JP2013188044A - Motor and disk drive apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem of data read-out or data writing failure due to larger deviation of a disc from a parallel state.SOLUTION: A motor comprises: a rotor 3 and a static part 2. The rotor 3 includes: a shaft 31; a rotor holder 32 in a cylindrical shape with a lid and fixed onto the shaft; a rotor magnet 33 held on an inner peripheral surface of the rotor holder; and a disc placement part 35 capable of being placed on a top of the rotor holder. The static part 2 includes a sleeve 21, a sleeve housing 22, a stator 25 and a base member 4. The sleeve housing 22 is in a cylindrical shape fixed onto an outer peripheral surface of the sleeve and has a small diameter part 22a, a large diameter part 22b located in a lower side than the small diameter part, and a caulking part 22c protruding in a lower side than the large diameter part. The stater 25 is on a top of the large diameter part, held by an outer peripheral surface of the small diameter part, and opposing against the rotor magnet in the radial direction. The base member 4 is fixed by the caulking part at a bottom of the sleeve housing and spreading in the radial direction. In the motor, the outer peripheral surface of the small diameter part includes a concave part recessed toward a radial direction at a lower side of the small diameter part than a top end of the small diameter part.

Description

  The present invention relates to a motor and a disk drive device in which a disk can be attached and detached.

  2. Description of the Related Art Conventionally, a recording disk drive motor used for reproducing / recording an information recording disk such as a CD-ROM or a DVD is equipped with a recording disk driving motor that rotationally drives these disks.

  For example, a motor mounted on a conventional optical disk drive shown in FIG. 1 of Japanese Patent Application Laid-Open No. 2011-210349 is largely formed from a stator and a rotor. The stator means all the fixing members except the rotating member, and includes a base member on which a printed circuit board is provided. The base member is provided with a sleeve holder that press-fits and holds the sleeve. The stator further includes a core fixed to the sleeve holder and a winding coil surrounding the core.

  The rotor includes a rotor body and a magnet. The rotor body is formed with a bent portion where an annular magnet facing the winding coil of the stator is mounted on the inner peripheral surface. The rotor body is formed with a rotor hub that is pressed into the shaft and fastened. In addition, a chucking device capable of placing a disk is coupled to the upper portion of the rotor body.

Further, the conventional optical disk drive device further includes an optical pickup unit, and the optical pickup unit reads or writes information on the disk.
JP 2011-210349 A

  In an optical disk drive equipped with such a motor, the sleeve holder is caulked and fixed to the base member. When the sleeve holder is caulked and fixed to the base member, if the upper surface of the rotor body, that is, the surface on which the disk is placed is inclined with respect to the base member, the parallelism of the disk to the optical pickup unit is There is a risk that a problem of reading or writing data may occur.

  Therefore, the present invention has a low parallelism of the disk mounting surface with respect to the base member and a motor with a small deflection of the rotating part, and a small parallelism of the disk mounting surface with respect to the optical pickup unit, so that data can be read or written with high accuracy. An object of the present invention is to provide a disk drive device capable of performing the above.

  An exemplary first invention of the present application includes a rotating part and a stationary part that rotatably supports the rotating part, and the rotating part is fixed to the shaft extending along a central axis extending in the vertical direction. A lid-shaped cylindrical rotor holder, a rotor magnet held on the inner peripheral surface of the rotor holder, and a disc placement portion that is placed on the upper surface of the rotor holder and can place a disc, and the stationary portion is The sleeve into which the shaft is inserted, the small-diameter portion, the large-diameter portion having a larger outer diameter than the small-diameter portion, the lower-diameter portion, and the lower-diameter portion. A cylindrical sleeve housing fixed to the outer peripheral surface of the sleeve, and mounted on the upper surface of the large-diameter portion, held on the outer peripheral surface of the small-diameter portion, and radially connected to the rotor magnet. Opposing stator and caulking part And a base member that is fixed to the lower portion of the sleeve housing and expands in the radial direction, and the outer peripheral surface of the small-diameter portion has an annular recess that is recessed inward in the radial direction below the upper end of the small-diameter portion. It has a motor.

  A second exemplary invention of the present application includes the motor, an access unit having a head for reading and writing information to and from the disk, and a housing that houses the motor and the access unit. It is a drive device.

  An exemplary third invention of the present application includes a rotating portion and a stationary portion that rotatably supports the rotating portion, the rotating portion extending along a central axis extending in the vertical direction, A rotor holder that is fixed to the shaft and has a cylindrical lid, a rotor magnet that is held on the inner peripheral surface of the rotor holder, and a disk mounting portion that is disposed on the upper surface of the rotor holder and on which a disk can be mounted. The stationary portion includes a sleeve into which the shaft is inserted, a small diameter portion, a large diameter portion positioned below the small diameter portion and having an outer diameter larger than the small diameter portion, and the large diameter portion. A cylindrical sleeve housing fixed to the outer peripheral surface of the sleeve, and mounted on the upper surface of the large-diameter portion, and the small-diameter portion. Held on the outer peripheral surface of the A stator that is radially opposed to the magnet, and a base member that is fixed to the lower portion of the sleeve housing by the caulking portion and extends in the radial direction, and the upper surface of the large diameter portion is directed downward. It is a motor which has a hollow annular recessed part and the outer peripheral surface of the said small diameter part and the inner annular surface which faces the radial direction outward of the said recessed part comprise one plane.

  A fourth exemplary invention of the present application includes the motor, an access unit having a head that performs at least one of reading and writing of information with respect to the disk, and a housing that houses the motor and the access unit. It is a drive device.

  According to the first exemplary invention of the present application, it is possible to provide a structure in which the parallelism of the upper surface of the disk mounting portion with respect to the base member is small and the deflection of the rotating portion is small.

  According to the second exemplary invention of the present application, it is possible to provide a structure in which the parallelism of the upper surface of the disk mounting unit with respect to the access unit is small and data can be read or written with high accuracy.

  According to the third exemplary invention of the present application, it is possible to provide a structure in which the parallelism of the upper surface of the disk mounting portion with respect to the base member is small and the swing of the rotating portion is small without increasing the size of the motor.

  According to the fourth exemplary invention of the present application, it is possible to provide a structure in which the parallelism of the upper surface of the disk mounting unit with respect to the access unit is small and data can be read or written with high accuracy.

FIG. 1 is a cross-sectional view of a disk drive device. FIG. 2 is a sectional view of the motor. FIG. 3 is a partially enlarged sectional view of the motor. FIG. 4 is a cross-sectional view of the vicinity of the sleeve housing according to the first embodiment. FIG. 5 is a diagram illustrating an example of a process of correcting the parallelism of the rotating unit with respect to the base member according to the first embodiment. FIG. 6 is a cross-sectional view of the vicinity of the sleeve housing according to the second embodiment. FIG. 7 is a diagram illustrating an example of a process of correcting the parallelism of the rotating unit with respect to the base member according to the second embodiment.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the following, the direction along the central axis of the motor is the vertical direction, and the shape and positional relationship of each part will be described. However, this is defined only in the vertical direction for convenience of explanation, and does not limit the installation posture when the motor and the disk drive device according to the present invention are mounted on an actual device. A direction parallel to the central axis is referred to as an axial direction, a radial direction centered on the central axis is simply referred to as a radial direction, and a circumferential direction centered on the central axis is simply referred to as a circumferential direction.

(Configuration of disk drive)
FIG. 1 is a cross-sectional view of a disk drive device 1 according to an exemplary embodiment of the present invention. The disk drive device 1 is a device that reads and writes information while rotating a removable optical disk 90 (hereinafter simply referred to as “disk 90”) about a central axis J1. As shown in FIG. 1, the disk drive device 1 includes a housing 11, a disk tray 12, a motor 13, and an access unit 14.

  The housing 11 is box-shaped. The housing 11 has a top plate portion 11a. The top plate portion 11a is a substantially flat plate-like member that extends in the radial direction. The top plate portion 11a is a member formed of metal. The housing 11 accommodates the disk tray 12, the motor 13, and the access unit 14 therein. The top plate portion 11 a is disposed above the disk tray 12, the motor 13, and the access unit 14. The disk tray 12 slides between the outside and the inside of the housing 11, thereby loading and unloading the disk 90. The motor 13 accommodated in the housing is fixed to the disc tray 12. The disk 90 is held by the rotating unit 3 of the motor 13 and is rotated about the central axis J1 by the motor 13.

  The access unit 14 has a head 14a including an optical pickup function. The head 14a is an optical pickup mechanism. The access unit 14 reads and writes information by moving the head 14 a along the recording surface of the disk 90 rotated by the motor 13. Note that the head 14 a of the access unit 14 may perform only one of reading and writing of information on the recording surface of the disk 90.

(Motor configuration)
Next, the configuration of the motor 13 will be described.

  FIG. 2 is a cross-sectional view of the motor 13. As shown in FIG. 2, the motor 13 includes a stationary part 2, a rotating part 3, a base member 4, and a circuit board 5.

  The stationary part 2 is fixed to the base member 4. The stationary part 2 includes a sleeve 21, a sleeve housing 22, a plate 23, a thrust plate 24, and a stator 25. The sleeve 21 is a sintered metal member. The sleeve 21 is impregnated with lubricating oil. The sleeve 21 is a substantially cylindrical member, and a shaft 31 described later is inserted therein. The sleeve 21 supports the shaft 31 in a rotatable manner.

  The sleeve housing 22 is a cylindrical member and has a through-hole penetrating in the vertical direction. A sleeve 21 is fixed to the surface defining the through hole of the sleeve housing 22. In other words, the sleeve housing 22 is fixed to the outer peripheral surface of the sleeve 21. The sleeve housing 22 includes a small diameter portion 22a, a large diameter portion 22b, and a caulking portion 22c. The large-diameter portion 22b is positioned below the small-diameter portion 22a and has an outer diameter larger than that of the small-diameter portion 22a. The caulking portion 22c is located below the large diameter portion 22b and protrudes downward. The base member 4 and the plate 23 are fixed to the lower portion of the sleeve housing 22 by the caulking portion 22c. In the present embodiment, the sleeve 21, the sleeve housing 22, and the plate 23 constitute a bearing unit.

  The sleeve housing 22 is a member formed by metal cutting. For example, the material of the sleeve housing 22 is brass or an aluminum alloy. The small diameter portion 22a is a substantially cylindrical portion. The inner peripheral surface of the small diameter portion 22a is a surface that defines the through hole of the sleeve housing 22 described above. That is, the sleeve 21 is press-fitted and fixed to the inner peripheral surface of the small diameter portion 22a. The large diameter portion 22b extends radially outward from the lower portion of the small diameter portion 22a. The caulking portion 22c protrudes downward from the lower surface of the large diameter portion 22b. The caulking portion 22c includes an inner protrusion 22c1 and an outer protrusion 22c2. The outer protrusion 22c2 is disposed on the outer side in the radial direction than the inner protrusion 22c1.

  The plate 23 is a plate-like member formed by pressing. The outer end portion of the plate 23 is fixed to the sleeve housing 22 by caulking the inner protrusion 22c1. By fixing the plate 23 to the sleeve housing 22, the plate 23 closes the through hole of the substantially cylindrical sleeve 21. A thrust plate 24 is disposed on the upper surface of the plate 23. The thrust plate 24 supports the shaft 31 in the axial direction by contacting the lower end surface of the shaft 31.

  The stator 25 is placed on the upper surface 22b1 of the large diameter portion 22b. Further, the stator 25 is held on the outer peripheral surface of the small diameter portion 22a. The stator 25 includes a stator core 26 having a plurality of tooth portions 26a, and a coil 27 wound around each tooth portion 26a. The stator core 26 further includes a substantially annular core back portion 26b. The core back portion 26 b is fixed to the outer peripheral surface of the small diameter portion 22 a of the sleeve housing 22. The teeth part 26a extends radially outward from the core back part 26b. The plurality of teeth portions 26a are arranged at equal intervals in the circumferential direction. The lower end portion of the coil 27 is opposed to the upper surface of the circuit board 5 with a slight gap.

  The rotating part 3 is supported so as to be rotatable with respect to the stationary part 2. The rotating unit 3 includes a shaft 31, a rotor holder 32, a rotor magnet 33, and a chuck mechanism 34. The shaft 31 is a substantially cylindrical member that extends in the vertical direction along the central axis J1. The rotor holder 32 is a substantially cylindrical member with a lid that is fixed to the shaft 31 and rotates together with the shaft 31. The rotor holder 32 is formed by pressing a thin plate. In the present embodiment, the thin plate is made of a magnetic material. The rotor magnet 33 is held on the inner peripheral surface of the rotor holder 32. The rotor magnet 33 has a substantially annular shape. The inner peripheral surface of the rotor magnet 33 is a magnetic pole surface that faces the end surface of the tooth portion 26a of the stator core 26 in the radial direction. That is, the stator 25 is located radially inward of the rotor magnet 33 and faces the rotor magnet 33 in the radial direction.

  The rotor holder 32 has a lid portion 32a, an outer cylindrical portion 32b, and an inner cylindrical portion 32c. The lid portion 32a is a disk-shaped portion that extends in the radial direction. A chuck mechanism 34 is disposed on the upper surface of the lid portion 32a. The outer cylindrical portion 32b is a cylindrical portion that extends downward from the radially outer end of the lid portion 32a. A rotor magnet 33 is held on the inner peripheral surface of the outer cylindrical portion 32b. The inner cylindrical portion 32c is a portion that extends upward from the radially inner end of the lid portion 32a. The inner peripheral surface of the inner cylindrical portion 32 c is bonded and fixed to the upper portion of the shaft 31.

  The lower end portion of the outer cylindrical portion 32b and the lower end portion of the rotor magnet 33 are opposed to the upper surface of the circuit board 5 with a slight gap.

  On the upper surface of the rotor holder 32, a substantially annular disk mounting portion 35 on which the disk 90 can be mounted is disposed. The disk 90 is placed on the lid part 32 a with its lower surface in contact with the upper surface of the disk placing part 35. Further, the inner peripheral portion of the disk 90 is held by the chuck mechanism 34. That is, the rotor holder 32, the disk mounting part 35, and the chuck mechanism 34 constitute a holding part that holds the disk 90.

  When a drive current is applied to the coil 27 of the stationary part 2, a magnetic flux is generated in the plurality of tooth parts 26 a of the stator core 26. And the torque of the circumferential direction generate | occur | produces by the effect | action of the magnetic flux between the teeth part 26a and the rotor magnet 33, and the rotation part 3 rotates centering on the central axis J1 with respect to the stationary part 2. FIG. The disk 90 held by the rotating unit 3 rotates around the central axis J1 together with the rotating unit 3.

  The base member 4 is a plate-like member that is formed by pressing and extends in the radial direction. The base member 4 supports the stationary part 2 and the circuit board 5. The circuit board 5 is disposed on the upper surface side of the base member 4. The base member 4 is fixed to the disk tray 12 of the disk drive device 1. That is, the motor 13 is attached to the disc tray 12. The motor 13 is fixed to the base member 4 by caulking the outer protrusion 22c2. That is, the lower end portion of the outer protrusion 22 c 2 is bent outward in the radial direction, and the sleeve housing 22 is fixed to the inner end portion of the base member 4. The height positions of the stationary part 2, the rotating part 3, and the circuit board 5 are set with reference to the upper surface of the base member 4. The base member 4 is made of a material having higher rigidity than the circuit board 5. For example, the base member 4 is made of a metal such as an aluminum alloy.

(Near the sleeve housing according to the first embodiment)
FIG. 3 is a partially enlarged cross-sectional view of the motor 13 according to the first embodiment. FIG. 4 is a cross-sectional view of the vicinity of the sleeve housing 22 according to the first embodiment. This will be described with reference to FIGS. The outer peripheral surface of the small diameter portion 22a of the sleeve housing 22 has an annular recess 28 that is recessed inward in the radial direction. The concave portion 28 is located below the upper end of the small diameter portion 22a. The recess 28 is defined by an upper side surface 28a, an annular surface 28b, and a lower side surface 28c. The upper side surface 28a is a flat surface facing downward. The annular surface 28b is a cylindrical surface that is located radially inward of the upper side surface 28a and extends in the axial direction. The lower side surface 28c is a planar surface that is located on the lower side and radially outside of the annular surface 28b and faces upward. Furthermore, the recessed part 28 has the upper end recessed part 28b1 further depressed radially inward at the upper end of the annular surface 28b.

  In the present embodiment, the small diameter portion 22a and the large diameter portion 22b are continuous. Moreover, since the recessed part 28 is located in the lower end part of the outer peripheral surface of the small diameter part 22a, the lower side surface 28c of the recessed part 28 is a surface connected with the large diameter part 22b. Therefore, cutting of the sleeve housing 22 can be easily performed. Further, the upper surface 22b1 of the large-diameter portion 22b and the lower side surface 28a facing upward of the recess 28 constitute one plane. Since the upper surface 22b1 of the large-diameter portion 22b and the lower side surface 28c of the recess 28 form a single plane, the sleeve housing 22 can be cut more easily.

  The outer peripheral surface of the small diameter portion 22a and the upper side surface 28a of the recess 28 are substantially perpendicular. That is, the upper side surface 28a of the recess 28 is substantially perpendicular to the central axis J1. Further, the lower side surface 28c and the upper surface 22b1 of the large diameter portion 22b are substantially perpendicular to the central axis J1.

  Further, the portion having the smallest radial thickness of the small diameter portion 22a has a larger radial thickness than the portion of the outer protrusion 22c2 that overlaps the inner end portion of the base member 4 in the radial direction. In the present embodiment, the portion constituting the upper end recess 28b1 of the sleeve housing 22 has a greater radial thickness than the portion of the outer protrusion 22c2 that overlaps the inner end of the base member 4 in the radial direction.

  Next, the process of correcting the parallelism of the motor 13 with respect to the base member 4 will be described with reference to FIG. FIG. 5 is a diagram illustrating an example of a process of correcting the parallelism of the rotating unit 3 with respect to the base member 4. When correcting the parallelism of the rotating part 3 with respect to the base member 4, first, a bearing unit composed of a sleeve 21, a sleeve housing 22, and a plate 23 fixed by caulking to the base member 4 is prepared. Also, a substantially cylindrical first jig 40, a second jig 41 having a substantially cylindrical body portion 41a and an annular claw portion 41b extending radially inward from the lower end of the body portion 41a, and the base member 4 are supported. A third jig 42 and a measuring machine (not shown) for measuring parallelism or perpendicularity are prepared.

  Next, the base member 4 is supported by the third jig 42. Specifically, the third jig 42 has three protrusions protruding upward, and the base member 4 has a through hole at a location corresponding to the protrusion of the third jig 42. The protrusion of the third jig 42 is inserted into the through hole of the base member 4, and the lower surface of the base member 4 near the through hole and the upper surface of the third jig 42 near the protrusion are in contact with each other. Supported by three jigs 42. Further, a substantially cylindrical first jig 40 is inserted into the sleeve 21. Then, the first jig 40 is rotated, and the parallelism or perpendicularity of the first jig 40 with respect to the base member 4 is measured with the measuring instrument described above, and the direction in which the first jig 40 tilts is specified. To do. In the base member 4 of the present embodiment, the parallelism or perpendicularity of the rotating part 3 with respect to the base member 4 is measured using the region near the through hole as a reference plane.

  And the 2nd jig | tool 41 is moved so that the nail | claw part 41b may be arrange | positioned in the recessed part 28 in the direction in which the 1st jig | tool 40 inclines.

  Then, the second jig 41 is tilted in a direction opposite to the direction in which the first jig 40 is tilted in a state where the upper surface of the claw portion 41b disposed in the recess 28 is in contact with the upper side surface 28a of the recess 28. As a result, the vicinity of the portion fixed by the caulking portion 22 of the base member 4 or the caulking portion 22c is deformed. As a result, the parallelism of the bearing unit with respect to the base member 4 can be corrected. As a result, the parallelism of the rotating part 3 with respect to the base member 4 is corrected.

  However, the process of correcting the parallelism of the motor 13 with respect to the base member 4 is not limited to the process described above. The order of the steps described above can also be changed without departing from the spirit.

  As described above, in the present embodiment, the outer peripheral surface of the small-diameter portion 22a has the annular recess 28 that is recessed inward in the radial direction below the upper end of the small-diameter portion 22a. It is possible to provide the motor 13 having a structure in which the parallelism of the upper surface of the 35 is small and the swing of the rotating unit 3 is small.

  Further, it is possible to provide the disk drive device 1 having a structure in which the parallelism of the upper surface of the disk mounting unit 35 with respect to the access unit 14 is small and data can be read or written with high accuracy.

  Further, the portion having the smallest radial thickness of the small-diameter portion 22a has a larger radial thickness than the portion of the outer protrusion 22c2 that overlaps the inner end portion of the base member 4 in the radial direction. It is possible to prevent the small-diameter portion 22a that holds the stator 25 from being deformed when the parallelism of 13 is corrected.

  Further, since the concave portion 28 has an upper end concave portion 28b1 that is further recessed radially inward at the upper end of the annular surface 28b, the second jig 41 is brought into contact with the upper side surface 28a of the concave portion 28 on the upper surface of the claw portion 41b. Since the area can be increased, the parallelism of the bearing unit with respect to the base member 4 can be easily corrected, and the motor 13 having a structure in which the swing of the rotating portion 3 is smaller can be provided.

(Near the sleeve housing according to the second embodiment)
Next, the motor according to the second embodiment will be described. FIG. 6 is a cross-sectional view of the vicinity of the sleeve housing 22 according to the second embodiment. An upper surface 22b1 of the large diameter portion 22b of the sleeve housing 22 has an annular recess 48 that is recessed downward. The recess 48 is defined by an inner annular surface 48a, a lower surface 48b, and an outer annular surface 48c. The inner annular surface 48a is a cylindrical surface facing radially outward. The outer annular surface 48c is a cylindrical surface that is located radially outward from the inner annular surface 48a and faces radially inward. The lower surface 48b faces upward, and the inner end portion is continuous with the lower end portion of the inner annular surface 48a. The outer end portion of the lower surface 48b is continuous with the lower end portion of the outer annular surface 48c.

  The small diameter portion 22a and the large diameter portion 22b are continuous. Furthermore, the recessed part 48 is located in the inner end part of the upper surface 22b1 of the large diameter part 22b. The outer peripheral surface of the small diameter portion 22a and the inner annular surface 48a facing the radially outward direction of the concave portion 48 constitute one plane. In other words, the inner annular surface 48a of the recess 48 is a surface connected to the small diameter portion 22a. Since the outer peripheral surface of the small diameter portion 22a and the inner annular surface 48a of the recess 48 constitute a single plane, the sleeve housing 22 can be easily cut.

  Next, the process of correcting the parallelism of the motor 13 with respect to the base member 4 will be described with reference to FIG. FIG. 7 is a diagram illustrating an example of a process of correcting the parallelism of the rotating unit 3 with respect to the base member 4. When correcting the parallelism of the rotating part 3 with respect to the base member 4, first, a bearing unit composed of a sleeve 21, a sleeve housing 22, and a plate 23 fixed by caulking to the base member 4 is prepared. The fourth jig 50 having a substantially cylindrical shape, the fifth jig 51 having a substantially cylindrical body part, the sixth jig 52 for supporting the base member 4, and a measuring instrument for measuring parallelism or perpendicularity ( Prepare (not shown).

  Next, the base member 4 is supported by the sixth jig 52. Specifically, the sixth jig 52 has three protrusions protruding upward, and the base member 4 has a through hole at a location corresponding to the protrusion of the sixth jig 42. The protrusion of the sixth jig 42 is inserted into the through hole of the base member 4, and the lower surface of the base member 4 near the through hole and the upper surface of the sixth jig 42 near the protrusion are in contact with each other. It is supported by six jigs 42. Further, a substantially cylindrical fourth jig 50 is inserted into the sleeve 21. Then, the fourth jig 50 is rotated, and the parallelism or perpendicularity of the fourth jig 50 during the rotation with respect to the base member 4 is measured by the measuring instrument described above, and the direction in which the fourth jig 50 tilts is specified. To do. In the base member 4 of the present embodiment, the parallelism or perpendicularity of the rotating part 3 with respect to the base member 4 is measured using the region near the through hole as a reference plane.

  Then, the lower end portion of the fifth jig 51 is disposed in the concave portion 48, and the inner peripheral surface of the fifth jig 51 is in contact with the outer peripheral surface of the concave portion 48 and the small diameter portion 22a in the direction in which the fourth jig 50 is inclined. Thus, the fifth jig 51 is moved.

  Then, with the inner peripheral surface of the fifth jig 51 in contact with the outer peripheral surfaces of the recess 48 and the small diameter portion 22a, the fifth jig 51 is tilted in the direction opposite to the direction in which the fourth jig 50 tilts. As a result, the vicinity of the portion fixed by the caulking portion 22 of the base member 4 or the caulking portion 22c is deformed. As a result, the parallelism of the bearing unit with respect to the base member 4 can be corrected. As a result, the parallelism of the rotating part 3 with respect to the base member 4 is corrected.

  However, the process of correcting the parallelism of the motor 13 with respect to the base member 4 is not limited to the process described above. The order of the steps described above can also be changed without departing from the spirit.

  As described above, in the present embodiment, the upper surface 22b1 of the large-diameter portion 22b has the annular recess 48 that is recessed downward. Further, since the outer peripheral surface of the small diameter portion 22a and the inner annular surface 48a facing the radially outward direction of the concave portion 48 constitute a single plane, the disk mounting portion 35 with respect to the base member 4 is not increased in size. It is possible to provide a structure in which the parallelism of the upper surface of the rotating member 3 is small and the swing of the rotating part 3 is small.

  Further, it is possible to provide the disk drive device 1 having a structure in which the parallelism of the upper surface of the disk mounting unit 35 with respect to the access unit 14 is small and data can be read or written with high accuracy.

  As mentioned above, although exemplary embodiment of this invention was described, this invention is not limited to said embodiment.

  The configurations in the above embodiments may be combined as appropriate as long as they do not contradict each other.

  The present invention can be used in motors and disk drive devices.

DESCRIPTION OF SYMBOLS 1 Disc drive device 2 Static part 3 Rotating part 4 Base member 5 Circuit board 11 Housing 11a Top plate part 12 Disc tray 13 Motor 14 Access part 14a Head 21 Sleeve 22 Sleeve housing 22a Small diameter part 22b Large diameter part 22b1 Upper surface 22c Caulking part 22c1 Inner protrusion 22c2 Outer protrusion 23 Plate 24 Thrust plate 25 Stator 26 Stator core 26a Teeth portion 27 Coil 28 Recess 28a Upper side surface 28b Annular surface 28b1 Upper end recess portion 28c Lower side surface 31 Shaft 32 Rotor holder 32a Lid portion 32b Outer cylindrical portion 33c Inner cylindrical portion 33 Rotor Magnet 34 Chuck mechanism 35 Disc placement portion 48 Recessed portion 48a Inner annular surface 48b Lower surface 48c Outer annular surface 48c
90 Optical disc J1 Central axis

Claims (12)

A rotating part;
A stationary part that rotatably supports the rotating part;
With
The rotating part is
A shaft extending along a central axis extending in the vertical direction;
A lid-shaped cylindrical rotor holder fixed to the shaft;
A rotor magnet held on the inner circumferential surface of the rotor holder;
A disk mounting portion disposed on the upper surface of the rotor holder and capable of mounting a disk;
Have
The stationary part is
A sleeve into which the shaft is inserted;
A small-diameter portion, a large-diameter portion located below the small-diameter portion and having an outer diameter larger than the small-diameter portion, and a caulking portion located below the large-diameter portion and projecting downward A cylindrical sleeve housing fixed to the outer peripheral surface of the sleeve;
A stator mounted on the upper surface of the large-diameter portion, held on the outer peripheral surface of the small-diameter portion, and opposed to the rotor magnet in the radial direction;
A base member fixed to a lower portion of the sleeve housing by the caulking portion and extending in a radial direction;
With
The outer peripheral surface of the small diameter portion has an annular concave portion that is recessed inward in the radial direction below the upper end of the small diameter portion. The motor according to claim 1,
The said recessed part is located in the lower end part of the outer peripheral surface of the said small diameter part. The motor according to claim 1,
The concave portion is defined by an upper side surface that is planar, an annular surface that is located radially inward of the upper side surface, and a lower side surface that is located below the annular surface. The motor according to claim 3,
The lower surface is a plane perpendicular to the central axis and connected to the large diameter portion. The motor according to claim 3 or 4,
The annular surface is a cylindrical surface. The motor according to any one of claims 3 to 5,
The outer peripheral surface of the small-diameter portion and the upper side surface of the recess are perpendicular to each other. The motor according to any one of claims 3 to 6,
The upper end of the annular surface has an upper end recess that is further recessed radially inward. The motor according to any one of claims 1 to 7,
The caulking portion includes an outer protrusion,
The lower end portion of the outer protrusion is bent outward in the radial direction, and the sleeve housing is fixed to the inner end portion of the base member. The motor according to claim 8, wherein
The portion where the thickness of the small diameter portion is the smallest in the radial direction is greater in the radial direction than the portion of the outer protrusion that overlaps the inner end portion of the base member in the radial direction. A motor according to any one of claims 1 to 9;
An access unit having a head for performing at least one of reading and writing of information with respect to the disk;
A housing for housing the motor and the access unit;
A disk drive device comprising: A rotating part;
A stationary part that rotatably supports the rotating part;
With
The rotating part is
A shaft extending along a central axis extending in the vertical direction;
A lid-shaped cylindrical rotor holder fixed to the shaft;
A rotor magnet held on the inner circumferential surface of the rotor holder;
A disk mounting portion disposed on the upper surface of the rotor holder and capable of mounting a disk;
Have
The stationary part is
A sleeve into which the shaft is inserted;
A small-diameter portion, a large-diameter portion located below the small-diameter portion and having an outer diameter larger than the small-diameter portion, and a caulking portion located below the large-diameter portion and projecting downward A cylindrical sleeve housing fixed to the outer peripheral surface of the sleeve;
A stator mounted on the upper surface of the large-diameter portion, held on the outer peripheral surface of the small-diameter portion, and opposed to the rotor magnet in the radial direction;
A base member fixed to a lower portion of the sleeve housing by the caulking portion and extending in a radial direction;
With
The upper surface of the large-diameter portion has an annular recess that is recessed downward,
The motor in which the outer peripheral surface of the small-diameter portion and the inner annular surface facing the radially outward direction of the recess constitute a single plane. A motor according to claim 11;
An access unit having a head for performing at least one of reading and writing of information with respect to the disk;
A housing for housing the motor and the access unit;
A disk drive device comprising:

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