Magnetic disc device

Abstract

To provide a magnetic disc device capable of easily positioning and fixing a lamp with respect to a housing and reducing a processing region of the housing.SOLUTION: According to an embodiment, a magnetic disc device includes: a base that has a lamp installation part; a magnetic disc; an actuator that movably supports and drives a head; and a lamp that is provided at the lamp installation part and holds the head at an unloading position. The lamp installation part has: an installation surface; a screw hole that is provided on the installation surface; a support sleeve of a cylindrical shape that communicates with the screw hole provided upright on the installation surface; and a first engagement part that is provided at the support sleeve. The lamp has: a guide surface that supports the head; an opposing surface that opposes the installation surface; an engagement hole that opens toward the opposing surface and through which the support sleeve is inserted; and a second engagement part that engages with the first engagement part and regulates the turning of the lamp around the support sleeve, and is configured to be fixed at the lamp installation part with a fixing screw screwed into the screw hole through the engagement hole.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a magnetic disk device. [Background technology]

[0002] As an example of a magnetic disk device, a hard disk drive (HDD) has a rotatable magnetic disk and a magnetic head for recording and reading data on the magnetic disk. The head is supported by a suspension of an actuator. The head is moved by the actuator between a load position on the magnetic disk and an unload position outside the magnetic disk. The HDD also has a ramp that holds the head when it is moved to the unload position. Usually, the lamp is positioned at a specific location in the HDD housing and then fixed to the housing with screws. The most commonly used method for positioning the lamp is to use a pin as the center of rotation and butt the lamp against the wall of the housing and screw it in place. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 2009 / 0290258 [Patent Document 2] U.S. Patent No. 7,697,238 [Patent Document 3] U.S. Patent No. 6,344,950 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, it is necessary to provide the holes for inserting the pins, the screw holes, and the abutment walls in the lamp installation portion of the housing, and therefore it is necessary to perform a large amount of machining on the housing. An object of the embodiments of the present invention is to provide a disk device in which a lamp can be easily positioned and fixed to a housing, and an area of ​​the housing that needs to be machined can be reduced. [Means for solving the problem]

[0005] According to an embodiment, a magnetic disk device includes a base having a ramp installation section, a magnetic disk rotatably mounted on the base, an actuator that supports and drives a head movably relative to the magnetic disk, and a ramp that is mounted on the ramp installation section and holds the head in an unloaded position. The ramp installation section has an installation surface, a screw hole provided on the installation surface, a cylindrical support sleeve that is erected on the installation surface and communicates with the screw hole, and a first engagement section provided on the support sleeve. The ramp has a guide surface that supports the head, an opposing surface that faces the installation surface, an engagement hole that opens into the opposing surface and through which the support sleeve is inserted, and a second engagement section that engages with the first engagement section and restricts the rotation of the ramp around the support sleeve, and is fixed to the ramp installation section by a fixing screw that is screwed into the screw hole through the engagement hole. [Brief description of the drawings]

[0006] [Figure 1] FIG. 1 is an exploded perspective view of a hard disk drive (HDD) according to a first embodiment. [Diagram 2] FIG. 2 is a side view that diagrammatically shows a magnetic head, a suspension, and a magnetic disk in the HDD. [Diagram 3] FIG. 3 is a perspective view showing a lamp installation portion and a lamp of a housing of the HDD. [Figure 4] FIG. 4 is a perspective view showing the lamp. [Diagram 5] FIG. 5 is an enlarged side view of a portion of the lamp. [Figure 6] FIG. 6 is a perspective view showing the lamp installation portion. [Figure 7] 7 is a cross-sectional view of the lamp mounting portion and the lamp taken along line AA in FIG. [Figure 8] FIG. 8 is a cross-sectional view of a lamp installation portion and a lamp of an HDD according to a first modified example. [Figure 9] FIG. 9 is a cross-sectional view of a lamp installation portion and a lamp of an HDD according to a second modified example. [Figure 10] FIG. 10 is a perspective view showing a lamp installation portion of an HDD according to a second embodiment. [Figure 11] FIG. 11 is a perspective view showing a lamp installation portion and a lamp sleeve of an HDD according to a second embodiment. [Figure 12] FIG. 12 is a cross-sectional view of a lamp installation portion and a lamp of an HDD according to a second embodiment. [Figure 13] FIG. 13 is a perspective view showing a lamp installation portion of an HDD according to a third embodiment. [Figure 14] FIG. 14 is a cross-sectional view of a lamp installation portion and a lamp of an HDD according to a third embodiment. [Figure 15] FIG. 15 is a perspective view showing a lamp installation portion of an HDD according to a fourth embodiment. [Figure 16] FIG. 16 is a cross-sectional view of a lamp installation portion and a lamp of an HDD according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] A magnetic disk device according to an embodiment will be described below with reference to the drawings. The disclosure is merely an example, and appropriate modifications that are within the spirit of the invention and that can be easily conceived by a person skilled in the art are naturally included in the scope of the present invention. In addition, in order to make the explanation clearer, the width, thickness, shape, etc. of each part may be shown diagrammatically compared to the actual embodiment, but these are merely examples and do not limit the interpretation of the present invention. In this specification and each figure, elements similar to those described above with respect to the previous figures may be given the same reference numerals, and detailed explanations may be omitted or simplified as appropriate.

[0008] (First embodiment) As a magnetic disk device, a hard disk drive (HDD) according to a first embodiment will be described in detail below. Fig. 1 is an exploded perspective view of the HDD according to the first embodiment with the top cover removed. As shown in FIG. 1, the HDD 11 includes a rectangular housing 10. The housing 10 has a rectangular box-shaped base 12 with an open top, and a cover (top cover) 14. The base 12 has a rectangular bottom wall 12a and a side wall 12b standing along the periphery of the bottom wall 12a, and is integrally molded from, for example, aluminum. The cover 14 is formed into a rectangular plate shape from, for example, stainless steel. The cover 14 is fixed onto the side wall 12b of the base 12 with a plurality of screws 13, and air-tightly closes the upper opening of the base 12.

[0009] In the housing 10, a plurality of magnetic disks 18 (for example, five disks) are provided as disk-shaped recording media, and a spindle motor 19 that supports and rotates the magnetic disks 18 is provided. The spindle motor 19 is disposed on the bottom wall 12a. Each magnetic disk 18 has a substrate formed in a disk shape with a diameter of, for example, 95 mm (3.5 inches) and a magnetic recording layer formed on the upper and lower surfaces of the substrate. Each magnetic disk 18 is coaxially fitted to the hub of the spindle motor 19, and is further clamped by a clamp spring 20. As a result, the magnetic disks 18 are supported in a state in which they are positioned parallel to the bottom wall 12a of the base 12. The plurality of magnetic disks 18 are rotated by the spindle motor 19 in the direction of the arrow B at a predetermined number of revolutions. The number of magnetic disks 18 mounted is not limited to five, and may be four or less, or six or more.

[0010] Inside the housing 10, there are provided a plurality of magnetic heads 17 which write and read information to and from the magnetic disks 18, and an actuator assembly 22 which supports these magnetic heads 17 so that they can move freely relative to the magnetic disks 18. Also provided inside the housing 10 are a voice coil motor (VCM) 24 which rotates and positions the actuator assembly 22, a ramp load mechanism 25 which holds the magnetic heads 17 at an unload position separated from the magnetic disks 18 when the magnetic heads 17 move to the outermost periphery of the magnetic disks 18, and a board unit (FPC unit) 21 on which electronic components such as a conversion connector are mounted.

[0011] The actuator assembly 22 has an actuator block 29 supported rotatably 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. A magnetic head 17 is supported on the tip of each suspension assembly 30. The actuator assembly 22 has a support frame (not shown) that extends from the actuator block 29 in the opposite direction to the arm 32, and this support frame supports a voice coil 34. The voice coil 34 is located between a pair of yokes 37 fixed onto the base 12, and constitutes the VCM 24 together with these yokes 37 and a magnet fixed to one of the yokes.

[0012] The FPC unit 21 has a base portion 21a fixed to the bottom wall 12a, a long and thin strip-shaped relay portion 21b extending from the base portion 21a, and a joint portion 21c provided continuously to the tip of the relay portion 21b. The base portion 21a, the relay portion 21b, and the joint portion 21c are formed of a flexible printed circuit board (FPC). The joint portion 21c is attached to an actuator block 29.

[0013] A printed circuit board 27 is screwed to the outer surface of the bottom wall 12a of the base 12. The base portion 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 also controls the operation of the VCM 24 and the magnetic head 17 via the board unit 21.

[0014] FIG. 2 is a side view showing the magnetic head and the magnetic disk in a floating state. As shown in the figure, the magnetic disk 18 has a disk-shaped substrate 101 made of a non-magnetic material, for example, glass. An underlayer 102, a magnetic recording layer 103, and a protective film 104 are laminated in this order 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. The suspension assembly 30 has a suspension 26, a wiring member (flexure) 40 attached onto the suspension 26, and a tab 46 protruding from the tip 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 above-mentioned FPC unit 21 via the wiring member 40.

[0015] 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 section 44 formed at the trailing end of the slider 42. The head section 44 includes a write head and a read head. The magnetic head 17 is maintained in a state of floating a predetermined distance above the surface of the magnetic disk 18 by an air flow C generated between the disk surface and the slider 42 as the magnetic disk 18 rotates. The direction of the air flow C coincides with the rotation direction B of the magnetic disk 18. As the magnetic disk 18 rotates, the magnetic head 17 runs in the direction opposite to the rotation direction B (circumferential direction) relative to the magnetic disk 18.

[0016] Next, the ramp of the ramp load mechanism 25 will be described. FIG. 3 is a perspective view showing a lamp installation portion of a housing and a lamp, FIG. 4 is a perspective view showing the lamp, and FIG. 5 is an enlarged side view showing a part of the lamp. As shown in Fig. 3, the base 12 of the housing 10 has an integral lamp installation portion 50 for installing a lamp 60. The lamp installation portion 50 is provided as a pedestal protruding from the corner between the bottom wall 12a and the side wall 12b of the base 12. The lamp installation portion 50 has a flat installation surface 50a. The installation surface 50a is located approximately midway in the height direction of the side wall 12b and extends approximately parallel to the bottom wall 12a.

[0017] 3 and 4, the lamp 60 has a lamp body 62 formed in a rectangular plate shape, five guide blocks 64 protruding from one surface of the lamp body 62, and a support bracket 66 protruding from the other surface of the lamp body 62, which are integrally molded from, for example, synthetic resin or metal. As shown in Figs. 1 and 3, the support bracket 66 is placed on the installation surface 50a and is further fixed to the installation surface 50a by a fixing screw 80. By fixing the support bracket 66 to the lamp installation portion 50, the lamp body 62 is arranged in a state in which it stands almost vertically with respect to the bottom wall 12a of the base 12. The guide block 64 is located in the vicinity of the peripheral portion of the corresponding magnetic disk 18.

[0018] 3 and 4, the guide block 64 has an elongated rectangular parallelepiped shape and extends substantially parallel to the bottom wall 12a. The five guide blocks 64 are lined up at a predetermined interval in the axial direction of the magnetic disks 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 installed on the ramp installation section 50, the outer circumferential edges of the five magnetic disks 18 are positioned within the recesses 67 of the corresponding guide blocks 64 with gaps therebetween.

[0019] Each guide block 64 has an upper guide surface (first guide surface) Ga that guides and supports the tab 46 of the down head suspension assembly 30, and a lower guide surface (second guide surface) Gb that guides and supports the tab 46 of the up head suspension assembly 30. The upper guide surface Ga and the lower guide surface Gb face each other and are provided approximately perpendicular to one surface of the lamp body 62. The upper guide surfaces Ga and lower guide surfaces Gb of the five guide blocks 64 are disposed in accordance with the height of the corresponding suspension assemblies 30. Each of the guide surfaces Ga, Gb extends approximately along the radial direction of the magnetic disk 18 to the vicinity of the outer circumferential edge of the magnetic disk 18, and is disposed on the movement path of the tab 46.

[0020] 5 is an enlarged side view of the magnetic disk, the head, and a portion of the ramp. As shown in the figure, when the HDD is not in operation, if the magnetic head 17 moves away from the outer periphery of the magnetic disk 18 toward the unload position, the tab 46 of the suspension assembly 30 rides up onto the upper guide surface Ga or the lower guide surface Gb of the ramp 60. Furthermore, the tab 46 moves along the upper guide surface Ga or the lower guide surface Gb of the ramp 60 to the unload position and stops there. As a result, the magnetic head 17 is held by the ramp 60 at the unload position separated from the magnetic disk 18.

[0021] Next, the mounting and positioning structure for the lamp 60 will be described. 6 is a perspective view showing the lamp mounting portion, and FIG. 7 is a cross-sectional view of the lamp mounting portion and the lamp taken along line AA in FIG. As shown in the figure, the lamp mounting portion 50 has a screw hole 52 extending through the mounting surface 50a. That is, the screw hole 52 extends substantially perpendicularly from the mounting surface 50a toward the bottom wall 12a and opens into the mounting surface 50a. Furthermore, the lamp mounting portion 50 has a cylindrical support sleeve 54 protruding from the mounting surface 50a. The support sleeve 54 is disposed coaxially with the screw hole 52. The inner hole of the support sleeve 54 is formed to have a diameter equal to that of the screw hole 52 and is coaxially connected to the screw hole 52. According to this embodiment, the support sleeve 54 is molded integrally with the lamp mounting portion 50 using the same metal as the base 12.

[0022] The tip surface of the support sleeve 54 constitutes a circular abutment surface 54a. The support sleeve 54 has a pair of positioning recesses (or notches) 56 formed in 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 a distance 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 installation surface 50a. In one example, the pair of positioning recesses 56 are provided 180 degrees apart in the circumferential direction.

[0023] As shown in Fig. 7, the support bracket 66 of the lamp 60 has an upper surface S1 and a lower surface S2 which face each other substantially parallel to each other, and a through hole 68 formed through the support bracket 66. The through hole 68 extends perpendicular to the upper surface S1 and the lower surface S2, and opens to the upper surface S1 and the lower surface S2. The diameter of the through hole 68 is substantially the same as the outer diameter of the support sleeve 54. The support bracket 66 has a cylindrical second sleeve 70 which is fitted into the through hole 68. In this embodiment, the lamp 60 is made of synthetic resin, and the second sleeve 70 is made of metal.

[0024] The second sleeve 70 has an outer diameter that is approximately equal to the diameter of the through hole 68, and an inner diameter that is approximately equal to or slightly larger than the diameter of the screw hole 52. The axial length of the second sleeve 70 is formed to be approximately half 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 approximately flush with the upper surface S1 of the bracket 66. The lower end surface of the second sleeve 70 constitutes a second abutment surface 70a that can abut against the abutment surface 54a of the support sleeve 54. Furthermore, the second sleeve 70 has a pair of positioning protrusions 72 that protrude downward from the lower end surface. The pair of positioning protrusions (only one is shown) 72 are provided at an interval 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 pair of recesses 56 of the support sleeve 54. More specifically, each of the protrusions 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. The protrusions 72 can come into contact with any of the side surfaces 56b of the recess 56.

[0025] As shown in FIG. 7, in a state where the support bracket 66 is installed on the lamp installation portion 50, the support sleeve 54 is inserted and passed through 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 installation surface 50a. In this embodiment, the lower surface S2 of the support bracket 66 abuts against the installation surface 50a. The pair of protrusions 72 are located in the corresponding recesses 56. The support bracket 66 is positioned in a planar direction (direction parallel to the installation surface 50a) by engaging with the circumferential surface of the support sleeve 54. In addition, the support bracket 66 is positioned in the axial direction by the lower surface S2 and the lower end surface of the second sleeve 70 abutting against the installation surface 50a and the abutment surface 54a of the support sleeve 54, respectively.

[0026] A pair of protrusions 72 of the second sleeve 70 are loosely engaged with a pair of recesses 56 of the support sleeve 54. The support bracket 66 is rotated to a position where each protrusion 72 abuts against one side surface 56b of the recess 56, and the abutment positions (stops) the support bracket 66 in the circumferential direction (rotation direction). That is, the one side surface 56b forms a restricting surface that restricts the rotation of the lamp 60. Note that the restricting surface 56b only needs to be able to restrict the rotation of the lamp 60 and needs only to extend in a direction intersecting with the bottom surface 56a. The restricting surface 56b is not limited to a configuration perpendicular to the bottom surface 56a, and may extend in a direction inclined with respect to the bottom surface 56a by an angle of 90 degrees or less or more than 90 degrees. With the support bracket 66 positioned as described above, the fixing screw 80 is screwed into the screw hole 52 through the second sleeve 70 of the support bracket 66, thereby fixing the support bracket 66 to the lamp installation part 50. In this way, the lamp 60 is fixed and positioned at a predetermined position relative to the multiple magnetic disks 18 and the multiple magnetic heads 17. 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 is pressed against the side surfaces 56b of the recess 56. This automatically positions the support bracket 66 in the circumferential direction.

[0027] In the HDD according to the first embodiment configured as described above, the support sleeve 54 of the lamp installation part 50 or the second sleeve of the lamp 60 has both a positioning function and a rotation prevention function for the lamp 60 in the installation part of the lamp 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 it is possible to reduce the processing area of ​​the base. This increases the degree of freedom in the design of the base, and it is possible to reduce costs and improve quality by reducing the processing area. As described above, according to the first embodiment, it is possible to provide a disk device that can easily position and fix the lamp to the housing and reduce the processing area of ​​the housing.

[0028] Next, a lamp installation structure for an HDD according to a modified example and another embodiment will be described. In the modified example and another embodiment described below, the same parts as those in the first embodiment described above are given the same reference numerals, and detailed explanations thereof will be omitted or simplified, and the detailed explanation will be centered on the parts that are different from the first embodiment.

[0029] (First Modification) FIG. 8 is a cross-sectional view of a lamp installation portion and a lamp of an HDD according to a first modified example. As shown in the figure, the second sleeve 70 provided on the support bracket 66 of the lamp 60 is not limited to a metal sleeve, and may be made of, for example, a synthetic resin and molded integrally with the support bracket 66. In this case, an independent second sleeve is not necessary, and the manufacturability and assembly of the lamp 60 are improved.

[0030] (Second Modification) FIG. 9 is a cross-sectional view of a lamp installation portion and a lamp of an HDD according to a second modification. As shown in the figure, the support sleeve 54 provided on the lamp installation portion 50 of the base 12 may be configured as a sleeve separate from the base 12. That is, the support sleeve 54 formed as a separate body may be configured to be fixed to the installation surface 50a of the lamp installation portion 50. The support sleeve 54 can be fixed to the installation surface 50a by welding, adhesive, or the like. When the support sleeve 54 is a separate part, it is possible to further reduce the machining area of ​​the base 12.

[0031] Second embodiment FIG. 10 is an oblique view showing the lamp mounting portion of an HDD according to a second embodiment, FIG. 11 is an oblique view showing the state in which a second sleeve on the lamp side is engaged with the support sleeve of the lamp mounting portion, and FIG. 12 is a cross-sectional view of the lamp mounting portion and lamp of an HDD according to a first modified example.

[0032] 10, according to the second embodiment, the support sleeve 54 installed on the installation surface 50a of the lamp installation part 50 is formed of a separate sleeve and is fixed to the installation surface 50a. The pair of positioning recesses 56 of the support sleeve 54 each have a radial depth smaller than the thickness of the support sleeve 54. As a result, the recesses 56 are open only to the abutment surface 54a and the outer circumferential surface of the support sleeve 54, and the inner circumferential surface side of the support sleeve 54 is closed by a circumferential surface 56c. In detail, 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 a distance from each other 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.

[0033] FIG. 11 shows a state in which only the second sleeve 70 is engaged with the support sleeve 54. As shown in the figure, the second sleeve 70 on the lamp 60 side has an outer diameter and an inner diameter that are approximately equal to the outer diameter and the inner diameter of the support sleeve 54. The second sleeve 70 has a pair of positioning protrusions 72 protruding downward from the lower end surface. The pair of positioning protrusions (only one is shown) 72 are provided at an interval 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 recesses 56 of the support sleeve 54. More specifically, each of the protrusions 72 has a circumferential width smaller than the circumferential width of the recesses 56 and a protruding height shorter than the axial depth of the recesses 56. The protrusions 72 can abut against any of the side surfaces (regulating surfaces) 56b of the recesses 56. In this embodiment, the inner peripheral surface of the protrusion 72 engages with the peripheral surface 56c of the positioning recess 56, contributing to the positioning of the lamp 60 in the planar direction.

[0034] As shown in FIG. 12, in a state where the support bracket 66 is installed on the lamp installation 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 installation surface 50a. The pair of protrusions 72 are located in the corresponding recesses 56 (see FIG. 11). The support bracket 66 engages with the circumferential surface of the support sleeve 54, thereby restricting movement in a planar direction (direction parallel to the installation surface 50a), and positioning the support bracket 66 in the planar direction. In addition, the support bracket 66 is positioned in the axial direction by abutting the lower surface S2 and the lower end surface of the second sleeve 70 against the installation surface 50a and the abutment surface 54a of the support sleeve 54, respectively. Furthermore, the support bracket 66 is rotated to a position where the protrusion 72 abuts against one side surface 56b of the positioning recess 56, and this abutment restricts (stops) the movement of the support bracket 66 in the circumferential direction (rotation direction), thereby positioning the support bracket 66 in the circumferential direction. According to this 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, and also contributing to the positioning in the planar direction. With the support bracket 66 positioned, the above-mentioned fixing screw is screwed into the screw hole 52 through the second sleeve 70 of the support bracket 66, whereby the support bracket 66 is fixed to the lamp installation portion 50. In the second embodiment, other configurations of the HDD are the same as those of the HDD according to the first embodiment described above.

[0035] Third embodiment FIG. 13 is a perspective view showing a lamp installation portion of an HDD according to the third embodiment, and FIG. 14 is a cross-sectional view of the lamp installation portion and the lamp of the HDD according to the third embodiment. 13, according to the third embodiment, the radial depth of each of the pair of positioning recesses 56 of the support sleeve 54 is smaller than the thickness of the support sleeve 54. Each recess 56 is open only on the inner circumferential surface side of the support sleeve 54, and the outer circumferential surface side of the support sleeve 54 is closed by a circumferential surface 56d. Each positioning recess 56 is formed, for example, in a substantially rectangular shape and opens to the inner peripheral 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 peripheral 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.

[0036] 14, the second sleeve 70 of the support bracket 66 has a pair of positioning protrusions 72 (only one is shown). The protrusions 72 have a size and shape that allows them to engage with the pair of recesses 56 of the support sleeve 54. More specifically, 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. The protrusions 72 can abut against either side surface 56b of the recess 56. The support bracket 66 is positioned in the circumferential direction by restricting (preventing) circumferential (rotational) movement (rotation stop) as the protrusion 72 abuts against one side surface 56b of the recess 56. According to this embodiment, the protrusion 72 abuts against the peripheral surface 56d of the recess 56 to restrict the movement of the support bracket 66 in the planar direction, thereby contributing to positioning in the planar direction. In the third embodiment, the other configuration of the HDD is the same as that of the HDD according to the first embodiment described above 041 .

[0037] (Fourth embodiment) FIG. 15 is a perspective view showing a lamp installation portion of an HDD according to the fourth embodiment, and FIG. 16 is a cross-sectional view of the lamp installation portion and the lamp of the HDD according to the fourth embodiment. As shown in FIG. 15, according to the fourth embodiment, the support sleeve 54 has one positioning recess 56. The positioning recess 56 is formed, for example, in a substantially rectangular shape and opens to the inner peripheral surface, the outer peripheral surface, and the abutting surface 54a of the support sleeve 54. Each positioning recess 56 has a pair of side surfaces 56b that extend in the axial direction of the support sleeve 54 and face each other at a distance 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 this embodiment, the recess 56 further has an arc-shaped groove (or slit) 57 formed in the bottom surface 56a. The groove 57 extends in the circumferential direction between the pair of side surfaces 56b.

[0038] As shown in FIG. 16, the second sleeve 70 provided on the support bracket 66 has a positioning protrusion 72 that engages with the positioning recess 56, and further has a protrusion 72a that protrudes from the positioning protrusion 72 in the axial direction. The protrusion 72a is formed in an arc shape that corresponds to the groove 57. The support bracket 66 and the second sleeve 70 are attached to the support sleeve 54 of the lamp installation part 50, the positioning protrusion 72 engages with the positioning recess 56, and further the protrusion 72a is inserted into the groove 57. The inner peripheral surface of the through hole 68 of the support bracket 66 engages with the outer peripheral surface of the support sleeve 54, and further the protrusion 72a engages with the groove 57, restricting the movement of the support bracket 66 and the lamp 60 in the planar direction, and positioning is performed in the planar direction. In addition, the positioning protrusion 72 abuts against the side surface 56b of the positioning recess 56, restricting the rotation of the support bracket 66, and performing circumferential positioning (rotation prevention). In the fourth embodiment, other configurations of the HDD are the same as those of the HDD according to the first embodiment described above.

[0039] The second to fourth embodiments configured as above can also provide the same effects as the first embodiment. Moreover, 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 protrusion or protrusion, it is possible to restrict the movement of the lamp in the planar direction and to position the lamp more stably.

[0040] Although some embodiments and modifications of the present invention have been described, these embodiments and modifications are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and modifications are included in the scope of the invention and its equivalents described in the claims, as well as in the scope and spirit of the invention. For example, the positioning recess of the support sleeve and the positioning protrusion of the second sleeve are not limited to a pair. At least one recess and one protrusion may be provided. Alternatively, the support sleeve may be provided with a positioning protrusion, and the second sleeve may be provided with a positioning recess. The positioning recess and protrusion are not limited to a rectangular shape, and various other shapes may be selected. [Explanation of symbols]

[0041] 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 load mechanism, 50... ramp installation section, 50a... installation surface, 52... screw hole, 54... support sleeve, 56... positioning recess, 57... groove, 60: lamp; 62: lamp body; 66: support bracket; 70: second sleeve; 72…Positioning protrusion

Claims

1. A base having a lamp mounting portion; a magnetic disk rotatably mounted on the base; an actuator that movably supports and drives a head relative to the magnetic disk; a ramp provided at the ramp installation section and configured to hold the head in an unloading position; the lamp mounting portion has an installation surface, a screw hole provided on the installation surface, a cylindrical support sleeve provided on the installation surface and communicating with the screw hole, and a first engagement portion provided on the support sleeve, The lamp has a guide surface that supports the head, an opposing surface that faces the installation surface, an engagement hole that opens into the opposing surface and through which the support sleeve is inserted, and a second engagement portion that engages with the first engagement portion and restricts rotation of the lamp around the support sleeve, and is fixed to the lamp installation portion by a fixing screw that is screwed into the screw hole through the engagement hole. Magnetic disk device.

2. the support sleeve has an annular abutment surface located at a tip end, the first engagement portion has a restriction surface extending in a direction intersecting a circumferential direction of the support sleeve and includes a positioning recess opening into the abutment surface, 2. A magnetic disk device as described in claim 1, wherein the ramp has a second sleeve that is arranged coaxially 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 is capable of abutting against the regulating surface.

3. 3. The magnetic disk drive according to claim 2, wherein the support sleeve is integrally formed with the ramp installation portion.

4. 3. The magnetic disk drive according to claim 2, wherein the support sleeve is formed as a separate part from the base and is fixed to the installation surface.

5. 3. The magnetic disk drive according to claim 2, wherein the second sleeve is made of resin and is integral with the ramp.

6. 3. The magnetic disk drive according to claim 2, wherein the second sleeve is made of metal and is fitted into an engagement hole of the ramp.

7. the positioning recess has a bottom surface positioned substantially parallel to the installation surface, and two side surfaces extending in the axial direction of the support sleeve and facing each other while being spaced apart from each other in the circumferential direction, and opens onto an inner peripheral surface and an outer peripheral surface of the support sleeve; 3. The magnetic disk drive according to claim 2, wherein one of the two side surfaces forms the regulating surface.

8. The positioning recess includes a groove provided on the bottom surface and extending in the circumferential direction, 8. The magnetic disk drive according to claim 7, wherein the positioning protrusion has a projection that engages with the groove.

9. the positioning recess has a bottom surface that opens into the contact surface and the outer circumferential surface of the support sleeve and is positioned approximately parallel to the installation surface, two side surfaces that extend in the axial direction of the support sleeve and are spaced apart from each other and opposed to each other in the circumferential direction, and a circumferential surface that is positioned between the two side surfaces, 3. The magnetic disk drive according to claim 2, wherein the positioning protrusion is located within the positioning recess, abuts against one side surface, and engages with the circumferential surface.

10. the positioning recess has a bottom surface that opens into the contact surface and the inner circumferential surface of the support sleeve and is positioned approximately parallel to the installation surface, two side surfaces that extend in the axial direction of the support sleeve and are spaced apart from each other and opposed to each other in the circumferential direction, and a circumferential surface that is positioned between the two side surfaces, 3. The magnetic disk drive according to claim 2, wherein the positioning protrusion is located within the positioning recess, abuts against one side surface, and engages with the circumferential surface.

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