KR100572861B1 - Auto Balancer and recording/reproducing Apparatus having the same - Google Patents

Abstract

The present invention relates to a self-aligning device for automatically correcting a rotational imbalance of a rotating body and a disc recording and reproducing device having the same. In the present invention, the space 37 is mainly formed between the outer cut 32 and the inner cut 33 formed on the lower surface of the turntable 30. The lower part of the main space 37 is formed by the ball case 35. The ball 40 is installed in the main space 37 to correct the rotation imbalance due to the rotation of the turntable 30. The ball contact portion 53 of the lock plate 50 selectively protrudes into the main space 37. An eccentric mass portion 52 is provided on the opposite side of the ball contact portion 53 of the lock plate 50 so that the lock plate 50 is driven by the centrifugal force caused by the rotation of the turntable 50. The locking plate 50 receives an elastic force by the spring 57 in the direction in which the ball contact portion 53 protrudes into the main space 37. According to the present invention, the ball 40, the turntable 30 travels mainly the space 37 only at a predetermined rotation speed or more, and once the driving is started, it is not smoothly and accurately because it is not disturbed by the locking plate 50. Rotational imbalance can be corrected.

Self-aligning, rotating body, ball, eccentric mass, centrifugal force

Description

Auto Watcher and Disc Reproducing Device Having the Same {Auto Balancer and recording / reproducing Apparatus having the same}

1 is a cross-sectional view showing the configuration of a conventional self-aligning device used in a disk drive.

Figure 2 is a plan sectional view showing the configuration of the self-aligning device shown in FIG.

3 is a cross-sectional view showing the configuration of another conventional self-aligning device used in a disk drive.

Figure 4a is a plan sectional view showing the configuration of a conventional automatic watch device shown in FIG.

Figure 4b is a state diagram showing the operation of the conventional self-aligning device shown in FIG.

Fig. 5 is a sectional view showing that a preferred embodiment of the automatic observing apparatus according to the present invention is applied to a disc recording and reproducing apparatus.

6 is a plan sectional view showing the configuration of the embodiment shown in FIG.

7 is an operating state diagram showing that the embodiment shown in Figure 5 is operated.

8 is a plan sectional view showing a configuration of another embodiment of the present invention.

9 is an operational state diagram showing another embodiment of the present invention in operation.

Explanation of symbols on the main parts of the drawings

20: spindle motor 22: rotor

24: axis of rotation 30: turntable

32: outer cut 32 ': outer circumferential surface

33: Inner side cut 33 ': Inner side surface

34: cutout 35: ball case

37: Mainly space 39: Boss

40: ball 50: locking plate

52: eccentric mass part 53: ball contact part

54: opening 56: spring projection

57: spring

The present invention relates to an automatic watch device, and more particularly, to an automatic watch device for automatically correcting a rotational imbalance of a rotating body and a recording / playback device having the same.

When the rotating body rotates, rotational imbalance may occur due to various causes. An apparatus for removing such a rotational imbalance is an automatic watchdog. Although the self-aligning device is used in various devices, in the present specification, a device for recording / reproducing a signal on a disc such as a CD or a DVD will be described.

As the speed of the disk drive is increased, rotational imbalance caused by the eccentric mass of the disk during the high speed rotation of the disk has been a problem. Such rotational imbalance of the disc causes vibration in the disc drive, which makes it difficult to accurately reproduce the signal recorded on the disc and to record the accurate signal on the disc.

Such a rotational imbalance of the disk is most often caused by a nonuniformity (when there is a center of gravity) of the disk itself, which is generated in the manufacture of the disk, and is particularly problematic as the disk rotation speed becomes higher. In addition, even when the disc is not correctly mounted on the turntable, rotational imbalance may occur.

The self-aligning device for solving the rotational imbalance of the disk can be classified into one provided in the clamp device for fixing the disk to the turntable and the spindle motor for rotating the disk, Figure 1 spindle motor It is shown that the configuration for the self-alignment on the side.

According to this, the ball case 9 is provided in the lower surface of the turntable 7 provided in the upper end of the rotating shaft 6. The ball case 9 is formed in the shape of a disc like the turntable 7 and forms an annular space in which a plurality of balls 10 are located in cooperation with the lower surface of the turntable 7. The inner surface outer wall of the space forms the outer main surface 9o on which the ball 10 travels, and the inner surface inner wall forms the inner main surface 9i. The ball case 9 penetrates through the center thereof, and the rotary shaft 6 is press-fitted.

In the space formed in the ball case 9, as shown in FIG. 2, a plurality of balls 10 for correcting the rotational imbalance at the time of rotation of the disk are provided. The ball 10 is formed of a metal material. The ball 10 performs a balancing action while traveling along the space inside the ball case 9 together with the rotation of the turntable 7.

That is, when the rotational speed of the disk is less than or equal to the natural frequency of the disk drive, the resonance center of the rotating shaft and the single mass center of the disk are located at opposite positions with respect to the rotation center of the disk.

If the rotational speed of the disk is approximately equal to the natural frequency of the drive, the resonance center of the rotational axis and the position of the center of mass of the disk are perpendicular to the rotational center of the disk.

When the disc is playing or recording, the rotation speed of the disc is larger than the natural frequency of the drive. At this time, the center of rotation of the disc and the center of mass of the disc are located in the same direction. . At this time, the ball 10 is located in the opposite direction between the center of rotation of the disk and the center of resonant center of the rotation axis and the center of mass of the disk to correct the mass eccentricity.

On the other hand, the lower portion of the ball case (9) is provided with a spindle motor (3), the rotor (5) of the spindle motor (3) is connected to the rotary shaft (6) to rotate integrally with the rotary shaft (6) It is installed. The spindle motor 3 is installed on the base 1.

It will be described that the automatic monitoring device according to the prior art having such a configuration is operated. The rotation shaft 6 is rotated by the rotation of the spindle motor 3, and the turn table 2 rotates the disk.

At this time, when the disk is rotated at a high speed to cause a rotational imbalance of the disk, the ball 10 inside the ball case 9 is relatively along the outer circumferential surface 9o of the ball case 9. As you move, the disc's rotational imbalance is corrected.

For example, in a disc having a eccentricity, the ball 10 is gathered at one side of the space in the ball case 9 to correct the eccentricity. If there is no eccentricity, the ball 10 is evenly aligned with the space in the ball case 9.

In the conventional self-aligning device as described above, there is a problem in that the ball cloud noise occurs when the spindle motor 3 starts to rotate or stops, and in particular, in the vicinity of a specific rotational speed of the disc, infinite cloud phenomenon in the range (aka ' There is a problem that it is difficult to use in a section of the rotational speed and vibration and noise generated while the hula hoop phenomenon ') occurs.

In order to overcome this problem, an automatic watch device having a configuration as shown in FIG. 3 has been proposed. That is, the inner circumferential surface 9i of the inside of the ball case 9 is constituted by the magnet 11. By such a configuration, the ball 10 is attached to the magnet 11 by magnetic force, as shown in FIG. 4A, and does not move up to a specific rotational speed. When the ball 10 reaches a specific rotational speed, the ball 10 is shown in FIG. 4B. As the ball 10 is separated by the centrifugal force from the magnet 11, the ball 10 travels along the space inside the ball case 9.

However, even in the prior art shown in FIG. 3, when the ball 10 is dropped or reattached from the magnet 11, noise and impact are generated, and the ball 10 is caused by the magnetic force of the magnet 11. ) Has a problem that the accuracy of the balancing operation is lowered because the cloud of the).

Accordingly, it is an object of the present invention to solve the problems of the prior art as described above, and to provide an automatic watchdog device which does not generate noise and impact while having high precision of operation.

Another object of the present invention is to provide a recording / reproducing apparatus for a disk medium having the above-described automatic observing device.

According to a feature of the present invention for achieving the above object, the present invention is an inner main surface and the outer main surface is formed in a predetermined interval disposed annular main space provided in the rotating body; A ball for correcting rotational imbalance of the rotating body while traveling inside the main space; By controlling the movement of the ball while moving in and out of the main space by the centrifugal force caused by the rotation of the rotating body, one end is provided with an eccentric mass portion having a relatively large mass, the opposite side of the eccentric mass portion It is provided with a ball contact portion for controlling the movement of the ball mainly in the space while moving in and out of the, the locking plate having an elastic force in the direction in which the ball contact portion is protruded into the main space by the support member.

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An opening part is provided between the eccentric mass part and the ball contact part, and the rotation center of the rotating body is located adjacent to the eccentric mass part in the opening part.

The locking plates are stacked and installed in opposite directions so that the eccentric mass parts are symmetrical.

According to another feature of the invention, the present invention is the inner main surface and the outer main surface is formed in a predetermined interval disposed annular main space provided in the rotating body; A ball for correcting rotational imbalance of the rotating body while traveling inside the main space; By controlling the movement of the ball while moving in and out of the main space by the centrifugal force caused by the rotation of the rotating body, one end is provided with an eccentric mass portion having a relatively large mass, the opposite side of the eccentric mass portion Is moved to the inside and outside of the ball is mainly provided with a contact portion for controlling the movement of the ball in the space, and is supported by the support member rotatably around the center of rotation provided between the eccentric mass and the ball contact portion, It comprises a locking plate provided with a plurality of points symmetrical to the center of rotation of the rotating body.

The tip of the ball contact portion is formed to have the same curvature as the inner main surface.

According to another feature of the invention, the invention is applied to the rotating body for rotating the disk of the self-aligning device of the above configuration.

The rotating body is a turntable on which the disk is mounted and rotates integrally.

According to the present invention having such a configuration, there is an advantage that it is possible to more accurately correct the rotational imbalance of the rotating body.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the self-aligning device according to the present invention and a disc recording and reproducing apparatus having the same will be described in detail.

FIG. 5 is a sectional view showing a configuration in which a preferred embodiment of the self-aligning device according to the present invention is applied to a spindle motor of a disk drive, and FIG. 6 is a plan sectional view showing a configuration of an embodiment of the present invention.

As shown in these figures, the spindle motor 20 is generally mounted on a pickup base (not shown) to provide power for rotating the disk. The spindle motor 20 is composed of a relatively fixed stator and a rotor 22 that is rotated by electromagnetic interaction with the stator. The rotating shaft 24 is integrally provided at the center of rotation of the rotor 22. The rotating shaft 24 protrudes above the rotor 22.

The turntable 30 is press-fitted to the rotation shaft 24. The turntable 30 has a disk seated on its upper surface and rotates the disk while rotating by the spindle motor 20. The turntable 30 is formed in a disc shape, and the outer cut 32 protrudes downward in a ring shape around the bottom edge thereof. The inner cut 33 is formed at a predetermined distance from the outer cut 32. The inner cut 33 is relatively less protruding than the outer cut 32, and is formed in a ring shape as a whole and a cutout portion 34 is formed at a position facing each other. The cutout 34 is formed such that the inner cut 33 is not formed or protrudes less than the inner cut 33 of another portion.

The ball case 35 is mounted below the turntable 30. The ball case 35 is installed in combination with the outer cut (32). The ball case 35 cooperates with the outer cut 32 and the inner cut 34 of the turntable 30 to form an annular main space 37. Reference numeral 39 denotes a boss 39 into which the rotary shaft 24 is press-fitted.

A plurality of balls 40 are accommodated in the main space 37. The ball 40 serves to compensate for rotational imbalance while traveling along the main space 37 when the turntable 30 rotates.

Meanwhile, a lock plate 50 is installed inside the inner cut 34 in a space formed by the lower portion of the turntable 30 and the ball case 35. The locking plate 50 serves to control the operation of the ball 40 in accordance with the rotational speed of the turntable 30, the ball 40 in the main space 37 at a predetermined rotational speed or more Do not drive.

The locking plate 50 is a plate having a predetermined thickness and is composed of an eccentric mass portion 52 having a relatively large area and a ball contact portion 53 integrally formed on the opposite side of the eccentric mass portion 52. . Of the eccentric mass portion 52 and the ball contact portion 53, the main surface 55 facing the outer main surface 32 ′ of the main space 37 is an inner main surface of the inner cut 33 ( 33 ') is formed to have a curvature corresponding thereto.

 An opening 54 is formed between the eccentric mass portion 52 and the ball contact portion 53, and the rotation shaft 24 passes through one side of the opening 54. One side of the opening 54 has a shape corresponding to an outer circumferential surface of the boss 39, and the other side of the opening 54 is formed such that an inner surface thereof does not come into close contact with the boss 39. The opening portion 54 has a position and an area determined so that the center of mass of the locking plate 50 is formed on the eccentric mass portion 52.

A spring protrusion 56 is formed in the opening 54 of the locking plate 50 to face the boss 39. The spring protrusion 56 protrudes in the opening portion 54 so as to face the eccentricity portion 52 in the ball contact portion 53. A spring 57 is supported by the spring protrusion 56. That is, the spring 57 is installed as an elastic member to surround the outer circumferential surface of the spring protrusion 56, one side of which is in close contact with the ball contact portion 53 side and the other side is in close contact with the outer circumferential surface of the boss 39. . Here, the spring 57 exerts an elastic force in the direction in which the ball contact portion 53 protrudes into the main space 37.

Both ends of the eccentric mass portion 52 and the ball contact portion 53 of the locking plate 50 are seated in the cutout portion 34 formed in the inner cut 33, respectively. The eccentric mass 52 and the ball contact portion 53 of the locking plate 50 are seated on the cutout 34 so that the locking plate 50 is not rotated and the elastic force of the spring 57 acts. Can be moved in the opposite direction.

Hereinafter will be described the operation of the present embodiment having the configuration as described above.

The self-aligning device of the present embodiment allows the ball 40 accommodated in the space 37 to travel mainly inside the space 37 only when the rotation speed of the turntable 30 is greater than or equal to a certain level. That is, normally, the ball contact portion 53 of the locking plate 50 protrudes into the main space 37, so that the ball 40 cannot travel along the main space 37.

In other words, as shown in FIG. 6, the ball contact portion 53 closely fixes the ball 40 to the outer circumferential surface 32 ′, or the tip and the outer circumferential surface 32 ′ of the ball adhesion portion 53. The distance between the () is narrower than the diameter of the ball 40 to prevent the ball 40 mainly travel the space (37).

In this state, when the spindle motor 20 is driven, the turntable 30 is rotated by the rotation shaft 26. When the rotational speed of the turntable 30 reaches a predetermined value or more, that is, the rotational speed at which the ball 40 does not exhibit infinite cloud phenomenon, the locking plate 50 is moved by the eccentric mass 52 by centrifugal force. , It moves to the right side with reference to the drawing, and it will be in the state as shown in FIG.

In other words, the locking plate 50 moves while overcoming the elastic force of the spring 57 so that the ball contact portion 53 does not protrude into the space 37 while entering the inside of the cutout 34, The main surface 55 guides the cloud of the ball 40 by forming an inner main surface, and thus, the ball 40 can travel inside the main space 37, thereby performing a careful action. .

On the other hand, in the present embodiment, an eccentricity may occur in the configuration including the turntable 30 by the eccentric mass portion 52 of the lock plate 50. This can be solved by placing a separate balance weight on the turntable 30 at a position opposite to the eccentric mass 52. In addition, a method of eliminating the eccentricity by using the two locking plates 50 in the opposite directions can be considered.

Next, another embodiment of the present invention is shown in FIG. In the present embodiment, the same parts as those in the embodiment shown in FIG. 5 have the same reference numerals, and description thereof will be omitted.

As shown in the figure, in the present embodiment, two locking plates 150 are installed on the inner side of the inner cut 33 so as to be point-symmetrical with respect to the rotation shaft 24. The locking plate 150 is rotatably installed around the rotation center 151, respectively. This is to prevent rotational imbalance from occurring in the entire turntable 30 by the locking plate 150 by the eccentric mass 152 which will be described below.

An eccentric mass portion 152 is provided at one end of the locking plate 150. The eccentric mass portion 152 serves to rotate the lock plate 150 by the eccentric mass during rotation of the turntable 30. And the ball contact portion 153 is provided on the opposite side of the eccentric mass portion 152 on the basis of the rotation center (151). The ball contact part 153 is installed to protrude mainly into the space 37 through the cutout 134 formed in the inner cut 33. The ball contact portion 153 is formed such that the portion 155 protruding into the main space 37 has a curvature corresponding to the inner circumferential surface 33 ′ of the inner cut 33.

On the other hand, the locking plate 150 is supported by a finger member (not shown) so that the ball contact portion 153 is rotated in a direction to protrude mainly into the space 37 with respect to its rotation center 151, respectively. . Therefore, the ball contact portion 153 of the lock plate 150 is protruded into the main space 37 to prevent the rotation of the ball 40 until the turntable 30 is rotated at a predetermined speed or more. .

It will be described below that this embodiment having the configuration as described above operates.

In this embodiment, the two locking plates 150 are installed to be point-symmetrical about the rotational shaft 24 to control the ball 40 to travel mainly along the space 37. That is, only when the rotational speed of the turntable 30 is above a certain level, the interior of the space 37 is allowed to travel mainly. When the turntable 30 is in a stopped state or the rotational speed is less than or equal to the locking plate 150, The ball contact portion 153 protrudes into the main space 37 so that the ball 40 cannot travel along the main space 37.

In other words, when the turntable 30 is stopped or the rotational speed is lower than a certain level, as shown in FIG. 8, the ball contact portion 153 closely fixes the ball 40 to the outer circumferential surface 32 ′, or The gap between the tip of the ball contact portion 153 and the outer circumferential surface 32 ′ is narrower than the diameter of the ball 40 so that the ball 40 does not travel mainly through the space 37.

In this state, when the spindle motor 20 is driven, the turntable 30 is rotated by the rotation shaft 26. When the rotational speed of the turntable 30 reaches a predetermined value or more, that is, the rotational speed at which the ball 40 does not exhibit infinite cloud phenomenon, the locking plate 150 is moved by the eccentric mass part 152 by centrifugal force. It rotates counterclockwise about the rotation center 151, and it is in the state as shown in FIG.

In other words, the locking plate 150 is rotated while overcoming the elastic force of the finger member by the centrifugal force by the eccentric mass of the eccentric mass 152, so that the ball contact part 153 forms the main space 37. The ball 40 may travel in the main space 37 by forming a plane continuous with the inner circumferential surface 33 ′ of the cut 33. Therefore, the ball 40 can be careful.

As described in detail above, the self-aligning device according to the present invention controls the running of the ball to operate the watch while the lock plate is operated by the centrifugal force by the eccentric mass, mainly traveling in the space.

That is, the locking plate has an advantage that the infinite cloud phenomenon does not occur in the self-aligning device because the ball is not able to travel mainly along the space in the area where the ball generates an infinite cloud phenomenon.

The locking plate is driven by the centrifugal force of the eccentric mass part when the turntable rotates at a predetermined speed or more, so that the ball does not prevent the ball from traveling mainly in space. Therefore, once the ball starts running, the effect that the automatic watch action can be performed more accurately can be obtained.

Claims (8)

delete An inner circumferential surface and an outer circumferential surface formed at predetermined intervals and having an annular main space provided in the rotating body; A ball for correcting rotational imbalance of the rotating body while traveling inside the main space; By controlling the movement of the ball while moving in and out of the main space by the centrifugal force caused by the rotation of the rotating body, one end is provided with an eccentric mass portion having a relatively large mass, the opposite side of the eccentric mass portion It is provided with a ball contact portion for controlling the movement of the ball in the main space while moving to the inside and outside of the, the ball contact portion by the support member has a locking plate having an elastic force in the direction protruding into the main space; Self-aligning device. The self-aligning device according to claim 2, wherein an opening is provided between the eccentric mass and the ball contact portion, and the rotation center of the rotating body is positioned adjacent to the eccentric mass. 4. The self-aligning device according to claim 3, wherein the locking plate is installed in a direction opposite to each other so that the eccentric mass parts are symmetrical. An inner circumferential surface and an outer circumferential surface formed at predetermined intervals and having an annular main space provided in the rotating body; A ball for correcting rotational imbalance of the rotating body while traveling inside the main space; By controlling the movement of the ball while moving in and out of the main space by the centrifugal force caused by the rotation of the rotating body, one end is provided with an eccentric mass portion having a relatively large mass, the opposite side of the eccentric mass portion Is moved to the inside and outside of the ball is mainly provided with a contact portion for controlling the movement of the ball in the space, and is supported by the support member rotatably around the center of rotation provided between the eccentric mass and the ball contact portion, And a locking plate provided with a plurality of points in symmetry with respect to the center of rotation of the rotating body. The self-aligning device according to any one of claims 2 to 5, wherein the tip of the ball contact portion is formed to have the same curvature as the inner main surface. A disk recording and reproducing apparatus having an automatic monitoring device according to claim 6, wherein the automatic monitoring device is applied to a rotating body for rotating the disk. 8. The disc recording and reproducing apparatus according to claim 7, wherein the rotating body is a turntable on which the disc is seated and rotated integrally.

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