JP2014203472A - Spindle motor and disk drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an adhesive from entering an annular groove when a turn table and a rotor holder are fixed with an adhesive even in the simple configuration of an annular plate.SOLUTION: A turn table 41 comprises a table body 5 including: an annular recessed part 51 having a hollow facing up; a radially-outwardly-spreading outside annular face 531 of the inside face of the annular recessed part on the radially outside; an outside opposite face 532 extending downward from the radially external edge of the outside annular face; and an inwardly-spreading inside annular face 541 of the inside face of the annular recessed part on the radially inside. The turn table further comprises: a plurality of spherical bodies 61 arranged in the annular recessed part; and an annular closing member 62 closing the lower opening of the annular recessed part. An empty space in which an adhesive is interposed is provided between a lid part 222 of a rotor holder 22 and the turn table. The annular closing member is an annular flat plate. The outside annular face is in contact with the upper face of the annular closing member. The outside opposite face is opposite the outer peripheral face of the annular closing member, and the inside annular face is in contact with the upper face of the annular closing member.

Description

  The present invention relates to a spindle motor and a disk drive device equipped with a chucking device that allows a disk-shaped disk to be attached and detached.

  In recent years, with the increase in the recording / reproducing speed on a disk-shaped disk such as a CD or DVD, the rotational speed of the disk and the spindle motor that rotates the disk has been improved. As a chucking device that supports high-speed rotation of a disk, a structure having a cone including an annular inclined surface that is in contact with the entire inner peripheral surface of the central opening of the disk is employed. The cone is movable along the axial direction of the shaft serving as the rotation axis. The cone is biased upward in the axial direction by an elastic member such as a coil spring.

A turntable for placing a disk is arranged around the cone. A rotor holder is disposed below the turntable. As a structure of such a conventional chucking device, for example, there is one disclosed in Japanese Patent Laid-Open No. 2008-5584.
JP 2008-5584 A

  By the way, in the spindle motor of the type exemplified in Patent Document 1, the height of the spindle motor is limited in consideration of the standard of the disk drive device. When the turntable is fixed to the shaft, the axial length where the turntable and the shaft are in contact cannot be secured, and the fastening strength may be insufficient. Therefore, the turntable needs to be bonded and fixed to at least the upper surface of the rotor holder.

  On the other hand, the spindle motor is provided with an annular space for accommodating steel balls for balancing. This space is formed by closing an annular recess recessed upward from the lower side with an annular plate. The annular plate is simply fixed so as to be sandwiched between the main body of the turntable and the rotor holder. Since it is such a structure, a turntable and a rotor holder are fixed with an adhesive agent inside radial direction rather than an annular recessed part.

  Here, according to the configuration of Patent Document 1, since the labyrinth is formed with the main body of the turntable by providing the cylindrical boss portion 136a on the annular plate, the adhesive may flow into the annular space. It is prevented. However, there is a problem that the number of mold stages increases because the boss portion is formed on the annular plate.

  The main object of the present invention is to prevent the adhesive from entering the annular space when the turntable and the rotor holder are fixed with an adhesive, even if the annular plate has a simple configuration.

  A spindle motor according to an exemplary first aspect of the present invention is a spindle motor having a disk mounting portion on which a disk having a central opening is mounted, and a shaft facing vertically and an upper portion of the shaft. A cone that is slidable in the vertical direction with respect to the shaft; a turntable that is positioned below the cone in the axial direction and that has the disk mounting portion around the cone; A rotor holder having a cylindrical portion that is fixed directly to the shaft on the side or indirectly through another member and that extends in the axial direction and a lid portion that closes an upper end of the cylindrical portion; and the cylindrical portion of the rotor holder A rotor magnet fixed inside, a stator disposed inside the rotor magnet, and a bearing mechanism for rotatably supporting the shaft. The cone has a disk holding surface that is inclined downward in the radial direction, and the turntable is located above the disk mounting part and below the disk mounting part. An annular recess recessed toward the outer surface, an outer annular surface extending radially outward from the axial lower end of the radially outer inner surface of the annular recess, and an outer side extending axially downward from the radially outer edge of the outer annular surface The opposed surface, the inner annular surface that extends radially inward from the axial lower end of the radially inner inner surface of the annular recess, the radially inner side of the annular recess, the upper surface is recessed downward, A resin-made table body, a plurality of spheres arranged to be rollable in the annular recess, and the table body and the rotor holder. Under the annular recess An annular closing member that closes the opening of the rotor holder, and there is a gap between which the adhesive is interposed between the lid portion of the rotor holder and the turntable, the annular closing member is an annular flat plate, and the outer annular member The surface is in contact with the upper surface of the annular closure member, the outer facing surface is opposed to the outer peripheral surface of the annular closure member, and the inner annular surface is in contact with the upper surface of the annular closure member.

  According to the present invention, when an annular plate having a simple configuration is used, even if the turntable and the rotor holder are fixed with an adhesive, the adhesive can be prevented from entering the inside of the annular recess.

FIG. 1 is a cross-sectional view of a disk drive device. FIG. 2 is a sectional view of the spindle motor. FIG. 3 is an enlarged sectional view showing the vicinity of the turntable. FIG. 4 is a diagram illustrating a state where a disc is placed on the turntable. FIG. 5 is a cross-sectional view showing another example of the spindle motor. FIG. 6 is an enlarged sectional view showing the vicinity of a turntable in still another example of the spindle motor. FIG. 7 is an enlarged sectional view showing the vicinity of a turntable in still another example of the spindle motor. FIG. 8 is an enlarged sectional view showing the vicinity of the turntable in still another example of the spindle motor. FIG. 9 is an enlarged sectional view showing the vicinity of the turntable in still another example of the spindle motor.

  In the present specification, the upper side of FIG. 2 in the central axis direction of the spindle motor is simply referred to as “upper side”, and the lower side is simply referred to as “lower side”. Note that the vertical direction does not indicate the positional relationship or direction when incorporated in 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 “radial direction”, and a circumferential direction centered on the central axis is simply referred to as “circumferential direction”.

  FIG. 1 is a cross-sectional view of a disk drive device 80 including a spindle motor 1 according to the present invention. The disk drive device 80 includes the spindle motor 1, an optical pickup mechanism 81, a moving mechanism 82, and a housing 83 that accommodates these. The spindle motor 1 is inserted into the center opening 91 of the disk-shaped disk 9 to align the disk 9 coaxially with the center of rotation and rotate the disk 9. The optical pickup mechanism 81 records and reproduces information on the disk 9 by emitting laser light to the disk 9. The moving mechanism 82 moves the optical pickup mechanism 81 in the radial direction of the disk 9.

  The spindle motor 1 and the optical pickup mechanism 81 are held by a chassis 84. The center opening 91 of the disk 9 is attached to the chucking device of the spindle motor 1 by moving the chassis 84 upward in a state where the center of the center opening 91 of the disk 9 coincides with the center axis J1 of the spindle motor 1. . At this time, the disk 9 is clamped from above by the clamper 85.

  The moving mechanism 82 includes a motor 821 and a transmission gear 822. A transmission gear 822 is attached to the output shaft of the motor 821. The transmission gear 822 transmits the rotation of the motor 821.

  The housing 83 has an insertion port 832 through which the disk 9 is inserted and removed. A tray 86 is disposed in the housing 83. The tray 86 can be moved outside the housing 83. The disk 9 is placed on the tray 86, and the tray 86 carries the disk 9 to the spindle motor 1.

  The optical pickup mechanism 81 includes a recording / reproducing unit 811 and a moving unit 812. The recording / reproducing unit 811 emits laser light. The moving unit 812 moves the recording / reproducing unit 811 in the radial direction. The moving part 812 has a meshing part 813 that meshes with the transmission gear 822. When the motor 821 rotates, the moving unit 812 moves in the radial direction. As a result, the recording / reproducing unit 811 moves in the radial direction.

  FIG. 2 is a longitudinal sectional view of the spindle motor 1. The spindle motor 1 includes a motor unit 11 and a chucking device 12. The motor unit 11 includes a rotating unit 2 and a stationary unit 3. The rotating unit 2 rotates about the central axis J1. The stationary part 3 supports the rotating part 2 in a rotatable manner. The chucking device 12 is disposed on the upper side in the axial direction of the rotating unit 2.

  The rotating part 2 includes a substantially columnar shaft 21, a covered generally cylindrical rotor holder 22, and an annular rotor magnet 23. The shaft 21 is disposed around a central axis J1 that faces in the vertical direction. The rotor holder 22 is fixed to the shaft 21 and rotates around the central axis J1.

  The rotor holder 22 includes an outer cylindrical portion 221, a lid portion 222, and an inner cylindrical portion 223. The outer cylindrical portion 221 is a cylindrical portion that extends in the axial direction. The outer peripheral surface of the rotor magnet 23 is fixed to the inner peripheral surface of the outer cylindrical portion 221. In other words, the rotor magnet 23 is fixed inside the outer cylindrical portion 221. The rotor holder 22 is a pressed part. The lid portion 222 is a flat surface extending from the outer cylindrical portion 221 toward the central axis J1. The lid part 222 closes the upper end of the outer cylindrical part 221. The lid part 222 is located below the turntable 41 described later of the chucking device 12. The inner cylindrical portion 223 extends downward in the axial direction from the inner edge of the lid portion 222. The inner peripheral surface of the inner cylindrical portion 223 is fixed to the outer peripheral surface of the shaft 21. The rotor holder 22 does not need to be directly fixed to the shaft 21, and may be indirectly fixed to the shaft 21 via another member, for example, a member fixed to the shaft 21. Examples of other members include brass bushes and adhesives.

  The stationary part 3 includes a substantially cylindrical sleeve 31, a housing 32, a stator 33, a substantially flat mounting plate 34, and a circuit board 35. The inner peripheral surface of the sleeve 31 as a bearing mechanism supports the shaft 21 so as to be rotatable about the central axis J1. The sleeve 31 is made of a sintered material. The housing 32 has a cylindrical portion 321 and a bottom portion 322. The inner peripheral surface of the cylindrical portion 321 holds the outer peripheral surface of the sleeve 31. The bottom part 322 closes the lower part of the cylindrical part 321. The inner peripheral surface of the stator 33 is fixed to the outer peripheral surface of the cylindrical portion 321 of the housing 32. The stator 33 is disposed inside the rotor magnet 23. The outer peripheral surface of the stator 33 faces the inner peripheral surface of the rotor magnet 23 in the radial direction. The mounting plate 34 is disposed below the stator 33 in the axial direction. The mounting plate 34 has an inner peripheral surface that is fixed to the outer peripheral surface of the cylindrical portion 321 of the housing 32. The circuit board 35 is disposed on the upper surface of the mounting plate 34.

  By passing a current from an external power source (not shown) to the stator 33, the stator 33 generates a magnetic field facing the rotor magnet 23. Due to the magnetic interaction between the magnetic field and the rotor magnet 23, the rotating unit 2 obtains a rotational driving force centered on the central axis J1.

  The chucking device 12 includes a turntable 41, a cone 42, a yoke 43, a clamp magnet 44, and a coil spring 47. These are all substantially annular. The turntable 41 is fixed to the upper surface of the lid portion 222 of the rotor holder 22 with an adhesive. The turntable 41 may be fixed to the shaft 21.

  The cone 42 is disposed on the upper side in the axial direction of the turntable 41 and has a disk holding surface 421 that contacts the center opening 91 of the disk 9. The disk holding surface 421 is located on the outer periphery of the cone 42 and is inclined downward in the radial direction. The cone 42 is molded by injection molding of a resin material. The cone 42 is slidable in the vertical direction with respect to the upper portion of the shaft 21.

  The yoke 43 is disposed on the upper side in the axial direction of the cone 42 and is fixed to the shaft 21. The yoke 43 is formed of a magnetic material. The clamp magnet 44 is fixed to the upper surface of the yoke 43 using a magnetic attractive force between the yoke 43 and an adhesive. Thereby, the clamp magnet 44 is indirectly fixed to the shaft 21 via the yoke 43. The coil spring 47 is sandwiched in the vertical direction between the turntable 41 and the cone 42 around the shaft 21. In the spindle motor 1, the shaft 21 can also be regarded as a constituent member of the chucking device 12 to which the turntable 41 and the like are attached.

  The turntable 41 is located below the cone 42. As will be described later, the turntable 41 is indirectly fixed to the shaft 21 by being bonded to the rotor holder 22, but may be directly fixed to the shaft 21. The turntable 41 includes a disk mounting portion 411 around the cone 42. The disk 9 is mounted on the disk mounting portion 411. The disk mounting portion 411 includes an annular rubber 412 that is in contact with the lower surface of the mounted disk 9.

  FIG. 3 is an enlarged cross-sectional view showing the vicinity of the turntable 41. The turntable 41 includes a table body 5, a plurality of steel balls 61, and an annular plate 62. The table body 5 is molded from resin. The table body 5 includes the disk mounting portion 411 (excluding the annular rubber 412) described above and the annular recess 51. The annular recess 51 has an annular shape centered on the central axis J <b> 1 and is recessed upward on the lower side of the disk mounting portion 411. The annular recess 51 does not have to be positioned directly below the disk mounting portion 411. The annular recess 51 overlaps with the outer edge portion of the lid portion 222 of the rotor holder 22 in the vertical direction.

  The radially inner side surface of the annular recess 51 in the table body 5 is a cylindrical surface 53 that extends downward from the disk mounting portion 411. Further, the radially inner side surface of the annular recess 51 is a cylindrical surface 54 that extends downward. Hereinafter, the cylindrical surface 53 and the cylindrical surface 54 are referred to as an “outer cylindrical surface 53” and an “inner cylindrical surface 54”, respectively.

  A portion connecting the inner cylindrical surface 54 and the outer cylindrical surface 53 of the table body 5, that is, a bottom portion 55 of the annular recess 51 is a portion continuous radially inward from the disk mounting portion 411. A housing recess 56 whose upper surface is recessed downward is formed in a radially inner portion of the bottom 55 of the table body 5. The housing recess 56 is located on the radially inner side of the annular recess 51. The accommodating recess 56 can accommodate a cone therein. The lower surface of the housing recess 56 faces the rotor holder 22 in the axial direction.

  The plurality of steel balls 61 are arranged to roll in the annular recess 51, that is, in an annular space surrounded by the portion forming the annular recess 51 and the annular plate 62. The steel ball 61 may be a sphere and may be formed of a material other than iron. An annular cushion material 623 is attached to the upper surface of the annular plate 62. Thereby, while suppressing the noise accompanying the movement of the steel ball 61, the movement of the steel ball 61 can be attenuated. The annular plate 62 is an annular closing member. Here, it is desirable for the steel ball 61 to be positioned radially outside in order to correct the rotation imbalance. Therefore, it is desirable that the annular recess 51 in which the steel ball 61 is disposed be disposed on the radially outer side as much as possible.

  FIG. 4 is a diagram showing a state where the disk 9 is placed on the turntable 41. When the disk 9 is placed above the turntable 41 immediately before the disk 9 is placed, the spindle motor 1 moves upward. The clamper 85 is provided with a magnetic body 851, and a magnetic attractive force acts between the clamp magnet 44 and the magnetic body 851. As a result, the disk 9 is clamped on the disk mounting portion 411. In addition, in this embodiment, although clamped using magnetic attraction force, it is not restricted to this. For example, a spring may be connected to the clamper and clamped using the elastic force of the spring.

  At this time, the edge of the center opening 91 of the disk 9 contacts the disk holding surface 421 of the cone 42, and the cone 42 moves downward along the shaft 21. Since the cone 42 is applied with an upward force by the coil spring 47, the center of the disk 9 exactly coincides with the central axis J1.

  Returning to FIG. 3, the description will be continued. The annular plate 62 is disposed between the table body 5 and the lid portion 222 of the rotor holder 22. The annular plate 62 is an annular flat plate. The annular plate 62 is a pressed part. The plate thickness of the annular plate 62 is desirably 0.3 mm or greater and 2.0 mm or less. More preferably, it is 0.5 mm or more and 1.5 mm or less. In the present embodiment, the plate thickness of the annular plate 62 is 1.0 mm.

  In the table body 5, the outer annular surface 531 extends radially outward from the lower end in the axial direction of the outer cylindrical surface 53. The outer annular surface 531 is in contact with the upper surface of the radially outer end of the annular plate 62. The outer annular surface 531 has a substantially annular shape when viewed from the bottom. The outline of the outer end of the outer annular surface 531 and the outline of the outer end of the annular plate 62 substantially coincide with each other.

  In the table body 5, the outer facing surface 532 extends axially downward from the radially outer edge of the outer annular surface 531. The outer facing surface 532 is in contact with the outer peripheral surface of the annular plate 62. The lower end of the outer facing surface 532 is located on the lower side in the axial direction than the lower end of the annular plate 62. Further, the lower end of the outer facing surface 532 is positioned on the lower side in the axial direction than the upper surface of the lid portion 222 of the rotor holder 22.

  In the table body 5, the inner annular surface 541 extends radially inward from the axial lower end of the inner cylindrical surface 54. The inner annular surface 541 is in contact with the radially inner upper surface of the annular plate 62. The inner annular surface 541 has a substantially annular shape when viewed from the bottom. In the present embodiment, the radial width of the region where the outer annular surface 531 and the annular plate 62 face each other is narrower than the radial width of the region where the inner annular surface 541 and the annular plate 62 face each other. In addition, the radial width of the region where the inner annular surface 541 and the annular plate 62 face each other is wider than half the radial width of the annular recess 51. The radial width of the region where the inner annular surface 541 and the annular plate 62 face each other is wider than the axial thickness of the annular plate 62.

  In the table body 5, the inner facing surface 542 extends axially downward from the radially inner edge of the inner annular surface 541. In the present embodiment, the inner facing surface 542 is a cylindrical outer peripheral surface. In the present embodiment, the inner facing surface 542 is in contact with the inner peripheral surface of the annular plate 62. Specifically, the inner facing surface 542 is press-fitted into the inner peripheral surface of the annular plate 62. Therefore, the inner facing surface 542 and the inner peripheral surface of the annular plate 62 are in a press-fit relationship.

  Further, the lower surface of the annular plate 62 is in contact with the upper surface of the lid portion 222 of the rotor holder 22.

  An adhesive is interposed between the lower surface of the table body 5 and the lid portion 222 of the rotor holder 22. An adhesive is also interposed between the lower surface of the annular plate 62 and the lid portion 222 of the rotor holder 22. The surface of the adhesive is located on the radially outer side with respect to the radially inner edge of the annular plate 62. However, an adhesive may not be interposed between the lower surface of the annular plate 62 and the lid portion 222.

  Here, the radial width of the region where the inner annular surface 541 and the annular plate 62 face each other is wider than the radial width of the region where the outer annular surface 531 and the annular plate 62 face each other. Therefore, even if the adhesive for fixing the table body 5 and the rotor holder 22 enters between the inner annular surface 541 and the annular plate 62, the entered adhesive faces the inner annular surface 541 and the annular plate 62 opposite to each other. Solidify in the area to be. Therefore, it is possible to prevent the adhesive from entering the annular recess 51.

  Now, the process of assembling the turntable 41 and the rotor holder 22 will be described below. First, a shaft in which the shaft 21 and the rotor holder 22 are fixed is prepared. Also, a turntable 41 is prepared. That is, the turntable 41 is prepared in a state in which the steel ball 61 is rollably disposed in the annular recess 51 of the table body 5 and the opening of the annular recess 51 is sealed by the annular plate 62. The process of assembling the turntable 41 is as follows. First, the steel ball 61 is inserted into the annular recess 51. Next, the inner peripheral surface of the annular plate 62 is press-fitted into the inner facing surface 542. As a result, the annular plate 62 is fixed to the table body 5 and becomes the turntable 41. However, an adhesive may be applied and fixed between the inner peripheral surface of the annular plate 62 and the inner facing surface 542 or between the outer peripheral surface of the annular plate 62 and the outer facing surface 532. When an adhesive is applied between the outer peripheral surface of the annular plate 62 and the outer facing surface 532, it is desirable to provide a plurality of adhesive grooves extending in the axial direction on the outer facing surface 532.

  Next, an adhesive is applied to the inside in the radial direction of the upper surface of the lid portion 222 of the rotor holder 22 or the lower surface of the housing recess 56 of the table body 5.

  Next, the turntable 41 is inserted into the shaft 21. Specifically, the turntable 41 is inserted until the lid portion 222 of the rotor holder 22 comes into contact. As a result, the adhesive reaches the gap between the lid 222 of the rotor holder 22 and the turntable 41.

  Finally, the spread adhesive is solidified by a solidification process in which the temperature is maintained at 70 ° C. or higher for 1 hour. Thereby, the turntable 41 and the rotor holder 22 are fixed by the adhesive agent interposed in the gap between the lid portion 222 of the rotor holder 22 and the turntable 41.

  FIG. 5 is a diagram showing another example of the spindle motor 1A. In the turntable 41 </ b> A in FIG. 5, the shape of the table body 5 </ b> A is different from that of the table body 5. Other structures are almost the same as those in FIG.

  In the present embodiment, the table main body 5A does not have the inner facing surface 542. That is, the inner annular surface 541A extends to the inner end of the table body 5A. At this time, the region of the inner annular surface 541A that does not face the annular plate 62A faces the lid portion 222A of the rotor holder 22A. In the present embodiment, a wide radial width is ensured in a region where the inner annular surface 541A and the annular plate 62A face each other. Therefore, even when such a configuration is adopted, when the inner annular surface 541A, the turntable 41A, and the rotor holder 22A are fixed with an adhesive, the intruded adhesive is a region where the inner annular surface 541A and the annular plate 62A face each other. Solidify with. As a result, it is possible to prevent the adhesive from entering the annular recess 51A.

  FIG. 6 is a diagram showing still another example of the spindle motor 1B. In the turntable 41B of FIG. 6, the shape of the table body 5B is different from the table body 5 or the table body 5A. Other structures are the same as those in FIG.

  In the table main body 5B in the present embodiment, the outer peripheral surface of the inner facing surface 542B and the inner peripheral surface of the annular plate 62B are opposed to each other via a gap. Further, a concave groove 57B that opens toward the lower side in the axial direction and can accommodate an adhesive is formed on the lower surface of the accommodating concave portion 56B of the table body 5B.

  In the present embodiment, an adhesive is applied to the lower surface of the accommodating recess 56B of the table body 5B. At this time, the groove 57B on the lower surface of the housing recess 56B houses the adhesive. Therefore, most of the applied adhesive is interposed between the lower surface of the accommodation recess 56B and the lid 222B. Further, the adhesive protruding from between the lower surface of the housing recess 56B and the lid 222B is housed in the gap between the inner annular surface 541B and the lid 222B. Furthermore, even if the adhesive enters between the inner annular surface 541B and the annular plate 62B, the radial width of the region where the inner annular surface 541B and the annular plate 62B face each other is ensured. Therefore, when the turntable 41B and the rotor holder 22B are fixed with an adhesive, even if the adhesive enters the region where the inner annular surface 541B and the annular plate 62B face each other, the invaded adhesive is separated from the inner annular surface 541B. It solidifies in the region where the annular plate 62B faces. Therefore, it is possible to prevent the adhesive from entering the annular recess 51B. In the case of the present embodiment, the adhesive is accommodated in the groove 57B and the gap between the inner annular surface 541B and the lid portion 222B. Therefore, even if the radial width of the region where the inner annular surface 541B and the annular plate 62B face each other is set narrow, the adhesive can be prevented from entering the annular recess 51B. Therefore, the region where the inner annular surface 541B and the annular plate 62B face each other may be narrower than the radial width of the region where the outer annular surface 531B and the annular plate 62B face each other. Further, it may be narrower than half the radial width of the annular recess 51B.

  FIG. 7 is a diagram showing still another example of the spindle motor 1C. In the turntable 41C of FIG. 7, the shape of the table body 5C is different from the table body 5, the table body 5A, or the table body 5B. Other structures are the same as those in FIG.

  In the present embodiment, the table body 5C has a protrusion 543C that protrudes downward in the axial direction on the radially inner side of the inner annular surface 541C. The protrusion 543C has an annular shape surrounding the central axis J1. The protrusion 543C is in contact with the lid 222C of the rotor holder 22C. The inner annular surface 541C has an annular groove 544C that opens downward. An adhesive is interposed between the lid portion 222C of the rotor holder 22C and the table body 5C.

  In the present embodiment, the adhesive is applied to the lower surface of the protrusion 543C or a region inside the protrusion 543C. Thereby, when the turntable 41C and the rotor holder 22C are assembled, the adhesive is accommodated inside the projection 543C and in the vicinity of the projection 543C. In other words, the adhesive is located on the radially inner side with respect to the radially outer end of the protrusion. Thereby, it is possible to prevent the adhesive from entering the annular recess 51C. Further, the inner annular surface 541C has a concave groove 544C. Therefore, even if the adhesive enters the region where the inner annular surface 541C and the annular plate 541C face each other, the adhesive is accommodated in the concave groove 544C. Therefore, it is possible to prevent the adhesive from entering the annular recess 51C.

  In the present embodiment, when the turntable 41C and the rotor holder 22C are assembled, the adhesive is solidified in a state where the protrusion 543C is abutted against the lid 222C. That is, the protrusion 543C is used for positioning. Therefore, if the accuracy of the protrusion 543C is improved, the position accuracy of the turntable 41C with respect to the rotor holder 22C can be improved. Compared with the case where the entire surface of the table body is abutted, it is easy to improve accuracy.

  FIG. 8 is a diagram showing still another example of the spindle motor 1D. In the turntable 41D of FIG. 8, the shape of the table body 5D is different from the table body 5, the table body 5A, the table body 5B, or the table body 5C. Other structures are the same as those in FIG.

  In the present embodiment, the protrusion includes a radially inner protrusion 543D1 and a radially outer protrusion 543D2. The inner annular surface 541D has a concave groove 544D. The protrusions 543D1 are a plurality of portions arranged at intervals in the circumferential direction. In addition, the shape of each protrusion part 543D1 is a rectangular shape or fan shape in bottom view. However, the protrusion 543D1 is not limited to this shape, and may be, for example, an annular shape.

  The radially outer projection 543D2 is a portion that is annularly arranged with the central axis J1 as the center. The protrusions 543D1 and 543D2 have substantially the same axial height. The lower surfaces of the protrusions 543D1 and 543D2 are in contact with the lid part 222D of the rotor holder 22D. The protrusion 543D2 is in contact with the lid 222D of the rotor holder 22D over the entire circumference. An adhesive is interposed in a gap formed between the protrusion 543D1 and the protrusion 543D2 and the lid 222D of the rotor holder 22D. Then, the table body 5D and the rotor holder 22D are fixed by interposing an adhesive between the lower surface of the housing recess 56D and the lid portion 222D of the rotor holder 22D.

  Below, the process of assembling turntable 41D and rotor holder 22D is demonstrated. First, a shaft in which the shaft 21D and the rotor holder 22D are fixed is prepared. Also, a turntable 41D is prepared. That is, a turntable 41D is prepared in a state in which a steel ball 61D is rollably disposed in an annular recess 51D of the table body 5D and the opening of the annular recess 51D is sealed by the annular plate 62D.

  The process of assembling the turntable 41D is as follows. First, the steel ball 61D is inserted into the annular recess 51D. Next, the annular plate 62D is fixed to the inner annular surface 541D. Specifically, an adhesive is applied to the region facing the inner annular surface 541D of the annular plate 62D or the lower surface of the inner annular surface 541D. Then, the inner annular surface 541D is brought into contact with the upper surface of the annular plate 62D. Here, a concave groove 544D is formed on the lower surface of the inner annular surface 541D. The adhesive pushed out by the contact between the inner annular surface 541D and the annular plate 62D is accommodated in the concave groove 544D. Therefore, the adhesive is prevented from entering the annular recess 51D. Thereafter, the adhesive interposed between the inner annular surface 541D and the annular plate 62D is solidified. As a result, a solidified adhesive layer is formed between the inner annular surface 541D and the annular plate 62D. As a result, the annular plate 62D is fixed to the table body 5D and becomes the turntable 41D. However, an adhesive may be applied and fixed between the inner peripheral surface of the annular plate 62D and the inner facing surface 542D, or between the outer peripheral surface of the annular plate 62D and the outer facing surface 532D.

  Next, an adhesive is applied to the protrusion 543D1.

  Next, the turntable 41D and the rotor holder 22D are brought into contact with each other. Specifically, the lower surfaces of the protrusions 543D1 and 543D2 are brought into contact with the lid 222D of the rotor holder 22D. At this time, the adhesive applied to the protruding portion 543D1 is pushed out by the lower surface of the protruding portion 543D1 and the lid portion 222D, and moves to the outer side in the radial direction between the protruding portions 543D1 and between the protruding portions 543D1. To do. At this time, the protrusion 543D2 and the lid 222D are in contact with each other. Therefore, the protruding portion 543D2 prevents the adhesive from moving radially outward. Accordingly, the protrusion 543D2 prevents the adhesive from entering the annular recess 51D.

  Furthermore, even if the adhesive moves to the outside in the radial direction of the protrusion 543D2, a solidified adhesive layer is formed at a location where the annular plate 62D and the inner annular surface 541D face each other. Therefore, the adhesive is prevented from moving radially outward by the solidified adhesive layer. Therefore, the adhesive does not enter the annular recess 51D. If the adhesive does not move to the outside in the radial direction of the protrusion 543D2, the surface of the adhesive that bonds the table main body 5D and the lid 222D and the annular plate 62D and the table main body 5D or the lid 222D are bonded. Away from the surface of the adhesive.

  Thereafter, the spread adhesive is solidified by a solidification step of holding at a temperature of 70 ° C. or higher for 1 hour. Thereby, turntable 41D and rotor holder 22D are fixed with the adhesive agent which intervenes in the clearance gap between lid part 222D of rotor holder 22D, and turntable 41D.

  FIG. 9 is a diagram showing still another example of the spindle motor 1E. In the turntable 41E of FIG. 9, the shape of the annular plate 62E is different from the annular plate 62, the annular plate 62A, the annular plate 62B, the annular plate 62C, or the annular plate 62D. Other structures are the same as those in FIG.

  In the present embodiment, the annular plate 62E has a substantially flat plate shape. The annular plate 62E has a flat plate portion 621E and a bent portion 622E that is bent at the radially inner end and the radially outer end of the flat plate portion 621E. In the present embodiment, the bent portion 622E is a substantially cylindrical portion that hangs downward from the flat plate portion 621E in the axial direction. However, the bent portion 622E may extend from the flat plate portion 621E to the upper side in the axial direction. Further, the bending direction may be different between the radially inner side and the radially outer side. Further, the bent portion 622E may be only on the radially inner side. Even if it forms in this way, an annular plate can be obtained easily. In the present embodiment, the outer peripheral surface of the inner bent portion 622E is press-fitted into the inner facing surface 542E. Thereby, the annular plate 62E can be fixed to the table body 5E. Also with such a configuration, it is possible to prevent the adhesive from entering the annular recess 51E.

  As mentioned above, although the Example of this invention was described, this invention is not limited to the said embodiment, A various deformation | transformation is possible.

  For example, the lower surface of the annular plate and the lid portion of the rotor holder may be in contact with each other or there may be a gap.

  In the chucking device 4, an elastic member such as a resin may be used instead of the coil spring 47 as a pressing portion that presses the cone 42 upward. If the cone 42 receives the force from the disk 9 and moves downward, it does not necessarily have to be pressed upward. For example, the cone 42 may be drawn toward the clamper 85.

  In the spindle motor 1, for example, a ball bearing may be used instead of the sleeve 31 as a bearing mechanism that rotatably supports the shaft 21. The optical pickup mechanism 81 of the disk drive device 80 may be provided with a recording / reproducing unit that performs at least one of optical recording and reproduction with respect to the disk 9.

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

  INDUSTRIAL APPLICABILITY The present invention can be used as a spindle motor of a disk drive device that records information or rotates disks of various standards on which information is recorded.

DESCRIPTION OF SYMBOLS 1 Spindle motor 5 Table main body 21 Shaft 22 Rotor holder 23 Rotor magnet 31 Sleeve 33 Stator 41 Turntable 42 Cone 51 Annular recessed part 52 Adhesive holding recessed part 53 Inner cylindrical surface 54 Outer cylindrical surface 56 Accommodating recessed part 57 Recessed groove 61 Steel ball 62 Annular plate DESCRIPTION OF SYMBOLS 80 Disc drive device 81 Optical pick-up mechanism 82 Moving mechanism 221 Cylindrical portion (of rotor holder) 222 Lid portion 411 Disc placement portion 421 Disc holding surface 531 Outer annular surface 532 Outer facing surface 541 Inner annular surface 542 Inner flat plate surface 543 Projection portion 544 Concave groove 621 Flat plate part 622 Bending part 631 Cylindrical part J1 Central axis

Claims (25)

A spindle motor having a disk mounting portion on which a disk having a central opening is mounted,
A shaft facing up and down,
A cone located at the top of the shaft and slidable in the vertical direction with respect to the shaft;
A turntable positioned below the cone in the axial direction and having the disk mounting portion around the cone;
A rotor holder having a cylindrical portion that is fixed directly or indirectly to the shaft on the lower side of the turntable or via another member and that extends in the axial direction and a lid portion that closes the upper end of the cylindrical portion;
A rotor magnet fixed to the inside of the cylindrical portion of the rotor holder;
A stator disposed inside the rotor magnet;
A bearing mechanism for rotatably supporting the shaft;
With
The cone has a disk holding surface that inclines in a downward direction as it progresses radially outward,
The turntable is
The disk mounting unit;
An annular recess recessed upward from below the disk mounting portion;
An outer annular surface extending radially outward from the axial lower end of the radially outer inner surface of the annular recess;
An outer facing surface extending axially downward from a radially outer edge of the outer annular surface;
An inner annular surface extending radially inward from the axial lower end of the radially inner inner surface of the annular recess;
A resin-made table main body, which is located on the radially inner side from the annular recess, the upper surface of which is recessed downward, and which can receive the cone.
A plurality of spheres arranged to roll in the annular recess;
An annular closing member that is disposed between the table body and the rotor holder and closes the lower opening of the annular recess;
There is a gap between which the adhesive is interposed between the lid portion of the rotor holder and the turntable,
The annular closure member is an annular flat plate, the outer annular surface is in contact with the upper surface of the annular closure member, and the outer facing surface is opposed to the outer peripheral surface of the annular closure member;
The spindle motor, wherein the inner annular surface is in contact with the upper surface of the annular closing member.   2. The spindle motor according to claim 1, wherein at least a part of the surface of the adhesive is located radially outside the radially inner edge of the annular closing member.   3. The spindle motor according to claim 1, wherein the table body further includes an inner facing surface extending downward in the axial direction from a radially inner edge of the inner annular surface.   The spindle motor according to claim 3, wherein the inner facing surface and the inner peripheral surface of the annular closing member are in a press-fit relationship.   4. The spindle according to claim 3, wherein a radial width of a region where the outer annular surface and the annular blocking member face each other is narrower than a radial width of a region where the inner annular surface and the annular blocking member face each other. motor.   The spindle motor according to claim 3, wherein a radial width of a region where the inner annular surface and the annular blocking member face each other is wider than half of a radial width of the annular recess.   The spindle motor according to claim 3, wherein a radial width of a region where the inner annular surface and the annular closing member face each other is wider than an axial thickness of the annular closing member. The outer facing surface has a plurality of adhesive grooves extending in the axial direction.
The spindle motor according to claim 1.   The spindle motor according to claim 1, wherein a lower end of the outer facing surface is positioned on an axial lower side than a lower end of the annular closing member.   The spindle motor according to claim 1, wherein the inner annular surface has a groove that opens downward in the axial direction.   The spindle motor according to claim 1, wherein a thickness of the annular closing member in an axial direction is not less than 0.3 mm and not more than 2.0 mm.   The spindle motor according to claim 1, wherein a thickness of the annular closing member in an axial direction is not less than 0.5 mm and not more than 1.5 mm.   The spindle motor according to claim 1, wherein the annular closing member is a pressed part.   The spindle motor according to claim 1, wherein a surface of the adhesive is located radially inward of the annular closing member. The table main body further includes a protrusion that protrudes downward in the axial direction on the radially inner side of the inner annular surface.
The spindle motor according to claim 1. The protrusion is an annular shape surrounding the central axis and contacts the lid of the rotor holder over the entire circumference.
The spindle motor according to claim 15. The protrusion contacts the lid of the rotor holder;
The spindle motor according to claim 15. The protrusion includes a radially inner protrusion and a radially outer protrusion,
The spindle motor according to claim 15, wherein the radially outer protrusion is annular.   The spindle motor according to claim 15, wherein the adhesive is located radially inward from a radially outer end of the protrusion.   2. The spindle motor according to claim 1, wherein a lower surface of the housing recess has a groove that opens toward the lower side in the axial direction and can accommodate an adhesive.   The spindle motor according to claim 1, wherein the surface of the adhesive that bonds the table body and the lid portion and the surface of the adhesive that bonds the annular closing member and the table body or the lid portion are separated from each other. .   The spindle motor according to claim 1, wherein the annular closing member has a flat plate portion and a bent portion bent at a radially inner end of the flat plate portion.   The spindle motor according to claim 1, wherein a lower surface of the annular closing member and the lid portion of the rotor holder are in contact with each other.   The spindle motor according to claim 1, wherein there is a gap between a lower surface of the annular closing member and the lid portion of the rotor holder.   25. The spindle motor according to claim 24, wherein an adhesive is interposed in a gap between the lower surface of the annular closing member and the lid portion of the rotor holder.

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