Magnetic disk device

Abstract

The invention provides a magnetic disk device which can easily position and fix a slope on a housing and can reduce a processing area of the housing. A magnetic disk device according to an embodiment includes a base having a slope setting portion, a magnetic disk, an actuator that movably supports and drives a head, and a slope that is provided on the slope setting portion and holds the head at an unloading position. The slope setting portion has a setting surface, a threaded hole provided in the setting surface, a cylindrical support sleeve provided upright on the setting surface and communicating with the threaded hole, and a first engagement portion provided on the support sleeve. The slope is provided with a guide surface of the supporting head, an opposite surface opposite to the setting surface, a clamping hole which is opened on the opposite surface and is inserted with the supporting sleeve, and a second clamping part which is clamped with the first clamping part to limit the slope to rotate around the supporting sleeve; and the slope is fixed on the slope setting part through a fixing screw which passes through the clamping hole and is screwed into the threaded hole.

Description

[0001] This application claims the priority of Japanese Patent Application No. 2023-141363 (filing date: August 31, 2023) as a basic application. This application incorporates all the contents of the basic application by reference. Technical Field

[0002] This embodiment relates to a magnetic disk device. Background Art

[0003] As a magnetic disk device, for example, a hard disk drive (HDD) has a magnetic disk that is rotatably arranged and a magnetic head that records and reads data on the magnetic disk. The head is supported by a suspension of an actuator. The head moves between a loading position on the magnetic disk and an unloading position outside the magnetic disk by the actuator. In addition, the HDD has a slope that holds the head moved to the unloading position.

[0004] Usually, the ramp is fixed to the housing by screwing in a state where it is positioned at a predetermined position of the housing of the HDD. As a method for positioning the ramp, a method of screwing the ramp against the wall of the housing with a pin as the rotation center is often used.

[0005] As described above, it is necessary to provide a hole for inserting a pin, a threaded hole, and a contact wall in the slope setting portion of the housing, and it is necessary to perform a lot of processing on the housing. Summary of the invention

[0006] The embodiments of the present invention provide a disk device that can easily position and fix a ramp to a housing and reduce a processing area of ​​the housing.

[0007] According to this embodiment, the magnetic disk device comprises: a base having a ramp setting portion, a magnetic disk rotatably set on the base, an actuator supporting and driving the head in a manner that the head can move relative to the magnetic disk, and a ramp set on the ramp setting portion and holding the head in an unloading position. The ramp setting portion comprises a setting surface, a threaded hole set on the setting surface, a cylindrical support sleeve erected on the setting surface and connected to the threaded hole, and a first engaging portion set on the support sleeve. The ramp comprises a guide surface supporting the head, an opposing surface facing the setting surface, an engaging hole opened on the opposing surface and through which the support sleeve is inserted, and a second engaging portion engaging with the first engaging portion to restrict the ramp from rotating around the support sleeve, and the ramp is fixed to the ramp setting portion by a fixing screw passing through the engaging hole and screwed into the threaded hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is an exploded perspective view of the hard disk drive (HDD) according to the first embodiment.

[0009] Figure 2 It is a side view schematically showing a magnetic head, a suspension, and a magnetic disk in the HDD.

[0010] Figure 3 It is a perspective view showing a slope setting portion and a slope of the housing of the HDD.

[0011] Figure 4 is a perspective view showing the slope.

[0012] Figure 5 is a side view showing a part of the slope in an enlarged manner.

[0013] Figure 6 2 is a perspective view showing the slope setting portion.

[0014] Figure 7 It is along Figure 3 A cross-sectional view of the slope setting portion and the slope along line AA.

[0015] Figure 8 It is a cross-sectional view of a slope setting portion and a slope of an HDD according to a first modification.

[0016] Fig. 9 It is a cross-sectional view of a slope setting portion and a slope of an HDD according to a second modification.

[0017] Fig.10 It is a perspective view showing a slope installation portion of a HDD according to a second embodiment.

[0018] Fig.11 It is a perspective view showing a slope setting portion and a sleeve of the slope of the HDD according to the second embodiment.

[0019] Fig.12 It is a cross-sectional view of a slope installation portion and a slope of a HDD according to a second embodiment.

[0020] Fig.13 It is a perspective view showing a slope installation portion of a HDD according to a third embodiment.

[0021] Fig.14 It is a cross-sectional view of a slope installation portion and a slope of a HDD according to a third embodiment.

[0022] Fig.15 It is a perspective view showing a slope installation portion of a HDD according to a fourth embodiment.

[0023] Fig.16 It is a cross-sectional view of a slope installation portion and a slope of a HDD according to a fourth embodiment.

[0024] Description of Reference Numerals

[0025] 10 ... housing, 11 ... magnetic disk device, 12 ... base, 12a ... bottom wall, 12b ... side wall, 17 ... magnetic head, 18 ... magnetic disk, 19 ... spindle motor, 22 ... actuator assembly, 25 ... ramp loading mechanism, 50 ... ramp setting portion, 50a ... setting surface, 52 ... threaded hole, 54 ... support sleeve, 56 ... positioning recess, 57 ... groove, 60 ... ramp, 62 ... ramp body, 66 ... support bracket, 70 ... second sleeve, 72 ... positioning protrusion DETAILED DESCRIPTION

[0026] Hereinafter, a magnetic disk device according to an embodiment will be described with reference to the drawings.

[0027] In addition, the disclosure is always just an example, and the content that can be easily thought of by those skilled in the art while maintaining the main purpose of the invention is of course also included in the scope of the present invention. In addition, in order to explain more clearly, the drawings sometimes schematically show the width, thickness, shape, etc. of each part compared with the actual form, but it is always just an example and does not limit the interpretation of the present invention. In addition, in this specification and each figure, the same reference numerals are marked for the same elements as those described in the figures that appeared previously, and the detailed description is sometimes appropriately omitted or simplified.

[0028] (First embodiment)

[0029] As the magnetic disk device, a hard disk drive (HDD) according to the first embodiment will be described in detail. Figure 1 This is an exploded perspective view of the HDD according to the first embodiment, showing the HDD with the top cover removed.

[0030] like Figure 1 As shown, the HDD 11 has a rectangular housing 10. The housing 10 has a rectangular box-shaped base 12 with an open upper surface and a cover (top cover) 14. The base 12 has a rectangular bottom wall 12a and a side wall 12b erected along the periphery of the bottom wall 12a, and is integrally formed of, for example, aluminum. The cover 14 is formed into a rectangular plate shape, for example, from stainless steel. The cover 14 is screwed to the side wall 12b of the base 12 by a plurality of screws 13, and the upper opening of the base 12 is sealed airtightly.

[0031] In the housing 10, there are provided a plurality of (e.g., 5) magnetic disks 18 as disk-shaped recording media, and a spindle motor 19 that supports and rotates the magnetic disks 18. The spindle motor 19 is disposed on the bottom wall 12a. Each magnetic disk 18 has a substrate formed in the shape of a disk, for example, with a diameter of 95 mm (3.5 inches), and a magnetic recording layer formed on the upper surface and the lower surface of the substrate. Each magnetic disk 18 is coaxially fitted into the hub of the spindle motor 19 and is clamped by a clamping spring 20. Thus, the magnetic disk 18 is supported in a state of being located parallel to the bottom wall 12a of the base 12. The plurality of magnetic disks 18 are rotated in the direction of arrow B at a predetermined rotation speed by the spindle motor 19. In addition, the number of magnetic disks 18 mounted is not limited to 5, and may be less than 4 or more than 6.

[0032] In the housing 10, there are provided a plurality of magnetic heads 17 for writing and reading information on the magnetic disk 18, and an actuator assembly 22 for supporting the magnetic heads 17 so as to be movable relative to the magnetic disk 18. In addition, in the housing 10, there are provided a voice coil motor (VCM) 24 for rotating and positioning the actuator assembly 22, a ramp loading mechanism 25 for holding the magnetic head 17 at an unloading position away from the magnetic disk 18 when the magnetic head 17 moves to the outermost periphery of the magnetic disk 18, and a substrate unit (FPC unit) 21 on which electronic components such as a conversion connector are mounted.

[0033] The actuator assembly 22 includes an actuator block 29 rotatably supported around a support shaft 28, a plurality of arms 32 extending from the actuator block 29, and a suspension assembly 30 extending from each arm 32. The support shaft 28 is erected on the bottom wall 12a. The magnetic head 17 is supported at the top end of each suspension assembly 30.

[0034] The actuator assembly 22 has a support frame (not shown) extending from the actuator block 29 in the opposite direction to the arm 32, and the support frame supports the voice coil 34. The voice coil 34 is located between a pair of yokes 37 fixed to the base 12, and together with the yokes 37 and a magnet fixed to one of the yokes, constitutes the VCM 24.

[0035] The FPC unit 21 includes a base 21a fixed to the bottom wall 12a, a slender belt-shaped relay portion 21b extending from the base 21a, and a joint portion 21c provided continuously with the top end of the relay portion 21b. The base 21a, the relay portion 21b, and the joint portion 21c are formed by a flexible printed wiring substrate (FPC). The joint portion 21c is mounted on the actuator block 29.

[0036] A printed circuit board 27 is screwed onto the outer surface of the bottom wall 12a of the base 12. The base 21a of the FPC unit 21 is connected to the printed circuit board 27 via a connector (not shown). The printed circuit board 27 constitutes a control unit (controller) that controls the operation of the spindle motor 19 and controls the operation of the VCM 24 and the magnetic head 17 via the base unit 21.

[0037] Figure 2 It is a side view showing the magnetic head and the magnetic disk in a floating state.

[0038] As shown in the figure, the magnetic disk 18 has a disk-shaped substrate 101 made of a non-magnetic material (such as glass). An underlayer 102, a magnetic recording layer 103, and a protective film 104 are sequentially stacked on each surface of the substrate 101. The magnetic disk 18 is rotated in the direction of arrow B at a predetermined speed by a spindle motor 19.

[0039] The suspension assembly 30 includes a suspension 26, a wiring member (flexure) 40 mounted on the suspension 26, and a protrusion 46 protruding from the top of the suspension 26. The magnetic head 17 is supported by a gimbal portion 41 of the wiring member 40. The magnetic head 17 is electrically connected to the FPC unit 21 via the wiring member 40.

[0040] The magnetic head 17 is configured as a floating type head, and has a slider 42 formed in a substantially rectangular parallelepiped shape, and a head 44 formed at the end of the outflow end (trailing) side of the slider 42. The head 44 includes a write head and a read head. The magnetic head 17 is maintained in a state of floating from the surface of the magnetic disk 18 by a predetermined amount by the air flow C generated between the disk surface and the slider 42 due to the rotation of the magnetic disk 18. The direction of the air flow C is consistent with the rotation direction B of the magnetic disk 18. Accompanying the rotation of the magnetic disk 18, the magnetic head 17 moves relative to the magnetic disk 18 in the direction opposite to the rotation direction B (circumferential direction).

[0041] Next, the slope of the slope loading mechanism 25 will be described.

[0042] Figure 3 is a three-dimensional diagram showing a slope setting portion and a slope of a housing, Figure 4 is a perspective view showing a slope, Figure 5 It is a side view showing a part of the slope in an enlarged manner.

[0043] like Figure 3 As shown, the base 12 of the housing 10 integrally has a slope setting portion 50 for setting the slope 60. The slope setting portion 50 is protrudingly set as a pedestal portion at the corner of the bottom wall 12a and the side wall 12b of the base 12. The slope setting portion 50 has a flat setting surface 50a. The setting surface 50a is located approximately in the middle of the height direction of the side wall 12b and extends approximately parallel to the bottom wall 12a.

[0044] like Figure 3 as well as Figure 4 As shown, the ramp 60 includes a ramp body 62 formed into a rectangular plate, five guide blocks 64 protruding from one surface of the ramp body 62, and a support bracket 66 protruding from the other surface of the ramp body 62, and is integrally formed of, for example, synthetic resin or metal. Figure 1 as well as Figure 3 As shown, the support bracket 66 is placed on the installation surface 50 a and is fixed to the installation surface 50 a by fixing screws 80 .

[0045] By fixing the support bracket 66 to the slope setting portion 50, the slope body 62 is arranged to stand substantially vertically with respect to the bottom wall 12a of the base 12. The guide block 64 is located near the peripheral edge of the corresponding magnetic disk 18.

[0046] like Figure 3 as well as Figure 4 As shown in FIG. 1 , the guide block 64 has an elongated rectangular parallelepiped shape and extends substantially parallel to the bottom wall 12a. Five guide blocks 64 are arranged at predetermined intervals in the axial direction of the magnetic disk 18. A rectangular recess (notch) 67 is formed at one end of each guide block 64 on the magnetic disk 18 side. When the ramp 60 is set on the ramp setting portion 50, the outer peripheral edge portions of the five magnetic disks 18 are located in the recesses 67 of the corresponding guide blocks 64 with gaps therebetween.

[0047] Each guide block 64 has an upper guide surface (first guide surface) Ga for guiding and supporting the protrusion 46 of the lower head suspension assembly 30, and a lower guide surface (second guide surface) Gb for guiding and supporting the protrusion 46 of the upper head suspension assembly 30. The upper guide surface Ga and the lower guide surface Gb are opposite to each other and are provided substantially perpendicularly to one surface of the ramp body 62.

[0048] The upper guide surfaces Ga and lower guide surfaces Gb of the five guide blocks 64 are arranged to match the height of the corresponding suspension assembly 30. Each guide surface Ga and Gb extends substantially along the radial direction of the magnetic disk 18 to the vicinity of the outer periphery of the magnetic disk 18 and is arranged on the moving path of the protrusion 46.

[0049] Figure 5 It is a side view showing a part of the magnetic disk, the head, and the ramp in an enlarged manner. As shown in the figure, when the HDD is not in operation, if the magnetic head 17 leaves the outer periphery of the magnetic disk 18 and moves to the unloading position, the tab 46 of the suspension assembly 30 climbs onto the upper guide surface Ga or the lower guide surface Gb of the ramp 60. Then, the tab 46 moves to the unloading position along the upper guide surface Ga or the lower guide surface Gb of the ramp 60 and stops. Thus, the magnetic head 17 is held in the unloading position away from the magnetic disk 18 by the ramp 60.

[0050] Next, the mounting and positioning structure of the ramp 60 will be described.

[0051] Figure 6 is a perspective view showing a slope setting portion, Figure 7 It is along Figure 3 A cross-sectional view of the slope setting portion and the slope along line AA.

[0052] As shown in the figure, a threaded hole 52 extending through the setting surface 50a is formed in the slope setting portion 50. That is, the threaded hole 52 extends approximately vertically from the setting surface 50a toward the bottom wall 12a, and opens at the setting surface 50a. In addition, the slope setting portion 50 has a cylindrical support sleeve 54 protruding from the setting surface 50a. The support sleeve 54 is arranged coaxially with the threaded hole 52. The inner hole of the support sleeve 54 is formed to have a diameter equal to the diameter of the threaded hole 52, and is coaxially connected to the threaded hole 52. According to the present embodiment, the support sleeve 54 is formed integrally with the slope setting portion 50 by the same metal as the base 12.

[0053] The top end surface of the support sleeve 54 forms an annular abutment surface 54a. The support sleeve 54 has a pair of positioning recesses (or notches) 56 formed on the abutment surface 54a. Each positioning recess 56 is formed, for example, in a substantially rectangular shape, and has a pair of side surfaces 56b extending in the axial direction of the support sleeve 54 and facing each other at intervals in the circumferential direction of the support sleeve 54, and an arc-shaped bottom surface 56a located between the pair of side surfaces 56b and substantially parallel to the setting surface 50a. In one example, the pair of positioning recesses 56 are provided 180 degrees apart in the circumferential direction.

[0054] like Figure 7 As shown, the support bracket 66 of the ramp 60 has an upper surface S1 and a lower surface S2 that are substantially parallel to each other and are opposite to each other, and a through hole 68 formed through the support bracket 66. The through hole 68 extends orthogonally to the upper surface S1 and the lower surface S2, and opens on the upper surface S1 and the lower surface S2. The diameter of the through hole 68 is substantially consistent with the outer diameter of the support sleeve 54. The support bracket 66 has a cylindrical second sleeve 70 that is fitted into the through hole 68. In this embodiment, the ramp 60 is formed of a synthetic resin, and the second sleeve 70 is formed of a metal.

[0055] The second sleeve 70 has an outer diameter that is substantially equal to the diameter of the through hole 68, and an inner diameter that is substantially equal to or slightly larger than the diameter of the threaded hole 52. The axial length of the second sleeve 70 is formed to be approximately half of the axial length of the through hole 68. The second sleeve 70 is fitted into the upper half of the through hole 68. The upper end surface of the second sleeve 70 is located in substantially the same plane as the upper surface S1 of the bracket 66. The lower end surface of the second sleeve 70 constitutes a second abutting surface 70a that can abut against the abutting surface 54a of the support sleeve 54. Moreover, the second sleeve 70 has a pair of positioning protrusions 72 protruding downward from the lower end surface. A pair of positioning protrusions (only one side is shown) 72 are arranged at intervals of approximately 180 degrees in the circumferential direction of the second sleeve 70. The protrusion 72 has a size and shape that can engage with a pair of recesses 56 of the support sleeve 54. More specifically, each convex portion 72 has a circumferential width smaller than the circumferential width of the concave portion 56 and a protruding height shorter than the axial depth of the concave portion 56. Thus, the convex portion 72 can abut against any side surface 56b of the concave portion 56.

[0056] like Figure 7 As shown, when the support bracket 66 is set in the slope setting part 50, the support sleeve 54 is inserted and inserted into the through hole 68 of the support bracket 66. The lower end surface of the second sleeve 70 abuts against the abutment surface 54a of the support sleeve 54, and at the same time, the lower surface (opposing surface) S2 of the support bracket 66 faces the setting surface 50a. In this embodiment, the lower surface S2 of the support bracket 66 abuts against the setting surface 50a. A pair of protrusions 72 are located in the corresponding recesses 56. The support bracket 66 is positioned in the plane direction (direction parallel to the setting surface 50a) by engaging with the peripheral surface of the support sleeve 54. In addition, the support bracket 66 is positioned in the axial direction by abutting against the setting surface 50a and the abutment surface 54a of the support sleeve 54 through the lower surface S2 and the lower end surface of the second sleeve 70, respectively.

[0057] The pair of protrusions 72 of the second sleeve 70 are loosely engaged with the pair of recesses 56 of the support sleeve 54. The support bracket 66 is rotated to a position where each protrusion 72 abuts against the side surface 56b of one side of the recess 56, and the support bracket 66 is abutted, thereby positioning (stopping) the circumferential direction (rotation direction) of the support bracket 66. That is, the side surface 56b on one side forms a limiting surface that limits the rotation of the ramp 60. In addition, the limiting surface 56b only needs to be able to limit the rotation of the ramp 60, and only needs to extend in a direction intersecting the bottom surface 56a. The limiting surface 56b is not limited to a configuration perpendicular to the bottom surface 56a, and may also extend in a direction inclined at an angle of less than 90 degrees or more than 90 degrees relative to the bottom surface 56a.

[0058] With the support bracket 66 positioned as described above, the fixing screw 80 is passed through the second sleeve 70 of the support bracket 66 and screwed into the threaded hole 52, thereby fixing the support bracket 66 to the slope setting portion 50. Thus, the slope 60 is fixed and arranged at a predetermined position relative to the plurality of magnetic disks 18 and the plurality of magnetic heads 17.

[0059] Furthermore, when the fixing screw 80 is screwed in, the support bracket 66 rotates together with the fixing screw 80, and the pair of protrusions 72 are pressed against the side surfaces 56b of the recess 56. Thus, the support bracket 66 is automatically positioned in the circumferential direction.

[0060] According to the HDD of the first embodiment constructed as described above, in the portion where the ramp 60 is provided, the support sleeve 54 of the ramp provision portion 50 or the second sleeve of the ramp 60 has both the positioning function and the anti-rotation function of the ramp 60. Therefore, it is not necessary to provide a positioning abutment surface or an independent through hole in the base 12 of the housing, and the processing area of ​​the base can be reduced. As a result, the degree of freedom in the design of the base can be increased, and cost reduction and quality improvement due to the reduction in the processing area can be achieved.

[0061] As is apparent from the above, according to the first embodiment, it is possible to provide a disk device in which the ramp can be easily positioned and fixed to the housing and the processing area of ​​the housing can be reduced.

[0062] Next, the slope setting structure of the HDD of the modified example and other embodiments is described. In the modified example and other embodiments described below, the same reference numerals are given to the same parts as the first embodiment, and the detailed description thereof is omitted or simplified, and the parts different from the first embodiment are described in detail.

[0063] (First Modification)

[0064] Figure 8 It is a cross-sectional view of a slope setting portion and a slope of an HDD according to a first modification.

[0065] As shown in the figure, the second sleeve 70 provided on the support bracket 66 of the ramp 60 is not limited to a metal sleeve, and may be integrally formed with the support bracket 66 by synthetic resin, for example. In this case, an independent second sleeve is not required, and the manufacturability and assemblability of the ramp 60 are improved.

[0066] (Second Modification)

[0067] Fig. 9 It is a cross-sectional view of a slope setting portion and a slope of an HDD according to a second modification.

[0068] As shown in the figure, the support sleeve 54 provided on the slope setting portion 50 of the base 12 may also be composed of a sleeve separate from the base 12. That is, the support sleeve 54 formed as a separate body is fixed to the setting surface 50a of the slope setting portion 50. The support sleeve 54 can be fixed to the setting surface 50a by welding, bonding, etc. When the support sleeve 54 is set as a separate component, the processing area of ​​the base 12 can be further reduced.

[0069] (Second embodiment)

[0070] Fig.10 is a perspective view showing a slope setting portion of a HDD according to a second embodiment, Fig.11 1 is a perspective view showing a state in which the second sleeve on the slope side is engaged with the support sleeve of the slope setting portion. Fig.12 It is a cross-sectional view of a slope setting portion and a slope of an HDD according to a first modification.

[0071] like Fig.10 As shown, according to the second embodiment, the support sleeve 54 provided on the installation surface 50a of the slope installation portion 50 is composed of a sleeve as a separate component and is fixed to the installation surface 50a. The depth of the pair of positioning recesses 56 of the support sleeve 54 in the radial direction is smaller than the thickness of the support sleeve 54. Therefore, the recesses 56 are opened only on the abutment surface 54a and the outer peripheral surface of the support sleeve 54, and the inner peripheral surface side of the support sleeve 54 is closed by the peripheral surface 56c.

[0072] In detail, each positioning recess 56 is formed in a substantially rectangular shape, for example, and has a pair of side surfaces 56b extending in the axial direction of the support sleeve 54 and facing each other at a distance in the circumferential direction of the support sleeve 54, an arc-shaped bottom surface 56a located between the pair of side surfaces 56b, and a peripheral surface 56c erected in the axial direction. In one example, the pair of positioning recesses 56 are provided 180 degrees apart in the circumferential direction.

[0073] Fig.11The figure shows a state where only the second sleeve 70 is engaged with the support sleeve 54. As shown in the figure, the second sleeve 70 on the side of the ramp 60 has an outer diameter and an inner diameter that are substantially equal to those of the support sleeve 54. The second sleeve 70 has a pair of positioning protrusions 72 protruding downward from the lower end surface. A pair of positioning protrusions (only one side is shown) 72 is arranged at intervals of approximately 180 degrees in the circumferential direction of the second sleeve 70. The protrusions 72 have a size and shape that can be engaged with the positioning recess 56 of the support sleeve 54. In more detail, each protrusion 72 has a circumferential width that is smaller than the circumferential width of the recess 56, and a protruding height that is shorter than the axial depth of the recess 56. Thus, the protrusion 72 can abut against any side surface (limiting surface) 56b of the recess 56. In this embodiment, the inner circumferential surface of the protrusion 72 engages with the circumferential surface 56c of the positioning recess 56, which helps to position the ramp 60 in the plane direction.

[0074] like Fig.12 As shown in FIG. 1 , when the support bracket 66 is set on the slope setting portion 50, the support sleeve 54 is inserted and fitted into the through hole 68 of the support bracket 66. The lower end surface of the second sleeve 70 abuts against the abutment surface 54a of the support sleeve 54, and at the same time, the lower surface S2 of the support bracket 66 abuts against the setting surface 50a. A pair of protrusions 72 are located in the corresponding recesses 56 (see FIG. 1 ). Fig.11 ). The support bracket 66 is engaged with the peripheral surface of the support sleeve 54, so that the movement in the planar direction (the direction parallel to the setting surface 50a) is restricted, and the positioning in the planar direction is performed. In addition, the support bracket 66 is axially positioned by abutting the setting surface 50a and the abutting surface 54a of the support sleeve 54 through the lower surface S2 and the lower end surface of the second sleeve 70. Moreover, by rotating the support bracket 66 to a position where the protrusion 72 abuts against the side surface 56b of one side of the positioning recess 56, the support bracket 66 is restricted from circumferential (rotational) movement (stopped), and circumferential positioning is performed. According to the present embodiment, the protrusion 72 abuts against the peripheral surface 56c of the recess 56, thereby restricting the movement of the support bracket 66 in the planar direction, which also helps with positioning in the planar direction.

[0075] In a state where the support bracket 66 is positioned, the above-mentioned fixing screw is passed through the second sleeve 70 of the support bracket 66 and screwed into the threaded hole 52 , thereby fixing the support bracket 66 to the slope installation portion 50 .

[0076] In the second embodiment, the other configuration of the HDD is the same as that of the HDD in the above-mentioned first embodiment.

[0077] (Third embodiment)

[0078] Fig.13 1 is a perspective view showing a slope setting portion of a HDD according to a third embodiment. Fig.14It is a cross-sectional view of a slope installation portion and a slope of a HDD according to a third embodiment.

[0079] like Fig.13 As shown, according to the third embodiment, the pair of positioning recesses 56 of the support sleeve 54 have a radial depth smaller than the thickness of the support sleeve 54. Each recess 56 is open only on the inner peripheral surface side of the support sleeve 54, and the outer peripheral surface side of the support sleeve 54 is closed by the peripheral surface 56d.

[0080] Each positioning recess 56 is formed in a substantially rectangular shape, for example, and opens on the inner circumferential surface and the abutting surface 54a of the support sleeve 54. Each positioning recess 56 has a pair of side surfaces 56b extending in the axial direction of the support sleeve 54 and facing each other at a distance in the circumferential direction of the support sleeve 54, an arc-shaped bottom surface 56a located between the pair of side surfaces 56b, and a circumferential surface 56d erected in the axial direction. In one example, the pair of positioning recesses 56 are provided 180 degrees apart in the circumferential direction.

[0081] like Fig.14 As shown, the second sleeve 70 of the support bracket 66 has a pair of positioning protrusions (only one is shown) 72. The protrusions 72 have a size and shape that can be engaged with the pair of recesses 56 of the support sleeve 54. More specifically, each protrusion 72 has a circumferential width smaller than the circumferential width of the recess 56, and a protruding height shorter than the axial depth of the recess 56. Thus, the protrusion 72 can abut against any side surface 56b of the recess 56.

[0082] The support bracket 66 is restricted (stopped) from moving in the circumferential direction (rotational direction) by the convex portion 72 abutting against the side surface 56b of one side of the recess 56, thereby performing circumferential positioning. According to this embodiment, the convex portion 72 abuts against the peripheral surface 56d of the recess 56, thereby restricting the movement of the support bracket 66 in the planar direction, which also helps in the positioning in the planar direction.

[0083] In the third embodiment, the other configuration of the HDD is the same as that of the HDD in the above-mentioned first embodiment.

[0084] (Fourth embodiment)

[0085] Fig.15 1 is a perspective view showing a slope setting portion of a HDD according to a fourth embodiment. Fig.16 It is a cross-sectional view of a slope installation portion and a slope of a HDD according to a fourth embodiment.

[0086] like Fig.15As shown, according to the fourth embodiment, the support sleeve 54 has a positioning recess 56. The positioning recess 56 is formed, for example, in a substantially rectangular shape, and is open on the inner peripheral surface, the outer peripheral surface, and the abutment surface 54a of the support sleeve 54. The positioning recess 56 has a pair of side surfaces 56b that extend in the axial direction of the support sleeve 54 and are spaced apart from each other in the circumferential direction of the support sleeve 54, and an arc-shaped bottom surface 56a located between the pair of side surfaces 56b. According to the present embodiment, the recess 56 also has an arc-shaped groove (or gap) 57 formed on the bottom surface 56a. The groove 57 extends in the circumferential direction between the pair of side surfaces 56b.

[0087] like Fig.16 As shown, the second sleeve 70 provided on the support bracket 66 has a positioning convex portion 72 engaged with the positioning recess 56, and also has a protrusion 72a protruding axially from the positioning convex portion 72. The protrusion 72a is formed in an arc shape corresponding to the groove 57. The support bracket 66 and the second sleeve 70 are assembled on the support sleeve 54 of the ramp setting portion 50, and the positioning convex portion 72 is engaged with the positioning recess 56, and then the protrusion 72a is inserted into the groove 57. By the engagement of the inner circumference of the through hole 68 of the support bracket 66 with the outer circumference of the support sleeve 54, and by the engagement of the protrusion 72a with the groove 57, the movement of the support bracket 66 and the ramp 60 in the plane direction is restricted, and the plane direction positioning is performed. In addition, by the positioning convex portion 72 abutting against the side surface 56b of the positioning recess 56, the rotation of the support bracket 66 is restricted, and the circumferential positioning (rotation prevention) is performed.

[0088] In the fourth embodiment, the other configurations of the HDD are the same as those of the HDD in the above-mentioned first embodiment.

[0089] In the second to fourth embodiments constructed as above, the same effects as those of the first embodiment can be obtained. In addition, according to the second to fourth embodiments, by combining a positioning recess having a peripheral surface or a positioning recess having a groove with a positioning convex portion or a protrusion, the movement of the slope in the planar direction can be restricted, and the slope can be positioned more stably.

[0090] Several embodiments and variations of the present invention are described, but these embodiments and variations are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their variations are included in the scope and gist of the invention, and are included in the invention described in the claims and the scope of their equivalents.

[0091] For example, the positioning recess of the support sleeve and the positioning protrusion of the second sleeve are not limited to the configuration of each being provided with a pair. It is sufficient to provide at least one recess and one protrusion respectively. In addition, it is also possible to provide a configuration in which the positioning protrusion is provided on the support sleeve and the positioning recess is provided on the second sleeve. The positioning recess and the protrusion are not limited to rectangular shapes, and other various shapes can be selected.

Claims

1. A magnetic disk device comprising: A base body having a slope setting portion; A magnetic disk rotatably disposed on the base; an actuator for supporting and driving the head in a manner that enables the head to move relative to the disk; and a ramp, disposed on the ramp-setting portion, to maintain the head in an unloading position, The slope setting portion includes a setting surface, a threaded hole provided on the setting surface, a cylindrical support sleeve provided upright on the setting surface and communicating with the threaded hole, and a first engaging portion provided on the support sleeve. The ramp has a guiding surface for supporting the head, an opposing surface facing the setting surface, an engaging hole opening on the opposing surface and through which the supporting sleeve is inserted, and a second engaging portion engaging with the first engaging portion to limit the ramp from rotating around the supporting sleeve. The ramp is fixed to the ramp setting portion by a fixing screw passing through the engaging hole and screwed into the threaded hole.

2. The magnetic disk device according to claim 1, The support sleeve has an annular abutment surface located at the top end, and the first engaging portion includes a positioning recess having a limiting surface extending in a direction intersecting the circumferential direction of the support sleeve and opening at the abutment surface. The slope includes a second sleeve that is coaxially provided with the engagement hole and abuts against the abutment surface, and a positioning protrusion that protrudes from the second sleeve into the positioning recess and can abut against the restriction surface.

3. The magnetic disk device according to claim 2, The support sleeve is integrally formed with the slope setting portion.

4. The magnetic disk device according to claim 2, The support sleeve is formed by a member separate from the base body and is fixed to the installation surface.

5. The magnetic disk device according to claim 2, The second sleeve is integrally molded with the ramp by resin.

6. The magnetic disk device according to claim 2, The second sleeve is formed of metal and is fitted into the engagement hole of the slope.

7. The magnetic disk device according to claim 2, The positioning recess has a bottom surface located substantially parallel to the installation surface, and two side surfaces extending in the axial direction of the support sleeve and facing each other in a circumferential direction and separated from each other, and is open on the inner circumferential surface and the outer circumferential surface of the support sleeve. One of the two side surfaces forms the restriction surface.

8. The magnetic disk device according to claim 7, The positioning recess comprises a groove arranged on the bottom surface and extending in the circumferential direction, The positioning convex portion has a protrusion engaged with the groove.

9. The magnetic disk device according to claim 2, The positioning recess is open on the abutment surface and the outer peripheral surface of the support sleeve, and has a bottom surface located substantially parallel to the installation surface, two side surfaces extending in the axial direction of the support sleeve and facing each other in the circumferential direction, and a peripheral surface located between the two side surfaces. The positioning protrusion is located in the positioning recess, abuts against one side surface, and engages with the peripheral surface.

10. The magnetic disk device according to claim 2, The positioning recess is open on the abutment surface and the inner peripheral surface of the support sleeve, and has a bottom surface located substantially parallel to the installation surface, two side surfaces extending in the axial direction of the support sleeve and facing each other in the circumferential direction, and a peripheral surface located between the two side surfaces. The positioning protrusion is located in the positioning recess, abuts against one side surface, and engages with the peripheral surface.

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