KR20150051309A

KR20150051309A - Spindle Motor

Info

Publication number: KR20150051309A
Application number: KR1020140122169A
Authority: KR
Inventors: 이정훈; 송창섭
Original assignee: 주식회사 삼홍사
Priority date: 2013-11-01
Filing date: 2014-09-15
Publication date: 2015-05-12

Abstract

The present invention relates to a spindle motor which enables to precisely make a center of gravity of a turntable, a center of gravity of a rotor, and a center of axis of a rotary shaft same according to integration of the turntable, rotor, and rotary shaft so as to remove a factor generating vibration. The spindle motor of the present invention comprises: a rotary shaft; a turntable which has a central part secured to the rotary shaft to rotate with the rotary shaft, and includes a body having an surface of a disk mounted thereon and a sliding cone part that is elastically supported by the body and slides along the rotary shaft when an inner circumferential part is supported; and a rotor which is mounted inside a rotor mounting part integrally extended from the body of the turntable.

Description

[0001] SPINDLE MOTOR [0002]

The present invention relates to a spindle motor capable of precisely aligning a center of gravity of a turntable, a center of gravity of a rotor, and a shaft center of a rotary shaft by integrating a turntable, a rotor, and a rotary shaft, thereby eliminating a vibration generating factor.

In general, optical disc players such as LDP, CDP, CD-ROM and DVD-ROM player, DVD player, BD, 3D player and the like are used to load a disc on a turntable by a loading mechanism, clamp a mounting hole formed in the center of the disc, A unit clamped and fixed by a chuck, and the disc clamped on the chuck is rotated in one direction by a driving source of a spindle motor which is a driving unit, and moves in the radial direction thereof.

The spindle motor maintains a constant rotation characteristic by maintaining a constant contact area between the bearing and the rotary shaft to support the rotary shaft in a rotatable manner, thereby requiring a hard disk drive (HDD), an optical disk drive (ODD) And is widely adopted as a driving means for a recording medium.

Spindle motors requiring such high-speed rotation are required to be thinned and lightweight in order to respond to the development of electronic devices that are miniaturized day by day. Such spindle motors are disclosed in Korean Patent Laid-open Publication No. 10-2005-0066023, Korean Laid- 2008-0044933 and Korean Utility Model Publication No. 20-2010-0003934.

A conventional spindle motor disclosed in Korean Patent Publication No. 10-2005-0066023 includes a rotating shaft, a bearing for supporting the rotating shaft, a rotor fixed to the rotating shaft to rotate the rotating shaft, a turntable fixed to the upper end of the rotating shaft, And a ball cover which closes at least one side of the ball receiving portion which is opened and which is received in the ball receiving portion and which closes the ball receiving portion and at least one side surface to which the ball touches, . On the lower side of the turntable, a back yoke of the rotor having a central portion coupled to the rotating shaft is fixed.

In the conventional spindle motor disclosed in Korean Patent Laid-Open Publication No. 10-2008-0044933, a plate in which a coupling hole is formed, a bearing for rotatably supporting a rotary shaft is provided inside, and at least a part of the plate A thrust washer cover which is press-fitted to the bearing holder so as to contact the end of the rotating shaft and axially supports the thrust washer, a thrust washer cover which is press-fitted into the bearing holder to support the upper surface of the plate, And a rotor case having a circular plate portion fixed to the rotary shaft and an annular rim portion. The rotor case includes a disc portion fixed to the rotating shaft and an annular rim extending from the rim of the disc portion to face the armature and coupled to the inner surface of the first magnet and the back yoke, .

A conventional spindle motor disclosed in Korean Utility Model Publication No. 20-2010-0003934 has a bearing housing fixed to a base, a rotation shaft rotatably supported by a bearing press-fitted into a bearing housing, a stator fixed to an outer circumferential surface of the bearing housing, A rotor fixed to the rotating shaft and disposed with a constant gap from the stator, and a turntable disposed on the upper surface of the rotor and fixed to the rotating shaft to seat the disk. The stator includes a core fixed to the outer peripheral surface of the bearing housing and a coil wound around the core. The rotor includes a back yoke which is formed in a cylindrical shape with an open bottom and is fixed to a rotating shaft on the upper side of the bearing housing, and a magnet which is opposed to and joined to the stator on the inner circumferential surface of the back yoke.

In such a conventional spindle motor, when a current is applied to the coil of the stator, the rotation of the rotor is rotated by the interaction between the magnetic field formed by the coil and the magnetic field formed by the magnet. When the rotary shaft rotates in this way, the turntable fixed to the rotary shaft rotates together with the rotary shaft, and the disk placed on the turntable rotates together with the turntable.

The turntable used in the conventional spindle motor is disclosed in Korean Patent Laid-Open Publication No. 10-2005-0001016 and Korean Patent Laid-Open No. 10-2009-0048832.

The conventional turntable of the spindle motor disclosed in Korean Patent Laid-Open Publication No. 10-2005-0001016 has a body portion in which a disc coupling portion is formed on an upper portion of a shaft portion having a shaft coupling hole and a bracket portion in which a disc is seated, A magnet provided on the turntable body, and a cushioning member attached to a top edge of the bracket portion. In this case, the body portion and the bracket portion of the turntable body are integrally formed by injection molding. Also, when the turntable body is formed by injection molding, a magnet for holding the disk is inserted into the mold, and the turntable body portion and the magnet are integrally manufactured.

A turntable disclosed in Korean Patent Laid-Open Publication No. 10-2009-0048832 includes a cone portion on which a disk is detached, a base on which a disk is seated and a boss is formed, And yoke (yoke) for supporting the cone portion so as to be possible.

In the conventional spindle motor disclosed in the above patent publication, a rotor case (or a back yoke) to which a turntable and a magnet for a rotor are coupled is separately manufactured and coupled to a rotating shaft. That is, in the conventional spindle motor, after the turntable and the rotor case are manufactured separately, the rotor case is first assembled to the rotating shaft by the press-fitting method, and then the turntable is assembled to the rotating shaft by press- Adhesive is used between the turntable and the rotor case. Accordingly, the conventional spindle motor has a problem in that the manufacturing process is complicated and the manufacturing cost is increased.

Generally, the rotor case is made of an electric steel sheet or a metal material of an electromagnetic steel sheet called a silicon steel sheet, and is made of sheet metal. Therefore, when the rotary shaft is press-fitted into the central portion of the rotor case, the rotor case tends to be distorted by the pressure input of the rotary shaft.

As a result, when the rotary shaft is press-fitted into the rotor case and the turntable is engaged with the rotary shaft and fixed on the rotor case and then fixed by bonding, the turntable is also distorted as the rotor case is turned. In consideration of this, conventionally, a procedure for machining the disk mounting portion (rubber) smoothly after pressing the rotating shaft into the rotor case is required.

Further, the turntable and the rotor case (or back yoke) of the spindle motor disclosed in the above publications are sequentially coupled to the rotary shaft by a press-fitting method. Accordingly, as the rotary shaft, the turntable, and the rotor cases are coupled by the press-fitting method, the axial center of the rotary shaft, the center of gravity of the turntable, and the center of gravity of the rotor case are disagreated by the pressure input of the rotary shaft. As a result, when the rotary shaft is rotated in the state where the axis center of the rotary shaft, the center of gravity of the turntable, and the center of gravity of the rotor case are inconsistent, the rotary shaft is rotated while being vibrated, thereby causing the turntable to vibrate.

Particularly, since the weight of the rotor case is heavier than that of the turntable, it is required to have an ABS (Auto Balancing System) using ball balance in order to prevent vibration of the turntable when eccentrically connected to the center of the rotating shaft. The manufacturing cost is increased.

In addition, since the back yoke and the turntable are separately coupled to the rotary shaft of the conventional spindle motor disclosed in the above publications, it is difficult to precisely match the center of gravity of the turntable, the center of gravity of the rotor case, and the axis of the rotary shaft.

On the other hand, a drive device of an optical disc player is a structure for holding a disc when the disc is at 16 times speed, and a turntable in the form of a slide cone is applied. In the case of 24 times speed, a disc coupled to the slide cone does not come into contact with the rubber, As shown in FIG.

KR Patent Publication No. 10-2005-0066023 KR Patent Publication No. 10-2008-0044933 KR Public Utility Model Bulletin 20-2010-0003934 KR Patent Publication No. 10-2005-0001016 KR Patent Publication No. 10-2009-0048832

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its object is to integrate the turntable, the rotor, and the rotary shaft so that the center of gravity of the turntable, the center of gravity of the rotor, And to provide a spindle motor that can be removed.

Another object of the present invention is to provide a magnetic disk apparatus which has a sliding cone portion so that when the disk is loaded on the turntable, the center of gravity of the disk is guided along the axis of rotation such that the center of gravity of the disk coincides with the center of gravity of the turntable, The present invention provides a spindle motor having a sliding cone type turntable capable of minimizing the eccentricity and the occurrence of vibrations.

It is a further object of the present invention to provide a rotor mounting unit (or rotor case) integrally formed with a turntable to reduce the number of components, assembly process, and manufacturing cost, And a spindle motor.

It is another object of the present invention to provide a method of manufacturing a motorcycle by forming a rotor mounting portion (or a rotor case) integrally with a turntable, flattening a slip prevention ring (rubber) in consideration of occurrence of distortion of the rotor case when the rotary shaft is press- Which can eliminate the need for a spindle motor.

It is still another object of the present invention to provide a spindle motor in which a rotary shaft is integrally formed by an insert injection method when injection molding a turntable, thereby eliminating the need for a separate means for preventing the occurrence of wobbles in the turntable.

Another object of the present invention is to provide a bearing housing and a base plate which are integrated with each other by a method of injection molding a base plate by using a resin to form a bearing housing and the center of the rotary shaft coincides with the center axis of the bearing housing, So as to simplify the manufacturing cost of the spindle motor.

In order to achieve the above object, a spindle motor of the present invention includes a rotating shaft; And a sliding cone part which is fixed to the rotary shaft and rotates together with the rotary shaft and which is supported on one side of the disk and which is elastically supported on the body and slides along the rotary shaft when the inner peripheral part of the disk is supported, ; And a rotor mounted inside the rotor mounting portion integrally extended from the body of the turntable.

The turntable includes a body having a top surface formed with first to third grooves recessed towards the center and having a three-step structure, and a rotating shaft integrally coupled to the through hole formed at the center; A sliding concave portion that is slidably coupled to a rotary shaft protruding upward from the body and slidably moves in first to third grooves of the body when the inner peripheral portion of the disc is supported on the outer peripheral portion; An elastic member elastically supporting the sliding cone portion; And a plurality of coupling hooks installed at a boundary portion between the top surface flat portion of the body and the first groove, snap-engaged with the sliding cone portion, and preventing the sliding cone portion from being separated.

In this case, when the disk is loaded on the sliding cone, the outer circumferential portion of the sliding cone portion is seated on the first groove, one end of the elastic member is supported on the second groove, and the inner circumferential portion of the sliding cone portion is seated on the third groove .

Each of the plurality of coupling hooks is provided in a plurality of independent recesses formed at a boundary between the upper surface flat portion of the body and the first groove, and the tip end of the coupling hook is protruded by a first groove, A snap connection can be made with the outer peripheral portion of the portion. Further, a flange that is snap-engaged with the coupling hook may be formed on the lower outer peripheral portion of the sliding cone portion.

The sliding cone is cone-shaped to guide the insertion of the disc. The sliding cone has an inclined surface bent in two steps from the flat surface of the upper portion. When the disc is loaded, the inner peripheral portion of the disc is positioned on the lower side of the two- It is preferable to make contact with the inclined surface.

In addition, the sliding cone portion is formed with a hollow portion on the lower side in order to reduce the weight, and a cylindrical portion having a through hole through which a rotary shaft is slidably engaged is disposed at a central portion. A plurality of reinforcing ribs are spaced apart from each other on the inner side of the cylindrical portion and the bent inclined surface .

It is preferable that the spindle motor of the present invention further includes a slip prevention ring installed on the upper surface of the body so as to prevent slip phenomenon from occurring when the disk mounted on the turntable rotates.

Further, the spindle motor of the present invention may further include an autobalancing system provided in the turntable to prevent vibration of the rotating turntable. The autobalancing system may further include a balance member disposed on a bottom surface of the body of the turntable, Transfer passage; A balance member inserted into the balance member moving passage and displaced along the balance member moving path so that the center of gravity of the turntable and the entire center of gravity of the disk coincide with the axis of the rotating shaft when the turntable rotates; And a balance member moving path cover that closes the balance member moving path to prevent the balance member from being separated.

In this case, it is preferable that the balance member moving passage cover is integrally formed with the back yoke of the rotor.

In addition, the body includes a rotor mounting portion and first to third protrusions of three-tiered structure sequentially extending from an outer periphery of the body, a hook extending from an outer periphery of the second protrusion, The inner side is preferably snap-engaged with the hook.

Furthermore, it is preferable that the balance member moving passage is formed between the rotor mounting portion and the first projecting portion in the shape of a ring around the rotating shaft.

Wherein the turntable coupling prevention portion includes a turntable detachment prevention groove for preventing the turntable from falling in an axial direction of the rotary shaft, and the turntable detachment prevention groove is formed in the turntable detachment prevention groove to extend from the body of the turntable, It is preferable that the formed slip prevention protrusion be received.

The turntable coupling unit may include a turntable slip prevention groove for preventing the turntable from slipping from the rotation shaft.

Further, it is preferable that the rotating shaft is inserted and formed integrally when the body of the turntable is injection-molded.

Further, it is preferable that the rotor mounting portion and the turntable are integrally injection-molded.

A spindle motor of the present invention includes a bearing housing; The bearing housing may further include a bearing inserted and fixed to the bearing housing and rotatably supported by the rotation shaft. When the bearing housing is injection-molded using resin, the inner peripheral portion of the base plate is inserted and integrated.

According to another aspect of the present invention, a spindle motor includes a bearing housing; A bearing inserted and fixed in the bearing housing; A rotating shaft rotatably supported on the bearing housing; And a sliding cone part which is fixed to the rotary shaft and rotates together with the rotary shaft and which is supported on one side of the disk and which is elastically supported on the body and slides along the rotary shaft when the inner peripheral part of the disk is supported, ; A rotor mounted inside the rotor mounting portion integrally extended from the body of the turntable; An auto-balancing system provided in the turntable to prevent vibration of the rotating turntable; And a stator disposed at an inner surface of the rotor with a predetermined gap therebetween and fixed to an outer circumferential surface of the bearing housing.

In this case, the autobalancing system may include: a balance member for matching the center of gravity of the turntable with the entire center of gravity of the turntable and the disc when the turntable rotates; A balance member moving passage disposed on a lower surface of the turntable to receive the balance member with the rotation axis as a center; And a balance member moving path cover that closes the balance member moving path to prevent the balance member from being released, wherein the back yoke of the rotor is integrated with the balance member moving path cover.

As described above, according to the present invention, the center of gravity of the turntable, the center of gravity of the rotor, and the shaft center of the rotary shaft can be precisely aligned with each other by integrating the turntable, the rotor and the rotary shaft.

According to the present invention, when the disc is loaded on the turntable, the center of gravity of the disc is guided along the axis of rotation such that the center of gravity of the disc coincides with the center of gravity of the turntable, the center of gravity of the rotor, It is possible to minimize the eccentricity and the occurrence of vibration.

Further, in the present invention, the rotor mounting portion (or the rotor case) is integrally formed with the turntable to reduce the number of components, the assembling process, and the manufacturing cost, and eliminates the center of gravity inconsistency generated when the rotor mounting portion and the turntable are respectively coupled to the rotary shaft can do.

In addition, in the present invention, in consideration of the occurrence of warping of the rotor case when the rotor mounting portion is integrally formed with the turntable, when the rotary shaft is press-fitted into the rotor case, the slip prevention ring You can remove the procedure.

In addition, since the turntable and the rotor mounting portion are formed integrally with the spindle motor of the present invention, only the turntable needs to be mounted on the rotary shaft, thereby shortening the assembling process.

Further, in the present invention, a separate process of coupling the rotor case, i.e., the back yoke to the rotation shaft, which causes the center of gravity of the turntable, the center of gravity of the back yoke, The center of gravity and the axis center of the rotating shaft can be precisely matched to eliminate the vibration generating factor.

In addition, it is possible to secure the verticality of the bearing and the rotary shaft assembled by integrating the bearing housing and the base plate by the insert injection method while forming the bearing housing by using the resin, .

1 is a cross-sectional view of a spindle motor according to a first embodiment of the present invention.
FIGS. 2A to 2D are a perspective view, a plan view, a front view, and a cross-sectional view taken along line XY in FIG. 2C, respectively, of a turntable assembly incorporating a turntable, a rotary shaft, and a sliding cone portion according to a first embodiment of the present invention.
3 is a view for explaining the operation of the sliding cone portion according to the first embodiment of the present invention.
4 is a cross-sectional view of a spindle motor according to a second embodiment of the present invention.
5 is a cross-sectional view of a spindle motor according to a third embodiment of the present invention.
6 is a cross-sectional view of a spindle motor according to a fourth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. Definitions of these terms should be based on the content of this specification.

The spindle motor of the present invention can be applied not only to a spindle motor requiring high-speed rotation but also to a low-speed rotation motor, and is applicable to both a brushless DC motor and a DC motor.

FIG. 1 is a cross-sectional view of a spindle motor according to a first embodiment of the present invention. FIG. 2 is a perspective view of a turntable assembly incorporating a turntable, a rotary shaft, and a sliding cone assembly according to a first embodiment of the present invention, And FIG. 3 is a view for explaining the operation of the sliding cone portion according to the first embodiment of the present invention.

1 to 3, a spindle motor 1 according to a first embodiment of the present invention includes a base plate 10 for mounting a spindle motor to a disk player (not shown), a bearing A housing 20 rotatably supported by the bearing housing 20; a rotating shaft 30 enclosing the rotating shaft 30 and received in the bearing housing 20 to reduce friction between the rotating shaft 30 and the bearing housing 20; A turntable 50 mounted on the turntable 50 to rotate the turntable 50 and a rotor 60 mounted on the turntable 50. The turntable 50 includes a bearing 40, And a stator 70 disposed inside the bearing housing 20 and coupled to the bearing housing 20.

The spindle motor 1 according to the first embodiment of the present invention may be equipped with an autobalance system (ABS) for preventing the vibration of the turntable 20 as in the third and fourth embodiments shown in Figs. 5 and 6, (auto balancing system) 90.

The material of the base plate 10 may be a lightweight material such as aluminum and an aluminum alloy, or an iron-based alloy. However, the material of the base plate 10 is not limited to a lightweight material and an iron-based alloy, but may be another metal material or a synthetic resin.

The base plate 10 may be manufactured in various shapes according to products to which the spindle motor 1 is applied. Here, an example of a product to which the spindle motor 1 according to the embodiment of the present invention is applied may be a drive device of an optical disc player.

A printed circuit board (PCB) 15 or a FFC (FPC) board 15 on which a motor driving circuit (not shown) for driving the spindle motor 1 is formed is provided on one side of the base plate 10, (Flexible Flat Cable).

This motor drive circuit controls the frequency, phase, ON and OFF of the signal applied to the coil 75 of the stator 70 to rotate or stop the spindle motor 1, And the like. A method of bonding the printed circuit board 15 to the base plate 10 may be a rivet or an adhesive.

The bearing housing 20 may be formed in a cylindrical shape with one side opened and the other side closed to form a bearing receiving portion 21 and an oil holding portion 22 in which the bearing 40 is received. The bearing receiving portion 21 receives a bearing 40 in which a rotary shaft 30 is inserted. The oil reservoir portion 22 is located on the lower side of the bearing accommodating portion 21 and has an inner diameter smaller than the inner diameter of the bearing accommodating portion 21. [ Oil supplied to the bearing 40 and the rotary shaft 30 is stored in the oil storage portion 22.

A slit washer 24 may be seated on the bottom of the bearing receiving portion 21. The slit washer 24 restricts the axial movement of the rotary shaft 30 when the rotary shaft 30 is rotated to prevent the rotary shaft 30 from being disengaged from the bearing receiving portion 21. [

A thrust washer (23) is seated on the bottom of the oil reservoir (22). The thrust washer 23 disperses the force transmitted from the rotary shaft 30 and fixes the position of the rotary shaft 30. [ Further, when the rotary shaft 30 rotates, the frictional force acting on the rotary shaft 30 is reduced.

The bearing housing 20 is injection molded with thermosetting resin such as nylon 66 or engineering plastic such as polycarbonate (PC) or thermoplastic resin.

The bearing housing 20 may be integrally formed with the base plate 10 by an insert injection method when injection molding is performed using a thermoplastic or thermosetting resin. Accordingly, the center axis of the bearing housing 20 and the center of the rotation axis 30 are aligned with each other to improve the vertical degree, and the manufacturing process is simplified, thereby reducing the manufacturing cost. In addition, the base plate 10 may be provided with a bearing housing joint reinforcing portion 11 extending perpendicularly to the plane of the base plate 10. This bearing housing coupling reinforcing portion 11 further strengthens the coupling between the bearing housing 20 and the base plate 10.

In the spindle motor of the present invention, the coupling structure of the bearing housing and the base plate is such that the bearing housing 20-1 and the base plate 10 are separately manufactured and joined together as in the second embodiment shown in FIG. . That is, the bearing housing coupling hole 12 is formed in the base plate 10, so that the bearing housing 20-1 can be fitted into the bearing housing coupling hole 12 of the base plate 10. The method of fitting the bearing housing 20-1 into the bearing housing coupling hole 12 of the base plate 10 may be a press-fitting method or a bonding method using an adhesive.

The bearing 40 includes a rotating shaft through hole 41 that surrounds the outer circumferential surface of the rotating shaft 30. Such a bearing 40 reduces the frictional force acting on the rotary shaft 30 when the rotary shaft 30 is inserted into the rotary shaft through hole 41 and thereby smoothly rotates the rotary shaft 30, Is reduced.

The material of the bearing 40 may be an oil-containing sintered metal. That is, the bearing 40 may be a metal bearing in which oil permeates into a porous copper alloy (brass system). Here, the material of the bearing 40 is not limited to the oil-containing sintered metal but may be an oilless bearing as long as it reduces the frictional force acting on the rotary shaft 30. [

As described above, the bearing housing 20 is made of thermoplastic or thermosetting resin, and the bearing 40 is made of metal. Therefore, when the bearing 40 is press-fitted into the bearing housing 20, the strength of the bearing 40 made of a metal material is greater than the strength of the bearing housing 20 made of resin, A sizing process for securing the verticality of the bearing 40 and the rotary shaft 30 is not required.

An oil splash-proof washer 25, which rotatably passes through the rotary shaft 30, may be coupled to the upper side of the bearing 40. The oil scattering prevention washer 25 causes the oil that has risen along the outer surface of the rotary shaft 30 to descend along the outer surface of the bearing 40 and causes the oil that has risen along the outer surface of the rotary shaft 30 to flow out of the bearing accommodation portion 21 .

The rotary shaft 30 includes an anti-rotation shaft preventing portion 31 for preventing the rotary shaft 30 from separating from the bearing receiving portion 21 and a turntable engaging portion 32 to which the turntable 50 is coupled.

The rotation axis separation preventing portion 31 is formed by being recessed at a predetermined depth from the center of the rotation axis 30 around the cross section of the rotation axis 30. The inner diameter portion 24-1 of the slit washer 24 fixed to the bottom of the bearing accommodating portion 21 is located in the rotation shaft separation preventing portion 31. [ Therefore, when the rotary shaft 30 moves in the axial direction of the rotary shaft 30, the rotary shaft departure preventing portion 31 is caught by the inner diameter portion 24-1 of the sleeve washer 24, (21).

The turntable engaging portion 32 includes a turntable drop prevention groove 32-1 and a turntable non-slip prevention groove 32-2.

The turntable falling prevention groove 32-1 may be formed to be recessed at a predetermined depth from the center of the rotary shaft 30 around the transverse section of the rotary shaft 30. The slip prevention protrusion 56 extending from the body 51 of the turntable 50 is received in the turntable slip prevention groove 32-1. Therefore, when the turntable 50 is moved by the lifting force generated in the axial direction of the rotary shaft 30, the escape preventing protrusion 56 is caught by the turntable escape preventing groove 32-1, and the turntable 50 is caught by the rotating shaft 30 So that it is prevented from falling in the axial direction.

The turntable non-slip groove 32-2 may be formed by being recessed at a predetermined length and a predetermined depth in the axial direction of the rotary shaft 30 about the transverse section of the rotary shaft 30, or may be realized by knurling. Therefore, the turntable non-slip groove 32-2 prevents the body 51 of the turntable 50 from slipping in the rotating direction of the rotating shaft 30 to prevent the idle rotation or slip of the turntable 50 .

The stator 70 may be coupled to the upper portion of the bearing housing 20 such that the circumference of the stator 70 is spaced from the inner surface of the rotor 60. [ The stator 70 includes a ring-shaped body 71, a plurality of teeth 72 projecting radially from the outer periphery of the body 71, a plurality of bobbins 74 surrounding each of the plurality of teeth 72, And a coil 75 wound on a plurality of bobbins 74.

The coil 75 wound on the plurality of bobbins 74 is of three phases and can be Y-connected or delta-connected. Therefore, when AC power having a phase difference is applied to each of the coils 75 of the stator 70, the stator 70 forms a rotor system, and the rotor system thus formed is rotated with the magnets 62 of the rotor 60 And rotates the rotor 60.

2A to 2D, the turntable 50 includes a body 51, a sliding cone portion 54, an elastic member 57, a rotor mounting portion 55, and an anti-slip ring 58.

The body 51 has an inverted cylindrical structure whose height is smaller than the diameter of the body. The upper surface of the body 51 is depressed toward the center to form a groove 53 having a three-step structure. The lower surface of the body 51 has first to third projections 51-1 to 51-3, and the rotary shaft 30 is integrally coupled to the through hole 52 formed in the central portion.

The outer circumferential portion of the sliding cone portion 54 is seated on the first groove 53-1 and the outer circumferential portion of the sliding cone portion 54 is seated on the first groove 53-1. One end of the elastic member 57 is supported on the second groove 53-2 and the inner peripheral portion of the sliding cone 54 is seated on the third groove 53-3.

The sliding cone 54 is formed in a cone shape so as to be easily coupled to the hole of the disk D as a whole and the rotary shaft 30 is slidably coupled to the through hole 54-2 formed at the center, Guide insertion.

To this end, the sliding cone portion 54 has a two-step inclined surface 54-3 from the flat surface of the upper portion and guides the insertion of the disk D, and a flat flange 54-4 is formed at the lower outer circumferential portion . The inner peripheral portion of the disc D is brought into contact with the inclined surface located on the lower side of the two-step bent inclined surfaces 54-3.

The sliding cone portion 54 is made of a hollow portion on the lower side for weight saving and has a cylindrical portion 54-1 having a through hole 54-2 formed at its center portion and a large number of And reinforcing ribs 54-5 are formed at intervals.

In this case, a large number of small recesses 51-5, for example, six small quadrangular recesses 51-5 are formed at the boundary with the first recess 53-1 on the upper side of the body 51. The six recesses 51-5 Are respectively protruded from the outer circumferential portion of the sliding cone portion 54, that is, six coupling hooks 51-4 for snap-engagement with the flange 54-4.

When the sliding cone portion 54 is pushed into the body 51 when the sliding cone portion 54 is assembled to the body 51, the flange 54-4 of the sliding cone portion 54 is elastically deformed by the elastic deformation of the engaging hook 51-4, And the coupling hook 51-4 prevents the sliding cone portion 54 from coming off.

The elastic member 57 is formed of a compression spring and inserted between the lower hollow portion of the sliding cone portion 54 and the second groove 53-2 of the body 51 so that the hole located at the center of the disk D slides And provides an axial elastic force to the sliding cone portion 54 when inserted into the cone portion 54.

A slip prevention ring 58 is attached to an upper surface of the body 51 to prevent slippage of the disk D mounted on the turntable 50 from occurring during rotation.

The slip prevention ring 57 is made of a rubber material to increase the frictional force between the disk D and the body 51. Therefore, when the turntable 50 rotates while the disk D is seated on the body 51, the disk is prevented from sliding on the body 51. [

Between the body 51 of the turntable 50 and the rotary shaft 30, a coupling method or an insert injection method is used.

In the press-fitting / bonding method, the body 51 is manufactured by injection molding, and then the adhesive is injected into the through hole 52 of the body, and the rotary shaft 30 is inserted into the through hole 52 to be bonded. The insert injection method is a method of inserting the rotary shaft 30 when the body 51 of the turntable 50 is injection molded and coupling the rotary shaft 30 to the through hole 52.

When the rotary shaft 30 is inserted and coupled to the through hole 52 of the body 51 of the turntable 50 by the insert injection method as described above, the body of the turntable 50 is inserted into the turntable fall- The slip prevention protrusion 56 extending from the slider 51 is received to prevent the turntable 50 from being displaced in the axial direction of the rotary shaft 30, As the main portion is engaged, the turntable 50 is prevented from slipping in the rotating direction of the rotating shaft 30 when the rotor 60 rotates, thereby preventing the turntable 50 from idling or slipping.

The method of using the adhesive or coupling the rotary shaft 30 to the turntable 50 by the insert injection method is different from the conventional method of pressing the rotary shaft 30 into the through hole 52 to engage with the turntable 50, The center of gravity of the rotary shaft 30 and the center of the shaft of the rotary shaft 30 can be precisely aligned. As a result, in the conventional method of press-fitting the rotary shaft 30 into the through hole 52, the center of gravity of the turntable 50 and the shaft center of the rotary shaft 30 are frequently discordant due to pressure input , This problem has been solved in the present invention.

At the bottom edge of the body 51, a rotor mounting portion 55 extends in a cylindrical shape. The rotor mounting portion 55 has a cylindrical shape having an outer diameter smaller than the outer diameter of the body 51.

The back yoke 61 of the rotor 60 is press-fitted into the inner surface of the rotor mounting portion 55 formed in a cylindrical shape by an insert injection method, or is coupled by using an adhesive or by a hook fastening method using a hook.

The rotor 60 includes a back yoke 61 and a magnet 62. The rotor 60 includes a back yoke 61 and a magnet 62 disposed inside a rotor mounting portion 55 formed integrally with the body 51 of the turntable 50. [ (62) are sequentially installed.

The back yoke 61 may be formed of a non-oriented electromagnetic steel sheet suitable as a material of a small-sized electric motor. Here, the electromagnetic steel sheet is also called an electric steel sheet or a silicon steel sheet. The back yoke 61 is for providing a magnetic path through which the lines of magnetic force formed by the magnet 62 fixed to the inner surface of the back yoke 61 pass. Therefore, the material of the back yoke 61 may be any material having a small core loss and high permeability so as to form a magnetic path. The back yoke 61 can be formed into a cylindrical shape by rounding a strip-shaped steel plate or by superimposing a circular ring.

When the turntable 50 is injection-molded using resin, the rotor 51 having the above-described structure can be integrally formed with the body 51 of the turntable 50 and the rotor mounting portion 55.

As described above, in the present invention, the rotor mounting portion (or the rotor case) 55 is integrally formed with the body 51 of the turntable to reduce the number of parts, the assembling process, and the manufacturing cost, and the rotor case and the turntable 50 It is possible to eliminate the inconsistency of the center of gravity generated when the rotary shafts 30 are coupled with each other, thereby suppressing the occurrence of vibration.

In addition, according to the present invention, since the rotor mounting portion 55 is integrally formed with the body 51 of the turntable 50, the rotor case may be distorted when the rotary shaft is press- It is possible to eliminate the process of flattening the disk mounting portion (rubber) before assembling the turntable.

Since the spindle motor 1 of the present invention is formed integrally with the body 51 of the turntable 50 and the rotor mounting portion 55, only the turntable 50 can be mounted on the rotary shaft 30, There is an advantage.

Further, in the present invention, a separate process of joining the rotor case, that is, the back yoke to the rotation shaft, which causes the center of gravity of the turntable 50, the center of gravity of the back yoke 61 and the shaft center of the rotary shaft 30, The center of gravity of the turntable 50, the center of gravity of the back yoke 61, and the center of the shaft of the rotary shaft 30 can be precisely matched to eliminate the vibration generating factor.

Hereinafter, the operation of the sliding cone portion according to one embodiment of the present invention will be described with reference to FIG. 1 to FIG.

The sliding cone portion 54 according to the first embodiment of the present invention is configured such that when the disk D is not engaged, the sliding cone portion 54 ascends along the rotation axis 30 by the elastic force of the elastic member 57, The flange 54-4 of the sliding cone portion 54 is engaged with the plurality of coupling hooks 51-4 and remains at the raised position.

3, when the user inserts the disk D into the turntable 50, the inner peripheral portion of the disk D pushes the inclined surface 54-3 of the sliding cone portion 54, Down along the rotary shaft 30 while compressing the elastic member 57 until it is seated in the slip prevention ring 58.

The sliding cone portion 54 is moved down along the rotating shaft 30 so that the center of the disk D and the center of the turntable 50 and the axis of the rotating shaft 30 coincide with the disk D, D is guided toward the upper surface of the turntable 50 until it is seated in the slip prevention ring 58.

As a result, when the rotor 60 and the turntable 50 are rotated by the stator 70, the center of the disk D, the center of the turntable 50, and the axis of the rotating shaft 30 coincide with each other, The bearing housing 20 and the base plate 10 are integrally formed by the insert injection method so that the verticality of the bearing 40 and the rotary shaft 30 assembled to the bearing housing 20 and the base plate 10 can be secured, The vibration of the disk 30 and the turntable 50 can be suppressed, and the vibration of the disk D can be suppressed.

Therefore, the spindle motor of the present invention can be applied to a driving apparatus of an optical disc player without an ABS (Auto Balancing System) using ball balance to prevent vibration of the turntable.

In the present invention, vibration of the turntable 50 can be further suppressed by providing an ABS (Auto Balancing System) as shown in FIGS. 5 and 6. FIG.

Hereinafter, the spindle motor according to the third and fourth embodiments of the present invention will be described with reference to FIGS. 5 and 6. FIG.

In the third and fourth embodiments according to the present invention shown in Figs. 5 and 6, the same parts as those of the first and second embodiments are denoted by the same reference numerals, and a description thereof will be omitted.

The third and fourth embodiments are different from the first and second embodiments in that ABS is provided. In the spindle motor according to the third embodiment, as in the first embodiment, the bearing housing 20 is thermoplastic Or a thermosetting resin and is integrally formed with the base plate 10 by an insert injection method. In the spindle motor according to the fourth embodiment, the bearing housing 20-1 is made of a metal body And is press-fitted to the base plate 10 after being separately manufactured.

When the turntable 50 rotates in a state where the disc D is seated on the turntable 50, the ABS 90 that uses the ball balance to prevent the turntable from vibrating, And a balance member 92 which is recessed upward from the lower surface of the rim of the turntable 50 so that the balance member 92 moves along a circle centered on the rotary shaft 30 A balance member moving passage 91 for receiving the balance member 92 so as to be movable; And a balance member movement preventing passage for closing the balance member moving passage 91 when the back yoke 61 is coupled to the rotor mounting portion 55 so as to prevent the balance member 92 from being separated from the balance yoke 61. [ And includes a passage cover (94).

In addition, the balance member moving passage cover 94 may further include a fins 93 for allowing the balance member 92 to move smoothly. The juncture 93 may be formed of a woven fabric that is woven with plain yarn or twill using cotton yarn.

The body 51 of the turntable 50 is formed with a rotor mounting portion 55 and first to third protrusions 51-1 to 51-3 in three stages in order from the outside on the lower side. The balance member moving passage 91 forms a circular channel around the rotary shaft 10 between the rotor mounting portion 55 and the first projecting portion 51-1.

The balance member moving passage cover 94 closes the balance member moving passage 91 to prevent the balance member 92 from being separated from the balance member 92. In the third embodiment shown in Fig. 5, the balance member moving passage cover 94 is formed integrally with the back yoke 61 In the fourth embodiment shown in FIG. 6, the balance member moving passage cover 94 is provided so that the balance member moving passage cover 94 and the balance member moving passage cover 94 are simultaneously mounted when the back yoke 61 is engaged with the rotor mounting portion 55 And a back yoke 61, which are separated from each other.

In this case, a coupling hook 59 protrudes from the outer periphery of the second projection 51-2 in order to improve the assembling property of the balance member moving path cover 94.

The balance member moving path cover 94 integrally formed with the back yoke 61 according to the third embodiment is configured such that one end of the balance member moving path cover 94 is caught by the hook 59 during assembly and the back yoke 61 is press-fitted into the rotor mounting portion 55, so that the balance member moving path cover 94 is engaged with the turntable 50. As a result, the balance member moving path cover 94 and the back yoke 61 can be joined to the turntable 50 at one time, and the number of operations is reduced.

In the fourth embodiment, one end of the balance member moving passage cover 94 is caught by the hook 59 and is fixed to the contact surface with the first and second projecting portions 51-1 and 51-2 using an adhesive agent The other end of the balance member moving path cover 94 is fixed by fixing the back yoke 61 to the rotor mounting portion 55 by press fitting or using an adhesive.

The balance member moving passage cover 94 may be coupled to the ratchet 50 by a snap coupling using a hook, a press fitting or an adhesive, and the balance member moving passage cover 94 may be coupled to the ratchet Any method can be used as long as it is a method of binding.

In the fourth embodiment, a structure is shown in which one end is fixed using a hook 59 when the balance member moving passage cover 94 is assembled. However, it is also possible to fix it with an adhesive without using a hook.

The balance member 92 is formed of a heavy material that does not limit the shape and material of the balance member 92 to prevent eccentric vibration of the rotary shaft 30 by performing circular motion. The balance member 92 is preferably formed in a spherical shape so as to smoothly roll in the balance member moving passage 91.

In the spindle motor provided with the ABS (Auto Balancing System) according to the third and fourth embodiments, when the disk D is seated on the sliding cone portion 54 of the turntable 50 and rotated, The balance member 92 moves toward the eccentric opposite side of the entire weight of the turntable 50 and the disk D and the turntable 50 rotates counterclockwise The center of gravity of the rotary shaft 30 and the center of gravity of the disk 50 and the disk D coincide with each other. Therefore, it is possible to prevent vibration of the turntable 50, which may occur due to eccentricity.

The center of gravity of the turntable 50, the center of gravity of the rotor 60, and the center of the axis of the rotary shaft 30 can be defined as the center of the turntable 50, the rotor 60 and the rotary shaft 30, It is possible to precisely match them, and the vibration generating factor can be eliminated.

In the present invention, when the disk D is loaded on the turntable 50, the center of gravity of the disk D is positioned at the center of gravity of the turntable 50, the center of gravity of the rotor 60, And the rotation axis 30 so as to coincide with the center of the axis of the rotary shaft 30, it is possible to eliminate the occurrence of eccentricity between the disk and the turntable and hence the generation of vibration.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein. Various changes and modifications may be made by those skilled in the art.

1: Spindle motor 10: Base plate
20: bearing housing 21: bearing receiving portion
30: rotation axis 31: rotation axis separation prevention part
32: turntable engaging portion 40: bearing
50: Turn table 51: Body
52: through hole 53: groove
54: sliding cone part 55: rotor mounting part
58: slip prevention ring 57: elastic member
59: coupling hook 60: rotor
61: Back yoke 62: Magnet
70: stator 90: ABS
91: balance member moving passage 92: balance member
93: Jung 94: Balance member moving passage cover

Claims

A rotating shaft;
And a sliding cone part which is fixed to the rotary shaft and rotates together with the rotary shaft and which is supported on one side of the disk and which is elastically supported on the body and slides along the rotary shaft when the inner peripheral part of the disk is supported, ; And
And a rotor mounted inside the rotor mounting portion integrally extended from the body of the turntable.

The method according to claim 1,
The turn table
A body having an upper surface recessed towards the center and formed with first through third grooves of a three-stage structure, the rotating shaft being integrally coupled to the through hole formed at the center;
A sliding concave portion that is slidably coupled to a rotary shaft protruding upward from the body and slidably moves in first to third grooves of the body when the inner peripheral portion of the disc is supported on the outer peripheral portion;
An elastic member elastically supporting the sliding cone portion; And
And a plurality of coupling hooks provided at a boundary portion between the top surface flat portion of the body and the first groove and snap-engaged with the sliding cone portion to prevent separation of the sliding cone portion.

3. The method of claim 2,
Wherein an outer circumferential portion of the sliding cone portion is seated in a first groove when the disk is loaded in the sliding cone portion, one end of the elastic member is supported in the second groove, and an inner circumferential portion of the sliding cone portion is seated in the third groove.

3. The method of claim 2,
Each of the plurality of coupling hooks is provided in a plurality of independent grooves formed at a boundary portion between the top surface flat portion of the body and the first groove and the tip portion of the coupling hook is protruded by a first groove, And a spindle motor in which snap engagement is performed.

5. The method of claim 4,
And a flange for snap-engagement with the coupling hook is formed at a lower outer peripheral portion of the sliding cone portion.

The method according to claim 1,
The sliding cone is cone-shaped to guide the insertion of the disc. The sliding cone has an inclined surface bent in two steps from the flat surface of the upper portion. When the disc is loaded, the inner peripheral portion of the disc is positioned on the lower side of the two- A spindle motor in contact with an inclined surface.

The method according to claim 6,
The sliding cone portion is formed with a hollow portion on the lower side for weight saving and a cylindrical portion formed with a through hole through which a rotary shaft is slidably engaged is disposed at the center portion. A plurality of reinforcing ribs are formed on the inner side of the cylindrical portion and the bent inclined surface Spindle motor.

The method according to claim 1,
And a slip prevention ring provided on an upper surface of the body to prevent slip phenomenon from occurring when the disk mounted on the turntable rotates.

The method according to claim 1,
Further comprising an auto-balancing system provided in the turntable to prevent vibration of the rotating turntable,
The auto-
A balance member moving passage set on the bottom of the body of the turntable about the rotation axis;
A balance member inserted into the balance member moving passage and displaced along the balance member moving path so that the center of gravity of the turntable and the entire center of gravity of the disk coincide with the axis of the rotating shaft when the turntable rotates; And
And a balance member moving path cover that closes the balance member moving path to prevent the balance member from coming off.

10. The method of claim 9,
And the balance member moving passage cover is integrally formed with the back yoke of the rotor.

11. The method of claim 10,
The body includes a rotor mounting portion and first to third protrusions extending in three stages from an outer side to a lower side,
And a hook is extended to an outer peripheral portion of the second projection, and an inner side of the balance member moving path cover is snap-engaged with the hook.

12. The method of claim 11,
Wherein the balance member moving passage is formed in a ring shape around a rotating shaft between the rotor mounting portion and the first projecting portion.

The method according to claim 1,
Wherein the rotating shaft includes a turntable engaging portion to which the turntable is coupled,
Wherein the turntable coupling portion includes a turntable slip prevention groove for preventing the turntable from falling in the axial direction of the rotary shaft,
And a slip prevention protrusion extending from the body of the turntable is accommodated in the turntable slip prevention groove.

14. The method of claim 13,
Wherein the turntable coupling portion includes a turntable non-slip groove for preventing the turntable from slipping from the rotation shaft.

14. The method of claim 13,
Wherein the rotary shaft is inserted and formed integrally when the body of the turntable is injection molded.

The method according to claim 1,
Wherein the rotor mounting portion and the turntable are integrally injection-molded.

The method according to claim 1,
Bearing housing;
And a bearing which is inserted into the bearing housing and is rotatably supported by the rotation shaft,
And the inner peripheral portion of the base plate is inserted and integrated when the bearing housing is injection molded using resin.

Bearing housing;
A bearing inserted and fixed in the bearing housing;
A rotating shaft rotatably supported on the bearing housing;
And a sliding cone part which is fixed to the rotary shaft and rotates together with the rotary shaft and which is supported on one side of the disk and which is elastically supported on the body and slides along the rotary shaft when the inner peripheral part of the disk is supported, ;
A rotor mounted inside the rotor mounting portion integrally extended from the body of the turntable;
An auto-balancing system provided in the turntable to prevent vibration of the rotating turntable; And
And a stator disposed on the inner surface of the rotor at a predetermined gap and fixed to an outer circumferential surface of the bearing housing.

19. The method of claim 18,
The auto-
A balance member for matching the center of gravity of the turntable with the entire center of gravity of the turntable and the disc when the turntable rotates;
A balance member moving passage disposed on a lower surface of the turntable to receive the balance member with the rotation axis as a center; And
And a balance member moving path cover that closes the balance member moving path to prevent the balance member from coming off,
And the back yoke of the rotor is integrated with the balance member moving passage cover.