Disk device

Abstract

A disk device capable of suppressing the narrowing of the data area of ​​a disk is provided. The disk device of one embodiment comprises a plurality of disks, a motor, a plurality of magnetic heads, a ramp, a frame, a plurality of suspensions and a plurality of inclined surfaces. The plurality of inclined surfaces are arranged on the ramp, extend obliquely relative to the recording surface, and support the sliding portion when the plurality of suspensions rotate from the loading position to the unloading position. The plurality of inclined surfaces include a first inclined surface to a third inclined surface. Among the plurality of inclined surfaces, the end of the second inclined surface in the inner direction is closer to the first rotation axis than the end of the first inclined surface in the inner direction and is farther from the first rotation axis than the end of the third inclined surface in the inner direction, or the angle between the second inclined surface and the recording surface is smaller than the angle between the first inclined surface and the recording surface and larger than the angle between the third inclined surface and the recording surface.

Description

[0001] This application claims the priority of Japanese Patent Application No. 2021-154722 (filing date: September 22, 2021) as a basic application. The present application incorporates the entire contents of the basic application by reference. Technical Field

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

[0003] In a disk device such as a hard disk drive (HDD), a suspension holding a magnetic head moves between a loading position and an unloading position. In the loading position, the magnetic head is located on the surface of the magnetic disk and reads and writes information to the magnetic disk. In the unloading position, the suspension is supported on a slope and the magnetic head is separated from the magnetic disk. Summary of the invention

[0004] The positions of the plurality of disks may be different from the designed positions due to, for example, dimensional tolerances. In addition, the positions of the magnetic head and the suspension at the loading position may be affected by the positions of the disks. Therefore, when the plurality of suspensions move to the unloading position, deviations may occur at the positions where they abut against the slope. The data area of ​​the disk is set, for example, based on the positions where the plurality of suspensions abut against the slope first (initially). Therefore, when the first abutment occurs in advance, the data area may become narrower.

[0005] One example of the problem to be solved by the present invention is to provide a disk device capable of suppressing the reduction of the data area of ​​the magnetic disk.

[0006] A disk device according to one embodiment includes a plurality of disks, a motor, a plurality of magnetic heads, a ramp, a frame, a plurality of suspensions, and a plurality of ramps. The plurality of disks each have a recording surface and are arranged in the axial direction of a first rotation axis intersecting the recording surface. The motor rotates the plurality of disks around the first rotation axis. The plurality of magnetic heads are configured to read and write information on the plurality of disks. The ramp is separated from the first rotation axis. The frame has a wall on which the motor is mounted, and accommodates the plurality of disks, the motor, the plurality of magnetic heads, and the ramp. The plurality of suspensions each have a sliding portion separated from a second rotation axis, and a holding portion located between the sliding portion and the second rotation axis and holding the magnetic heads, and are configured to rotate around the second rotation axis between a loading position and an unloading position, the loading position being a position where the magnetic head is located on the recording surface, and the unloading position being a position where the sliding portion is supported on the ramp so that the magnetic head is further away from the recording surface in the axial direction of the first rotation axis than the magnetic head at the loading position. The plurality of inclined surfaces are provided on the slope, and extend at an obtuse angle relative to the recording surface in such a manner that the farther from the first rotating axis in the circumferential direction around the second rotating axis, the farther from the recording surface in the axial direction of the first rotating axis, and support the sliding portion when the plurality of suspensions rotate from the loading position to the unloading position. The plurality of inclined surfaces include a first inclined surface, a second inclined surface, and a third inclined surface that support the sliding portion of a different one of the plurality of suspensions. The second inclined surface is farther from the wall in the axial direction of the first rotating axis than the first inclined surface, and is closer to the wall in the axial direction of the first rotating axis than the third inclined surface. Among the multiple inclined surfaces, the end of the second inclined surface in the inner direction around the second rotation axis toward the first rotation axis is closer to the first rotation axis than the end of the first inclined surface in the inner direction, and is farther from the first rotation axis than the end of the third inclined surface in the inner direction, or the angle between the second inclined surface and the recording surface is smaller than the angle between the first inclined surface and the recording surface, and larger than the angle between the third inclined surface and the recording surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is an exemplary perspective view showing a hard disk drive (HDD) according to the first embodiment.

[0008] Figure 2 This is an exemplary plan view showing a part of the HDD according to the first embodiment.

[0009] Figure 3 This is an exemplary side view schematically showing a part of the ramp loading mechanism according to the first embodiment.

[0010] Figure 4 This is an exemplary side view schematically showing three inclined surfaces of the ramp loading mechanism according to the first embodiment.

[0011] Figure 5 This is an exemplary side view schematically showing a part of the ramp loading mechanism according to the second embodiment.

[0012] Figure 6 This is an exemplary side view schematically showing three inclined surfaces of the ramp loading mechanism according to the second embodiment.

[0013] Description of symbols

[0014] 10 hard disk drive (HDD); 11 frame; 12 magnetic disk; 12a recording surface; 13 spindle motor; 14 magnetic head; 17 ramp loading mechanism; 21 bottom wall; 37 suspension; 45 lift tab; 46 gimbal portion; 56, 56A, 56B, 56C, 156, 156A, 156B, 156C inclined surfaces; 61, 62 end portions; Ax1 first rotation axis; Ax2 second rotation axis; Pl loading position; Pu unloading position; θ, θA, θB, θC angles; Di inner direction; Do outer direction. DETAILED DESCRIPTION

[0015] (First embodiment)

[0016] Below, refer to Figure 1 to Figure 4 The first embodiment is described. In addition, in this specification, sometimes the components involved in the embodiment and the description of the components are recorded in multiple expressions. The components and their descriptions are examples and are not limited by the descriptions in this specification. The components may also be identified by names different from the names in this specification. In addition, the components may also be described by expressions different from the descriptions in this specification.

[0017] Figure 1 1 is an illustrative perspective view showing a hard disk drive (HDD) 10 according to the first embodiment. The HDD 10 is an example of a disk device, and may also be called an electronic device, a storage device, an external storage device, or a magnetic disk device.

[0018] As shown in the drawings, in this specification, for the convenience of explanation, an X-axis, a Y-axis, and a Z-axis are defined. 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.

[0019] Furthermore, in this specification, an X direction, a Y direction, and a 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.

[0020] like Figure 1 As shown, HDD 10 has a housing 11, a plurality of magnetic disks 12, a spindle motor 13, a plurality of magnetic heads 14, an actuator assembly 15, a voice coil motor (VCM) 16, a ramp loading mechanism 17, and a flexible printed wiring board (FPC) 18. The spindle motor 13 is an example of a motor. The magnetic head 14 may also be referred to as a slider. The ramp loading mechanism 17 is an example of a ramp.

[0021] The frame 11 is formed in a rectangular box shape extending in the Y direction and open in the +Z direction. The frame 11 has a bottom wall 21 and a peripheral wall 22. The bottom wall 21 is an example of a wall. The frame 11 may further have other components such as a cover.

[0022] 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 a 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, for example, and are formed integrally.

[0023] An inner chamber 25 opened in the +Z direction is provided inside the frame 11. The inner chamber 25 is formed (defined, divided) by, for example, a bottom wall 21 and a peripheral wall 22. Therefore, the peripheral wall 22 surrounds the inner chamber 25. The magnetic disk 12, the spindle motor 13, the magnetic head 14, the actuator assembly 15, the VCM 16, and the ramp loading mechanism 17 are accommodated in the inner chamber 25 of the frame 11.

[0024] The inner chamber 25 is closed by the cover to be basically airtight, for example. 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 also be maintained at a vacuum, a low pressure close to a vacuum, or a negative pressure lower than the atmospheric pressure.

[0025] 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, 3.5 inches, but is not limited to this example. Each of the plurality of magnetic disks 12 has, for example, at least one recording surface 12a and an outer edge 12b.

[0026] 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 approximately in the +Z direction or surfaces of the magnetic disk 12 facing approximately in the -Z direction. The recording surface 12a is a substantially flat surface extending along the X-Y 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.

[0027] In the HDD 10 of the present embodiment, the number of magnetic disks 12 is, for example, 10 or more. The number of magnetic disks 12 in the HDD 10 is not limited to this example, and may be less than 10.

[0028] The spindle motor 13 is mounted on the bottom wall 21 of the housing 11 . Alternatively, the spindle motor 13 may be disposed at another location. The plurality of magnetic disks 12 are mounted on the spindle motor 13 .

[0029] The plurality of magnetic disks 12 are arranged at intervals in the Z direction. For example, spacers are arranged between the plurality of magnetic disks 12. 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, clamp springs.

[0030] 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.

[0031] The first rotation axis Ax1 is the center of rotation realized by 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-shaped disk 12 and the central axis of the hub of the spindle motor 13 may be different from the center of rotation realized by the spindle motor 13.

[0032] 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 magnetic disk 12. The magnetic head 14 is mounted on the actuator assembly 15.

[0033] The actuator assembly 15 is rotatably supported by a support shaft 31, and the support shaft 31 is disposed at a position away 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.

[0034] The actuator assembly 15 can rotate around a second rotation axis Ax2 separated 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 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.

[0035] 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 direction rotating clockwise and a direction rotating counterclockwise around the axis.

[0036] As described above, the first rotation axis Ax1 and the second rotation axis Ax2 extend approximately in parallel along the Z direction and are separated 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 Z direction can also be called the seek direction. The first rotation axis Ax1 is separated from the second rotation axis Ax2 in the radial direction of the second rotation axis Ax2.

[0037] The VCM 16 rotates the actuator assembly 15 around the second rotation axis Ax2 and arranges it at a desired position. When 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 away from the magnetic disk 12.

[0038] The actuator assembly 15 has an actuator block 35, a plurality of arms 36, and a plurality of head suspension assemblies (suspensions) 37. The suspensions 37 may also be referred to as head gimbal assemblies (HGAs).

[0039] The actuator block 35 is rotatably supported by the support shaft 31 via a bearing, for example. The 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.

[0040] 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 the gap between the adjacent magnetic disks 12. The arms 36 extend substantially in parallel.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] The suspensions 37 are attached to the front end portions of the corresponding arms 36 and protrude from the arms 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 base plate 41, a load beam 42, and a flexible portion 43.

[0045] The base plate 41 and the load beam 42 are made of, for example, stainless steel. In addition, the materials of the base plate 41 and the load beam 42 are not limited to this example. The base plate 41 is formed in a plate shape and is 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 from the base plate 41 in the radial direction of the second rotation axis Ax2.

[0046] The load beam 42 is formed in a plate shape that is thinner than the base plate 41 and extends along the XY plane. That is, the load beam 42 is supported on the base plate 41 in a cantilever manner and can be bent with one end attached to the base plate 41 as a fulcrum.

[0047] Figure 2 FIG. 1 is an illustrative top view showing a portion of the HDD 10 according to the first embodiment. Figure 2 As shown, 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 located at the front end of the actuator assembly 15 in the radial direction of the second rotation axis Ax2. In other words, the lift tab 45 is separated from the second rotation axis Ax2 in the radial direction of the second rotation axis Ax2.

[0048] The lifting tongue 45 is bent into a substantially boat shape extending in the radial direction of the second rotation axis Ax2. Therefore, the lifting tongue 45 has a substantially arc-shaped cross section protruding toward the corresponding recording surface 12a of the magnetic disk 12. The shape of the lifting tongue 45 is not limited to this example.

[0049] The flexible portion 43 is formed in a long and narrow strip shape. The shape of the flexible portion 43 is not limited to this example. The flexible portion 43 is a laminated plate having a metal plate (liner) such as stainless steel, an insulating layer formed on the metal plate, a conductive layer forming a plurality of wirings (wiring patterns) formed on the insulating layer, and a protective layer (insulating layer) covering the conductive layer.

[0050] The flexible portion 43 is attached to the base plate 41 and the load beam 42. The flexible portion 43 has a gimbal portion (elastic support portion) 46 at one end thereof, which is located on the load beam 42 and is displaceable. The gimbal portion 46 is an example of a holding portion.

[0051] The gimbal portion 46 is located between the load beam 42 and the 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 flexible portion 43 is electrically connected to the magnetic head 14.

[0052] The gimbal portion 46 is supported in a swingable manner by, for example, a substantially hemispherical protrusion 47 provided on the load beam 42. Therefore, the magnetic head 14 can swing together with the gimbal portion 46.

[0053] The gimbal portion 46 is located between the lifting tongue 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 tongue 45 and the second rotation axis Ax2 in the radial direction of the second rotation axis Ax2.

[0054] When the load beam 42 is bent so that the lifting tongue 45 is displaced in the Z direction, the gimbal portion 46 and the magnetic head 14 are also displaced in the Z direction. In addition, the displacement of the gimbal portion 46 and the magnetic head 14 may not completely follow the displacement of the lifting tongue 45. For example, the displacement of the gimbal portion 46 and the magnetic head 14 may be generated delayed from the displacement of the lifting tongue 45. In addition, for example, when the lifting tongue 45 is displaced within a predetermined range, the displacement of the gimbal portion 46 and the magnetic head 14 may not be generated.

[0055] Figure 1 One end of the FPC 18 is connected to the flexible portion 43. The other end of the FPC 18 is connected to a substrate arranged outside the frame 11, for example, via a connector provided on the frame 11. The substrate is equipped with, for example, a controller for controlling the entirety of the HDD 10 and an interface connector connected to a host computer. The substrate is electrically connected to the magnetic head 14 via the FPC 18 and the flexible portion 43.

[0056] The ramp load mechanism 17 is disposed at a position away from the first rotation axis Ax1 in the radial direction of the first rotation axis Ax1. Furthermore, the ramp load mechanism 17 is away from the second rotation axis Ax2 in the radial direction of the second rotation axis Ax2.

[0057] Figure 3 1 is an exemplary side view schematically showing a part of the ramp loading mechanism 17 of the first embodiment. Figure 3 to Figure 6 The ramp loading mechanism 17 is schematically shown such that the left-right direction in the figure corresponds to the circumferential direction around the second rotation axis Ax2.

[0058] like Figure 3 As shown, the ramp loading mechanism 17 has a plurality of ramp portions 50. The plurality of ramp portions 50 are respectively provided corresponding to the magnetic head 14 for reading and writing information on the recording surface 12a of the magnetic disk 12 and the actuator assembly 15 for moving the magnetic head 14. Therefore, the plurality of ramp portions 50 are arranged at intervals in the Z direction. The corresponding magnetic disks 12 are arranged in the gaps between the plurality of ramp portions 50.

[0059] In the following description, for the sake of convenience, the recording surface 12a facing the +Z direction and the magnetic head 14, the actuator assembly 15 and the ramp 50 corresponding to the recording surface 12a are mainly described. In addition, the description of the recording surface 12a facing the -Z direction and the magnetic head 14, the actuator assembly 15 and the ramp 50 corresponding to the recording surface 12a can be obtained by exchanging the +Z direction and the -Z direction in the following description.

[0060] like Figure 2 As shown, the slope portion 50 is located near the outer edge 12b of the magnetic disk 12. The slope portion 50 covers a portion of the recording surface 12a. The slope portion 50 includes a holding portion 51 and a guide portion 52.

[0061] The holding portion 51 can hold the lifting tab 45 at a position away from the outer edge 12b in the radial direction of the first rotation axis Ax1. Alternatively, the holding portion 51 may hold the lifting tab 45 inside the outer edge 12b in the radial direction of the first rotation axis Ax1.

[0062] For example, a recess 51a recessed in the -Z direction is provided in the holding portion 51. The lifting tongue 45 is fitted into the recess 51a, and the slope portion 50 holds the lifting tongue 45, thereby restricting the rotation of the actuator assembly 15. Alternatively, the holding portion 51 may hold the lifting tongue 45 by other means.

[0063] When the magnetic head 14 does not read or write information to the magnetic disk 12 (unloading), the lifting tongue 45 is held by the holding portion 51 of the slope portion 50 as described above. In other words, when unloading, the lifting tongue 45 is arranged at a position away from the outer edge 12b of the magnetic disk 12 along the radial direction of the first rotation axis Ax1. In addition, the lifting tongue 45 during unloading can 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 tongue 45 during unloading can also overlap with the recording surface 12a in the axial direction (Z direction) of the first rotation axis Ax1.

[0064] On the other hand, when the magnetic head 14 reads and writes information to the magnetic disk 12 (during loading), the lifting tongue 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 tongue 45 with a gap therebetween. In addition, during loading, at least a portion of the lifting tongue 45 may be arranged at a position away from the recording surface 12a along the radial direction of the first rotation axis Ax1.

[0065] The lifting tongue 45 moves between the area on the recording surface 12a and the position (home position) held by the holding portion 51 according to the rotation of the actuator assembly 15. When the lifting tongue 45 is held by the holding portion 51, the magnetic head 14 is separated 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 tongue 45 is held by the holding portion 51, the magnetic head 14 may also overlap with the recording surface 12a in the Z direction.

[0066] The lifting tongue 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 tongue 45 is substantially along the radial direction of the first rotation axis Ax1. Therefore, the lifting tongue 45 can move substantially in the radial direction of the first rotation axis Ax1 according to the rotation of the actuator assembly 15.

[0067] Specifically, the lifting tongue 45 can move along the circumferential direction around the second rotation axis Ax2 (radial direction of the first rotation axis Ax1) between the vicinity of the first rotation axis Ax1 and the holding portion 51. That is, in the circumferential direction around the second rotation axis Ax2, the lifting tongue 45 can move in a direction approaching the first rotation axis Ax1 and away from the holding portion 51, and in a direction away from the first rotation axis Ax1 and approaching the holding portion 51.

[0068] like Figure 3 As shown, the actuator assembly 15 and the suspension 37 included in the actuator assembly 15 rotate around the second rotation axis Ax2 between the loading position Pl and the unloading position Pu. The loading position Pl and the unloading position Pu are angles (positions) around the second rotation axis Ax2 at which the actuator assembly 15 extends.

[0069] During loading, the actuator assembly 15 is located at the loading position P1. That is, when the actuator assembly 15 is located at the loading position P1, the magnetic head 14 is located on the recording surface 12a of the magnetic disk 12.

[0070] In the following description, the position of the magnetic head 14 around the second rotation axis Ax2 when the actuator assembly 15 is located at the loading position P1 may also be referred to as the loading position P1. In addition, the loading position P1 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, during unloading, the actuator assembly 15 is located at the unloading position Pu. That is, when the actuator assembly 15 is located at the unloading position Pu, the lifting tongue 45 is supported by the holding portion 51 of the ramp loading mechanism 17 so that the magnetic head 14 is separated from the recording surface 12a. In addition, in the following description, the position of the magnetic head 14 around the second rotation axis Ax2 when the actuator assembly 15 is located at the unloading position Pu can also be referred to as the unloading position Pu.

[0072] The magnetic head 14 at the unloading position Pu is away from the recording surface 12a in the Z direction. A gap is also generated between the magnetic head 14 at the loading position P1 and the recording surface 12a. However, in the Z direction, the magnetic head 14 at the unloading position Pu is farther from the recording surface 12a than the magnetic head 14 at the loading position P1.

[0073] The guide portion 52 is located between the loading position P1 and the unloading position Pu in the circumferential direction around the second rotation axis Ax2. In other words, the guide portion 52 is located between the first rotation axis Ax1 and the holding portion 51 in the radial direction of the first rotation axis Ax1.

[0074] The guide portion 52 is connected to the holding portion 51. The guide portion 52 has a flat surface 55 and an inclined surface 56. That is, the ramp loading mechanism 17 is provided with a plurality of flat surfaces 55 and a plurality of inclined surfaces 56.

[0075] The plane 55 is a plane substantially parallel to the recording surface 12a of the magnetic disk 12. That is, the plane 55 extends along the XY plane and faces the +Z direction. The recessed portion 51a of the holding portion 51 is recessed from the plane 55 in the -Z direction.

[0076] In the direction along the recording surface 12a, the plane 55 is arranged at a position away from the recording surface 12a along the circumferential direction around the second rotation axis Ax2 (radial direction of the first rotation axis Ax1). In addition, the position of the plane 55 is not limited to this example. In addition, in the Z direction, the plane 55 is away from the recording surface 12a along the +Z direction.

[0077] The inclined surface 56 is located between the first rotation axis Ax1 and the plane 55 in the circumferential direction around the second rotation axis Ax2 (in the radial direction of the first rotation axis Ax1 ). The inclined surface 56 is connected to the plane 55 .

[0078] The inclined surface 56 extends at an obtuse angle relative to the corresponding recording surface 12a in such a manner that the farther the inclined surface 56 is from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2, the farther the inclined surface 56 is from the corresponding recording surface 12a in the Z direction. That is, the angle θ between the inclined surface 56 and the corresponding recording surface 12a is larger than 90° and smaller than 180°.

[0079] The inclined surface 56 is, for example, a plane extending in a substantially straight line. The inclined surface 56 is not limited to this example, and may be, for example, a curved surface. In addition, the angle θ between the inclined surface 56 and the corresponding recording surface 12a may be varied.

[0080] In this embodiment, the angles θ between the plurality of inclined surfaces 56 and the recording surface 12a are equal to each other. In addition, even if an error occurs in the angles θ between the plurality of inclined surfaces 56 and the recording surface 12a due to deformation, dimensional tolerance or other reasons, the plurality of angles θ are treated as equal angles. The angles θ between the plurality of inclined surfaces 56 and the recording surface 12a may also be different from each other.

[0081] As shown in the drawings, the circumferential direction around the second rotation axis Ax2 includes an inner direction Di and an outer direction Do. The inner direction Di is a direction around the second rotation axis Ax2 toward the first rotation axis Ax1. The outer direction Do is the opposite direction of the inner direction Di.

[0082] like Figure 2 As shown, in the direction along the recording surface 12a, the inclined surface 56 extends in the circumferential direction around the second rotation axis Ax2. The end 61 of the inclined surface 56 in the inner direction Di faces the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2. The end 62 of the inclined surface 56 in the outer direction Do is connected to the plane 55.

[0083] When the actuator assembly 15 moves from the loading position P1 to the unloading position Pu, the lifting tongue 45 abuts against the inclined surface 56. When the actuator assembly 15 further moves toward the unloading position Pu, the lifting tongue 45 moves while being supported by the inclined surface 56, thereby gradually moving away from the recording surface 12a in the Z direction. That is, the inclined surface 56 supports the lifting tongue 45 of the corresponding suspension 37 when the corresponding suspension 37 moves from the loading position P1 to the unloading position Pu.

[0084] In the following description, the magnetic head 14 and the lifting tongue 45 during the movement of the actuator assembly 15 from the loading position P1 to the unloading position Pu will be described in detail. Figure 2 As shown, when the actuator assembly 15 is located at the loading position P1, the magnetic head 14 is located on the recording surface 12a.

[0085] The recording surface 12a has a data area 12c and an invalid area 12d. The data area 12c is an area in the recording surface 12a where information can be read and written by the magnetic head 14. When the actuator assembly 15 is located at the loading position P1, the magnetic head 14 is located on the data area 12c. The invalid area 12d is arranged between the data area 12c and the outer edge 12b in the recording surface 12a. The invalid area 12d is, for example, an area where information is not read and written by the magnetic head 14.

[0086] like Figure 3As shown, when the actuator assembly 15 is located at the loading position P1, the magnetic head 14 is suspended on the recording surface 12a by the airflow generated between the rotating magnetic disk 12 and the magnetic head 14. That is, the magnetic head 14 at the loading position P1 is slightly away from the recording surface 12a in the Z direction.

[0087] The above-mentioned airflow generates a force (positive pressure) that causes the magnetic head 14 to leave from the recording surface 12a and a force (negative pressure) that causes the magnetic head 14 to approach the recording surface 12a. The airflow keeps the magnetic head 14 at a position (attachment position) that leaves from the recording surface 12a and the positive pressure is balanced with the negative pressure. That is, the airflow suppresses the magnetic head 14 from approaching the recording surface 12a and the magnetic head 14 from leaving from the recording surface 12a.

[0088] By the magnetic head 14 being held at the attachment position, the magnetic head 14 pulls the suspension 37. Therefore, the distance between the suspension 37 including the lifting tongue 45 and the recording surface 12a is also maintained substantially constant. In addition, the magnetic head 14 and the suspension 37 at the loading position P1 are not limited to this example.

[0089] At the loading position P1, the lifting tab 45 is substantially away from the ramp 50. In the Z direction, the lifting tab 45 is away from the magnetic head 14 by a predetermined interval. In addition, the distance between the lifting tab 45 and the magnetic head 14 may vary, for example, due to the vibration of the load beam 42. When the actuator assembly 15 rotates from the loading position P1 to the unloading position Pu, the lifting tab 45 abuts against the inclined surface 56.

[0090] When the actuator assembly 15 further rotates toward the unloading position Pu, the lifting tongue 45 moves while being supported by the inclined surface 56. During the rotation of the actuator assembly 15, the lifting tongue 45 gradually moves away from the recording surface 12a of the magnetic disk 12. In accordance with the displacement of the lifting tongue 45, the load beam 42 and the gimbal portion 46 pull the magnetic head 14 in the +Z direction. However, the magnetic head 14 is held in the attached position in the Z direction by the airflow between the magnetic head 14 and the recording surface 12a.

[0091] When the actuator assembly 15 rotates further, the lifting tongue 45 moves further away from the recording surface 12a. As a result, the force of the load beam 42 and the gimbal portion 46 pulling the magnetic head 14 exceeds the force of the airflow between the magnetic head 14 and the recording surface 12a to keep the magnetic head 14 in the attached position. At this time, the magnetic head 14 can move away from the recording surface 12a of the magnetic disk 12 in the Z direction.

[0092] The lifting tongue 45 gradually moves away from the recording surface 12a while being supported by the inclined surface 56 and moving toward the unloading position Pu. Corresponding to the displacement of the lifting tongue 45, the load beam 42 and the gimbal portion 46 cause the magnetic head 14 to move away (peel off) from the recording surface 12a. In other words, in the Z direction, the magnetic head 14 moves farther away from the recording surface 12a than the magnetic head 14 at the loading position P1. As the actuator assembly 15 approaches the unloading position Pu, the distance between the magnetic head 14 and the recording surface 12a becomes longer.

[0093] When the actuator assembly 15 further rotates, the lifting tongue 45 passes over the inclined surface 56 and is supported by the flat surface 55. When the actuator assembly 15 reaches the unloading position Pu, the lifting tongue 45 is fitted into the recessed portion 51a of the holding portion 51 and is held by the holding portion 51. That is, when the hanger 37 is located at the unloading position Pu, the flat surface 55 provided with the recessed portion 51a holds the lifting tongue 45.

[0094] The length of the inclined surface 56 in the Z direction and the length of the inclined surface 56 in the circumferential direction of the second rotation axis Ax2 are set, for example, in consideration of the distance (margin) between the loading position Pl and the unloading position Pu in the Z direction and the amplitude of the magnetic disk 12 caused by the impact. In addition, the length of the inclined surface 56 is not limited to this example.

[0095] In the present embodiment, the further away the plurality of inclined surfaces 56 are from the bottom wall 21 in the Z direction, the closer the end 61 of the inclined surface 56 is to the first rotation axis Ax1. Therefore, in the circumferential direction around the second rotation axis Ax2, the end 61 of each of the plurality of inclined surfaces 56 is arranged at the same position as the end 61 of one of the plurality of inclined surfaces 56 that is adjacent to the inclined surface 56 and closer to the bottom wall 21 than the inclined surface 56, or at a position closer to the first rotation axis Ax1 than the end 61 of the inclined surface 56.

[0096] The end portions 61 of two adjacent inclined surfaces 56 among the plurality of inclined surfaces 56 may also be provided at the same position in the circumferential direction around the second rotation axis Ax2. However, in the present embodiment, the end portion 61 of one inclined surface 56 farthest from the bottom wall 21 among the plurality of inclined surfaces 56 is closer to the first rotation axis Ax1 than the end portion 61 of one inclined surface 56 closest to the bottom wall 21 among the plurality of inclined surfaces 56 in the circumferential direction around the second rotation axis Ax2.

[0097] Figure 4 1 is a schematic side view showing the slopes 56A, 56B, and 56C of the slope loading mechanism 17 according to the first embodiment. Figure 4 The multiple inclined surfaces 56 will be described in detail by taking EMBODIMENT 2 as an example.

[0098] like Figure 4As shown, the plurality of inclined surfaces 56 include inclined surfaces 56A, 56B, and 56C. The inclined surface 56A is an example of a first inclined surface. The inclined surface 56B is an example of a second inclined surface. The inclined surface 56C is an example of a third inclined surface.

[0099] The inclined surfaces 56A, 56B, and 56C are different ones among the plurality of inclined surfaces 56. The inclined surfaces 56A, 56B, and 56C support the lifting tab 45 of a different one of the plurality of hangers 37. That is, the hanger 37 supported by the inclined surface 56A is different from the hanger 37 supported by the inclined surface 56B, and is different from the hanger 37 supported by the inclined surface 56C.

[0100] The inclined surface 56B is located between the inclined surface 56A and the inclined surface 56C in the Z direction. The inclined surface 56B is farther from the bottom wall 21 than the inclined surface 56A in the Z direction. Furthermore, the inclined surface 56B is closer to the bottom wall 21 in the Z direction than the inclined surface 56C.

[0101] The inclined surface 56B is adjacent to the inclined surfaces 56A and 56C in the Z direction. In addition, the inclined surfaces 56A, 56B, and 56C are not limited to this example. For example, at least one of the plurality of inclined surfaces 56 may be located between the inclined surface 56A and the inclined surface 56B. In addition, at least one of the plurality of inclined surfaces 56 may be located between the inclined surface 56B and the inclined surface 56C.

[0102] In the present embodiment, the end 61 of the slope 56B is closer to the first rotation axis Ax1 than the end 61 of the slope 56A. In other words, the end 61 of the slope 56B is separated from the end 61 of the slope 56A in the inner direction Di in the circumferential direction around the second rotation axis Ax2.

[0103] The end 61 of the slope 56B is farther from the first rotation axis Ax1 than the end 61 of the slope 56C. In other words, the end 61 of the slope 56B is away from the end 61 of the slope 56C in the outward direction Do in the circumferential direction around the second rotation axis Ax2.

[0104] In the circumferential direction around the second rotation axis Ax2, the distance L between the end portions 61 of two adjacent inclined surfaces 56 is substantially constant. Alternatively, the end portions 61 of the plurality of inclined surfaces 56 may be arranged so that the distance L varies.

[0105] The lengths of the plurality of inclined surfaces 56 are substantially constant in the circumferential direction around the second rotation axis Ax2. Therefore, the end 62 of the inclined surface 56B is closer to the first rotation axis Ax1 than the end 62 of the inclined surface 56A. In addition, the end 62 of the inclined surface 56B is farther from the first rotation axis Ax1 than the end 62 of the inclined surface 56C. In addition, the lengths of the plurality of inclined surfaces 56 may be different from each other.

[0106] The plurality of planes 55 include planes 55A, 55B, and 55C. The plane 55A is connected to the inclined plane 56A. The plane 55B is connected to the inclined plane 56B. The plane 55C is connected to the inclined plane 56C. Therefore, the planes 55A, 55B, and 55C support the lifting tongue 45 of a different one of the plurality of suspensions 37. The plane 55B is farther from the bottom wall 21 in the axial direction of the first rotation axis Ax1 than the plane 55A, and is closer to the bottom wall 21 in the axial direction of the first rotation axis Ax1 than the plane 55C.

[0107] The end 71 of the plane 55 in the inner direction Di is connected to the end 62 of the inclined surface 56 in the outer direction Do. Therefore, the end 71 of the plane 55B is closer to the first rotation axis Ax1 than the end 71 of the plane 55A. In addition, the end 71 of the plane 55B is farther from the first rotation axis Ax1 than the end 71 of the plane 55C.

[0108] like Figure 3 As shown in FIG. 1 , the lifting tongues 54 of the plurality of suspensions 37 overlap in the Z direction. In other words, the lifting tongues 54 of the plurality of suspensions 37 are arranged at substantially the same position in the circumferential direction around the second rotation axis Ax2. Therefore, in terms of design, when the plurality of suspensions 37 rotate from the loading position P1 to the unloading position Pu, the inclined surface 56B abuts against the lifting tongue 45 before the inclined surface 56A abuts against the lifting tongue 45 and after the inclined surface 56C abuts against the lifting tongue 45.

[0109] The suspension 37 is pulled by the magnetic head 14 held at the attached position by the airflow. That is, when the suspension 37 is located at the loading position P1, the position of the lifting tongue 45 in the Z direction is affected by the position of the recording surface 12a of the magnetic disk 12.

[0110] The thickness in the Z direction of the plurality of magnetic disks 12 and the spacers disposed between the plurality of magnetic disks 12 may vary due to, for example, dimensional tolerance. Due to the thickness variation, the position in the Z direction of the lifting tongue 45 at the loading position P1 may also vary. Therefore, in the circumferential direction around the second rotation axis Ax2, the position where the lifting tongue 45 of the plurality of suspensions 37 abuts against the inclined surface 56 may also vary.

[0111] The plurality of magnetic disks 12 are stacked on the bottom wall 21 on which the spindle motor 13 is mounted. Therefore, the magnetic disks 12 farther from the bottom wall 21 are more likely to have accumulated dimensional errors and to be more likely to deviate from the designed position.

[0112] For example, due to the above reasons, the farther the lifting tongues 45 of the plurality of hangers 37 at the loading position P1 are from the bottom wall 21 in the Z direction, the greater the deviation of the position in the Z direction. Therefore, the farther the lifting tongues 45 of the plurality of hangers 37 are from the bottom wall 21 in the Z direction, the greater the deviation of the position in contact with the inclined surface 56 in the circumferential direction around the second rotation axis Ax2.

[0113] like Figure 4 As shown, the range RB of the position where the lifting tab 45 can contact the inclined surface 56B is longer than the range RA of the position where the lifting tab 45 can contact the inclined surface 56A. In addition, the range RB is shorter than the range RC of the position where the lifting tab 45 can contact the inclined surface 56C.

[0114] For example, in the circumferential direction around the second rotation axis Ax2, when the ends 61 of the inclined surfaces 56A, 56B, and 56C are located at the same position, the centers of the ranges RA, RB, and RC are arranged at the same position. However, in the HDD 10 of the present embodiment, the center of the range RA is farther from the first rotation axis Ax1 than the center of the range RB. In addition, the center of the range RB is farther from the first rotation axis Ax1 than the center of the range RC. The centers of the ranges RA, RB, and RC are designed (nominal) to be the positions where the lifting tongue 45 contacts the inclined surface 56.

[0115] The ends of the ranges RA, RB, and RC in the outward direction Do are located at substantially the same position in the circumferential direction around the second rotation axis Ax2. The ends of the ranges RA, RB, and RC in the outward direction Do are the positions farthest from the first rotation axis Ax1 among the positions where the lifting tabs 45 can contact the inclined surfaces 56.

[0116] In the circumferential direction around the second rotation axis Ax2, the end of the range RB in the inner direction Di is separated from the end of the range RA in the inner direction Di in the inner direction Di. In addition, in the circumferential direction around the second rotation axis Ax2, the end of the range RB in the inner direction Di is separated from the end of the range RC in the inner direction Di in the outer direction Do.

[0117] The range RA overlaps with the ranges RB and RC. On the other hand, the range RB overlaps with the range RC near the end of the range RB in the inner direction Di, but does not overlap with the range RA. In addition, the range RC does not overlap with the ranges RA and RB near the end of the range RC in the inner direction Di.

[0118] In the HDD 10, the data area 12c is set, for example, as follows. First, the lifting tongue 45 that first contacts the inclined surface 56 among the lifting tongues 45 of the suspension 37 is determined. The boundary between the data area 12c and the invalid area 12d is set at a position that is a predetermined distance (angle) away from the position where the lifting tongue 45 contacts the inclined surface 56 in the inner direction Di. The predetermined distance is called an OD margin.

[0119] The area inside the boundary is set as a data area 12c. The data area 12c includes a servo area. In addition, the area outside the boundary is set as an invalid area 12d. The invalid area 12d includes an OD margin and a so-called area loss.

[0120] As described above, the size of the data area 12c is set based on the position (first contact position) where the lifting tongues 45 of the plurality of suspensions 37 first come into contact with the inclined surface 56. Therefore, the closer the first contact position is to the first rotation axis Ax1, the narrower the data area 12c becomes.

[0121] On the other hand, in the present embodiment, the positions of the ends 61 of the inclined surfaces 56A, 56B, and 56C and the ranges RA, RB, and RC are set as described above. The more the ranges RA, RB, and RC overlap, the easier it is for the lifting tongue 45 to first contact the inclined surface 56. That is, in the portion of the range RA that does not overlap with the ranges RB and RC, it is relatively difficult for the lifting tongue 45 to first contact the inclined surface 56. Therefore, in the present embodiment, the first contact position is likely to be farther from the first rotation axis Ax1, and the data area 12c is likely to become wider.

[0122] The setting of the data area 12 c is not limited to the above example. For example, the data area 12 c may be set based on the position where the first separation of the magnetic head 14 occurs in the plurality of suspensions 37 .

[0123] The position where the suspension 37 peels off the magnetic head 14 is deviated in the same manner as the position where the lifting tongue 45 abuts against the inclined surface 56. The range of the position where the suspension 37 peels off the magnetic head 14 is substantially consistent with the range obtained by moving the range of the position where the lifting tongue 45 abuts against the inclined surface 56 by a predetermined distance in the outer direction Do. Therefore, in the present embodiment, the position where the suspension 37 peels off the magnetic head 14 is likely to become farther from the first rotation axis Ax1, and the data area 12c is likely to become wider.

[0124] In the HDD 10 involved in the first embodiment described above, a plurality of inclined surfaces 56 are provided in the ramp loading mechanism 17. The inclined surface 56 extends at an obtuse angle relative to the recording surface 12a in such a manner that the farther the inclined surface 56 is from the first rotating axis Ax1 in the circumferential direction around the second rotating axis Ax2, the farther the inclined surface 56 is from the recording surface 12a in the Z direction. The inclined surface 56 supports the lifting tongue 45 when the suspension 37 rotates from the loading position Pl to the unloading position Pu. The plurality of magnetic disks 12 are arranged in the Z direction and rotated around the first rotating axis Ax1 by the spindle motor 13. That is, the spindle motor 13 is connected to the plurality of magnetic disks 12. As for the positions of the plurality of magnetic disks 12, the farther the positions are from the bottom wall 21 of the frame 11 on which the spindle motor 13 is mounted in the Z direction, the easier it is to be different from the designed positions. In addition, the suspension 37 is pulled by the magnetic head 14 attached to the recording surface 12a of the magnetic disk 12 by the balance of pressure. That is, in the Z direction, the position of the lifting tongue 45 of the suspension 37 is affected by the position of the magnetic disk 12. As described above, the farther the lifting tongues 45 of the plurality of suspensions 37 are from the bottom wall 21 in the Z direction, the greater the deviation of the position in the Z direction, and further, the greater the deviation of the position in contact with the inclined surface 56 in the circumferential direction around the second rotation axis Ax2. On the other hand, in the HDD 10 of the present embodiment, the plurality of inclined surfaces 56 include inclined surfaces 56A, 56B, and 56C that support the lifting tongue 45 of a different one of the plurality of suspensions 37. The inclined surface 56B is farther from the bottom wall 21 in the Z direction than the inclined surface 56A, and is closer to the bottom wall 21 in the Z direction than the inclined surface 56C. Among the plurality of inclined surfaces 56, the end 61 of the inclined surface 56B in the inner direction Di is closer to the first rotation axis Ax1 than the end 61 of the inclined surface 56A in the inner direction Di, and is farther from the first rotation axis Ax1 than the end 61 of the inclined surface 56C in the inner direction Di. In this case, the lifting tongue 45 of one of the plurality of hangers 37 corresponding to the inclined surface 56B and one of the hangers 37 corresponding to the inclined surface 56A is likely to abut against the inclined surface 56 after the lifting tongue 45 of one of the hangers 37 corresponding to the inclined surface 56C. The deviation of the position where the lifting tongue 45 abuts against the inclined surface 56C is greater than the deviation of the position where the lifting tongue 45 abuts against the inclined surface 56A and the position where the lifting tongue 45 abuts against the inclined surface 56B. In the above-mentioned inclined surfaces 56A, 56B, and 56C, the deviation ranges RA and RB of the positions where the lifting tabs 45 abut against the inclined surfaces 56A and 56B are away from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2. In the circumferential direction around the second rotation axis Ax2, the more the deviation ranges RA, RB, and RC overlap, the more likely it is that the lifting tabs 45 of the plurality of suspensions 37 first abut against the plurality of inclined surfaces 56. Therefore, the positions (first contact positions) where the lifting tabs 45 of the plurality of suspensions 37 first abut against the inclined surfaces 56 are likely to be away from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2.In general, the data area 12c of the magnetic disk 12 is set based on the first contact position. As described above, the HDD 10 of this embodiment can suppress the data area 12c of the magnetic disk 12 from becoming narrow by making the first contact position farther from the first rotation axis Ax1.

[0125] The angles θ between the plurality of inclined surfaces 56 and the recording surface 12a are equal to each other. Thus, the lifting tongue 45 of one suspension 37 corresponding to the inclined surface 56B and one suspension 37 corresponding to the inclined surface 56A among the plurality of suspensions 37 is likely to abut against the inclined surface 56 after the lifting tongue 45 of one suspension 37 corresponding to the inclined surface 56C. Therefore, the first contact position becomes easy to be away from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2. The HDD 10 of this embodiment can suppress the narrowing of the data area 12c of the magnetic disk 12 by making the first contact position farther from the first rotation axis Ax1.

[0126] In the circumferential direction around the second rotation axis Ax2, the end 61 of each of the plurality of inclined surfaces 56 is arranged at the same position as the end 61 of one of the plurality of inclined surfaces 56 that is adjacent to the inclined surface 56 and closer to the bottom wall 21 than the inclined surface 56, or at a position closer to the first rotation axis Ax1 than the end 61 of the inclined surface 56. That is, the end 61 of the inclined surface 56 is not farther from the first rotation axis Ax1 than the end 61 of the inclined surface 56 that is closer to the bottom wall 21. Thus, the lifting tongue 45 of the suspension 37 that is closer to the bottom wall 21 among the plurality of suspensions 37 is more likely to abut against the inclined surface 56 after the other lifting tongues 45. That is, the range of deviation of the position where the lifting tongue 45 of the suspension 37 that is closer to the bottom wall 21 abuts against the inclined surface 56 is farther from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2. Therefore, the first contact position becomes easier to be farther from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2. The HDD 10 of the present embodiment can suppress the narrowing of the data area 12 c of the magnetic disk 12 by making the first contact position farther from the first rotation axis Ax1 .

[0127] The end 62 of the inclined surface 56B on the outer direction Do is closer to the first rotation axis Ax1 than the end 62 of the inclined surface 56A on the outer direction Do, and is farther from the first rotation axis Ax1 than the end 62 of the inclined surface 56C on the outer direction Do. Therefore, the lengths of the inclined surfaces 56A, 56B, and 56C in the circumferential direction around the second rotation axis Ax2 can be set to be substantially the same. Therefore, the ramp loading mechanism 17 of this embodiment can set the lengths (heights) of the lifting tongue 45 to be moved by the plurality of inclined surfaces 56 in the Z direction to be substantially the same, and can stably make the magnetic head 14 at the unloading position Pu leave from the recording surface 12a.

[0128] The further away the multiple inclined surfaces 56 are from the bottom wall 21 in the Z direction, the closer the end 61 is to the first rotation axis Ax1. Therefore, the lifting tongue 45 of the suspension 37 that is closer to the bottom wall 21 among the multiple suspensions 37 is more likely to abut against the inclined surface 56 after the other lifting tongues 45. That is, the range of deviation of the position where the lifting tongue 45 of the suspension 37 closer to the bottom wall 21 abuts against the inclined surface 56 is farther from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2. Therefore, the first contact position becomes easier to move away from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2. The HDD 10 of this embodiment can suppress the narrowing of the data area 12c of the magnetic disk 12 by making the first contact position farther from the first rotation axis Ax1.

[0129] When the plurality of suspensions 37 rotate from the loading position P1 to the unloading position Pu, the inclined surface 56B comes into contact with the lifting tongue 45 before the inclined surface 56A comes into contact with the lifting tongue 45 and after the inclined surface 56C comes into contact with the lifting tongue 45. That is, the lifting tongue 45 of the suspension 37 closer to the bottom wall 21 among the plurality of suspensions 37 comes into contact with the inclined surface 56 after the other lifting tongues 45. The HDD 10 of the present embodiment makes the lifting tongue 45 of a specific one of the plurality of suspensions 37 come into contact with the inclined surface 56 first, thereby preventing the size of the data area 12c of the magnetic disk 12 from becoming unstable.

[0130] The lifting tongues 45 of the plurality of suspensions 37 overlap in the Z direction. In other words, the lifting tongues 45 of the plurality of suspensions 37 are arranged at substantially the same position in the circumferential direction around the second rotation axis Ax2. Thus, in the HDD 10 of the present embodiment, the lifting tongues 45 of one suspension 37 corresponding to the inclined surface 56B and one suspension 37 corresponding to the inclined surface 56A among the plurality of suspensions 37 are likely to abut against the inclined surface 56 after the lifting tongue 45 of one suspension 37 corresponding to the inclined surface 56C. In addition, the ranges RA and RB of the deviations of the positions at which the lifting tongues 45 of the suspensions 37 corresponding to the inclined surfaces 56A and 56B abut against the inclined surface 56 are away from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2. Therefore, the first contact position is likely to be away from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2. The HDD 10 of the present embodiment can suppress the data area 12 c of the magnetic disk 12 from becoming narrower by moving the first contact position further away from the first rotation axis Ax1 .

[0131] (Second embodiment)

[0132] Below, refer to Figure 5 and Figure 6The second embodiment is described. In the following description of the embodiments, components having the same functions as components already described are sometimes given the same reference numerals as the components already described, and the description is omitted. In addition, multiple components given the same reference numerals are not limited to having all functions and properties in common, and may also have different functions and properties according to each embodiment.

[0133] Figure 5 1 is an illustrative side view schematically showing a portion of the slope loading mechanism 17 according to the second embodiment. In the slope loading mechanism 17 according to the second embodiment, a plurality of slopes 156 are provided instead of the plurality of slopes 56. The slopes 156 are the same as the slopes 56 according to the first embodiment except for the following points.

[0134] In the second embodiment, the ends 61 of the plurality of inclined surfaces 156 in the inner direction Di are arranged at the same position in the circumferential direction around the second rotation axis Ax2. In addition, even if an error occurs in the positions of the ends 61 of the plurality of inclined surfaces 156 due to deformation, dimensional tolerance or other reasons, the ends 61 of the plurality of inclined surfaces 156 are treated as ends arranged at the same position. The positions of the ends 61 of the plurality of inclined surfaces 156 may also be different from each other.

[0135] Regarding the plurality of inclined surfaces 156 of the second embodiment, the further away from the bottom wall 21 in the Z direction, the smaller the angle between the corresponding recording surface 12a. Therefore, the angle between each of the plurality of inclined surfaces 156 and the recording surface 12a is the same as or smaller than the angle between one of the plurality of inclined surfaces 156 that is adjacent to the inclined surface 156 and closer to the bottom wall 21 than the inclined surface 156 and the recording surface 12a.

[0136] The angle between one of the plurality of inclined surfaces 156 and the recording surface 12a may be the same as the angle between another adjacent inclined surface 156 and the recording surface 12a among the plurality of inclined surfaces 156. However, in the present embodiment, the angle between the one of the plurality of inclined surfaces 156 farthest from the bottom wall 21 and the recording surface 12a is smaller than the angle between the one of the plurality of inclined surfaces 156 closest to the bottom wall 21 and the recording surface 12a.

[0137] Figure 6 156A, 156B, and 156C of the ramp loading mechanism 17 according to the second embodiment are schematically shown in a side view. Figure 6 The multiple inclined surfaces 156 are described in detail by taking EMBODIMENT as an example.

[0138] like Figure 6As shown, the plurality of inclined surfaces 156 include inclined surfaces 156A, 156B, and 156C. The inclined surface 156A is an example of a first inclined surface. The inclined surface 156B is an example of a second inclined surface. The inclined surface 156C is an example of a third inclined surface. The inclined surfaces 156A, 156B, and 156C are the same as the inclined surfaces 56A, 56B, and 56C of the first embodiment except for the points described below.

[0139] In the present embodiment, the angle θB between the inclined surface 156B and the recording surface 12a is smaller than the angle θA between the inclined surface 156A and the recording surface 12a, and is larger than the angle θC between the inclined surface 156C and the recording surface 12a. Therefore, in terms of design, when the plurality of suspensions 37 rotate from the loading position P1 to the unloading position Pu, the inclined surface 156B abuts against the lifting tongue 45 before the inclined surface 156A abuts against the lifting tongue 45 and after the inclined surface 156C abuts against the lifting tongue 45.

[0140] Similar to the first embodiment, the range RB of the position where the lifting tab 45 can contact the inclined surface 156B is longer than the range RA of the position where the lifting tab 45 can contact the inclined surface 156A. Also, the range RB is shorter than the range RC of the position where the lifting tab 45 can contact the inclined surface 156C.

[0141] The center of range RA is farther from the first rotation axis Ax1 than the center of range RB, and the center of range RB is farther from the first rotation axis Ax1 than the center of range RC. The ends of ranges RA, RB, and RC in the outer direction Do are arranged at approximately the same position in the circumferential direction around the second rotation axis Ax2.

[0142] As described above, similarly to the first embodiment, in the ramp loading mechanism 17 of the second embodiment, first, the contact position tends to become farther from the first rotation axis Ax1. Therefore, the data area 12c tends to become wider.

[0143] In the plurality of inclined surfaces 156 of the HDD 10 of the second embodiment described above, instead of the end 61 being provided at the position of the first embodiment, the angle θB between the inclined surface 156B and the recording surface 12a is smaller than the angle θA between the inclined surface 156A and the recording surface 12a. Furthermore, the angle θB is larger than the angle θC between the inclined surface 156C and the recording surface 12a. In this case, the lifting tongue 45 of one of the plurality of suspensions 37 corresponding to the inclined surface 156B and one of the suspensions 37 corresponding to the inclined surface 156A is likely to abut against the inclined surface 156 after the lifting tongue 45 of one of the plurality of suspensions 37 corresponding to the inclined surface 156C. The deviation of the position where the lifting tongue 45 abuts against the inclined surface 156C is larger than the deviation of the position where the lifting tongue 45 abuts against the inclined surface 156A and the position where the lifting tongue 45 abuts against the inclined surface 156B. In the above-mentioned inclined surfaces 156A, 156B, and 156C, the deviation ranges RA and RB of the positions where the lifting tongue 45 contacts the inclined surfaces 156A and 156B are away from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2. In the circumferential direction around the second rotation axis Ax2, the more the deviation ranges RA, RB, and RC overlap, the easier it is for the lifting tongues 45 of the plurality of suspensions 37 to contact the plurality of inclined surfaces 156 first. Therefore, the first contact position becomes easy to be away from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2. Based on the above, the HDD 10 of this embodiment can suppress the narrowing of the data area 12c of the magnetic disk 12 by making the first contact position further away from the first rotation axis Ax1.

[0144] The end portions 61 of the plurality of inclined surfaces 156 in the inner direction Di are arranged at the same position in the circumferential direction around the second rotation axis Ax2. As a result, the lifting tongue 45 of one suspension 37 corresponding to the inclined surface 156B and one suspension 37 corresponding to the inclined surface 156A among the plurality of suspensions 37 becomes easy to contact the inclined surface 156 after the lifting tongue 45 of one suspension 37 corresponding to the inclined surface 156C. Therefore, the first contact position becomes easy to move away from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2. The HDD 10 of this embodiment can suppress the narrowing of the data area 12c of the magnetic disk 12 by making the first contact position further away from the first rotation axis Ax1.

[0145] The angle between each of the plurality of inclined surfaces 156 and the recording surface 12a is the same as or smaller than the angle between one of the plurality of inclined surfaces 156 that is adjacent to the inclined surface 156 and closer to the bottom wall 21 and the recording surface 12a. That is, the angle between the inclined surface 156 and the recording surface 12a does not become larger than the angle between the inclined surface 156 that is closer to the bottom wall 21 and the recording surface 12a. As a result, the lifting tongue 45 of the suspension 37 that is closer to the bottom wall 21 among the plurality of suspensions 37 is more likely to abut against the inclined surface 156 after the other lifting tongues 45. That is, the range of deviation of the position where the lifting tongue 45 of the suspension 37 that is closer to the bottom wall 21 abuts against the inclined surface 156 is farther from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2. Therefore, the contact position first becomes easier to be farther from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2. The HDD 10 of the present embodiment can suppress the narrowing of the data area 12 c of the magnetic disk 12 by making the first contact position farther from the first rotation axis Ax1 .

[0146] The further away the multiple inclined surfaces 156 are from the bottom wall 21 in the Z direction, the smaller the angle between them and the recording surface 12a. Therefore, the lifting tongue 45 of the suspension 37 that is closer to the bottom wall 21 among the multiple suspensions 37 is more likely to abut against the inclined surface 156 after the other lifting tongues 45. That is, the range of deviation of the position where the lifting tongue 45 of the suspension 37 closer to the bottom wall 21 abuts against the inclined surface 156 is farther away from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2. Therefore, the first contact position becomes easier to be away from the first rotation axis Ax1 in the circumferential direction around the second rotation axis Ax2. The HDD 10 of this embodiment can suppress the narrowing of the data area 12c of the magnetic disk 12 by making the first contact position further away from the first rotation axis Ax1.

[0147] 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.

[0148] Several embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the scope of the purpose of the invention. These embodiments and their variations are included in the scope and purpose 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 having a recording surface, and arranged in an axial direction of a first rotation axis intersecting the recording surface; A motor that rotates the plurality of disks around the first rotation axis; a plurality of magnetic heads configured to read and write information on the plurality of magnetic disks; a ramp, away from the first rotation axis; a frame having a wall on which the motor is mounted, and accommodating the plurality of magnetic disks, the motor, the plurality of magnetic heads, and the ramp; A plurality of suspensions, each having a sliding portion separated from a second rotation axis, and a holding portion located between the sliding portion and the second rotation axis and holding the magnetic head, and configured to rotate about the second rotation axis between a loading position and an unloading position, wherein the loading position is a position where the magnetic head is located on the recording surface, and the unloading position is a position where the sliding portion is supported on the slope so that the magnetic head is further away from the recording surface in the axial direction of the first rotation axis than the magnetic head at the loading position, and the second rotation axis is configured to be substantially parallel to the first rotation axis; as well as a plurality of inclined surfaces, provided on the slope, respectively extending at an obtuse angle relative to the recording surface in a manner that the farther from the first rotating axis in the circumferential direction around the second rotating axis, the farther from the recording surface in the axial direction of the first rotating axis, and supporting the sliding portion when the plurality of suspensions rotate from the loading position to the unloading position, The plurality of inclined surfaces include a first inclined surface, a second inclined surface, and a third inclined surface for supporting the sliding portion of a different one of the plurality of suspensions. The second inclined surface is farther from the wall in the axial direction of the first rotating shaft than the first inclined surface, and is closer to the wall in the axial direction of the first rotating shaft than the third inclined surface. Among the plurality of inclined surfaces, The end of the second inclined surface in the inner direction is closer to the first rotation axis than the end of the first inclined surface in the inner direction, and is farther from the first rotation axis than the end of the third inclined surface in the inner direction, and the inner direction is a direction around the second rotation axis toward the first rotation axis, or, An angle between the second inclined surface and the recording surface is smaller than an angle between the first inclined surface and the recording surface, and is larger than an angle between the third inclined surface and the recording surface.

2. The disk device according to claim 1, Among the plurality of inclined surfaces, an end of the second inclined surface in the inner direction is closer to the first rotation axis than an end of the first inclined surface in the inner direction, and is farther from the first rotation axis than an end of the third inclined surface in the inner direction. The angles between the plurality of inclined surfaces and the recording surface are equal to each other.

3. The disk device according to claim 2, In the circumferential direction around the second rotation axis, the inner end portion of each of the multiple inclined surfaces is set at the following position, which is the same position as the inner end portion of an inclined surface among the multiple inclined surfaces that is adjacent to the inclined surface and closer to the wall than the inclined surface, or is a position closer to the first rotation axis than the inner end portion of the one inclined surface.

4. The disk device according to claim 2 or 3, An end of the second inclined surface in the outer direction opposite to the inner direction is closer to the first rotation axis than an end of the first inclined surface in the outer direction, and is farther from the first rotation axis than an end of the third inclined surface in the outer direction.

5. The disk device according to claim 2 or 3, The farther the plurality of inclined surfaces are from the wall in the axial direction of the first rotation axis, the closer the ends of the plurality of inclined surfaces in the inner direction are to the first rotation axis.

6. The disk device according to claim 1, Among the plurality of inclined surfaces, an angle between the second inclined surface and the recording surface is smaller than an angle between the first inclined surface and the recording surface, and larger than an angle between the third inclined surface and the recording surface. Ends of the plurality of inclined surfaces in the inner direction are arranged at the same position in the circumferential direction around the second rotation axis.

7. The disk device according to claim 6, An angle between each of the plurality of inclined surfaces and the recording surface is the same as or smaller than an angle between one of the plurality of inclined surfaces that is adjacent to the inclined surface and closer to the wall than the inclined surface and the recording surface.

8. The disk device according to claim 6 or 7, The angle between the plurality of inclined surfaces and the recording surface decreases as the plurality of inclined surfaces are farther from the wall in the axial direction of the first rotation axis.

9. The disk device according to any one of claims 1 to 3, 6 and 7, When the plurality of suspensions rotate from the loading position to the unloading position, the second slope comes into contact with the sliding portion before the first slope comes into contact with the sliding portion and after the third slope comes into contact with the sliding portion.

10. The disk device according to any one of claims 1 to 3, 6 and 7, The sliding portions of the plurality of suspensions overlap each other in the axial direction of the first rotating shaft.

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