JP2013025857A - Optical disk drive motor and optical disk drive device including the motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk drive device capable of preventing increase of floating amount of a rotation part due to a high speed rotation of an optical disk.SOLUTION: The optical disk drive device includes an optical disk drive motor. The optical disk drive motor has a suction magnet disposed between a rotor holder and a bushing. The rotor holder has a projection formed so that a portion of which is overlapped with the suction magnet in an axis direction. The rotor holder and the bushing are formed of a magnetic material and constitute a part of a magnetic circuit. With this, the optical disk drive motor prevents floating of the rotation part and reduces shaft damage.

Description

  The present invention relates to an optical disk driving motor and an optical disk driving apparatus including the optical disk driving motor. More specifically, the present invention relates to an optical disk drive motor that can suppress the floating of the rotating part and reduce axial loss during high-speed rotation of the motor, and an optical disk drive device including the optical disk drive motor.

  An optical disk drive used for reading and / or writing information on a data recording optical disk (hereinafter simply referred to as an optical disk) such as a CD and a DVD includes an optical disk drive motor. As shown in FIG. 4, Chinese Patent Application Publication No. 1747028 discloses a conventional optical disk drive motor. Depending on whether the motor rotates during driving, the constituent members of the optical disk driving motor are divided into a stationary part and a rotating part. The stationary part includes a frame 102, a substantially cylindrical bush 104 attached to the opening of the frame 102, a sleeve 106 accommodated in the bush 104, and a stator 110 fixed to the outer peripheral surface of the bush 104. The rotating unit includes a shaft 108 that is rotatably supported by the sleeve 106, a rotor holder 112 that is fixed to an upper portion in the axial direction of the shaft 108, and a disc that is fixed to the shaft 108 above the rotor holder 112 and supports and holds the optical disc 150. Holder 120. A rotor magnet 114 is fixed to the inner peripheral surface of the rotor holder 112. The optical disk drive motor is driven by the action of magnetic flux between the stator 110 and the rotor magnet 114.

The disc holder 120 has a centering case 122 fixed to the shaft 108 and a turntable 124 formed integrally with the centering case 122 around it. An optical disk 150 is placed on the turntable 124. The centering case 122 includes a hole 123 formed therein, an alignment claw 126 used to align the optical disk 150 placed on the tartan table 124 with the rotation center of the rotating unit, and the elastic force of the coil spring 127. And a claw-shaped chuck 128 that suppresses the axial movement of the optical disk 150 placed on the turntable 124. Further, the rotor holder 112 has a protrusion 116 protruding upward in the axial direction. The protrusion 116 faces the base of the chuck 128 and has a small gap between them. Accordingly, the holding force of the optical disk can be increased by restricting the downward movement of the chuck 128 in the axial direction.
Chinese Patent Application No. 1747028

  By the way, as the reading and / or writing speed of an optical disc such as a CD or DVD increases, the rotational speed of the optical disc and the optical disc driving motor becomes higher. When the optical disk drive motor rotates the optical disk at high speed, the flying force of the optical disk increases, and there is a problem that the floating amount of the rotating part increases accordingly.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an optical disk drive motor that suppresses floating of a rotating part.

  An exemplary optical disc driving motor of the present invention includes a shaft, a sleeve into which the shaft is inserted and rotatably supporting the shaft, a bush formed by press working with a magnetic material, and housing the sleeve; A substantially disc-shaped cover portion fixed to the upper portion of the shaft in the axial direction and extending in the radial direction, a substantially annular protrusion extending from the upper surface of the cover portion to the upper side in the axial direction, and a lower portion from the radially outer portion of the cover portion A rotor holder formed by pressing with a magnetic material, a lid fixed to the shaft, and located on the radially outer side of the lid, integrated with the lid A turntable positioned above the rotor holder, a stator held on the outer peripheral surface of the bush, and a radial direction A rotor magnet which is opposed to the stator via a gap and is held on the inner peripheral surface of the peripheral wall portion, a radially outer surface and a radially inner surface, and between the rotor holder and the bush A suction magnet that is disposed and partially overlaps the projection in the radial direction, the cover has an upper surface and a lower surface, the lid has a cavity formed inside thereof, and the projection The part is disposed in the cavity.

  An attraction magnet is provided between the rotor holder and the bush, and a protrusion is provided on the rotor holder so that a portion of the attraction magnet overlaps in the radial direction. And a rotor holder and a bush comprise a part of magnetic circuit by forming a rotor holder and a bush with a magnetic material. The optical disk drive motor of the present invention can suppress the floating of the rotating part and can reduce axial loss. Therefore, the optical disk driving motor of the present invention is particularly applied to high-speed driving of optical disks.

  Furthermore, an optical disk drive apparatus according to the present invention includes the optical disk drive motor.

FIG. 1 is a cross-sectional view of an optical disk drive apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of an optical disk driving motor according to an embodiment of the present invention. FIG. 3 is a partially enlarged view of the upper part of the optical disk drive motor of FIG. FIG. 4 is a cross-sectional view of a conventional optical disk drive motor.

  Embodiments of an optical disk drive motor according to the present invention will be specifically described below with reference to the drawings. In all the drawings, the same symbols are used for the same members or similar configurations. The following embodiments and drawings are merely illustrative and are not intended to limit the scope of the present invention.

  Expressions indicating directions such as up and down and inside and outside referred to in this specification are used to exemplify embodiments based on the orientation of the drawings. Therefore, the installation posture when the optical disk drive motor and the disk drive device of the present invention are mounted on an actual device is not limited.

(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 56 about a central axis X. As shown in FIG. 1, the disk drive device 1 includes a housing 11, a disk tray 15, an optical disk drive motor 13 (hereinafter simply referred to as a motor 13), and an access unit 17.

  The housing 11 is box-shaped. The housing 11 has a top plate portion. The top plate portion is a substantially flat plate member that extends in the radial direction. The housing 11 accommodates the disk tray 15, the motor 13, and the access unit 17 therein. The top plate is disposed above the disk tray 15, the motor 13, and the access unit 17. The disk tray 15 slides between the outside and the inside of the housing 11, thereby loading and unloading the disk 56. The motor 13 accommodated in the housing is fixed to the disc tray 15. The disk 56 is held by the rotating portion 33 of the motor 13 and is rotated about the central axis X by the motor 13.

  The access unit 17 has a head 17a including an optical pickup function. The head 17a is an optical pickup mechanism. The access unit 17 reads and writes information by moving the head 17a along the recording surface of the disk 56 rotated by the motor 13. Note that the head 17 a of the access unit 17 may perform only one of reading and writing of information with respect to the recording surface of the disk 56.

(Motor configuration)
FIG. 2 is a cross-sectional view of the motor 13 in an exemplary embodiment of the invention. FIG. 3 is an enlarged cross-sectional view of the upper portion of the motor 13 in FIG. Hereinafter, description will be given based on FIG. 2 and FIG.

  The motor 13 includes a stationary part 43 and a rotating part 33. The stationary part 43 includes the mounting plate 2, the bush 4, the sleeve 8, and the stator 10. The mounting plate 2 has a circular hole 2a. The bush 4 is formed by pressing with a magnetic material (for example, iron or stainless steel). The bush 4 has a cylindrical body, the upper end is open, and the lower end is sealed by the bottom wall 6. That is, the bush 4 is a bottomed substantially cylindrical member. The sleeve 8 is a substantially cylindrical member, and the shaft 12 is inserted therein. The sleeve 8 is held inside the bush 4. The stator 10 is held on the outer peripheral surface of the bush 4. The lower part of the cylindrical body is attached to the surface constituting the circular hole 2a. The stator 10 is located above the mounting plate 2.

  The rotating unit 33 includes the shaft 12, the rotor holder 14, and the turntable 16. The shaft 12 is rotatably supported by the sleeve 8. The rotor holder 14 is formed by press working with a magnetic material (for example, iron), and is fixed to the upper part of the shaft 12 in the axial direction. The rotor holder 14 is fixed to the upper part of the shaft 12 in the axial direction, and supports and holds the removable optical disk 56. The lower end of the shaft 12 is supported by the bottom wall 6 of the bush 4 so as to slide and rotate.

  The rotor holder 14 has a cover part 14a and a peripheral wall part 14b. The cover portion 14a is a substantially disk-shaped portion that extends in the radial direction and has a radially inner portion and a radially outer portion. The peripheral wall portion 14b is a portion that extends downward from the radially outer portion of the cover portion 14a. The cover part 14a has an upper surface and a lower surface. The rotating part 33 further has a rotor magnet 18 held on the inner peripheral surface of the peripheral wall part 14b. The rotor magnet 18 faces the stator 10 held by the bush 4 via a gap in the radial direction. The rotation axis of the rotation unit 33 is substantially coaxial with the center rotation axis X.

  The rotor holder 14 further includes an annular protrusion 32 that protrudes upward in the axial direction from the upper surface of the cover portion 14a. The protrusion 32 is formed in the process of forming the rotor holder 14. The protrusion 32 may be formed in an arc shape or the like. In FIG. 3, the protrusion 32 has an upper side and a lower side. The upper surface of the protrusion 32 has a first upper end surface 32a, a first radial inner side surface 32b, and a first radial outer side surface 32c. The lower surface of the protrusion 32 has a second upper end face 32d, a second radially inner side face 32e, and a second radially outer face 32f. The first radial inner side surface 32b, the second radial inner side surface 32e, the second radial outer side surface 32f, and the first radial outer side surface 32c are sequentially arranged from the inner side toward the outer side in the radial direction. . That is, the first upper end surface 32a is located on the upper side in the axial direction from the upper surface of the cover portion 14a. The first upper end surface 32a and the second upper end surface 32d are sequentially arranged from the upper side to the lower side in the axial direction.

  The turntable 16 is located above the rotor holder 14. The turntable 16 includes a lid portion 20 that is fixed to the shaft 12 and a disk placement portion 22 that is formed integrally with the lid portion 20. As shown in FIG. 3, the lid portion 20 has a fixing portion 25 that is fixed to the shaft 12. The fixing portion 25 is in contact with the shaft 12 and has a lowermost end A that is fixed and a radially outer surface 25a. The lid 20 may be fixed to the shaft 12 using an adhesive. Further, there is a gap between the upper surface of the cover portion 14 a and the lowermost end A of the fixing portion 25 of the lid portion 20. The disk mounting portion 22 is located on the radially outer side of the lid portion 20. The disk mounting part 22 may contact the upper surface of the cover part 14 a of the rotor holder 14. Furthermore, the disk mounting part 22 may be fixed to the upper surface of the cover part 14a with an adhesive or the like. Thereby, the rigidity of a disk mounting part can be enlarged. Of course, a minute gap may be provided between the disc mounting portion 22 and the upper surface of the cover portion 14a. The first radial direction outer side surface 32c of the protruding portion 32 faces the disc mounting portion 22, and a gap may be provided between them. The lowermost end A of the fixing portion 25 of the lid portion 20 may be positioned on the lower side in the axial direction as compared with the first upper end surface 32a of the protruding portion 32. A gap may be provided between the first radially inner side surface 32 b of the protruding portion 32 and the radially outer side surface 25 a of the fixing portion 25 of the lid portion 20. The buffer material 24 is attached to the upper surface of the disk mounting portion 22 and is in direct contact with the optical disk 56. When the optical disc 56 is placed on the disc placement portion 22, the outer diameter of the lid portion 20 is such that the lid portion 20 is positioned radially inside the center hole 56 a of the optical disc 56. Designed slightly smaller than the smallest dimension within the tolerance range. The lid 20 has a cavity 23, a plurality of alignment claws 26, and a plurality of chuck claws 28. The cavity 23 is formed inside the lid portion 20. The alignment claw 26 is used to align the center of the optical disk 56 placed on the disk placement unit 22 and the rotation axis center of the rotation unit 33. The chuck claw 28 is used to suppress the movement of the optical disk 56 attached to the disk mounting portion 22 in the axial direction. The protrusion 32 is disposed in the cavity 23.

  In the present embodiment, the lid portion 20 includes three alignment claws 26 that are arranged at regular intervals in the circumferential direction and three chuck claws 28 that are arranged at regular intervals in the circumferential direction. Further, the alignment claws 26 and the chuck claws 28 are alternately arranged along the circumferential direction of the lid portion 20. Each alignment claw 26 is formed integrally with the upper end portion of the lid portion 20 and extends radially outward, and extends from the radially outer end of the circular portion 26a to the radially outer side, and at the same time, And a curved portion 26b extending downward in the direction. The curved portion 26b may be formed in an arc shape. The lower end portion of the curved portion 26 b slightly protrudes radially outward from the outer peripheral surface of the lid portion 20. The radius of the imaginary circle connecting the lower ends of the alignment claws 26 is designed to be slightly larger than the maximum radius within the tolerance range of the center hole of the optical disk.

  The chuck claw 28 is a member independent of the turntable 16 and has an upper slope 28a, a lower slope 28b, and a lower end face 28c. The upper inclined surface 28a extends from the upper surface while being inclined axially downward and radially outward. The lower slope 28b extends from the radially outer end of the upper slope 28a while inclining radially inward and axially downward. A part of the chuck claw 28 is accommodated in the cavity 23 of the lid 20. The chuck pawl 28 is installed so as to be pressed radially outward by the coil spring 30. The coil spring 30 has a radially inner end portion that contacts the lid portion 20 and a radially outer end portion that contacts the chuck pawl 28, and is accommodated in the cavity 23. As a result, the chuck pawl 28 moves radially inward when the coil spring 30 is compressed in the radial direction. The chuck claw 28 moves radially outward by the spring back of the coil spring 30. By the way, a part of the lower inclined surface 28b of the chuck claw 28 comes into contact with the side wall portion of the lid portion 20, thereby restricting the movement of the chuck claw 28 to the outside in the radial direction. By pressing the optical disk 56 downward in the axial direction, the lower end edge of the surface constituting the central hole 56a of the optical disk 56 applies pressure to the upper inclined surface 28a of the chuck claw 28 when the optical disk 56 is attached. The chuck claw 28 moves inward in the radial direction by a radial component of the pressure. The lower end edge of the surface constituting the center hole 56 a of the optical disk 56 is aligned to be coaxial with the shaft 12 by sliding on the upper inclined surface 28 a and the bent portion 26 b of the alignment claw 26. After the lower end edge of the surface constituting the center hole 56 a of the optical disk 56 passes through the upper slope 28 a, the chuck pawl 28 is moved radially outward by the spring back of the coil spring 30. At this time, the lower inclined surface 28 b of the chuck claw 28 slides on the upper edge of the surface constituting the center hole 56 a of the optical disk 56. The optical disk 56 slides on the chuck claw 28 and slides on the curved portion 26 b of the alignment claw 26. The distances connecting the curved portions 26b of the three alignment claws 26 and the central axis X are equal at any position in the axial direction of the three alignment claws 26. Therefore, each of these three alignment claws 26 can uniformly press the surface constituting the center hole 56a of the optical disk 56 outward in the radial direction. Thereby, the optical disk 56 and the rotating part 33 are aligned. After the optical disk 56 is attached to the rotating part 33, the lower inclined surface 28 b of the chuck claw 28 presses the optical disk 56 from the upper side in the axial direction by the spring back of the coil spring 30. As a result, clamping to the optical disk 56 is realized. The movement of the optical disk 56 will be described below.

  The motor 13 of the present invention further has a suction magnet 34. The attraction magnet 34 has a radially outer side surface 34a and a radially inner side surface 34b (see FIG. 3). Further, the attraction magnet 34 is disposed between the rotor holder 14 and the bush 4 and partially overlaps the protrusion 32 in the axial direction. As shown in FIG. 2, the attracting magnet 34 is fixed to the lower surface of the cover portion 14 a of the rotor holder 14 so as to partially overlap the protruding portion 32 in the axial direction. The suction magnet 34 is disposed on the lower surface of the cover portion 14 a of the rotor holder 14, and the suction magnet 34 partially overlaps the protrusion 32 in the axial direction, thereby generating between the radially outer portion of the suction magnet 34 and the bush 4. The density of magnetic flux to be reduced. As a result, it is possible to reduce the axial loss while suppressing the floating of the rotating portion 33.

  The rotor holder 14 has a cylindrical portion 38 extending from the radially inner side of the cover portion 14a to the lower side in the axial direction. The rotor holder 14 is fixed to the shaft 12 by the cylindrical portion 38. The cylindrical portion 38 has an outer peripheral surface 38a (see FIG. 3). The attraction magnet 34 may be disposed so as to be positioned on the radially outer side of the cylindrical portion 38 of the rotor holder 14. Further, a gap is formed between the radially inner side surface 34 b of the attracting magnet 34 and the outer peripheral surface 38 a of the cylindrical portion 38 of the rotor holder 14.

  The bush 4 has a cylindrical main body. The cylindrical main body has a flange 36 that extends radially outward from the axial upper end. The flange 36 has an upper surface and a radially outer surface 36a (see FIG. 3). The attracting magnet 34 may be arranged and fixed on the upper surface of the flange 36. In this case, the attracting magnet 34 partially overlaps the protruding portion 32 in the axial direction. The attraction magnet 34 is disposed on the upper surface of the flange 36 of the bush 4, and the attraction magnet 34 partially overlaps the protrusion 32 in the axial direction, whereby the resistance of the magnetic flux between the radially outer portion of the attraction magnet 34 and the rotor holder 14 is increased. growing. As a result, it is possible to reduce the axial loss while suppressing the floating of the rotating portion 33.

  Further, the radially outer surface 36 a of the flange 36 may be positioned more radially outward than the radially outer surface 34 a of the attracting magnet 34. The radially outer surface 36a of the flange 36 may be positioned more radially outward than the second radially inner surface 32e of the protruding portion 32.

  As described above, the attraction magnet 34 may be disposed on the rotating unit 33 or the stationary unit 43. An attraction magnet 34 is disposed between the rotor holder 14 and the bush 4 formed of a magnetic material, and the protrusion 32 and the attraction magnet 34 partially overlap in the axial direction. The float can be suppressed and the axial loss can be reduced.

  The first upper end surface 32a of the protrusion 32 directly contacts the lower end surface 28c of the chuck claw 28, or the first upper end surface 32a faces the lower end surface 28c via an axial gap. By providing the protrusion 32, the motor 13 of the present invention can increase the holding force of the chuck pawl 28 against the optical disk 56. Further, when the coil spring 30 is pressed, the coil spring 30 itself bends downward in the axial direction, whereby the optical disk 56 is correctly attached. When the coil spring 30 is bent downward in the axial direction, the coil spring 30 does not protrude downward from the cavity 23 by contacting the first upper end surface 32a. Hereinafter, the process of removing the optical disk 56 will be described. When the optical disk 56 moves upward, the upper edge of the surface constituting the center hole 56a of the optical disk 56 moves upward in the axial direction. At the same time, the lower claw 28b of the chuck claw 28 is slid. At this time, the chuck pawl 28 rotates in response to the radially inward pressure from the optical disk 56. That is, the chuck claw 28 rotates its outer end toward the upper side in the axial direction and its inner end toward the lower side in the axial direction. However, the lower end surface 28c of the chuck claw 28 is in direct contact with the first upper end surface 32a of the protrusion 32, or is opposed to the first upper end surface 32a via a minute axial gap, so Movement to the side is restricted. In a state where the chuck claw 28 and the protruding portion 32 are in contact with each other, the lower end surface 28c moves radially inward and slides on the first upper end surface 32a of the protruding portion 32. As a result, when the chuck pawl 28 moves radially inward due to the pressure from the surface constituting the center hole 56a of the optical disk 56, the optical disk 56 moves upward in the axial direction. When the lower edge of the surface constituting the central hole 56 a of the optical disk 56 passes through the outermost part of the chuck claw 28, the optical disk 56 is removed from the rotating part 33 of the motor 13. Further, the chuck pawl 28 moves outward in the radial direction by the spring back of the coil spring 30. The movement range of the chuck claw 28 is limited by the protrusion 32, and the elastic force in the radial direction of the coil spring 30 is given to the surface constituting the center hole 56 a of the optical disk 56 by the chuck claw 28. For this reason, compared with the conventional structure, the motor 13 of the present invention can increase the holding force for the optical disk 56. This prevents the optical disk 56 from being detached from the rotating unit 33 due to centrifugal force or external vibration during motor rotation.

  This embodiment has the following advantages.

  In the motor 13 of the present embodiment, a suction magnet 34 is disposed between the rotor holder 14 formed of a magnetic material and the bush 4, and the protrusion 32 and the suction magnet 34 partially overlap in the axial direction. Thereby, an axial loss can be reduced, suppressing the floating of the rotation part 33. FIG.

  In the motor 13 of the present embodiment, the protrusion 32 has an upper surface and a lower surface, and the upper surface of the protrusion 32 includes a first upper end surface 32a, a first radial inner surface 32b, and a first radial direction. An outer side surface 32c, the lower side surface of the protrusion 32 has a second radial inner side surface 32d, a first radial inner side surface radial inner side surface 32b, a second radial inner side surface 32d and a first diameter. The direction outer side surface 32c is arranged sequentially from the inner side toward the outer side in the radial direction. When the coil spring 30 of the turntable 16 is pressed, the protrusion 32 bends downward in the axial direction so that the optical disk 56 is correctly attached.

  In the motor 13 of the present embodiment, the bush 4 has a cylindrical main body portion, and the cylindrical main body portion has a flange 36 that extends radially outward from the upper end in the axial direction. The attraction magnet 34 is disposed on the lower surface of the cover portion 14 a of the rotor holder 14. Alternatively, the attracting magnet 34 is disposed on the upper surface of the flange 36. Accordingly, proper positioning of the attracting magnet 34 can be realized.

  In the motor 13 of the present embodiment, the first radially outer side surface 32c of the protrusion 32 faces the disc mounting portion 22 via a gap. Thereby, the coaxiality of the disk mounting part 22 and the rotor holder 14 can be improved.

  In the motor 13 of this embodiment, the disk mounting portion 22 is in contact with the upper surface of the cover portion 14 a of the rotor holder 14. By arranging the rotor holder 14 so as to be in contact with the disk mounting portion 22, high rigidity can be obtained.

  In the motor 13 of the present embodiment, the radially outer surface of the flange 36 is positioned more radially outward than the radially outer surface of the attracting magnet 34. As a result, leakage of magnetic flux from the stator can be reduced, and an appropriate magnetic attractive force can be obtained.

  In the motor 13 of the present embodiment, the radially outer surface of the flange 36 is positioned more radially outward than the second radially inner surface 32d of the protrusion 32. As a result, leakage of magnetic flux from the stator can be reduced, and an appropriate magnetic attractive force can be obtained.

  In the motor 13 of this embodiment, the rotor holder 14 has a cylindrical portion 38 that extends from the radially inner side of the cover portion 14 a to the axially lower side, and the rotor holder 14 is fixed to the shaft 12 by the cylindrical portion 38. As a result, the axial length of the portion fixed to the shaft 12 of the rotor holder 14 and the axial length of the portion fixed to the shaft 12 of the disk mounting portion 22 can be ensured. As a result, the rotor holder 14 and the disk mounting portion 22 are firmly fixed to the shaft 12.

  In the motor 13 of the present embodiment, the suction magnet 34 is disposed so as to be located on the radially outer side of the cylindrical portion 38 of the rotor holder 14. There is a gap between the radially inner side surface of the attracting magnet 34 and the outer peripheral surface of the cylindrical portion 38 of the rotor holder 14. Thereby, even when the accuracy of the cylindrical portion 38 formed by pressing is relatively low, the attracting magnet 34 can be disposed at an appropriate position.

  In the motor 13 of the present embodiment, the lid portion 20 has a fixing portion 25 fixed to the shaft 12, and the fixing portion 25 has a lowermost end A that contacts and is fixed to the shaft 12.

  In the motor 13 of the present embodiment, the lowermost end A of the fixing portion 25 of the lid portion 20 is positioned on the lower side in the axial direction of the first upper end surface 32a of the protruding portion 32. Thereby, the axial direction length of the site | part fixed to the shaft 12 of the cover part 20 is securable.

  The motor 13 of the present embodiment has a gap between the upper surface of the cover portion 14a and the lowermost end A of the fixing portion 25 of the lid portion 20. Thereby, when the lid portion 20 is fixed to the shaft 12 by an adhesive, the gap between the lower end of the portion fixed to the shaft 12 of the lid portion 20 and the upper surface of the cover portion 14a of the rotor holder 14 is utilized, When the lid portion 20 is fixed to the shaft 12, it is possible to hold an adhesive that is pushed downward in the axial direction of the lid portion 20.

  In the motor 13 of the present embodiment, the fixing portion 25 of the lid portion 20 has a radially outer side surface 25 a, and the first radially inner side surface 32 b of the projection portion 32 and the radially outer side surface 25 a of the fixing portion 25 of the lid portion 20. There is a gap between them. Thereby, the coaxiality between the lid 20 and the rotor holder 14 can be improved.

  The present invention is not limited to the above embodiment. Various modifications can be made without departing from the spirit of the present invention. For example, the various features of the above embodiments may be arbitrarily combined.

  The present invention can be used for an optical disk driving motor and an optical disk driving apparatus including the optical disk driving motor.

DESCRIPTION OF SYMBOLS 1 Disc drive device 4 Bush 11 Housing 13 Optical disk drive motor 14 Rotor holder 14a Cover part 14b Peripheral wall part 16 Turntable 20 Cover part 22 Disc mounting part 25 Fixing part 25a Radial outer side surface 32 Projection part 32a 1st upper end surface 32b 1st 1 radial inner surface 32c first radial outer surface 32d second upper end surface 32e second radial inner surface 32f second radial outer surface 34 suction magnet 34a radial outer surface 34b radial inner surface 36 flange 36a radially outer Side surface 38 Cylindrical portion 38a Outer peripheral surface A Bottom end X Center axis

Claims (17)

A shaft,
A sleeve into which the shaft is inserted and rotatably supports the shaft;
A bush formed by pressing with a magnetic material and containing the sleeve;
A substantially disc-shaped cover portion fixed to the axially upper portion of the shaft and extending in the radial direction, an annular projection extending axially upward from the upper surface of the cover portion, and downward from the radially outer portion of the cover portion A rotor holder having a peripheral wall portion extending toward the surface and formed by pressing with a magnetic material;
A turntable having a lid portion fixed to the shaft, a disk mounting portion that is positioned radially outside the lid portion and formed integrally with the lid portion, and located above the rotor holder; ,
A stator held on the outer peripheral surface of the bush;
A rotor magnet opposed to the stator via a gap in the radial direction and held on the inner peripheral surface of the peripheral wall portion;
An attraction magnet having a radially outer surface and a radially inner surface, disposed between the rotor holder and the bush, and partially overlapping with the protrusion in the axial direction;
With
The cover portion has an upper surface and a lower surface,
The lid portion has a cavity formed inside thereof,
The optical disk drive motor, wherein the protrusion is disposed in the cavity. In the optical disk drive motor according to claim 1,
The protrusion has an upper side and a lower side,
The upper surface of the protrusion has a first upper end surface, a first radially inner surface, and a first radially outer surface.
The lower surface of the protrusion has a second radially inner surface,
The first radially inner surface, the second radially inner surface, and the first radially outer surface are sequentially arranged from the inner side toward the outer side in the radial direction. In the optical disk drive motor according to claim 1 or 2,
The bush has a cylindrical main body,
The cylindrical main body has a flange extending radially outward from its axial upper end,
The flange has an upper surface and a radially outer surface. In the optical disk drive motor according to any one of claims 1 to 3,
The attraction magnet is disposed on the lower surface of the cover portion. In the optical disk drive motor according to claim 3,
The attraction magnet is disposed on the upper surface of the flange. In the optical disk drive motor according to any one of claims 2 to 5,
The first radially outer surface faces the disc mounting portion in the radial direction with a gap therebetween. The optical disk drive motor according to any one of claims 1 to 6,
The disk mounting portion is in contact with the upper surface of the cover portion. The optical disk drive motor according to any one of claims 3 to 7,
A radially outer surface of the flange is located radially outward from a radially outer surface of the attraction magnet. In the optical disk drive motor according to claim 2,
The bush has a cylindrical main body,
The cylindrical main body has a flange extending radially outward from its axial upper end,
The flange has an upper surface and a radially outer surface;
A radially outer side surface of the flange is located on a radially outer side than the second radially inner side surface of the protrusion. The optical disk drive motor according to any one of claims 1 to 9,
The cover portion has a radially inner side surface,
The rotor holder has a cylindrical portion extending from a radially inner side of the cover portion toward an axially lower side,
The cylindrical portion is fixed to the shaft. In the optical disk drive motor according to claim 10,
The cylindrical portion has an outer peripheral surface,
The attraction magnet is located radially outside the cylindrical portion of the rotor holder. The optical disk drive motor according to claim 11,
There is a gap between the radially inner surface of the suction magnet and the outer peripheral surface of the cylindrical portion of the rotor holder. In the optical disk drive motor according to claim 2,
The lid portion has a fixing portion fixed to the shaft,
The fixing portion has a lowermost end that contacts and is fixed to the shaft. In the optical disk drive motor according to claim 13,
The lowermost end of the fixed portion of the lid portion is positioned on the lower side in the axial direction than the first upper end surface. In the optical disk drive motor according to claim 13,
There is a gap between the upper surface of the cover part and the lowermost end. The optical disk drive motor according to claim 15,
The fixing portion of the lid portion has a radially outer surface,
A gap is provided between the first radially inner side surface and the radially outer side surface of the fixed portion.   An optical disk drive device comprising the optical disk drive motor according to claim 1.

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