JP2019118218A - Spindle motor - Google Patents

Abstract

To provide a technology of being able to prevent an FPC board from being separated from a base plate.SOLUTION: In a spindle motor 1, a base plate 10 includes, on the outer side, a spindle motor lateral wall portion 12 which serves as one end-side contact portion protruding from the outside so as to come into contact with one end side of an FPC board 20, a voice coil motor lateral wall portion 13 which serves as the other end-side contact portion protruding from the outside so as to come into contact with the other end side of the FPC board 20, and an accommodating recess portion 30 which is at least one recess portion formed between the spindle motor lateral wall portion 12 and the voice coil motor lateral wall portion 13. The spindle motor lateral wall portion 12 is formed closer to a through hole 15 than the voice coil motor lateral wall portion 13. The accommodating recess portion 30 is configured to accommodate a part of the FPC board 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a spindle motor.

  Conventionally, various spindle motors are used to rotate a hard disk of a hard disk drive. Such a spindle motor includes, for example, a base plate, a shaft supported by the base plate via a sleeve, a stator fixed to the base plate, and a rotor fixed to the shaft. In the spindle motor, for example, a flexible printed circuit board (hereinafter also referred to as an FPC board) is attached and fixed to the outside of a base plate (see, for example, Patent Document 1). Also, in the spindle motor, the lead wire of the coil of the stator is pulled out to the outside through the lead wire hole formed in the base plate and the connection hole formed in the FPC board, and soldered and connected to the soldered pad of the FPC board ing. In the FPC board, a predetermined wiring (conductive layer) is formed of copper foil or the like on a base material (insulating layer) made of a film-like insulator, and a stator coil is connected via a lead connected to this wiring. Supply current.

JP, 2011-234602, A

  In the hard disk drive, like the spindle motor 200 shown in FIG. 6, the base plate 201 has wall portions 203 for positioning both ends of the FPC board 202. The FPC board 202 has pads (terminals) for supplying power at two or more places. In order to maintain the positional accuracy of the pads with respect to the base plate 201, positional displacement of the FPC board 202 is suppressed by the positioning wall portions 203 at two or more ends in the extending direction of the FPC board 202. The length in the extension direction of the FPC board 202 may be longer than the length between the positioning wall portions 203 due to the variation. In this case, the FPC board 202 peels off from the base plate 201 and floats. If the floating portion of the FPC board 202 is in the vicinity of the lead wire hole 204, gas may leak from the lead wire hole 204 and the air tightness in the hard disk drive may be impaired.

  An object of the present invention is to provide a technology capable of preventing the FPC board from floating from the base plate.

  A spindle motor according to an aspect of the present invention includes a base plate provided with a through hole for drawing out a lead wire of a coil of a stator to the outside, and a flexible printed circuit connected to the lead wire and adhesively fixed to the outside of the base plate Equipped with The base plate protrudes from the outside so as to abut on one end side abutting portion which protrudes from the outside so as to abut on one end side of the flexible printed circuit and the other end side of the flexible printed circuit It has an accommodation recess which is a recess formed at least one between the other end side abutting part and the other end side abutting part. The one end side contact portion is formed closer to the through hole than the other end side contact portion, and a part of the flexible printed board is accommodated in the accommodation recess.

  In the spindle motor according to one aspect of the present invention, a flat surface is formed on the outer side of the base plate, and the receiving recess and the other end side contact portion are formed on the flat surface.

  The spindle motor which concerns on 1 aspect of this invention WHEREIN: The inclined surface which follows the said plane is formed in the said outer side of the said baseplate, and the said accommodation recessed part is formed also in the said inclined surface.

  In the spindle motor according to one aspect of the present invention, a flat surface is formed on the outer side of the base plate, the other end side contact portion is formed on the flat surface, and the flat surface is formed on the outer side of the base plate. The following inclined surface is formed, and the accommodation recess is formed across the connection portion between the flat surface and the inclined surface.

  In the spindle motor according to one aspect of the present invention, a flat surface is formed on the outer side of the base plate, the other end side contact portion is formed on the flat surface, and the flat surface is formed on the outer side of the base plate An inclined surface is formed, and the receiving recess is formed on the inclined surface.

  In the spindle motor according to one aspect of the present invention, the bottom surface of the housing recess is gently connected to the outer flat surface of the base plate.

  According to the spindle motor of the present invention, it is possible to prevent the FPC board from floating from the base plate.

FIG. 1 is a cross-sectional view schematically showing a configuration of a hard disk drive provided with a spindle motor according to an embodiment of the present invention. FIG. 1 is a partial enlarged cross-sectional view schematically showing a configuration of a spindle motor according to an embodiment of the present invention. FIG. 1 is a bottom view schematically showing a configuration of a spindle motor according to an embodiment of the present invention. FIG. 4 (a) is a cross-sectional view schematically showing the configuration of the accommodation recess of the spindle motor according to the embodiment of the present invention, and FIG. 4 (b) is a spindle motor according to the embodiment of the present invention It is sectional drawing which shows roughly the structure of the accommodation recessed part in a modification. 5 (a) to 5 (c) are cross-sectional views schematically showing the configuration of the accommodation recess in the modification of the spindle motor according to the embodiment of the present invention. It is sectional drawing which shows roughly the structure of the conventional spindle motor.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view schematically showing a configuration of a hard disk drive 100 provided with a spindle motor 1 according to an embodiment of the present invention. FIG. 2 is a partial enlarged cross-sectional view schematically showing the configuration of the spindle motor 1. FIG. 3 is a bottom view schematically showing the configuration of the spindle motor 1. 4 (a) is a cross-sectional view schematically showing the configuration of the housing recess 30 of the spindle motor 1, and FIG. 4 (b) schematically shows the configuration of the housing recess 30 in a modification of the spindle motor 1. FIG. Hereinafter, for convenience of explanation, the direction extending along the central axis Y1 of the spindle motor 1 in FIG. 1 is referred to as the arrow ab direction, the arrow a direction is the upper side, and the arrow b direction is the lower side. Further, the longitudinal direction of the spindle motor 1 in FIG. 1 is taken as the direction of the arrow cd, the direction of the arrow c as the left, and the direction of the arrow d as the right. In the following description, when describing the positional relationship and direction of each member using upper, lower, left and right, it indicates the positional relationship and direction in the drawings to the last, and indicates the positional relationship and direction when incorporated into an actual device Absent.

  The spindle motor 1 according to the embodiment of the present invention is connected to the base plate 10 formed with the through holes 15 for drawing the lead wire 45 of the coil 44 of the stator 42 to the outside, and the lead wire 45. And an FPC (Flexible Printed Circuits) substrate 20 adhesively fixed to the side (in the direction of the arrow b)). The base plate 10 is provided on the outside with the spindle motor side wall 12 as one end side abutting portion projecting from the outside so as to abut on one end side of the FPC board 20 and the outside so as to abut on the other end side of the FPC board 20. The voice coil motor side wall portion 13 as the other end side contact portion protruding from the side, and the housing concave portion 30 which is a concave portion formed at least one between the spindle motor side wall portion 12 and the voice coil motor side wall portion 13 . The spindle motor side wall portion 12 is formed closer to the through hole 15 than the voice coil motor side wall portion 13, and the accommodation recess 30 is configured to accommodate a part of the FPC board 20. Hereinafter, the configuration of the spindle motor 1 will be specifically described.

  As shown in FIG. 1, the hard disk drive 100 provided with the spindle motor 1 is provided with a cover 101 which seals the inside of the base plate 10 of the spindle motor 1 to form a clean space with extremely little dust and dirt. ing. The cover 101 and the base plate 10 form a housing of the hard disk drive 100. An internal space formed by the cover 101 and the base plate 10 is filled with a gas. The gas is, for example, air or helium. One hard disk (recording disk) 102 is mounted on the outer peripheral surface of a rotor hub 51 of the rotor unit 50 described later.

  The hard disk 102 is fixed to the rotor hub 51 by screwing the center pin 103 into the processed axial screw hole at the upper end (in the direction of the arrow a) of the rotation shaft to fix the clamp member 104. Thus, the hard disk 102 rotates integrally with the rotor hub 51. Although one hard disk 102 is mounted on the rotor hub 51 in the embodiment of the present invention, the number of hard disks 102 is not limited to this.

  In addition, the hard disk drive 100 moves the magnetic head 105 for writing and / or reading information to the hard disk 102, the arm 106 supporting the magnetic head 105, and the magnetic head 105 and the arm 106 to required positions. And a voice coil motor 107. The voice coil motor 107 has a coil 108 and a magnet 109 provided opposite to the coil 108.

  The magnetic head 105 is attached at a predetermined position of the base plate 10 to the tip of the access portion 110 fixed so as to be pivotally supported. The magnetic head 105 is disposed, for example, with respect to one hard disk 102 so as to sandwich the one hard disk 102, and performs writing and / or reading of information on both sides of the hard disk 102. . In the embodiment of the present invention, since the hard disk 102 is configured as one sheet, a pair of magnetic heads 105 is provided, but the number of hard disks 102 is not limited to this, and the configuration is not limited to this. Accordingly, a magnetic head 105 may be provided for each hard disk 102.

  As shown in FIG. 2, the spindle motor 1 includes a stator portion 40, a rotor portion 50, and a fluid dynamic bearing mechanism (hereinafter, bearing mechanism) 60 utilizing fluid dynamic pressure of a lubricant (not shown). ing. In the spindle motor 1, the rotor unit 50 is rotatably supported relative to the stator unit 40 via the bearing mechanism 60.

  The stator unit 40 includes a base plate 10, which is a part of a housing of the hard disk drive 100, and a stator 42 attached to the outer periphery of a cylindrical boss 41 of the base plate 10. The stator 42 is configured by winding a coil 44 around a stator core 43. An FPC board 20 is attached to a lower side surface 10 a which is a surface on the outer side (lower side (arrow b direction)) of the base plate 10. A control current is supplied to the stator 42 from an output end 27 of the FPC board 20 described later.

  The rotor unit 50 has a covered cylindrical rotor hub 51 to which the hard disk 102 is attached, a cylindrical yoke 52 fixed inside the cylindrical portion of the rotor hub 51, and multipole attachment fixed inside the yoke 52. And a rotor magnet 53 which is magnetized. In the hole 54 formed at the center of the rotor hub 51, the upper end (the direction of the arrow a) of the shaft 61 of the bearing mechanism 60 is fixed.

  The bearing mechanism 60 includes a shaft 61, a sleeve 62 into which the shaft 61 is inserted, and a lubricant 69 (described later) formed between the shaft 61 and the sleeve 62 (described later). Not shown). The shaft portion 61 includes a shaft 63 and a thrust plate 64. The thrust plate 64 is attached to the lower end (in the direction of the arrow b) of the shaft 63, and is formed in a disk shape spreading outward in the radial direction. The sleeve portion 62 includes a substantially cylindrical sleeve 65 into which the shaft 63 is inserted, and a counter plate 66 attached to the lower end (in the direction of the arrow b) of the sleeve 65.

  The sleeve portion 62 is fixed to the inside of the boss portion 41 of the base plate 10. A first concave portion 67 having a large diameter is formed in the lower portion (direction of arrow b) of the sleeve 65, and a second concave portion having a diameter smaller than the first concave portion 67 on the upper side (direction of arrow a) of the first concave portion 67. 68 are formed. In the sleeve portion 62, the counter plate 66 is fitted into the first recess 67 of the sleeve 65, and the thrust plate 64 of the shaft portion 61 is accommodated in the space formed between the second recess 68 and the counter plate 66. There is.

  In the bearing mechanism 60, a gap 69 formed between the sleeve 65 and the shaft 63, a gap 70 formed between the sleeve 65 and the thrust plate 64, and a gap formed between the thrust plate 64 and the counter plate 66. And the gaps 69 to 71 are filled with a lubricant (not shown).

  A radial dynamic pressure groove (not shown) for generating a fluid dynamic pressure of the lubricant is formed on one of the surfaces of the sleeve 65 and the shaft 63 facing each other. A thrust dynamic pressure groove (not shown) for generating a fluid dynamic pressure of a lubricant is formed on one of the surfaces of the sleeve 65 and the thrust plate 64 facing each other. Further, a thrust dynamic pressure groove (not shown) for generating a fluid dynamic pressure of a lubricant is formed on any one of the surfaces of the thrust plate 64 and the counter plate 66 facing each other.

  The radial dynamic pressure grooves and the thrust dynamic pressure grooves are formed, for example, in a herringbone shape or a spiral shape. When the spindle motor 1 is driven by such a bearing mechanism 60, the shaft portion 61 is supported in a non-contact manner in the radial and axial directions with respect to the sleeve portion 62, and the rotor portion 50 rotates with respect to the stator portion 40. It is supposed to be.

  As shown in FIGS. 2 and 3, the lower surface 10a of the base plate 10 extends from the spindle motor 1 toward the voice coil motor 107, and has a recess 11 recessed toward the upper side (arrow a direction) of the base plate 10. It is formed. In the recess 11 of the base plate 10, a spindle motor side wall 12 as one end side contact portion formed on the spindle motor 1 side and a voice coil motor as the other end side contact portion formed on the voice coil motor 107 side. A side wall 13 is provided.

  The bottom portion 14 of the recess 11 has a spindle motor side flat surface 14a on which the spindle motor side wall portion 12 is formed, a voice coil motor side flat surface 14b on which the voice coil motor side wall portion 13 is formed, and a spindle motor side flat surface 14a. And an inclined surface 14c connecting the voice coil motor side flat surface 14b. The end of the spindle motor side flat surface 14a and the end of the inclined surface 14c are connected gently, and the end of the inclined surface 14c and the end of the voice coil motor side flat surface 14b are connected gently. . The voice coil motor side flat surface 14 b is provided above the spindle motor side flat surface 14 a (in the direction of the arrow a). In the inclined surface 14c, the thickness of the base plate 10 increases from the voice coil motor side flat surface 14b toward the spindle motor side flat surface 14a. The inclined surface 14c is inclined upward (in the direction of the arrow a) from the end of the spindle motor side flat surface 14a toward the end of the voice coil motor side flat surface 14b.

  The spindle motor side flat surface 14a at the bottom 14 of the recess 11 is a base plate between the lower surface 10a and the upper surface 10b of the base plate 10 corresponding to the four lead wires 45 drawn from the coil 44 of the stator 42. Four through holes 15 penetrating through 10 are formed. An insulating bushing 16 is disposed in the through hole 15. Further, only one lead wire 45 is passed through one through hole 15. The insulating bushing 16 is fixed to the inner peripheral surface of the through hole 15 by means such as press fitting. Moreover, it is preferable that the coil 44 and the lead wire 45 be comprised from a single member.

  In the recess 11, the FPC board 20 is attached and fixed by an adhesive (not shown). In the FPC board 20, for example, a conductive layer (wiring) is formed of copper foil or the like on an insulating layer (base material) made of a film-like insulator such as polyimide. On the surface of the FPC board 20, a pad (terminal) in which a part of the conductive layer is exposed is formed. Further, an adhesive is pressure-bonded to the back surface of the FPC board 20 in advance, and the FPC board 20 is adhered and fixed to the outer side (lower side (arrow b direction)) of the base plate 10 by this adhesive. Specifically, the FPC board 20 is attached to the bottom 14 of the recess 11. In the FPC board 20, four connection holes 23 penetrating the FPC board 20 between the lower side surface 20a and the upper side surface 20b of the FPC board 20 are formed at positions corresponding to the four through holes 15 of the base plate 10. . In other words, the four connection holes 23 communicate with each of the four through holes 15 of the base plate 10 so that the FPC board 20 is adhesively fixed to the outside of the base plate 10.

  The four lead wires 45 drawn out from the coil 44 of the stator 42 are electrically connected to the pads (conductive layers) of the FPC board 20 through the corresponding four through holes 15 and four connection holes 23, respectively. It is soldered by The connection holes 23 of the FPC board 20 are sealed by solder 24. In other words, the four through holes 15 respectively communicating with the four connection holes 23 are sealed by the solder 24 soldered with the pad of the FPC board 20 (and an adhesive which is sometimes crimped to the FPC board 20). Ru. Therefore, the internal space of the hard disk drive 100 is kept airtight. The through holes 15 may be sealed not only by the solder 24 but also by an adhesive for sealing the connection holes 23 of the FPC board 20.

  The spindle motor side end 25 which is the end on the spindle motor 1 side of the FPC board 20 is in contact with or close to the spindle motor side wall 12 and is formed in accordance with the shape of the spindle motor side wall 12. The voice coil motor side end 26, which is the end on the voice coil motor 107 side in the FPC board 20, is in contact with or close to the voice coil motor side wall 13, and is formed in accordance with the shape of the voice coil motor side wall 13. It is done. In the FPC board 20, the spindle motor side end 25 abuts or approaches according to the shape of the spindle motor side wall portion 12, and the voice coil motor side end 26 abuts according to the shape of the voice coil motor side wall portion 13 They are brought into close proximity and aligned in the desired position in the recess 11. The shape of the spindle motor side wall portion 12 and the voice coil motor side wall portion 13 may be any shape as long as the FPC board 20 can be positioned at a desired position. For example, the shape (cross-sectional shape) seen from the lower side to the upper side is linear , L-shaped, T-shaped.

  An output end 27 (pad) for connection to the outside is provided in the vicinity of the voice coil motor side end 26 on the lower side surface 20 a of the FPC board 20. Further, on the lower surface 20 a of the FPC board 20, a continuity inspection unit 28 (pad) for inspecting the continuity of the stator 42 is provided in the vicinity of the spindle motor side end 25.

  In the bottom portion 14 of the recess 11 of the base plate 10, an accommodation recess 30 is formed which is recessed to the upper side (the direction of the arrow a) of the base plate 10. The housing recess 30 is formed, for example, on the voice coil motor side flat surface 14b of the bottom portion 14, and is formed in a rectangular shape or a substantially rectangular shape when viewed from the lower side to the upper side. The width of the housing recess 30 is larger than the width of the FPC board 20.

  The accommodation recess 30 has accommodation wall portions 31 and 32 extending in a direction crossing the extension direction of the FPC board 20. For example, as shown in FIG. 4A, the left side of the accommodation recess 30 (arrow c direction). The left accommodation wall 31 which is a wall portion and the right accommodation wall 32 which is a wall of the right side (direction of arrow d) of the accommodation recess 30 respectively extend along or parallel to the vertical direction (direction of arrow ab) . The accommodation recess 30 is configured to accommodate a part of the FPC board 20.

  As shown in FIG. 4A, the thickness of the FPC board 20 is A, the depth of the housing recess 30 is B, and the length of the housing recess 30 extending from the spindle motor 1 side toward the voice coil motor 107 is C. I assume. The thickness A of the FPC board 20 is smaller than the depth B of the housing recess 30, and the depth B of the housing recess 30 is smaller than the length C of the housing recess 30. Further, it is desirable that the depth B of the housing recess 30 be greater than twice the thickness A of the FPC board 20. In addition, it is desirable that the length C of the housing recess 30 be greater than 20 times the thickness A of the FPC board 20. As shown in FIG. 4B, the bottom surface 33 of the housing recess 30 is gently connected to the lower side surface 10a of the base plate 10, and the left housing wall 31 and the right housing wall 32 are tapered or It may be R-shaped.

  As described above, in the spindle motor 1 according to the embodiment of the present invention, the base plate 10 includes the housing recess 30 between the spindle motor side wall 12 and the voice coil motor side wall 13, and the housing recess 30 is the FPC board Accommodates some of the twenty. Therefore, even when the length in the extension direction (longitudinal direction) of the FPC board 20 is longer than the length between the spindle motor side wall portion 12 and the voice coil motor side wall portion 13, As a part is accommodated in the accommodation recess 30, the FPC board 20 can be prevented from peeling off and floating from the base plate 10. As a result, it is possible to prevent the leakage of gas from the four through holes 15 of the base plate 10 and the loss of air tightness in the hard disk drive 100. Further, by preventing the floating of the FPC board 20, it is possible to prevent the FPC board 20 from contacting (interfering with) a device such as a personal computer when the hard disk drive device 100 is attached to the device such as a personal computer. Can.

  Further, in the spindle motor 1, the housing recess 30 is formed on the voice coil motor side flat surface 14 b at the bottom 14 of the recess 11 of the base plate 10. As described above, the accommodation recess 30 is formed apart from the four through holes 15 via the inclined surfaces 14 c, thereby effectively preventing the FPC board 20 from peeling off and floating from the base plate 10. Can.

  Further, in the spindle motor 1, as described above, the bottom surface 33 of the accommodation recess 30 is gently connected to the lower side surface 10a of the base plate 10, and the left accommodation wall 31 and the right accommodation wall 32 are tapered or It may be R-shaped. Thus, by making the left accommodation wall 31 and the right accommodation wall 32 tapered, the length of the FPC board 20 is longer than the length between the spindle motor side wall 12 and the voice coil motor side wall 13. In this case, part of the FPC board 20 can be further easily accommodated in the accommodation recess 30.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, It includes all the aspects contained in the concept of this invention, and a claim. In addition, the respective configurations may be selectively combined as appropriate so as to achieve at least a part of the problems and the effects described above. For example, the shape, material, arrangement, size, and the like of each component in the above embodiment can be appropriately changed according to the specific use mode of the present invention.

  For example, in the spindle motor 1, the embodiment of the present invention has been described by way of example in which the accommodation recess 30 is formed on the voice coil motor side flat surface 14b at the bottom 14 of the recess 11 of the base plate 10. Not only this but as shown to FIG. 5 (a)-(c), you may form the accommodation recessed part 30 in various positions.

  For example, as shown to Fig.5 (a), the accommodation recessed part 30 may be formed over the connection part of the voice coil motor side flat surface 14b and the inclined surface 14c. Since the FPC board 20 is also bent and attached at the connection portion, it is conceivable that the FPC board 20 may float due to peeling. However, by accommodating a part of the FPC board 20 in the accommodation recess 30 provided in the connection portion, it is possible to prevent the FPC board 20 from floating due to peeling. Moreover, as shown to FIG. 5B, the accommodation recessed part 30 may be formed in the inclined surface 14c. When the FPC board 20 is attached from both sides of the spindle motor side wall portion 12 (flat surface 14a) and the voice coil motor side wall portion 13 (flat surface 14b), the FPC board 20 peels off at the inclined surface 14c between them. It is possible that it floats. However, by accommodating a part of the FPC board 20 in the accommodation recess 30 of the inclined surface 14 c, it is possible to prevent the FPC board 20 from floating due to peeling.

  Moreover, as shown in FIG.5 (c), the accommodation recessed part 30 may be formed in the voice coil motor side flat surface 14b and the inclined surface 14c. Thus, even if there is a risk that the FPC board 20 can not be accommodated in a single accommodation recess 30 due to the plurality of accommodation recesses 30 being formed on the voice coil motor side flat surface 14b and the inclined surface 14c. A part of the FPC board 20 can be accommodated in the two accommodation recesses 30 to effectively prevent the FPC board 20 from peeling off and floating from the base plate 10.

  In the spindle motor 1, the embodiment of the present invention has been described by way of example in which the FPC board 20 is attached and fixed with the adhesive in the recess 11, but the present invention is not limited to this. It is not necessary to have the recess 11. In this case, the spindle motor side wall 12 and the voice coil motor side wall 13 are erected from the base plate 10, and the FPC board 20 is brought into contact with the spindle motor side end 25 according to the shape of the spindle motor side wall 12. The voice coil motor side end portion 26 is abutted in conformity with the shape of the voice coil motor side wall portion 13 so as to be aligned at a desired position. Further, the positioning of the FPC board can be performed by other positioning members (for example, pins) as well as the spindle motor side wall portion 12 and the voice coil motor side wall portion 13 erected on the base plate 10.

  DESCRIPTION OF SYMBOLS 1 ... Spindle motor, 10 ... Base plate, 10a ... Lower side, 10b ... Upper side, 11 ... Recess, 12 ... Spindle motor side wall part 13 ... Voice coil motor side wall part 14 ... Bottom part 14a ... Spindle motor side flat surface, 14b: voice coil motor side flat surface, 14c: inclined surface, 15: through hole, 16: insulating bushing, 20: FPC board (flexible printed circuit board), 20a: lower side, 20b: upper side, 23: connection hole, 24 ... Solder, 25 ... Spindle motor side end, 26 ... Voice coil motor side end, 27 ... Output end, 28 ... Conductivity inspection unit, 30 ... Accommodation recess, 31 ... Left accommodation wall, 32 ... Right accommodation wall, DESCRIPTION OF SYMBOLS 40 ... Stator part, 41 ... Boss part, 42 ... Stator, 43 ... Stator core, 44 ... Coil, 45 ... Leader, 50 ... Rotor part, 51 ... Rotor hub 52: Yoke, 53: Rotor magnet, 54: Hole portion, 60: Bearing mechanism, 61: Shaft portion, 62: Sleeve portion, 63: Shaft, 64: Thrust plate, 65: Sleeve, 66: Counter plate, 67: 47th 1 recessed portion 68 second recessed portion 69 to 71 gap 100 hard disk drive 101 cover 102 hard disk 103 center pin 104 clamping member 105 magnetic head 106 arm 107 Voice coil motor, 108: coil, 109: magnet, 110: access part

Claims (6)

A base plate provided with a through hole for drawing out the lead wire of the stator coil to the outside;
And a flexible printed circuit board connected to the lead wire and adhesively fixed to the outside of the base plate,
The base plate protrudes from the outside so as to abut on one end side abutting portion which protrudes from the outside so as to abut on one end side of the flexible printed circuit and the other end side of the flexible printed circuit And a receiving recess which is a recess formed at least one between the one end side contacting portion and the other end side contacting portion,
The one end side contact portion is formed closer to the through hole than the other end side contact portion,
A spindle motor characterized in that the accommodation recess is configured to accommodate a part of the flexible printed circuit board.   The spindle motor according to claim 1, wherein a flat surface is formed on the outer side of the base plate, and the receiving recess and the other end side contact portion are formed on the flat surface. The outer surface of the base plate is formed with an inclined surface continuing to the plane,
3. The spindle motor according to claim 2, wherein the receiving recess is also formed on the inclined surface. A flat surface is formed on the outer side of the base plate, and the other end side contact portion is formed on the flat surface,
The outer surface of the base plate is formed with an inclined surface continuing to the plane,
The spindle motor according to claim 1, wherein the receiving recess is formed across a connection portion between the flat surface and the inclined surface. A flat surface is formed on the outer side of the base plate, and the other end side contact portion is formed on the flat surface,
The outer surface of the base plate is formed with an inclined surface continuing to the plane,
The spindle motor according to claim 1, wherein the receiving recess is formed in the inclined surface.   The spindle motor according to any one of claims 1 to 5, wherein a bottom surface of the receiving recess is smoothly connected to the outer flat surface of the base plate.

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