , one of which is fixed to the base 12 , and constitutes the VCM 24 together with these yokes 37 and a magnet fixed to one of the yokes.

[0042] like Figure 2 As shown, the actuator assembly 22 includes 20 suspension assemblies 30, each of which supports the magnetic head 17. The suspension assemblies 30 are respectively attached to the extended end 32E of each arm 32. The plurality of suspension assemblies 30 include an upward head suspension assembly that supports the magnetic head 17 upward and a downward head suspension assembly that supports the magnetic head 17 downward. These upward head suspension assemblies and downward head suspension assemblies are formed by arranging the suspension assemblies 30 of substantially the same structure in a manner that changes the vertical orientation.

[0043] In this embodiment, Figure 2 In the embodiment, the downward head suspension assembly 30 is mounted on the uppermost arm 32, and the upward head suspension assembly 30 is mounted on the lowermost arm 32. The upward head suspension assembly 30 and the downward head suspension assembly 30 are mounted on each of the nine middle arms 32.

[0044] The suspension assembly 30 includes a generally rectangular base plate 38, a load rod 42 formed of a slender leaf spring, and a slender, strip-shaped flexure (wiring member) 40. The flexure 40 includes a universal joint portion (described later), on which the magnetic head 17 is mounted. The base end of the base plate 38 is fixed to the extended end of the arm 32, for example, by riveting. The base end of the load rod 42 is fixed to the end of the base plate 38 by overlapping. The load rod 42 extends from the base plate 38 and is formed to taper toward the extended end. The base plate 38 and the load rod 42, which function as a support plate, are formed, for example, from stainless steel.

[0045] The load lever 42 generates a spring force (reaction force) that urges the magnetic head 17 toward the surface of the magnetic disk 18. A protrusion 46 protrudes from the tip of the load lever 42. The protrusion 46 can engage with the aforementioned ramp 80 and together with the ramp 80 constitutes the ramp loading mechanism 25.

[0046] The flexure 40 of each suspension assembly 30 has one end electrically connected to the magnetic head 17, another end extending to the actuator block 29 through a groove formed on the side edge of the arm 32, and a connection end (trailing connection terminal portion) 48c provided at the other end. The connection end 48c is formed into an elongated rectangular shape. A plurality of (for example, 13) connection terminals (connection pads) 51 are provided at the connection end 48c. These connection terminals 51 are respectively connected to the wiring of the flexure 40. The plurality of wirings of the flexure 40 extend over substantially the entire length of the flexure 40, with one end electrically connected to the magnetic head 17 and the other end connected to the connection terminal (connection pad) 51.

[0047] The connection terminals 51 provided on the connection end 48c of the flexure 40 are bonded to the connection pads of the joint portion 21c and are electrically connected to the wiring of the joint portion 21c via the connection pads. Thus, the twenty magnetic heads 17 of the actuator assembly 22 are electrically connected to the base portion 21a via the wiring of the flexure 40, the connection end 48c, the joint portion 21c of the FPC unit 21, and the relay portion 21b.

[0048] like Figure 2 As shown, the FPC unit 21 integrally comprises a base portion 21a, a generally rectangular portion bent into an L-shape, a narrow, strip-shaped intermediate portion 21b extending from one side edge of the base portion 21a, and a joint portion 21c continuous with the top end of the intermediate portion 21b. The base portion 21a, intermediate portion 21b, and joint portion 21c are formed from a flexible printed circuit board (FPC). The FPC comprises an insulating layer, such as a polyimide layer, a conductive layer formed on the insulating layer and having a plurality of wiring lines, connection pads, and the like, and a protective layer covering the conductive layer.

[0049] Electronic components, such as a conversion connector (not shown) and multiple capacitors, are mounted on the base 21a, which are electrically connected to wiring (not shown). A metal plate serving as a reinforcing plate is affixed to the base 21a. The base 21a is mounted on the bottom wall 12a of the base 12. The relay portion 21b extends from the side edge of the base 21a toward the actuator block 29 of the actuator assembly 22. The joint 21c, located at the extended end of the relay portion 21b, is formed into a rectangular shape with a height and width approximately equal to the side surface (mounting surface) of the actuator block 29. The joint 21c is affixed to the mounting surface of the actuator block 29 via a lining plate formed from aluminum or the like and is screwed and fixed to the mounting surface by fixing screws 72. Numerous connection pads are provided on the joint 21c. For example, a head IC (head amplifier) 67 is mounted on the joint 21c, which is connected to the connection pads and the base 21a via wiring. Furthermore, the joint portion 21 c is provided with a connection terminal 68 to which the voice coil 39 is connected.

[0050] When the actuator assembly 22 constructed as described above is assembled to the base 12, the support shaft 35 is erected approximately parallel to the main shaft of the spindle motor 19. Each magnetic disk 18 is located between the two suspension assemblies 30. During operation of the HDD, the magnetic head 17 supported by the two suspension assemblies 30 faces the upper and lower surfaces of the magnetic disks 18, respectively.

[0051] Next, the actuator assembly 22 and the suspension assembly 30 will be described in detail.

[0052] Figure 3 is a perspective view showing the arm and suspension assembly 30, Figure 4 This is an exploded perspective view showing the arm and part of the suspension assembly disassembled.

[0053] As shown in the figure, each arm 32 extending from the actuator block 29 is formed, for example, into a slender, flat plate shape. Each arm 32 has an upper surface (first main surface) 32a, a lower surface (second main surface) 32b that is parallel to and opposite the upper surface, a side surface 32c located on the magnetic disk 18 side and intersecting the upper and lower surfaces 32a and 32b, and a slot (groove) 31 formed in the side surface 32c. The slot 31 extends from the actuator block 29 to the extended end of the arm 32, approximately parallel to the first and second main surfaces 32a and 32b. A portion of the flexure (wiring member) 40 is accommodated and disposed in the slot 31.

[0054] As previously described, the downward-facing suspension assembly 30 is mounted on the uppermost arm 32, and the upward-facing suspension assembly 30 is mounted on the lowermost arm 32. Two suspension assemblies, an upward-facing suspension assembly 30 and a downward-facing suspension assembly 30, are mounted on each of the nine middle arms 32, adjacent and facing each other back to back.

[0055] The base end of the base plate 38 of each suspension assembly 30 is fixed to the top end of the arm 32. The flexure 40 is formed of a thin, strip-shaped laminated plate and has a top end portion 40a and a base end portion 40b. The top end portion 40a is attached to the load beam 42 and the base plate 38. The top end portion of the flexure 40 constitutes the gimbal portion 36, which functions as an elastic support. The magnetic head 17 is mounted and fixed on the gimbal portion 36 and is supported by the load beam 42 via the gimbal portion 36.

[0056] The base end portion 40b of the flexure 40 extends outward from the side edge of the substrate 38, then passes through the slit 31 formed in the side surface 32c of the arm 32, extending to the base end of the arm 32 and the actuator block 29. A connection end (trailing connection terminal portion) 48c of the flexure 54 is formed at the rear end of the base end portion 40b. The connection end 48c is bent at a substantially right angle relative to the base end portion 54b and positioned substantially perpendicular to the arm 32. The connection end 48c has a plurality of connection terminals 51, which are connected to the joint portion 21c of the FPC unit 21.

[0057] Figure 5 It is along Figure 3 A cross-sectional view of the arm and flexure along line AA, Figure 6 This is a cross-sectional view schematically showing an enlarged cross section of the flexure.

[0058] like Figure 5As shown, in the arm 32 to which the two suspension assemblies 30 are attached, two flexures are arranged in the slit 31 of the arm 32: the base end portion 40b of the flexure 40 of the upward-facing suspension assembly 30 and the base end portion 40b of the flexure 40 of the downward-facing suspension assembly 30. Within the slit 31, the base end portions 40b are arranged to face each other in a substantially parallel relationship. When the direction perpendicular to the surface of the flexure 40 is defined as the vertical direction, the two base end portions 40b are arranged to face each other in the vertical direction.

[0059] like Figure 6 As shown, each flexure 40 includes a thin metal plate (metal plate) 50a made of, for example, stainless steel, serving as a base, a base insulating layer 50b adhered or fixed to the thin metal plate 50a, a conductive layer (wiring pattern) 50c formed on the base insulating layer 50b and constituting a plurality of wirings (signal wirings, drive wirings) 60, and a cover insulating layer 50d covering the conductive layer 50c and stacked on the base insulating layer 50b. In the distal end portion 40a of the flexure 40, the thin metal plate 50a is adhered or spot-welded at multiple welding points to the surface of the load beam 42 and the substrate 38.

[0060] The two proximal end portions 40b are arranged so that the metal thin plates 50a face each other in the slit 31. The flexure 40 of the upward-facing head suspension assembly 30 is denoted as 40UP, and the flexure 40 of the downward-facing head suspension assembly 30 is denoted as 40DW.

[0061] Figure 7 40 is a top view schematically showing the wiring patterns of the flexible member 40UP and the flexible member 40DN. Figure 8 It is a plan view schematically showing a state in which the flexible members 40UP and 40DN are arranged in an overlapping manner. Figure 7 and Figure 8 Shown from Figure 6 The wiring pattern of the flexible member 40 is viewed from the B direction (from above).

[0062] In the HDD of this embodiment, for example, a two-dimensional magnetic recording (TDMR) type magnetic head is used for each magnetic head 17. In addition, the HDD employs a dual drive method that enables the upward head and the downward head to operate independently.

[0063] like Figure 7 As shown in FIG. 5A , when the longitudinal direction of the flexure 40 is X and the width direction is Y, the flexure 40UP includes a plurality of (e.g., 15) wirings extending in the longitudinal direction X. The 15 wirings are arranged at intervals in the width direction Y. One end of each wiring is connected to a write element, a read element, an auxiliary element, an HDI sensor, etc. of the magnetic head 17, or a piezoelectric element (not shown), and the other end is connected to a connection terminal 51 of the connection end portion 48 c.

[0064] These wirings include a read wiring (R1-), a read wiring (R1+), a read wiring (R2-), and a read wiring (R2+) for transmitting read signals from the two readers (read heads) of the magnetic head 17. These read wirings are arranged sequentially in the width direction Y from one end, for example, the upper end, toward the lower end of the flexure 40UP in the width direction Y. Next, five wirings LA, LB, LC, LD, and LE are arranged sequentially in the width direction Y.

[0065] Next, the write (interleave) wiring (W-), write (interleave) wiring (W+), write wiring (W-), and write wiring (W+) that supply recording signals to the writer (recording head) of the magnetic head 17 are arranged in the width direction Y. In this embodiment, the width (second width) of the write (interleave) wiring (W+) and write wiring (W-) in the width direction Y is formed to be approximately twice the width (first width) of the write (interleave) wiring (W-) and write (interleave) wiring (W+).

[0066] Furthermore, the two wirings LF and LG are arranged in the width direction Y.

[0067] In one example, when the width of the flexure 40 in the width direction Y is set to 1 mm, the first width of the write wiring is formed to be approximately 40 μm, and the second width is formed to be approximately 80 μm.

[0068] The staggered wiring refers to one of the wirings extending from the head element (mainly the write wiring and the read wiring) by splitting into two just before the base end portion 40b. By splitting into two, the width of each wiring is narrowed, enabling low impedance.

[0069] like Figure 7 As shown in FIG. 2( b ), the flexure 40DN has a plurality of (e.g., 15) wirings extending in the longitudinal direction X. The 15 wirings are arranged at intervals in the width direction Y. One end of each of the 15 wirings is connected to a write element, a read element, an auxiliary element, an HDI sensor, or a piezoelectric element of the magnetic head 17, and the other end is connected to the connection terminal 51 of the connection end portion 48 c. The 15 wirings are arranged in the width direction Y in the opposite direction to the wiring of the flexure 40UP on the upper head side.

[0070] Specifically, from the other end of the width direction Y, for example, the lower end, toward the upper end, the read wiring (R1-), read wiring (R1+), read wiring (R2-), and read wiring (R2+) are arranged in this order in the width direction Y. Next, the five wirings LA, LB, LC, LD, and LE are arranged in this order in the width direction Y.

[0071] Next, the write (interleave) wiring (W-), write (interleave) wiring (W+), write wiring (W-), and write wiring (W+) for supplying recording signals to the writer (recording head) of the magnetic head 17 are arranged in this order in the width direction Y. In this embodiment, the width (second width) of the write (interleave) wiring (W+) and the write wiring (W-) in the Y direction is formed to be approximately twice the width (first width) of the write (interleave) wiring (W-) and the write (interleave) wiring (W+), respectively.

[0072] Furthermore, the two wirings LF and LG are arranged in the width direction Y.

[0073] In one example, when the width of the flexure 40 in the width direction Y is set to 1 mm, the first width of the write wiring is formed to be approximately 40 μm, and the second width is formed to be approximately 80 μm.

[0074] like Figure 8 As shown, the flexure 40UP and the flexure 40DN are vertically overlapped in the gap 31. As described above, by reversing the arrangement of the wiring in the flexure 40UP and the flexure 40DN, the write wiring and the read wiring are not opposed to each other.

[0075] That is, the read wiring (R1-), read wiring (R1+), read wiring (R2-), and read wiring (R2+) of the flexible part 40UP are not relative to the read wiring (R1-), read wiring (R1+), read wiring (R2-), and read wiring (R2+) of the flexible part 40DN in the vertical direction and are greatly separated in the width direction Y.

[0076] Furthermore, at least two read wirings (R1-) and (R1+) of flexure 40UP do not face each other vertically with the write wirings (W+) and (W-) of flexure 40DN, but are offset in the width direction Y. The ends of the read wirings (R2-) and (R2+) of flexure 40UP in the width direction Y (e.g., an area that is less than 50% of the wiring width of the read wiring) face each other vertically with (overlaps with) the write wiring (W-) of flexure 40DN. In other words, the read wirings (R2-) and (R2+) of flexure 40UP are offset in the width direction Y by at least 50% of the wiring width relative to the write wiring (W-) of flexure 40DN.

[0077] By arranging the read wiring and the write wiring of the flexures 40UP and 40DN facing each other in the gap 31 as described above so as not to overlap with each other, crosstalk between these wirings can be reduced.

[0078] As in the present embodiment, when a pair of read wirings (R2-, R2+) connected to one of the two read heads partially overlaps with the write wiring (W-), when the upward head and the downward head are driven separately, the movement of the heads is controlled in such a manner that the overlapping wirings are not affected. That is, the control unit (printed circuit board 27) of the head actuator controls the upward head so that the read operation is performed by the read head connected to the non-overlapping read wirings (R1-, R1+) during the period when the downward head is performing a write operation via the write wirings W+, W-. In other words, the control unit prohibits the read operation of the upward read head connected to the overlapping read wirings R2-, R2+ during the period when the downward head is performing a write operation via the write wirings W+, W-, and only allows the read operation of the read head connected to the non-overlapping read wirings (R1-, R1+).

[0079] Similarly, while the upward head is performing a write operation via the write wirings W+ and W-, the control unit controls the downward head so that it performs a read operation using the read head connected to the non-overlapping read wirings (R1- and R1+) while the upward head is performing a write operation. Regarding the downward head, the control unit controls the downward head so that it performs a read operation using the read head connected to the non-overlapping read wirings (R1- and R1+). In other words, while the downward head is performing a write operation via the write wirings W+ and W-, the control unit prohibits the read operation of the downward head connected to the overlapping read wirings R2- and R2+, and only permits the read operation of the read head connected to the non-overlapping read wirings (R1- and R1+).

[0080] In the HDD constructed as described above, although the upward-facing flexure 40UP and the downward-facing flexure 40DN are arranged vertically adjacent and facing each other within the arm gap, the wiring of these flexures 40UP and 40DN is arranged so that the read and write wiring do not overlap, thereby reducing crosstalk between the wirings. Furthermore, if the write and read wiring partially overlap, control is implemented to prevent the overlapping wiring from being driven simultaneously, thereby eliminating the effects of crosstalk.

[0081] As described above, according to the present embodiment, it is possible to provide a suspension assembly and an HDD capable of reducing crosstalk between wirings and improving reliability.

[0082] Next, HDDs according to other embodiments of the present invention will be described. In the other embodiments described below, the same parts as those in the first embodiment are denoted by the same reference numerals as in the first embodiment, and their detailed description may be simplified or omitted.

[0083] (Second embodiment)

[0084] Figure 9FIG. 1 is a plan view schematically showing the wiring patterns of the flexible member 40UP and the flexible member 40DN in the second embodiment. Figure 10 It is a plan view schematically showing a state in which the flexible members 40UP and 40DN are arranged in an overlapping manner. Figure 9 and Figure 10 Shown from Figure 6 The wiring pattern of the flexible member 40 is viewed from the B direction (from above).

[0085] like Figure 9 As shown in FIG. 4( a ), with the longitudinal direction of the flexure 40 being X and the width direction being Y, the flexure 40UP has the same wiring as the flexure 40UP in the first embodiment described above, and is arranged in the same manner. Specifically, the flexure 40UP includes a read wiring (R1-), a read wiring (R1+), a read wiring (R2-), a read wiring (R2+), five wirings LA, LB, LC, LD, and LE, a write (interleaved) wiring (W-), a write (interleaved) wiring (W+), a write wiring (W-), and a write wiring (W+), and two wirings LF and LG, arranged in order from one end in the width direction Y, for example, the upper end, toward the lower end.

[0086] In the first embodiment, the widths of the write (interleaved) wiring (W+) and the write wiring (W−) in the width direction Y are approximately twice the widths of the write (interleaved) wiring (W−) and the write (interleaved) wiring (W+), respectively. In contrast, in the second embodiment, only the write (interleaved) wiring (W−) is approximately twice the width of the write (interleaved) wiring (W+), while the width of the write wiring (W−) is approximately 1.5 times the width of the write (interleaved) wiring (W−). In other words, the write wiring (W−) is thinner than the write (interleaved) wiring (W+).

[0087] In one example, when the width of the write (interleave) wiring (W-) in the width direction Y is set to 40 μm, the width of the write wiring (W-) in the width direction Y is formed to be approximately 60 μm.

[0088] like Figure 9 As shown in (b), the flexure 40DN has the same wiring as the flexure 40UP in the first embodiment and is arranged in the same manner. The wiring of the flexure DN is arranged in the opposite direction to the wiring of the flexure 40UP on the upper side in the width direction Y.

[0089] That is, the flexible part 40DN has a read wiring (R1-), a read wiring (R1+), a read wiring (R2-), a read wiring (R2+), 5 wirings LA, LB, LC, LD, LE, a write (interleaved) wiring (W-), a write (interleaved) wiring (W+), a write wiring (W-), a write wiring (W+) and 2 wirings LF, LG arranged in sequence in the width direction Y from one end in the width direction Y, for example, the lower end toward the upper end.

[0090] In the second embodiment, only the write (interleave) wiring (W-) is formed to be approximately twice as wide as the write (interleave) wiring (W+), and the width of the write wiring (W-) is formed to be approximately 1.5 times the width of the write (interleave) wiring (W-). In other words, the write wiring (W-) is formed to be thinner than the write (interleave) wiring (W+).

[0091] like Figure 10 As shown, flexure 40UP and flexure 40DN are arranged to overlap vertically within gap 31 of arm 32. As described above, by reversing the arrangement of wiring in flexure 40UP and flexure 40DN, a wiring arrangement is achieved in which the write wiring and the read wiring do not face each other in the vertical direction.

[0092] That is, the read wiring (R1-), read wiring (R1+), read wiring (R2-), and read wiring (R2+) of the flexible part 40UP are not relative to the read wiring (R1-), read wiring (R1+), read wiring (R2-), and read wiring (R2+) of the flexible part 40DN, and are greatly separated in the width direction Y.

[0093] Furthermore, the read wirings (R1-) and (R1+) of the flexure 40UP do not face the write wirings (W+) and (W-) of the flexure 40DN, but are offset in the width direction Y. According to the second embodiment, by forming the write wiring (W-) thinner than the write (interleaved) wiring (W+), the write wiring (W-) and the read wiring (R2-) and (R2+) do not face each other in the vertical direction, that is, they do not overlap in the vertical direction, and are offset in the width direction Y. Thus, by arranging all the read wirings and all the write wirings of the flexures 40UP and 40DN so that they do not overlap, crosstalk between these wirings can be reduced.

[0094] In addition, in the second embodiment, the other structures of the suspension assembly and the HDD are the same as those of the suspension assembly and the HDD of the above-mentioned first embodiment.

[0095] According to the second embodiment constructed as described above, although the upward-facing flexure 40UP and the downward-facing flexure 40DN are arranged vertically adjacent to and facing each other within the gap between the arms, the wiring of these flexures 40UP and 40DN can be arranged so that the read and write wiring do not overlap. This allows for a suspension assembly and HDD that can reduce crosstalk between wirings and improve reliability.

[0096] The present invention is not limited to the above-described embodiments. During implementation, the constituent elements may be modified and concretized within the scope of the present invention. In addition, various inventions can be formed by appropriately combining the multiple constituent elements disclosed in the above-described embodiments. For example, some constituent elements may be deleted from all the constituent elements shown in the embodiments. Furthermore, constituent elements across different embodiments may be appropriately combined.

[0097] For example, in the above-described embodiment, the number of flexible wirings is not limited to 15 and can be increased or decreased as needed. The arrangement of the wirings of flexible 40UP and flexible 40DN can also be reversed. Furthermore, the number of magnetic disks installed is not limited to 10 and can be increased to 11 or 12.

Claims

1. A head actuator comprising: a first suspension assembly comprising a first support plate, a first wiring member provided on the first support plate and having a plurality of first wirings, and a first head supported on the first support plate via the first wiring member and oriented in a first direction; and The second suspension assembly includes a second support plate disposed opposite to the first support plate with a gap therebetween, a second wiring member provided on the second support plate and having a plurality of second wirings, and a second head supported on the second support plate via the second wiring member and oriented in a second direction opposite to the first direction. The first wiring member has a first base end portion extending outward from the first support plate. The second wiring member has a second proximal end portion extending outward from the second support plate and facing the first proximal end portion. The plurality of first wirings include at least four first read wirings and at least four first write wirings, each extending in the longitudinal direction of the first wiring member and arranged in parallel at intervals in the width direction of the first wiring member. The plurality of second wirings include at least four second read wirings and at least four second write wirings, each extending in the longitudinal direction of the second wiring member and arranged in parallel at intervals in the width direction of the second wiring member. At least two of the first read wirings and at least two of the first write wirings are arranged at positions offset in the width direction relative to the second read wiring and the second write wiring so as not to face the second read wiring and the second write wiring in a direction perpendicular to the surface of the first wiring member.

2. The head actuator according to claim 1, The plurality of first wirings include 15 or more first wirings, and the plurality of second wirings include 15 or more second wirings. At least two of the first read wirings and at least two of the first write wirings are arranged perpendicular to the surface of the first wiring member at positions offset by 50% or more of the wiring width in the width direction relative to the second read wiring and the second write wiring.

3. The head actuator according to claim 1, The four first read wirings and the four first write wirings are arranged at positions shifted in the width direction relative to the second read wiring and the second write wiring so as not to face the second read wiring and the second write wiring in the vertical direction.

4. The head actuator according to claim 3, The plurality of first wirings include 15 or more first wirings, and the plurality of second wirings include 15 or more second wirings. The four first read wirings and the four first write wirings are arranged at positions shifted in the width direction relative to the second read wiring and the second write wiring so as not to face the second read wiring and the second write wiring in a direction perpendicular to the surface of the first wiring member.

5. The head actuator according to claim 1, Also provided is an actuator block and a plurality of arms extending from the actuator block, The arm has a slot extending from the extended end of the arm to the actuator block, The first support plate of the first suspension assembly is fixed to the extended end portion of the arm, and the first base end portion is arranged in the slit of the arm. The second support plate of the second suspension assembly is fixed to the extended end portion of the arm, and the second base end portion is arranged in the slit of the arm and faces the first base end portion.

6. The head actuator according to claim 5, The first wiring member includes a metal thin plate, a base insulating layer provided on the metal thin plate, a conductive layer formed on the base insulating layer and forming the first wiring, and a cover insulating layer covering the conductive layer and stacked on the base insulating layer. The second wiring member includes a metal thin plate, a base insulating layer provided on the metal thin plate, a conductive layer formed on the base insulating layer and forming the first wiring, and a cover insulating layer covering the conductive layer and stacked on the base insulating layer. The first proximal portion and the second proximal portion are arranged in the slit in a direction in which the metal thin plates face each other.

7. The head actuator according to claim 1, The four first write wirings include two first write wirings having a first width and two first write wirings having a second width wider than the first width. The four second write wirings include two second write wirings having a first width and two second write wirings having a second width wider than the first width. An end portion in the width direction of one of the first write wirings having the second width faces the second read wiring in the vertical direction. An end portion in the width direction of the second write wiring having one of the second widths faces the first read wiring in the vertical direction.

8. The head actuator according to claim 7, The invention also includes a control unit that prohibits the reading action of the second head via the second read wiring that is partially opposite to each other in the vertical direction during the writing action using the first head via the first write wiring, and prohibits the reading action of the first head via the first read wiring that is partially opposite to each other in the vertical direction during the writing action using the second head via the second write wiring.

9. A disk device comprising: A disc-shaped recording medium is arranged in a rotatable manner; and The head actuator according to claim 1.

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