KR100996793B1 - Motor and disk driving apparatus - Google Patents

Abstract

It is an object of the present invention to provide a motor and a disk drive device that improve the fastening force between the shaft and the turntable while reducing the motor thickness and suppress the surface vibration of the disk due to the vibration of the turntable.

The outer circumferential surface of the upper portion of the shaft 21 is pressed into the inner circumferential surface of the bush 24. The outer circumferential surface of the bush 24 is fixed to the inner circumferential surface of the first cylindrical portion 2312 of the turntable 231 with an adhesive. The outer circumferential surface of the bush 24 and the inner circumferential surface of the first cylindrical portion 2312 are formed with a radial gap G in the axial direction. The adhesive is filled in this gap G.

Description

MOTOR AND DISK DRIVING APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening structure of a shaft and a turntable in a thin motor and a disk drive device, particularly a motor having a chucking device mounted on the thin disk drive device.

Conventionally, the demand for thinning is increasing in the disk drive apparatus which optically executes recording and reproducing. In accordance with the demand for thinning of the disk drive device, there is a demand for thinning of a motor having a chucking device for detachable disk and rotating the disk (refer to such a conventional thin motor). For example, see patent document 1).

(Patent Document 1) Japanese Unexamined Patent Publication No. 2005-253239

However, as the motor becomes thinner, each component constituting the motor is formed smaller in the rotation axis direction. Therefore, since the joining area of the fastening part of each component reduces, the fastening force of each component is reduced.

In particular, the fastening force between the shaft which becomes a rotating shaft and the turntable which has the inner peripheral surface fixed to the outer peripheral surface of a shaft is very small because the outer diameter of a shaft is small. Therefore, the external force applied to the motor or the force applied to the fastening portion between the shaft and the turntable when attaching or detaching the disk may weaken the fastening force between the shaft and the turntable and fail to maintain the required fastening force.

The turntable is provided with a mounting portion on which a disk is mounted. Therefore, the turntable needs to be mounted with high accuracy with respect to the shaft. In particular, the disk has recently been densified, and there is a possibility that an error occurs in recording and reproducing information on the disk due to surface vibration when the disk is rotated.

Accordingly, the present invention has been made in view of the above problem, and its object is to reduce the surface vibration of the disk due to the vibration of the turntable while improving the fastening force between the shaft and the turntable while reducing the motor thickness. It is to provide a motor and a disk drive device.

According to one aspect of the present invention, in a motor for rotating an annular disk having a central opening, a substantially cylindrical bush having a shaft serving as a rotating shaft, an inner circumferential surface fixed to an outer circumferential surface of the shaft, and fixed to an outer circumferential surface of the bush And a turntable having a cylindrical portion having an inner circumferential surface and a mounting portion formed radially outward from the cylindrical portion to mount the disk, wherein the outer circumferential surface of the bush and the inner circumferential surface of the cylindrical portion of the turntable form a gap in the radial direction. The gap is characterized in that the adhesive is filled.

According to the above-described aspect of the present invention, the joining area between the bush and the turntable can be increased by fixing the turntable to the outer circumferential surface of the bush having an outer diameter larger than that of the shaft. In addition, by fixing the bush and the turntable with an adhesive, it is possible to fix while adjusting the axial vibration caused by the rotation of the turntable in the mounting portion of the turntable. Therefore, since the vibration of the mounting portion can be reduced, it is possible to prevent generation of recording / reproducing error of the disk due to rotational vibration of the disk.

Preferably, the size of the inner diameter of the inner circumferential surface fixed to the outer circumferential surface of the shaft in the bush is characterized in that less than the size of the outer diameter of the outer circumferential surface of the shaft.

According to the above-described configuration, the inner diameter of the inner circumferential surface of the bush fixed to the shaft is equal to or less than the outer diameter of the outer circumferential surface of the shaft, and the bush is press-fitted to the shaft, so that the clamping force between the shaft and the bush is fixed to the shaft and the bush only with an adhesive. It is larger than the clamping force. Therefore, since the shaft and the bush can be firmly fixed, the bush can be prevented from coming off the shaft due to external vibration or external shock when the disk is mounted.

Preferably, the gap is provided between the outer circumferential surface of the bush and the inner circumferential surface of the cylindrical portion in the axial direction.

According to the above-described configuration, the disk mounting portion of the turntable is more precisely formed by the outer peripheral surface of the bush and the inner peripheral surface of the cylindrical portion of the turntable having a radial distance in the axial direction, that is, the cylindrical portion of the turntable does not contact the outer peripheral surface of the bush. Can be fixed while adjusting.

Preferably, the gap between the outer circumferential surface of the bush and the inner circumferential surface of the cylindrical portion has a first interval portion disposed along the axial direction and a second interval portion larger in size than the first interval portion. do.

According to the above-described configuration, by the first spacing portion, the central axis of the outer circumferential surface of the bush and the central axis of the inner circumferential surface of the cylindrical portion can be satisfactorily matched. Thus, the shaft and the turntable rotation axis can be well matched. As a result, rotational vibration in the radial direction and the circumferential direction can be reduced in the turntable.

Preferably, the inner circumferential surface of the cylindrical portion in the second spacing portion is formed with an annular concave diameter enlarged portion for expanding the inner diameter of the inner circumferential surface.

According to the above-described configuration, an adhesive filled in the diameter-expanded portion is formed by the diameter-expanded portion of the cylindrical portion, whereby a portion (second interval portion) having a large radial distance between the outer circumferential surface of the bush and the inner circumferential surface of the cylindrical portion is formed. The width in the radial direction can be increased. Therefore, the adhesive filled in the diameter-expanded portion can play a role of preventing the rotor holder (ie, the turntable) from falling out in the axial direction with respect to the bush.

Preferably, the turntable is formed of a press-formed magnetic body, and the diameter expansion portion is formed using a shock line generated during the press working.

According to the above-described configuration, by utilizing the shock line formed when pressing the cylindrical portion of the turntable as the diameter enlargement portion, the diameter enlargement portion can be easily formed, and the adhesive filled in the shock line (diameter enlargement portion) is applied to the bush. In this regard, the rotor holder can serve to prevent the axial direction from falling out.

Preferably, the first spacing portion is formed in the axial direction lower than the second spacing portion.

According to the above-described configuration, since the first spacing portion is formed below the second spacing portion in the axial direction, the center of the outer circumferential surface of the bush and the center of the cylindrical portion of the turntable can be easily and precisely matched in the first spacing portion. . Therefore, surface vibration of the mounting part of the turntable can be reduced.

Preferably, an annular projection having an annular projection having an enlarged outer diameter of the outer circumferential surface is formed on an outer circumferential surface of the bush, and the first gap is formed on an outer circumference of the annular projection.

According to the above-described configuration, the annular projection is formed on the outer circumferential surface of the bush, so that the second gap is formed between the annular projection and the cylindrical portion facing the radial direction. By this annular projection, the central axis of the bush and the central axis of the cylindrical part of the turntable can be satisfactorily matched, so that rotational vibration in the radial direction and the circumferential direction of the turntable can be reduced.

Preferably, the size in the axial direction of the outer circumferential surface of the bush is less than or equal to the size in the axial direction of the inner circumferential surface of the cylindrical portion of the turntable.

According to the above-described configuration, the size of the outer circumferential surface of the bush is equal to or less than the size of the inner circumferential surface of the cylindrical portion of the turntable, so that the adhesive can be kept inside without leaking to the outside of the cylindrical portion of the turntable. Therefore, the adhesive can be prevented from adhering to other parts of the motor, thereby providing a highly reliable motor.

Preferably, an enlarged portion is formed in the upper portion of the inner circumferential surface of the cylindrical portion, the diameter of which extends upward in the axial direction, and the adhesive is filled to the enlarged portion.

According to the above-described configuration, when the adhesive is filled to the enlarged portion, in the case of deformation due to heat, the force applied to the bonding surface between the adhesive and the cylindrical portion of the turntable has a tensile force as compared with the case where the enlarged portion is not formed. It decreases and a shearing force improves. Since the adhesive has a greater yield strength in relation to the shear force than the tensile force, the fastening strength between the bush and the turntable can be improved.

Preferably, the inner circumferential surface of the cylindrical portion is formed with an annular concave diameter expanding portion for expanding the inner diameter of the inner circumferential surface, and an annular projection having a toroidal protrusion shape for expanding the outer diameter of the outer circumferential surface is formed on the outer circumferential surface of the bush, The annular projection is characterized in that it is formed in the axial direction lower than the diameter expansion portion.

According to the above-described configuration, the annular projection is formed below the diameter-expanded portion in the axial direction, whereby the cylindrical portion of the turntable and the bush can be easily inserted. In other words, it is possible to prevent a part of the annular projection from entering the diameter expanding portion. Therefore, manufacture of a motor can be performed easily, and productivity of a motor can be improved.

Preferably, the lower surface of the bush has a first lower surface and a second lower surface formed at different positions in the axial direction, and the second lower surface is formed above the first lower surface in the axial direction and furthermore, the first lower surface. It is characterized in that formed on the outer side in the radial direction than the lower surface.

According to the above-described configuration, the second lower surface formed axially above the first lower surface of the bush is formed radially outward than the first lower surface, so that the adhesive agent for engaging the outer circumferential surface of the bush and the inner circumferential surface of the turntable is first lower surface. You can prevent invading the side. Moreover, an adhesive agent can be integrated between a 2nd lower surface and the lower end of a cylindrical part, and the joining strength of the bush and the cylindrical part of a turntable can further be improved.

Preferably, a third lower surface formed on the axial direction upper side than the second lower surface is formed between the first lower surface and the second lower surface in the radial direction.

According to the above configuration, by forming the third lower surface, it is possible to further prevent the adhesive from invading the first lower surface.

Preferably, a bearing mechanism for rotatably supporting the shaft is disposed below the bush in an axial direction, and the turntable is provided with a flat portion formed radially outward from the cylindrical portion, and the lower surface of the bush is It is characterized in that formed on the upper side in the axial direction than the flat portion.

According to the above configuration, the lower surface of the bush can be formed above the axial direction, as compared with the case where the cylindrical portion of the shaft and the turntable is directly fixed. Therefore, the bearing mechanism can be supported longer in the axial direction with respect to the shaft. As a result, the rotational vibration of the shaft can be reduced.

Preferably, a substantially cylindrical sleeve made of a containing sintered material having an inner circumferential surface rotatably supporting the shaft is disposed below the bush in an axial direction, and radially outward of the sleeve, A housing having a holding cylinder having an inner circumferential surface for holding an outer circumferential surface of the sleeve is disposed, the sleeve having an annular first inclined surface connecting the upper surface and the outer circumferential surface of the sleeve and an annular connecting the upper surface and the inner circumferential surface of the sleeve. A second inclined surface, an annular third inclined surface connecting the lower surface and the inner circumferential surface of the sleeve, and an annular fourth inclined surface connecting the lower surface and the outer circumferential surface of the sleeve are provided, and the radial and axial directions of the first inclined surface are provided. The width is larger than the width in each of the radial and axial directions of the second inclined surface, the third inclined surface and the fourth inclined surface. And forming, inside circumferential surface of the holding cylindrical portion is characterized in that the upper side is formed to the axial direction of the outer peripheral surface of the sleeve.

According to the above-described configuration, since the inner circumferential surface of the holding cylinder portion is formed to the upper side in the axial direction than the outer circumferential surface of the sleeve, the oil soaked in the upper surface of the sleeve can be held between the first inclined surface and the inner circumferential surface of the holding cylinder portion. Therefore, since the oil soaked in the upper surface of the sleeve is absorbed in the sleeve again, the reduction of the sleeve oil can be suppressed. As a result, the bearing life of the sleeve can be extended. In addition, since the first inclined surface is formed to be the largest in comparison with the second inclined surface, the third inclined surface and the fourth inclined surface, the structure that suppresses the reduction of sleeve oil can be adopted while extending the inner peripheral surface supporting the shaft in the axial direction. have. Therefore, it is possible to satisfy both the reduction of the rotational vibration of the shaft and the extension of the bearing life of the sleeve in the space in the axial direction of the limited motor.

Preferably, a substantially cylindrical sleeve made of a sintered material having an inner circumferential surface rotatably supporting the shaft is disposed below the bush in an axial direction, and an outer circumferential surface of the sleeve is disposed on a radially outer side of the sleeve. A housing having a holding cylindrical portion having an inner circumferential surface for holding is disposed, and the sleeve is provided with an annular first inclined surface connecting the upper surface and the outer circumferential surface of the sleeve, and an inner circumference of the first inclined surface is the second lower surface. It is characterized in that it is formed in the radially inner side than the inner position of the inner circumference and the radial direction or the inner circumference of the second lower surface.

According to the above-described configuration, the inner circumference of the first inclined surface is formed at the same position as the inner circumference of the second lower surface in the radial direction, or more radially inward, so that the first inclined surface is applied to the second lower surface. The distance can be secured in the axial direction with respect to. Therefore, it is possible to prevent the adhesive from adhering to the sleeve. As a result, a highly reliable motor can be provided.

Preferably, a substantially cylindrical sleeve made of a sintered material having an inner circumferential surface rotatably supporting the shaft is disposed below the bush in an axial direction, and an outer circumferential surface of the sleeve is disposed on a radially outer side of the sleeve. A housing having a holding cylindrical portion having an inner circumferential surface for holding is disposed, and the sleeve is provided with an annular first inclined surface connecting the upper surface and the outer circumferential surface of the sleeve, and an inner circumference of the first inclined surface is the third lower surface. The inner circumference and the inner circumference of the same position in the radial direction, or characterized in that formed in the radially inner side than the inner circumference of the third lower surface.

According to the above-described configuration, the inner circumference of the first inclined surface is formed at the same position as the inner circumference of the third lower surface in the radial direction, or more radially inward, so that the first inclined surface is applied to the adhesive applied to the third lower surface. The distance in the axial direction can be secured. Therefore, it is possible to prevent the adhesive from adhering to the sleeve. As a result, a highly reliable motor can be provided.

Preferably, the turntable is provided with a second cylindrical portion formed radially outward from the cylindrical portion and further below the axial direction, and a connecting portion connecting the cylindrical portion and the second cylindrical portion, wherein the flat portion includes: The housing which is formed in the axial direction lower side than the said connection part, and is connected with the said 2nd cylindrical part, and has the inner cylinder surface which has an inner peripheral surface holding the said bearing mechanism is provided in the radially outer side of the said bearing mechanism, The upper end portion of the holding cylinder portion is formed to be axially above the lower surface of the planar portion and axially lower than the lower surface of the connecting portion, and the inner circumferential surface of the second cylindrical portion faces the outer circumferential surface of the holding cylinder portion in a radial direction. It is characterized by.

According to the above configuration, the bearing mechanism can be extended in the axial direction in the space in the axial direction of the limited motor by forming the second cylindrical portion that faces the outer circumferential surface of the holding cylinder portion in the radial direction. In addition, since the bent portion of the turntable increases by forming the second cylindrical portion and the connecting portion, the strength of the turntable can be improved. Therefore, even in a thin board turntable, the motor which reduced the vibration of the turntable itself can be provided.

Preferably, an outer circumferential surface of the cylindrical portion of the turntable is equipped with a chucking mechanism for adjusting the center of the disk to coincide with the rotation axis.

Preferably, the chucking mechanism includes a substantially disk-shaped case having an inner circumferential surface fixed to an outer circumferential surface of the cylindrical portion, a chucking claw portion contacting the central opening provided in the disk and holding the disk, and accommodated in the case. And an elastic member for urging the chucking toenail portion radially outward.

According to another aspect of the present invention, in the disk drive apparatus equipped with the motor described above, an optical pickup mechanism for receiving light reflected from the disk or emitting light to the disk, and the optical pickup mechanism in a radial direction. And a moving mechanism for moving.

According to the above configuration, it is possible to provide a highly reliable disk drive apparatus with reduced surface vibration of the disk.

According to still another aspect of the present invention, there is provided a manufacturing method for manufacturing a motor, comprising the steps of: pressing the bush into an outer circumferential surface of the shaft, adhering an outer circumferential surface of the bush and an inner circumferential surface of the cylindrical portion of the turntable; And adjusting the turntable and the bush so that the upper surface of the disk mounting portion is substantially perpendicular to the direction in which the shaft extends.

According to the above configuration, the turntable can be mounted with high accuracy on the shaft without being affected by the bush. Therefore, the surface vibration of the disk mounting portion of the turntable can be reduced.

Preferably, the above-described method comprises a first jig having a concave shaft holding portion in the axial direction for holding the shaft, a plane in contact with an upper surface of the disk mounting portion of the turntable, and perpendicular to the axial direction. It has a turntable holding part provided with the contact plane part which has a 2nd jig which hold | maintains the said turntable. Further, the first jig is provided with a first flat part that is a plane perpendicular to the axial direction of the shaft holding part, and the second jig has a surface formed in parallel with the first flat part and the first flat part. A second planar portion for contacting is provided, and the first planar portion and the second planar portion are in contact with each other when the cylindrical portion is mounted to the bush.

According to the above-described configuration, the shaft and the turntable can be easily mounted with high accuracy by the first jig and the second jig.

Preferably, the bonding step includes a first bonding step of applying an adhesive to at least one of an outer circumferential surface of the bush or an inner circumferential surface of the cylindrical portion of the turntable, and fixing the bush and the turntable, and the first bonding step. And a second bonding step of further filling an adhesive between the bush and the turntable.

According to the above configuration, the clamping force between the bush and the turntable can be further improved by performing the second bonding step after the first bonding step. Therefore, a highly reliable motor can be provided.

Preferably, the adhesive is an ultraviolet curable adhesive.

According to the above-described configuration, by using an ultraviolet curable adhesive, the adhesive can be cured quickly and easily in a state where the shaft and the turntable are mounted with high accuracy. Therefore, the influence by hardening of an adhesive agent can be reduced. As a result, the shaft and the turntable can be mounted with high accuracy.

According to the present invention, it is possible to provide a motor and a disk drive device which improve the fastening force between the shaft and the turntable while reducing the motor thickness and suppress the surface vibration of the disk due to the vibration of the turntable.

(Whole structure of the motor)

In one embodiment of the motor of the present invention, the entire structure will be described with reference to FIG. 1. 1: is a schematic cross section which cut | disconnected the motor of this invention in the axial direction.

Referring to FIG. 1, the motor 1 includes a shaft 21 disposed on the same axis as a predetermined central axis J1, and a rotor magnet 22 and a disk (not shown) which integrally rotate with the shaft 21. The rotating body 2 having the chucking device 23 which can be attached or detached, the bearing mechanism 3 for rotatably supporting the shaft 21, and the housing 41 holding the bearing mechanism 3. The branch consists of the stationary body 4. In the following description, for convenience, the chucking device 23 side is described as the upper side and the housing 41 side as the lower side along the central axis J1, but the central axis J1 does not necessarily coincide with the gravity direction.

The rotating body 2 includes a shaft 21, a substantially annular bush 24 fixed to an upper portion of the shaft 21, a turntable 231 fixed to an outer circumferential surface of the bush 24, and a turntable 231. Rotor magnet 22 is fixed to the chuck), and the chuck case 232 which is a chucking mechanism fixed to the center of the turntable (231). Here, the chucking device 23 is configured from the turntable 231 and the chuck case 232.

The bearing mechanism 3 includes an approximately cylindrical sleeve 31 for rotatably supporting the shaft 21 in the radial direction, and a substantially disc-shaped thrust plate 32 for rotatably supporting the shaft 21 in the axial direction. It consists of The sleeve 31 includes a through hole penetrating in the axial direction, in which the shaft 21 is inserted, and is made of a sintered material. The thrust plate 32 is disposed below the sleeve 31.

The stationary body 4 includes a housing 41 having a holding cylindrical portion 411 having an inner circumferential surface holding the outer circumferential surface of the sleeve 31, a stator 42 fixed to the housing 41, and a housing 41. Of the thrust plate 32 of the attachment plate 43 fixed to the lower surface of the outer circumferential side, the circuit board 44 fixed to the upper surface of the attachment plate 43, and the inner circumferential side of the housing 41. It consists of a plate 45 having an upper surface in contact with the lower surface. In addition, the suction magnet 46 is fixed to the inside of the housing 41 in the radial direction from the stator 42.

 (Whole structure of chucking device)

Next, the whole structure in one Embodiment of the Example of the chucking apparatus 23 of this invention is demonstrated using FIGS. 2 is a plan view of the chucking device 23 of the present invention seen from above. 3 is a plan view of the turntable 231 of the present invention seen from above. 4A and 4B show the turntable 231 of the present invention, FIG. 4A is a schematic sectional view cut along the axial direction, and FIG. 4B is an enlarged view of the dotted circle in FIG. 4A.

1 and 2, the chucking device 23 includes a turntable 231 having a disk mounting portion 2311 for mounting a disk, and a chuck case 232 disposed radially inward from the disk mounting portion 2311. It consists of.

The chuck case 232 includes a substantially disc shaped case 2321 in which a resin material is formed by injection molding, an elastic member 2322 (in this embodiment, for example, a coil spring) accommodated in the case 2321, It consists of the chucking claw part 2323 urged radially outward by the elastic member 2232. In the present embodiment, the elastic members 2322 and the chucking claws 2323 are each three, for example. Further, the outer circumferential surface of the case 2321 is in contact with the center opening of the disc (not shown), whereby the center ring 2321a adjusts the center of the case 2321 and the center of the center opening of the disc to coincide. Is formed integrally with a gap therebetween in the circumferential direction. In this embodiment, three guard rings 2321a are formed, for example.

Referring to FIG. 1, the case 2321 includes a top plate portion 2321b and a top plate portion 2321b which cover the upper side of the outer cylindrical portion 2321a and the cylindrical portion 2321a facing in the radial direction with the inner circumferential surface of the central opening of the disc. The base part 2321c which extends axially downward from the center part and has a through hole in the center is provided. On the outer surface of the base portion 2321c, a flat portion 2321c1 in contact with the radially inner end of the elastic member 2232 is formed. The planar portion 2321c1 is a plane extending in a direction perpendicular to the radial direction. And the projection part 2321c2 extended radially outwardly fitted with the elastic member 2322 is integrally formed in the center part of the flat part 2321c1.

3 and 4A and 4B, the turntable 231 is formed in a substantially cylindrical shape by a steel sheet of magnetic material of a thin board that is pressed. In the present embodiment, in particular, the turntable 231 is formed during press work, for example, by drawing work. In this embodiment, the turntable 231 is formed of, for example, a galvanized steel sheet. The turntable 231 has a first cylindrical portion 2312 having an inner circumferential surface attached to the outer circumferential surface of the bush 24 and a first planar portion extending radially outward from the lower end of the first cylindrical portion 2312. 2313, a second cylindrical portion 2314 extending axially downward from the outer periphery of the first planar portion 2313, and a second flat surface extending radially outward from a lower end of the second cylindrical portion 2314. A portion 2315 and a third cylindrical portion 2316 extending downward in the axial direction from the outer periphery of the second planar portion 2315. Here, the annular recessed part 2317 is comprised from the 1st planar part 2313 and the 2nd cylindrical part 2314 (refer FIG. 8). Moreover, the disk mounting part 2311 which mounts a disk is provided in the outer peripheral side of the 2nd flat part 2315. And the rotor magnet 22 is fixed to the inner peripheral surface of the 3rd cylindrical part 2316 (refer FIG. 1). In addition, like the first cylindrical portion 2312, the first flat portion 2313, the second cylindrical portion 2314, and the second flat portion 2315, three bent portions are provided at the central portion of the turntable 231. Since the shape is to be made, the rigidity of the turntable 231 itself can be improved. In particular, in this embodiment, in order to sandwich the bush 24, the length of the 1st planar part 2313 in the radial direction is formed short. Accordingly, the rigidity of the turntable 231 can be further improved. Therefore, when the motor 1 rotates, the shake of the turntable 231 itself can be reduced.

On the inner circumferential surface of the first cylindrical portion 2312, a diameter expanding portion 2312a is formed in which the inner diameter of the inner circumferential surface is enlarged. This diameter expansion part 2312a is formed by recessing the inner circumferential surface in an annular concave shape outward in the radial direction. And especially in press work, the diameter expansion part 2312a is corresponded to a shock line. In addition, an enlarged portion 2312b is formed in the upper end of the inner circumferential surface of the first cylindrical portion 2312, the diameter of which extends upward in the axial direction. This enlarged portion 2312b is connected to the upper surface of the first cylindrical portion 2312.

(Fastening structure of shaft, bush, turntable)

Next, the fastening structure between the shaft 21, the bush 24, and the turntable 231 of the present invention will be described with reference to Figs. FIG. 5: is a schematic cross section cut in the axial direction which shows the fastening structure between the shaft 21, the bush 24, and the turntable 231. FIG. 6 is an enlarged view of the dotted line circle of FIG. 7A and 7B show the bush 24, FIG. 7A is a schematic cross-sectional view of the bush 24 cut in the axial direction, and FIG. 7B is a plan view of the bush 24 viewed from below. 5 and 6, the cross hatched portion represents the adhesive.

7A and 7B, the bush 24 is formed into a substantially cylindrical shape by cutting a metal material having good machinability. In the present embodiment, the bush 24 is formed of, for example, brass. The bush 24 is provided with a through hole 241 along the axial direction that is fitted with the shaft 21. In the lower part of the outer peripheral surface of the bush 24, the annular projection part 242 which protrudes radially outward compared with the upper part of the outer peripheral surface is formed.

The lower surface of the bush 24 has a first lower surface 243, which is an inner circumferential side of the lower surface of the bush 24, and a second lower surface 244, which is a lower surface of an outer circumferential side than the first lower surface 243. And the 2nd lower surface 244 is formed so that it may become axially upper side compared with the 1st lower surface 243. As shown in FIG. Moreover, between the 1st lower surface 243 and the 2nd lower surface 244 in the radial direction, the 3rd lower surface 245 which becomes axially upper side rather than the 2nd lower surface 244 is formed. The first lower surface 243, the second lower surface 244, and the third lower surface 245 are connected to the inclined surface, respectively.

The bush 24 has a first chamfer portion 246 whose diameter decreases toward the upper side in the axial direction connecting the upper surface and the outer circumferential surface, and a second chamfer whose diameter increases toward the upper side in the axial direction connecting the lower surface and the outer peripheral surface. A base 247. In addition, the chamfer may be formed in the inner peripheral surface side of the bush 24 similarly.

Referring to FIG. 5, the outer circumferential surface of the upper portion of the shaft 21 is press-fitted into the inner circumferential surface of the through hole 241 of the bush 24. The outer circumferential surface of the bush 24 is fixed to the inner circumferential surface of the first cylindrical portion 2312 of the turntable 231 by an adhesive. Moreover, the outer diameter of the outer peripheral surface of the bush 24 is formed so that it may become larger than the outer diameter of the outer peripheral surface of the shaft 21. Accordingly, the fastening force between the turntable 231 and the bush 24 can be improved.

Referring to FIG. 6, an interval G in the axial direction is formed between the outer circumferential surface of the bush 24 and the inner circumferential surface of the first cylindrical portion 2312 of the turntable 231. The adhesive is filled in this gap G. The space | interval G is the 1st space | interval G1 formed between the outer peripheral surface of the annular projection part 242 of the bush 24, and the inner peripheral surface of the 1st cylindrical part 2312 of the turntable 231 opposing radially. ) And a second gap portion G2 having a larger gap in the radial direction than the first gap portion G1, which is formed above the annular projection 242 in the axial direction. By forming the 2nd space | interval part G2 axially upper side than the 1st space | interval part G1, the coaxiality of the bush 24 and the turntable 231 can be adjusted with high precision. In particular, since the bush 24 is fixed from the lower side of the turntable 231, it is first inserted into the first gap portion G1. Therefore, by adjusting the coaxiality between the bush 24 and the turntable 231 with high precision by the 1st space | interval part G1, the 2nd space | interval part G2 which has larger space | interval than 1st space | interval part G1. The accuracy of the coaxiality between the bush 24 and the turntable 231 can be prevented from decreasing.

The second gap portion G2 is an outer circumferential surface of the bush 24 and an inner circumferential surface of the first cylindrical portion 2312 that faces the outer circumferential surface in the radial direction (in particular, the diameter-expanded portion 2312a and the inner circumferential surface thereof). It is formed between in the radial direction. By this structure, the shock line corresponding to the diameter expansion part 2312a of the turntable 231 is provided in the 2nd space | interval part G2 side. Thereby, formation of a shock line can prevent the coaxiality of the bush 24 and the 1st cylindrical part 2312 of the turntable 231 from falling. Moreover, by the diameter expanding part 2312a, the space | interval of the center part of an axial direction in the space | interval G becomes a shape wider than the space | interval below an axial direction upper side and an axial direction lower than a center part. Thus, by setting it as the structure which has the 1st space | interval part G1 and the 2nd space | interval part G2, the adhesive force filled in the outer peripheral surface of the bush 24 and the inner peripheral surface of the 1st cylindrical part 2312 is the peeling strength of an adhesive interface. It can be set as the adhesive structure which combines the shear strength of the adhesive force and the adhesive agent itself. Therefore, the fastening force between the bush 24 and the turntable 231 can be stabilized. Moreover, the adhesive filled between the diameter expansion part 2312a and the outer peripheral surface of the bush 24 can play a role of preventing the fall of the turntable 231 with respect to the bush 24 in the axial direction. Therefore, the fastening force between the bush 24 and the turntable 231 can be improved.

Moreover, the magnitude | size of the axial direction of the outer peripheral surface of the bush 24 is formed so that it may become below the magnitude | size of the axial direction of the inner peripheral surface of the 1st cylindrical part 2312 of the turntable 231. As shown in FIG. This structure can prevent the adhesive filled between the outer circumferential surface of the bush 24 and the inner circumferential surface of the first cylindrical portion 2312 from leaking outward from the first cylindrical portion 2312 in the radial direction. Therefore, since the adhesive agent can be prevented from adhering to portions other than the bush 24 and the first cylindrical portion 2312, a highly reliable motor can be provided.

The enlarged part 2312b of the 1st cylindrical part 2312 is provided so that it may be equivalent to the upper surface of the bush 24 in an axial direction, or to be axially upper side rather than the upper surface of the bush 24. As shown in FIG. Moreover, the adhesive agent is filled to at least one part of the expanded part 2312b. By this structure, in the case of deformation | transformation by heat, the force exerted on the joining surface of an adhesive agent and the 1st cylindrical part 2312 reduces tension | tensile force and improves a shearing force compared with the case where the expanded part 2312b is not formed. do. Since the adhesive has a larger yield strength with respect to the shear force than the yield strength with respect to the tensile force, the fastening force between the bush 24 and the turntable 231 can be improved. Therefore, a highly reliable motor can be provided even in a high temperature environment and a low temperature environment.

In addition, a bent portion 2312c is formed between the first cylindrical portion 2312 and the first planar portion 2313 to bend from the first cylindrical portion 2312 in a direction in which the diameter is enlarged. And the adhesive agent is filled to at least one part of the curved part 2312c. With this structure, in the case of deformation due to heat, the force applied to the bonding surface between the adhesive and the first cylindrical portion 2312 reduces the tensile force and improves the shearing force as compared with the case where the bent portion 2312c is not formed. Therefore, the fastening force between the bush 24 and the turntable 231 can be further improved. Therefore, a highly reliable motor can be provided even in a high temperature environment and a low temperature environment.

Moreover, the adhesive agent is filled to the outer peripheral side of the upper surface of the bush 24, and to the 3rd lower surface 245 of the bush 24. As shown in FIG. By forming the second lower surface 244 and the third lower surface 245 in the bush 24, it can play a role as an integrated portion of the adhesive. Therefore, it is possible to prevent the adhesive from adhering to the first lower surface 242 and the shaft 21. As a result, since the adhesive agent can be prevented from adhering to the sleeve 31, a highly reliable motor can be provided.

(Relationship between bush and sleeve)

Next, the relationship between the bush 24 and the sleeve 31 is demonstrated using FIG. FIG. 8: is a schematic cross section cut in the axial direction which expanded the periphery of the bush 24 and the sleeve 31. FIG.

The sleeve 31 is upwardly in the axial direction connecting the first inclined surface 311 having a diameter decreasing upwardly in the axial direction connecting the upper and outer peripheral surfaces of the sleeve 31 and the upper and inner peripheral surfaces of the sleeve 31. A second inclined surface 312 having an enlarged diameter, a third inclined surface 313 having an enlarged diameter in the lower axial direction connecting the lower surface and the inner circumferential surface of the sleeve 31, and the lower surface and the outer circumferential surface of the sleeve 31 are connected. Has a fourth inclined surface 314 whose diameter decreases downward in the axial direction. Here, the magnitude | size of the width | variety of the axial direction of the 1st inclined surface 311, and the width of the radial direction is the width of each axial direction of the 2nd inclined surface 312, the 3rd inclined surface 313, and the 4th inclined surface 314. And larger than the size of the width in the radial direction.

The inner circumferential surface of the holding cylindrical portion 411 of the housing 41 is provided to extend up to the axial direction upper side than the outer circumferential surface of the sleeve 31, and is provided to be axially lower than the upper surface of the sleeve 31. That is, the upper surface of the sleeve 31 is formed so that it may become axially upper side rather than the upper surface of the holding cylinder part 411. Further, an inclined surface 4111 is formed in which the inner diameter of the inner circumferential surface of the holding cylindrical portion 411 extends upward from the upper portion of the inner circumferential surface of the holding cylindrical portion 411 to the upper side. The width | variety of the radial direction enlarges the 3rd gap part G3 of this inclined surface 4111 and the 1st inclined surface 311 of the sleeve 31 toward an axial direction upper side. By this structure, the oil which soaked in the upper surface of the sleeve 31 by the rotation of the shaft 21 is accommodated in the 3rd space | interval G3. And oil will seep into the sleeve 31 again, and the bearing life of the sleeve 31 can be extended.

The first lower surface 243 of the bush 24 and the upper surface of the sleeve 31 face in the axial direction. And the inner periphery of the 1st inclined surface 311 and the outer periphery of the 1st lower surface 243 become substantially the same position in radial direction. The second lower surface 244 and the third lower surface 245 face the first inclined surface 311 in the axial direction. By this structure, even if the upper surface of the sleeve 31 approaches the lower surface of the bush 24, the adhesive and the upper surface of the sleeve 31 and the first inclined surface 311 can be prevented from contacting. Therefore, the magnitude | size of the axial direction of the sleeve 31 can be enlarged. The sleeve 31 may support the shaft 21 in the axial direction. As a result, the rotational vibration of the disk mounting portion 2311 can be reduced, and the bearing life can be extended.

The outer circumferential surface of the sleeve 31 is formed radially inward from the outer circumferential surface of the annular projection 242 of the bush 24. The upper surface of the holding cylindrical portion 411 of the housing 41 faces the lower end of the first cylindrical portion 2312 of the turntable 231 and the lower surface of the first flat portion 2313 in the axial direction.

The second planar portion 2315 of the turntable 231 is disposed below the upper surface of the sleeve 31 and the upper surface of the holding cylinder portion 411 of the housing 41 in the axial direction. That is, a part of the upper part of the sleeve 31 and a part of the upper part of the holding cylinder part 411 are accommodated in the annular recessed part 2317. This structure makes it possible to provide a thin motor while ensuring the size of the sleeve 31 in the axial direction.

Since the magnitude | size of the axial direction of the outer peripheral surface of the bush 24 is smaller than the magnitude | size of the axial direction of the inner peripheral surface of the 1st cylindrical part 2312, the lower surface of the bush 24 is lower than the lower surface of the 1st flat part 2313. It is formed above the axial direction. By this structure, the sleeve 31 can be enlarged further in the axial direction. Therefore, the sleeve 31 can support the shaft 21 elongate in the axial direction. As a result, the rotational vibration of the disk mounting portion 2311 can be reduced, and the bearing life can be extended. In particular, since the bush 24 and the shaft 21 are press-fitted, even if the size in the axial direction of the bush 24 itself becomes smaller than the size in the axial direction of the inner circumferential surface of the first cylindrical portion 2312, the bush 24 And a fastening force with the shaft 21 can be secured.

At an upper end of the holding cylindrical portion 411 of the housing 41, an annular protrusion 4112 protruding radially outward is formed. Moreover, in the inner periphery of the lower surface of the 2nd planar part 2315 of the turntable 231, the some protrusion part 251 which spaced apart in the circumferential direction which protrudes radially inward rather than the 2nd cylindrical part 2314 is provided. The eggplant preventing member 25 is fixed. Then, when the rotating body 2 moves upward in the axial direction with respect to the fixed body 4, the lower surface of the annular projection 412 of the holding cylinder portion 411 and the upper surface of the projection 251 of the release preventing member 25 are provided. This is in contact. Thereby, the movement of the rotating body 2 to the upper side in the axial direction with respect to the stationary body 4 is regulated.

The inner circumferential surface of the through hole of the base portion 2321c of the case 2321 is fixed to the outer circumferential surface of the first cylindrical portion 2312 of the turntable 231. And the planar part 2321c1 of the base part 2321c extends below the 1st planar part 2313, and is provided in radial direction outer side rather than the 2nd cylindrical part 2314. As shown in FIG.

(Production method of the motor)

Next, the manufacturing method of the motor 1 is demonstrated using FIGS. 9-11. 9 is a flowchart illustrating a manufacturing process of the motor 1. 10 and 11 are schematic diagrams illustrating a fixing process of the shaft 21, the bush 24, and the turntable 231.

The motor 1 is manufactured by manufacturing the rotating body 2 and the fixed body 4 beforehand, and embedding the rotating body 2 in the fixed body 4. Here, especially manufacture of the rotating body 2 is demonstrated.

The inner peripheral surface of the bush 24 is press-fitted to the outer peripheral surface of the shaft 21 (pressing process of step S1 of FIG. 9). As a result, the shaft 21 enters the through hole 241 of the bush 24. By press-fitting the bush 24 into the shaft 21, the bush 24 can be firmly fixed to the shaft 21.

Next, the turntable 231 is fixed to the outer circumferential surface of the bush 24 with an adhesive (gluing step in step S2 in FIG. 9). At this time, the rotor magnet 22 and the fall prevention member 25 are attached to the turntable 231. In this embodiment, for example, an ultraviolet curable adhesive is used. By using an ultraviolet curing adhesive, the bush 24 and the turntable 231 can be fixed easily and accurately.

Referring to FIG. 10, the fixing between the bush 24 and the turntable 231 is performed by the first jig 7 holding the shaft 21 and the second jig 8 holding the turntable 231. Run The first jig 7 is formed on the shaft retaining portion 71 having a cylindrical concave shape holding the shaft 21 and on the upper side in the axial direction and on the outer side in the radial direction than the shaft retaining portion 71, and the shaft 21. Is provided with a first plane portion 72 which is formed in a plane perpendicular to the direction in which)) extends (ie, a plane perpendicular to the axial direction). The second jig 8 has a turntable holding portion 81 holding the turntable 231 and a second flat portion formed in a plane perpendicular to the axial direction and lower than the turntable holding portion 81. 82 is provided. The turntable holding part 81 of this embodiment is an annular magnet, for example. The turntable 231 is held by the second jig 8 by sucking the second planar portion 2315 of the turntable 231 with this magnet.

When fastening the shaft 21 and the turntable 231, the 1st planar part 72 and the 2nd planar part 82 contact | connect (refer FIG. 11). In the state where the first planar portion 72 and the second planar portion 82 are in contact with each other, the outer circumferential surface of the bush 24 and the inner circumferential surface of the first cylindrical portion 2312 of the turntable 231 are attached through an adhesive. . In the upper part of the 2nd jig 8, the opening part 83 which irradiates the ultraviolet-ray of an ultraviolet irradiator (not shown), for example between the bush 24 and the 1st cylindrical part 2312 is formed. Thereby, the adhesive agent between the outer peripheral surface of the bush 24 and the inner peripheral surface of the 1st cylindrical part 2312 hardens. As a result, the bush 24 and the turntable 231 are fixed.

Here, the bonding step is applied to the inner circumferential surface of the turntable 231, the first bonding step of attaching and fastening the turntable 231 to the bush 24, and after the first bonding step, the bush 24 and It consists of a 2nd adhesion process which fills an adhesive agent with the curved part 2312c of the 1st cylindrical part 2312 of the turntable 231. FIG. By performing the second bonding step, the outer circumferential surface of the bush 24 and the inner circumferential surface of the first cylindrical portion 2312 can be reliably bonded in the axial direction. Therefore, the fastening force between the turntable 231 and the bush 24 can be improved. In addition, since the second lower surface 244 and the third lower surface 245 are formed on the lower surface of the bush 24, the second lower surface 244 and the third lower surface 245 can be prevented from entering the first lower surface 243 even if the adhesive is filled in the second bonding process. . Moreover, by forming the bent portion 2312c, it is possible to prevent the adhesive from invading radially outward from the bent portion 2312c. Therefore, a highly reliable motor can be provided.

Since a gap in the radial direction is formed between the outer circumferential surface of the bush 24 and the inner circumferential surface of the first cylindrical portion 2312 in the axial direction, the outer circumferential surface of the bush 24 is pressed by press-fitting the bush 24 and the shaft 21. Even if it is deformed, the deformation of the outer circumferential surface of the bush 24 is absorbed by the gap in the radial direction. Therefore, it is possible to prevent the inner peripheral surface of the first cylindrical portion 2312 of the turntable 231 from being deformed. As a result, rotational vibration of the disk mounting portion 2311 of the turntable 231 can be prevented. Therefore, the surface vibration of the disk can be reduced.

The turntable holding part 81 has a contact plane part 811 in contact with the upper end surface of the disk mounting part 2311. This contact plane portion 811 is a plane perpendicular to the axial direction.

Next, the chuck case 232 is attached to the outer circumferential surface of the first cylindrical portion 2312 of the turntable 231 (step S3 in FIG. 9). By this process, the rotating body 2 is completed.

And the rotating body 2 is attached to the fixed body 4 manufactured separately (step S4 of FIG. 9). This can receive the rotating body 2 in the fixed body 4 by inserting the shaft 21 into the sleeve 31.

(Overall Structure of Disk Drive Unit)

One embodiment of the disk drive device of the present invention will be described with reference to FIG. 12. 12 is a schematic cross-sectional view cut along the axial direction, showing one embodiment of the disc drive device of the present invention.

Referring to FIG. 12, the disc drive device 50 is coaxial with the rotation center of the disc 60 by being inserted into the aperture hole 61 of the disc-shaped disc 60 having the aperture hole 61 at the center. The spindle motor 51 for carefully rotating the disk 60, the optical pickup mechanism 52 for receiving light reflected from the disk 60 and emitting light to the disk 60; The optical pickup mechanism 52 is provided with a gear mechanism 53 which is a moving mechanism that performs movement in the rotational radial direction of the disk 60, and a housing body 54 containing these.

The spindle motor 51 and the optical pickup mechanism 52 are held by the chassis 55. By moving the chassis 55 at least in the axial direction, the opening hole 61 of the disk 60 is attached to the chucking device of the spindle motor 51. In addition, an opening hole is formed in the chassis 55, and the optical pickup mechanism 52 is disposed inside the opening hole.

The gear mechanism 53 includes a motor 531 having a gear as an output shaft, and a transmission side gear 532 to which the rotational torque of the motor 531 is transmitted.

In the housing body 54, a boundary plate 541 formed of a thin board which divides the movement of the disk 60 and the gear mechanism 53 is formed. In the housing body 54, an opening hole 542 for inserting and ejecting the disk 60 is formed.

The pick-up mechanism 52 includes a light-emitting light receiver 521 that emits light, for example, laser light or receives laser light reflected from the disk 60, and the disk 60 of the light-emitting light receiver 521. It is provided perpendicular to the movement direction in the rotational radial direction, and has the moving part 522 which performs the movement of the light-emitting light receiving part 521. This moving part 522 has an engaging part 522a which meshes with the to-be-transmitted side gear 532. The light-emitting light receiving portion 521 is moved in the radial direction by engaging with the moving portion 522.

When the gear part 531a mounted on the motor 531 and the gear side 532 are engaged, the gear side 532 is rotated, and the gear side 532 is moved from the moving part 522. By engaging the engaging portion 522a, the moving portion 522 moves in the rotational radial direction. And the light-emitting light-receiving part 521 moves by the movement of this moving part 522 in a rotating radial direction.

By applying the motor 1 of the present invention to the spindle motor 51 of the disk drive device 50, the lower surface of the disk 60 is vertically aligned with high precision with respect to the light irradiation direction of the optical pickup mechanism 52. Can be placed. Therefore, a disc drive device with high accuracy of recording and reproducing of the disc 60 can be provided.

Therefore, even if the disk 60 is mounted on the spindle motor 51, a highly reliable disk drive device that prevents recording and reproducing errors can be provided. In addition, since the disk drive device 50 itself can be thinned and the fastening strength between the bush 24 and the turntable 231 in the motor 1 is high, a highly reliable disk drive device can be provided. .

As mentioned above, although one Embodiment of the Example of this invention was described, this invention is not limited to this, A various deformation | transformation is possible within the scope of a claim.

For example, in the bearing mechanism 3 of this invention, although the sleeve 31 was used, this invention is not limited to this. For example, a spherical bearing such as a ball bearing may be used instead of the sleeve 31.

For example, although the chucking apparatus 23 of this invention used the some elastic member 2232 and the chucking claw part 2323, this invention is not limited to this. For example, the clamp member which suppresses the upper surface of a disk is provided in the disk drive apparatus side, and a chucking apparatus may be only a careful ring.

For example, although the 1st lower surface 243, the 2nd lower surface 244, and the 3rd lower surface 245 of the bush 24 of this invention were each connected by the inclined surface, this invention is limited to this structure. It doesn't work. For example, you may connect the 1st lower surface 243, the 2nd lower surface 244, and the 3rd lower surface 245 to the surface which is axial direction, respectively. Moreover, the combination of an axial surface and an inclined surface may be sufficient. For example, each of the first lower surface 243, the second lower surface 244, and the third lower surface 245 itself may be inclined to be connected.

For example, although the clearance gap G was provided in the bush 24 and turntable 231 of this invention over the axial direction, this invention is not limited to this. For example, a part of the bush 24 and the turntable 231 may be press-fitted in the axial direction.

Further, for example, the turntable 231 of the present invention includes a first cylindrical portion 2312, a first flat portion 2313, a second cylindrical portion 2314, a second flat portion 2415, and a third cylinder. Although it is comprised by the part 2316, this invention is not limited to this. Since the annular recessed part 2317 should just be formed in the turntable 231, the 1st planar part 2313 does not need to be formed. In this case, the second cylindrical portion 2314 has a substantially cylindrical shape whose diameter decreases toward the upper side in the axial direction. In this case, the connecting portion becomes a bent portion between the first cylindrical portion 2312 and the second cylindrical portion 2314.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic cross section cut in the axial direction which shows one form of the Example of the motor of this invention.

It is a top view seen from the top which showed one form of the Example of the chucking apparatus of this invention.

Fig. 3 is a plan view seen from above showing one embodiment of a turntable of the present invention.

4A and 4B show one embodiment of the turntable of the present invention, in which FIG. 4A is a schematic sectional view cut along the axial direction, and FIG. 4B is an enlarged view of the dotted circle in FIG. 4A.

5 is a schematic cross-sectional view cut in the axial direction showing the fastening structure between the shaft, the bush, and the turntable of the present invention.

6 is an enlarged view of the dotted circle of FIG. 5.

7A and 7B show the bush of the present invention, FIG. 7A is a schematic sectional view cut along the axial direction, and FIG. 7B is a plan view seen from the lower side.

Figure 8 is an enlarged view of Figure 1 showing the periphery of the bush and sleeve of the present invention.

9 is a flowchart illustrating a manufacturing process of the motor of the present invention.

10 is a schematic cross-sectional view cut along the axial direction showing the fastening process between the shaft, the bush and the turntable of the present invention.

11 is a schematic cross-sectional view cut in the axial direction showing the fastening process between the shaft, the bush and the turntable of the present invention.

It is a schematic cross section cut in the axial direction which shows one form of the Example of the disk drive apparatus of this invention.

(Description of the main parts of the drawing)

1 motor

2 rotator

21 shafts

22 rotor magnet

23 Chucking Device

231 turntable

2311 disk mounting part (mounting part)

2312 first cylindrical part (cylindrical part)

2312a Diameter Expansion (Shock Line)

2312b enlargement

2313 first flat part (connection part)

2314 2nd cylindrical part

2315 second flat part

2316 3rd cylindrical part

2317 Fantasy Concave

232 chuck case

2321 cases

2322 elastic member

2323 Chucking Claw

24 bush

242 annular projection

243 first

244 Second hand

245 Third

3 bearing mechanism

31 sleeve

311 first slope

312 second slope

313 Third Slope

314 fourth slope

4 fixture

41 housing

411 holding cylinder

4111 slope

G thickness

G1 first spacing

G2 2nd Spacing

J1 center axis (rotation axis)

Claims (21)

In a motor for rotating an annular disk having a central opening, The shaft which becomes the rotation axis, A cylindrical bush having an inner circumferential surface fixed to an outer circumferential surface of the shaft; A turntable having a cylindrical portion having an inner circumferential surface fixed to an outer circumferential surface of the bush, and a mounting portion formed radially outward from the cylindrical portion to mount the disk, The outer circumferential surface of the bush and the inner circumferential surface of the cylindrical portion of the turntable form a gap in the radial direction, The gap is filled with adhesive, On the outer circumferential surface of the bush, an annular projection having an annular projection shape in which the outer diameter of the outer circumferential surface is enlarged is formed. motor. The method of claim 1, Characterized in that the gap is provided between the outer circumferential surface of the bush and the inner circumferential surface of the cylindrical portion in the axial direction. motor. The method of claim 1, The gap between the outer circumferential surface of the bush and the inner circumferential surface of the cylindrical portion has a first spacing portion arranged along the axial direction and a second spacing portion having a larger spacing size than the first spacing portion. motor. The method of claim 3, wherein In the second spacing portion, an annular concave diameter enlargement portion in which the inner diameter of the inner circumferential surface is enlarged is formed on the inner circumferential surface of the cylindrical portion. motor. The method of claim 4, wherein The turntable is formed of a pressed magnetic body, The diameter expanding portion is formed by using a shock line generated during press working. motor. The method of claim 3, wherein The first spacing portion is formed in the axial direction lower than the second spacing portion, motor. The method of claim 3, wherein The first spacing portion is formed on the outer circumference of the annular projection portion motor. The method of claim 1, The magnitude | size of the axial direction of the outer peripheral surface of the said bush is below the magnitude | size of the axial direction of the inner peripheral surface of the said cylindrical part of the said turntable, It is characterized by the above-mentioned. motor. The method of claim 1, On the upper part of the inner circumferential surface of the cylindrical portion, there is formed an enlarged portion for expanding the diameter toward the upper side in the axial direction, The adhesive is characterized in that the filling up to the enlarged portion motor. The method of claim 1, On the inner circumferential surface of the cylindrical portion, an annular concave diameter enlarged portion is formed in which the inner diameter of the inner circumferential surface is enlarged. The annular projection is formed in the axial direction lower than the diameter expansion portion, characterized in that motor. The method of claim 1, The lower surface of the bush has a first lower surface and a second lower surface formed at different positions in the axial direction, The second lower surface is formed above the first lower surface in the axial direction and is formed radially outward from the first lower surface. motor. The method of claim 11, Between the said 1st lower surface and the said 2nd lower surface, the 3rd lower surface formed in the axial direction upper side rather than the said 2nd lower surface is formed, It is characterized by the above-mentioned. motor. The method of claim 1, Under the axial direction of the bush, a bearing mechanism for rotatably supporting the shaft is disposed, The turntable is formed with a flat portion formed radially outward from the cylindrical portion, The lower surface of the bush is formed on the upper side in the axial direction than the planar portion motor. The method of claim 1, Under the axial direction of the bush, a cylindrical sleeve made of a containing sintered material having an inner circumferential surface rotatably supporting the shaft is disposed, On the radially outer side of the sleeve, a housing having a holding cylinder having an inner circumferential surface for holding an outer circumferential surface of the sleeve is disposed, In the sleeve, An annular first inclined surface connecting the upper surface and the outer circumferential surface of the sleeve, An annular second inclined surface connecting the upper surface and the inner circumferential surface of the sleeve, An annular third inclined surface connecting the lower surface and the inner circumferential surface of the sleeve, An annular fourth inclined surface connecting the lower surface and the outer peripheral surface of the sleeve is provided, The width in the radial direction and the axial direction of the first inclined surface is greater than the width in each of the radial and axial directions of the second inclined surface, the third inclined surface and the fourth inclined surface, The inner circumferential surface of the holding cylinder portion is formed up to an axial direction upper side of the outer circumferential surface of the sleeve. motor. The method of claim 11, Under the axial direction of the bush, a cylindrical sleeve made of a sintered material having an inner circumferential surface rotatably supporting the shaft is disposed, On the radially outer side of the sleeve, a housing having a holding cylinder having an inner circumferential surface for holding an outer circumferential surface of the sleeve is disposed, In the sleeve, An annular first inclined surface connecting the upper surface and the outer circumferential surface of the sleeve is provided, The inner circumference of the first inclined surface is formed at the same position in the radial direction as the inner circumference of the second lower surface, or radially inward from the inner circumference of the second lower surface. motor. 13. The method of claim 12, Under the axial direction of the bush, a cylindrical sleeve made of a sintered material having an inner circumferential surface rotatably supporting the shaft is disposed, On the radially outer side of the sleeve, a housing having a holding cylinder having an inner circumferential surface for holding an outer circumferential surface of the sleeve is disposed, The sleeve is provided with an annular first inclined surface connecting the upper surface and the outer peripheral surface of the sleeve, The inner circumference of the first inclined surface is formed at the same position in the radial direction and the inner circumference of the third lower surface, or is formed radially inward from the inner circumference of the third lower surface. motor. The method of claim 1, The outer peripheral surface of the said cylindrical part of the said turntable is equipped with the chucking mechanism which adjusts so that the center of a disk and the said rotating shaft may correspond. motor. The method of claim 17, The chucking mechanism, A disc shaped case having an inner circumferential surface fixed to an outer circumferential surface of the cylindrical portion, A chucking claw portion in contact with the central opening provided in the disk and holding the disk; And an elastic member housed in the case and biasing the chucking claw portion outward in the radial direction. motor. In the disk drive apparatus mounted with the motor of Claims 1-18, An optical pickup mechanism for receiving light reflected from the disk or emitting light to the disk; And a moving mechanism for moving the optical pickup mechanism in the radial direction. Disk drive. The method of claim 1, The bush and the turntable is a part of the axial direction is press-fit motor. In a motor for rotating an annular disk having a central opening, The shaft which becomes the rotation axis, A cylindrical bush having an inner circumferential surface fixed to an outer circumferential surface of the shaft; A cylindrical portion having an inner circumferential surface fixed to an outer circumferential surface of the bush, A turntable having a mounting portion formed radially outwardly from the cylindrical portion on which the disk is mounted, The outer circumferential surface of the bush and the inner circumferential surface of the cylindrical portion of the turntable form a gap in the radial direction, The gap is filled with adhesive, The bush may include a first chamfer that connects the upper surface and the outer circumferential surface of the bush and decreases in diameter toward an axial upper side, and a second chamfer that connects the lower surface and the outer circumferential surface of the bush and increases in diameter toward an axial upper side. Characterized in that motor.

Images