KR20000009374U - Self Compensation Balancer - Google Patents

Abstract

Disclosed is a self-compensating balancer which is capable of suppressing the vibration of the initial movable member by regulating the movement of the movable member when rotating at a rotation speed of less than the natural frequency.

Disclosed is a self-compensating balancer for a disc player comprising: a main body having an annular race formed about an axis of rotation of a rotating body; Magnetic material installed inside the race; A movable member movably positioned in the race and having at least one nonmagnetic body and at least one magnetized magnetic body disposed adjacent to the nonmagnetic body; And a cover member coupled to the main body to cover the race. The mutual magnetic influence between the movable members is excluded.

Description

Self Compensation Balancer

The present invention relates to a self-compensating dynamic balancer, and in detail, the structure is improved to suppress the vibration of the initial movable member by regulating the movement of the movable member when rotating at a rotation speed of less than the natural frequency. Self-compensated balancer.

In general, a disc player is a device that records information on an optical disc or reproduces recorded information in a non-contact manner by optical pickup.

As the disc player increases or decreases the rotational speed of the spindle motor employed therein, there is a fear that internal vibration is greatly generated. Such internal vibration is attributable to eccentric mass due to, for example, errors in the manufacturing process of the disc. In addition, such an eccentric mass may have a rotational center of rotation due to a mismatch between the rotational center of gravity and the center of gravity of the rotating body. In order to suppress such internal vibration, a self-compensating balancer is employed.

As shown in FIG. 1, a conventional self-compensating balancer is coupled to a lower portion of a turntable 1 having a guide protrusion 1a for guiding a position of a disk (not shown) to be seated. This self-compensating balancer includes a main body 3 having a retracted race 4, a magnet 6 coupled around the inner wall of the race 4, and a plurality of movable members 5 placed in the race 5. And a cover member 7 coupled to the main body 3. The turntable and the self-compensation type balancer have coupling holes 1b, 3a and 7a formed at their centers, respectively, and the rotation shaft 9a of the spindle motor 9 is provided in the coupling holes 1b, 3a and 7a. ) Is combined. Thus, the turntable 1 and the self-compensating balancer are rotated by the rotational force provided by the spindle motor 9.

The movable member 5 is composed of a plurality of magnetic balls made to allow the spindle motor 9 to stick to the outside of the magnet 6 by a magnetic force with the magnet 6 during the on-time or low speed rotation. Here, the low speed means a case where the centrifugal force applied to the self-compensation balancer by the spindle motor 9 is smaller than the magnetic force acting between the movable member 5 and the magnet 6.

The self-compensating balancer for the disc player configured as described above is coupled to the lower end of the turntable 1 to compensate for internal vibration due to the eccentric mass when the turntable 1 rotates at a speed higher than the natural frequency. In addition, since the movement of the movable member 5 is restricted by the magnet 6 when the turntable 1 is rotated or stopped at a low speed, internal noise due to the movement of the movable member 5 is reduced. In addition, the movable member 5 can easily beat gravity when the disc player is disposed and used in the vertical direction. However, in the self-compensating balancer for a disc player constructed as described above, one movable member 5a and the other movable members 5b and 5c adjacent to the movable member 5a are caused by a magnetic force acting therebetween. Since they stick to each other, there is a problem in that the balancing position is prevented by magnetic interference between neighboring movable members during balancing operation, thereby degrading balancing performance.

In order to solve this problem, the applicant has disclosed a self-compensating balancer having a structure in which magnetic force does not act between movable members through Korean Patent Application No. 97-69176.

The present invention has been made in view of the above-mentioned problems, and is an improvement of the above-described prior art. There is this.

1 is a partial perspective view showing a general self-compensating balancer.

Figure 2 is a schematic exploded perspective view showing a self-compensated balancer according to an embodiment of the present invention.

3 is a cross-sectional view of FIG.

<Description of the symbols for the main parts of the drawings>

11 ... body 12 ... race 13 ... guide protrusion

20 ... Movable member 21 ... Non-magnetic body 23 ... Magnetic magnetic body

30.Cover member 40 ... Magnetic member 50 ... Spindle motor

In order to achieve the above object, the present invention provides a self-compensating balancer coupled to the rotating body so as to suppress internal vibration caused by the eccentric mass of the rotating body for a disc player: A body having an annular lace formed; A magnetic body installed inside the race; A movable member movably positioned within said race, said movable member having at least one nonmagnetic body and at least one magnetized magnetic body disposed adjacent said nonmagnetic body; And a cover member coupled to the main body to cover the race.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The self-compensating balancer according to the embodiment of the present invention is adopted in the rotating body to suppress the internal vibration due to the eccentric mass of the optical disk.

2 and 3 illustrate an example in which a self-compensating balancer according to an embodiment of the present invention is integrally formed on a rotating body, that is, a turntable for a disc player.

As shown, the self-compensating balancer includes a main body 11 having an annular race 12 formed therein, a magnetic body 40 installed on the outer circumference of the inner wall of the race 12 or installed in a predetermined space therein, (12) a cover member (30) coupled to the movable member (20) and the main body (11), which is placed inside the cover, to cover the race (12).

The main body 11 has a disk mounting portion 11a on which the optical disk is mounted, and has a guide protrusion 13 formed at the center thereof to guide the mounting of the optical disk. In addition, a coupling hole 11b is formed at the center of the guide protrusion 13. The coupling hole 11b is coupled to the rotation shaft 51 of the spindle motor 50 that provides the rotational force. Therefore, the main body 11 is rotated according to the rotational force provided by the spindle motor 50.

The movable member 20 includes at least one nonmagnetic rigid body 21 and at least one magnetized magnetic rigid body 23 disposed adjacent to the nonmagnetic rigid body 21. In the present embodiment, an example in which a plurality of the nonmagnetic rigid bodies 21 and the magnetized magnetic rigid bodies 23 are arranged in the race 12 will be described.

The nonmagnetic rigid body 21 does not have mutual magnetic force with the magnetic body 40 located in the race 12. On the other hand, the magnetized magnetic rigid body 23 is rotated at a low speed so that the main body 11 stops or is weaker than the mutual magnetic force with the magnet 40, and adheres to the magnetic body 40 when the centrifugal force is small.

That is, magnetic interference between the movable member 20 can be eliminated by alternately disposing the non-magnetic rigid body 21 and the magnetized magnetic rigid body 23 in the race 12. Therefore, when rotating above the natural frequency of the main body 11, since the centrifugal force is larger than the above-mentioned magnetic force, the movable member 20 is located in the race 12 with the magnetic member 40 separated, and the movable member 20 is Since they do not stick together, a normal balancing operation can be performed. On the other hand, the magnetic bodies 23 are magnetized to the magnetic body 40 during the stop or low speed rotation to regulate the movement of the movable member 20 in the race (12). Accordingly, the generation of noise due to the movement of the movable member 20 within the race 12 can be suppressed, and the movable member 20 can easily overcome gravity when the main body 11 is disposed vertically. do.

Here, the self-compensating balancer of the present invention has been described with reference to the drawings of the structure in which the main body 11 is integrally formed on the turntable, but this is merely illustrative, and is integrally formed or coupled to the rotatable body which is rotatably installed. Can be.

Self-compensating balancer according to the present invention having the configuration as described above has the following effects.

First, by installing a magnetic body inside the race, and by placing the magnetic and non-magnetic rigid body in the race adjacent to the body by restraining the movement of the movable member by the mutual magnetic force of the magnetic body and the magnetic body during the stop and low-speed rotation In addition, noise reduction and unbalancing can be suppressed.

Second, since there is little magnetic influence between the magnetized magnetic body and the non-magnetic body, when the main body rotates at a rotation speed higher than the natural frequency, magnetic interference between neighboring movable members is excluded, thereby achieving accurate balancing operation.

Although the present invention has been described with reference to the embodiments shown in the accompanying drawings, this is only an example, and those skilled in the art may understand that various modifications and equivalent other embodiments are possible therefrom. will be.

Claims (1)

In the self-compensating balancer coupled to the rotating body so as to suppress the internal vibration caused by the eccentric mass of the rotating body for the disc player: A main body having an annular lace formed to be retracted about a rotation axis of the rotating body; A magnetic body installed inside the race; A movable member movably positioned within said race, said movable member having at least one nonmagnetic body and at least one magnetized magnetic body disposed adjacent said nonmagnetic body; And And a cover member coupled to the main body to cover the race. The self-compensating balancer of claim 1, wherein mutual magnetic influences between the movable members are excluded.