Disk device

Abstract

The present disclosure provides a disk device that can suppress the difficulty of manufacturing a slope even if the protrusion is set to be thin. A disk device of one embodiment includes a magnetic disk, a magnetic head, a slope and a suspension. The suspension has a sliding portion arranged on a load beam, and rotates around a second rotation axis between a loading position and an unloading position. The slope has a wall and a protrusion. The wall has a first supporting surface that supports the sliding portion when the suspension is located at the unloading position. The protrusion has a second supporting surface facing the magnetic head when the suspension is located at the unloading position and an intermediate portion arranged between the wall and the second supporting surface. The intermediate portion has a first portion and a second portion that is located between the first portion and the first supporting surface in the axial direction of the first rotation axis and in the radial direction of the second rotation axis.

Description

[0001] This application claims priority based on Japanese Patent Application No. 2021-154721 (filing date: September 22, 2021), and the present application incorporates all the contents of the basic application by reference. Technical Field

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

[0003] A disk device such as a hard disk drive (HDD) includes, for example, a magnetic disk, a magnetic head, a suspension, and a ramp. The magnetic head is held by the suspension. The suspension rotates between a loading position where the magnetic head is located on the surface of the magnetic disk and an unloading position where the suspension is held by the ramp.

[0004] The slope has, for example, a wall and a protrusion that protrudes from the wall and is disposed between the two magnetic heads at the unloading position. The protrusion prevents the two magnetic heads from abutting against each other. Summary of the invention

[0005] If the number of magnetic disks in a disk device increases, the interval between adjacent magnetic disks generally becomes shorter. If the thickness of the protrusion is set thin according to the interval, it may become difficult to manufacture the slope.

[0006] One example of the problem to be solved by the present invention is to provide a disk device capable of preventing the difficulty in manufacturing the slope even when the protrusion is set to be thin.

[0007] A disk device according to one embodiment includes a plurality of magnetic disks, a magnetic head, a ramp, and a suspension. The magnetic disks each have a recording surface and can rotate around a first rotation axis intersecting the recording surface. The magnetic head is configured to read and write information on the recording surface. The ramp is spaced apart from the first rotation axis. The suspension includes a load beam extending in the radial direction of a second rotation axis, a sliding portion provided at an end of the load beam on the radially outer side of the second rotation axis, a flexure mounted on the load beam, and a holding portion provided on the flexure between the sliding portion and the second rotation axis in the radial direction of the second rotation axis and holding the magnetic head, and is configured to rotate around the second rotation axis between a loading position where the sliding portion is spaced apart from the ramp and the magnetic head is located on the recording surface and an unloading position where the sliding portion is held on the ramp. The ramp includes a wall and a protrusion protruding from the wall to the radially inner side of the second rotation axis. The wall includes a first supporting surface for supporting the sliding portion when the suspension is located at the unloading position. The protrusion has a second supporting surface which is spaced apart from the first supporting surface in the axial direction of the first rotating shaft and faces the magnetic head when the suspension is located at the unloading position, and an intermediate portion which is arranged between the wall and the second supporting surface in the radial direction of the second rotating shaft. When the suspension is located at the unloading position, in the axial direction of the first rotating shaft, the distance between the end of the flexure on the radial outer side of the second rotating shaft and the protrusion is longer than the distance between the magnetic head and the second supporting surface. The intermediate portion has a first portion which is located between the first supporting surface and the second supporting surface in the axial direction of the first rotating shaft, and a second portion which is located between the first portion and the first supporting surface in the axial direction of the first rotating shaft and between the first portion and the first supporting surface in the radial direction of the second rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is an illustrative perspective view showing a hard disk drive (HDD) according to one embodiment.

[0009] Figure 2 1 is an illustrative cross-sectional view showing a portion of the actuator assembly and a portion of the ramp loading mechanism according to the above embodiment.

[0010] Figure 3 It is an exemplary perspective view showing the ramp loading mechanism of the above embodiment.

[0011] Figure 4 This is an exemplary cross-sectional view showing a part of the suspension and a part of the slope according to the above embodiment.

[0012] Description of Reference Numerals

[0013] 10 ... hard disk drive (HDD), 12 ... magnetic disk, 12a ... recording surface, 14 ... magnetic head, 14b ... inflow end, 14c ... outflow end, 37 ... head suspension assembly (suspension), 42 ... load beam, 43 ... flexure, 43a ... end, 45 ... lifting tab, 46 ... universal joint, 53 ... ramp, 61 ... lifter, 62 ... limiter, 71 ... holding surface, 71a ... end edge, 81 ... end surface, 82…supporting surface, 82a, 82b…end edge, 83…supporting surface, 84…middle part, 87…inclined surface, 87a…end edge, 88…inclined surface, Ax1…first rotation axis, Ax2…second rotation axis, Do…outer direction, Di…inner direction, P1…first part, P2…second part, L1…interval, L2…length, L3…thickness, L4~L9…distance, θ…angle, VP…imaginary surface. DETAILED DESCRIPTION

[0014] Hereinafter, regarding one embodiment, refer to Figure 1 to Figure 4 In addition, in this specification, the constituent elements of the implementation mode and the description of the element are sometimes recorded using multiple expressions. The constituent elements and their descriptions are examples and are not limited by the descriptions in this specification. The constituent elements can also be identified by names different from the names in this specification. In addition, the constituent elements can also be described by expressions different from the descriptions in this specification.

[0015] Figure 1 1 is an illustrative perspective view showing a hard disk drive (HDD) 10 according to one embodiment. The HDD 10 is an example of a disk device, and can also be called an electronic device, a storage device, an external storage device, or a magnetic disk device.

[0016] As shown in the drawings, in this specification, an X-axis, a Y-axis, and a Z-axis are defined for convenience. The X-axis, the Y-axis, and the Z-axis are orthogonal to each other. The X-axis is set along the width of the HDD 10. The Y-axis is set along the length of the HDD 10. The Z-axis is set along the thickness of the HDD 10.

[0017] In addition, in this specification, the X direction, the Y direction, and the Z direction are defined. The X direction is a direction along the X axis, including the +X direction indicated by the arrow of the X axis and the -X direction which is the opposite direction of the arrow of the X axis. The Y direction is a direction along the Y axis, including the +Y direction indicated by the arrow of the Y axis and the -Y direction which is the opposite direction of the arrow of the Y axis. The Z direction is a direction along the Z axis, including the +Z direction indicated by the arrow of the Z axis and the -Z direction which is the opposite direction of the arrow of the Z axis.

[0018] like Figure 1As shown, HDD 10 has housing 11, multiple magnetic disks 12, spindle motor 13, multiple magnetic heads 14, actuator assembly 15, voice coil motor (VCM) 16, ramp loading mechanism 17, and flexible printed wiring board (FPC) 18. Magnetic head 14 can also be called a slider.

[0019] The housing 11 is formed in a substantially rectangular box shape extending in the Y direction and open in the +Z direction. The housing 11 has a bottom wall 21 and a peripheral wall 22. The bottom wall 21 is formed in a substantially rectangular (quadrilateral) plate shape extending along the XY plane. The peripheral wall 22 protrudes from the edge of the bottom wall 21 in the substantially +Z direction and is formed in a substantially rectangular frame shape. The bottom wall 21 and the peripheral wall 22 are made of a metal material such as an aluminum alloy and are formed integrally.

[0020] An inner chamber 25 opened in the +Z direction is provided inside the housing 11. The inner chamber 25 is formed (defined, partitioned) by, for example, a bottom wall 21 and a peripheral wall 22. Therefore, the peripheral wall 22 surrounds the inner chamber 25. The inner chamber 25 is sealed substantially airtightly by, for example, a cover attached to the housing 11.

[0021] A gas different from air is filled in the inner chamber 25. For example, a low-density gas having a lower density than air, an inert gas having a low reactivity, etc. are filled in the inner chamber 25. In the present embodiment, helium is filled in the inner chamber 25. In addition, other fluids may be filled in the inner chamber 25. In addition, the inner chamber 25 may be maintained at a vacuum, a low pressure close to a vacuum, or a negative pressure lower than the atmospheric pressure.

[0022] The plurality of magnetic disks 12 are formed in a disk shape extending along the XY plane. The diameter of the magnetic disk 12 is, for example, 3 to 4 inches. In the present embodiment, the diameter of the magnetic disk 12 is about 3.5 inches. In addition, the diameter of the magnetic disk 12 is not limited to this example. The plurality of magnetic disks 12 each have, for example, at least one recording surface 12a and an outer edge 12b.

[0023] The recording surface 12a is provided on at least one of the upper surface and the lower surface of the magnetic disk 12. In other words, the plurality of recording surfaces 12a are surfaces of the magnetic disk 12 facing substantially in the +Z direction or surfaces of the magnetic disk 12 facing substantially in the -Z direction.

[0024] The recording surface 12a is a substantially flat surface extending along the XY plane. The magnetic recording layer of the magnetic disk 12 is provided on the recording surface 12a. In addition, the magnetic recording layer may not be provided on a part of the recording surface 12a. The outer edge 12b is the outer peripheral surface of the magnetic disk 12.

[0025] The plurality of magnetic disks 12 are stacked at intervals in the Z direction. The spindle motor 13 has a hub that supports the plurality of magnetic disks 12. The plurality of magnetic disks 12 are held by the hub of the spindle motor 13 by, for example, a clamp spring.

[0026] Figure 21 is an exemplary cross-sectional view showing a part of the actuator assembly 15 and a part of the ramp loading mechanism 17 of the present embodiment. In the present embodiment, the HDD 10 has more than 10 magnetic disks 12. Figure 2 Schematically, the interval L1 between the plurality of magnetic disks 12 is 1.482 mm or less and longer than 0 mm. In the present embodiment, the interval L1 is approximately 1.482 mm. The number of magnetic disks 12 and the interval L1 are not limited to this example.

[0027] Figure 1 The spindle motor 13 rotates the plurality of magnetic disks 12 about a first rotation axis Ax1. The first rotation axis Ax1 is a virtual axis extending substantially in the Z direction. That is, the first rotation axis Ax1 extends in a direction perpendicular to (intersecting) the recording surface 12a.

[0028] The first rotation axis Ax1 is the rotation center of the spindle motor 13 and is also the central axis of the disk 12 and the hub of the spindle motor 13. The central axis of the disk 12 and the hub of the spindle motor 13 may be different from the rotation center of the spindle motor 13.

[0029] The magnetic head 14 records and reproduces information on the recording surface 12a of the magnetic disk 12. In other words, the magnetic head 14 reads and writes information on the recording surface 12a of the magnetic disk 12. The magnetic head 14 is mounted on the actuator assembly 15.

[0030] The actuator assembly 15 is rotatably supported by a support shaft 31 disposed at a position spaced apart from the magnetic disk 12. The support shaft 31 extends from the bottom wall 21 of the housing 11 in a substantially +Z direction, for example.

[0031] The actuator assembly 15 can rotate around a second rotation axis Ax2 spaced apart from the first rotation axis Ax1. The second rotation axis Ax2 is an imaginary axis extending substantially in the Z direction. Therefore, the first rotation axis Ax1 and the second rotation axis Ax2 are arranged substantially in parallel. The second rotation axis Ax2 is, for example, the center of rotation of the actuator assembly 15 and is also the central axis of the support shaft 31.

[0032] In this specification, the axial direction, radial direction, and circumferential direction are defined. The axial direction is a direction along an imaginary axis such as the first rotation axis Ax1 and the second rotation axis Ax2, including one direction and another direction along the axis. The radial direction is a direction orthogonal to the axis, including multiple directions orthogonal to the axis. The circumferential direction is a direction rotating around the axis, including a clockwise direction and a counterclockwise direction rotating around the axis.

[0033] As described above, the first rotation axis Ax1 and the second rotation axis Ax2 extend substantially in parallel in the Z direction and are spaced apart from each other. That is, the axial direction of the first rotation axis Ax1 and the axial direction of the second rotation axis Ax2 are the Z direction. The first rotation axis Ax1 is spaced apart from the second rotation axis Ax2 in the radial direction of the second rotation axis Ax2.

[0034] The VCM 16 rotates the actuator assembly 15 around the second rotation axis Ax2 and places the actuator assembly 15 at a desired position. If the magnetic head 14 moves to the outermost periphery of the magnetic disk 12 by the rotation of the actuator assembly 15 realized by the VCM 16, the ramp loading mechanism 17 holds the magnetic head 14 at a position spaced apart from the magnetic disk 12.

[0035] The actuator assembly 15 has an actuator block 35, a plurality of arms 36, and a plurality of head suspension assemblies (suspensions) 37. The suspension 37 can also be referred to as a head gimbal assembly (HGA).

[0036] The actuator block 35 is rotatably supported on the support shaft 31 via a bearing, for example. A plurality of arms 36 protrude from the actuator block 35 in the radial direction of the second rotation axis Ax2. Alternatively, the actuator assembly 15 may be divided, and the arms 36 may protrude from each of the plurality of actuator blocks 35.

[0037] The arms 36 are arranged at intervals in the axial direction of the second rotation axis Ax2. Each of the arms 36 is formed in a plate shape that can enter a gap between adjacent magnetic disks 12. The arms 36 extend substantially in parallel.

[0038] The actuator block 35 and the plurality of arms 36 are integrally formed of, for example, aluminum. In addition, the materials of the actuator block 35 and the arms 36 are not limited to this example.

[0039] The voice coil of the VCM 16 is provided on a protrusion protruding from the actuator block 35 to the opposite side of the arm 36. The VCM 16 includes a pair of yokes, a voice coil disposed between the yokes, and a magnet provided on the yokes.

[0040] As described above, the VCM 16 rotates the actuator assembly 15 around the second rotation axis Ax2. In other words, the VCM 16 rotates (moves) the actuator block 35, the arm 36, and the suspension 37 around the second rotation axis Ax2 in an integrated manner.

[0041] The suspension 37 is attached to the front end portion of the corresponding arm 36 and protrudes from the arm 36. Thus, the plurality of suspensions 37 are arranged at intervals in the axial direction of the second rotation axis Ax2. Each of the plurality of suspensions 37 includes a substrate 41, a load beam 42, and a flexure 43.

[0042] The substrate 41 and the load beam 42 are made of, for example, stainless steel. Alternatively, the substrate 41 and the load beam 42 may be made of other materials or may be made of different materials.

[0043] The base plate 41 is formed in a plate shape and attached to the front end of the arm 36. The load beam 42 is attached to the front end of the base plate 41 and protrudes in the radial direction of the second rotation axis Ax2 from the base plate 41. In other words, the load beam 42 extends in the radial direction of the second rotation axis Ax2.

[0044] The load beam 42 is thinner than the substrate 41 and is formed in a plate shape extending along the XY plane. That is, the load beam 42 is supported on the substrate 41 in a cantilever beam shape and can be bent with one end attached to the substrate 41 as a fulcrum.

[0045] like Figure 2 As shown, an inner direction Di and an outer direction Do are defined. The inner direction Di and the outer direction Do are included in the radial direction. The inner direction Di is an example of the inner side of the radial direction of the second rotation axis. The outer direction Do is an example of the outer side of the radial direction of the second rotation axis. The inner direction Di is a direction orthogonal to the second rotation axis Ax2 and toward the second rotation axis Ax2. The outer direction Do is the opposite direction of the inner direction Di.

[0046] The load beam 42 has a lift tab 45. The lift tab 45 is an example of a sliding portion. The lift tab 45 is provided at the end of the load beam 42 in the outer direction Do. In addition, the lift tab 45 is located at the end of the actuator assembly 15 in the outer direction Do. Therefore, the lift tab 45 is spaced apart from the second rotation axis Ax2 in the radial direction of the second rotation axis Ax2.

[0047] The flexible member 43 is formed in a long and narrow strip shape. The shape of the flexible member 43 is not limited to this example. The flexible member 43 is, for example, a laminated plate having a metal plate (lining layer) such as stainless steel, an insulating layer formed on the metal plate, a conductive layer formed on the insulating layer and having a plurality of wirings (wiring patterns), and a protective layer (insulating layer) covering the conductive layer.

[0048] The flexure 43 is attached to the substrate 41 and the load beam 42. The flexure 43 includes a gimbal portion (elastic support portion) 46 located on the load beam 42, a first mounting portion 47, and a second mounting portion 48. The gimbal portion 46 is an example of a holding portion.

[0049] The gimbal portion 46 is located between the load beam 42 and the corresponding recording surface 12a of the magnetic disk 12 in the Z direction. The magnetic head 14 is mounted on the gimbal portion 46. In other words, the gimbal portion 46 holds the magnetic head 14. The flexure 43 is electrically connected to the magnetic head 14.

[0050] The gimbal portion 46 is supported, for example, by a substantially hemispherical protrusion 49 provided on the load beam 42 in a displaceable and swingable manner. Therefore, the magnetic head 14 can be displaced and swung together with the gimbal portion 46 .

[0051] The gimbal portion 46 is provided on the flexure 43 between the lifting protrusion 45 and the second rotation axis Ax2 in the radial direction of the second rotation axis Ax2. Therefore, the magnetic head 14 is also located between the lifting protrusion 45 and the second rotation axis Ax2 in the radial direction of the second rotation axis Ax2.

[0052] If the load beam 42 is bent so that the lifting tab 45 is displaced in the Z direction, the universal joint portion 46 and the magnetic head 14 are also displaced in the Z direction. In addition, the displacement of the universal joint portion 46 and the magnetic head 14 may not completely follow the displacement of the lifting tab 45. For example, the displacement of the universal joint portion 46 and the magnetic head 14 may also be generated with a delay relative to the displacement of the lifting tab 45. In addition, for example, when the lifting tab 45 is displaced within a predetermined range, the displacement of the universal joint portion 46 and the magnetic head 14 may not be generated.

[0053] The first mounting portion 47 is located between the universal joint portion 46 and the second rotation axis Ax2 in the radial direction of the second rotation axis Ax2. The second mounting portion 48 is located between the lifting protrusion 45 and the universal joint portion 46 in the radial direction of the second rotation axis Ax2. The first mounting portion 47 and the second mounting portion 48 are attached to the load beam 42, for example, by an adhesive.

[0054] Figure 1 One end of the FPC 18 is connected to the flexible member 43. The other end of the FPC 18 is connected to a substrate arranged outside the housing 11, for example, via a connector provided on the housing 11. The substrate is equipped with, for example, a controller for controlling the entirety of the HDD 10 and an interface connector connected to the host. The substrate is electrically connected to the magnetic head 14 via the FPC 18 and the flexible member 43.

[0055] The ramp load mechanism 17 is disposed at a position spaced apart from the first rotation axis Ax1 in the radial direction of the first rotation axis Ax1. Furthermore, the ramp load mechanism 17 is spaced apart from the second rotation axis Ax2 in the radial direction of the second rotation axis Ax2.

[0056] Figure 3 FIG. 1 is an exemplary perspective view showing the slope loading mechanism 17 of the present embodiment. Figure 3 As shown, the ramp loading mechanism 17 has a base 51 , a mounting portion 52 and a plurality of ramps 53 .

[0057] The base 51, the mounting portion 52, and the slope 53 are integrally formed of a synthetic resin such as polyoxymethylene (POM). Alternatively, the base 51, the mounting portion 52, and the slope 53 may be formed separately.

[0058] The base 51 is formed in a generally plate-like shape extending in the circumferential direction of the second rotation axis Ax2. The base 51 has a side surface 51a. The side surface 51a extends in the circumferential direction of the second rotation axis Ax2 toward the inner direction Di. The mounting portion 52 protrudes from the base 51 in the outer direction Do, and is mounted on the bottom wall 21 of the housing 11, for example.

[0059] A plurality of slopes 53 protrude inwardly from the side surface 51a of the base 51. The plurality of slopes 53 are respectively provided corresponding to two magnetic heads 14 for reading and writing information on two recording surfaces 12a of one magnetic disk 12 and two actuator assemblies 15 for moving the magnetic heads 14. Thus, the plurality of slopes 53 are arranged at intervals in the Z direction.

[0060] The slope 53 is located near the outer edge 12b of the corresponding magnetic disk 12. The outer edge 12b of the magnetic disk 12 is inserted into the groove 55 provided in the slope 53, for example. Therefore, the slope 53 covers a part of the recording surface 12a of the corresponding magnetic disk 12.

[0061] The slope 53 has a lifter 61 and a limiter 62. The lifter 61 is an example of a wall. The limiter 62 is an example of a protrusion. The lifter 61 protrudes from the side surface 51a of the base 51 in the inner direction Di. Figure 2 As shown, the lifter 61 has two holding surfaces 71 and 72 and a side surface 73. The holding surface 71 is an example of a first supporting surface.

[0062] The holding surface 71 extends in the circumferential direction of the second rotation axis Ax2 and faces the approximately +Z direction. The holding surface 72 is located on the opposite side of the holding surface 71 and faces the approximately -Z direction. The side surface 73 extends between the end edge 71a of the holding surface 71 in the inner direction Di and the end edge 72a of the holding surface 72 in the inner direction Di. The side surface 73 extends in the circumferential direction of the second rotation axis Ax2 and faces the inner direction Di. In addition, the holding surfaces 71, 72 and the side surface 73 are not limited to this example.

[0063] The holding surfaces 71 and 72 can support the lifting protrusion 45 at a position spaced apart from the outer edge 12b in the radial direction of the first rotation axis Ax1. Alternatively, the holding surfaces 71 and 72 can hold the lifting protrusion 45 inside the outer edge 12b in the radial direction of the first rotation axis Ax1.

[0064] When the magnetic head 14 does not read or write information to the magnetic disk 12 (unloading), as described above, the lifting tab 45 is supported by the holding surface 71 or the holding surface 72 of the slope 53. In other words, when unloading, the lifting tab 45 is arranged at a position spaced apart from the outer edge 12b of the magnetic disk 12 in the radial direction of the first rotation axis Ax1. In addition, the lifting tab 45 during unloading may also be located on the inner side of the outer edge 12b in the radial direction of the first rotation axis Ax1. In other words, the lifting tab 45 during unloading may also overlap with the recording surface 12a in the axial direction (Z direction) of the first rotation axis Ax1.

[0065] On the other hand, when the magnetic head 14 reads and writes information to the magnetic disk 12 (during loading), the lifting tab 45 is basically located on the recording surface 12a of the magnetic disk 12 together with the magnetic head 14. In other words, during loading, the recording surface 12a faces the lifting tab 45 with a gap therebetween. In addition, during loading, at least a portion of the lifting tab 45 may be arranged at a position spaced apart from the recording surface 12a in the radial direction of the first rotation axis Ax1.

[0066] The lifting tab 45 moves between the area on the recording surface 12a and the position (home position) held on the holding surface 71 or the holding surface 72 according to the rotation of the actuator assembly 15. When the lifting tab 45 is held on the holding surface 71 or the holding surface 72, the magnetic head 14 is spaced apart from the recording surface 12a of the magnetic disk 12 in the Z direction and in the radial direction of the first rotation axis Ax1. In addition, when the lifting tab 45 is held on the holding surface 71 or the holding surface 72, the magnetic head 14 may also overlap with the recording surface 12a in the Z direction.

[0067] The lifting tab 45 moves (rotates) around the second rotation axis Ax2 according to the rotation of the actuator assembly 15. In the present embodiment, the moving direction of the lifting tab 45 is substantially along the radial direction of the first rotation axis Ax1. Therefore, the lifting tab 45 can move substantially in the radial direction of the first rotation axis Ax1 according to the rotation of the actuator assembly 15.

[0068] Specifically, the lifting and lowering protrusion 45 can move in the circumferential direction of the second rotation axis Ax2 (radial direction of the first rotation axis Ax1) between the vicinity of the first rotation axis Ax1 and a position on the holding surface 71 or the holding surface 72. That is, the lifting and lowering protrusion 45 can move in the circumferential direction of the second rotation axis Ax2 in a direction approaching the first rotation axis Ax1 and away from the holding surface 71 or the holding surface 72 and in a direction away from the first rotation axis Ax1 and approaching the holding surface 71 or the holding surface 72.

[0069] The actuator assembly 15 including the suspension 37 is rotatable around the second rotation axis Ax2 between a loading position and an unloading position. The loading position and the unloading position are angles (positions) around the second rotation axis Ax2.

[0070] During loading, the suspension 37 is located at the loading position. That is, when the suspension 37 is located at the loading position, the magnetic head 14 is located on the recording surface 12a of the magnetic disk 12, and the lifting tab 45 is spaced apart from the holding surfaces 71 and 72. In addition, in the following description, the position of the magnetic head 14 around the second rotation axis Ax2 when the suspension 37 is located at the loading position can also be referred to as the loading position. In addition, the loading position is not limited to one position, and includes a plurality of positions where the magnetic head 14 is located on the recording surface 12a.

[0071] On the other hand, when unloading, the suspension 37 is located at the unloading position. That is, when the suspension 37 is located at the unloading position, the lifting tab 45 is held on the holding surface 71 or the holding surface 72 of the slope 53 so that the magnetic head 14 is spaced from the recording surface 12a. At the unloading position, the lifting tab 45 can also be embedded in the recessed portion provided on the holding surfaces 71 and 72, and the movement is restricted by the slope 53. In addition, in the following description, the position of the magnetic head 14 around the second rotation axis Ax2 when the suspension 37 is located at the unloading position can also be referred to as the unloading position.

[0072] The magnetic head 14 at the unloading position is spaced apart from the recording surface 12a in the Z direction. A gap may also be generated between the magnetic head 14 at the loading position and the recording surface 12a. However, in the Z direction, the magnetic head 14 at the unloading position is farther away from the recording surface 12a than the magnetic head 14 at the loading position.

[0073] like Figure 3 As shown, the stopper 62 protrudes inwardly in the direction Di from the side surface 73 of the lifter 61. In the Z direction, the stopper 62 is located substantially in the center of the two holding surfaces 71, 72 of the lifter 61. In addition, the position of the stopper 62 is not limited to this example.

[0074] The stopper 62 is formed in a plate shape extending in the circumferential direction of the second rotation axis Ax2. In the circumferential direction of the second rotation axis Ax2, the stopper 62 is shorter than the lifter 61. In addition, the length of the stopper 62 is not limited to this example.

[0075] Figure 4 It is an exemplary cross-sectional view showing a part of the suspension 37 and a part of the slope 53 according to the present embodiment. Figure 4 The length L2 of the stopper 62 in the radial direction of the second rotation axis Ax2 shown is 1.89 mm or more and 2.23 mm or less. In the present embodiment, the length L2 is, for example, about 2.06 mm. In addition, the length L2 is not limited to this example.

[0076] The stopper 62 has an end surface 81, two receiving surfaces 82 and 83, and an intermediate portion 84. The end surface 81 is an example of an end edge of a protruding portion on the inner side of the second rotating shaft in the radial direction. The receiving surface 82 is an example of a second supporting surface. The receiving surface 83 is an example of a third supporting surface.

[0077] The end face 81 is provided at the end edge of the limiter 62 in the inner direction Di. The end face 81 is generally oriented in the inner direction Di. In addition, the end face 81 may also be oriented in other directions. The bearing surface 82 extends from the end edge of the end face 81 in the +Z direction to the outer direction Do. The bearing surface 83 extends from the end edge of the end face 81 in the -Z direction to the outer direction Do. Therefore, the bearing surface 83 is located on the opposite side of the bearing surface 82.

[0078] The bearing surface 82 is formed to be substantially flat and faces substantially the +Z direction. The bearing surface 82 is spaced apart from the holding surface 71 in the -Z direction in the Z direction. The bearing surface 82 faces the ABS (air bearing surface) 14a of the corresponding magnetic head 14 across a gap when the corresponding suspension 37 is in the unloading position. The ABS 14a is the surface of the magnetic head 14 facing the recording surface 12a of the magnetic disk 12 when the magnetic head 14 is in the loading position.

[0079] The receiving surface 83 is formed to be substantially flat and faces substantially in the -Z direction. Figure 2 As shown, the receiving surface 83 is spaced apart from the holding surface 72 in the +Z direction in the Z direction. When the corresponding suspension 37 is located at the unloading position, the receiving surface 83 faces the ABS 14a of the corresponding magnetic head 14 with a gap therebetween.

[0080] The receiving surface 82 and the receiving surface 83 extend substantially in parallel. In the radial direction of the second rotation axis Ax2, the length of the receiving surface 82 and the length of the receiving surface 83 are substantially equal. In addition, the receiving surfaces 82 and 83 are not limited to this example.

[0081] Figure 4 The distance between the receiving surface 82 and the receiving surface 83 shown, that is, the thickness L3 is greater than or equal to 0.1 mm and less than or equal to 0.55 mm. In the present embodiment, the thickness L3 is, for example, about 0.22 mm. In addition, the thickness L3 is not limited to this example.

[0082] When the suspension 37 is located at the unloading position, the inflow end 14b of the magnetic head 14 is located at the radial inner side of the second rotation axis Ax2 than the end surface 81. The inflow end 14b is the end edge of the magnetic head 14 in the inner direction Di. In addition, when the suspension 37 is located at the unloading position, the inflow end 14b is located at the radial inner side of the second rotation axis Ax2 than the end edge 82a of the bearing surface 82 in the inner direction Di and the end edge 83a of the bearing surface 83 in the inner direction Di.

[0083] When the hanger 37 is in the unloaded position, the distance L4 between the inflow end 14b and the end surface 81 in the radial direction of the second rotation axis Ax2 is greater than or equal to 0.15 mm and less than or equal to 0.19 mm. In the present embodiment, the distance L4 is, for example, about 0.17 mm. In addition, the distance L4 is not limited to this example.

[0084] The end surface 81 of the stopper 62 is spaced apart from the magnetic disk 12 in the radial direction of the second rotation axis Ax2. When the suspension 37 is in the unloaded position, the inlet end 14b of the magnetic head 14 is located between the end surface 81 and the magnetic disk 12 in the radial direction of the second rotation axis Ax2.

[0085] like Figure 2 As shown, the stopper 62 is disposed between the two magnetic heads 14 at the unloading position. When the suspension 37 vibrates in the Z direction, the receiving surfaces 82 and 83 may abut against the ABS 14a of the corresponding magnetic head 14. Thus, the stopper 62 can prevent the two magnetic heads 14 from abutting against each other.

[0086] The ABS 14 a and the receiving surfaces 82 , 83 are formed to be substantially flat and are arranged substantially in parallel. Therefore, the ABS 14 a and the receiving surfaces 82 , 83 can contact each other over a wider range when they abut against each other.

[0087] When the suspension 37 vibrates, the two magnetic heads 14 may tilt so that the inflow ends 14b approach each other. The stopper 62 is set to have a thickness L3 and a distance L4 so as to abut against the magnetic heads 14 to prevent the inflow ends 14b from abutting against each other.

[0088] like Figure 4 As shown, the corner portion between the end surface 81 and the end edge 82a of the receiving surface 82 is rounded to form a curved surface 85. In addition, the corner portion between the end surface 81 and the end edge 83a of the receiving surface 83 is rounded to form a curved surface 86.

[0089] The curved surfaces 85 and 86 form substantially arc-shaped edges in cross section. The stopper 62 formed with the curved surfaces 85 and 86 can prevent the magnetic head 14 from being damaged when it comes into contact with the tilted magnetic head 14.

[0090] When the suspension 37 is located at the unloading position, the outflow end 14c of the magnetic head 14 is located at the radial inner side of the second rotation axis Ax2 than the end edge 82b of the bearing surface 82 in the outer direction Do. The outflow end 14c is the end edge of the magnetic head 14 in the outer direction Do. In addition, when the suspension 37 is located at the unloading position, the outflow end 14c of the magnetic head 14 is located at the radial inner side of the second rotation axis Ax2 than the end edge 83b of the bearing surface 83 in the outer direction Do.

[0091] The intermediate portion 84 is provided between the lifter 61 and the receiving surface 82 in the radial direction of the second rotation axis Ax2. The intermediate portion 84 has two inclined surfaces 87 and 88. The inclined surface 87 is an example of a first inclined surface. The inclined surface 88 is an example of a second inclined surface.

[0092] The inclined surface 87 is connected to the end edge 82b of the receiving surface 82 and the side surface 73 of the lifter 61. The inclined surface 87 extends obliquely relative to the receiving surface 82. Specifically, the inclined surface 87 extends in a direction between the outer direction Do and the direction (+Z direction) in which the recording surface 12a of the corresponding magnetic disk 12 faces. Therefore, in the inclined surface 87, the more the part is closer to the outer side in the radial direction of the second rotation axis Ax2, the closer it is to the holding surface 71 in the Z direction.

[0093] For example, the inclined surface 87 has a first portion P1 and a second portion P2. The first portion P1 is a portion of the inclined surface 87. Therefore, the first portion P1 is located between the holding surface 71 and the receiving surface 82 in the Z direction.

[0094] The second portion P2 is another portion of the inclined surface 87. The second portion P2 is located outside the first portion P1 in the radial direction of the second rotation axis Ax2. Therefore, the second portion P2 is located between the first portion P1 and the holding surface 71 in the radial direction of the second rotation axis Ax2. Moreover, the second portion P2 is located between the first portion P1 and the holding surface 71 in the Z direction.

[0095] The inclined surface 88 is located on the opposite side of the inclined surface 87. The inclined surface 88 is connected to the end edge 83b of the receiving surface 83 and the side surface 73 of the lifter 61. The inclined surface 88 extends obliquely relative to the receiving surface 83. Specifically, the inclined surface 88 extends in a direction between the outer direction Do and the direction (-Z direction) in which the recording surface 12a of the corresponding magnetic disk 12 faces. Therefore, in the inclined surface 88, the more the part is closer to the outer side in the radial direction of the second rotation axis Ax2, the closer it is to the holding surface 72 in the Z direction.

[0096] The inclined surface 87 and the inclined surface 88 extend so as to become tapered toward the inner direction Di. In other words, the inclined surface 87 and the inclined surface 88 extend obliquely so as to approach each other toward the inner direction Di.

[0097] The angle θ between the receiving surface 82 and the inclined surface 87 is less than 170° and greater than the angle between the virtual plane VP and the receiving surface 82. The virtual plane VP is an imaginary plane extending between the end edge 71a of the holding surface 71 and the end edge 82b of the receiving surface 82. In the present embodiment, the angle θ is, for example, about 169°. In addition, the angle θ is not limited to this example.

[0098] The angle between the receiving surface 83 and the inclined surface 88 is substantially equal to the angle θ. Therefore, the stopper 62 is formed to be mirror-symmetrical in the Z direction. In addition, the angle between the receiving surface 83 and the inclined surface 88 may be different from the angle θ.

[0099] In the Z direction, the end edge 87a of the inclined surface 87 in the outer direction Do is closer to the holding surface 71 than the receiving surface 82. The end edge 87a is an example of the end edge of the middle portion of the radial outer side of the second rotation axis. In addition, in the Z direction, the end edge 88a of the inclined surface 88 in the outer direction Do is closer to the holding surface 72 than the receiving surface 83.

[0100] According to the above, in the limiter 62, the cross-sectional area at the portion where the lifter 61 and the middle portion 84 are connected is larger than the cross-sectional area at the front end (end surface 81) of the limiter 62. This cross-sectional area is the area of ​​the cross section perpendicular to the direction in which the limiter 62 extends. In other words, the end of the limiter 62 connected to the lifter 61 is thicker than the other end.

[0101] The middle portion 84 may have another surface that can have the first portion and the second portion instead of the inclined surfaces 87 and 88. For example, the middle portion 84 may have a stepped surface with two or more steps instead of the inclined surfaces 87 and 88. The first portion is located at a lower step in the stepped surface. The second portion is located at a higher step in the stepped surface.

[0102] In the Z direction, the distance L5 between the end edge 87a of the inclined surface 87 and the holding surface 71 is longer than the distance L6 between the end edge 87a of the inclined surface 87 and the receiving surface 82. In the present embodiment, the distance L5 is, for example, about 0.60 mm. The distance L6 is, for example, about 0.1875 mm. Since the shape of the limiter 62 is mirror-symmetrical, the maximum thickness of the middle portion 84 in the Z direction is about 0.545 mm. In addition, the distances L5 and L6 are not limited to this example.

[0103] When the suspension 37 is located at the unloaded position, the inclined surface 87 faces the end 43a of the flexure 43 in the outward direction Do with a gap therebetween. The end 43a can also be referred to as a TE limiter.

[0104] When the suspension 37 is located at the unloading position, in the Z direction, the distance L7 between the end 43a of the flexure 43 and the limiter 62 is longer than the distance L8 between the magnetic head 14 and the receiving surface 82. Therefore, when the suspension 37 vibrates in the Z direction and the magnetic head 14 abuts against the receiving surface 82, the end 43a of the flexure 43 is spaced apart from the limiter 62.

[0105] The distance L9 in the radial direction of the 2nd rotation axis Ax2 between the outflow end 14c of magnetic head 14 and the end edge 82b of receiving surface 82 is more than 0mm. In the present embodiment, distance L9 is, for example, 0.16mm. In addition, distance L9 is not limited to this example. Distance L9 is also the distance in the radial direction of the 2nd rotation axis Ax2 between outflow end 14c and intermediate portion 84.

[0106] In the radial direction of the second rotation axis Ax2, the distance between the second rotation axis Ax2 and the end face 81 is, for example, about 46.97 mm. In the radial direction of the second rotation axis Ax2, the distance between the second rotation axis Ax2 and the end edge 82b of the receiving surface 82 is, for example, about 48.33 mm. Therefore, the distance on the second rotation axis Ax2 between the end face 81 and the end edge 82b of the receiving surface 82 is about 1.36 mm. On the second rotation axis Ax2, the distance between the second rotation axis Ax2 and the side surface 73 is, for example, 49.03 mm. In addition, the above dimensions are examples.

[0107] The ramp loading mechanism 17 is manufactured by injection molding, for example. During injection molding, in the cavity of the mold, the material flows from the lifter 61 toward the end surface 81 of the front end of the limiter 62. That is, the material flows from the wide space forming the lifter 61 to the narrow space forming the limiter 62.

[0108] For example, when the restrictor 62 is thin and has a certain thickness, it is difficult for the material to flow into the depth of the space forming the restrictor 62. However, in the present embodiment, the middle portion 84 extends in a tapered manner from the side surface 73 of the lifter 61. Therefore, the middle portion 84 makes it easy for the material to flow from the space forming the lifter 61 to the space forming the middle portion 84.

[0109] Since part of the limiter 62 is the middle portion 84, the material is more likely to flow into the depth of the space forming the limiter 62 than when the thickness of the limiter 62 is constant. Therefore, the slope loading mechanism 17 of this embodiment can suppress the occurrence of manufacturing defects in injection molding. In addition, the slope loading mechanism 17 can also be manufactured by other manufacturing methods.

[0110] In the HDD 10 of the present embodiment described above, the suspension 37 has a load beam 42, a lifting tab 45, a flexure 43, and a universal joint 46. The load beam 42 extends in the radial direction of the second rotation axis Ax2. The lifting tab 45 is provided at the end of the load beam 42 in the outer direction Do. The flexure 43 is mounted on the load beam 42. The universal joint 46 is provided on the flexure 43 between the lifting tab 45 and the second rotation axis Ax2 in the radial direction of the second rotation axis Ax2, and holds the magnetic head 14. The suspension 37 rotates around the second rotation axis Ax2 between a loading position where the lifting tab 45 is spaced from the slope 53 and the magnetic head 14 is located on the recording surface 12a, and an unloading position where the lifting tab 45 is held on the slope 53. The slope 53 has a lifter 61 and a limiter 62 protruding from the lifter 61 in the inner direction Di. The lifter 61 has a holding surface 71 that supports the lifting tab 45 when the suspension 37 is located at the unloading position. The limiter 62 has a receiving surface 82 and an intermediate portion 84. The receiving surface 82 is spaced apart from the holding surface 71 in the Z direction and faces the magnetic head 14 when the suspension 37 is located at the unloading position. The intermediate portion 84 is arranged between the lifter 61 and the receiving surface 82 in the radial direction of the second rotation axis Ax2. When the suspension 37 is located at the unloading position, in the Z direction, the distance L7 between the end 43a of the flexure 43 in the outer direction Do and the limiter 62 is longer than the distance L8 between the magnetic head 14 and the receiving surface 82. When the suspension 37 vibrates in the Z direction, the limiter 62 abuts against the magnetic head 14 with the receiving surface 82, but it is difficult to abut against the end 43a of the flexure 43. The limiter 62 of this embodiment can omit the part that receives the end 43a of the flexure 43 when the suspension 37 vibrates. Therefore, the slope 53 of the present embodiment can make the limiter 62 thinner, and further, the limiter 62 can be provided even when the interval L1 between the plurality of magnetic disks 12 is narrow. On the other hand, when the limiter 62 is thin, for example, in injection molding, it may be difficult to supply material to the front end (end surface 81) of the limiter 62. However, in the present embodiment, the middle portion 84 has a first portion P1 located between the holding surface 71 and the receiving surface 82 in the Z direction and a second portion P2 located between the first portion P1 and the holding surface 71 in the Z direction and between the first portion P1 and the holding surface 71 in the radial direction of the second rotation axis Ax2. That is, the middle portion 84 gradually or stepwise thickens toward the lifter 61 having the holding surface 71. Therefore, the HDD 10 of the present embodiment can easily supply material to the front end of the limiter 62, for example, in injection molding, and further, even if the limiter 62 is set to be thin, it is possible to suppress the difficulty in manufacturing the slope 53.

[0111] The middle portion 84 has an inclined surface 87 connected to the receiving surface 82 and extending obliquely relative to the receiving surface 82. The inclined surface 87 has a first portion P1 and a second portion P2. That is, the middle portion 84 gradually becomes thicker toward the lifter 61 having the holding surface 71. Therefore, for example, in injection molding, the material can be easily supplied to the front end of the limiter 62, and the manufacturing of the slope 53 becomes easy.

[0112] The limiter 62 further includes a receiving surface 83 located on the opposite side of the receiving surface 82 and an inclined surface 88 connected to the receiving surface 83 and extending obliquely relative to the receiving surface 83. The inclined surface 87 and the inclined surface 88 become tapered toward the inner direction Di. That is, the inclined surface 87 and the inclined surface 88 become tapered toward the front end of the limiter 62. Therefore, for example, in injection molding, the material can be easily supplied to the front end of the limiter 62, and the manufacturing of the slope 53 becomes easy.

[0113] When the suspension 37 is located at the unloading position, the inflow end 14b of the magnetic head 14 is located at the inner side of the radial direction of the second rotation axis Ax2 than the end surface 81 of the limiter 62. Thus, it is possible to suppress the inflow end 14b of the magnetic head 14 from colliding with the limiter 62 when the suspension 37 vibrates in the Z direction. In addition, the length of the limiter 62 becomes relatively short, and the limiter 62 can be easily formed.

[0114] When the suspension 37 is at the unloading position, the outflow end 14c of the magnetic head 14 is located radially inward of the second rotation axis Ax2 relative to the edge 82b of the receiving surface 82 in the outer direction Do. Thus, the outflow end 14c of the magnetic head 14 can be prevented from colliding with the middle portion 84 when the suspension 37 vibrates in the Z direction.

[0115] In the Z direction, the distance L5 between the end edge 87a of the middle portion 84 in the outer direction Do and the holding surface 71 is longer than the distance L6 between the end edge 87a of the middle portion 84 in the outer direction Do and the receiving surface 82. As a result, the size of the middle portion 84 in the Z direction becomes relatively small, and interference between the middle portion 84 and the suspension 37 can be suppressed.

[0116] In the above description, inhibition is defined as, for example, preventing an event, action, or influence from occurring or reducing the extent of an event, action, or influence. In addition, in the above description, restriction is defined as, for example, preventing movement or rotation, or allowing movement or rotation within a predetermined range and preventing movement or rotation beyond the predetermined range.

[0117] Although some embodiments of the present invention are described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the scope of the subject matter of the invention. These embodiments and / or their variations are included in the scope and subject matter of the invention, and are included in the invention described in the claims and their equivalents.

Claims

1. A disk device comprising: A plurality of magnetic disks, each magnetic disk having a recording surface and being rotatable about a first rotation axis intersecting the recording surface; a magnetic head configured to read and write information on the recording surface; a ramp spaced apart from the first rotation axis; and The suspension comprises a load beam extending in the radial direction of a second rotating axis, a sliding portion provided at an end of the load beam on the radially outer side of the second rotating axis, a flexure mounted on the load beam, and a holding portion provided on the flexure between the sliding portion in the radial direction of the second rotating axis and the second rotating axis and holding the magnetic head, and is configured to rotate around the second rotating axis between a loading position where the sliding portion is spaced apart from the slope and the magnetic head is located on the recording surface and an unloading position where the sliding portion is held on the slope, The slope includes a wall and a protrusion protruding from the wall toward the inside in the radial direction of the second rotation axis. The wall has a first supporting surface for supporting the sliding portion when the suspension is located at the unloading position. The protrusion has a second supporting surface which is spaced apart from the first supporting surface in the axial direction of the first rotating shaft and faces the magnetic head when the suspension is in the unloading position, and an intermediate portion which is provided between the wall and the second supporting surface in the radial direction of the second rotating shaft. When the suspension is located at the unloading position, in the axial direction of the first rotating shaft, the distance between the end of the flexure on the radially outer side of the second rotating shaft and the protrusion is longer than the distance between the magnetic head and the second supporting surface. The intermediate portion includes a first portion located between the first supporting surface and the second supporting surface in the axial direction of the first rotating shaft, and a second portion located between the first portion and the first supporting surface in the axial direction of the first rotating shaft and between the first portion and the first supporting surface in the radial direction of the second rotating shaft.

2. The disk device according to claim 1, The intermediate portion has a first inclined surface connected to the second supporting surface and extending obliquely relative to the second supporting surface. The first inclined surface includes the first portion and the second portion.

3. The disk device according to claim 2, The protrusion further includes a third support surface located on the opposite side of the second support surface and a second inclined surface connected to the third support surface and extending obliquely relative to the third support surface. The first inclined surface and the second inclined surface extend so as to become tapered toward the inside in the radial direction of the second rotation axis.

4. The disk device according to claim 3, The distance between the plurality of disks is less than 1.482 mm, A distance between the second support surface and the third support surface is greater than or equal to 0.1 mm and less than or equal to 0.55 mm.

5. The disk device according to any one of claims 2 to 4, The angle between the second supporting surface and the first inclined surface is less than 170° and is greater than the angle between an imaginary surface and the second supporting surface, and the imaginary surface extends between the end edge of the first supporting surface on the radial inner side of the second rotating axis and the end edge of the second supporting surface on the radial outer side of the second rotating axis.

6. The disk device according to any one of claims 1 to 4, When the suspension is located at the unloading position, the end edge of the magnetic head on the radial inner side of the second rotating shaft is located radially inner than the end edge of the protrusion on the radial inner side of the second rotating shaft.

7. The disk device according to claim 6, When the suspension is located at the unloading position, a radial distance in the second rotation axis between an end edge of the magnetic head radially inward of the second rotation axis and an end edge of the protrusion radially inward of the second rotation axis is greater than or equal to 0.15 mm and less than or equal to 0.19 mm.

8. The disk device according to any one of claims 1 to 4, When the suspension is located at the unloading position, an end edge of the magnetic head on the radially outer side of the second rotating shaft is located radially inner than an end edge of the second supporting surface on the radially outer side of the second rotating shaft.

9. The disk device according to any one of claims 1 to 4, In the axial direction of the first rotating shaft, a distance between an end edge of the radially outer middle portion of the second rotating shaft and the first supporting surface is longer than a distance between an end edge of the radially outer middle portion of the second rotating shaft and the second supporting surface.

10. The disk device according to any one of claims 1 to 4, A length of the protruding portion in the radial direction of the second rotating shaft is greater than or equal to 1.89 mm and less than or equal to 2.23 mm.

11. The disk device according to any one of claims 1 to 4, When the suspension is located at the unloading position, in the radial direction of the second rotating shaft, the end edge of the magnetic head on the radial inner side of the second rotating shaft is located between the end edge of the protrusion on the radial inner side of the second rotating shaft and the plurality of magnetic disks.

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