Ramp mechanism and hard disk drive device

Abstract

To provide a ramp mechanism that can achieve high dimensional accuracy.SOLUTION: A hard disk drive device 1 includes: a recording disk 4 for recording data; a magnetic head 8 for recording or reading data on / from the recording disk 4; a swing arm 7 to which the magnetic head 8 is attached; and a ramp mechanism 9 provided at a position apart from the recording disk 4 and forming a retreating position for the magnetic head 8, wherein the swing arm 7 swings so that the magnetic head 8 moves on the recording disk 4 or the position of the ramp mechanism 9, and the ramp mechanism 9 is made of metal.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a ramp mechanism and a hard disk drive. [Background technology]

[0002] Some hard disk drives employ a ramp load method as a loading method for the magnetic head. The ramp load method is a method in which the magnetic head is retracted to a ramp mechanism provided at a location away from the recording disk when the recording disk is stopped and when the magnetic head is not recording or reading data from the recording disk. Patent Document 1 discloses a ramp structure employed in the ramp load method.

[0003] The ramp mechanism is made of resin alone or a combination of resin and metal parts. As the number of recording disks mounted on a hard disk drive increases, the number of swing arms that swing to move the magnetic head above the recording disk or to the position of the ramp mechanism also increases. As a result, the distance between adjacent swing arms above and below becomes shorter, and the dimensional tolerance required for the ramp structure that forms the retract position for the magnetic head becomes smaller. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2001-23325 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, currently used ramp mechanisms made from resin alone or a combination of resin and metal parts are difficult to machine with precision, and therefore cannot achieve high dimensional accuracy.

[0006] An object of the present invention is to provide a ramp mechanism structure that can achieve high dimensional accuracy. [Means for solving the problem]

[0007] In order to solve the above problems, a metallic ramp mechanism is provided in a hard disk drive. Effect of the Invention

[0008] According to the present invention, the ramp mechanism can be manufactured with high dimensional accuracy. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a hard disk drive 1. [Diagram 2] FIG. 2 is a partial cross-sectional view of the spindle motor 3. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 11 is a partial cross-sectional view of a spindle motor 203 according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. However, the embodiment described below is subject to various technically preferable limitations for carrying out the present invention, but the scope of the present invention is not limited to the following embodiment and illustrated examples.

[0011] Fig. 1 is a perspective view showing the configuration of a hard disk drive 1. Fig. 2 is a partial cross-sectional view showing an example of a spindle motor 3 used in the hard disk drive 1.

[0012] 2 and other figures, the direction parallel to the central axis of shaft 70 (described later) is defined as the axial direction, the direction around the central axis of shaft 70 is defined as the circumferential direction, and the direction perpendicular to the axial direction is defined as the radial direction. For the sake of explanation, the axial direction is defined as the up-down direction, and the rotating part 20 side relative to stationary part 10 is defined as the top, and the stationary part 10 side is defined as the bottom.

[0013] <Hard disk drive> The hard disk drive device 1 includes a housing 2 , a spindle motor 3 , a recording disk 4 , and a bearing device 5 .

[0014] The housing 2 includes a case 6 and a cover (not shown). The case 6 has a box-like shape that is substantially rectangular and has one side open and a bottom. The cover is a plate-like member that covers the open side of the case 6. The cover is fastened to the case 6 using fastening means such as screws. A sealing means (not shown) is provided between the case 6 and the cover, and thus the cover, together with the case 6, forms the housing 2 having a sealed internal space S.

[0015] The internal space S of the housing 2 is filled with air or helium gas, which has a lower density than air. Note that the internal space S may be filled with, for example, nitrogen gas or a mixed gas of helium and nitrogen, in addition to air or helium gas. The internal space S accommodates a spindle motor 3, a recording disk 4, and a bearing device 5.

[0016] The spindle motor 3 rotatably supports a plurality of recording disks 4. The detailed structure of the spindle motor 3 will be described later.

[0017] A plurality of recording disks 4 are provided and supported by the spindle motor 3 so that their disk surfaces face each other. A gap is formed between each of the recording disks 4. In this embodiment, five recording disks 4 are supported by the spindle motor 3.

[0018] The bearing device 5 swingably supports a plurality of swing arms 7 that are disposed in the gaps between the respective recording disks 4 and on the uppermost surfaces of the recording disks 4 .

[0019] The swing arms 7 are supported by the bearing devices 5 in the same number as the recording disks 4. That is, in this embodiment, five swing arms 7 are supported by the bearing devices 5. The swing arms 7 swing in parallel to the surfaces of the recording disks 4 with the bearing devices 5 as the center of rotation. A magnetic head 8 is attached to the tip of the swing arm 7.

[0020] The magnetic head 8 applies magnetism to the recording disk 4 and reads magnetism from the recording disk 4. When the swing arm 7 swings, the magnetic head 8 moves from the ramp mechanism 9 to above the recording disk 4, or from above the recording disk 4 to the ramp mechanism 9. The ramp mechanism 9 is provided at a position away from the recording disk 4. The ramp mechanism 9 is a portion that forms a retreat position for the magnetic head 8. The detailed structure of the ramp mechanism 9 will be described later.

[0021] When the spindle motor 3 rotates, the recording disk 4 also rotates. In this state, when the swing arm 7 swings, the magnetic head 8 moves from the ramp mechanism 9 to above the rotating recording disk 4. Then, the magnetic head 8 applies magnetism to the recording disk 4 and records data on the recording disk 4. The magnetic head 8 also reads magnetism from the recording disk 4 and reads out the data recorded on the recording disk 4. On the other hand, when the magnetic head 8 does not apply magnetism to the recording disk 4 or does not read magnetism from the recording disk 4, the swing arm 7 swings and the magnetic head 8 moves from above the rotating recording disk 4 to the ramp mechanism 9.

[0022] As a recording method for the hard disk drive 1, a thermally assisted magnetic recording (HAMR) method may be adopted.

[0023] <Spindle motor> Next, a detailed configuration of the spindle motor 3 will be described. Fig. 2 is a partial cross-sectional view showing the configuration of the spindle motor 3. The spindle motor 3 includes a stationary part 10 and a rotating part 20 that rotates relative to the stationary part 10 via a bearing mechanism.

[0024] (Stationary part) The stationary portion 10 includes a base plate 30 , a bearing sleeve 40 , a stator core 50 , and a magnetic attraction plate 60 .

[0025] The base plate 30 is a metal member and has a through hole 31, a circumferential groove 32, a circumferential wall 33, and a plate recess 34 formed therein.

[0026] The through hole 31 is a hole for fixing the bearing sleeve 40. The through hole 31 is provided so as to penetrate the base plate 30 in the axial direction. The through hole 31 is cylindrical, and the inner diameter of the cylinder is approximately the same as or larger than the outer diameter of the bearing sleeve 40.

[0027] The circumferential groove portion 32 is formed radially outward of the through hole 31. The circumferential groove portion 32 is an annular groove provided so as to be coaxial with the central axis of the through hole 31 when viewed in the axial direction.

[0028] The circumferential wall portion 33 is formed radially outward of the through hole 31 and inward of the circumferential groove portion 32. The circumferential wall portion 33 is an annular wall provided so as to be coaxial with the central axis of the through hole 31 when viewed in the axial direction, and protrudes upward in the axial direction.

[0029] The plate recess 34 is formed on the radially inner side of the circumferential wall portion 33. The plate recess 34 is a cylindrical space provided so as to be coaxial with the central axis of the through hole 31 when viewed in the axial direction, and opens upward. The diameter of the plate recess 34 is larger than the outer diameter of the through hole 31. The plate recess 34 is connected to the upper side of the through hole 31 in the axial direction.

[0030] The bearing sleeve 40 rotatably supports the shaft 70. The bearing sleeve 40 is a cylindrical iron member made of stainless steel or the like that extends in the axial direction. The bearing sleeve 40 is inserted into the through hole 31 (see FIG. 2). The bearing sleeve 40 is fixed to the through hole 31 with an adhesive that is applied to one or both of the outer circumferential surface of the bearing sleeve 40 and the inner circumferential surface of the through hole 31. The bearing sleeve 40 is provided with radial dynamic pressure generating grooves 41 and thrust dynamic pressure generating grooves 42.

[0031] The radial dynamic pressure generating grooves 41 are provided on the inner circumferential surface 40a of the bearing sleeve 40. In this embodiment, the radial dynamic pressure generating grooves 41 are formed in a continuous row in the circumferential direction on the inner circumferential surface 40a, and are formed in two rows spaced apart in the axial direction.

[0032] The thrust dynamic pressure generating groove 42 is provided in an end face 44 of the axially upper sleeve end 43a of the bearing sleeve 40. The thrust dynamic pressure generating groove 42 is provided in an annular shape so as to be coaxial with the central axis of the bearing sleeve 40 when viewed in the axial direction.

[0033] A large diameter recess 45 and a small diameter recess 46 are formed continuously in the axial direction at the axially lower sleeve end 43b of the bearing sleeve 40. A counter plate 47 is attached to the large diameter recess 45.

[0034] The large diameter recess 45 is formed in the sleeve end portion 43b. The large diameter recess 45 is a cylindrical space provided so as to be coaxial with the central axis of the through hole 31 when viewed in the axial direction. The large diameter recess 45 opens downward.

[0035] The small diameter recess 46 is formed above the large diameter recess 45 at the sleeve end 43b. The small diameter recess 46 is a cylindrical space provided so as to be coaxial with the central axis of the through hole 31 when viewed in the axial direction. The small diameter recess 46 is connected to the large diameter recess 45 in the axial direction. The diameter of the small diameter recess 46 is smaller than the diameter of the large diameter recess 45. By forming the small diameter recess 46 at the sleeve end 43b, the bearing sleeve 40 is formed with an annular surface 48 that is annular when viewed in the axial direction, and an inner peripheral side surface 49 in the circumferential direction.

[0036] The counter plate 47 is a disk-shaped cover that is inserted into the large diameter recess 45 from below the sleeve end 43b. The counter plate 47 covers the large diameter recess 45 and the small diameter recess 46. The counter plate 47 is a member made of iron such as stainless steel. The outer diameter of the counter plate 47 is approximately equal to the inner diameter of the large diameter recess 45. The axial thickness of the counter plate 47 is approximately equal to the depth of the large diameter recess 45.

[0037] When the counter plate 47 is inserted into the large diameter recess 45, the outer edge of the counter plate 47 and the inner edge of the large diameter recess 45 are joined by laser welding. In this way, the counter plate 47 is fixed to the bearing sleeve 40 without any gaps, and closes the large diameter recess 45 and the small diameter recess 46.

[0038] The stator core 50 is a member in which a plurality of annular electromagnetic steel plates are laminated in the axial direction when viewed in the axial direction. The stator core 50 is disposed inside the circumferential groove portion 32 and fixed by a method such as adhesive. The stator core 50 extends radially outward and has a plurality of pole teeth (salient poles) disposed along the circumferential direction. Coils 51 are wound around the pole teeth. The stator core 50 generates magnetic flux when a current flows through the coils 51.

[0039] The magnetic attraction plate 60 is a member that stabilizes the rotation of the rotor hub 80, which will be described later. The magnetic attraction plate 60 is made of, for example, a magnetic material. The magnetic attraction plate 60 generates a magnetic flux in response to a current applied to the coil 51. The magnetic attraction plate 60 is installed radially outward of the stator core 50 in the circumferential groove portion 32.

[0040] (Rotating part) The rotating part 20 has a shaft 70 , a rotor hub 80 , and a rotor magnet 90 .

[0041] The shaft 70 is a member that serves as a rotating shaft of the spindle motor 3. The shaft 70 is rotatably supported inside the bearing sleeve 40. The shaft 70 has a columnar shaft portion 71 and a flange portion 72. In the shaft 70, the shaft portion 71 and the flange portion 72 are integral with each other.

[0042] The shaft portion 71 is a cylindrical shaft member. The shaft portion 71 has a flange portion 72 integrally formed with a lower shaft end portion 73. The shaft portion 71 is disposed inside the bearing sleeve 40 so that the shaft end portion 73 with the flange portion 72 is on the lower side. That is, the outer peripheral surface of the shaft portion 71 is surrounded by the inner peripheral surface 40a of the bearing sleeve 40. The outer peripheral surface of the shaft portion 71 and the inner peripheral surface 40a of the bearing sleeve 40 face each other with a small gap therebetween. Note that the radial dynamic pressure generating grooves 41 may be formed on the outer peripheral surface of the shaft portion 71 instead of the inner peripheral surface 40a of the bearing sleeve 40.

[0043] The flange portion 72 is an annular flange member that expands in the radial direction when viewed in the axial direction. The flange portion 72 is joined to a shaft end portion 73 and is integral with the shaft portion 71. The outer diameter of the flange portion 72 is smaller than the inner diameter of the small diameter recess 46. Thrust dynamic pressure generating grooves 74 are formed on the upper and lower surfaces of the flange portion 72.

[0044] The thrust dynamic pressure generating groove 74 is provided on the upper and lower surfaces of the flange portion 72. The thrust dynamic pressure generating groove 74 is provided in an annular shape so as to be coaxial with the central axis of the flange portion 72 when viewed in the axial direction.

[0045] The flange portion 72 is disposed in the small diameter recess 46 when the shaft 70 is supported by the bearing sleeve 40. The upper surface of the flange portion 72 faces the annular surface 48 formed in the bearing sleeve 40 by the small diameter recess 46 across a small gap. The lower surface of the flange portion 72 faces the upper surface of the counter plate 47 across a small gap. The side surface of the flange portion 72 faces the inner circumferential side surface 49 across a small gap. By disposing the flange portion 72 between the annular surface 48 and the counter plate 47, axial movement of the flange portion 72 and the shaft 70 is prevented.

[0046] Lubricating oil is filled between the shaft 70 and the bearing sleeve 40. Specifically, the lubricating oil is filled between the outer peripheral surface of the shaft portion 71 and the inner peripheral surface 40a of the bearing sleeve 40, between the upper surface of the flange portion 72 and the annular surface 48, between the lower surface of the flange portion 72 and the upper surface of the counter plate 47, and between the side surface of the flange portion 72 and the inner peripheral side surface 49.

[0047] The rotor hub 80 is a member that rotates together with the shaft 70. The rotor hub 80 is attached to the upper end of the shaft 70 and is connected to the shaft 70. The rotor hub 80 has a disk portion 81, a first cylindrical portion 82, a second cylindrical portion 83, and an outer edge portion 84.

[0048] The disk portion 81 is a disk-shaped member that is coaxial with the central axis of the shaft 70 when viewed in the axial direction. The disk portion 81 has a rotor hub through hole 85. The rotor hub through hole 85 is provided at the center of the disk portion 81 when viewed in the axial direction. The disk portion 81 is fixed to the shaft 70. Specifically, the upper end of the shaft 70 is inserted into the rotor hub through hole 85 and fixed by a method such as press fitting or adhesive, thereby fixing the disk portion 81 to the shaft 70. When the shaft 70 is supported by the bearing sleeve 40, the disk portion 81 faces the end face 44 of the bearing sleeve 40 with a small gap therebetween.

[0049] The first cylindrical portion 82 is a cylindrical member having a thickness in the radial direction. The first cylindrical portion 82 is provided so as to be coaxial with the central axis of the rotor hub through hole 85 when viewed in the axial direction, and protrudes axially downward. The inner diameter of the first cylindrical portion 82 is larger than the outer diameter of the bearing sleeve 40. The inner circumferential surface of the first cylindrical portion 82 faces the outer circumferential surface of the bearing sleeve 40 with a gap therebetween. The outer diameter of the first cylindrical portion 82 is smaller than the inner diameter of the circumferential wall portion 33. The outer circumferential surface of the first cylindrical portion 82 faces the inner circumferential surface of the circumferential wall portion 33 with a gap therebetween.

[0050] The second cylindrical portion 83 is a cylindrical member having a thickness in the radial direction. The second cylindrical portion 83 is provided so as to be coaxial with the center axis of the rotor hub through hole 85 when viewed in the axial direction, and protrudes axially downward. The second cylindrical portion 83 is provided on the outer edge of the disk portion 81.

[0051] The outer edge portion 84 is an annular member. The outer edge portion 84 is provided at the lower end of the second cylindrical portion 83. The outer edge portion 84 protrudes radially outward from the second cylindrical portion 83 and is formed in a flange shape. A plurality of recording disks 4 are installed above the outer edge portion 84 and radially outward from the second cylindrical portion 83 (see FIG. 1).

[0052] Lubricating oil is filled between the rotor hub 80 and the bearing sleeve 40. Specifically, the lubricating oil is filled between the lower surface of the disk portion 81 axially inward of the first cylindrical portion 82 and the end surface 44 of the sleeve end 43a on the axially upper side of the bearing sleeve 40.

[0053] The rotor magnet 90 is an annular member having a magnetic pole structure magnetized with polarities inverted as N, S, N, S... along the circumferential direction when viewed in the axial direction. In this embodiment, the rotor magnet 90 is attached to the inner circumferential surface of the second cylindrical portion 83. The rotor magnet 90 is located at approximately the same position as the stator core 50 in the axial direction, and at approximately the same position as the magnetic attraction plate 60 in the radial direction.

[0054] <Spindle motor operation> When the coil 51 is energized, a magnetic attraction force and a magnetic repulsion force are generated between the magnetic poles of the rotor magnet 90 and the pole teeth of the stator core 50. As a result, the rotating part 20 rotates relative to the stationary part 10 with the shaft 70 as the rotation axis.

[0055] The shaft 70 rotates relative to the bearing sleeve 40. At this time, dynamic pressure is generated in the lubricating oil as the lubricating oil is pressurized by the radial dynamic pressure generating grooves 41 and the thrust dynamic pressure generating grooves 74. The generated dynamic pressure supports the shaft 70 in a non-contact state relative to the bearing sleeve 40 in the radial and axial directions.

[0056] As the shaft 70 rotates, the rotor hub 80 rotates relative to the bearing sleeve 40. At this time, the lubricating oil is pressurized by the thrust dynamic pressure generating grooves 42, generating dynamic pressure in the lubricating oil. The generated dynamic pressure supports the rotor hub 80 relative to the bearing sleeve 40 in a non-contact state in the axial direction.

[0057] <Ramp mechanism configuration> Next, a description will be given of the configuration of the ramp mechanism 9. As shown in Fig. 3 and Fig. 4, the ramp mechanism 9 has a main body portion 101 and a rail portion 102. Note that the configuration of the ramp mechanism 9 described below is one example, and is not limited to the configuration described below as long as it has a function of providing a retract position for the magnetic head 8.

[0058] The main body 101 is fixed to the case 6 and is a portion to which the rail portion 102 is attached. The main body 101 has a rectangular portion 101A and a protruding portion 101B. The rectangular portion 101A is a rectangular and plate-shaped member. A plurality of rail portions 102 are provided on one surface (the front surface in FIG. 4) of the rectangular portion 101A. The protruding portion 101B is a portion protruding from the other surface (the back surface in FIG. 4) of the rectangular portion 101A. The upper surface of the protruding portion 101B is continuous with the upper surface of the rectangular portion 101A. The protruding portion 101B is provided with a screw hole 101C. The screw hole 101C penetrates the protruding portion 101B vertically. The screw hole 101C is disposed at the same position as a screw hole (not shown) provided in the case 6 when viewed in the axial direction. The screw hole 101C and the screw hole provided in the case 6 are fastened by a screw. As a result, the main body 101 is fixed to the case 6 .

[0059] The rail portion 102 is a portion that forms a retraction position for the magnetic head 8. A plurality of rail portions 102 are provided on one surface of the main body portion 101 with vertical intervals therebetween, and one end protrudes from the side surface of the rectangular portion 101A as shown in FIG. 4. The number of rail portions 102 is the same as the number of recording disks 4. In this embodiment, five rail portions 102 are provided on the main body portion 101. The rail portions 102 have a notch portion 103, a guide slope portion 104, and a retraction portion 105.

[0060] The cutout portion 103 is a cutout provided at one end of the rail portion 102. As shown in Fig. 4, the outer periphery of the recording disk 4 is disposed in the cutout portion 103. In other words, the outer periphery of the recording disk 4 overlaps with the end of the ramp mechanism 9.

[0061] The guide slope portion 104 is a portion for smoothly guiding the magnetic head 8 to the retraction portion 105. The guide slope portion 104 is provided at one end of the rail portion 102. The guide slope portion 104 is inclined with respect to the disk surface of the recording disk 4. One end of the guide slope portion 104 faces the side where the recording disk 4 is placed, and the other end of the guide slope portion 104 is continuous with the retraction portion 105.

[0062] The retraction portion 105 is a portion of the rail portion 102 that is closer to the other end than the guide slope portion 104. The retraction portion 105 is a retraction position for the magnetic head 8. The retraction portion 105 is continuous with the other end of the guide slope portion 104, and forms a surface that is parallel to the disk surface of the recording disk 4. The shape of the retraction portion 105 may be formed only with a flat surface as in this embodiment, or may have a recess together with an inclined surface in a portion away from the guide slope portion 104.

[0063] Here, the movement of the magnetic head 8 will be described in detail. When the power supply of the hard disk drive 1 is OFF, the magnetic head 8 is located at the retraction portion 105, which is the retraction position. When the power supply of the hard disk drive 1 is ON, the spindle motor 3 rotates, and the recording disk 4 also rotates. In this state, when the magnetic head 8 reads magnetism from the recording disk 4 or applies magnetism to the recording disk 4, the swing arm 7 swings, and the magnetic head 8 moves above the recording disk 4. Specifically, the magnetic head 8 located at the retraction portion 105 moves toward the guide slope portion 104 while contacting the upper surface of the retraction portion 105 in accordance with the swing of the swing arm 7. Then, the magnetic head 8 moves further while contacting the upper surface of the guide slope portion 104, and eventually leaves the guide slope portion 104. Then, the magnetic head 8 moves above the recording disk 4.

[0064] On the other hand, when the magnetic head 8 does not read magnetism from the recording disk 4 or does not apply magnetism to the recording disk 4, the swing arm 7 swings and the magnetic head 8 moves from above the recording disk 4 to the ramp mechanism 9. Specifically, the magnetic head 8 comes into contact with the upper surface of the guide slope portion 104 from one end side thereof as the swing arm 7 swings. Then, the magnetic head 8 moves toward the retraction portion 105 while contacting the upper surface of the guide slope portion 104 (i.e., while being guided by the guide slope portion 104). Then, the magnetic head 8 reaches the upper surface of the retraction portion 105, and stops at the upper surface of the retraction portion 105 when the swing arm 7 stops swinging.

[0065] <Manufacturing method of the ramp mechanism> Next, a method for manufacturing the ramp mechanism 9 will be described. In this embodiment, the ramp mechanism 9 is formed by cutting a metal material such as iron or aluminum. The ramp mechanism 9 may be cut out from one workpiece, or the main body 101 and the rail 102 may be cut out from each workpiece and then assembled to form the ramp mechanism 9. In addition, the material of the ramp mechanism 9 is preferably an iron-based or titanium-based metal when the recording disk 4 is made of glass. Here, the iron-based metal is, for example, SPCC, SPCD, SPCE, SUS303, SUS304, etc., according to the JIS standard. The titanium-based metal is, for example, titanium, titanium alloys such as α-type titanium and β-type titanium, etc. In addition, the material of the ramp mechanism 9 is preferably an aluminum-based metal when the recording disk 4 is made of an aluminum-based metal. Here, the aluminum-based metal is, for example, ADC10, ADC12, etc., according to the JIS standard.

[0066] Next, electrodeposition coating is performed on the lamp mechanism 9. Electrodeposition coating is a process in which a member to be coated is immersed in a tank filled with paint, and an electric current is passed through the paint to adhere to the surface of the member to be coated, followed by drying and thermal curing. When electrodeposition coating is performed on the lamp mechanism 9, it is preferable to use a coating material that contains a benzene ring-containing epoxy resin and a pigment containing an aluminum silicate component as the coating material. Note that a coating material containing an epoxy-polyamide resin may be used as the coating material.

[0067] Next, the process of electrodeposition coating will be described. First, the ramp mechanism 9 is immersed in a tank filled with paint and electricity is applied. Then, when the ramp mechanism 9 is pulled out of the tank, the paint adheres to the surface of the ramp mechanism 9.

[0068] Next, the lamp mechanism 9 with the paint attached to its surface is heated to heat and harden the paint. Normally, the lamp mechanism 9 with the paint attached to its surface is heated at a temperature of about 200°C to 220°C for about 10 to 60 minutes, but in this embodiment, it is heated at a temperature of 280°C for about 10 to 60 minutes. The heating temperature is preferably 250°C or higher because the heating time can be shortened. In this way, when heat-hardening the paint, setting the heating temperature high without changing the heating time, or setting the heating time long without changing the heating temperature to promote the heat hardening of the paint more than usual, is called overbaking. In other words, a coating film 106, which is an overbaked epoxy resin-containing electrodeposition coating film, is formed on the surface of the lamp mechanism 9.

[0069] Here, overbaking will be explained. Overbaking is a method of baking a coating material by supplying energy higher than the energy required to bring the crosslinks (bonds) existing between the molecules that make up the coating film to the desired state (i.e., curing). Overbaking is caused by excessive heating time, excessive heating temperature, or both excessive heating time and excessive heating temperature.

[0070] Overbaking a coating film containing a resin or the like may result in more crosslinks being formed than with regular baking. Overbaking forms more crosslinks and reduces the number of sites where crosslinks can be formed, which is thought to result in suppressed incorporation of oxygen atoms that contribute to crosslink formation in the overbaked coating film containing a resin or the like. In addition, the formation of crosslinks by overbaking is thought to lead to an increase in the hardness of the overbaked coating film containing a resin or the like.

[0071] <Effects> The ramp mechanism 9 provided in the hard disk drive 1 according to this embodiment is made of metal.

[0072] Conventional ramp mechanisms are manufactured using resin materials alone or a combination of resin materials and metal materials. Since resin materials have larger dimensional tolerances in cutting processes than metal materials, it is difficult to manufacture conventional ramp mechanisms with high precision.

[0073] On the other hand, the ramp mechanism 9 of the present embodiment is manufactured by precision machining with a dimensional tolerance of about ±0.001 mm. Therefore, the ramp mechanism can be manufactured with higher dimensional accuracy than the conventional ramp mechanism.

[0074] Moreover, the ramp mechanism 9 according to this embodiment includes a rail portion 102 that forms a retract position for the magnetic head 8 provided in the hard disk drive 1, and the rail portion 102 is made of metal.

[0075] Since the rail portion 102 that forms the retraction position of the magnetic head 8 is made of metal, the rail portion 102 can be manufactured with high dimensional precision.

[0076] Moreover, the surface of the ramp mechanism 9 according to this embodiment is covered with a coating film 106 formed by electro-deposition coating.

[0077] Since the surface of the ramp mechanism 9 is covered with the coating film 106, the magnetic head 8 and the ramp mechanism 9 can be insulated from each other.

[0078] Furthermore, the magnetic head 8 slides relative to the guide slope portion 104 and the retracted portion 105. However, the surfaces of the guide slope portion 104 and the retracted portion 105 are covered with the coating film 106 and are therefore not easily damaged.

[0079] Moreover, the coating film 106 is an overbaked epoxy resin-containing electrodeposition coating film.

[0080] Since the coating film 106 is an overbaked epoxy resin-containing electrodeposition coating film, the surface of the ramp mechanism 9 is covered with a coating film that is harder than a coating film that is not overbaked. Therefore, the surface of the ramp mechanism 9 is more resistant to scratches.

[0081] The hard disk drive device 1 also includes a recording disk 4 for recording data, a magnetic head 8 for recording or reading data on the recording disk 4, a swing arm 7 to which the magnetic head 8 is attached, and a ramp mechanism 9 that is provided at a position away from the recording disk 4 and serves as a retreat position for the magnetic head 8, and the swing arm 7 swings so that the magnetic head 8 moves above the recording disk 4 or to the position of the ramp mechanism 9.

[0082] As the number of recording disks mounted on a hard disk drive increases, the distance between adjacent swing arms in the vertical direction becomes shorter, and high dimensional accuracy is also required for the ramp mechanism that forms the retract position for the magnetic head attached to the swing arm. The hard disk drive 1 according to this embodiment is provided with a ramp mechanism 9 manufactured with high dimensional accuracy, so that the number of recording disks 4 mounted on the hard disk drive 1 can be increased.

[0083] Furthermore, because the ramp mechanism 9 is made of metal, its coefficient of thermal expansion is approximately the same as or close to that of the base plate 30, which is also made of metal. As a result, the amount of misalignment between the magnetic head 8 and the ramp mechanism 9 caused by heat is reduced.

[0084] In addition, in the hard disk drive 1, the recording disk 4 is made of glass, and the ramp mechanism 9 is made of an iron-based or titanium-based metal.

[0085] If the recording disk 4 is made of glass and the ramp mechanism 9 is made of an iron-based or titanium-based metal, the thermal expansion coefficients of the recording disk 4 and the ramp mechanism 9 will be close to each other. As a result, the amount of misalignment between the magnetic head 8 and the ramp mechanism 9 caused by heat will be further reduced.

[0086] In the hard disk drive 1, the recording disk 4 is made of an aluminum-based metal, and the ramp mechanism 9 is also made of an aluminum-based metal.

[0087] If the recording disk 4 is made of aluminum and the ramp mechanism 9 is made of an aluminum-based metal, the recording disk 4 and the ramp mechanism 9 will have approximately the same thermal expansion coefficient. As a result, the amount of misalignment between the magnetic head 8 and the ramp mechanism 9 caused by heat is further reduced.

[0088] The magnetic recording method used in the hard disk drive 1 is a thermally assisted magnetic recording method.

[0089] In hard disk drives that use the thermally assisted magnetic recording (HAMR) method, the temperature at the tip of the magnetic head can reach as high as 400° C. In such hard disk drives, it is known that it is useful to have oxygen present within the hard disk drive in order to decompose organic impurities that may be a cause of read / write errors.

[0090] The present inventors have investigated the possibility that in a high-temperature environment of 400°C, not only are organic impurities decomposed, but other organic compounds present in the hard disk drive are oxidized and consume oxygen, resulting in insufficient decomposition of organic impurities by oxygen. Therefore, the present inventors have focused on the coating (coating) of the ramp mechanism as one candidate for other organic compounds that consume oxygen, and have reconsidered the structure of the coating based on the idea that the coating of the ramp mechanism does not consume oxygen (prevention of oxygen intake). As a mode of chemically changing the structure of the coating, the present inventors have come to the conclusion that the mode of an overbaked electrodeposition coating film may be able to realize this idea.

[0091] According to the above hard disk drive 1, a thermally assisted magnetic recording method is adopted as the magnetic recording method, and the ramp mechanism 9 is made of metal. Therefore, the ramp mechanism 9 does not take in oxygen remaining inside the hard disk drive 1. As a result, oxygen tends to remain inside the hard disk drive 1, and organic impurities remaining inside the hard disk drive 1 are easily decomposed by oxygen.

[0092] Furthermore, when the surface of the ramp mechanism 9 is covered with the coating film 106, which is an overbaked epoxy resin-containing electrodeposition coating film, the amount of oxygen atoms taken in by the coating film 106 is suppressed. As a result, oxygen tends to remain inside the hard disk drive 1, and organic impurities remaining inside the hard disk drive 1 tend to be decomposed by oxygen.

[0093] <Modification> The hard disk drive 1 may be a combination of the modifications described below.

[0094] (1) Variation 1 The hard disk drive 1 may include a spindle motor 203 as shown in Fig. 5, instead of the spindle motor 3 described in the above embodiment. The spindle motor 203 includes a stationary part 210 and a rotating part 220 that rotates relative to the stationary part 210 via a bearing mechanism.

[0095] (2) Variation 2 The hard disk drive 1 described in the above embodiment records data on one upper side of the recording disk 4, but may record data on both sides (i.e., both the upper and lower sides) of the recording disk 4. In this case, the number of swing arms 7 and magnetic heads 8 is twice that of the recording disks 4. The guide slope portions 104 are provided above and below one end of the rail portion 102.

[0096] (3) Variation 3 In the above embodiment, the surface of the ramp mechanism 9 is covered with the coating film 106, which is an overbaked epoxy resin-containing electrodeposition coating film. However, the surface of the ramp mechanism 9 may be covered with a normal electrodeposition coating film that is not overbaked. Also, the surface of the ramp mechanism 9 does not have to be covered with an electrodeposition coating film. [Explanation of symbols]

[0097] 1...hard disk drive, 3,203...spindle motor, 4...recording disk, 7...swing arm, 8...magnetic head, 9...ramp mechanism, 102...rail portion, 106...coating film

Claims

1. A metal ramp mechanism installed in a hard disk drive.

2. the ramp mechanism includes a rail portion that defines a retreat position for a magnetic head provided in the hard disk drive; The rail portion is made of metal.

2. The ramp arrangement of claim 1.

3. The surface of the ramp mechanism is covered with a coating film formed by electrocoating.

2. The ramp arrangement of claim 1.

4. The coating film is an overbaked epoxy resin-containing electrodeposition coating film.

4. The ramp arrangement of claim 3.

5. a recording disk for recording data; a magnetic head for recording or reading the data on the recording disk; a swing arm to which the magnetic head is attached; a ramp mechanism provided at a position away from the recording disk and forming a retreat position for the magnetic head; Equipped with the swing arm swings so that the magnetic head moves to above the recording disk or to the retracted position, The ramp mechanism is a ramp mechanism according to any one of claims 1 to 4. Hard disk drive.

6. the recording disk is made of glass; The ramp mechanism is made of a metal such as an iron or titanium metal.

6. The hard disk drive according to claim 5.

7. the recording disk is made of an aluminum-based metal, The ramp mechanism is made of an aluminum-based metal.

6. The hard disk drive according to claim 5.

8. The magnetic recording method of the hard disk drive is a thermally assisted magnetic recording method.

6. The hard disk drive according to claim 5.

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