Disk device

Abstract

The present disclosure provides a disk device capable of suppressing contact between a flexible member and a magnetic disk. A disk device according to an embodiment includes a carriage, a magnetic disk, a base plate, a load beam, a flexible member, and a magnetic head. The carriage rotates around a first rotating shaft. The base plate has a first surface facing the magnetic disk, and is attached to the carriage. The load beam is installed on the base body plate. The flexible member has a plurality of wires and is mounted on the base plate and the load beam. The magnetic head is attached to the flexible member and is electrically connected to at least one of the plurality of wirings. The flexible member has a thin portion that is thinner than another portion of the flexible member. The thin portion has a first portion covering the first surface and extending non-parallel to the plurality of wirings.

Description

[0001] This application claims the priority of Japanese Patent Application No. 2023-156636 (filing date: September 22, 2023) as a basic application. The present application incorporates the entire contents of the basic application by reference. Technical Field

[0002] An embodiment of the present invention relates to a disk device. Background Art

[0003] A disk device such as a hard disk drive (HDD) has a magnetic disk and a head stack assembly (HSA). The HSA has a rotating carriage, a base plate mounted on an arm of the carriage, a load beam extending from the base plate, a flexure mounted on the load beam, and a magnetic head mounted on the flexure.

[0004] The HSA moves the magnetic head to a desired position on the magnetic disk, and reads and writes information on the magnetic disk through the magnetic head. The wiring of the flexure transmits, for example, a write signal input to the magnetic head and a read signal output from the magnetic head.

[0005] The flexure is located near the magnetic disk. Therefore, when, for example, shock or vibration acts on the disk device, there is a possibility that the flexure comes into contact with the magnetic disk. Summary of the invention

[0006] An embodiment of the present invention provides a disk device capable of suppressing contact between a flexure and a magnetic disk.

[0007] The disk device involved in this embodiment includes a slide, a magnetic disk, a base plate, a load beam, a flexure and a magnetic head. The slide is configured to rotate around a first rotation axis. The base plate has a first surface configured to face the magnetic disk and is mounted on the slide. The load beam is mounted on the base plate. The flexure has a plurality of wirings, which are mounted on the base plate and the load beam. The magnetic head is mounted on the flexure, is electrically connected to at least one of the plurality of wirings, and is configured to read and write information to the magnetic disk. The flexure has a thin portion that is thinner than another portion of the flexure. The thin portion has a first portion that covers the first surface and at least two of the plurality of wirings extend non-parallel. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is an exemplary perspective view showing the HDD according to the first embodiment in an exploded manner.

[0009] Figure 2 It is an exemplary plan view partially showing the HGA and the arm according to the first embodiment.

[0010] Figure 3 It is along Figure 2An exemplary cross-sectional view schematically shows the HGA and a part of the arm according to the first embodiment, taken along line F3 - F3 .

[0011] Figure 4 This is an exemplary plan view showing a part of the HGA according to the first embodiment.

[0012] Figure 5 This is an exemplary cross-sectional view schematically showing a portion of the HGA and the arm to which impact or vibration is applied according to the first embodiment.

[0013] Figure 6 It is an exemplary plan view partially showing the HGA and the arm according to the second embodiment.

[0014] Figure 7 It is along Figure 6 An exemplary cross-sectional view schematically shows the HGA and a part of the arm according to the second embodiment, taken along line F7-F7.

[0015] Figure 8 This is an exemplary cross-sectional view schematically showing a portion of the HGA and the arm to which an impact or vibration is applied according to the second embodiment.

[0016] Description of symbols

[0017] 10…HDD, 12…disk, 35…slide, 51…head, 55…base plate, 56…load beam, 56b…outer surface, 56c…edge, 57…flexure, 61b…outer surface, 91…lining layer, 92…base layer, 95…wiring, 95W…write wiring, 95R…read wiring, 101, 102, 201…thick portion, 103, 202, 203…thin portion, 103a, 103b…end portion, 105…first portion, 106…second portion, 107…third portion, 108…hole, 109…welding portion, 202a, 202b…end portion, Axd, Axh…center axis. DETAILED DESCRIPTION

[0018] (First embodiment)

[0019] Below, refer to Figures 1 to 5 , the first embodiment is described. In addition, in this specification, sometimes the constituent elements involved in the embodiment and the description of the element are recorded in multiple expressions. The constituent elements and their descriptions are just examples and are not limited by the descriptions in this specification. The constituent elements can also be identified by names different from the names in this specification. In addition, the constituent elements can also be described by expressions different from the descriptions in this specification.

[0020] In the following description, "suppress" is defined as, for example, preventing an event, action, or influence from occurring, or reducing the degree of an event, action, or influence. In addition, in the following description, "restrict" is defined as, for example, preventing movement or rotation, or allowing movement or rotation within a predetermined range and preventing movement or rotation beyond the predetermined range.

[0021] Figure 1 This is an illustrative stereoscopic diagram showing a hard disk drive (HDD) 10 according to the first embodiment in an exploded manner. The HDD 10 is an example of a disk device, and can also be referred to as an electronic device, a storage device, an external storage device, or a magnetic disk device. The HDD 10 of this embodiment is a so-called 3.5-inch HDD. In addition, the HDD 10 is not limited to this example.

[0022] like Figure 1 As shown, HDD 10 has housing 11, multiple magnetic disks 12, spindle motor 13, head stack assembly (HSA) 14, voice coil motor (VCM) 15, ramp loading mechanism 16 and printed circuit board (PCB) 17. Magnetic disk 12 can also be called disk or platter.

[0023] like Figure 1 As shown, in this specification, for convenience, a Z axis and a Z direction are defined. The Z axis is set along the thickness of the HDD 10. The Z direction is a direction along the Z axis, including a +Z direction indicated by an arrow of the Z axis and a -Z direction which is the opposite direction of the arrow of the Z axis.

[0024] The housing 11 includes a base 21, an inner cover 22, and an outer cover 23. The housing 11 is not limited to this example. The base 21, the inner cover 22, and the outer cover 23 are each made of a metal material such as an aluminum alloy. The materials of the base 21, the inner cover 22, and the outer cover 23 may be different from each other.

[0025] The base 21 is formed in a substantially rectangular box shape that is open in the +Z direction. The base 21 accommodates the plurality of magnetic disks 12 , the spindle motor 13 , the HSA 14 , the VCM 15 , and the ramp load mechanism 16 .

[0026] The base 21 has a bottom wall 25 and a side wall 26. The bottom wall 25 is formed in a substantially rectangular (quadrilateral) plate shape extending in a manner substantially orthogonal to the Z direction. The side wall 26 protrudes from the edge of the bottom wall 25 in the substantially +Z direction and is formed in a substantially rectangular frame shape. The bottom wall 25 and the side wall 26 are formed integrally.

[0027] The inner cover 22 is mounted on the end of the side wall 26 in the +Z direction, for example, by screws, to close the base 21. The outer cover 23 covers the inner cover 22 and is mounted on the end of the side wall 26 in the +Z direction, for example, by welding.

[0028] The inner cover 22 is provided with a vent 27. Furthermore, the outer cover 23 is provided with a vent 28. After the components are mounted inside the base 21 and the inner cover 22 and the outer cover 23 are mounted on the base 21, the air inside the housing 11 is extracted from the vents 27 and 28. Furthermore, the inside of the housing 11 is filled with a gas different from air.

[0029] The gas filled in the shell 11 is, for example, a low-density gas having a lower density than air, an inert gas having low reactivity, etc. For example, helium gas is filled in the shell 11. In addition, other fluids may be filled in the shell 11. In addition, the inside of the shell 11 may be maintained at a vacuum, a low pressure close to a vacuum, or a negative pressure lower than the atmospheric pressure.

[0030] The vent 28 of the outer cover 23 is closed by a seal 29. The seal 29 seals the vent 28 airtightly, and restricts leakage of the fluid filling the interior of the housing 11 from the vent 28 to the outside of the housing 11.

[0031] The plurality of magnetic disks 12 are formed in a disk shape extending perpendicularly to the Z direction. The plurality of magnetic disks 12 are overlapped with a gap in the Z direction. Each of the plurality of magnetic disks 12 has, for example, at least one recording surface 12a and an outer edge 12b.

[0032] The plurality of recording surfaces 12a are surfaces of the magnetic disk 12 facing substantially in the +Z direction or surfaces of the magnetic disk 12 facing substantially in the -Z direction. The recording surface 12a is a substantially flat surface perpendicular to the Z direction. The magnetic recording layer of the magnetic disk 12 is provided on the recording surface 12a.

[0033] The outer edge 12b is an end (outer periphery) of the magnetic disk 12 farthest from the central axis Axd of the magnetic disk 12. The central axis Axd is an example of a second rotation axis and is a virtual axis extending substantially in the Z direction.

[0034] The spindle motor 13 supports the plurality of magnetic disks 12 and rotates the magnetic disks about a central axis Axd. The central axis Axd is also the central axis of the spindle motor 13. The plurality of magnetic disks 12 are held on a hub of the spindle motor 13 by, for example, a clamp spring.

[0035] The housing 11 is provided with a support shaft 31 spaced apart from the magnetic disk 12 in a direction perpendicular to the central axis Axd. The support shaft 31 extends, for example, substantially in the +Z direction from the bottom wall 25 of the housing 11. The HSA 14 is rotatably supported by the support shaft 31.

[0036] The HSA 14 can rotate around the central axis Axh. The central axis Axh is an example of the first rotation axis and is an imaginary axis extending substantially in the Z direction. The central axis Axh is, for example, the center of rotation of the HSA 14 and is also the central axis of the support shaft 31. Therefore, the central axis Axh is spaced apart from the central axis Axd of the magnetic disk 12 in a direction orthogonal to the central axis Axd.

[0037] For convenience, the following defines axial, radial, and circumferential directions. The axial direction is the direction along the central axis Axh. The axial direction is equal to the Z direction. The radial direction is the direction orthogonal to the central axis Axh, including multiple directions orthogonal to the central axis Axh. The circumferential direction is the direction of rotation around the central axis Axh, including the direction of clockwise rotation and the direction of counterclockwise rotation around the central axis Axh.

[0038] The HSA 14 has a carriage 35 , a plurality of head gimbal assemblies (HGAs) 36 , and a flexible printed circuit board (FPC) 37 . The carriage 35 has an actuator block 41 , a plurality of arms 42 , and a coil holder 43 .

[0039] The actuator block 41, the plurality of arms 42, and the coil holder 43 are integrally formed of, for example, aluminum. In addition, the materials of the actuator block 41, the arms 42, and the coil holder 43 are not limited to this example.

[0040] The actuator block 41 is supported by the support shaft 31 via a bearing so as to be rotatable around the central axis Axh, for example. Thereby, the carriage 35 is rotatable around the central axis Axh.

[0041] The plurality of arms 42 protrude in the radial direction from the actuator block 41. Alternatively, the HSA 14 may be divided so that the arms 42 protrude from each of the plurality of actuator blocks 41.

[0042] Figure 2 FIG. 4 is an exemplary top view partially showing the HGA 36 and the arm 42 of the first embodiment. Figure 2 As shown, in this specification, for convenience, an X-axis and a Y-axis are further defined. The X-axis, the Y-axis, and the Z-axis are orthogonal to each other. The Y-axis is provided along the arm 42. Moreover, in this specification, an X direction and a Y direction are further defined. The X direction is a direction along the X-axis, including the +X direction indicated by the arrow of the X-axis and the -X direction which is the opposite direction of the arrow of the X-axis. The Y direction is a direction along the Y-axis, including the +Y direction indicated by the arrow of the Y-axis and the -Y direction which is the opposite direction of the arrow of the Y-axis.

[0043] The plurality of arms 42 protrude from the actuator block 41 in the +Y direction. Therefore, the Y direction is the long side direction of the arm 42. In addition, the Y direction is included in the radial direction. The X direction is the short side direction of the arm 42. The X direction and the Y direction change as the carriage 35 rotates around the central axis Axh.

[0044] The arms 42 are arranged at intervals in the axial direction. Each of the arms 42 is formed in a plate shape that can enter the gap between the adjacent magnetic disks 12. The arms 42 extend substantially in parallel.

[0045] Figure 1 The coil holder 43 protrudes in the -Y direction from the actuator block 41. The coil holder 43 holds the voice coil of the VCM 15. The VCM 15 includes the voice coil, a pair of yokes, and a magnet provided on the yokes.

[0046] Figure 3 It is along Figure 2 F3-F3 schematically shows an exemplary cross-sectional view of a portion of the HGA 36 and the arm 42 of the first embodiment. Figure 3 As shown, each of the plurality of arms 42 has two seat surfaces 42a.

[0047] The seat surface 42a is provided at the end of the arm 42 in the +Y direction. The two seat surfaces 42a are located on opposite sides. One seat surface 42a is formed to be substantially flat and faces substantially in the +Z direction. The other seat surface 42a is formed to be substantially flat and faces substantially in the -Z direction.

[0048] like Figure 2 As shown, each of the plurality of arms 42 further has an inner side surface 42b and an outer side surface 42c. The inner side surface 42b faces approximately in the +X direction. Moreover, the inner side surface 42b faces the central axis Axd. The outer side surface 42c is located on the opposite side of the inner side surface 42b. The outer side surface 42c faces approximately in the -X direction.

[0049] Each of the plurality of arms 42 is provided with a rivet hole 45 and a slit 46. The rivet hole 45 is a circular hole that penetrates the arm 42 in the approximate Z direction in a manner that is open at the two seat surfaces 42a. The slit 46 is open at the outer side surface 42c and extends along the outer side surface 42c in the approximate Y direction. The slit 46 is closer to the central axis Axh than the rivet hole 45.

[0050] Each of the plurality of HGAs 36 is mounted on the seat surface 42a of the arm 42 so as to protrude from the arm 42 in the substantially +Y direction. Thus, the plurality of HGAs 36 are arranged at intervals in the Z direction. In addition, for ease of understanding, the following description mainly describes one HGA 36 mounted on the seat surface 42a facing the -Z direction. Figure 2 As shown in the following drawings, the HGA 36 mounted on the seat surface 42 a facing the +Z direction is formed substantially in mirror symmetry with respect to the HGA 36 mounted on the seat surface 42 a facing the −Z direction.

[0051] Each of the plurality of HGAs 36 includes a magnetic head 51 and a suspension 52. The magnetic head 51 can also be called a slider. The magnetic head 51 records and reproduces information on a corresponding one of the recording surfaces 12a of the plurality of magnetic disks 12. In other words, the magnetic head 51 reads and writes information on the magnetic disk 12.

[0052] The carriage 35 rotates about the center axis Axh to move the magnetic head 51 relative to the corresponding magnetic disk 12. The VCM 15 moves the magnetic head 51 to a desired position along the recording surface 12a of the magnetic disk 12 by rotating the carriage 35 about the center axis Axh.

[0053] When the head 51 moves to the outer edge 12b of the magnetic disk 12 by the rotation of the HSA 14 realized by the VCM 15, Figure 1 The ramp loading mechanism 16 holds the magnetic head 51 in a position spaced apart from the magnetic disk 12 .

[0054] The magnetic disk 12 is spaced apart from the arm 42 in the Z direction. When the magnetic head 51 is located above the recording surface 12a of the magnetic disk 12, the seat surface 42a faces the magnetic disk 12.

[0055] The suspension 52 is attached to the arm 42 and holds the magnetic head 51. The suspension 52 includes a base plate 55, a load beam 56, and a flexure 57.

[0056] The base plate 55 and the load beam 56 are made of, for example, stainless steel. The materials of the base plate 55 and the load beam 56 are not limited to this example. The base plate 55 and the load beam 56 may be made of different materials.

[0057] The base plate 55 has a plate 61 and a boss 62. The plate 61 is formed into a substantially quadrilateral plate shape substantially orthogonal to the Z direction. Figure 3 As shown, the plate 61 has an inner surface 61a and an outer surface 61b. The outer surface 61b is an example of a first surface.

[0058] The inner surface 61a is formed to be approximately flat and faces approximately the +Z direction. The inner surface 61a and the seat surface 42a of the arm 42 face each other and contact each other. The outer surface 61b is located on the opposite side of the inner surface 61a. The outer surface 61b is formed to be approximately flat and faces approximately the -Z direction. When the magnetic head 51 is located on the recording surface 12a of the magnetic disk 12, the outer surface 61b faces the recording surface 12a of the corresponding magnetic disk 12.

[0059] The boss 62 protrudes from the inner surface 61a. The boss 62 is formed in a substantially cylindrical shape and is inserted into the rivet hole 45 of the arm 42. The base plate 55 is attached to the arm 42 of the carriage 35 by riveting the boss 62 and the arm 42. In addition, the base plate 55 may be attached to the arm 42 by other methods.

[0060] The load beam 56 is formed in a plate shape thinner than the base plate 55. The load beam 56 has two base protrusions 71, a beam 72, two side rails 73, and a lifting protrusion 74.

[0061] like Figure 2 As shown, the two base tabs 71 are spaced apart from the boss 62 in the Y direction and in the +Y direction. The two base tabs 71 are spaced apart from each other in the X direction. The base tabs 71 are fixed to the outer surface 61b of the plate 61 by, for example, spot welding. Thus, the load beam 56 is mounted on the base plate 55. In addition, the base tabs 71 can also be mounted on the plate 61 by other means.

[0062] The beam 72 extends from the ends of the two base protrusions 71 in the +Y direction substantially in the +Y direction. Figure 3 As shown, the beam 72 extends obliquely from the base tab 71 toward the corresponding magnetic disk 12. For example, the beam 72 extends from the base tab 71 in an oblique direction between the +Y direction and the -Z direction.

[0063] The load beam 56 further includes an inner surface 56 a and an outer surface 56 b . The outer surface 56 b is an example of a second surface. The inner surface 56 a and the outer surface 56 b are surfaces of the load beam 56 provided on the base protrusion 71 and the beam 72 .

[0064] The inner surface 56a faces approximately in the +Z direction. The inner surface 56a of the base protrusion 71 contacts the outer surface 61b of the plate 61. The outer surface 56b is located on the opposite side of the inner surface 56a and faces approximately in the -Z direction. When the magnetic head 51 is located on the recording surface 12a of the magnetic disk 12, the outer surface 56b faces the corresponding recording surface 12a of the magnetic disk 12.

[0065] like Figure 2 As shown, the load beam 56 has an edge 56c of the outer surface 56b. The edge 56c is located at the end of the outer surface 56b in the -Y direction. The edge 56c is located between the two base tabs 71. That is, the edge 56c is provided at the end of the outer surface 56b in the -Y direction in the beam 72.

[0066] In the present embodiment, the edge 56c is spaced apart from the base plate 55 in the +Y direction. Therefore, a through hole 76 is provided between the edge 56c in the Y direction and the base plate 55 and between the two base protruding pieces 71 in the X direction.

[0067] The through hole 76 may be omitted. For example, the through hole 76 may be omitted by positioning the edge 56c on the base plate 55. Alternatively, the through hole 76 may be omitted by providing the load beam 56 with one base protrusion 71 positioned substantially at the center of the base plate 55 in the X direction.

[0068] The two side rails 73 protrude from both ends of the beam 72 in the X direction in a substantially +Z direction. Figure 3 As shown, the side rails 73 protrude from the inner surface 56a of the beam 72. The two side rails 73 extend along both ends of the beam 72 in the X direction and extend in the general Y direction.

[0069] The lifting and lowering tab 74 is provided at the end portion in the +Y direction of the beam 72. When the ramp load mechanism 16 holds the magnetic head 51, the lifting and lowering tab 74 is supported by the ramp load mechanism 16.

[0070] The flexible member 57 is a flexible printed wiring board formed in the shape of an elongated strip. Figure 2 As shown, the flexible member 57 has, for example, a main body 81 and a suspension tail 82 .

[0071] The body 81 partially covers the plate 61 and the beam 72. For example, the body 81 partially covers the outer surface 61b of the plate 61 and the outer surface 56b of the load beam 56 in the beam 72. The body 81 is attached to the outer surfaces 56b and 61b by spot welding, for example.

[0072] A gimbal portion 85 is provided at the end portion in the +Y direction of the main body 81. The magnetic head 51 is mounted on the gimbal portion 85. The gimbal portion 85 includes, for example, a frame-shaped portion mounted on the beam 72, and a portion on which the magnetic head 51 is mounted and which can be elastically displaced relative to the frame-shaped portion. In addition, the gimbal portion 85 is not limited to this example.

[0073] The suspension tail 82 extends from the end of the body 81 in the -Y direction toward the actuator block 41. The end of the suspension tail 82 in the -Y direction is connected to one end of the FPC 37 attached to the actuator block 41. The other end of the FPC 37 is connected to a connector provided on the bottom wall 25, for example.

[0074] The suspension tail 82 has an inner extension 86, an outer extension 87, and a protrusion 88. The inner extension 86 is accommodated in the slit 46. The outer extension 87 is located between the body 81 and the inner extension 86. The outer extension 87 is located outside the slit 46 and is farther from the central axis Axd than the base plate 55.

[0075] like Figure 3 As shown, the inner extension portion 86 is farther from the corresponding magnetic disk 12 than the base plate 55 in the Z direction. At least a portion of the outer extension portion 87 is located between the base plate 55 and the corresponding magnetic disk 12 in the Z direction.

[0076] like Figure 2 As shown, the protrusion 88 extends from the outer extension portion 87 in the substantially +X direction. The protrusion 88 is attached to the outer surface 61b of the plate 61 by, for example, spot welding. The outer extension portion 87 extends obliquely from the vicinity of the protrusion 88 toward the inner extension portion 86.

[0077] like Figure 3 As shown, the flexure 57 is formed by laminating a plurality of layers. The flexure 57 includes, for example, a backing layer 91, a base layer 92, a conductive layer 93, and a cover layer 94. The backing layer 91 is an example of a substrate. The base layer 92 is an example of an insulating layer.

[0078] The body 81 and the suspension tail 82 each have a portion of the lining layer 91, the base layer 92, the conductive layer 93, and the cover layer 94. In other words, the lining layer 91, the base layer 92, the conductive layer 93, and the cover layer 94 are stacked in each of the body 81 and the suspension tail 82.

[0079] The lining layer 91 is, for example, a flexible metal plate made of stainless steel. In addition, the material of the lining layer 91 is not limited to this example. The lining layer 91 is thicker than each of the base layer 92, the conductive layer 93, and the cover layer 94. The rigidity of the lining layer 91 is higher than the rigidity of each of the base layer 92, the conductive layer 93, and the cover layer 94. The lining layer 91 has an inner surface 91a and an outer surface 91b.

[0080] The inner surface 91 a of the main body 81 faces substantially in the +Z direction. The inner surface 91 a of the main body 81 is in contact with the outer surface 61 b ​​of the plate 61 and the outer surface 56 b of the load beam 56 of the beam 72 .

[0081] The outer surface 91b is located on the opposite side of the inner surface 91a. The outer surface 91b in the body 81 faces substantially the -Z direction. When the magnetic head 51 is located on the recording surface 12a of the magnetic disk 12, the outer surface 91b in the body 81 faces the corresponding recording surface 12a of the magnetic disk 12.

[0082] The base layer 92 is made of an insulator such as polyimide (PI), for example. The base layer 92 has an inner surface 92a and an outer surface 92b. The inner surface 92a is attached to the outer surface 91b of the backing layer 91. The outer surface 92b is located on the opposite side of the inner surface 92a.

[0083] The conductive layer 93 is made of a metal such as copper and nickel covering the copper. The conductive layer 93 is disposed on the outer surface 92b of the base layer 92 and adheres to the outer surface 92b. Therefore, the base layer 92 is located between the lining layer 91 and the conductive layer 93.

[0084] Figure 4 1 is an illustrative top view showing a portion of the HGA 36 of the first embodiment. Figure 4 The cover layer 94 is omitted. Figure 4 As shown in FIG. 1 , the conductive layer 93 has a plurality of wirings 95 . The conductive layer 93 may have other portions such as pads (land pads) provided at the ends of the wirings 95 .

[0085] The plurality of wirings 95 include a write wiring 95W and a read wiring 95R. The write wiring 95W and the read wiring 95R each extend between the gimbal portion 85 and the end portion in the -Y direction of the suspension tail portion 82. The write wiring 95W and the read wiring 95R are each electrically connected to the magnetic head 51. The plurality of wirings 95 may also include other wirings.

[0086] The cover layer 94 is made of an insulator such as PI. Figure 3 As shown, the cover layer 94 covers the base layer 92 and the plurality of wirings 95, and is attached to the outer surface 92b of the base layer 92. The cover layer 94 is provided with holes for exposing the bonding pads of the conductive layer 93.

[0087] Figure 1 The PCB 17 is, for example, a rigid substrate such as a glass epoxy substrate, a multi-layer substrate, a build-up substrate, etc. The PCB 17 is disposed outside the housing 11 and mounted on the bottom wall 25 .

[0088] Various electronic components such as a relay connector electrically connected to the FPC 37 , an interface (I / F) connector connected to a host computer, and a controller for controlling the operation of the HDD 10 are mounted on the PCB 17 . The relay connector is electrically connected to the FPC 37 via a connector provided on the bottom wall 25 .

[0089] The controller of the PCB 17 drives the VCM 15 to rotate the HSA 14 around the central axis Axh. Thus, the controller controls the position of the magnetic head 51. The controller may also adjust the position of the magnetic head 51 by using a piezoelectric element provided on the HGA 36.

[0090] Furthermore, the controller of PCB 17 is electrically connected to the write wiring 95W and the read wiring 95R of the flexible member 57 via the FPC 37. The controller outputs a write signal corresponding to the information written by the magnetic head 51 to the magnetic disk 12 to the magnetic head 51 via the write wiring 95W. The magnetic head 51 outputs a read signal corresponding to the information read from the magnetic head 51 from the magnetic disk 12 to the controller of PCB 17 via the read wiring 95R. That is, the write wiring 95W transmits the write signal, and the read wiring 95R transmits the read signal.

[0091] like Figure 3 As shown, the flexure 57 is partially thinned. For example, the flexure 57 of this embodiment has two thick portions 101 and 102 and a thin portion 103. The thick portions 101 and 102 are examples of another portion of the flexure. The thick portion 101 is an example of a second covering portion. The thin portion 103 is thinner than the thick portions 101 and 102.

[0092] The combined size of the thick portions 101 and 102 is larger than the size of the thin portion 103. Figure 2In such a projection diagram viewed in the Z direction, the total area of ​​the thick portions 101 and 102 is larger than the area of ​​the thin portion 103 .

[0093] Thick portions 101, 102 and thin portion 103 each have a portion of lining layer 91, base layer 92, conductive layer 93 and cap layer 94. In other words, lining layer 91, base layer 92, conductive layer 93 and cap layer 94 are stacked in each of thick portions 101, 102 and thin portion 103.

[0094] The thick portion 101 is included in the body 81 and has the gimbal portion 85. That is, the thick portion 101 covers the outer surface 56b of the load beam 56 in the beam 72 and has the magnetic head 51 mounted thereon. The thick portion 102 is included in the suspension tail portion 82 and has the inner extension portion 86.

[0095] The thin portion 103 includes a first portion 105 , a second portion 106 , and a third portion 107 . The first portion 105 , the second portion 106 , and the third portion 107 are each a part of the thin portion 103 .

[0096] The first portion 105, the second portion 106, and the third portion 107 are arranged in the direction in which the flexible member 57 extends. The first portion 105 is provided between the second portion 106 and the third portion 107.

[0097] The first portion 105 is disposed on the outer surface 61b of the plate 61. In other words, the first portion 105 is included in the body 81 and covers the outer surface 61b of the plate 61. Figure 4 As shown, in the first portion 105, the write wiring 95W and the read wiring 95R extend non-parallel at least partially. In addition, in the first portion 105, other two of the plurality of wirings 95 may extend non-parallel.

[0098] The first portion 105 is provided with a hole 108. The hole 108 is located between the write wiring 95W and the read wiring 95R extending non-parallel. The hole 108 penetrates the base layer 92, the conductive layer 93, and the cap layer 94 to expose a portion of the outer surface 91b of the liner layer 91 to the outside of the flexure 57.

[0099] The welded portion 109, which is a portion of the lining layer 91 exposed by the hole 108, is attached to the plate 61 by, for example, spot welding. The welded portion 109 is a portion of the first portion 105 and is attached to the approximate center in the X direction of the plate 61. Alternatively, the welded portion 109 may be attached to other portions of the base plate 55.

[0100] The second portion 106 crosses the edge 56c in the projection diagram viewed from the Z direction. For example, the second portion 106 is included in the body 81, and extends between the thick portion 101 and the first portion 105 so as to cross the edge 56c of the outer surface 56b of the load beam 56. In other words, the second portion 106 extends from the first portion 105 so as to cross the edge 56c.

[0101] A portion of the second portion 106 is disposed on the outer surface 56b of the load beam 56 in the beam 72. Another portion of the second portion 106 is disposed on the through hole 76. In other words, the second portion 106 partially covers the through hole 76.

[0102] The third portion 107 is farther from the central axis Axd than the base plate 55. For example, the third portion 107 is included in the extension portion 87 and extends between the first portion 105 and the thick portion 102. The protrusion 88 extends from the third portion 107. That is, the third portion 107 is attached to the base plate 55 via the protrusion 88.

[0103] like Figure 3 As shown, the thickness of the base layer 92 in the thin portion 103 is smaller than the thickness of the base layer 92 in each of the thick portions 101 and 102. For example, the thickness of the base layer 92 in the thin portion 103 is less than half the thickness of the base layer 92 in each of the thick portions 101 and 102. In addition, the thickness of the base layer 92 in the thin portion 103 is not limited to this example.

[0104] The thickness of the lining layer 91, the conductive layer 93, and the cover layer 94 is approximately constant in the thick portions 101, 102 and the thin portion 103. As an example, the thickness of the lining layer 91 is approximately 19 μm, the thickness of the conductive layer 93 is approximately 8 μm, and the thickness of the cover layer 94 is approximately 4 μm. The thickness of the base layer 92 in the thick portions 101, 102 is approximately 10 μm, and the thickness of the base layer 92 in the thin portion 103 is approximately 5 μm. In addition, the thickness of the lining layer 91, the base layer 92, the conductive layer 93, and the cover layer 94 is not limited to this example.

[0105] In at least one of the lining layer 91, the conductive layer 93, and the cap layer 94, the thickness of the thin portion 103 may be smaller than the thickness of the thick portions 101 and 102. For example, the thickness of the lining layer 91 in the thin portion 103 may be smaller than the thickness of the lining layer 91 in each of the thick portions 101 and 102.

[0106] like Figure 2 As shown, the end 103a of the thin portion 103 in the -Y direction is spaced 0.1 mm or more from the edge 56c across the second portion 106 toward the center axis Axh. That is, the distance L1 in the Y direction between the end 103a of the thin portion 103 and the edge 56c is 0.1 mm or more.

[0107] The end 103b of the thin portion 103 in the +Y direction is spaced 0.6 mm or more from the edge 56c across which the second portion 106 crosses toward the magnetic head 51. That is, the distance L2 in the Y direction between the end 103b of the thin portion 103 and the edge 56c is 0.6 mm or more. In this embodiment, the distance L1 is longer than the distance L2.

[0108] Figure 5 This is an exemplary cross-sectional view schematically showing the HGA 36 and part of the arm 42 subjected to shock or vibration according to the first embodiment. For example, when shock or vibration acts on the HDD 10 , the arm 42 may vibrate so that the end of the arm 42 in the +Y direction approaches the magnetic disk 12 .

[0109] When the magnetic head 51 is located on the recording surface 12a of the magnetic disk 12, the magnetic head 51 floats from the recording surface 12a. Therefore, even if the arm 42 vibrates, the position of the magnetic head 51 in the Z direction is maintained substantially constant.

[0110] On the other hand, when the end of the arm 42 in the +Y direction approaches the magnetic disk 12, the edge 56c may be closer to the magnetic disk 12 than the gimbal portion 85. In this case, the load beam 56 elastically bends with the vicinity of the edge 56c as a fulcrum.

[0111] Since the edge 56c is close to the magnetic disk 12, for example, the second portion 106 of the thin portion 103 is closer to the magnetic disk 12 than other portions of the flexure 57. However, the thin portion 103 is not easy to contact the magnetic disk 12 because it is thin.

[0112] When shock or vibration acts on the HDD 10 , the magnetic disk 12 may vibrate. In this case, the amplitude of the magnetic disk 12 is largest at the outer edge 12 b of the magnetic disk 12 . That is, the outer edge 12 b of the magnetic disk 12 may vibrate so as to approach the flexure 57 .

[0113] The HGA36 is located Figure 2 In the case of the vicinity of the outer edge 12b of the magnetic disk 12 indicated by the two-dot chain line, the extension portion 87 of the flexure 57 approaches the outer edge 12b of the magnetic disk 12. At this time, if the magnetic disk 12 vibrates, the outer edge 12b of the magnetic disk 12 approaches the extension portion 87.

[0114] In this embodiment, the third portion 107 of the thin portion 103 is provided on the extension portion 87. Furthermore, the third portion 107 is attached to the base plate 55 via the protrusion 88. That is, the protrusion 88 limits the third portion 107 from being spaced apart from the base plate 55 to approach the magnetic disk 12. Therefore, the third portion 107 is not likely to contact the outer edge 12b of the magnetic disk 12 that vibrates.

[0115] In addition, the first portion 105 is attached to the base plate 55 at the welding portion 109. That is, the welding portion 109 restricts the first portion 105 from being spaced apart from the base plate 55 and approaching the magnetic disk 12. Therefore, the first portion 105 is unlikely to contact the magnetic disk 12.

[0116] In the HDD 10 according to the first embodiment described above, the base plate 55 has the outer surface 61b configured to face the magnetic disk 12. The flexure 57 has the thin portion 103 thinner than the other portion (thick portions 101, 102) of the flexure 57. The thin portion 103 has the first portion 105 covering the outer surface 61b. In the first portion 105, at least two of the plurality of wirings 95 do not extend in parallel. Since the first portion 105 is arranged on the outer surface 61b of the base plate 55, it is located near the magnetic disk 12. However, since the first portion 105 is thinner than the other portion of the flexure 57, it is possible to suppress the first portion 105 from contacting the magnetic disk 12. Furthermore, since the first portion 105 is arranged on the outer surface 61b of the base plate 55, it can be set as a portion mounted on the base plate 55. Since at least two of the plurality of wirings 95 do not extend in parallel in the first portion 105, the degree of freedom in design is high compared to the case where the wirings are limited to being arranged in parallel. Therefore, the HDD 10 of this embodiment can easily provide a portion (e.g., soldering portion 109) where the flexure 57 is mounted on the base plate 55. For example, in the first portion 105, it is easier to provide the soldering portion 109 mounted substantially in the center of the plate 61 than in the case where the plurality of wirings 95 extend in parallel. The flexure 57 is mounted on the base plate 55, so that it is prevented from being spaced apart from the base plate 55 and approaching the magnetic disk 12, and further, it is prevented from contacting the magnetic disk 12.

[0117] The flexible member 57 includes a backing layer 91 and a base layer 92 located between the backing layer 91 and a plurality of wirings 95. The plurality of wirings 95 include a write wiring 95W and a read wiring 95R. A hole 108 is provided in the first portion 105. The hole 108 is located between the write wiring 95W and the read wiring 95R that extend non-parallel, and exposes the backing layer 91. Since the write wiring 95W and the read wiring 95R extend non-parallel, the flexible member 57 can easily provide the hole 108 between the write wiring 95W and the read wiring 95R.

[0118] The welded portion 109 of the backing layer 91 exposed by the hole 108 is attached to the base plate 55. For example, a welding gun can weld the backing layer 91 to the base plate 55 through the hole 108. Therefore, the HDD 10 of this embodiment can easily attach the flexure 57 to the base plate 55.

[0119] The load beam 56 has an outer surface 56b configured to face the magnetic disk 12. The thin portion 103 has a second portion 106 extending from the first portion 105 across the edge 56c of the outer surface 56b. Generally, when the arm 42 is bent due to impact or vibration, for example, so that the front end of the arm 42 of the carriage 35 approaches the magnetic disk 12, the edge 56c of the outer surface 56b of the load beam 56 approaches the magnetic disk 12. That is, the second portion 106 that crosses the edge 56c of the outer surface 56b may approach the magnetic disk 12. However, since the second portion 106 is thinner than the other portion of the flexure 57, it is possible to suppress the second portion 106 from contacting the magnetic disk 12.

[0120] The end 103a of one side of the thin portion 103 is spaced apart by more than 0.1mm toward the center axis Axh and the edge 56c of the outer surface 56b that the second portion 106 crosses. The end 103b of the other side of the thin portion 103 is spaced apart by more than 0.6mm toward the edge 56c of the outer surface 56b that the second portion 106 crosses toward the magnetic head 51. Thus, the thin portion 103 extends over a predetermined length, thereby suppressing the flexure 57 from contacting the magnetic disk 12.

[0121] The magnetic disk 12 is configured to rotate around a center axis Axd spaced apart from the center axis Axh. The third portion 107 is farther from the center axis Axd than the base plate 55. When the magnetic head 51 is located near the outer edge 12b of the magnetic disk 12, the third portion 107 is located near the outer edge 12b of the magnetic disk 12. The magnetic disk 12 is sometimes bent, for example, due to impact or vibration, so that the outer edge 12b of the magnetic disk 12 approaches the flexure 57. However, the third portion 107 is thinner than another part of the flexure 57, so it is possible to suppress contact with the magnetic disk 12.

[0122] The thickness of the base layer 92 in the thin portion 103 is smaller than the thickness of the base layer 92 in another portion of the flexure 57. The base layer 92 such as PI can generally be formed by a method such as photolithography that can adjust the thickness. That is, it is easier to locally thin the base layer 92 than, for example, locally thin the backing layer 91. Therefore, the thin portion 103 can be easily made thinner than another portion of the flexure 57 compared to the case where the backing layer 91 is thinned.

[0123] The thickness of the base layer 92 in the thin portion 103 is equal to or less than half the thickness of the base layer 92 in another portion of the flexure 57. Thus, the flexure 57 can be more reliably prevented from coming into contact with the magnetic disk 12.

[0124] (Second embodiment)

[0125] Below, refer to Figures 6 to 8, the second embodiment is described. In addition, in the following description of the embodiments, for a component having the same function as a component already described, sometimes the same reference numeral as the component already described is marked, and the description is omitted. In addition, multiple components marked with the same reference numeral are not limited to all having the same functions and properties, and may also have different functions and properties corresponding to each embodiment.

[0126] Figure 6 It is an exemplary plan view partially showing the HGA 36 and the arm 42 according to the second embodiment. Figure 7 It is along Figure 6 An exemplary cross-sectional view of a portion of the HGA 36 and the arm 42 according to the second embodiment is schematically shown along the line F7-F7.

[0127] like Figure 6 As shown, the flexure 57 of the second embodiment has a thick portion 201 and two thin portions 202 and 203 instead of the thin portion 103. The thick portion 201 is an example of a first covering portion. The thin portion 202 is an example of a first thin portion. The thin portion 203 is an example of a second thin portion.

[0128] The thick portion 201 replaces the first portion 105 of the thin portion 103 of the first embodiment and is provided on the flexure 57. That is, the thick portion 201 is included in the body 81 and covers the outer surface 61b of the plate 61. In the thick portion 201, the write wiring 95W and the read wiring 95R extend at least partially non-parallel.

[0129] The thick portion 201 is provided with a hole 108. The lining layer 91 in the thick portion 201 has a welding portion 109. The welding portion 109 is exposed from the hole 108 and is attached to the plate 61 by, for example, spot welding.

[0130] The thin portion 202 is provided on the flexure 57 instead of the second portion 106 of the thin portion 103 of the first embodiment. That is, the thin portion 202 is included in the body 81 and extends between the thick portions 101 and 201 so as to cross the edge 56c.

[0131] The thin portion 203 replaces the third portion 107 of the thin portion 103 of the first embodiment and is provided on the flexible member 57. That is, the thin portion 203 is farther from the central axis Axd than the base plate 55. The thin portion 203 is included in the extension portion 87 and extends between the thick portion 102 and the thick portion 201. The protrusion 88 extends from the thin portion 203 and attaches the thin portion 203 to the base plate 55.

[0132] like Figure 7As shown, each of the thin portions 202 and 203 is thinner than each of the thick portions 101, 102, and 201. For example, the thickness of the base layer 92 in the thin portions 202 and 203 is less than half the thickness of the base layer 92 in each of the thick portions 101, 102, and 201. In addition, the thickness of the base layer 92 in the thin portions 202 and 203 is not limited to this example.

[0133] like Figure 6 As shown, the combined size of thick portions 101, 102, 201 is larger than the combined size of thin portions 202, 203. In other words, in the projection viewed in the Z direction, the combined area of ​​thick portions 101, 102, 201 is larger than the combined area of ​​thin portions 202, 203.

[0134] The end 202a of the thin portion 202 in the -Y direction is spaced 0.1 mm or more from the edge 56c across which the thin portion 202 crosses toward the center axis Axh. That is, the distance L3 in the Y direction between the end 202a of the thin portion 202 and the edge 56c is 0.1 mm or more.

[0135] The end 202b of the thin portion 202 in the +Y direction is spaced 0.6 mm or more from the edge 56c across which the thin portion 202 crosses toward the magnetic head 51. That is, the distance L4 in the Y direction between the end 202b of the thin portion 202 and the edge 56c is 0.6 mm or more.

[0136] Figure 8 FIG. 2 is an exemplary cross-sectional view schematically showing a portion of the HGA 36 and the arm 42 to which an impact or vibration is applied according to the second embodiment. Figure 8 As shown, when the end of the arm 42 in the +Y direction approaches the magnetic disk 12 due to, for example, impact or vibration, the load beam 56 elastically bends with the vicinity of the edge 56 c as a fulcrum.

[0137] Since the edge 56c is close to the magnetic disk 12, for example, the thin portion 202 is closer to the magnetic disk 12 than other portions of the flexure 57. However, the thin portion 202 is not easy to contact the magnetic disk 12 because it is thin.

[0138] In addition, HGA36 is located Figure 6 In the case of the vicinity of the outer edge 12b of the magnetic disk 12 indicated by the two-dot chain line, for example, due to impact or vibration, the outer edge 12b of the magnetic disk 12 approaches the thin portion 203. However, the thin portion 203 is not easy to contact the magnetic disk 12 because it is thin.

[0139] On the other hand, when the base layer 92 is thin, the impedance in the wiring 95 increases, which may affect the transmission characteristics. However, the thin portions 202 and 203 are smaller than the thick portions 101, 102, and 201. Therefore, in the thin portions 202 and 203, the influence on the transmission characteristics caused by the thinning of the base layer 92 is small.

[0140] In the HDD 10 of the second embodiment described above, the flexure 57 has thick portions 101 and 201 and thin portions 202 and 203. The thick portion 201 covers the outer surface 61b of the base plate 55. The thick portion 101 covers the outer surface 56b of the load beam 56. The thin portion 202 extends between the thick portion 201 and the thick portion 101 so as to cross the edge 56c of the outer surface 56b. The thin portion 203 is farther from the center axis Axd than the base plate 55. Generally, when the arm 42 is bent due to impact or vibration, for example, so that the front end of the arm 42 of the carriage 35 approaches the magnetic disk 12, the edge 56c of the outer surface 56b of the load beam 56 approaches the magnetic disk 12. That is, the thin portion 202 that crosses the edge 56c of the outer surface 56b sometimes approaches the magnetic disk 12. However, the thin portion 202 is thinner than other portions of the flexure 57 such as the thick portions 101 and 201, and thus can be suppressed from contacting the magnetic disk 12. In addition, when the magnetic head 51 is located near the outer edge 12b of the magnetic disk 12, the thin portion 203 is located near the outer edge 12b of the magnetic disk 12. The magnetic disk 12 may bend due to impact or vibration, for example, so that the outer edge 12b of the magnetic disk 12 approaches the flexure 57. However, the thin portion 203 is thinner than other portions of the flexure 57 such as the thick portions 101 and 201, and thus can be suppressed from contacting the magnetic disk 12. As described above, the HDD 10 of the present embodiment can suppress the flexure 57 from contacting the magnetic disk 12. In addition, since other parts of the flexible member 57 such as the thick parts 101 and 201 are thicker than the thin parts 202 and 203, the flexible member 57 can suppress the increase in impedance of the wiring 95 caused by the thinning of the flexible member 57, thereby reducing the influence on the transmission characteristics caused by the setting of the thin parts 202 and 203.

[0141] The thickness of the base layer 92 in each of the thin portions 202 and 203 is smaller than the thickness of the base layer 92 in each of the thick portions 101 and 201. It is easier to locally thin the base layer 92 such as PI than to locally thin the backing layer 91. Therefore, the thin portions 202 and 203 can be easily made thinner than the thick portions 101 and 201, compared with the case where the backing layer 91 is thinned.

[0142] The thickness of the base layer 92 in each of the thin portions 202 and 203 is equal to or less than half the thickness of the base layer 92 in each of the thick portions 101 and 201. This can more reliably prevent the flexure 57 from coming into contact with the magnetic disk 12.

[0143] The end 202a of one side of the thin portion 202 is spaced apart from the edge 56c of the outer surface 56b that the thin portion 202 crosses toward the central axis Axh by more than 0.1mm. The end 202b of the other side of the thin portion 202 is spaced apart from the edge 56c of the outer surface 56b that the thin portion 202 crosses toward the magnetic head 51 by more than 0.6mm. Thus, the thinned thin portion 202 extends over a predetermined length, and can suppress contact with the magnetic disk 12.

[0144] Several embodiments of the present invention have been described, but these embodiments are provided as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the scope of the invention. These embodiments and / or their variations are included in the scope and / or the spirit of the invention, and are included in the invention described in the claims and their equivalents.

Claims

1. A disk device comprising: The carriage is configured to rotate about a first rotation axis; disk; A base plate having a first surface configured to face the magnetic disk and mounted on the carriage; a load beam mounted on the base plate; A flexible member having a plurality of wirings and mounted on the base plate and the load beam; as well as A magnetic head is mounted on the flexure, is electrically connected to at least one of the plurality of wirings, and is configured to read and write information on the magnetic disk. The flexible member has a thin portion that is thinner than another portion of the flexible member, The thin portion has a first portion covering the first surface and in which at least two of the plurality of wirings extend non-parallel.

2. The disk device according to claim 1, The flexible member has a substrate and an insulating layer located between the substrate and the plurality of wirings. The plurality of wirings include a write wiring and a read wiring, wherein the write wiring is electrically connected to the magnetic head and transmits a write signal corresponding to information written by the magnetic head to the magnetic disk, and the read wiring is electrically connected to the magnetic head and transmits a read signal corresponding to information read by the magnetic head from the magnetic disk. The first portion is provided with a hole that is located between the write wiring and the read wiring that extend non-parallel to each other and that exposes the substrate.

3. The disk device according to claim 2, A portion of the substrate exposed through the hole is mounted on the base plate.

4. The disk device according to claim 1, The load beam has a second surface configured to face the magnetic disk. The thin portion has a second portion extending from the first portion so as to cross an edge of the second surface.

5. The disk device according to claim 4, One end of the thin portion is spaced apart from the edge of the second surface through which the second portion crosses toward the first rotation axis by 0.1 mm or more. The other end of the thin portion is spaced apart from the edge of the second surface across which the second portion crosses, toward the magnetic head, by 0.6 mm or more.

6. The disk device according to any one of claims 1 to 5, The magnetic disk is configured to rotate about a second rotation axis spaced apart from the first rotation axis. The thin portion has a third portion that is farther from the second rotation axis than the base plate.

7. The disk device according to claim 1, The flexible member has a substrate and an insulating layer located between the substrate and the plurality of wirings. The thickness of the insulating layer in the thin portion is smaller than the thickness of the insulating layer in another portion of the flexure.

8. The disk device according to claim 7, The thickness of the insulating layer in the thin portion is less than half of the thickness of the insulating layer in another portion of the flexure.

9. A disk device comprising: The carriage is configured to rotate about a first rotation axis; a magnetic disk configured to rotate about a second rotation axis spaced apart from the first rotation axis; A base plate having a first surface configured to face the magnetic disk and mounted on the carriage; A load beam having a second surface configured to face the magnetic disk and mounted on the base plate; a flexible member having a first covering portion covering the first surface, a second covering portion covering the second surface, a first thin portion extending between the first covering portion and the second covering portion in a manner transverse to an edge of the second surface, and a second thin portion farther from the second rotation axis than the base plate, each of the first thin portion and the second thin portion being thinner than each of the first covering portion and the second covering portion; and The magnetic head is mounted on the second cover portion and is configured to read and write information on the magnetic disk.

10. The disk device according to claim 9, The flexible member has a plurality of wirings, a substrate, and an insulating layer located between the substrate and the plurality of wirings. The thickness of the insulating layer in each of the first thin portion and the second thin portion is smaller than the thickness of the insulating layer in each of the first covering portion and the second covering portion.

11. The disk device according to claim 10, The thickness of the insulating layer in each of the first thin portion and the second thin portion is less than or equal to half the thickness of the insulating layer in each of the first covering portion and the second covering portion.

12. The disk device according to claim 9, One end of the first thin portion is spaced apart from the edge of the second surface through which the first thin portion crosses toward the first rotation axis by 0.1 mm or more, The other end of the first thin portion is spaced apart from the edge of the second surface, which the first thin portion crosses, toward the magnetic head by 0.6 mm or more.

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