Disc clamp and disc device

Abstract

Provided are a disc chuck and a disc device capable of easily adjusting the unbalance of a rotating body and capable of improving the yield of the device. According to an embodiment, the disc chuck has: a disc-shaped main body (21) having a central axis (C); an annular assembly groove (40) provided on a first surface (S1) of the main body and capable of accommodating a wire for unbalance adjustment; a plurality of through holes formed through the main body and provided at equal intervals in the circumferential direction around the central axis and each capable of accommodating a fixing screw (SC); and a plurality of internally threaded holes (44) formed on the first surface of the main body and provided at equal intervals in the circumferential direction and each capable of accommodating an adjustment screw (SA) for balance adjustment.

Description

[0001] This application claims priority to Japanese Patent Application No. 2022-004385 (filed on January 14, 2022). This application incorporates the entire contents of that basic application by reference. Technical Field

[0002] The embodiments of the present invention relate to a disk clamping member for clamping a disk and a disk device having the disk clamping member. Background Technology

[0003] As a disk drive, for example, a hard disk drive (HDD) includes multiple disks rotatably disposed within a housing, multiple read / write heads for reading and writing information to the disks, and head actuators that support the heads in a manner that allows them to move relative to the disks. A spindle motor is disposed on the bottom wall of the housing. The multiple disks are mounted on the spindle motor hub and secured to the hub by disc-shaped clamps.

[0004] Typically, the inner diameter of the disk and the spacer rings sandwiched between the disks is designed to be slightly larger than the diameter of the spindle hub to allow for smooth insertion into the spindle motor hub. Therefore, there is a radial looseness of about ten micrometers between the mounted disk, spacer rings, and hub. If the disk and spacer rings are fixed in a position where their center of gravity is offset relative to the hub's rotation center, this will cause a deviation in the center of gravity of the rotating body (imbalance).

[0005] Imbalance in the rotating body becomes a source of vibration relative to the device itself and its surrounding structure, causing adverse effects such as performance degradation of the disk drive. Therefore, it is desirable to minimize this imbalance. One known method for correcting imbalance is to place an arc-shaped wire in the slot of the disk clamping member and adjust it to achieve an imbalance of less than a certain amount. The amount of imbalance correction can be adjusted by the length of the wire. Furthermore, increasing the weight by thickening the wire can improve the wire's balance correction capability.

[0006] However, as the number of platters and spacers in a disk drive increases, imbalances in various components can accumulate, sometimes resulting in a large imbalance that cannot be fully corrected by wiring alone. Such imbalances can only be corrected by disassembly and reassembly, becoming one of the factors that degrade the manufacturing efficiency of disk drives.

[0007] Furthermore, with the increased thickness of the cable used for balancing and correction, the slots for inserting the cable must also be enlarged, requiring an increase in the thickness of the clamping plate. If the clamping plate becomes thicker, it will become an obstacle when mounting many disks and clamping components within a fixed device height. Moreover, the increased cable thickness reduces flexibility, making installation into the clamping slot more difficult. Summary of the Invention

[0008] Embodiments of the present invention provide a disc clamping member and a disc device that can easily adjust the imbalance of the rotating body and improve the yield of the device.

[0009] According to an embodiment, the disc clamping member comprises: a disc-shaped main body having a central axis; an annular mounting groove disposed on a first surface of the main body for filling with wire for imbalance adjustment; a plurality of through holes formed through the main body and equally spaced around the central axis in the circumferential direction for inserting fixing screws; and a plurality of internally threaded holes formed on the first surface of the main body and equally spaced around the circumferential direction for engaging adjusting screws for balance adjustment. Attached Figure Description

[0010] Figure 1 This is an exploded perspective view of the first embodiment of the hard disk drive (HDD) shown with the top cover disassembled.

[0011] Figure 2 It is along Figure 1 A cross-sectional view of the HDD with the line EE.

[0012] Figure 3 This is a top view of the disc clamping component.

[0013] Figure 4 This is a top view of the disc clamping component installed on the spindle hub.

[0014] Figure 5 It is along Figure 4 A cross-sectional view of the disc clamp of line BB.

[0015] Figure 6 It is along Figure 4 A cross-sectional view of the disc clamping member of line AA.

[0016] Figure 7 This is a cross-sectional view of a modified disc clamping component.

[0017] Figure 8 This is a flowchart illustrating the clamping and mounting process of the HDD according to the first embodiment.

[0018] Figure 9 (a) and (b) are schematic diagrams illustrating an example of imbalance adjustment of the HDD in the first embodiment.

[0019] Figure 10 This is a top view of the disk holder in the hard disk drive (HDD) according to the second embodiment.

[0020] Figure 11 This is a top view of the disc clamping component installed on the spindle hub.

[0021] Figure 12 (a) and (b) are perspective views showing the disc clamping components before and after the installation of the washer and adjusting screw.

[0022] Figure 13 (a) and (b) are top views showing the washer and adjusting screw enlarged.

[0023] Explanation of reference numerals in the attached figures

[0024] 10…House, 12…Base, 12a…Bottom wall, 17…Head, 18…Disk, 19…Spindle motor, 20…Disk clamp, 21…Body, 22A…Fixing part, 22B…Pressing part, 27…Actuator assembly, 40…Assembly slot, 42…Through hole, 44…Internal thread hole, 46…Recess, 64…Spindle hub, S1…First surface, SC…Fixing screw, SA…Adjusting screw, SW…Washer, W…Wire Detailed Implementation

[0025] Hereinafter, the disk device of the embodiment will be described with reference to the accompanying drawings.

[0026] Furthermore, the disclosure is merely one example, and appropriate modifications that can be readily conceived by those skilled in the art to maintain the spirit of the invention are naturally included within the scope of this invention. Additionally, the accompanying drawings, for the purpose of clarity, schematically represent the size, shape, etc., of various parts compared to the actual form, but this is merely an example and does not limit the interpretation of the invention. Furthermore, in this specification and the various drawings, the same reference numerals are used for the same elements as those described above with respect to previously presented figures, and detailed descriptions are sometimes appropriately omitted.

[0027] (First Embodiment)

[0028] As a disk device, the hard disk drive (HDD) of the first embodiment will be described in detail.

[0029] Figure 1 This is an exploded perspective view of the HDD of the first embodiment shown with the cover exposed.

[0030] As shown in the figure, the HDD has a generally rectangular housing 10. The housing 10 has a rectangular box-shaped base 12 with an opening on the upper surface, an inner cover 14 that is threaded onto the base 12 by a plurality of screws 13 and closes the upper opening of the base 12, and an outer cover (top cover) 16 that overlaps with the inner cover 14 and is welded to the base 12 at its periphery. The base 12 has a rectangular bottom wall 12a that is opposite to the inner cover 14 with a gap, and side walls 12b that are erected along the periphery of the bottom wall 12a, for example, integrally formed of aluminum alloy. The side walls 12b include a pair of long side walls and a pair of short side walls that are opposite to each other. A generally rectangular frame-shaped fixing rib 12c is provided protruding from the upper end face of the side wall 12b.

[0031] The inner cover 14 is formed into a rectangular plate, for example, from stainless steel. The periphery of the inner cover 14 is threaded to the upper surface of the side wall 12b by screws 13, and fixed to the inner side of the fixing rib 12c. The outer cover 16 is formed into a rectangular plate, for example, from aluminum. The outer cover 16 has a planar dimension slightly larger than that of the inner cover 14. The periphery of the outer cover 16 is welded to the fixing rib 12c of the base 12, and is hermetically fixed to the base 12. After the outer cover 16 is fixed, a gas with a density lower than air, such as helium (He), is sealed into the housing 10.

[0032] The housing 10 contains multiple disks 18, for example, ten disks, which are disc-shaped recording media, and a spindle motor 19, which supports and rotates the disks 18. The spindle motor 19 is mounted on the bottom wall 12a. Each disk 18 is formed, for example, into a circular plate with a diameter of 96 mm (3.5 inches) and a thickness of 0.5 to 0.635 mm, and has a substrate made of a non-magnetic material, such as glass or aluminum, and magnetic recording layers formed on the upper surface (first surface) and lower surface (second surface) of the substrate. Each disk 18 is coaxially fitted into the spindle hub of the spindle motor 19 (described later) and is held by a disk clamp (hereinafter referred to as a clamp) 20. Thus, the disks 18 are supported in a position parallel to the bottom wall 12a of the base 12. The multiple disks 18 are rotated at a predetermined speed by the spindle motor 19. Furthermore, the number of disks 18 mounted is not limited to 10, but may be 9 or less or 11 or more.

[0033] The housing 10 houses multiple magnetic heads 17 for recording and reproducing information on the disk 18, and an actuator assembly 27 that supports these heads 17 so that they can move freely relative to the disk 18. Additionally, the housing 10 houses a voice coil motor (VCM) 24 for rotating and positioning the actuator assembly 27, a ramp loading mechanism 25 for holding the heads 17 in an unloading position separated from the disk 18 when they move to the outermost periphery, a turbulence diffuser 70, and a board unit (FPC unit) 21 on which electronic components such as a conversion connector are mounted. The ramp loading mechanism 25 has a ramp 80 erected on the bottom wall 12a.

[0034] The actuator assembly 27 includes an actuator block 29 with a through hole, a bearing unit (unit bearing) 28 disposed within the through hole, multiple arms 32 extending from the actuator block 29, for example 11 arms 32, a suspension assembly (sometimes also called a head universal joint assembly: HGA) 30 mounted on each arm 32, and a magnetic head 17 supported on the suspension assembly 30. The actuator block 29 is supported by the bearing unit 28 in a manner that allows it to rotate freely about a support shaft 26 erected on the bottom wall 12a.

[0035] The FPC unit 34 integrally comprises a base portion 34a that is bent into an L-shape and is generally rectangular in shape, an elongated strip-shaped relay portion 34b extending from one side edge of the base portion 34a, and a connecting portion 21c continuously disposed at the front end of the relay portion 34b. The base portion 34a, the relay portion 34b, and the connecting portion 21c are formed of a flexible printed wiring substrate (FPC).

[0036] Electronic components, such as a converter connector (not shown) and multiple capacitors, are mounted on the base portion 34a and are electrically connected to the wiring of the FPC. The base portion 34a is located on the bottom wall 12a of the base 12. A relay portion 34b extends from the side edge of the base portion 34a toward the actuator block 29 of the actuator assembly 27. A joint portion 21c located at the extended end of the relay portion 34b is attached and threadedly fastened to the side surface (mounting surface) of the actuator block 29. A plurality of connection pads are provided in the joint portion 21c. Each magnetic head 17 of the actuator assembly 27 is electrically connected to the connection pads of the joint portion 21c via wiring members.

[0037] A printed circuit board 41 is threaded and fastened to the outer surface of the bottom wall 12a of the substrate 12. The printed circuit board 41 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 34.

[0038] Figure 2 It is along Figure 1 A cross-sectional view of the spindle motor section of the HDD of the EE line.

[0039] As shown in the figure, in one example, the spindle motor 19 has a pivot 48 that is erected approximately vertically on the bottom wall 12a, a generally cylindrical spindle hub 64 that is supported in a manner that allows it to rotate freely around the pivot 48, a stator coil CS that is fixed to the bottom wall 12a and disposed around the pivot 48, and a cylindrical magnet M that is mounted on the inner circumferential surface of the spindle hub 64 and is not opposite to the stator coil CS.

[0040] The base end of the pivot 48 is pressed into and fitted into the through hole 67 formed in the bottom wall 12a.

[0041] The spindle hub 64 has an outer peripheral surface coaxially positioned with the pivot 48 and an annular flange 65 integrally formed at the lower end of the outer peripheral surface (the end on the side of the bottom wall 12a). The flange 65 has an annular disk mounting surface 72 for mounting the disk 18. The lower end of the spindle hub 64 and the flange 65 are, for example, separated by a gap of about 0.4 mm and are opposite to the inner surface of the bottom wall 12a.

[0042] A flexible printed circuit board (FPC) 60 for energizing the spindle motor 19 is bonded and fixed to the outer surface of the bottom wall 12a. A recess 50 of a predetermined shape is formed around the pivot 48 on the outer surface of the bottom wall 12a. A step 54 is formed at the junction of the recess 50 and the outer surface of the bottom wall 12a. The FPC 60 has one end connected to the printed circuit board 41, another end 60b disposed within the recess 50, and a plurality of connection pads 62b disposed on the other end 60b. The connection pads 62b are electrically connected to the wiring of the FPC 60. Leads L from the coil CS of the spindle motor 19 are bonded to the connection pads 62b by solder S. Adhesive AD is filled in the recess 50, covering the connection pads 62b and the solder joints.

[0043] The disk 18 is engaged with the outer peripheral surface of the spindle hub 64 with its inner hole inserted through it. Additionally, an annular spacer ring 66 is fitted onto the outer peripheral surface of the spindle hub 64, clamping between two adjacent disks 18. Multiple disks 18 and multiple spacer rings 66 are sequentially arranged on the flange 65 of the spindle hub 64, mounted in an alternating overlapping manner. The inner peripheral portions of the multiple disks 18 and the spacer rings 66 are pressed towards the flange 65 by a clamping member 20 mounted on the upper end of the spindle hub 64. Thus, ten disks 18 are fixed to the spindle hub 64 in a stacked state with predetermined intervals between them, and are supported in a manner that allows them to rotate integrally with the spindle hub 64. The ten disks 18 are supported parallel to each other and substantially parallel to the bottom wall 12a with predetermined intervals between them.

[0044] The height (thickness) H of the housing 10, including the top cover 16, is formed to a maximum of 26.1 mm according to the 3.5-inch HDD standard. The thickness T of each disk 18 is formed to be 0.35 to 0.635 mm, and in this embodiment, it is set to 0.635 mm. The spacing d between two adjacent disks 18 (equivalent to the thickness of the spacer ring) is formed to be more than 1.2 mm and less than 1.65 mm, and in this embodiment, it is set to 1.484 mm. The overall stacking height h of the disks (the height from the lower surface of the bottom disk to the upper surface of the top disk) is set to 18.356 mm in this embodiment.

[0045] The clamping component 20 will be described in detail below.

[0046] Figure 3 This is a top view of the clamping component. Figure 4 This is a top view of the clamping component installed on the spindle hub. Figure 5 It is along Figure 4 A cross-sectional view of the clamping component of line BB. Figure 6 It is along Figure 4 A cross-sectional view of the clamping component of line AA.

[0047] like Figure 3 As shown, the clamping member 20 has a disk-shaped body 21 with a center (central axis) C. The body 21 has an annular inner hole 21a concentric with the central axis C. The body 21 is, for example, formed of aluminum. Figure 2 As shown, the main body 21 has a generally flat first surface S1 on the side of the top cover 16 and a second surface S2 on the side of the disk 18. The inner peripheral portion of the main body 21 is formed with a plate thickness thicker than the outer peripheral portion, forming an annular fixing part 22A. The outer peripheral portion of the main body 21 forms an annular pressing part 22B with a plate thickness thinner than the fixing part 22A. In the second surface S2, the second surface of the pressing part 22B is formed into an arc shape that slightly protrudes towards the disk 18 side, forming an abutting surface 22C that abuts against the disk 18.

[0048] The outer diameter of the main body 21 (the outer diameter of the pressing part 22B) is larger than the outer diameter of the spindle hub 64 (the inner diameter of the disk 18), while the inner diameter of the pressing part 22B, i.e., the outer diameter of the fixing part 22A, is set smaller than the outer diameter of the spindle hub 64. With the fixing part 22A of the clamping member 20 fixed to the spindle hub 64, the abutting surface 22C of the pressing part 22B abuts against the upper surface of the inner circumference of the disk 18 to perform pressing.

[0049] like Figure 3 and Figure 4As shown, the clamping member 20 has: an annular mounting groove 40 formed in the main body 21 for assembling wires for imbalance adjustment; a plurality of through holes (counter-screw holes) 42 for inserting fixing screws for fixing the clamping member 20; and a plurality of internal threaded holes 44 for engaging adjusting screws for balance adjustment.

[0050] The mounting groove 40 is an annular shape concentric with the central axis C, formed in the pressing part 22B on the first surface S1 of the main body 21, and positioned adjacent to the outer periphery of the main body 21. The diameter of the mounting groove 40 is, for example, about 31 mm.

[0051] Six through holes 42 are formed to pass through the fixing part 22A of the main body 21, and each extends parallel to the central axis C. The six through holes 42 are respectively located at the center of the hole overlapping a circle of radius r, and are evenly spaced apart in the circumferential direction. No threads are cut into the through holes 42. In this embodiment, the radius r is set to 10 mm.

[0052] Six internally threaded holes 44 are formed in the fixing part 22A, each located at a position where the center of the hole overlaps with a circle of radius r. The six internally threaded holes 44 are evenly spaced apart in the circumferential direction, each located between two adjacent through holes 42 in the circumferential direction. Each internally threaded hole 44 is a bottomed hole, open at one end on the first surface S1 of the main body 21 and closed at the other end. Internal threads are cut into the inner circumferential surface of each internally threaded hole 44. For example, the internally threaded holes 44 are designed to be approximately M3 threaded holes.

[0053] like Figure 2 and Figure 4 As shown, the clamping member 20 overlaps the upper end of the spindle hub 64 and is coaxially configured with the spindle hub 64, and is threadedly fixed to the spindle hub 64 by six fixing screws SC. The fixing part 22A of the clamping member 20 is fitted into a recess provided in the spindle hub 64. Figure 5 As shown, the fixing screw SC is inserted through the through hole 42 from the first surface S1 side and screwed into the threaded hole 74 of the spindle hub 64. Thus, the fixing part 22A of the clamping member 20 is fixed to the spindle hub 64, and the abutting surface 22C of the pressing part 22B abuts against the inner periphery of the uppermost disk 18, clamping the disk 18 and the spacer ring 66.

[0054] When adjusting the imbalance of rotating bodies such as disk 18 and spacer ring 66, an adjustment wire W is fitted into the mounting slot 40 of clamping member 20. The wire W can be, for example, made of stainless steel (SUS304) with a diameter of 0.65 mm. The wire W is positioned in the mounting slot 40 and fixed to the main body 21 by its own outward restoring force. The amount of imbalance correction can be adjusted by the length of the wire W.

[0055] By adjusting its length, the wire W can mitigate imbalances of up to approximately 1.1 gmm. As mentioned above, in an HDD consisting of 10 disks stacked in 18 layers (0.635 mm thick, 96 mm diameter), the imbalance of the rotating parts can sometimes exceed 1.1 gmm. In such cases, the wire W cannot completely correct the imbalance. To enable imbalance correction across all HDDs, an imbalance correction capability of approximately 1.8 gmm is required.

[0056] Therefore, when the imbalance of the rotating body exceeds 1.1 gmm, such as Figure 4 and Figure 6 As shown, an adjusting screw SA for imbalance adjustment is screwed into the internal threaded hole 44 of the clamping member 20. For example, if the screw SA is made of brass, its weight is approximately 0.1g. When this screw SA is fitted into the internal threaded hole 44 located at a radius r = 10mm, the imbalance caused by the adjusting screw SA is 0.1 × 10 = 1gmm. By combining the wire W and the adjusting screw SA, an imbalance correction of approximately 2.1gmm can be achieved. In this embodiment, a headless set screw (headless screw) is used as the adjusting screw SA.

[0057] Furthermore, the adjusting screw SA is only screwed into the fixing part 22A of the clamping member 20 and does not reach the main shaft hub 64 of the motor. Therefore, the screw SA does not affect the clamping force of the clamping member 20. In addition, the internal threaded hole 44 is a bottomed hole (not a through hole), which prevents wear powder from flying outside the threaded hole when assembling the screw.

[0058] In situations where it is difficult to design a non-through hole to ensure thread length, for example, Figure 7 As shown, the internal threaded hole 44 can also be a through hole. That is, it can also be configured as follows: the internal threaded hole 44 is formed by a through hole that passes through the main body 21 and an internal thread cut into the inner circumferential surface of the through hole, and the lower opening of the internal threaded hole 44 is sealed by a sealing member 45 attached to the second surface S2 of the clamping member 20.

[0059] Next, an example of an imbalance correction method will be described.

[0060] Figure 8 This is a flowchart illustrating an example of an imbalance correction method.

[0061] As shown in the figure, firstly, the disk 18 and the spacer ring 66 are assembled on the spindle hub 64 of the spindle motor 19. After they are stacked on the flange 65, the clamping member 20 is stacked on the upper end of the spindle hub 64. The clamping member 20 is fastened to the spindle hub 64 using 6 fixing screws SC (ST1).

[0062] Next, the initial imbalance measurement (ST2) is performed. Details of the imbalance measurement method are omitted, but it is possible to measure the rotational synchronization component of the acceleration generated in the housing due to the rotation of the motor, and determine the direction and magnitude of the imbalance of the rotating body based on the maximum value of the acceleration and the phase at which the maximum value is taken.

[0063] Determine whether the measured initial imbalance value is 1.1 gmm or more (ST3). If it is less than 1.1 gmm, the imbalance can be corrected simply by adding wire W. Therefore, assemble a wire W of appropriate length into the mounting slot 40 of the clamp 20 in the appropriate direction to complete the correction (ST6).

[0064] If the initial imbalance value exceeds 1.1 gmm, screw the imbalance adjustment screw SA (ST4) into the internal threaded hole 44, which is 180° away from the imbalance direction relative to the central axis C.

[0065] When the assembly position of the adjusting screw SA is completely consistent with the unbalance direction +180°, the unbalance correction effect based on the adjusting screw SA is maximized. However, since there are only 6 assembly positions of the adjusting screw, i.e., the internal threaded hole 44, there may be a deviation of up to 30° relative to the ideal direction.

[0066] Figure 9 This is a schematic diagram illustrating the initial imbalance, the imbalance based on the adjusting screw, and the balance state based on the wire imbalance. (Example) Figure 9 As shown in (a), when the adjusting screw SA is positioned on a straight line passing through the central axis C and in the same direction as the initial imbalance, the imbalance correction effect based on the adjusting screw SA is the greatest, and when combined with the wire-based correction capability of 1.1 gmm, it can correct an initial imbalance of 2.1 gmm. Furthermore, as... Figure 9 As shown in (b), even when the adjusting screw SA is positioned off the line from the initial unbalance direction, it is possible to correct the initial unbalance up to 1.84 gmm, which greatly improves the correction capability compared to the case of unbalance correction by wire W individual.

[0067] like Figure 8 As shown, if the balance correction is insufficient by simply adjusting the screw SA, the appropriate length of wire W is assembled into the mounting slot 40 of the clamp 20 in the appropriate direction, and the correction is completed (ST5).

[0068] According to the first embodiment of the HDD and disk clamping member configured as described above, by providing threaded holes in the clamping member for mounting adjusting screws different from the fixing screws used to fix the clamping member, and using adjusting screws and wire together, the range of unbalance correction for the rotating body can be expanded. Since the threaded holes are formed in the clamping member itself, the adjusting screws mounted in the threaded holes do not affect the fastening force of the disk. Therefore, even when adjusting screws are mounted, the disk can be clamped evenly using the clamping member. At the same time, without increasing the diameter of the correction wire and the mounting groove for mounting the wire, the range of unbalance correction can be expanded without increasing the plate thickness of the clamping member. Moreover, by expanding the range of unbalance correction, even devices with large imbalances that previously required disassembly and reassembly can be balanced, thus improving the manufacturing yield of the device.

[0069] According to the first embodiment, a disc clamping member and a disc device can be obtained that can easily adjust the imbalance of the rotating body and improve the yield of the device.

[0070] Furthermore, in the first embodiment, the number of through holes 42 and internal threaded holes 44 in the clamping member 20 is not limited to six, and can be increased or decreased as needed. Additionally, the number of through holes 42 and the number of internal threaded holes 44 are not limited to the same, and one type of hole can have more or fewer holes than the other. The adjusting screw SA is not limited to a set screw, and other types of screws can also be used. The forming material of the adjusting screw SA is not limited to brass, and can also be other materials, such as stainless steel.

[0071] Next, the clamping member of the HDD according to other embodiments of the present invention will be described. In the other embodiments described below, the same reference numerals are used to refer to the parts that are the same as those in the first embodiment described above, and detailed descriptions are omitted or simplified. The description focuses on the parts that are different from those in the first embodiment.

[0072] (Second Implementation)

[0073] Figure 10 This is a top view of the disk clamping member in the HDD according to the second embodiment. Figure 11 This is a top view of the disc clamping component installed on the spindle hub. Figure 12 This is a perspective view showing the disc clamping components before and after installation of the washers and adjusting screws. Figure 13 This is a top view showing the washer and adjusting screw enlarged.

[0074] like Figure 10 and Figure 11As shown, according to the second embodiment, the clamping member 20 has six through holes 42 through which fixing screws SC are inserted, and six internal threaded holes 47 formed between two through holes 42 for screwing in adjusting screws SA. It also has six oblong recesses (counter-hole portions) 46 formed in the regions including each internal threaded hole 47. The through holes 42 and threaded holes 47 are arranged such that their centers are located on a circle of radius r, and are equally spaced apart in the circumferential direction. The recesses 46 are formed on the first surface S1 of the clamping member 20 and extend radially relative to the central axis C.

[0075] The clamping member 20 includes an elongated washer SW capable of being inserted into the recess 46. The washer SW is formed, for example, from stainless steel and has an elongated inner hole.

[0076] Furthermore, when using a thin washer SW, the recess 46 of the clamping body can be omitted.

[0077] like Figure 12 As shown in (a) and (b), with the washer SW fitted into the recess 46, the adjusting screw SA is screwed through the inner hole of the washer SW into the internal threaded hole 47, thereby clamping and fixing the washer SW between the adjusting screw SA and the clamping member 20. Furthermore, in the second embodiment, the adjusting screw SA is a conventional screw with a head. Thus, the washer SW is clamped between the head of the adjusting screw SA and the clamping member 20.

[0078] By installing washers SW in addition to adjusting screws SA, the range of imbalance correction can be further expanded.

[0079] The washer SW and its inner hole are oblong, allowing the washer SW to be moved radially within the recess 46 and its position adjusted. By adjusting the radius of the washer SW, the imbalance correction amount (adjustment amount) based on the washer SW can be fine-tuned.

[0080] like Figure 13 As shown in (a), the further the washer SW is located radially outward, the greater the imbalance adjustment. Figure 13 As shown in (b), the closer the washer SW is to the radial inner side, the smaller the imbalance adjustment.

[0081] In the second embodiment, the other structures of the HDD are the same as those of the HDD in the first embodiment described above.

[0082] According to the second embodiment configured as described above, by enabling the adjusting screw SA and washer SW to be mounted on the clamping member 20, the range of imbalance that can be corrected for the rotating body can be further expanded, and a larger imbalance can be corrected. Thus, a disc clamping member and disc device that can easily adjust the imbalance of the rotating body and improve the yield of the device can be obtained.

[0083] This invention is not limited to the embodiments described above. During implementation, the constituent elements can be modified and embodied by variations without departing from its spirit. Furthermore, various inventions can be formed through appropriate combinations of the multiple constituent elements disclosed in the above embodiments. For example, some constituent elements may be deleted from all the constituent elements shown in the embodiments. Moreover, constituent elements from different embodiments can be appropriately combined.

[0084] In the above embodiments, the clamping member is not limited to aluminum; for example, it can also be stainless steel. The number of disks is not limited to 10; it can be 9 or less or 11 or more. The thickness of the disk is not limited to 0.635 mm or 0.5 mm; it can be varied as needed. Similarly, the diameter of the disk is not limited to 96 mm; for example, it can be 95 mm or 97 mm. The substrate of the disk is not limited to aluminum; it can also be glass, etc. The spacer ring is not limited to aluminum; for example, it can be titanium, stainless steel, glass, etc. Furthermore, the adjusting screw is not limited to brass; for example, it can also be stainless steel.

Claims

1. A disc clamping member, comprising: The main body is disc-shaped and has a central axis; An annular assembly groove is provided on the first surface of the main body, which can be filled with wire for imbalance adjustment; Multiple through holes are formed through the main body, and are evenly spaced around the central axis of the main body in the circumferential direction, each allowing a fixing screw to be inserted; and Multiple internally threaded holes are formed on the first surface of the main body and are evenly spaced apart in the circumferential direction, each capable of engaging with an adjusting screw for balance adjustment. The adjusting screw can be screwed into the internal threaded hole via a washer disposed on the first surface of the body. The washer can be displaced radially in the body to be fixed to the body by the adjusting screw in any radial position.

2. The disc clamping member according to claim 1, The plurality of internal threaded holes are respectively disposed between two adjacent through holes in the circumferential direction.

3. The disc clamping member according to claim 2, The plurality of through holes and the plurality of internal threaded holes are arranged on the same circle centered on the central axis.

4. The disc clamping member according to claim 3, The number of the plurality of through holes is the same as the number of the plurality of internal threaded holes.

5. The disc clamping member according to claim 1, The internally threaded hole has a bottomed hole that opens on the first surface of the body and an internal thread formed by cutting the inner circumferential surface of the bottomed hole.

6. The disc clamping member according to claim 1, The internally threaded hole has a through hole through which the body is formed and an internal thread formed on the inner circumferential surface of the through hole. A sealing element is attached to the second surface of the body, which blocks the opening on the second surface side of the through hole.

7. A disk device comprising: The housing has the height specified by the 3.5-inch disk device standard; A spindle motor having a spindle hub that is rotatably supported and disposed within the housing; Ten or more disks are mounted on the spindle hub; and The disk clamping member according to any one of claims 1 to 6 is fixed to the spindle hub and clamps the disk.

8. The disk device according to claim 7, Ten or more disks, each 0.635 mm thick and 3.5 inches in diameter, are stacked on the flange of the spindle hub and supported by the spindle hub.

9. The disk device according to claim 7, The shell is sealed with a low-density gas that is less dense than air.

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