Disk drive

Abstract

To provide a disk device capable of improving the degree of freedom of design.SOLUTION: A disk device according to one embodiment includes a plurality of magnetic disks, a spindle motor, a housing, a first substrate, and a first connector. The magnetic disks are arranged in an axial direction along a first rotation axis. The spindle motor rotates the magnetic disk. The housing has a first wall provided therein with a space housing the magnetic disk and the spindle motor, to which the spindle motor is attached, and a second wall projecting from the first wall and surrounding the space. The first substrate is attached to the outer surface of the second wall facing the outside of the space. The first connector is attached to the first substrate. The diameter of the magnetic disk is 80 mm or more and 100 mm or less. The maximum dimension of the housing in the axial direction is 26.2 mm or more.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] Embodiments of the present invention relate to a disk device.

Background Art

[0002] In a disk device such as a hard disk drive, a plurality of magnetic disks, a spindle motor (SPM), and a head stack assembly (HSA) are housed in a housing. Further, a substrate such as a printed circuit board (PCB) is mounted on the bottom surface of the housing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] With the improvement of the performance of the disk device, the area on the bottom surface of the housing where the substrate can be mounted may decrease, or a large number of electronic components or large-sized electronic components may be mounted on the substrate. In this case, for example, there is a risk that the arrangement of the electronic components on the substrate and the number of magnetic disks are limited.

[0005] An example of the problem to be solved by the present invention is to provide a disk device that can improve the degree of freedom in design.

Means for Solving the Problems

[0006] A disk drive according to one embodiment comprises a plurality of magnetic disks, a spindle motor, a housing, a first substrate, and a first connector. The plurality of magnetic disks are arranged axially along a first rotation axis. The spindle motor is configured to rotate the plurality of magnetic disks around the first rotation axis. The housing has a space inside which the plurality of magnetic disks and the spindle motor are housed, and has a first wall to which the spindle motor is mounted, and a second wall that protrudes from the first wall and surrounds the space. The first substrate is mounted on the outer surface of the second wall facing outwards from the space. The first connector is mounted on the first substrate and is configured to connect to an external device. The diameter of each of the plurality of magnetic disks is 80 mm or more and 100 mm or less. The maximum dimension of the housing in the axial direction is 26.2 mm or more. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is an exemplary perspective view showing an HDD according to the first embodiment. [Figure 2] Figure 2 is an exemplary plan view showing an HDD according to the first embodiment. [Figure 3] Figure 3 is an exemplary perspective view showing a disassembled HDD of the first embodiment. [Figure 4] Figure 4 is an illustrative front view showing a PCBA of the first embodiment. [Figure 5] Figure 5 is an illustrative perspective view showing the PCB and RV sensor of the first embodiment in an exploded state. [Figure 6] Figure 6 is an exemplary perspective view showing an HDD according to the second embodiment. [Figure 7] Figure 7 is an illustrative perspective view showing the PCB and RV sensor in an exploded state according to the third embodiment. [Modes for carrying out the invention]

[0008] (First embodiment) The first embodiment will be described below with reference to Figures 1 to 5. Note that in this specification, the components of the embodiment and their descriptions may be described using multiple expressions. The components and their descriptions are examples and are not limited by the expressions used herein. Components may also be identified by names different from those used herein. Furthermore, components may also be described using expressions different from those used herein.

[0009] Figure 1 is an exemplary perspective view showing a hard disk drive (HDD) 10 according to the first embodiment. The HDD 10 is an example of a disk device and may also be referred to as an electronic device, a storage device, an external storage device, or a magnetic disk device.

[0010] As shown in each drawing, the X, Y, and Z axes are defined herein for convenience. The X, Y, and Z axes are orthogonal to each other. The X axis is provided along the width of the HDD 10. The Y axis is provided along the length of the HDD 10. The Z axis is provided along the thickness of the HDD 10.

[0011] Furthermore, the X, Y, and Z directions are defined herein. The X direction is a direction along the X axis and includes the +X direction indicated by the X-axis arrow and the -X direction which is the opposite direction of the X-axis arrow. The Y direction is a direction along the Y axis and includes the +Y direction indicated by the Y-axis arrow and the -Y direction which is the opposite direction of the Y-axis arrow. The Z direction is a direction along the Z axis and includes the +Z direction indicated by the Z-axis arrow and the -Z direction which is the opposite direction of the Z-axis arrow.

[0012] Figure 2 is an exemplary plan view showing an HDD 10 of the first embodiment. As shown in Figure 2, the HDD 10 includes a housing 11, a relay board 12, a plurality of magnetic disks 13, a spindle motor (SPM) 14, two head stack assemblies (HSAs) 15A, 15B, a voice coil motor (VCM) 16, a ramp load mechanism 17, and two flexible printed circuit boards (FPCs) 18A, 18B.

[0013] The magnetic disk 13 may also be called a platter or media. FPC18A is a first flexible printed circuit board and an example of a flexible printed circuit board. FPC18B is a second example of a flexible printed circuit board.

[0014] Figure 3 is an exemplary perspective view showing a disassembled HDD 10 of the first embodiment. As shown in Figure 3, the housing 11 has a base 21 and a cover 22. Note that the housing 11 is not limited to this example. Also, Figure 2 shows the housing 11 with the cover 22 omitted for illustrative purposes.

[0015] The base 21 and cover 22 are each made of a metallic material, such as an aluminum alloy. However, the materials of the base 21 and cover 22 may be other materials, or may be different from each other.

[0016] As shown in Figure 2, the base 21 is formed in the shape of a roughly rectangular box with an inner chamber S provided inside. The inner chamber S is an example of a space. The inner chamber S is open to the outside of the base 21 in the +Z direction. The magnetic disk 13, SPM 14, HSA 15A, 15B, VCM 16, ramp load mechanism 17, and FPC 18A, 18B are housed in the inner chamber S. The base 21 has a bottom wall 25 and side walls 26. The bottom wall 25 is an example of a first wall. The side walls 26 are an example of a second wall.

[0017] The bottom wall 25 is formed in the shape of a roughly rectangular (quadrilateral) plate extending along the XY plane. The bottom wall 25 has an inner surface 31 as shown in Figure 2 and an outer surface 32 as shown in Figure 3. The inner surface 31 as a whole is oriented roughly in the +Z direction. The inner surface 31 faces the inner chamber S. The outer surface 32 is located on the opposite side of the inner surface 31 and as a whole is oriented roughly in the -Z direction. The outer surface 32 faces the outside of the inner chamber S.

[0018] As shown in FIG. 3, the outer surface 32 has a bottom surface 32a and a concave surface 32b. The bottom surface 32a is provided at the end of the base 21 in the -Z direction. The concave surface 32b is recessed substantially in the +Z direction from the bottom surface 32a. In other words, the concave surface 32b is recessed from the bottom surface 32a toward the inner chamber S.

[0019] The side wall 26 projects substantially in the +Z direction from the edge of the bottom wall 25 and is formed in a substantially rectangular frame shape surrounding the inner chamber S. The bottom wall 25 and the side wall 26 are integrally formed. As shown in FIG. 2, the side wall 26 has an inner surface 35 and an outer surface 36.

[0020] The inner surface 31 of the bottom wall 25 and the inner surface 35 of the side wall 26 form (define, partition) the inner chamber S. That is, the inner surface 35 faces the inner chamber S. The outer surface 36 is located on the opposite side of the inner surface 35. The outer surface 36 faces the outside of the inner chamber S.

[0021] The outer surface 36 has an end surface 36a and a concave surface 36b. The end surface 36a is provided at the end of the base 21 in the -Y direction. The concave surface 36b is recessed substantially in the +Y direction from the end surface 36a. In other words, the concave surface 36b is recessed from the end surface 36a toward the inner chamber S.

[0022] The outer surface 36 further has two side surfaces 36c. The two side surfaces 36c extend substantially in the +Y direction from both ends of the end surface 36a in the X direction. The two side surfaces 36c are formed substantially flat and face the X direction.

[0023] As shown in FIG. 3, a through hole 37, a recess 38, and a plurality of screw holes 39 are provided in the base 21. The through hole 37 is an example of a through hole, a first through hole, and a second through hole. The through hole 37 penetrates the side wall 26 and opens to the concave surface 36b and the inner surface 35. That is, the through hole 37 communicates with the inner chamber S.

[0024] The recess 38 is a notch provided in the outer surface 32 of the bottom wall 25 and the outer surface 36 of the side wall 26. Note that the recess 38 may open only to the outer surface 36 of the side wall 26. The recess 38 does not communicate with the inner chamber S and is separated from the inner chamber S.

[0025] Multiple screw holes 39 are provided on the bottom surface 32a of the bottom wall 25 and on the side surface 36c of the side wall 26. For example, the HDD 10 is fixed to the case or drive bay of an external device, such as a host computer, by screws inserted into the screw holes 39.

[0026] The cover 22 is attached to the end of the side wall 26 in the +Z direction, for example by welding. The cover 22 airtightly seals the inner chamber S. The cover 22 may cover other covers that are attached to the side wall 26, for example by screws.

[0027] The inner chamber S is filled with a gas other than air. For example, a low-density gas with a lower density than air, or a low-reactivity inert gas, is filled into the inner chamber S. In this embodiment, helium is filled into the inner chamber S. Other fluids may also be filled into the inner chamber S.

[0028] The relay board 12 has a printed circuit board (PCB) 41 and two connection connectors 42A and 42B. Connection connector 42A is an example of a second connector and a fourth connector. Connection connector 42B is an example of a third connector.

[0029] The PCB 41 is, for example, attached to the inner surface 35 of the side wall 26, and the through hole 37 is airtightly sealed. For example, the gap between the PCB 41 and the inner surface 35 is sealed with solder, a gasket, or adhesive.

[0030] The two connectors 42A and 42B are arranged approximately in the Z direction. As shown in Figure 2, each of the two connectors 42A and 42B has an inner connector 45 and an outer connector 46.

[0031] The internal connector 45 and external connector 46 are mounted on the PCB 41. The internal connector 45 protrudes from the PCB 41 toward the inner chamber S and is located in the inner chamber S. The two external connectors 46 protrude from the PCB 41 toward the outside of the inner chamber S and are located in the through-holes 37. The internal connector 45 is electrically connected to the external connectors 46.

[0032] Multiple magnetic disks 13 are formed in a disc shape that extends approximately perpendicular to the Z direction. Magnetic recording layers are provided on the upper and lower surfaces of the magnetic disks 13. Multiple magnetic disks 13 are arranged in the Z direction with spacing between them.

[0033] The HDD 10 in this embodiment is a 3.5-inch HDD. The diameter of each of the multiple magnetic disks 13 is set to, for example, 80 mm or more and 100 mm or less. Specifically, the diameter of the magnetic disk 13 is set to approximately 96 mm. The thickness of the multiple magnetic disks 13 is set to approximately 0.635 mm. Note that the dimensions of the magnetic disks 13 are not limited to this example.

[0034] The HDD 10 of this embodiment has 20 magnetic disks 13. Note that the number of magnetic disks 13 is not limited to this example. The housing 11 is formed to be large in the Z direction so that it can accommodate a large number of magnetic disks 13.

[0035] For example, the maximum dimension (thickness) T of the housing 11 in the Z direction shown in Figure 1 is set to 26.2 mm or more. The SFF-8300 form factor for 3.5-inch hard disk drives, formulated by the Small Form Factor Committee, sets multiple maximum dimensions (hereinafter referred to as specified dimensions) for the HDD dimensions in the Z direction. One of the specified dimensions defined in SFF-8300 is 26.10 mm. In other words, the maximum thickness T of the housing 11 in this embodiment is greater than this specified dimension.

[0036] The maximum thickness T of the housing 11 in this embodiment is set to be, for example, longer than 42 mm and 54 mm or less. Specifically, the maximum thickness T of the housing 11 in this embodiment is set to approximately 53.7 mm. Another specified dimension defined in SFF-8300 is 42.00 mm. That is, the maximum thickness T of the housing 11 in this embodiment is greater than that specified dimension.

[0037] The maximum dimensions of the housing 11 in the X and Y directions conform to a single specified dimension defined in SFF-8300. For example, the maximum width of the housing 11 in the X direction is set to 101.85 mm. The maximum length of the housing 11 in the Y direction is set to 146.99 mm.

[0038] The SPM14 is attached to the bottom wall 25. The SPM14 supports multiple magnetic disks 13 stacked with spacing in the Z direction. The multiple magnetic disks 13 are held to the hub of the SPM14, for example, by clamp springs.

[0039] The SPM14 rotates multiple magnetic disks 13 around a central axis Ax1. The central axis Ax1 is an example of a first axis of rotation. The central axis Ax1 is the center of rotation for the magnetic disks 13 and is also the central axis of the hub of the SPM14.

[0040] In this specification, for convenience, the axial, radial, and circumferential directions are defined. The axial direction is the direction along the central axis Ax1. The central axis Ax1 extends in the Z direction. Therefore, the axial direction is equal to the Z direction. The radial direction is the direction perpendicular to the central axis Ax1. The circumferential direction is the direction around the central axis Ax1.

[0041] As shown in Figure 2, the two HSAs 15A and 15B are aligned axially and individually rotatably supported on a support shaft 50. The support shaft 50 is positioned radially away from the magnetic disk 13 and extends, for example, approximately in the +Z direction from the inner surface 31 of the bottom wall 25.

[0042] The two HSA15A and 15B can rotate around a common central axis Ax2, which is spaced apart from the central axis Ax1. Central axis Ax2 is an example of a second axis of rotation. Central axis Ax2 is, for example, the center of rotation of HSA15A and 15B, and is also the central axis of the support axis 50. Central axis Ax2 is positioned approximately parallel to central axis Ax1 and extends in the Z direction.

[0043] Each of the two HSA15A and 15B has a carriage 51 and a plurality of head gimbal assemblies (HGAs) 52. The carriage 51 has an actuator block 55, a plurality of arms 56, and a coil holder 57. The actuator block 55, the plurality of arms 56, and the coil holder 57 are integrally formed.

[0044] The actuator block 55 is rotatably supported on a support shaft 50, for example, via bearings. Multiple arms 56 project from the actuator block 55 substantially parallel to a direction perpendicular to the central axis Ax2. The multiple arms 56 are spaced apart in the Z direction and are able to enter the gaps between the multiple magnetic disks 13.

[0045] The coil holder 57 protrudes from the actuator block 55 and is located on the opposite side of the arm 56. The coil holder 57 holds the voice coil of the VCM16. The VCM16 comprises the voice coil, a pair of yokes, and magnets provided on the yokes.

[0046] Each of the HGA52 is attached to the end portion of one of the arms 56 and protrudes from the arm 56. Each of the HGA52 has a suspension 61 and a magnetic head 62.

[0047] The magnetic head 62 may also be called a slider. The magnetic head 62 of the HSA15A is an example of a first magnetic head. The magnetic head 62 of the HSA15B is an example of a second magnetic head.

[0048] The suspension 61 comprises a base plate 65, a load beam 66, and a flexure 67. The base plate 65 is attached to the end of the arm 56. The load beam 66 is attached to the end of the base plate 65 and protrudes from the base plate 65 in a direction perpendicular to the central axis Ax2.

[0049] The flexia 67 is formed in an elongated strip shape. The flexia 67 is a laminate having, for example, a metal plate (backing layer) such as stainless steel, an insulating layer formed on the metal plate, a conductive layer formed on the insulating layer and constituting a plurality of wirings (wiring patterns), and a protective layer (insulating layer) covering the conductive layer.

[0050] The flexiser 67 is attached to the base plate 65 and the load beam 66. One end of the flexiser 67 is positioned above the load beam 66 and has a displaceable gimbal section (elastic support section).

[0051] The magnetic head 62 is mounted on the gimbal section of the flexi-shape 67. The magnetic head 62 records and plays information on the magnetic disk 13. In other words, the magnetic head 62 reads and writes information to the magnetic disk 13.

[0052] Of the multiple magnetic disks 13, at least one on which the magnetic head 62 of HSA15A reads and writes information is an example of the first magnetic disk. Of the multiple magnetic disks 13, at least one on which the magnetic head 62 of HSA15B reads and writes information is an example of the second magnetic disk.

[0053] The carriage 51 and suspension 61 of HSA15A form actuator AcA. The carriage 51 and suspension 61 of HSA15B form actuator AcB. Actuators AcA and AcB may further have other components. Actuator AcA is an example of a first actuator. Actuator AcB is an example of a second actuator.

[0054] The flexures 67 of actuators AcA and AcB hold the magnetic head 62. Actuators AcA and AcB are aligned axially. Actuators AcA and AcB move the magnetic head 62 by rotating around a common central axis Ax2.

[0055] The VCM16 rotates the HSA15A and 15B around the central axis Ax2 to position them as desired. As the rotation of the HSA15A and 15B by the VCM16 moves the magnetic head 62 to the outermost edge of the magnetic disk 13, the ramp load mechanism 17 holds the magnetic head 62 in a position separated from the magnetic disk 13.

[0056] Each of the two FPCs 18A and 18B has two faces 71 and 72 and a number of curved sections 73. The faces 71 and 72 are located on opposite sides of each other. For example, at one end of the FPCs 18A and 18B, a connector 75 is mounted on face 71 and a reinforcing plate 76 is attached to face 72. The reinforcing plate 76 supports the connector 75 via the FPCs 18A and 18B. The connector 75 is connected to the corresponding inner connector 45 of the two connecting connectors 42A and 42B.

[0057] At the other end of FPC18A,18B, a plurality of pads are provided on the surface 71. These plurality of pads are joined, for example, by solder to one of the two HSA15A,15B flexures 67. In this way, the two FPC18A,18B connect the two HSA15A,15B flexures 67 to the two connection connectors 42A,42B.

[0058] The curved portion 73 is the arc-shaped bent part of the FPC 18A, 18B. The central axis of each arc of the multiple curved portions 73 extends approximately in the Z direction. In this embodiment, the surfaces 71, 72 of the FPC 18A, 18B extend approximately in the Z direction throughout their entire area and do not have any portions perpendicular to the Z direction. Note that the FPC 18A, 18B are not limited to this example, and the surfaces 71, 72 may be bent so that they are perpendicular to the Z direction.

[0059] As shown in Figure 3, the HDD 10 further comprises a PCB assembly (PCBA) 81, a PCB 82, and an FPC 83. PCB 82 is an example of a second substrate. PCBA 81 comprises a PCB 85 and an interface connector (I / F connector) 86. PCB 85 is an example of a first substrate. I / F connector 86 is an example of a first connector.

[0060] PCB85 is formed in a plate shape that extends along the XZ plane. PCB85 is attached to the outer surface 36 of the side wall 26, for example, by screws 89. As shown in Figure 2, PCB85 has an inner surface 91 and an outer surface 92.

[0061] The inner surface 91 is formed to be substantially flat and oriented in the +Y direction. The inner surface 91 of the PCB 85 and the outer surface 36 of the side wall 26 face each other. The inner surface 91 is supported, for example, by the end face 36a. The outer surface 92 is located on the opposite side of the inner surface 91. The outer surface 92 is formed to be substantially flat and oriented in the -Y direction. The inner surface 91 and the outer surface 92 are provided along the axial direction.

[0062] As shown in Figure 3, an opening 93 is provided in the PCB 85. The opening 93 penetrates the PCB 85 in the Y direction and opens to the inner surface 91 and the outer surface 92. The opening 93 is, for example, a notch that opens to the edge of the PCB 85 in the +Z direction. The opening 93 may also be a hole.

[0063] The I / F connector 86 has a main body 95, two mounting parts 96, and a connection terminal 97. The main body 95 is formed in the shape of a rectangular parallelepiped extending substantially in the X direction. A slot 98 is provided in the main body 95. The slot 98 is a recess opening in the -Y direction. The two mounting parts 96 are provided at both ends of the main body 95 in the X direction. The connection terminal 97 is provided in the slot 98 and protrudes from the bottom of the slot 98 in the -Y direction.

[0064] The I / F connector 86 is a connector (port) that conforms to the Serial ATA (SATA) standard or the Serial Attached SCSI (SAS) standard. The I / F connector 86 may conform to both the SATA and SAS standards, or it may conform to other standards. For example, the I / F connector 86 is connected to external devices via data cables and power cables connected to the connection terminal 97.

[0065] The I / F connector 86 is mounted on the PCB 85. For example, the I / F connector 86 is mounted on the inner surface 91 of the PCB 85. Therefore, the I / F connector 86 protrudes from the inner surface 91 in approximately the +Y direction. Furthermore, a mounting portion 96 is positioned between the side wall 26 and the PCB 85. A screw 89 passes through the PCB 85 and the mounting portion 96 and is attached to the side wall 26. In this way, the side wall 26, the PCB 85, ​​and the mounting portion 96 of the I / F connector 86 are fixed to each other.

[0066] The I / F connector 86 is a right-angle connector. That is, the connection terminals 97 extend in the Y direction, which is approximately perpendicular to the inner surface 91 on which the I / F connector 86 is mounted. Therefore, data cables and power cables are inserted into the I / F connector 86 in the +Y direction and removed from the I / F connector 86 in the -Y direction.

[0067] At least a portion of the I / F connector 86 is housed in a recess 38. The recess 38 has a shape, for example, that corresponds to the outer shape of the I / F connector 86. A portion of the side wall 26 forming the recess 38 supports, for example, a mounting portion 96. Of the I / F connector 86, at least the mounting portion 96 is located between the side wall 26 and the PCB 85.

[0068] The slot 98 of the I / F connector 86 is exposed to the outside of the HDD 10 through the opening 93 of the PCB 85. The I / F connector 86 may be partially housed in the opening 93 of the PCB 85.

[0069] The location of I / F connector 86 conforms to the location of the connector on a 3.5-inch device as defined in one of the specifications in SFF-8300. Alternatively, the location of I / F connector 86 may conform to the location of the connector on a 3.5-inch device as defined in the SATA standard. Specifically, the location of I / F connector 86 may conform to section 6.22 Connector locations in SerialATA Revision 3.3 Gold.

[0070] For example, in the X direction, the distance between the connection terminal 97 and the edge of the housing 11 in the +X direction is set to 13.43 mm. In the Y direction, the distance between the connection terminal 97 and the screw hole 39 provided on the bottom surface 32a is set to 36.38 mm. In the Z direction, the distance between the connection terminal 97 and the screw hole 39 provided on the side surface 36c is set to 2.85 mm. The position of the I / F connector 86 may conform to other specifications defined in SFF-8300 or to other revisions of SerialATA.

[0071] PCB82 is attached, for example, to the outer surface 32 of the bottom wall 25 by screws. PCB82 is positioned, for example, inside the concave surface 32b. PCB82 is closer to the cover 22 than the bottom surface 32a of the bottom wall 25. That is, PCB82 does not protrude in the -Z direction from the bottom surface 32a of the bottom wall 25. In this embodiment, PCB82 is smaller than PCB85.

[0072] FPC83 electrically connects, for example, PCB85, PCB82, and SPM14. Note that the FPC or cable connecting PCB85 and PCB82, and the FPC or cable connecting PCB82 and SPM14 may be provided separately.

[0073] Figure 4 is an exemplary front view showing the PCBA81 of the first embodiment. As shown in Figure 4, the PCBA81 further includes two circuits 100A and 100B, two RV sensors 101, and an electronic fuse 102.

[0074] Each of the two circuits, 100A and 100B, includes a read / write connector (R / W connector) 111, a system-on-a-chip (SoC) 112, a DRAM 113, a static reactive power compensation device (SVC) 114, a flash memory (FROM) 115, and a regulator 116. Note that circuits 100A and 100B are not limited to this example. The SoC 112 is an example of a controller.

[0075] The RV sensor 101, electronic fuse 102, R / W connector 111, SoC 112, DRAM 113, SVC 114, FROM 115, and regulator 116 are mounted on the inner surface 91 of PCB 85 and positioned inside the recessed surface 36b. Other electronic components may be further mounted on the inner surface 91 of PCB 85. For example, multilayer ceramic capacitors (MLCCs) or tantalum capacitors may be mounted on the inner surface 91.

[0076] In this embodiment, all electronic components of the PCBA81 are mounted on the inner surface 91. However, at least one of the electronic components of the PCBA81 may be mounted on the outer surface 92. For example, the I / F connector 86 may be mounted on the outer surface 92 and protrude from the outer surface 92.

[0077] The R / W connector 111 of circuit 100A and the R / W connector 111 of circuit 100B are aligned approximately in the Z direction. The R / W connector 111 of circuit 100A is connected to the outer connector 46 of connection connector 42A. The R / W connector 111 of circuit 100B is connected to the outer connector 46 of connection connector 42B. As a result, connection connectors 42A and 42B electrically connect PCB 85 to FPC 18A and 18B.

[0078] The SoC 112 of circuit 100A controls the magnetic head 62 of the HSA 15A through the R / W connector 111, connection connector 42A, FPC 18A, and flexi 67. The SoC 112 of circuit 100B controls the magnetic head 62 of the HSA 15B through the R / W connector 111, connection connector 42B, FPC 18B, and flexi 67. Furthermore, the SoC 112 of either circuit 100A or circuit 100B controls the SPM 14 through the FPC 83. Note that other electronic components may also control the SPM 14.

[0079] In circuits 100A and 100B, the R / W connector 111, SoC 112, DRAM 113, SVC 114, and FROM 115 are arranged in the X direction. The R / W connector 111 is formed in the shape of a rectangular parallelepiped extending in the Z direction. That is, the terminals of the R / W connector 111 are arranged in the Z direction. Therefore, in circuits 100A and 100B, the wiring connecting the terminals of the R / W connector 111 to the other components can be extended in a substantially straight line in the X direction.

[0080] The RV sensor 101 is, for example, a shock sensor or an acceleration sensor. The two RV sensors 101 are spaced apart from each other. For example, one RV sensor 101 is mounted on the edge of the PCB 85 in the +X direction. The other RV sensor 101 is mounted on the edge of the PCB 85 in the -X direction. Note that the position of the RV sensors 101 is not limited to this example.

[0081] Figure 5 is an illustrative perspective view showing the PCB 85 and RV sensor 101 of the first embodiment in an exploded view. As shown in Figure 5, the RV sensor 101 is formed in a substantially rectangular parallelepiped shape and has a bottom surface 101a, two end surfaces 101b and 101c, and two electrodes 101d and 101e.

[0082] The bottom surface 101a is formed to be substantially flat and faces the -Y direction. The bottom surface 101a of the RV sensor 101 and the inner surface 91 of the PCB 85 face each other. The end surface 101b is provided, for example, at the end of the RV sensor 101 in the +X direction. The end surface 101b is formed to be substantially flat and faces the +X direction. The end surface 101c is provided, for example, at the end of the RV sensor 101 in the -X direction. The end surface 101c is formed to be substantially flat and faces the -X direction.

[0083] Electrode 101d is provided on a portion of the bottom surface 101a and the end surface 101b. Electrode 101e is provided on a portion of the bottom surface 101a and the end surface 101c. Note that the positions of electrodes 101d and 101e are not limited to this example. The two electrodes 101d and 101e are spaced apart from each other.

[0084] Two pads 91a and 91b are provided on the inner surface 91 of PCB85. Pad 91a is joined to electrode 101d, for example, via solder. Pad 91b is joined to electrode 101e, for example, via solder. As a result, electrodes 101d and 101e are electrically connected to PCB85.

[0085] The two RV sensors 101 in this embodiment can detect acceleration in the X and Y directions. Therefore, the two RV sensors 101 can detect the acceleration of the HDD 10 in the X direction, the acceleration in the Y direction, and the angular acceleration around the Z axis. The X direction is the direction along the bottom surface 101a and is an example of a first direction. The Y direction is the direction approximately perpendicular to the bottom surface 101a and is an example of a second direction.

[0086] In the HDD 10 according to the first embodiment described above, the housing 11 has a bottom wall 25 to which the SPM 14 is attached, and a side wall 26 that protrudes from the bottom wall 25 and surrounds the inner chamber S. Therefore, the magnetic disks 13 held in the SPM 14 spread out along the bottom wall 25. In addition, the HSAs 15A and 15B for reading and writing information to the magnetic disks 13 and the magnetic disks 13 are arranged along the bottom wall 25. The PCB 85 is attached to the outer surface 36 of the side wall 26 facing outwards from the inner chamber S. The I / F connector 86 is attached to the PCB 85 and is configured to be connected to external devices. That is, the PCB 85 can be used as the main substrate of the HDD 10, with the I / F connector 86 attached. The diameter of each of the multiple magnetic disks 13 is 80 mm or more and 100 mm or less. That is, the HDD 10 is a 3.5-inch HDD. Furthermore, the maximum dimension of the housing 11 in the axial direction is 26.2 mm or more. In other words, the axial dimension of the housing 11 is larger than 26.10 mm, which is one of the specified dimensions defined in SFF-8300. That is, the PCB 85 on which the I / F connector 86 is mounted can be formed to be longer in the axial direction. When the PCB 85 is attached to the outer surface 32 of the bottom wall 25, the size of the PCB 85 is constrained so as not to interfere with components housed in the inner chamber S, such as the magnetic disk 13 and HSA 15A, 15B. However, since the PCB 85 in this embodiment is attached to the outer surface 36 of the side wall 26, even if it is enlarged along the side wall 26, it is less likely to interfere with components housed in the inner chamber S. As a result, the PCB 85 can be formed to the desired size while suppressing interference with components housed in the inner chamber S. Therefore, the HDD 10 in this embodiment can have improved design flexibility.

[0087] In conventional HDDs, the PCB is mounted on the bottom wall of the enclosure. In this case, as mentioned above, the size of the PCB is constrained by the magnetic disks and HSA. Furthermore, the size of the PCB may be constrained to prevent leakage of helium sealed in the enclosure. On the other hand, increasing the number of magnetic disks increases the power consumption of the spindle motor and VCM. In line with the increase in power consumption, the number of MLCCs and tantalum capacitors increases. However, if the area of ​​the PCB or the space around the PCB is limited, it is difficult to add MLCCs or tantalum capacitors. Adding control circuits is also difficult when the HDD is equipped with multiple actuators. The HDD 10 of this embodiment can overcome the conventional limitations described above and improve the degree of design freedom.

[0088] The I / F connector 86 is a connector that conforms to at least one of the SATA and SAS standards. The position of the I / F connector 86 conforms to the position of the connector mounted on a 3.5-inch device as defined in one of the specifications of SFF-8300. As a result, the HDD 10 of this embodiment can be mounted in various devices in place of a typical 3.5-inch HDD conforming to SFF-8300.

[0089] The maximum dimension of the housing 11 in the axial direction is longer than 42 mm and less than or equal to 54 mm. Therefore, the length of the outer surface 36 of the side wall 26 in the axial direction becomes longer, allowing the PCB 85 to be formed to be longer in the axial direction. This allows many electronic components or large electronic components to be mounted on the PCB 85 with ample clearance. Thus, the HDD 10 of this embodiment offers improved design flexibility.

[0090] The number of magnetic disks 13 is 20 or more. Since 20 or more magnetic disks 13 are arranged in the axial direction, the length of the outer surface 36 of the side wall 26 in the axial direction becomes longer. As a result, the PCB 85 can be formed to be long in the axial direction, and many electronic components or large electronic components can be mounted on it. Therefore, the HDD 10 of this embodiment can improve the degree of design freedom.

[0091] The I / F connector 86 is a right-angle connector. This allows the I / F connector 86 to connect to external devices in the Y direction, similar to that of a typical HDD.

[0092] The SoC112 is mounted on PCB85 and configured to control the SPM14. In other words, PCB85 is the main board on which the SoC112 and the I / F connector 86 are mounted. By mounting the main PCB85 to the side wall 26, there is no need to mount other boards on other parts such as the bottom wall 25.

[0093] The I / F connector 86 is located between the side wall 26 and the PCB 85. In other words, the I / F connector 86 does not protrude from the PCB 85. This allows the HDD 10 of this embodiment to be mounted in various devices as a replacement for a typical HDD.

[0094] A recess 38 is provided on the outer surface 36 of the side wall 26 to accommodate the I / F connector 86. This allows the HDD 10 of this embodiment to easily position the I / F connector 86 between the side wall 26 and the PCB 85, ​​and also prevents wasting space inside the enclosure S of the housing 11.

[0095] Actuators AcA and AcB move the magnetic head 62 by rotating around a common central axis Ax2. In other words, the HDD 10 of this embodiment is equipped with multiple actuators. In an HDD equipped with multiple actuators, the number of electronic components mounted on the circuit board increases compared to a typical HDD. In the HDD 10 of this embodiment, the PCB 85 can be formed to the desired size, thus suppressing the design constraints caused by the inclusion of multiple actuators.

[0096] FPC18A and 18B are housed in the inner chamber S. Connection connectors 42A and 42B electrically connect PCB 85 to FPC18A and 18B through through holes 37 provided in the side wall 26. Actuators AcA and AcB are arranged axially. Connection connectors 42A and 42B are also arranged axially. This eliminates the need for FPC18A to be connected to connection connector 42B via FPC18B or to cross FPC18B. Therefore, the structure of FPC18A and 18B can be simplified and they can be standardized.

[0097] FPC18A and 18B are housed in the inner chamber S. Connection connectors 42A and 42B electrically connect the PCB 85 and FPC18A and 18B through through holes 37 provided in the side wall 26. In a typical HDD, the connection connectors penetrate the bottom wall 25, so FPC18A and 18B are bent along the bottom wall 25. However, in this embodiment, FPC18A and 18B do not need to be bent along the bottom wall 25. That is, the portion of FPC18A and 18B that is bent is unnecessary. As a result, FPC18A and 18B can be made smaller, and parts such as reinforcing plates that hold FPC18A and 18B along the bottom wall 25 can be omitted. Therefore, the HDD 10 of this embodiment can reduce costs. In addition, the HDD 10 can increase the space in the inner chamber S where other components can be placed.

[0098] The RV sensor 101 has a bottom surface 101a facing the PCB 85, ​​and electrodes 101d and 101e provided on the bottom surface 101a and electrically connected to the PCB 85. Generally, shock sensors that detect acceleration detect acceleration in two directions along the bottom surface 101a. However, the RV sensor 101 of this embodiment can detect acceleration in the X direction along the bottom surface 101a and in the Y direction perpendicular to the bottom surface 101a. As a result, the RV sensor 101 can detect acceleration in the same way as when a PCB is attached to the outer surface 32 of the bottom wall 25 and a general shock sensor is mounted on the PCB.

[0099] PCB82 is attached to the outer surface 32 of the bottom wall 25 facing the outside of the inner chamber S. This allows many electronic components or large electronic components to be distributed and mounted on PCB85 and PCB82. Therefore, the HDD10 of this embodiment can have improved design flexibility.

[0100] (Second embodiment) A second embodiment will be described below with reference to Figure 6. In the following descriptions of multiple embodiments, components having the same function as those already described will be denoted by the same reference numerals as those previously described, and their descriptions may be omitted. Furthermore, multiple components denoted by the same reference numerals do not necessarily share all functions and properties; they may have different functions and properties depending on the embodiment.

[0101] Figure 6 is an exemplary perspective view showing an HDD 10 according to a second embodiment. As shown in Figure 6, the HDD 10 of the second embodiment has a composite substrate 200 instead of PCBs 82 and 85. The composite substrate 200 is an example of the first substrate. The composite substrate 200 is substantially equivalent to PCB 85, ​​except as described below.

[0102] The composite substrate 200 is a flex-rigid wiring board or a rigid-flexible substrate. The composite substrate 200 has two rigid parts 201 and 202 and a flexible part 203. Rigid part 201 is an example of a first part. Rigid part 202 is an example of a second part. Flexible part 203 is an example of a third part.

[0103] The flexible portion 203 is formed by an FPC (flexible printed circuit board). Therefore, the flexible portion 203 is pliable. On the other hand, the rigid portions 201 and 202 are formed by the FPC that forms the flexible portion 203 and a PCB (printed board) joined to the FPC. Note that the rigid portions 201, 202 and the flexible portion 203 are not limited to this example.

[0104] The rigid parts 201 and 202 have higher rigidity than the flexible part 203. The two rigid parts 201 and 202 are spaced apart from each other. The flexible part 203 is provided between the rigid parts 201 and 202 and electrically connects the two rigid parts 201 and 202.

[0105] The rigid portion 201 is attached to the outer surface 32 of the bottom wall 25, similar to the PCB 82 in the first embodiment. On the other hand, the rigid portion 202 is attached to the outer surface 36 of the side wall 26, similar to the PCB 85 in the first embodiment.

[0106] The I / F connector 86, RV sensor 101, electronic fuse 102, R / W connector 111, SoC 112, DRAM 113, SVC 114, FROM 115, and regulator 116 are mounted on the rigid section 202. Alternatively, at least one of the RV sensor 101, electronic fuse 102, R / W connector 111, SoC 112, DRAM 113, SVC 114, FROM 115, and regulator 116 may be mounted on the rigid section 201.

[0107] In the HDD 10 of the second embodiment described above, the composite substrate 200 has rigid parts 201 and 202 and a flexible part 203. The rigid part 201 is attached to the outer surface 32 of the bottom wall 25 facing the outside of the inner chamber S. The rigid part 202 is attached to the outer surface 36 of the side wall 26. The flexible part 203 is provided between the rigid part 201 and the rigid part 202 and is flexible. As a result, many electronic components or large electronic components can be distributed and mounted on the rigid parts 201 and 202. Therefore, the HDD 10 of the second embodiment can be made more flexible in design.

[0108] (Third embodiment) A third embodiment will be described below with reference to Figure 7. Figure 7 is an exemplary perspective view showing the PCB 85 and RV sensor 301 in an exploded view according to the third embodiment. As shown in Figure 7, the PCB 81 of the third embodiment has an RV sensor 301 instead of an RV sensor 101. The RV sensor 301 is substantially equivalent to the RV sensor 101, except as described below.

[0109] The bottom surface 101a of the RV sensor 301 extends, for example, along the XY plane and is oriented approximately in the +Z direction. The RV sensor 301 further has a side surface 301a. The side surface 301a intersects with the bottom surface 101a. The side surface 301a is formed approximately flat and is oriented in the -Y direction. The side surface 301a of the RV sensor 301 and the inner surface 91 of the PCB 85 face each other.

[0110] Electrodes 101d and 101e are provided on the bottom surface 101a and the end surfaces 101b and 101c, but not on the side surface 301a. In other words, electrodes 101d and 101e are spaced apart from the side surface 301a.

[0111] Pad 91a is joined to electrode 101d on end face 101b, for example, via solder. Pad 91b is joined to electrode 101e on end face 101c, for example, via solder. In this way, electrodes 101d and 101e can be electrically connected to PCB 85 even if the bottom surface 101a and the inner surface 91 of PCB 85 are not facing each other.

[0112] The RV sensor 101 of this embodiment can detect acceleration in the X and Y directions. The X and Y directions are directions along the bottom surface 101a, and are examples of two directions along the bottom surface.

[0113] In the HDD 10 of the third embodiment described above, the RV sensor 301 has a bottom surface 101a, a side surface 301a, and electrodes 101d and 101e. The side surface 301a intersects with the bottom surface 101a. The electrodes 101d and 101e are provided on the bottom surface 101a and spaced apart from the side surface 301a, and are electrically connected to the PCB 85. The RV sensor 301 can detect acceleration in two directions along the bottom surface 101a. Generally, the bottom surface 101a on which the electrodes 101d and 101e are provided faces the substrate (PCB 85) on which the RV sensor 301 is mounted. However, in the RV sensor 301 of this embodiment, the side surface 301a faces the PCB 85. As a result, the RV sensor 301 can detect acceleration in the same way as when the PCB 85 is attached to the outer surface 32 of the bottom wall 25 and a general shock sensor is mounted on the PCB 85.

[0114] In the embodiments described above, the I / F connector 86 is a right-angle connector. However, the I / F connector 86 may also be a conventional connector in which the connection terminals 97 extend in a direction along the inner surface 91 on which the I / F connector 86 is mounted.

[0115] Furthermore, in the above embodiments, the PCB 82 and the rigid portion 201 are attached to the outer surface 32 of the bottom wall 25. However, the PCB 82 and the rigid portion 201 may also be attached to other parts of the housing 11, such as the side surface 36c of the side wall 26.

[0116] In the above explanation, "suppress" is defined, for example, as preventing the occurrence of an event, effect, or influence, or reducing the degree of an event, effect, or influence.

[0117] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of Symbols]

[0118] 10...Hard disk drive (HDD), 11...Enclosure, 13...Magnetic disk, 14...Spindle motor (SPM), 18A,18B...Flexible printed circuit board (FPC), 25...Bottom wall, 26...Side wall, 32,36...Outer surface, 37...Through hole, 38...Recess, 42A,42B...Connecting connector, 62...Magnetic head, 82,85...Printed circuit board (PCB), 86...Interface connector (I / F connector), 101,301...RV sensor, 101a...Bottom surface, 101d,101e...Electrodes, 112...System-on-a-chip (SoC), 200...Composite substrate, 201,202...Rigid part, 203...Flexible part, 301a...Side, S...Inner chamber, Ax1,Ax2...Central axis, AcA,AcB...Actuator, T...Dimensions.

Claims

1. Multiple magnetic disks arranged in the axial direction along the first axis of rotation, A spindle motor and A housing is provided with a space inside which the plurality of magnetic disks and the spindle motor are housed, and has a first wall to which the spindle motor is mounted, and a second wall that protrudes from the first wall and surrounds the space, A first substrate is attached to the outer surface of the second wall facing outwards from the space, A first connector, which is mounted on the first substrate and configured to be connected to an external device, It is equipped with, The diameter of each of the aforementioned plurality of magnetic disks is 80 mm or more and 100 mm or less. The maximum dimension of the housing in the axial direction is 26.2 mm or more. Disk drive.

2. The first connector is a connector that conforms to at least one of the Serial ATA standard and the Serial Attached SCSI standard. The position of the first connector is in accordance with the position of a connector mounted on a 3.5-inch device as defined in one of the standards in SFF-8300. The disk device according to claim 1.

3. The maximum dimension of the housing in the axial direction is longer than 42 mm and less than or equal to 54 mm. The disk device according to claim 1.

4. The number of the aforementioned magnetic disks is 20 or more. The disk device according to claim 1.

5. The first connector described above is a right-angle connector. The disk device according to claim 1.

6. A controller, mounted on the first substrate and configured to control the spindle motor, A disk device according to claim 1, further comprising:

7. The first connector is located between the second wall and the first substrate. A disk drive according to any one of claims 1 to 6.

8. A recess is provided on the outer surface of the second wall for housing the first connector. The disk device according to claim 7.

9. A first magnetic head configured to read and write information to a first magnetic disk included in the plurality of magnetic disks, A first actuator is configured to hold the first magnetic head and move the first magnetic head by rotating around a second rotation axis, A second magnetic head configured to read and write information to a second magnetic disk included in the plurality of magnetic disks, A second actuator is configured to hold the second magnetic head and move the second magnetic head by rotating around the second rotation axis, A disk device further comprising any one of claims 1 to 6.

10. A first flexible printed circuit board housed in the aforementioned space, A second flexible printed circuit board housed in the aforementioned space, A second connector electrically connects the first substrate and the first flexible printed circuit board through a first through-hole provided in the second wall, A third connector electrically connects the first substrate and the second flexible printed circuit board through a second through-hole provided in the second wall, Furthermore, it is equipped with, The first actuator and the second actuator are arranged in the axial direction, The second connector and the third connector are arranged in the axial direction. The disk device according to claim 9.

11. A flexible printed circuit board housed in the aforementioned space, A fourth connector electrically connects the first substrate and the flexible printed circuit board through a through-hole provided in the second wall, A disk device comprising any one of claims 1 to 6.

12. A sensor having a bottom surface facing the first substrate, and electrodes provided on the bottom surface and electrically connected to the first substrate, capable of detecting acceleration in a first direction along the bottom surface and a second direction perpendicular to the bottom surface, A disk device further comprising any one of claims 1 to 6.

13. A sensor having a bottom surface, a side surface intersecting the bottom surface and facing the first substrate, and an electrode provided on the bottom surface, spaced apart from the side surface and electrically connected to the first substrate, capable of detecting acceleration in two directions along the bottom surface, A disk device further comprising any one of claims 1 to 6.

14. A second substrate is attached to the outer surface of the first wall facing outwards from the space, A disk device further comprising any one of claims 1 to 6.

15. The first substrate has a first portion attached to the outer surface of the first wall facing outward from the space, a second portion attached to the outer surface of the second wall, and a flexible third portion provided between the first portion and the second portion. A disk drive according to any one of claims 1 to 6.

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