Disk device

Abstract

To provide a disk device capable of improving reliability by suppressing a failure caused by outgas.SOLUTION: According to an embodiment, a disk device includes a disk-like recording medium, an actuator assembly rotatably provided, a magnetic head supported by the actuator assembly, and a first stopper and a second stopper disposed so as to be able to abut on the actuator assembly. At least one of the first stopper and the second stopper includes a buffer member having an abutting surface capable of abutting on the actuator assembly, and a gas adsorbent provided to surround the buffer member except for the abutting surface.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] A disk device such as a hard disk drive (HDD) includes a rotatable magnetic disk mounted in a housing and a rotatable actuator assembly (sometimes called a head suspension assembly (HSA)) that supports a magnetic head. The housing is provided with inner and outer stoppers that limit the range of movement of the actuator assembly. In order to reduce the impact when the actuator assembly collides with the stopper, each of the inner stopper and the outer stopper has a shock absorbing member such as elastic rubber or elastomer.

[0003] On the other hand, rubber and elastomers used as buffer materials can generate outgassing, which can diffuse into the HDD over a long period of time and accumulate on the magnetic head and magnetic disk, potentially causing problems with the HDD's operation. As a countermeasure against outgassing, a filter containing a gas adsorbent such as activated carbon is installed inside the housing. Typically, the filter is installed away from the stopper. Therefore, it is difficult for the filter to adequately capture the outgassing generated from the stopper. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-48537 [Patent Document 2] U.S. Patent No. 4,777,549 [Patent Document 3] Japanese Patent Application Laid-Open No. 2001-035131 [Patent Document 4] U.S. Patent No. 7,133,249 [Patent Document 5] U.S. Patent No. 7,564,647 [Patent Document 6] Japanese Patent Application Laid-Open No. 2010-238344 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the embodiments of the present invention is to provide a disk device that can suppress failures caused by outgassing and improve reliability. [Means for solving the problem]

[0006] According to an embodiment, a disk drive includes a disk-shaped recording medium, a rotatable actuator assembly, a magnetic head supported by the actuator assembly, and first and second stoppers arranged to be able to abut against the actuator assembly. At least one of the first and second stoppers includes a buffer member having an abutment surface that can abut against the actuator assembly, and a gas adsorbent surrounding the buffer member except for the abutment surface. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is an exploded perspective view of a hard disk drive (HDD) according to a first embodiment, showing the top cover exploded. [Figure 2] FIG. 2 is a plan view of the HDD. [Figure 3] FIG. 3 is a perspective view showing a head actuator assembly and an FPC unit of the HDD. [Figure 4] FIG. 4 is a perspective view of the HDD with the head actuator assembly, FPC unit, and upper yoke removed. [Figure 5] FIG. 5 is a cross-sectional view of the HDD showing an inner stopper portion. [Figure 6] FIG. 6 is a perspective view of the inner stopper. [Figure 7] FIG. 7 is a perspective view showing a suction unit of the inner stopper with a part cut away. [Figure 8] FIG. 8 is a perspective view of the outer stopper. [Figure 9] FIG. 9 is a perspective view showing a suction unit of the outer stopper with a part cut away. [Figure 10] FIG. 10 is a cross-sectional view of the outer stopper. [Figure 11] FIG. 11 is a perspective view showing an inner stopper of an HDD according to a second embodiment. [Figure 12] FIG. 12 is a perspective view showing a buffer member and a suction unit of the inner stopper, with a part cut away. [Figure 13] FIG. 13 is a perspective view and a cross-sectional view of an outer stopper according to the second embodiment. [Figure 14] FIG. 14 is a perspective view showing an inner stopper of an HDD according to a third embodiment. [Figure 15] FIG. 15 is a perspective view showing an inner stopper of an HDD according to a fourth embodiment. [Figure 16] FIG. 16 is a perspective view showing outer stoppers according to the fifth and sixth embodiments. [Figure 17] FIG. 17 is a cross-sectional view of an HDD according to a seventh embodiment, showing an inner stopper portion of the HDD. [Figure 18] FIG. 18 is a perspective view of an inner stopper according to a seventh embodiment. [Figure 19] FIG. 19 is a cross-sectional view of an HDD according to a seventh embodiment, showing an outer stopper portion of the HDD. [Figure 20] FIG. 20 is a perspective view of an outer stopper according to the seventh embodiment. [Figure 21] FIG. 21 is a cross-sectional view of an HDD according to an eighth embodiment, showing an inner stopper portion of the HDD. [Figure 22] FIG. 22 is a perspective view of an inner stopper according to an eighth embodiment. [Figure 23]FIG. 23 is a cross-sectional view of an HDD according to an eighth embodiment, showing an outer stopper portion of the HDD. [Figure 24] FIG. 24 is a perspective view of an outer stopper according to an eighth embodiment. [Figure 25] FIG. 25 is a cross-sectional view of an HDD according to a ninth embodiment, showing an inner stopper portion of the HDD. [Figure 26] FIG. 26 is a perspective view of an inner stopper according to a ninth embodiment. [Figure 27] FIG. 27 is a perspective view showing an inner stopper of an HDD according to a tenth embodiment. [Figure 28] FIG. 28 is a cross-sectional view of an HDD according to a ninth embodiment, showing an outer stopper portion of the HDD. [Figure 29] FIG. 29 is a perspective view of an outer stopper according to a ninth embodiment. [Figure 30] FIG. 30 is a perspective view showing an outer stopper of an HDD according to a tenth embodiment. [Figure 31] FIG. 31 is a table showing other combination examples of Examples 11-26. DETAILED DESCRIPTION OF THE INVENTION

[0008] A 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 easily conceivable by those skilled in the art while maintaining the gist of the invention are naturally included within the scope of the present invention. Furthermore, the drawings may be schematic in size, shape, etc., of each part compared to the actual embodiment for clarity of explanation, but these are merely examples and do not limit the interpretation of the present invention. Furthermore, in this specification and each drawing, elements similar to those previously described with reference to the previous drawings may be designated by the same reference numerals, and detailed descriptions may be omitted as appropriate.

[0009] (First embodiment) A hard disk drive (HDD) according to a first embodiment will be described in detail as a disk device. Fig. 1 is an exploded perspective view of the HDD according to the first embodiment with the cover disassembled, and Fig. 2 is a plan view of the HDD with the cover removed. As shown in FIG. 1, the HDD includes a substantially rectangular housing 10. The housing 10 has a rectangular box-shaped base 12 with an open top, and a cover (top cover) 14 that is fastened to the base 12 with a plurality of screws 13 and closes the top opening of the base 12. The base 12 has a rectangular bottom wall 12a that faces the cover 14 with a gap therebetween, and side walls 12b that extend along the periphery of the bottom wall 12a. The base 12 is integrally molded from, for example, an aluminum alloy. The side walls 12b include a pair of long side walls facing each other and a pair of short side walls facing each other. The cover 14 is formed into a rectangular plate shape from, for example, stainless steel. The periphery of the cover 14 is fastened to the top surfaces of the side walls 12b with the screws 13.

[0010] The housing 10 contains a plurality of magnetic disks 18 (e.g., ten) 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 is formed in a disk shape, e.g., 96 mm (3.5 inches) in diameter, and includes a substrate made of a non-magnetic material, such as glass or aluminum, and magnetic recording layers formed on the upper surface (first surface) and lower surface (second surface) of the substrate. In one example, an aluminum substrate is used. Each magnetic disk 18 is coaxially fitted to the hub of the spindle motor 19 and further clamped by a clamp spring 20. This supports the magnetic disks 18 in a state parallel to the bottom wall 12a of the base 12. The plurality of magnetic disks 18 are rotated at a predetermined rotation speed by the spindle motor 19. The number of magnetic disks 18 mounted is not limited to ten, and may be nine or fewer, or eleven or more.

[0011] 1 and 2, housing 10 contains a plurality of magnetic heads 17 that record and reproduce information on magnetic disks 18, and an actuator assembly (sometimes referred to as a head suspension assembly (HSA)) 22 that supports these magnetic heads 17 so that they can move freely relative to magnetic disks 18. Also provided within housing 10 are a voice coil motor (VCM) 24 that rotates and positions actuator assembly 22, a ramp load mechanism 25 that holds magnetic heads 17 in an unload position spaced apart from magnetic disks 18 when they move to the outermost periphery of magnetic disks 18, a board unit (FPC unit) 21 on which electronic components such as a conversion connector are mounted, and a spoiler 70. The actuator assembly 22 and VCM 24 constitute a head actuator. A printed circuit board 27 is screwed to the outer surface of the bottom wall 12a of the base 12. The printed circuit board 27 controls the operation of the spindle motor 19 and also constitutes a control unit that controls the operation of the VCM 24 and the magnetic head 17 via the board unit 21.

[0012] 3 is a perspective view showing the actuator assembly and the board unit. As shown in the figure, the actuator assembly 22 includes an actuator block 29 having a through-hole 26, a bearing unit (unit bearing) 28 provided in the through-hole 26, a plurality of (e.g., eleven) arms 32 extending from the actuator block 29, a suspension assembly (sometimes referred to as a head gimbal assembly: HGA) 30 attached to each arm 32, and a magnetic head 17 supported by the suspension assembly 30. A support shaft (pivot) 31 stands on the bottom wall 12a of the base 12. The actuator block 29 is supported by the bearing unit 28 so as to be rotatable around the support shaft 31.

[0013] In this embodiment, the actuator block 29 and the eleven arms 32 are integrally formed from aluminum or the like to form a so-called E-block. The arms 32 are formed, for example, in the shape of a long, thin plate, and extend from the actuator block 29 in a direction perpendicular to the support shaft 31. The eleven arms 32 are arranged parallel to each other with gaps between them. The actuator assembly 22 has a support frame 33 extending from the actuator block 29 in the opposite direction to the arm 32, and this support frame 33 supports a voice coil 39 that constitutes a part of the VCM 24. The support frame 33 has a first contact portion 33a that can come into contact with an inner stopper (described later) and a second contact portion 33b that can come into contact with an outer stopper (described later). As shown in Fig. 2, the voice coil 39 is located between a pair of yokes 37a, 37b, one of which is fixed on the base 12, and constitutes the VCM 24 together with these yokes 37a, 37b and a magnet fixed to one of the yokes.

[0014] 3, the actuator assembly 22 has 20 suspension assemblies 30, each supporting a magnetic head 17. The suspension assemblies 30 are attached to the extending end 32a of each arm 32. The multiple suspension assemblies 30 include up-head suspension assemblies that support the magnetic heads 17 facing upward, and down-head suspension assemblies that support the magnetic heads 17 facing downward. These up-head suspension assemblies and down-head suspension assemblies are constructed by arranging suspension assemblies 30 of the same structure facing upside down. 3, in this embodiment, the down head suspension assembly 30 is attached to the uppermost arm 32, and the up head suspension assembly 30 is attached to the lowermost arm 32. An up head suspension assembly 30 and a down head suspension assembly 30 are attached to each of the nine intermediate arms 32.

[0015] The suspension assembly 30 includes a substantially rectangular base plate 38, a load beam 42 made of a long, thin leaf spring, and a long, thin, strip-shaped flexure (wiring member) 40. The flexure 40 has a freely displaceable gimbal portion on which the magnetic head 17 is mounted. The base end of the base plate 38 is fixed to the extending end 32a of the arm 32, for example, by crimping. The base end of the load beam 42 is fixed to and overlaps the end of the base plate 38. The load beam 42 extends from the base plate 38 and tapers toward the extending end. The base plate 38 and the load beam 42 are made of, for example, stainless steel. The load beam 42 generates a spring force (reaction force) that urges the magnetic head 17 toward the surface of the magnetic disk 18. A tab 46 protrudes from the tip of the load beam 42. The tab 46 can engage with a ramp 74, which will be described later, and together with the ramp 74, constitutes a ramp load mechanism 25.

[0016] 3, the FPC unit 21 integrally includes a substantially rectangular base portion 21a bent into an L-shape, a narrow strip-shaped relay portion 21b extending from one side edge of the base portion 21a, and a joint portion 21c provided continuously with 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 flexible printed circuit board has an insulating layer such as polyimide, a conductive layer formed on the insulating layer and having a plurality of wirings, connection pads, etc., and a protective layer covering the conductive layer.

[0017] Electronic components such as a conversion connector (not shown) and multiple capacitors are mounted on the base portion 21a and electrically connected to wiring (not shown). A metal plate that functions as a reinforcing plate is affixed to the base portion 21a. The base portion 21a is installed on the bottom wall 12a of the base 12. The relay portion 21b extends from the side edge of the base portion 21a toward the actuator block 29 of the actuator assembly 22. The joint portion 21c provided at the extending end of the relay portion 21b is formed in a rectangular shape with a height and width approximately equal to the side surface (mounting surface) of the actuator block 29. The joint portion 21c is affixed to the mounting surface of the actuator block 29 via a backing plate made of aluminum or the like and further fixed to the mounting surface with fixing screws 72. A number of connection pads are provided on the joint portion 21c. For example, one head IC (head amplifier) ​​67 is mounted on the joint portion 21c, and this head IC 67 is connected to the connection pads and the base portion 21a via wiring. Furthermore, a connection terminal 68 to which the voice coil 39 is connected is provided at the joint 21c.

[0018] The flexure 40 of each suspension assembly 30 has one end electrically connected to the magnetic head 17, the other end extending to the actuator block 29 through a groove formed in the side edge of the arm 32, and a connection end (tail connection terminal portion) 48c provided at the other end. The connection end 48c is formed in an elongated rectangular shape. The connection end 48c is provided with a plurality of connection terminals (connection pads) 51, for example, thirteen connection terminals 51. These connection terminals 51 are respectively connected to the wiring of the flexure 40. That is, the plurality of wirings of the flexure 40 extend over substantially the entire length of the flexure 40, one end is electrically connected to the magnetic head 17, and the other end is connected to the connection terminals (connection pads) 51. The connection terminals 51 provided on the connection end 48c are joined to the connection pads of the joint 21c and are electrically connected to the wiring of the joint 21c via the connection pads. As a result, the 20 magnetic heads 17 of the actuator assembly 22 are electrically connected to the base portion 21a through the wiring of the flexure 40, the connection end 48c, the joint 21c of the FPC unit 21, and the relay portion 21b.

[0019] 1 and 2, when the actuator assembly 22 is installed in the base 12, the support shaft 31 stands upright and is approximately parallel to the spindle of the spindle motor 19. The actuator assembly 22 is rotatably supported around the support shaft 31 and can rotate between an unload position (position shown by a solid line in FIG. 2) where the magnetic head 17 is unloaded outside the outermost periphery of the magnetic disk 18 and an inner peripheral position (position shown by a two-dot chain line in FIG. 2) where the magnetic head 17 is located on the innermost periphery of the magnetic disk 18. Each magnetic disk 18 is positioned between two suspension assemblies 30. When the HDD is in operation, the magnetic head 17 supported by the two suspension assemblies 30 faces the upper and lower surfaces of the magnetic disk 18, respectively.

[0020] The ramp load mechanism 25 includes a ramp 74. As shown in FIG. 1, the ramp 74 is fixed to the base 12 and is located near the periphery of the magnetic disk 18. When the HDD is not in operation, when the magnetic head 17 moves away from the outer periphery of the magnetic disk 18 and moves to a predetermined unload position, the tab 46 of the suspension assembly 30 climbs onto the ramp 74. This keeps the magnetic head 17 at the unload position away from the magnetic disk 18.

[0021] FIG. 4 is a perspective view of the HDD with the actuator assembly, FPC unit, and upper yoke 37b removed. As shown in the figure, of the pair of yokes that make up the VCM, the lower yoke 37a is disposed on and fixed to the bottom wall 12a of the base 12. The lower yoke 37a is, for example, a substantially L-shaped flat plate and is disposed along a corner of the bottom wall 12a. Support sleeves 38a and 38b are erected at one end and the other end of the lower yoke 37a. As shown in FIGS. 1 and 2, the upper yoke 37b has a flat plate having substantially the same shape as the lower yoke 37a and a pair of legs extending from both ends of the flat plate. The upper yoke 37b is disposed overlapping the lower yoke 37a. Furthermore, the upper yoke 37b is fixed to the lower yoke 37a and the bottom wall 12a by two fixing screws 40a, 40b that are screwed into the bottom wall 12a through the cover 14, the upper yoke 37b, the support sleeves 38a, 38b, and the lower yoke 37a, respectively. The upper yoke 37b faces the lower part 37a with a gap therebetween. In one example, permanent magnets M (see FIG. 5) are installed on the upper surface of the lower yoke 37a and the lower surface of the upper yoke 37b.

[0022] 4, the HDD 10 includes an inner stopper (first stopper) 50 and an outer stopper (second stopper) 60 that define the movement range (rotation range) of the actuator assembly 22. In one example, the inner stopper 50 is erected on the lower yoke 37a near the support sleeve 38a. In another example, the outer stopper 60 is erected on the bottom wall 12a near the support sleeve 38b.

[0023] 2, when the magnetic head 17 moves toward the innermost periphery of the magnetic disk 18, the first contact portion 33a of the support frame 33 of the actuator assembly 22 comes into contact with the inner stopper 50, limiting the range of movement of the magnetic head 17 toward the inner periphery. Furthermore, when the magnetic head 17 moves from the magnetic disk 18 onto the on-load position to a parking area (unload position) on the ramp 74, the second contact portion 33b of the support frame 33 comes into contact with the outer stopper 60, limiting the range of movement of the magnetic head 17 toward the outer periphery. This prevents the magnetic head 17 from falling off the ramp 74. Thus, the range of movement (rotation range) of the actuator assembly 22 is defined by the inner stopper 50 and the outer stopper 60.

[0024] The inner stopper 50 and the outer stopper 60 will be described in detail below. 5 is a cross-sectional view of the HDD showing the inner stopper portion, FIG. 6 is a perspective view of the inner stopper, and FIG. 7 is a perspective view showing a suction unit of the inner stopper with a part cut away. As shown in Figures 5 and 6, the inner stopper 50 includes a stopper pin 51 erected between the lower yoke 37a and the upper yoke 3b, a buffer member 52 attached to the stopper pin 51, and an adsorption unit 54 provided around the buffer member 52.

[0025] The stopper pin 51 has one end engaged with a through hole in the lower yoke 37a and the other end engaged with a through hole in the upper yoke 37b, and is provided substantially perpendicular to the lower yoke 37a. The buffer member 52 is formed in a cylindrical shape, for example. The buffer member 52 is attached to the stopper pin 51 with its inner peripheral surface in close contact with the peripheral surface of the stopper pin 51. A portion of the outer peripheral surface of the buffer member 52 forms a first abutment surface S1 against which the first abutment portion 33a of the actuator assembly 22 abuts. The buffer member 52 is formed of an elastic buffer material, for example, rubber, elastomer, or the like.

[0026] As shown in FIGS. 6 and 7 , the adsorption unit 54 includes a gas adsorbent (hereinafter referred to as the adsorbent) 55 that adsorbs outgassing and an outer case 56 that covers most of the adsorbent 55. Examples of the adsorbent 55 include carbon-based adsorbents such as activated carbon, synthetic adsorbents, and silica gel. In one example, the adsorbent 55 is made of granular or powdered activated carbon molded into a desired shape. In this embodiment, the adsorbent 55 is molded into an arc-shaped or C-ring-shaped configuration with a desired thickness and width. The adsorbent 55 has an arc-shaped inner circumferential surface serving as an adsorption surface 55a, an arc-shaped outer circumferential surface, arc-shaped upper and lower surfaces, and a pair of end surfaces connected to the upper and lower surfaces. The adsorption surface 55a has a diameter and width (axial width) corresponding to the outer circumferential surface of the buffer member 52.

[0027] The outer case 56 is formed of, for example, a metal plate such as an aluminum alloy or stainless steel, or a resin such as polycarbonate, and has an arc shape or a C-ring shape. The inner peripheral side of the outer case 56, i.e., the stopper side, is open. The adsorbent 55 is housed or sealed within the outer case 56. The outer surfaces (outer peripheral surface, upper surface, lower surface, and end surfaces) of the adsorbent 55 except for the adsorbing surface 55a are covered by the outer case 56. In other words, only the adsorbing surface 55a is exposed to the outside of the outer case 56.

[0028] 5 and 6, the suction unit 54 is coaxially attached to the buffer member 52 with the inner peripheral edge of the outer case 56 fitted to the outer peripheral surface of the buffer member 52. The suction unit 54 covers the outer peripheral surface of the buffer member 52 except for the first contact surface S1. The suction surface 55a of the adsorbent 55 contacts the outer peripheral surface of the buffer member 52 except for the first contact surface S1. As described above, the outer surface of the adsorbent 55 other than the suction surface 55a is covered by the outer case 56. Note that the suction surface 55a is not limited to being in contact with the outer peripheral surface of the buffer member 52, and may be adjacent to and facing the outer peripheral surface with a small gap therebetween.

[0029] According to the inner stopper 50 configured as described above, the outgas can be directly adsorbed by the adsorbent 55 from the surface of the buffer member 52, which is the source of outgassing. This makes it possible to significantly reduce the amount of outgas that diffuses into the housing. Furthermore, according to this embodiment, the outer surface of the adsorbent 55 is covered with the outer case 56, thereby achieving the effect of suppressing the diffusion of contamination generated from the adsorbent 55. The shapes of the adsorbent 55 and the outer case 56 are not limited to an arc shape, and various shapes can be applied. The adsorbent 55 only needs to have an adsorption surface 55a that covers the outer surface of the buffer member 52, and the shape of the other parts of the adsorbent 55 can be selected arbitrarily. Similarly, the outer case 56 only needs to have a shape that covers the outer surface of the adsorbent 55 excluding the adsorption surface 55a. Furthermore, the adsorption unit 54 is not limited to being attached to the buffer member 52, and may be attached to the lower yoke 37a or the upper yoke 37b via a support member.

[0030] 8 is a perspective view of the outer stopper, FIG. 9 is a perspective view showing a suction unit of the outer stopper with a part cut away, and FIG. 10 is a vertical cross-sectional view of the outer stopper. As shown in FIGS. 8 and 10, the outer stopper 60 includes a stopper pin 61, a buffer member 62 attached to the stopper pin 61, and a suction unit 64 provided around the buffer member 62.

[0031] The stopper pin 61 has one end engaged in a through hole in the bottom wall 12a and the other end engaged in the cover 14, and is provided substantially perpendicular to the bottom wall 12a. In one example, the buffer member 62 is formed in a cylindrical shape. The buffer member 62 is attached to the stopper pin 61 with its inner circumferential surface in close contact with the circumferential surface of the stopper pin 61. A portion of the outer circumferential surface of the buffer member 62 forms the second abutment surface S2 with which the second abutment portion 33b of the actuator assembly 22 abuts. The buffer member 62 is formed of an elastic buffer material such as rubber or elastomer.

[0032] As shown in FIGS. 8, 9, and 10, the adsorption unit 64 includes an adsorbent 65 that adsorbs outgassing and an outer case 66 that covers most of the adsorbent 65. Examples of the adsorbent 65 include carbon-based adsorbents such as activated carbon, synthetic adsorbents, and silica gel. In one example, the adsorbent 65 is made of granular or powdered activated carbon molded into a desired shape. In this embodiment, the adsorbent 65 is formed into a cylindrical shape with a desired thickness and width (axial length). Furthermore, approximately the upper axial half of the adsorbent 65 is formed into an arc-shaped or C-ring-shaped shape with an opening corresponding to the second abutment surface S2 of the buffer member 62. The adsorbent 65 has an annular lower inner circumferential surface and an arc-shaped upper inner circumferential surface, an annular lower outer circumferential surface and an arc-shaped upper outer circumferential surface, an arc-shaped upper surface, an annular lower surface, and a pair of end surfaces connected to the upper and lower surfaces, which form the adsorption surface 65a. The adsorption surface 65a has a diameter and width (axial width) corresponding to the outer circumferential surface of the buffer member 62.

[0033] The outer case 66 is formed, for example, from a metal plate, and has the same shape as the outer surface of the adsorbent 65. That is, the lower part of the outer case 66 has a cylindrical shape, and the upper part has an arc shape or a C-ring shape. The inner peripheral side of the outer case 66 is open, i.e., it is open. The adsorbent 65 is stored or sealed inside the outer case 66. The outer surface (outer peripheral surface, upper surface, lower surface, end surfaces) of the adsorbent 65 except for the adsorption surface 65a is covered by the outer case 66. That is, only the adsorption surface 65a is exposed to the outside of the outer case 66.

[0034] 8 and 10, the suction unit 64 is coaxially attached to the buffer member 62 with the inner peripheral edge of the outer case 66 fitted to the outer peripheral surface of the buffer member 62. The suction unit 64 covers the outer peripheral surface of the buffer member 62 except for the portion of the second abutment surface S2. The suction surface 65a of the adsorbent 65 contacts the outer peripheral surface of the buffer member 62 except for the portion of the second abutment surface S2. As described above, the outer surface of the adsorbent 65 other than the suction surface 65a is covered by the outer case 66. Note that the suction surface 65a is not limited to being in contact with the outer peripheral surface of the buffer member 62, and may be configured to be adjacent to and facing the outer peripheral surface of the buffer member 62 with a small gap therebetween.

[0035] According to the outer stopper 60 configured as described above, the outgas generated from the surface of the buffer member 62 can be directly adsorbed by the adsorbent 65. This makes it possible to significantly reduce the amount of outgas diffusing into the housing. The shapes of the adsorbent 65 and the outer case 66 are not limited to a cylindrical shape or an arc shape, and various shapes are applicable. The adsorbent 65 only needs to have an adsorption surface 65a that covers the outer surface of the buffer member 62, and the shape of the other parts of the adsorbent 65 can be selected arbitrarily. Similarly, the outer case 66 only needs to have a shape that covers the outer surface of the adsorbent 65 excluding the adsorption surface 65a. Furthermore, the adsorption unit 64 is not limited to being attached to the buffer member 62, and may be attached to the bottom wall 12a via a support member.

[0036] In the HDD according to the first embodiment configured as described above, by providing the adsorbents 55, 65 in contact with or close to the buffer members 52, 62 of the stoppers, which are the source of outgassing, the outgassing generated from the buffer members can be directly and efficiently adsorbed by the adsorbents 55, 65, and the amount of outgassing diffusing into the housing can be significantly reduced. This makes it possible to provide a magnetic disk drive that can suppress problems caused by outgassing and improve reliability. In the first embodiment, the adsorbent is provided in both the inner stopper 50 and the outer stopper 60, but the present invention is not limited to this, and the adsorbent may be provided in only one of the inner stopper 50 and the outer stopper 60. Even in this case, the effect of reducing the amount of diffusion of outgas can be obtained.

[0037] Next, an HDD according to another embodiment will be described. In the following description of the other embodiment, the same parts as those in the first embodiment will be assigned the same reference numerals, and detailed descriptions thereof will be omitted or simplified. The following description will focus on the parts that differ from the first embodiment.

[0038] (Second embodiment) FIG. 11 is a perspective view showing an inner stopper of an HDD according to the second embodiment, and FIG. 12 is a perspective view showing a buffer member and a suction unit of the inner stopper with a part cut away. 11 and 12, in the second embodiment, the adsorbent 55 of the inner stopper 50 is configured to cover not only the outer peripheral surface of the buffer member 52 but also the upper end surface 52a of the buffer member 52. That is, the adsorbent 55 has an adsorbing surface 55a that is in contact with or adjacent to the outer peripheral surface of the buffer member 52 and an adsorbing surface 55b that is in contact with or adjacent to the upper end surface 52a of the buffer member 52, excluding the first contact surface S1. The outer case 56 covers the outer surfaces (outer peripheral surface, upper surface, lower surface, and end surfaces) of the adsorbent 55 excluding the adsorbing surfaces 55a and 55b.

[0039] FIG. 13 is a perspective view (a) and a vertical cross-sectional view (b) of an outer stopper according to the second embodiment. As shown in the drawings, in the second embodiment, the adsorbent 65 of the outer stopper 60 is configured to cover not only the outer peripheral surface of the buffer member 62 but also the lower end surface of the buffer member 62. That is, the adsorbent 65 has an adsorbing surface 65a in contact with or adjacent to the outer peripheral surface of the buffer member 62 and an adsorbing surface 65b in contact with or adjacent to the lower end surface of the buffer member 62, excluding the second contact surface. The outer case 66 covers the outer surfaces (outer peripheral surface, upper surface, lower surface, and end surfaces) of the adsorbent 65 excluding the adsorbing surfaces 65a and 65b.

[0040] In the second embodiment, the configuration of other parts of the HDD is the same as that of the HDD according to the first embodiment. According to the second embodiment, the adsorbents 55 and 65 can adsorb a larger amount of outgas, thereby further reducing the amount of outgas that diffuses into the housing.

[0041] (Third embodiment) FIG. 14 is a perspective view showing an inner stopper 50 of an HDD according to the third embodiment. As shown in the figures, according to the third embodiment, the suction unit does not include an outer case and is composed only of the suction material 55. In one example, the suction material 55 is formed into an arc-shaped or C-ring shape having a desired thickness and width, and has an arc-shaped inner circumferential surface as the suction surface 55a, an arc-shaped outer circumferential surface, arc-shaped upper and lower surfaces, and a pair of end surfaces connected to the upper and lower surfaces. The suction surface 55a has a diameter and width (axial width) corresponding to the outer circumferential surface of the buffer member 52. The adsorbent 55 is attached to the buffer member 52 and covers the outer peripheral surface of the buffer member 52 except for the first contact surface S1.

[0042] In the third embodiment having the above configuration, the outgas generated from the buffer member 52 can also be directly and efficiently adsorbed by the adsorbent 55, and the amount of outgas diffusing into the housing can be significantly reduced. Furthermore, according to the third embodiment, the outer case can be omitted, thereby reducing the number of parts.

[0043] (Fourth embodiment) FIG. 15 is a perspective view showing an inner stopper 50 of an HDD according to the fourth embodiment. As shown in the drawings, according to the fourth embodiment, the suction unit does not have an outer case and is composed only of the adsorbent 55. The adsorbent 55 is configured to cover not only the outer peripheral surface of the buffer member 52 but also the upper end surface 52a of the buffer member 52. That is, the adsorbent 55 has an adsorbing surface 55a in contact with the outer peripheral surface of the buffer member 52 and an adsorbing surface 55b in contact with the upper end surface 52a of the buffer member 52, excluding the first contact surface S1. According to the inner stopper 50 of the fourth embodiment, the adsorbent 55 can adsorb a larger amount of outgas, thereby further reducing the amount of outgas that diffuses into the housing. According to the fourth embodiment, the outer case is omitted, thereby making it possible to reduce the number of parts.

[0044] (Fifth embodiment) FIG. 16A is a perspective view showing the outer stopper 60 of the HDD according to the fifth embodiment. As shown in the figure, according to the fifth embodiment, the suction unit does not include an outer case and is composed only of an absorbent material 65. In one example, the absorbent material 65 is configured similarly to the absorbent material of the outer stopper according to the first embodiment. That is, the absorbent material 65 is formed as a whole in a cylindrical shape with a desired thickness and width (axial length). Furthermore, approximately the upper half of the axial portion is formed in an arc-like or C-ring shape with an opening corresponding to the second abutment surface S2 of the buffer member 62. The absorbent material 65 has an annular lower inner peripheral surface and an arc-like upper inner peripheral surface, an annular lower outer peripheral surface and an arc-like upper outer peripheral surface, an arc-like upper surface, an annular lower surface, and a pair of end surfaces connected to the upper and lower surfaces, which form the suction surface 65a. The suction surface 65a has a diameter and width (axial width) corresponding to the outer peripheral surface of the buffer member 62.

[0045] The adsorbent 65 is attached to the buffer member 62 and covers the outer peripheral surface of the buffer member 62 except for the second contact surface S2. In the fifth embodiment having the above configuration, the outgas generated from the buffer member 62 can also be directly and efficiently adsorbed by the adsorbent 65, and the amount of outgas diffusing into the housing can be significantly reduced. Furthermore, according to the fifth embodiment, the outer case can be omitted, thereby making it possible to reduce the number of parts.

[0046] (Sixth embodiment) 16(b) is a perspective view showing the outer stopper 60 of the HDD according to the sixth embodiment. As shown in the figure, according to the sixth embodiment, the suction unit does not include an outer case and is composed only of an absorbent material 65. In this embodiment, the absorbent material 65 is configured to cover not only the outer peripheral surface of the buffer member 62 but also the lower end surface 62b of the buffer member 62. That is, the absorbent material 65 has an absorbent surface in contact with the outer peripheral surface of the buffer member 62 and an absorbent surface in contact with the lower end surface of the buffer member 62, excluding the second contact surface S2. According to the outer stopper 60 of the sixth embodiment, the adsorbent 65 can adsorb a larger amount of outgas, thereby further reducing the amount of outgas that diffuses into the housing. In the sixth embodiment, too, the number of parts can be reduced by omitting the outer case.

[0047] Seventh embodiment FIG. 17 is a cross-sectional view of an HDD showing an inner stopper portion of the HDD according to the seventh embodiment, and FIG. 18 is a perspective view of the inner stopper according to the seventh embodiment. As shown in FIG. 17, the HDD has a support sleeve 38a erected on one end of a lower yoke 37a. The support sleeve 38a has a lower end that abuts against the upper surface of the lower yoke 37a and an upper end that abuts against the inner surface of the upper yoke 37b. The support sleeve 38a is sandwiched between the lower yoke 37a and the upper yoke 37b and erected approximately perpendicular to the lower yoke 37a. The bottom wall 12a has a boss 13a with a threaded hole. The boss 13a passes through the lower yoke 37a and extends into the lower end of the support sleeve 38a. The upper yoke 37b is fixed to the lower yoke 37a and bottom wall 12a with a fixing screw 40a that is threaded through the cover 14, the upper yoke 37b, and the support sleeve 38a and into the boss 13a of the bottom wall 12a.

[0048] According to this embodiment, the inner stopper 50 includes a buffer member 52 attached to the outer periphery of the support sleeve 38a, and a suction unit 54 provided around the buffer member 52. In one example, the buffer member 52 is formed in a cylindrical shape and is attached to the support sleeve 38a with its inner circumferential surface in close contact with the circumferential surface of the support sleeve 38a. 17 and 18, a part of the outer peripheral surface of the buffer member 52 forms a first contact surface S1 that comes into contact with the first contact portion 33a of the actuator assembly 22. The buffer member 52 is formed of an elastic buffer material such as rubber or elastomer.

[0049] The adsorption unit 54 includes an adsorbent 55 that adsorbs outgassing and an outer case 56 that covers most of the adsorbent 55. In one example, the adsorbent 55 is made of granular or powdered activated carbon molded into a desired shape. In this embodiment, the adsorbent 55 is molded into an arc-shaped or C-ring shape with a desired thickness and width. The adsorbent 55 has an arc-shaped inner circumferential surface serving as an adsorption surface 55a, an arc-shaped outer circumferential surface, arc-shaped upper and lower surfaces, and a pair of end surfaces connected to the upper and lower surfaces. The adsorption surface 55a has a diameter and width (axial width) corresponding to the outer circumferential surface of the buffer member 52.

[0050] The outer case 56 is formed from a metal plate or resin and has an arc shape or a C-ring shape. The inner peripheral side of the outer case 56, i.e., the stopper side, is open, i.e., is apertured. The adsorbent 55 is housed or sealed within the outer case 56. The outer surfaces (outer peripheral surface, upper surface, lower surface, and end surfaces) of the adsorbent 55 except for the adsorbing surface 55a are covered by the outer case 56. In other words, only the adsorbing surface 55a is exposed to the outside of the outer case 56.

[0051] The suction unit 54 is attached coaxially to the buffer member 52 with the inner peripheral edge of the outer case 56 fitted into the outer peripheral surface of the buffer member 52. The suction unit 54 covers the outer peripheral surface of the buffer member 52 except for the first contact surface S1. The suction surface 55a of the adsorbent 55 contacts the outer peripheral surface of the buffer member 52 except for the first contact surface S1. As described above, the outer surface of the adsorbent 55 other than the suction surface 55a is covered by the outer case 56. Note that the suction surface 55a is not limited to being in contact with the outer peripheral surface of the buffer member 52, and may be configured to be adjacent to and facing the outer peripheral surface of the buffer member 52 with a small gap therebetween.

[0052] According to the inner stopper 50 configured as described above, the outgas generated from the surface of the buffer member 52 can be directly adsorbed by the adsorbent 55. This makes it possible to significantly reduce the amount of outgas that diffuses into the housing. Furthermore, according to this embodiment, the outer surface of the adsorbent 55 is covered with the outer case 56, thereby achieving the effect of suppressing the diffusion of contamination generated from the adsorbent 55.

[0053] FIG. 19 is a cross-sectional view of an HDD showing an outer stopper portion of the HDD according to the seventh embodiment; FIG. 20 is a perspective view of the outer stopper according to the seventh embodiment. 19, the HDD has a support sleeve 38b erected on the other end of the lower yoke 37a. The support sleeve 38b is sandwiched between the lower yoke 37a and the upper yoke 37b and erected approximately perpendicular to the lower yoke 37a. The upper yoke 37b is fixed to the lower yoke 37a and bottom wall 12a with a fixing screw 40b that is threaded through the cover 14, the upper yoke 37b, and the support sleeve 38b and into the boss 13b on the bottom wall 12a.

[0054] According to the seventh embodiment, the outer stopper 60 includes a buffer member 62 attached to the outer periphery of the support sleeve 38b, and a suction unit 64 provided around the buffer member 62. In one example, the buffer member 62 is formed in a cylindrical shape and is attached to the support sleeve 38b with its inner circumferential surface in close contact with the circumferential surface of the support sleeve 38b. 19 and 20, a part of the outer peripheral surface of the buffer member 62 forms a second abutment surface S2 that abuts against the second abutment portion 33b of the actuator assembly 22. The buffer member 62 is formed of an elastic buffer material such as rubber or elastomer.

[0055] The adsorption unit 64 includes an adsorbent 65 that adsorbs outgassing and an outer case 66 that covers most of the adsorbent 65. In one example, the adsorption unit 64 has the same configuration as the adsorption unit 54 of the inner stopper 50. Therefore, a detailed description of the adsorption unit 64 will be omitted. The adsorption unit 64 is coaxially attached to the buffer member 62 with the inner peripheral edge of the outer case 66 fitted to the outer peripheral surface of the buffer member 62. The adsorption unit 64 covers the outer peripheral surface of the buffer member 62 except for the second contact surface S2. The adsorption surface 65a of the adsorbent 65 contacts the outer peripheral surface of the buffer member 62 except for the second contact surface S2. The outer surface of the adsorbent 65 other than the adsorption surface 65a is covered by the outer case 66. Note that the adsorption surface 65a is not limited to being in contact with the outer peripheral surface of the buffer member 52, and may be adjacent to and facing the outer peripheral surface of the buffer member 62 with a small gap therebetween.

[0056] According to the outer stopper 60 configured as described above, the outgas generated from the surface of the buffer member 62 can be directly adsorbed by the adsorbent 65. This makes it possible to significantly reduce the amount of outgas that diffuses into the housing. Furthermore, according to this embodiment, by covering the outer surface of the adsorbent 65 with the outer case 66, it is possible to obtain the effect of suppressing the diffusion of contamination generated from the adsorbent 65.

[0057] As described above, the seventh embodiment, in which the inner stopper 50 and the outer stopper 60 are provided on the support sleeves 38a, 38b, can also achieve the same effects as the first embodiment. That is, in the seventh embodiment, the outgas generated from the buffer members 52, 62 can be directly and efficiently adsorbed by the adsorbents 55, 65, and the amount of outgas diffusing into the housing can be significantly reduced.

[0058] (Eighth embodiment) FIG. 21 is a cross-sectional view of an HDD showing an inner stopper portion of the HDD according to the eighth embodiment, and FIG. 22 is a perspective view of the inner stopper according to the eighth embodiment. 21, according to this embodiment, the inner stopper 50 includes a buffer member 52 attached to the outer periphery of the support sleeve 38a, and a suction unit 54 provided around the buffer member 52. In one example, the buffer member 52 is formed in a cylindrical shape and is attached to the support sleeve 38a with its inner circumferential surface in close contact with the circumferential surface of the support sleeve 38a.

[0059] 21 and 22, a part of the outer peripheral surface of the buffer member 52 forms a first contact surface S1 that comes into contact with the first contact portion 33a of the actuator assembly 22. The buffer member 52 is formed of an elastic buffer material such as rubber or elastomer.

[0060] The adsorption unit 54 includes an adsorbent 55 that adsorbs outgassing and an outer case 56 that covers most of the adsorbent 55. In one example, the adsorption unit 54 is configured substantially similarly to the adsorption unit 54 in the seventh embodiment, and therefore differences will be mainly described in detail. According to the eighth embodiment, the adsorbent 55 of the adsorption unit 54 is configured to cover not only the outer peripheral surface of the buffer member 52 but also the upper end surface 52a of the buffer member 52. That is, the adsorbent 55 includes an adsorption surface 55a that contacts or is adjacent to the outer peripheral surface of the buffer member 52, and an adsorption surface 55b that contacts or is adjacent to the upper end surface 52a of the buffer member 52, excluding the first contact surface S1. The outer case 56 covers the outer surfaces (outer peripheral surface, upper surface, lower surface, and end surfaces) of the adsorbent 55, excluding the adsorption surfaces 55a and 55b.

[0061] FIG. 23 is a cross-sectional view of the HDD showing the outer stopper portion of the HDD according to the eighth embodiment, and FIG. 24 is a perspective view of the outer stopper according to the eighth embodiment. 23, according to the eighth embodiment, the outer stopper 60 includes a buffer member 62 attached to the outer periphery of the support sleeve 38b, and a suction unit 64 provided around the buffer member 62. In one example, the buffer member 62 is formed in a cylindrical shape and is attached to the support sleeve 38b with its inner circumferential surface in close contact with the circumferential surface of the support sleeve 38b. 23 and 24, a part of the outer peripheral surface of the buffer member 62 forms a second abutment surface S2 that abuts against the second abutment portion 33b of the actuator assembly 22. The buffer member 62 is formed of an elastic buffer material such as rubber or elastomer.

[0062] The adsorption unit 64 includes an adsorbent 65 that adsorbs outgassing and an outer case 66 that covers most of the adsorbent 65. In one example, the adsorption unit 64 has the same configuration as the adsorption unit 54 of the inner stopper 50. That is, the adsorbent 65 of the adsorption unit 64 is configured to cover not only the outer peripheral surface of the buffer member 62 but also the upper end surface 62a of the buffer member 62. The adsorbent 65 has an adsorption surface 65a that contacts or is adjacent to the outer peripheral surface of the buffer member 62 and an adsorption surface 65b that contacts or is adjacent to the upper end surface 62a of the buffer member 62, excluding the second abutment surface S2. The outer case 56 covers the outer surfaces (outer peripheral surface, upper surface, lower surface, and end surfaces) of the adsorbent 65 except for the adsorption surfaces 65a and 65b.

[0063] As described above, the eighth embodiment, in which the inner stopper 50 and the outer stopper 60 are provided on the support sleeves 38a, 38b, can also achieve the same effects as the first embodiment. That is, in the eighth embodiment, the outgas generated from the buffer members 52, 62 can be directly and efficiently adsorbed by the adsorbents 55, 65, and the amount of outgas diffusing into the housing can be significantly reduced. Furthermore, according to the eighth embodiment, the adsorbents 55, 56 cover the circumferential and end surfaces of the buffer members 52, 62, so that the adsorbents 55, 65 can adsorb even more outgas, thereby further reducing the amount of outgas diffusing into the housing.

[0064] (Ninth embodiment) FIG. 25 is a cross-sectional view of an HDD showing an inner stopper portion of the HDD according to the ninth embodiment, and FIG. 26 is a perspective view of the inner stopper according to the ninth embodiment. 25, according to this embodiment, the inner stopper 50 includes a buffer member 52 attached to the outer periphery of the support sleeve 38a, and an adsorbent 55 provided around the buffer member 52. In one example, the buffer member 52 is formed in a cylindrical shape and is attached to the support sleeve 38a with its inner circumferential surface in close contact with the circumferential surface of the support sleeve 38a.

[0065] 25 and 26, a part of the outer peripheral surface of the buffer member 52 forms a first contact surface S1 that comes into contact with the first contact portion 33a of the actuator assembly 22. The buffer member 52 is formed of an elastic buffer material such as rubber or elastomer.

[0066] According to the ninth embodiment, the suction unit does not include an outer case and is composed only of the suction material 55. In one example, the suction material 55 is formed into an arc-shaped or C-ring shape having a desired thickness and width, and has an arc-shaped inner circumferential surface as the suction surface 55a, an arc-shaped outer circumferential surface, arc-shaped upper and lower surfaces, and a pair of end surfaces connected to the upper and lower surfaces. The suction surface 55a has a diameter and width (axial width) corresponding to the outer circumferential surface of the buffer member 52. The adsorbent 55 is attached to the buffer member 52 and covers the outer peripheral surface of the buffer member 52 except for the first contact surface S1.

[0067] FIG. 28 is a cross-sectional view of the HDD showing the outer stopper portion of the HDD according to the ninth embodiment, and FIG. 26 is a perspective view of the outer stopper according to the ninth embodiment. 28, according to this embodiment, the outer stopper 60 includes a buffer member 62 attached to the outer periphery of the support sleeve 38b, and an adsorbent 65 provided around the buffer member 62. In one example, the buffer member 62 is formed in a cylindrical shape and is attached to the support sleeve 38b with its inner circumferential surface in close contact with the circumferential surface of the support sleeve 38b.

[0068] 28 and 29, a part of the outer peripheral surface of the buffer member 62 forms a second abutment surface S2 that abuts against the second abutment portion 33b of the actuator assembly 22. The buffer member 62 is formed of an elastic buffer material such as rubber or elastomer.

[0069] According to the ninth embodiment, the suction unit does not include an outer case and is composed only of the suction material 65. In one example, the suction material 65 is formed into an arc-shaped or C-ring shape having a desired thickness and width, and has an arc-shaped inner circumferential surface as the suction surface 65a, an arc-shaped outer circumferential surface, arc-shaped upper and lower surfaces, and a pair of end surfaces connected to the upper and lower surfaces. The suction surface 65a has a diameter and width (axial width) corresponding to the outer circumferential surface of the buffer member 62. The adsorbent 65 is attached to the buffer member 62 and covers the outer peripheral surface of the buffer member 62 except for the second contact surface S2. The adsorbent surface 65a is in contact with the outer peripheral surface of the buffer member 62.

[0070] As described above, the ninth embodiment, in which the inner stopper 50 and the outer stopper 60 are provided on the support sleeves 38a, 38b, can also achieve the same effects as the first embodiment. That is, in the ninth embodiment, the outgas generated from the buffer members 52, 62 can be directly and efficiently adsorbed by the adsorbents 55, 65, and the amount of outgas diffusing into the housing can be significantly reduced. Furthermore, according to the ninth embodiment, the outer case can be omitted, thereby reducing the number of parts.

[0071] (Tenth embodiment) FIG. 27 is a perspective view showing the inner stopper 50 of the HDD according to the tenth embodiment. As shown in the drawings, according to the tenth embodiment, the suction unit of the inner stopper 50 does not have an outer case and is composed only of the adsorbent 55. The adsorbent 55 is configured to cover not only the outer peripheral surface of the buffer member 52 but also the upper end surface 52a of the buffer member 52. In other words, the adsorbent 55 has an adsorbing surface 55a in contact with the outer peripheral surface of the buffer member 52 and an adsorbing surface 55b in contact with the upper end surface 52a of the buffer member 52, excluding the first contact surface S1.

[0072] FIG. 30 is a perspective view showing the outer stopper 60 of the HDD according to the tenth embodiment. As shown in the drawings, according to the tenth embodiment, the suction unit of the outer stopper 60 does not have an outer case and is composed only of the adsorbent 65. The adsorbent 65 is configured to cover not only the outer peripheral surface of the buffer member 62 but also the upper end surface 62a of the buffer member 62. In other words, the adsorbent 65 has an adsorbing surface 65a in contact with the outer peripheral surface of the buffer member 62 and an adsorbing surface 65b in contact with the upper end surface 62a of the buffer member 62, excluding the second contact surface S2.

[0073] As described above, the tenth embodiment, in which the inner stopper 50 and the outer stopper 60 are provided on the support sleeves 38a and 38b, can achieve the same effects as the first embodiment. That is, in the tenth embodiment, the outgas generated from the buffer members 52 and 62 can be directly and efficiently adsorbed by the adsorbents 55 and 65, thereby significantly reducing the amount of outgas diffusing into the housing. Furthermore, according to the tenth embodiment, the adsorbents 55 and 56 cover the circumferential and end surfaces of the buffer members 52 and 62, allowing the adsorbents 55 and 65 to adsorb even more outgas, further reducing the amount of outgas diffusing into the housing. According to the tenth embodiment, the omission of the outer case allows for a reduction in the number of parts.

[0074] The present invention is not limited to the above-described embodiments, and the components can be modified and embodied in practice without departing from the spirit of the invention. Furthermore, various inventions can be formed by appropriately combining multiple components disclosed in the above embodiments. For example, some components may be omitted from all the components shown in the embodiments. Furthermore, components from different embodiments may be appropriately combined.

[0075] Fig. 31 is a diagram showing other Examples 11-26, which are constructed by combining various embodiments. Although the illustration of the buffer members is omitted in Fig. 31, it goes without saying that each Example includes a buffer member. In the eleventh embodiment, the inner stopper has a stopper pin and an adsorbent, and the outer stopper has a stopper pin and an adsorbent. In the twelfth embodiment, the inner stopper has a stopper pin and an adsorbent, and the outer stopper has a stopper pin, an adsorbent, and an outer case. In the thirteenth embodiment, the inner stopper has a stopper pin, an adsorbent, and an outer case, and the outer stopper has a stopper pin and an adsorbent. In the fourteenth embodiment, the inner stopper has a stopper pin, an adsorbent, and an outer case, and the outer stopper has a stopper pin, an adsorbent, and an outer case. In the fifteenth embodiment, the inner stopper has a support sleeve and an adsorbent, and the outer stopper has a support sleeve and an adsorbent. In the sixteenth embodiment, the inner stopper has a support sleeve and an adsorbent, and the outer stopper has a support sleeve, an adsorbent, and an outer case. In the seventeenth embodiment, the inner stopper has a support sleeve, an adsorbent, and an outer case, and the outer stopper has a support sleeve and an adsorbent. In the eighteenth embodiment, the inner stopper has a support sleeve, an adsorbent, and an outer case, and the outer stopper has a support sleeve, an adsorbent, and an outer case. In the nineteenth embodiment, the inner stopper has a stopper pin and an adsorbent, and the outer stopper has a support sleeve and an adsorbent. In the twentieth embodiment, the inner stopper has a stopper pin and an adsorbent, and the outer stopper has a support sleeve, an adsorbent, and an outer case. In the twenty-first embodiment, the inner stopper has a stopper pin, an adsorbent, and an outer case, and the outer stopper has a support sleeve and an adsorbent. In the twenty-second embodiment, the inner stopper has a stopper pin, an adsorbent, and an outer case, and the outer stopper has a support sleeve, an adsorbent, and an outer case. In the twenty-third embodiment, the inner stopper has a support sleeve and an adsorbent, and the outer stopper has a stopper pin and an adsorbent. In the twenty-fourth embodiment, the inner stopper has a support sleeve and an adsorbent, and the outer stopper has a stopper pin, an adsorbent, and an outer case. In the twenty-fifth embodiment, the inner stopper has a support sleeve, an adsorbent, and an outer case, and the outer stopper has a stopper pin and an adsorbent. In the twenty-sixth embodiment, the inner stopper has a support sleeve, an adsorbent, and an outer case, and the outer stopper has a support sleeve, an adsorbent, and an outer case.

[0076] In the various embodiments described above, the buffer member is not limited to a cylindrical shape and various shapes can be selected. It is sufficient that the buffer member has an abutment portion that abuts against the actuator assembly. Furthermore, the adsorbent or adsorption unit is not limited to being provided on both the inner stopper and the outer stopper, but may be provided on only one of the stoppers. Even in this case, the effect of reducing the amount of outgassing can be obtained. [Explanation of symbols]

[0077] 10... housing, 12... base, 12a... bottom wall, 12b... side wall, 17... magnetic head, 18...magnetic disk, 19...spindle motor, 22...actuator assembly, 25... Ramp load mechanism, 30... Suspension assembly, 32... Arm, 33a...first contact part, 33b...second contact part, 37a...lower yoke, 37b...upper yoke, 38a, 38b...support sleeve, 50...inner stopper (first stopper), 60...outer stopper (second stopper), 51, 61... stopper pin, 52, 62... buffer member, 54, 64... suction unit, 55, 65...adsorbent material, 55a, 65a...adsorbing surface, 56, 66...outer case

Claims

1. a disk-shaped recording medium; a pivotally mounted actuator assembly; a magnetic head supported by the actuator assembly; a first stopper and a second stopper arranged to be able to come into contact with the actuator assembly, At least one of the first stopper and the second stopper comprises a buffer member having an abutment surface that can abut against the actuator assembly, and a gas adsorbent material that surrounds the buffer member except for the abutment surface.

2. the buffer member has a circumferential surface including the contact surface, 2. The disk device according to claim 1, wherein the gas adsorbent has an adsorption surface that covers the peripheral surface except for the contact surface.

3. The disk device according to claim 2 , wherein the suction surface is in contact with the peripheral surface.

4. the buffer member has a peripheral surface including the contact surface and an end surface, 2. The disk device according to claim 1, wherein the gas adsorbent has a first adsorption surface that covers the peripheral surface except for the contact surface, and a second adsorption surface that covers the end surface.

5. 3. The disk device according to claim 2, wherein the at least one stopper comprises an outer case that covers an outer surface of the gas adsorbent material excluding the adsorption surface.

6. 2. The disk device according to claim 1, wherein the at least one stopper includes a stopper pin and the buffer member attached to the stopper pin.

7. 2. The disk drive according to claim 1, wherein the at least one stopper includes a support sleeve and the buffer member attached to the support sleeve.

Images