JP3683424B2 - Balance correction device and rotating device provided with the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a balance correction device that is attached to a rotation device such as a motor and corrects an unbalance during rotation, and a rotation device including the balance correction device.
[0002]
[Prior art]
In general, there are various types of motors, one of which is for driving a recording disk for recording / reproducing data. There are various recording disks such as CD, FD, MO, MD, and DVD. Since these recording disks have different specifications such as recording / reproducing system, data capacity, rotation speed, recording density, etc., or disk materials and prices, there are various types of motors for driving each disk.
[0003]
In recent years, electronic information has shifted from text to images, and the accompanying sophistication and increase in capacity have made it possible to record and reproduce such information in large quantities and quickly, as well as low cost. There is a demand for a driving device for driving the same.
[0004]
For example, in the case of a CD, it first appeared for music playback, but taking advantage of it, the application has been expanded to a computer as a CD-ROM. As a result, the data capacity increases, the operating time (seek time) is shortened and the recording disk side is rotated rapidly, that is, the speed of the recording disk drive motor is increased. As a result, a speed exceeding 20 times speed has been realized.
[0005]
A specific configuration of a conventional recording disk driving motor will be described with reference to FIG.
[0006]
As shown in FIG. 8, the lower end of the holding member 2 as a stationary member having a substantially cylindrical shape is fitted into the opening formed in the fixing member 1 such as the chassis, and the bottom opening of the holding member 2 is the closing plate 3. The thrust receiver 4 is placed on the closing plate 3 and disposed on the bottom of the holding member 2, and the sliding bearing 5 is fitted inside the holding member 2.
[0007]
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 constitute a stator 7 which is a stationary member. Further, a shaft 8 as a rotating member is fitted into the slide bearing 5, and a lower end thereof is disposed in contact with the thrust receiver 4, and an upper end portion protrudes above the holding member 2. A hub member 9 as a rotating member made of a nonmagnetic material such as aluminum is fitted to the upper end portion of the shaft 8, and a yoke member 10 which is a rotating member made of a magnetic material such as iron is attached to the hub member 9. .
[0008]
The yoke member 10 is composed of a substantially disk-shaped base and a hanging portion that is integrally formed by hanging downward on the periphery of the base, and a portion around an opening formed in the central portion of the base is a hub. It is attached to the lower end of the member 9 by caulking. Further, the driving magnet 11 is fitted inside the hanging portion of the yoke member 10 and is disposed at a position facing the stator 7.
[0009]
Further, as shown in FIG. 8, a turntable portion 13 is formed outside the hub member 9, and a clamp magnet 14 is embedded in the center of the hub member 9 so as to form substantially the same surface as the upper surface. 14, the disk pressing means on the drive device side (not shown) is magnetically attracted to fix the recording disk D. 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 between the rotating magnetic field and the static magnetic field of the driving magnet 11, the stator 7 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, and thereby the turntable portion 13 and the recording disk D rotate in a certain direction.
[0010]
By the way, increasing the speed of the motor has caused a weight balance deviation (unbalance) due to dimensional error of each part, which has not been a problem until now, and as a balance correction apparatus for correcting such an unbalance, For example, as shown in FIGS. 8 and 9, the lower surface of the turntable portion 13 in the hub member 9 and the base portion of the yoke member 10 form an annular space accommodating portion 16, and a plurality of spheres 17 are formed in the accommodating portion 16. A balance correction device 18 that is housed in a circumferentially movable manner is incorporated in a motor.
[0011]
[Problems to be solved by the invention]
However, in the recording disk D such as a CD-ROM, various printing is performed on the surface opposite to the recording surface, and a slight imbalance occurs in the recording disk D due to the weight of ink used for printing. If the imbalance is extremely small, the balance correction device 18 comprising the annular space accommodating portion 16 and the plurality of spheres 17 accommodated therein cannot be completely corrected, and the recording is very little unbalanced. In the motor rotated with the disk D or the like mounted thereon, there is a problem that the rotational shake becomes larger when the balance correction device 18 is provided than when the balance correction device 18 is not provided.
[0012]
Further, in a motor rotated by mounting a recording disk D or the like with a small unbalance, if the balance correction device 18 described above is provided, the vibration value of the rotational vibration changes every time the motor is started. There is also.
[0013]
A possible cause of these problems is that the sphere 17 that is a balance corrector in the balance correction device 18 cannot accurately move to the balance correction point due to, for example, frictional force or the like when the motor rotates. It may be distributed with variation within the range.
[0014]
The problem to be solved by the present invention is to make it possible to reliably correct a slight imbalance.
[0015]
[Means for Solving the Problems]
In order to solve the above-described problems, a balance correction apparatus according to the present invention divides an interlocking member that rotates in conjunction with a rotating member, and the interlocking member at a predetermined center angle about the rotation axis of the rotating member. And a balance body accommodated in each of the movement paths so as to be movable only within the movement path .
[0016]
According to such a configuration, the balance body is remarkably limited only by moving in each moving path formed by dividing the interlock member into equal positions, and the balance body can be held almost in a restrained state. . Therefore, when a motor with a disk with little unbalance mounted is rotated, the occurrence of unbalance due to the movement of the balance body can be suppressed as much as possible, and a slight unbalance can be caused by the balance body moving in the movement path. Correctly corrected.
[0017]
At this time, it is desirable that the interlocking member has a substantially polygonal outer shape, and a portion corresponding to each vertex has a substantially arc shape by a curve. Then, if a moving path is formed at each apex portion having a substantially arc shape, the moving path can be formed by dividing the rotating body into predetermined central angles around the rotation axis of the rotating member, and the balance body can be formed in the moving path. Can be moved smoothly and quietly.
[0018]
Moreover, the balance correction apparatus of 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, by using an interlocking member having a substantially polygonal wall surface as a whole, each moving path can be easily formed by the wall surface of each vertex portion and the partition wall or partition wall.
[0019]
Furthermore, the balance correction apparatus of the present invention is characterized in that each of the moving paths is formed of a recess such as a groove or a hole processed in the interlocking member for each of the predetermined center angles. If it carries out like this, each moving path can be easily formed for every predetermined | prescribed center angle by forming a groove | channel or a hole in each vertex part of the interlocking member in which the whole external shape comprises substantially polygonal shape.
[0020]
In the balance correction apparatus of the present invention, the balance body is a rolling element. In this case, if it is a rolling element, the friction at the time of moving in a movement path may be small, and there exists an advantage that the handling at the time of accommodating in a movement path becomes easy.
[0021]
Further, the rotation device of the present invention, the stationary member and is therefore configured to rotate member provided rotatably relative to the stationary member, and the interlocking member that rotates in conjunction with the rotary member, rotation of said rotary member A plurality of moving paths formed by dividing the interlocking member at predetermined center angles around an axis, and a balance body accommodated in each moving path so as to be movable only within the moving path It is characterized by having a balance correction device comprising:
[0022]
According to such a configuration, when the interlocking member rotates along with the rotation of the rotating member, it is possible to minimize the occurrence of unbalance due to the movement of the balance body, and the balance body moves to the unbalance correction point. It is distributed in the road and the slight imbalance is reliably corrected. Accordingly, it is possible to provide a rotating device such as a motor having stable rotation performance.
[0023]
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 whose overall outer shape has a substantially polygonal wall surface is used, each moving path can be easily formed by the wall surface of each apex portion and the partition wall or partition wall, and a slight imbalance can be formed. It is possible to provide a rotation device with a balance correction device capable of correcting the above.
[0024]
Furthermore, the rotating 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 or a hole formed in the interlocking member for each predetermined central angle. In this way, by forming grooves or holes in each apex part of the interlocking member whose overall outer shape is almost polygonal, each movement path can be formed for each predetermined center angle, and a balance that can correct a slight unbalance. A rotation device with a correction device can be provided.
[0025]
In the rotating device of the present invention, the balance body is a rolling element. In this case, if it is a rolling element, the friction at the time of moving in the moving path is small, and handling at the time of accommodating in the moving path becomes easy, and a balance correction apparatus with a small unbalance can be corrected. A rotating device can be provided.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. The present embodiment is an example of a recording disk driving 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 the schematic of each one part modification.
[0027]
In the present embodiment, the basic configuration of the motor is substantially the same as the conventional one described above, and only the following points are greatly different. That is, in the present embodiment, as shown in FIG. 1, the annular space is similar to the balance correction device 18 including the accommodating portion 16 and the plurality of spheres 17 accommodated in the annular space in FIGS. In addition to the housing portion and the first balance correction device 21 for correcting a large unbalance consisting of a plurality of spheres, a second balance correction device 22 for correcting a slight unbalance is provided.
[0028]
At this time, an interlocking member that rotates in conjunction with the shaft 8 that 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 23 a is prepared, and the interlocking member 23 is attached to the shaft 8 so that the shaft 8 penetrates the center thereof.
[0029]
A ring-shaped partition wall 24 is erected on the inner side of the peripheral surface 23 a of the interlocking member 23, and a housing portion 25 including an annular space is formed by the peripheral wall 23 a and the partition wall 24 of the interlocking member 23. A first balance correction device 21 is formed by accommodating a plurality of spheres 26 such as steel balls.
[0030]
Further, as shown in FIG. 2, a partition wall 28 is erected on the inner side of the partition wall 24 so that the outer shape is substantially triangular and the portions corresponding to the three vertices are substantially arc-shaped. A substantially arcuate partition wall 29 is erected on the inner side of the part forming the arc, and the arcuate part of the partition wall 28 and the inner partition walls 29 form a substantially arcuate moving path 30 of 120 °. And a second balance correction by accommodating one or a plurality of rolling bodies, which are rolling elements, in the respective movement paths 30 so as to be movable in the circumferential direction. A device 22 is formed.
[0031]
As described above, each of the spheres 31 is formed by forming the substantially arcuate movement path 30 at a position corresponding to each apex portion of the triangle and accommodating the sphere 31 therein to form the second balance correction device 22. Each moving path 30 only moves in each moving path, and its moving range is significantly limited.
[0032]
Therefore, when the recording disk D that is not slightly balanced due to printing or the like is mounted and the motor is rotated, each sphere 31 immediately moves to the unbalance correction point in the movement path 30. Therefore, a slight imbalance is corrected by the second balance correction device 22.
[0033]
Therefore, according to the first embodiment described above, not only the first balance correction device 21 can correct a large imbalance, but also the second balance correction device 22 corrects a slight unbalance. Therefore, a recording disk drive motor having very stable rotation performance can be provided.
[0034]
Further, since the first and second balance correction devices 21 and 22 are formed on the interlocking member 23 provided separately from the constituent members of the motor to form a unit, it is necessary for the recording disk drive motor and other rotating devices. Accordingly, both of these unitized balance correction devices 21 and 22 can be detachably mounted.
[0035]
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. 3, each side has a curved shape even if the outer shape is the same triangle. A partition wall 33 in which a portion corresponding to one vertex forms a substantially arc shape by a part of a parabola is erected, and a substantially circular partition wall 34 is erected on the inside of the partition wall 33, and the arc shape of the partition wall 33 is formed. A moving path 35 having a substantially circular arc shape is defined by a central angle of 120 °, and one or a plurality of balance bodies are formed in each moving path 35. The second balance correction device 22 may be formed by accommodating the spheres 36 as individual rolling elements so as to be movable in the circumferential direction.
[0036]
Further, 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. 4, a circular partition wall 38 is placed inside the partition wall 24 (see FIG. 1). A partition wall 39 having an almost circular arc shape formed by a part of an ellipse is erected between the partition walls 24 and 38 at every central angle of 60 °, and between the partition wall 38 and each partition wall 39. A substantially circular arc-shaped moving path 40 is formed by dividing it at each central angle of 60 °, and one or a plurality of rolling bodies spheres 41 are moved in the circumferential direction as balance bodies in the respective moving paths 40. The second balance correction device 22 may be formed by being accommodated freely.
[0037]
(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIG. In this embodiment, the difference from the first embodiment described above is that, as shown in FIG. 5, two balance correction devices, ie, first and second balance correction devices 21 and 22 are provided as shown in FIG. In other words, only the balance correction device 45 for correcting a slight unbalance is provided.
[0038]
The balance correction device 45 in this case basically has the same configuration as the second balance correction device 22 in FIG. That is, a substantially arc-shaped moving path 48 is formed for each predetermined central angle by the partition wall 47 and the like on the interlocking member 46 that rotates in conjunction with the motor shaft 8, and a sphere 49 as a balance body is formed in each of the moving paths 48. Is accommodated to constitute a balance correction device 45. The moving path 48 at this time may be shaped as shown in any of FIGS.
[0039]
Therefore, according to the above-described second embodiment, it is effective when the imbalance of the recording disk D is extremely small, and the balance correction device 45 can perform balance correction, thereby stabilizing the motor. It becomes possible to obtain rotational characteristics.
[0040]
As a third embodiment of the present invention, each of the substantially arcuate movement paths 30, 35, and 40 in the second balance correction device 22 of FIGS. 1 to 4 and the substantially circular shape of the balance correction device 45 of FIG. As shown in FIG. 6, a plurality of arc-shaped partition walls 51 are arranged on the circumference at predetermined central angles (for example, 120 °) instead of the arc-shaped movement paths 48, and the arc-shaped movement between the partition walls 51 is performed. A path 52 is divided into 120 ° central angles, respectively, and each of the movement paths 52 accommodates one or a plurality of spheres 53 as balance bodies to correct a slight imbalance. May be configured.
[0041]
Further, as a fourth embodiment of the present invention, as shown in FIG. 7, a concave portion such as a substantially arc-shaped groove or hole is formed on the upper surface of the disk-like interlocking member 55 every predetermined central angle (for example, 120 °). The movement path 56 is divided into 120 ° central angles, and one or a plurality of spheres 57 as balance bodies are accommodated in each of the movement paths 56 to correct a slight imbalance. 58 may be configured.
[0042]
Further, in each of the above-described embodiments, the case where the balance correction device is formed as a unit by forming an interlocking member different from the motor constituent member has been described, but the turntable portion 13 of the hub member 9 that is a motor constituent member is described. Alternatively, a balance correction device may be formed at the base portion of the yoke member 10 (see FIG. 8), and the balance correction device may be integrated into the motor. In this case, the turntable portion 13 of the hub member 9 corresponds to the interlocking member.
[0043]
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 into the motor, and the other balance correction device is unitized and attached to the motor. You may make it mount | wear freely.
[0044]
In the second balance correction device 22 in FIGS. 1 to 4 and the balance correction device 45 in FIG. 5, a substantially arc-shaped moving path is formed at each vertex of a polygon such as a triangle or a hexagon. As described above, it is of course possible to use polygons other than triangles and hexagons, and the movement path formed at each vertex does not need to be particularly arcuate. In short, the balance body is almost constrained to the vertex. It is only necessary to form a moving path that is held in a state and can move only in a very small range.
[0045]
Furthermore, in each of the above-described embodiments, the case where the balance body is the sphere 31, 36, 41, 53, 57 has been described. However, the balance body does not necessarily have to be a sphere, and other types such as a barrel shape and a cone shape may be used. It may be a rolling element, or a fluid or semi-fluid.
[0046]
In each of the above-described embodiments, the case where the present invention is applied to a motor that rotates the shaft 8 has been described. However, the present invention is applied to an inner rotor type motor or a motor that has a fixed shaft. Of course, it can be applied.
[0047]
Furthermore, the present invention can be applied not only to the motor as in the above-described embodiments, but also to all rotating devices that have a rotating shaft and can cause an unbalance during rotation. It is.
[0048]
The present invention is not limited to the above-described embodiments, and various modifications other than those described above can be made without departing from the spirit of the present invention.
[0049]
【The invention's effect】
As described above, according to the first aspect of the present invention, the balance body can be held almost in a restrained state by restricting the movement range of the balance body to each movement path formed by dividing the balance body at predetermined central angles. Therefore, at the time of rotation of the interlocking member accompanying the rotation of the rotating member with little unbalance, the occurrence of unbalance due to the movement of the balance body can be suppressed, and the rotation of the rotating member by moving the balance body in the moving path. The minute imbalance can be canceled out, and the rotation of the rotating device can be further stabilized by highly accurate balance correction.
[0050]
Moreover, according to the invention of Claim 2, each moving path can be formed easily.
[0051]
In addition, according to the third aspect of the present invention, each moving path can be easily formed for each predetermined central angle.
[0052]
According to the fourth aspect of the present invention, since the balance body is a rolling element, friction when moving in the moving path is small, and handling when accommodated in the moving path is facilitated.
[0053]
According to the fifth aspect of the present invention, it is possible to reliably correct even a slight imbalance, and to provide a rotating device such as a motor having stable rotating performance.
[0054]
Further, according to the sixth aspect of the present invention, it is possible to easily provide a rotating device with a balance correction device that can easily form each moving path and correct a slight unbalance.
[0055]
In addition, according to the seventh aspect of the present invention, it is possible to provide a rotating device that can easily form each moving path for each predetermined center angle and includes a balance correction device for fine balance correction with a simple configuration. .
[0056]
According to the eighth aspect of the present invention, it is possible to obtain a balance correction apparatus that requires only a small amount of friction during movement in the movement path and is easy to handle when accommodated in the movement path. It becomes possible to provide a rotation device with a balance correction device for 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 view of a modification of a part of the first embodiment.
FIG. 4 is a schematic view of another modification of a part of the first embodiment.
FIG. 5 is a side view showing a schematic 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 cut front view of a conventional example.
FIG. 9 is a plan view of a part 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 (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 Movement path 31, 36, 41, 53, 57 Sphere (Balanced Body)
51 Bulkhead 54, 58 Balance correction device

Claims (8)

An interlocking member that rotates in conjunction with the rotating member;
A plurality of movement paths formed by dividing the interlocking member at predetermined central angles around the rotation axis of the rotating member;
A balance correction apparatus comprising: a balance body housed in each of the movement paths so as to be movable only in the movement path . The balance correction apparatus according to claim 1, wherein each of the moving paths is formed by a partition wall or a partition wall. The balance correction device according to claim 1, wherein each of the moving paths includes a recess such as a groove or a hole formed in the interlocking member for each predetermined central angle. 4. The balance correction apparatus according to claim 1, wherein the balance body is a rolling element. A stationary member and a rotating member rotatably provided with respect to the stationary member thus configured,
An interlocking member that rotates in conjunction with the rotating member;
A plurality of movement paths formed by dividing the interlocking member at predetermined central angles around the rotation axis of the rotating member;
A rotation device comprising a balance correction device including a balance body accommodated in each of the movement paths so as to be movable only in the movement path . 6. The rotating device according to claim 5, wherein each of the moving paths is formed by a partition wall or a partition wall. 6. The rotating device according to claim 5, wherein each of the moving paths includes a recess such as a groove or a hole processed in the interlocking member for each predetermined central angle. The rotating device according to claim 5, wherein the balance body includes a rolling element.

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