JP2000152556A - Balance correcting device and rotating apparatus equipped with the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable surely to correct fine unbalance. SOLUTION: A partition wall 28 wherein the external form is almost triangular and each of the three parts corresponding to vertexes forms an almost arcuate is disposed upright inside a partition wall disposed upright on an interlock member. Inside the arcuate parts of the partition wall 28, almost arcuate partition walls 29 are disposed upright. The arcuate parts of the partition wall 28 and the inside partition walls 29 form almost arcuate moving paths 30 which are mutually divided every central angle of 120 deg.. One or more spherical bodies 31 as rolling elements are contained movably in the peripheral direction in each of the moving paths, and a second balance correcting device 22 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a balance correcting device which is attached to a rotating device such as a motor and corrects imbalance during rotation, and a rotating device provided with the same.

[0002]

2. Description of the Related Art Generally, there are various types of motors.
One of them is a recording disk drive for recording and reproducing data. There are various types of recording disks such as CD, FD, MO, MD, and DVD. Since these recording disks have different specifications such as recording / reproducing method, data capacity, rotation speed, recording density, etc., and materials and prices of the disks, there are various motors for driving each disk.

[0003] In recent years, electronic information has shifted from characters to images, and the accompanying advancement and sophistication of information has made it possible to record and reproduce such information in large quantities and quickly and at a low cost. There is a need for a recording disk and a driving device for driving the recording disk.

[0004] For example, in the case of a CD, it first appeared for music reproduction, but its advantages have been extended to CD-ROMs for computers. As a result, the data capacity increases, the operation time (seek time) is shortened, and the recording disk side is rotated faster, that is, the motor for driving the recording disk is sped up. A speed exceeding 20 times speed has been realized.

Now, a specific configuration of a conventional recording disk drive motor will be described with reference to FIG.

As shown in FIG. 8, a lower end of a substantially cylindrical holding member 2 as a stationary member is fitted into an opening formed in a fixing member 1 such as a chassis. The obstruction plate 3 is closed, the thrust receiver 4 is placed on the obstruction plate 3, disposed on the bottom of the holding member 2, and the slide bearing 5 is fitted inside the holding member 2.

Further, a core 7a is fitted on the outside of the holding member 2, and a winding 7b is wound around the core 7a to form a stator 7 as a stationary member. Further, a shaft 8 which is a rotating member is fitted into the slide bearing 5, a lower end of the shaft 8 is in contact with the thrust receiver 4, and an upper end thereof is arranged to protrude above the holding member 2. A hub member 9 as a rotating member made of a non-magnetic material such as aluminum is fitted to the upper end of the shaft 8, and a yoke member 10 as a rotating member made of a magnetic material such as iron is attached to the hub member 9. .

The yoke member 10 comprises a substantially disc-shaped base and a hanging part which is formed to be integrally formed by hanging down on the periphery of the base, and around the opening formed in the center of the base. The portion is attached to the lower end of the hub member 9 by caulking. Further, a driving magnet 11 is fitted inside the hanging portion of the yoke member 10 and is disposed at a position facing the stator 7.

As shown in FIG. 8, a turntable portion 13 is formed outside the hub member 9, and a clamp magnet 14 is buried in the center of the hub member 9 so as to be substantially flush with the upper surface. This clamp magnet 1
By 4, the disk pressing means (not shown) of the drive unit is magnetically attracted, and the recording disk D is fixed. Then, the direction of current flow to the winding 7b of the stator 7 is controlled, and the stator 7 generates a rotating magnetic field. By repeating the attraction and repulsion of the rotating magnetic field and the static magnetic field with the driving magnet 11, the stationary magnetic field is stopped. The driving magnet 11, the yoke member 10, the hub member 9 and the shaft 8 rotate with respect to the stator 7 in the state, whereby the turntable portion 13 and the recording disk D rotate in a certain direction.

[0010] By the way, the increase in the speed of the motor causes an imbalance in weight balance due to dimensional errors or the like of the respective parts, which has not been a problem until then, and a balance correction device for correcting such imbalance. Conventionally, as shown in, for example, FIGS. 8 and 9, the lower surface of the turntable portion 13 of the hub member 9 and the base portion of the yoke member 10 form an accommodation portion 16 of an annular space. A motor is equipped with a balance correction device 18 that accommodates a sphere 17 movably in the circumferential direction.

[0011]

However, CD-ROMs
In the recording disk D, etc., various printings are made on the surface opposite to the recording surface, and slight imbalance occurs in the recording disk D due to the weight of the ink used for printing. If it is extremely small, the above-mentioned annular space containing portion 16 and a plurality of spheres 17 contained therein are contained.
The motor cannot be completely corrected by the balance correcting device 18 comprising the recording disk D or the like, which has extremely low unbalance. In the case where the correction device 18 is provided, there is a problem that the rotational shake becomes larger.

Further, in a motor rotated by mounting a recording disk D or the like having a small unbalance, if the above-described balance correction device 18 is provided, the vibration value of the rotational shake changes every time the motor is started even if the same motor is used. There is also the problem of doing.

A possible cause of these problems is that the sphere 17 which is a balance corrector in the balance correction device 18 cannot be moved to the balance correction point accurately due to, for example, frictional force during rotation of the motor. Is distributed within a certain range including.

An object of the present invention is to make it possible to reliably correct a minute imbalance.

[0015]

In order to solve the above-mentioned problems, a balance correcting device according to the present invention comprises an interlocking member that rotates in conjunction with a rotating member, and the interlocking member that rotates about a rotation axis of the rotating member. It is characterized by comprising a plurality of moving paths formed by partitioning the member at predetermined center angles, and a balance body movably accommodated in each of the moving paths.

According to such a configuration, the balance body is
The movement range is significantly limited only by moving within each moving path formed by dividing the interlocking member at an equal position,
The balance body can be kept almost in a restrained state. Therefore, when the motor is rotated with a disk with little unbalance, the occurrence of unbalance due to the movement of the balance body can be suppressed as much as possible, and the minute unbalance is caused by the movement of the balance body in the moving path. Corrected reliably.

At this time, it is preferable that the entire outer shape of the interlocking member is substantially polygonal, and a portion corresponding to each vertex has a substantially arc shape by a curve. If a moving path is formed at each of the apexes having a substantially circular arc shape, a moving path can be formed by dividing the rotating member at predetermined center angles around the rotation axis, and the balance body can be formed in the moving path. It is possible to move smoothly and quietly.

Further, the balance correcting device according to the present invention is characterized in that each of the moving paths is formed by a partition wall or a partition wall. In this case, by using the interlocking member having a wall surface having a substantially polygonal outer shape, each moving path can be easily formed by the wall surface at each vertex and the partition wall or the partition wall.

Further, the balance correcting device according to the present invention is characterized in that each of the moving paths is formed of a concave portion such as a groove, a hole, or the like, which is formed on the interlocking member at every predetermined center angle. In this case, by forming a groove or a hole at each vertex of the interlocking member having a substantially polygonal overall shape, each moving path can be easily formed at each predetermined center angle.

Further, in the balance correction device according to the present invention, the balance body is formed of a rolling element.
In this case, the rolling element has an advantage that the friction when moving in the moving path is small, and the handling when accommodating in the moving path is easy.

Further, the rotating device according to the present invention comprises a stationary member and a rotating member rotatably provided with respect to the stationary member, and an interlocking member that rotates in conjunction with the rotating member; A balance correction device including a plurality of moving paths formed by partitioning the interlocking member at predetermined center angles around the rotation axis of the moving body and a balance body movably accommodated in each of the moving paths. It is characterized by having.

According to such a configuration, it is possible to minimize the occurrence of imbalance due to the movement of the balance member during rotation of the interlocking member accompanying rotation of the rotation member, and to correct the imbalance by the balance member. Points are distributed in the moving path, and minute imbalances are surely corrected. Therefore, it is possible to provide a rotation device such as a motor having stable rotation performance.

Further, the rotating device according to the present invention is characterized in that each of the moving paths is formed by a partition wall or a partition wall. In this way, if an interlocking member having a substantially polygonal wall surface is used as a whole, each moving path can be easily formed by the wall surface at each apex portion and the partition wall or the partition wall, and the minute unbalance can be obtained. And a rotation device with a balance correction device capable of correcting the above.

Further, in the rotating device according to the present invention, the moving path may include a groove formed in the interlocking member at each of the predetermined center angles.
It is characterized by comprising a concave portion such as a hole. In this way, by forming a groove or a hole at each apex of the interlocking member, the entire outer shape of which is substantially polygonal, each moving path can be formed at each predetermined center angle, and a balance capable of correcting a minute imbalance. A rotation device with a correction device can be provided.

Further, the rotating device according to the present invention is characterized in that the balance body comprises a rolling element. In this case, if the rolling element is used, the friction when moving in the moving path is small, and the handling when accommodating in the moving path is easy, and a balance correction device capable of correcting a minute imbalance is provided. A rotating device can be provided.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. This embodiment is an example of a recording disk drive motor as a rotating device provided with a balance correction device. FIG. 1 is a side view showing a schematic configuration, FIG. 2 is a partial schematic diagram, and FIGS. It is a schematic diagram of each modification example.

In the present embodiment, the basic structure of the motor is substantially the same as that of the conventional motor described above, and the only difference is the following point. That is, in the present embodiment, as shown in FIG.
6 and a first balance correction device 21 for correcting a large unbalance composed of a plurality of spheres and a storage portion formed of an annular space, similarly to the balance correction device 18 composed of the plurality of spheres 17 accommodated therein. In addition, a second balance correction device 22 for correcting minute imbalance is provided.

At this time, an interlocking member which rotates in conjunction with the shaft 8 which is a rotating member is separately provided, and the first and second balance correction devices 21 and 22 are formed on the interlocking member. That is, as shown in FIG. 1, an interlocking member 23 having a circular outer shape and a U-shaped cross section and having a peripheral wall 23a is prepared, and the interlocking member 23 is attached to the shaft 8 so that the shaft 8 penetrates the center thereof.

On the inner side of the peripheral surface 23a of the interlocking member 23, a ring-shaped partition wall 24 is erected to form a peripheral wall 23 of the interlocking member 23.
a and a partition wall 24, a housing portion 25 composed of an annular space is formed, and a plurality of spheres 26 such as steel balls are provided in the housing portion 25.
To form a first balance correction device 21.

Further, as shown in FIG. 2, a partition wall 28 having a substantially triangular outer shape and a portion corresponding to three vertices forming a substantially arc shape is erected inside the partition wall 24, and the partition wall 28 is formed. A substantially arc-shaped partition wall 29 is erected on the inner side of the arc-shaped portion, and the arc-shaped portion of the partition wall 28 and each of the inner partition walls 29 form a substantially arc-shaped moving path 30. Are formed at every central angle of 120 °, and one or a plurality of spherical bodies 31 as rolling bodies are accommodated in these moving paths 30 so as to be movable in the circumferential direction. Is formed.

As described above, the second balance correction device 22 is formed by forming the substantially arc-shaped moving paths 30 at the positions corresponding to the respective vertices of the triangle and accommodating the spheres 31 therein. Each sphere 31 moves only in each moving path 30 in each moving path, and its moving range is significantly limited.

Therefore, when the motor is rotated with the recording disk D that is slightly unbalanced due to printing or the like, each sphere 31 immediately moves to the unbalance correction point in the moving path 30. I do. Accordingly, minute imbalance is corrected by the second balance correction device 22.

Therefore, according to the first embodiment described above, not only can a large imbalance be corrected by the first balance correction device 21, but also a small imbalance can be corrected by the second balance correction device 22. Therefore, it is possible to provide a recording disk drive motor having extremely stable rotation performance.

The first and second balance correcting devices 21 and 22 are attached to an interlocking member 23 provided separately from the motor components.
Are formed into a unit, so that the unitized two balance correcting devices 21 and 22 can be detachably attached to the recording disk drive motor and other rotating devices as necessary.

As a modification of the second balance correction device 22, instead of the partition wall 28 shown in FIG. 2, for example, as shown in FIG. A partition wall 33 having a portion corresponding to the three vertices and having a substantially arc shape formed by a part of a parabola is erected.
A substantially circular partition wall 34 is erected on the inside of the partition wall 33, and an arcuate portion of the partition wall 33 and each of the partition walls 34 inside the partition wall 33 form a moving path 35 having a substantially circular arc at every central angle of 120 °. A second balance correction device 22 is formed by forming one or a plurality of spheres 36 as rolling bodies in each of the moving paths 35 so as to be movable in the circumferential direction. You may.

As a modified example of the second balance correcting device 22, instead of the partition wall 28 shown in FIG.
As shown in FIG. 3, a circular partition wall 38 is erected inside the partition wall 24 (see FIG. 1), and a partition wall 39 having a substantially arc shape formed by a part of an ellipse is formed between the partition walls 24 and 38. Each of the moving paths 40, which is erected at a central angle of 60 ° and has a substantially circular arc shape between the partition wall 38 and each of the partition walls 39, is formed at every central angle of 60 °. The second balance correction device 22 may be formed by accommodating one or a plurality of spheres 41, which are rolling elements, as a balance body in the inside so as to be movable in the circumferential direction.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIG. This embodiment is different from the above-described first embodiment in that, as shown in FIG. 5, two balance correction devices, that is, first and second balance correction devices 21 and 22 are provided as shown in FIG. Without
The only difference is that only a balance correction device 45 for correcting minute imbalance is provided.

The balance correction device 45 in this case has basically the same configuration as the second balance correction device 22 in FIG. That is, a substantially arc-shaped moving path 48 is formed at every predetermined center angle by a partition wall 47 or the like on an interlocking member 46 which rotates in conjunction with the shaft 8 of the motor, and a spherical body 49 as a balance body is formed in each of the moving paths 48. Are accommodated to constitute a balance correction device 45. At this time, the moving path 48 may have a shape as shown in any of FIGS.

Therefore, the second embodiment is effective when the unbalance of the recording disk D is extremely small, and the balance correction can be performed by the balance correction device 45, and the stable Thus, it is possible to obtain the rotation characteristics of the motor.

As a third embodiment of the present invention,
Each of the substantially arc-shaped moving paths 30, 35, and 40 in the second balance correction device 22 of FIGS. 1 to 4, and each of the substantially arc-shaped moving paths 48 of the balance correction device 45 of FIG.
Instead, as shown in FIG. 6, a plurality of arc-shaped partition walls 51 are arranged on the circumference at a predetermined center angle (for example, 120 °), and an arc-shaped moving path 52 is formed between the partition walls 51 at 120 °. A balance correction device 54 which is formed by dividing each central angle, and which accommodates one or a plurality of spheres 53 as a balance body in each of these moving paths 52 and corrects a minute imbalance may be configured. .

Further, as a fourth embodiment of the present invention,
As shown in FIG. 7, a moving path 56 consisting of a concave portion such as a groove or a hole having a substantially arc shape is formed on the upper surface of the disk-shaped interlocking member 55 at every predetermined center angle (for example, 120 °). A balance correction device 58 may be configured to be divided and accommodate one or a plurality of spheres 57 as a balance body in each of the moving paths 56 to correct a minute imbalance.

Further, in each of the above-described embodiments, a case has been described in which the balance correction device is formed as a unit on an interlocking member different from the motor component, but the turn of the hub member 9 as the motor component is performed. A balance correction device may be formed on the table portion 13 and the base of the yoke member 10 (see FIG. 8), and the motor may be integrated with the balance correction device. In this case, the turntable portion 1 of the hub member 9
3 corresponds to an interlocking member.

Further, when the first and second balance correction devices 21 and 22 as shown in FIG. 1 are provided, one balance correction device is integrated with the motor and the other balance correction device is unitized. You may make it attach to a motor detachably.

The second balance correcting device 22 in FIGS. 1 to 4 and the balance correcting device 4 in FIG.
5 describes a case in which a substantially arc-shaped moving path is formed at each vertex of a polygon such as a triangle or a hexagon, but it is needless to say that a polygon other than a triangle or a hexagon may be used. Also, the moving path formed at each vertex does not need to be particularly arc-shaped, and in short, it is sufficient to form a moving path having such a shape that the balance body can be moved only in a very small range while holding the balance body almost at the vertex. .

Further, in each of the embodiments described above, the case where the balance body is the spheres 31, 36, 41, 53, and 57 has been described. However, the balance body does not necessarily have to be a sphere, and may be a barrel type, a cone type, or the like. Other rolling elements, and may be a fluid or a semi-fluid.

In each of the above embodiments, the case where the present invention is applied to a motor in which the shaft 8 rotates is described. However, the present invention is also applicable to an inner rotor type motor and a motor in which the shaft is fixed. Of course, the present invention can be applied.

Further, the present invention can be applied not only to the motor as in the above-described embodiments, but also to all rotating devices which have a rotating shaft and can cause imbalance during rotation. It is possible.

The present invention is not limited to the above-described embodiments, and various changes other than those described above can be made without departing from the spirit of the present invention.

[0049]

As described above, according to the first aspect of the present invention, the moving range of the balancer is limited to each of the moving paths formed by dividing the balancer by a predetermined central angle, so that the balancer is almost completely removed. Because it can be held in the restrained state, it is possible to suppress the occurrence of imbalance due to the movement of the balance body when the interlocking member rotates with the rotation of the rotation member with less imbalance, and the balance body moves in the moving path. This makes it possible to cancel the minute imbalance of the rotating member, and it is possible to further stabilize the rotation of the rotating device by performing accurate balance correction.

According to the second aspect of the present invention, each moving path can be easily formed.

According to the third aspect of the present invention, each moving path can be easily formed for each predetermined center angle.

According to the fourth aspect of the present invention, since the balancer is a rolling element, friction when moving in the moving path is small, and handling when accommodating in the moving path is easy. become.

According to the fifth aspect of the present invention, it is possible to provide a rotating device such as a motor which can surely correct even a slight imbalance and has a stable rotating performance. Become.

According to the sixth aspect of the present invention, it is possible to easily provide a rotating device with a balance correcting device capable of easily forming each moving path and correcting a minute imbalance. .

According to the seventh aspect of the present invention, there is provided a rotating device provided with a balance correcting device for fine balance correction, which can easily form each moving path for each predetermined center angle and has a simple configuration. be able to.

According to the eighth aspect of the present invention, it is possible to obtain a balance correction device that requires less friction when moving in the moving path and is easy to handle when housed in the moving path. In addition, it is possible to provide a rotation device with a balance correction device for fine balance correction.

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic configuration of a first embodiment of the present invention.

FIG. 2 is a schematic view of a part of the first embodiment.

FIG. 3 is a schematic diagram of a partial modification of the first embodiment.

FIG. 4 is a schematic diagram of another modification of a part of the first embodiment.

FIG. 5 is a side view showing an outline configuration of a second embodiment of the present invention.

FIG. 6 is a schematic view of a part of a third embodiment of the present invention.

FIG. 7 is a schematic view of a part of a fourth embodiment of the present invention.

FIG. 8 is a cutaway front view of a conventional example.

FIG. 9 is a partial plan view of a conventional example.

[Explanation of symbols]

2 Holding member (stationary member) 7 Stator (stationary member) 8 Shaft (rotating member) 9 Hub member (rotating member) 10 Yoke member (rotating member) 13 Turntable part (interlocking member) 22 Second balance correction device 23, 46, 55 Interlocking member 24, 28, 29, 33, 34, 38, 39, 47 Partition wall 30, 35, 40, 52, 56 Moving path 31, 36, 41, 53, 57 Spherical body (balanced body) 51 Partition wall 54 , 58 Balance correction device

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference)

Claims (8)

[Claims] An interlocking member that rotates in conjunction with the rotating member; a plurality of moving paths formed by dividing the interlocking member at predetermined center angles around a rotation axis of the rotating member; And a balance body movably accommodated in a moving path. 2. The balance correction device according to claim 1, wherein each of the moving paths is formed by a partition wall or a partition wall. 3. The balance correction device according to claim 1, wherein each of the moving paths includes a concave portion such as a groove or a hole formed in the interlocking member at each of the predetermined center angles. 4. The balance correction device according to claim 1, wherein the balance body is made of a rolling element. 5. An interlocking member comprising a stationary member and a rotating member rotatably provided with respect to the stationary member, the interlocking member rotating in conjunction with the rotating member, and a rotation axis of the rotating member as a center. And a balance correcting device including a plurality of moving paths formed by partitioning the interlocking member at predetermined center angles and a balance body movably accommodated in each of the moving paths. Rotating device. 6. The rotating device according to claim 5, wherein each of the moving paths is formed by a partition wall or a partition wall. 7. The rotating device according to claim 5, wherein each of the moving paths comprises a concave portion such as a groove or a hole formed in the interlocking member at each of the predetermined center angles. 8. The rotating device according to claim 5, wherein the balance body is made of a rolling element.