Cover and recording device

Abstract

Provided is a cover capable of suppressing occurrence of failure on a mating member side fastened to a deformed cover. A cover 9 comprises: a cover body 11; a contact surface 17a that is a mating member with respect to a device body 2; and a fastening surface 21a that is, with respect to a pivot shaft 29, a mating member located inside the contact surface 17a in a plan view. The fastening surface 21a is inclined with respect to the contact surface 17a.

Description

Cover and Recording Device

[0001] The present invention relates to a cover used for a recording device such as a hard disk drive and a recording device using the same.

[0002] As a conventional recording device, for example, there is one described in Patent Document 1. In this recording device, a cover that covers the opening is attached to the base plate while abutting on the outer peripheral portion, and an access portion including a disk as a recording medium and a read / write head inside is held.

[0003] In the base plate, a support column is attached to the support column attachment portion. The access portion is attached to this support column via a pivot assembly so as to be rotatable. Further, a cover is fastened to the tip of the support column.

[0004] When distortion occurs in the support column attachment portion, laser light is irradiated to ensure flatness. As a result, the support column is corrected in its axial direction.

[0005] However, even if the flatness of the support column attachment portion can be ensured, if the cover is deformed, the fastening portion of the cover may be inclined with respect to the support column. For example, when a gasket is interposed between the base plate and the cover, the cover may be deformed by the reaction force of the gasket or the like. In addition, the cover may be deformed due to distortion during molding.

[0006] When the tip of the support column is fastened to the fastening portion of the cover inclined due to such deformation, the support column may be inclined by receiving a bending force due to the inclination of the cover, or there is a possibility that the support column may locally abut on the cover even if it does not incline. In these cases, there may be problems in the operation of the access portion supported by the support column.

[0007] Such problems may occur not only in the pivot shaft of the carriage arm but also in those fastened to the cover, such as a motor that drives the carriage arm.

[0008] Japanese Patent Application Laid-Open No. 2016-110675

[0009] The problem to be solved is that there is a risk of causing problems on the mating member side fastened to the deformed cover.

[0010] The present invention provides a cover comprising a cover body, a contact surface with respect to a mating member, and a fastening surface with respect to the mating member located on the inside of the contact surface in a plan view, wherein the fastening surface is inclined with respect to the contact surface.

[0011] Furthermore, the present invention provides a recording device comprising a cover and a device body to which the cover is attached, the recording device comprising a first receiving surface provided on the device body that receives the contact surface of the cover, and a second receiving surface provided on the device body that receives the fastening surface of the cover and fastens it.

[0012] According to the present invention, it is possible to suppress the occurrence of defects on the mating member side that is fastened to the deformed cover.

[0013] Figure 1 is a plan view of a recording device according to Embodiment 1 of the present invention. Figure 2 is a cross-sectional view taken along line II-II of the recording device in Figure 1. Figure 3 is an enlarged cross-sectional view showing a part of the fastening portion between the cover and the main body of the recording device in Figure 2. Figure 4 is a cross-sectional view showing the state of the cover of the recording device in Figure 3 before it is attached. Figures 5(A) to 5(C) are cross-sectional views showing the cover according to Embodiment 1 from before it is attached to the main body until it is attached. Figure 6(A) is a cross-sectional view showing a part of the fastening portion between the cover and the main body of a recording device according to a comparative example, and Figure 6(B) is a cross-sectional view showing the state of the cover in Figure 6(A) before it is attached. Figure 7(A) is a graph showing the inclination of the fastening surface before and after the attachment of the cover according to Embodiment 1, and Figure 7(B) is a graph showing the inclination of the fastening surface before and after the attachment of the cover according to a comparative example. Figure 8 is a cross-sectional view showing the fastening portion between the cover of the recording device according to Embodiment 2 of the present invention and the pivot shaft and voice coil motor of the main body of the device. Figure 9 is a cross-sectional view showing the state of the cover of the recording device in Figure 8 before it is attached. Figure 10 is a cross-sectional view showing the fastening portion between the cover and the main body of a recording device according to Embodiment 3 of the present invention. Figure 11 is a cross-sectional view showing the state of the recording device in Figure 10 before the cover is attached.

[0014] In one embodiment, the cover 9 comprises a cover body 11, a contact surface 17a, and fastening surfaces 19a, 21a, and 23a. The contact surface 17a is the surface that contacts the mating member 7. The fastening surfaces 19a, 21a, and 23a are located on the inside of the contact surface 17a in a plan view and are surfaces that are fastened to the mating members 43, 29, and 35. The fastening surfaces 19a, 21a, and 23a are inclined with respect to the contact surface 17a of the cover body 11.

[0015] The fastening surfaces 19a, 21a, and 23a can be in any shape as long as they can be fastened to the mating members 43, 29, and 35. In one embodiment, the cover 9 may include boss portions 19, 21, and 23 which include the fastening surfaces 19a, 21a, and 23a. The boss portions 19, 21, and 23 are concave relative to the surface 11a of the cover body 11 and convex relative to the back surface 11b of the cover body 11, with the fastening surfaces 19a, 21a, and 23a at the convex tips.

[0016] Furthermore, a gasket 13, which is a sealing material, may be provided on the back surface 11b of the cover body 11 in the vicinity of the contact surface 17a of the cover 9.

[0017] The recording device 1 using the cover 9 comprises the cover 9 and the device body 2 to which the cover 9 is attached. The device body 2 comprises a first receiving surface 10a and second receiving surfaces 29a, 43a, and 35a. The first receiving surface 10a receives the contact surface 17a of the cover 9. The second receiving surfaces 29a, 43a, and 35a receive and fasten the fastening surfaces 21a, 19a, and 23a of the cover 9.

[0018] The main body of the device 2 has a base 7 which is a housing, and the first receiving surface 10a may be provided on the upper surface of the side wall portion 7a of the base 7.

[0019] The main body of the device 2 has shafts 29 and 43 held along the mounting direction of the cover 9, and the second receiving surfaces 29a and 43a may be provided at the ends of the shafts 29 and 43. The shafts 29 and 43 can be pivot shafts or spindle shafts.

[0020] The pivot shaft 29 is a shaft for supporting the head 6 for reading and writing to the recording medium 5. The spindle shaft 43 is a shaft for supporting the recording medium 5.

[0021] The device body 2 has a motor 35 that drives the head 6 relative to the pivot shaft 29, and the second receiving surface 35a may be provided on the pivot shaft 29 and the motor 35. In this case, the fastening surfaces 21a and 23a are provided at positions corresponding to the second receiving surfaces 29a and 35a of the pivot shaft 29 and motor 35 of the cover body 11, respectively.

[0022] [Recording Device] Figure 1 is a plan view of a recording device according to Embodiment 1 of the present invention. Figure 2 is a cross-sectional view taken along line II-II of the recording device in Figure 1. Figure 3 is an enlarged cross-sectional view showing a part of the fastening portion between the cover and the main body of the recording device in Figure 2. Figure 4 is a cross-sectional view showing the state before the cover in Figure 3 is attached.

[0023] The recording device 1 in Figures 1 and 2 is a hard disk drive as a magnetic disk device, and consists of a device body 2 and a cover 9.

[0024] The main body 2 of the device is the main body portion of the recording device 1 to which the cover 9 is attached. This main body 2 is constructed by housing an internal mechanism 4, such as a plurality of disks 5 which are recording media, within a base 7. The recording device 1 may be other disk devices such as optical disk drives, or other recording devices such as tape drives that use magnetic tape as a recording medium.

[0025] The internal mechanism 4 is a mechanism for driving multiple disks 5 to read and write information. The multiple disks 5 are supported in a stacked state and rotatably supported by a spindle motor 40. The stacking direction of the disks 5 is the thickness direction of the recording device 1 (hereinafter simply referred to as the "thickness direction"). Information is read and written to these disks 5 by a head 6.

[0026] The head 6 is supported by a plurality of head suspensions 8, each supported by a carriage 33. The carriage 33 is pivotably supported on a pivot shaft 29. By pivoting the carriage 33 around the pivot shaft 29, the head 6 can be moved to the desired track on the disc 5. The rotation of the carriage 33 is performed by a motor, such as a voice coil motor 35.

[0027] The base 7 is a box-shaped housing made of a metal such as aluminum, with one end in the thickness direction of the recording device 1 being open. The base 7 only needs to be able to accommodate the internal mechanism 4, and can take any shape that fits within that constraint. In this embodiment, the base 7 is, for example, a box with a roughly rectangular shape in plan view.

[0028] The base 7 is closed by attaching a cover 9 to an opening in the thickness direction. The base 7 and cover 9 together constitute the housing 3 that accommodates the internal mechanism 4. In this embodiment, the mounting direction of the cover 9 coincides with the thickness direction of the recording device 1.

[0029] The outer periphery of the base 7 is provided with a side wall portion 7a in a circular manner, and the opening of the base 7 is demarcated by the side wall portion 7a. The outer periphery of the base 7 is the outer region surrounding the internal mechanism including the disk 5, and in this embodiment, it refers to the portion where the side wall portion 7a is provided.

[0030] The side wall portion 7a is erected in the thickness direction from the plate-shaped bottom portion 7b of the base 7. The spindle motor 40, pivot shaft 29, and voice coil motor 35 are held on the bottom portion 7b of the base 7.

[0031] Covers 9 are fastened to the spindle shaft 43, pivot shaft 29, and voice coil motor 35 of the spindle motor 40. In this embodiment, the tips of the spindle shaft 43, pivot shaft 29, and voice coil motor 35 are second receiving surfaces 43a, 29a, and 35a, respectively, which are planes perpendicular to the axial direction. The spindle shaft 43, pivot shaft 29, and voice coil motor 35 are held separately from the base 7. This holding can be performed by any appropriate method.

[0032] The second receiving surfaces 43a, 29a, and 35a are surfaces that receive and fasten the fastening surfaces 19a, 21a, and 23a of the cover 9, respectively. Note that the second receiving surfaces 43a, 29a, and 35a do not need to be perpendicular to the axial direction of the pivot shaft 29; they only need to intersect in the mounting direction of the cover 9. Furthermore, the second receiving surfaces 43a, 29a, and 35a do not need to be flat; they may have irregularities.

[0033] As shown in Figure 3, the upper surface of the side wall portion 7a of the base 7 is provided with a first receiving surface 10a and a sealing surface 10b. Therefore, the device body 2 is configured to have the first receiving surface 10a and the sealing surface 10b.

[0034] In this embodiment, the first receiving surfaces 10a are provided in multiple locations, for example six, at intervals in the circumferential direction of the base 7. The first receiving surfaces 10a may also be formed in a circumferential manner along the outer circumference of the base 7. The circumferential direction of the base 7 refers to the circumferential direction along the side wall portion 7a of the base 7.

[0035] This first receiving surface 10a is the surface that receives the contact surface 17a of the cover 9 by contacting it in the mounting direction. In this contact state, the cover 9 is fastened to the base 7. In this embodiment, the direction of fastening (hereinafter referred to as the fastening direction) coincides with the thickness direction.

[0036] Fastening is performed using fasteners, such as bolts 37. In this embodiment, the cover 9 is also fastened to the spindle shaft 43, pivot shaft 29, and voice coil motor 35 with bolts 49, 31, and 39, as described above. In addition to bolts, rivets or the like may be used as fasteners.

[0037] In this embodiment, the first receiving surface 10a is a plane perpendicular to the thickness direction. However, the first receiving surface 10a does not need to be a plane, as long as it can receive the cover 9 in the mounting direction, and it may also be inclined with respect to the direction perpendicular to the thickness direction.

[0038] A sealing surface 10b is provided on the inside of the first receiving surface 10a. The inside of the first receiving surface 10a refers to the side closer to the center of the cover 9 in a plan view.

[0039] The sealing surface 10b is the surface that receives the gasket 13 attached to the cover 9. By receiving the gasket 13 on the sealing surface 10b, the gasket 13 is compressed in the thickness direction between the base 7 and the cover 9.

[0040] The sealing surface 10b is formed as a plane perpendicular to the thickness direction, and the first receiving surface 10a of the base 7 is flat and continuous with it. However, the sealing surface 10b does not need to be flat as long as it can receive the gasket 13, and it may also be inclined with respect to the direction perpendicular to the thickness direction.

[0041] The cover 9 is made of a metal such as aluminum and comprises a cover body 11 and a gasket 13, as shown in Figures 3 and 4.

[0042] The cover body 11 is configured as a plate overall. This cover body 11 has a contact surface 17a that abuts against the first receiving surface 10a of the base 7. In this embodiment, multiple contact surfaces 17a are formed on the outer peripheral portion 15 of the cover body 11, corresponding to the first receiving surface 10a of the base 7. The outer peripheral portion 15 of the cover 9 is the outer peripheral region surrounding the internal mechanism including the disk 5, and in this embodiment, it refers to the portion facing the side wall portion 7a of the base 7.

[0043] The contact surface 17a consists of a plane perpendicular to the thickness direction. In this embodiment, the contact surface 17a is provided on the fastening portion 17 of the cover 9 to the base 7. The fastening portion 17 is formed in a stepped shape on the outer peripheral portion 15 of the cover body 11 and protrudes toward the base 7 side in the thickness direction relative to the cover body 11. The contact surface 17a is formed by the base 7 side surface of this fastening portion 17. Note that the contact surface 17a of the cover 9 does not need to be provided on the fastening portion 17.

[0044] The cover body 11 of this embodiment includes boss portions 19, 21, and 23 inside the outer peripheral portion 15. The boss portions 19, 21, and 23 respectively protrude from the back surface 11b of the cover body 11 toward the base 7 side, are concave with respect to the surface of the front surface 11a of the cover body 11, and are convex with respect to the back surface 11b of the cover body 11. The boss portions 19, 21, and 23 have fastening surfaces 19a, 21a, and 23a at their convex tips. Note that instead of having the boss portions 19, 21, and 23, for example, a part of the back surface 11b of the cover body 11 may be used as the fastening surfaces 19a, 21a, and 23a. The front surface 11a of the cover body 11 faces outward of the housing 3 in the state of being attached to the base 7 of the cover 9, and the back surface 11b faces inward of the housing 3.

[0045] These boss portions 19, 21, and 23 are respectively fastened by bolts 49, 31, and 39 with the fastening surfaces 19a, 21a, and 23a being abutted against the second receiving surfaces 43a, 29a, and 35a of the spindle shaft 43, the pivot shaft 29, and the voice coil motor 35 of the device body 2 which are mating members. Therefore, the cover 9 has a configuration including the fastening surfaces 19a, 21a, and 23a located inside in a plan view with respect to the abutting surface 17a.

[0046] In this embodiment, before attaching the cover 9 to the device body 2, the fastening surfaces 19a and 23a are arranged parallel to the abutting surface 17a, and the fastening surface 21a is inclined with respect to the abutting surface 17a as shown in FIG. 4. The inclination of this fastening surface 21a can be achieved by adjusting the shape such as the depth of the boss portion 21 with respect to the front surface 11a of the cover body 11 or the thickness of the bottom wall 21b. In the state where the cover 9 is attached to the device body 2, as shown in FIG. 3, the inclination of the fastening surface 21a is corrected by the deformation of the cover 9, and the fastening surface 21a is parallel to the abutting surface 17a.

[0047] The fastening surface 21a and the abutting surface 17a do not necessarily need to be exactly parallel. That is, the parallelism between the fastening surface 21a and the abutting surface 17a may be set within the range where the inclination of the pivot shaft 29 is allowed.

[0048] The deformation of the cover 9 is caused by the reaction force of the gasket 13 in this embodiment, but it may also be caused by the molding of the cover 9, temperature changes, and other factors. The degree of inclination of the fastening surface 21a is set according to the tendency of deformation of the cover 9. The inclination can be set by pressing or irradiating with a laser beam or the like. Note that the tendency of deformation of the cover 9 may be confirmed in advance by experiments or the like.

[0049] The gasket 13 is arranged in a circumferential shape in a plan view along the outer peripheral portion 15 of the cover body 11. This gasket 13 is provided on the back surface 11b of the cover body 11 in the vicinity of the contact surface 17a of the cover 9. As described above, the gasket 13 is compressed between the cover 9 and the base 7 in a state of contacting the seal surface 10b of the base 7. Thereby, the gasket 13 seals between the cover 9 and the base 7.

[0050] The reaction force (restoring force) due to the compression of the gasket 13 acts on the cover body 11. Therefore, the cover body 11 is deformed so as to gradually separate from the base 7 toward the inside with respect to the fastening portion 17 by the bolt 37.

[0051] Due to the deformation of the cover 9, the fastening surface 21a becomes parallel to the contact surface 17a as described above, and as a result, it becomes parallel to the second receiving surface 29a of the pivot shaft 29.

[0052] [Attachment of Cover] FIGS. 5(A) to (C) are cross-sectional views showing from before to after the attachment of the cover according to Embodiment 1 to the apparatus main body.

[0053] When attaching the cover 9 to the apparatus main body 2, as shown in FIG. 5(A), the cover 9 is positioned so as to close the opening of the base 7 of the apparatus main body 2. Then, as shown in FIG. 5(B), the contact surface 17a of the fastening portion 17 of the cover 9 is brought into contact with the first receiving surface 10a of the apparatus main body 2 (base 7), and the fastening portion 17 of the outer peripheral portion 15 of the cover 9 is fastened to the apparatus main body 2 (base 7) by bolts 37.

[0054] This fastening compresses the gasket 13 between the cover 9 and the base 7, and the reaction force causes a portion of the cover body 11 to deform inward, gradually separating from the base 7. This deformation causes the cover body 11 to tilt, and this tilt of the cover body 11 corrects the tilt of the fastening surface 21a. As a result, the fastening surface 21a becomes parallel to or nearly parallel to the second receiving surface 29a of the pivot shaft 29.

[0055] In this state, the boss portion 21 of the cover 9 is fastened to the tip of the pivot shaft 29 with a bolt 31, as shown in Figure 5(C). This causes the fastening surfaces 21a of the cover 9 and the second receiving surface 29a of the pivot shaft 29 to come into contact and be fastened together, with the surfaces being parallel or nearly parallel to each other.

[0056] Therefore, the pivot shaft 29 is aligned in the thickness direction while fastened to the fastening surface 21a of the deformed cover 9. This stabilizes the movement of the carriage 33 supported by the pivot shaft 29 and ensures the positioning accuracy of the head 6 relative to the disk 5. Consequently, the occurrence of malfunctions on the mating member (pivot shaft 29) side that is fastened to the deformed cover 9 can be suppressed.

[0057] Figure 6(A) is a cross-sectional view showing a portion of the fastening between the cover and base of a recording device according to a comparative example, and Figure 6(B) is a cross-sectional view showing the state of the cover in Figure 6(A) before it is attached.

[0058] In this comparative example, as shown in Figure 6(B), the fastening surface 21aX of the cover 9X before installation is parallel to the contact surface 17a. As shown in Figure 6(A), when the cover 9X deforms and tilts due to the reaction force from the gasket 13, the fastening surface 21aX tilts accordingly.

[0059] Therefore, when the inclined fastening surface 21aX is fastened to the second receiving surface 29a of the pivot shaft 29 with bolts 31, the pivot shaft 29 will tilt in accordance with the highly rigid cover 9X, as in the conventional design. In this case, the rotation axis of the carriage 33 will tilt, and abnormal rotation or misalignment of the carriage 33 may reduce the positioning accuracy of the head 6 relative to the disk 5, potentially leading to malfunctions in operation. Even if the pivot shaft 29 does not tilt, local contact of the second receiving surface 29a of the pivot shaft 29 with the fastening surface 21aX may occur. In this case as well, abnormal rotation or misalignment of the carriage 33, or deformation of the pivot shaft 29, may occur, potentially leading to malfunctions in the operation of the carriage 33.

[0060] In contrast, this embodiment can suppress problems such as deformation and tilting of the pivot shaft 29, as well as abnormal rotation and misalignment of the carriage 33, which uses the pivot shaft 29 as its axis of rotation, as seen in the comparative example.

[0061] Figures 7(A) and 7(B) are graphs showing the inclination of the fastening surface before and after the cover is installed, with Figure 7(A) being an example and Figure 7(B) being a comparative example.

[0062] In Figures 7(A) and 7(B), the horizontal axis represents the circumferential position of the fastening surface, and the vertical axis represents the position of the fastening surface in the thickness direction of the recording device 1. The dotted-dotted rectangular frame in Figure 7(A) corresponds to the dotted-dotted rectangular frame in Figure 4, and the double-dotted rectangular frame in Figure 7(A) represents the double-dotted rectangular frame in Figure 4. The dotted-dotted and double-dotted rectangular frames in Figure 7(B) correspond to the dotted-dotted and double-dotted rectangular frames in Figure 6(B).

[0063] As shown in Figures 7(A) and (B), the order in which the inclination occurs is reversed compared to Example 1 in Figures 3 and 4 and the comparative example in Figures 5 and 6. Furthermore, the inclination of the fastening surface 21a in Figures 7(A) and (B) is directed in a specific direction in the circumferential direction.

[0064] In this embodiment, before attaching the cover 9 in Figure 4 to the base 7, the fastening surface 21a is inclined in a specific direction in the circumferential direction, as shown by line segment L1 in Figure 7(A). After attaching the cover 9 in Figure 3 to the base 7, it can be seen that the inclination of the fastening surface 21a in a specific direction in the circumferential direction is gone, as shown by line segment L2 in Figure 7(A).

[0065] In contrast, in the comparative example, before attaching the cover 9 in Figure 6(B) to the base 7, there is no inclination of the fastening surface 21a in a specific direction in the circumferential direction, as shown by line segment L3 in Figure 7(B). After attaching the cover 9 in Figure 6(A) to the base 7, it can be seen that the fastening surface 21a is inclined in a specific direction in the circumferential direction, as shown by line segment L4 in Figure 7(B).

[0066] As described above, the cover 9 of this embodiment includes a cover body 11, a contact surface 17a provided on the cover body 11 that contacts the first receiving surface 10a of the mating member, the device body 2, and a fastening surface 21a that is located on the inside of the contact surface 17a in a plan view and contacts the pivot shaft 29 of the mating member, the device body 2. The fastening surface 21a is inclined with respect to the contact surface 17a.

[0067] Therefore, when deformation occurs in the cover 9, the fastening surface 21a approaches a state that is at least parallel to the contact surface 17a in accordance with the deformation of the cover 9. As a result, the tilt of the pivot shaft 29 fastened to the fastening surface 21a is suppressed. Consequently, the occurrence of problems with the positioning accuracy of the head 6 on the pivot shaft 29 side can be suppressed.

[0068] Furthermore, the cover 9 in this embodiment is concave relative to the surface 11a of the cover body 11 and convex relative to the back surface 11b of the cover body 11. Since the convex tip is equipped with a boss portion 21 including a fastening surface 21a, the fastening surface 21a can be easily and reliably tilted by adjusting the shape of the boss portion 21.

[0069] Furthermore, since the cover 9 in this embodiment is equipped with a gasket 13 on the back surface 11b of the cover body 11, it is reliably deformed by the reaction force of the gasket 13 when attached to the mating member, the device body 2. Therefore, the fastening surface 21a, which was inclined before the cover 9 was attached to the base 7, can be reliably brought closer to being parallel to the contact surface 17a.

[0070] The recording device 1 of this embodiment comprises a cover 9 and a device body 2 to which the cover 9 is attached. The device body 2 comprises a first receiving surface 10a that receives the contact surface 17a of the cover 9 and a second receiving surface 29a that receives and fastens the fastening surface 21a of the cover 9.

[0071] Furthermore, the main body of the device 2 is held along the mounting direction of the cover 9 and includes a pivot shaft 29 for supporting a read / write head 6 for the disk 5, with the second receiving surface 29a provided at the tip of the pivot shaft 29.

[0072] Therefore, in this embodiment, the pivot shaft 29 to which the cover 9 is fastened can be securely fixed while suppressing tilting. As a result, the stability of the carriage 33's operation ensures the positioning accuracy of the head 6 relative to the disk 5.

[0073] Figure 8 is a cross-sectional view showing the fastening portion between the cover of the recording device according to Embodiment 2 of the present invention and the pivot shaft and voice coil motor of the device body. Figure 9 is a cross-sectional view showing the cover of the recording device of Figure 8 before installation. Embodiment 2 shares the same basic configuration as Embodiment 1, and components identical or corresponding to those in Embodiment 1 are denoted by the same reference numerals, and redundant explanations are omitted. Reference numerals not shown in Figures 8 to 9 refer to Figures 2 and 3.

[0074] The recording device 1 of Example 2 has an inclined fastening surface 23a that fastens to the voice coil motor 35, in addition to the fastening surface 21a that fastens to the pivot shaft 29.

[0075] In other words, the boss portions 21 and 23 of the cover 9 are each provided with fastening surfaces 21a and 23a that are inclined with respect to the contact surface 17a. As shown in Figure 9, the boss portions 21 and 23 are deformed from a right cylindrical shape, and the inner wall surfaces (generatrix of the roughly cylindrical shape) forming the boss portions 21 and 23 are inclined from a direction perpendicular to the cover body 11. The fastening surfaces 21a and 23a are positioned corresponding to the pivot shaft 29 and the second receiving surfaces 29a and 35a of the voice coil motor 35, respectively. In this embodiment, the inclination directions of the fastening surfaces 21a and 23a are opposite.

[0076] When the cover 9 is attached to the device body 2 as shown in Figure 8, it receives a reaction force from the gasket 13 (not shown), similar to Figure 5(B) of Embodiment 1. The gasket 13 is interposed between the cover 9 and the base 7 (not shown), similar to Embodiment 1. The cover body 11, having received the reaction force from the gasket 13, deforms so that it moves away from the boss portions 21 and 23 in a direction perpendicular to the thickness direction, and moves closer to the device body 2 in the thickness direction.

[0077] Due to the inclination of the cover body 11 caused by this deformation, the fastening surfaces 21a and 23a become parallel to or nearly parallel to the second receiving surface 29a of the pivot shaft 29 and the second receiving surface 35a of the voice coil motor 35, respectively. In this state, the fastening surfaces 21a and 23a contact the second receiving surfaces 29a and 35a and are fastened by bolts 31 and 39.

[0078] Therefore, the same effects and advantages as in Example 1 can be achieved in Example 2 as well.

[0079] In the second embodiment, the pivot shaft 29 for supporting the head 6, which is in close proximity to the other, and the voice coil motor 35 for driving the head 6, are fastened to each other by fastening surfaces 21a and 23a that are inclined in opposite directions.

[0080] As a result, the fastening surfaces 21a and 23a, which are inclined in opposite directions, become parallel to or nearly parallel to the contact surface 17a due to the deformation of the cover 9. Therefore, it is possible to reliably prevent the voice coil motor 35 and pivot shaft 29, which are fastened to the fastening surfaces 21a and 23a, from tilting due to the deformation of the cover 9.

[0081] Therefore, it is possible to suppress problems such as deformation or tilting of the pivot shaft 29, and abnormal rotation or misalignment of the carriage 33 that rotates on the pivot shaft 29, as well as deformation or abnormal rotation of the voice coil motor 35.

[0082] Therefore, the operation of the head 6, which is supported by the pivot shaft 29 and driven by the voice coil motor 35, can be made more reliable and stable.

[0083] Figure 10 is a cross-sectional view showing the fastening portion between the cover and the main body of the recording device according to Embodiment 3 of the present invention. Figure 11 is a cross-sectional view showing the state of the recording device cover of Figure 10 before it is attached. Embodiment 3 shares the same basic configuration as Embodiment 1, and components identical or corresponding to those in Embodiment 1 are indicated by the same reference numerals, and redundant explanations are omitted.

[0084] The recording device 1 of Example 3 has an inclined fastening surface 19a that fastens to the spindle shaft 43. The fastening surface 21a that fastens to the pivot shaft 29 and the fastening surface 23a that fastens to the voice coil motor 35 may also be inclined in the same manner as in Example 1 or 2.

[0085] In this embodiment, the cover 9, as shown in Figure 11, has a fastening surface 19a inclined with respect to the contact surface 17a on the boss portion 19. The fastening surface 19a is positioned to correspond to the second receiving surface 43a of the spindle shaft 43.

[0086] As shown in Figure 10, when the cover 9 is attached to the device body 2 (base 7), the cover body 11 deforms due to the reaction force from the gasket 13 (not shown), similar to Figure 5(B) of Embodiment 1, and the boss portion 19 tilts in a direction perpendicular to the thickness direction. The gasket 13 is interposed between the cover 9 and the base 7, similar to Embodiment 1. When the boss portion 19 tilts, the fastening surface 19a becomes parallel to or approaches parallel to the second receiving surface 43a of the spindle shaft 43. In this state, the fastening surface 19a contacts the second receiving surface 43a and is fastened by the bolt 49.

[0087] Therefore, the same effects and advantages as in Example 1 can be achieved in Example 3. Furthermore, in Example 3, by fastening the inclined fastening surface 19a with respect to the spindle shaft 43, the inclination caused by deformation of the cover 9 of the spindle shaft 43 can be reliably suppressed.

[0088] Therefore, it is possible to stabilize the operation by suppressing problems such as deformation of the spindle shaft 43 and abnormal rotation or misalignment of the disk 5 supported by the spindle shaft 43.

[0089] 1 Recording device 5 Disk (recording medium) 7 Base (mating component) 9 Cover 10a First receiving surface 11 Cover body 13 Gasket 17 Fastening part 17a Contact surface 19, 21, 23 Boss parts 19a, 21a, 23a Fastening surface 29 Pivot shaft (shaft, mating component) 29a, 35a, 43a Second receiving surface 35 Voice coil motor (motor, mating component) 43 Spindle shaft (shaft, mating component)

Claims

1. A cover comprising a cover body, a contact surface with respect to a mating member, and a fastening surface with respect to the mating member located on the inside of the contact surface in a plan view, wherein the fastening surface is inclined with respect to the contact surface.

2. A cover according to claim 1, wherein the cover body is concave with respect to the surface of the cover body and convex with respect to the back surface of the cover body, and the tip of the convex part is provided with a boss portion including the fastening surface.

3. A cover according to claim 1, wherein a gasket is provided on the back surface of the cover body.

4. A recording device comprising a cover according to any one of claims 1 to 3 and a device body to which the cover is attached, the recording device comprising: a first receiving surface provided on the device body for receiving the contact surface of the cover; and a second receiving surface provided on the device body for receiving and fastening the fastening surface of the cover.

5. A recording device according to claim 4, wherein the device body has a shaft held along the mounting direction of the cover, and the second receiving surface is provided at the tip of the shaft.

6. A recording device according to claim 5, wherein the shaft is a spindle shaft for supporting a recording medium.

7. A recording device according to claim 5, wherein the shaft is a pivot shaft for supporting a read / write head to a recording medium.

8. A recording device according to claim 7, wherein the device body has a motor that drives the head relative to the pivot shaft, a plurality of the second receiving surfaces are provided on the pivot shaft and the motor, and the fastening surfaces are provided on the cover body at positions corresponding to the second receiving surfaces of the pivot shaft and the motor, respectively.

9. A recording device according to claim 4, wherein the device body has a base which is a housing, and the first receiving surface is provided on the upper surface of the side wall portion of the base.

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