KR100243201B1 - Self-compensating dynamic balancer and disk player having the same - Google Patents

Abstract

Disclosed are a self-compensating dynamic balancer that suppresses internal vibration caused by an eccentric mass of a rotating body, and a disc player employing the same.

The disclosed self-compensating balancer includes: a body having a retracted annular lace; A movable member placed inside the race such that the center of gravity of the spindle motor is opposed to the center of gravity of the disk by the centrifugal force when the disk is rotated; Including the cover member to cover the opening of the race; suppress the internal excitation force of the rotating body at a natural frequency or more.

Disclosed disc player is coupled to at least one of its rotating body, that is, the rotor of the spindle motor, the axis of rotation of the spindle motor, the turntable, the clamper, the vibration compensation by the internal force of the disc player Suppress

Therefore, the disclosed disc player is suitable as a high speed CD, CD-ROM drive of 6 times or more.

Description

Self-compensating dynamic balancer and disk player having the same}

The present invention relates to a self-compensating dynamic balancer (Self-Compensating Dynamic Balancer) that suppresses the internal vibration due to the eccentric mass of the rotating body and a disc player employing the same.

In general, a disc player is a device for recording or reproducing information on a recording medium such as a compact disc (CD) or a digital video disc (DVD). It is necessary to protect the disc and optical pickup from external shock and internal vibration. .

As shown in FIG. 1, a general disc player includes a deck base 10 hinged to a housing (not shown) and rotatably coupled in a vertical direction, and a deck plate 20 coupled to the deck base 10. And a spindle motor 21 installed on the deck plate 20 to provide rotational force to the disk 1, and a turntable 23 coupled to the rotation shaft 22 of the spindle motor 21 and on which the disk 1 is placed. And a clamper 40 installed on the upper inner surface of the housing to face the turntable 23 and clamping the disk 1 on the turntable 23 in the radial direction of the disk 1 on the deck plate 30. It is composed of an optical pickup 25 coupled to be transportable to perform a recording / reproducing operation. The disc player is adapted to prevent the external vibration transmitted through the deck base 10 from being directly transmitted to the deck plate 20, the spindle motor 21, and the optical pickup 25. 20 is provided with a buffer member (30). The shock absorbing member 30 uses a material having a weak rigidity such as soft rubber or polyurethane, which is capable of absorbing external shocks well.

The disk player provided as described above can effectively protect the driving of the disk 1 and the optical pickup 25 from external shock by employing the above-mentioned shock absorbing member 30. On the other hand, a method of mitigating internal vibration caused by the rotation of the spindle motor 21 by the eccentric mass of the disk 1 has not been considered. Here, the eccentric mass of the disk 1 is due to a discrepancy between the rotational center of gravity and the center of gravity of the disk 1 due to an error in the manufacturing process of the disk. The rotation shaft 22 of the spindle motor 21 is moved by whirling. Make it idle.

The influence of the rotation of the spindle motor rotation is not a big problem in the low speed models such as 1x and 2x speeds, but the high speed models such as 6x and 8x speeds make the recording and playback of information difficult. It is becoming.

In view of this, the disc player of the high speed model of the related art increases the mass of the deck plate on which the spindle motor is installed or increases the rigidity of the shock absorbing member so as to mitigate the movement of the deck plate due to the eccentric mass of the disc.

If the deck plate is made large in mass, the effect is not sufficient at high speed, and it becomes an obstacle to cost increase and miniaturization. When the rigidity of the shock absorbing member is increased, there is a disadvantage in that it does not effectively block vibration or shock transmitted from the outside.

In addition, in the case of the general small high-speed rotating body, as in the above-described disc player, no method for effectively suppressing the influence of the internal vibration of the rotating body due to the eccentric mass has not been provided.

Accordingly, the present invention has been made in view of the above-described points, and has a first object to provide a self-compensating balancer that is adapted to a rotating body to suppress internal vibration due to eccentric mass.

It is also a second object of the present invention to provide a disc player employing a self-compensating balancer which is capable of fundamentally suppressing internal vibration due to eccentric mass of a disc without increasing external vibration and increasing mass.

1 is a schematic exploded perspective view showing a conventional disc player.

2A to 2C are schematic views showing the positional relationship between the eccentric mass position and the rotational axis with respect to the revolution center according to the rotational speed of the rotor.

Figure 3 is an exploded perspective view of a self-compensating balancer according to an embodiment of the present invention.

4 to 9 are partial perspective views showing the shape and type of the movable member employed in the race of the self-compensating balancer according to the embodiment of the present invention.

10 to 12 are each a cross-sectional view of a self-compensating balancer showing the inner form of the race in accordance with embodiments of the present invention.

13 is a cross-sectional view of a self-compensating balancer according to another embodiment of the present invention.

14A and 14B are schematic views showing the positional relationship between the eccentric mass position and the rotational axis with respect to the revolution center according to the rotational speed of the rotating body having the self-compensating balance according to the present invention.

15 is a schematic exploded perspective view showing a disc player employing a self-compensating balancer according to an embodiment of the present invention.

16 is a schematic cross-sectional view of a disc player according to an embodiment of the present invention shown for explaining a turntable provided with a self-compensating balancer.

FIG. 17 is a schematic cross-sectional view of a disc player according to an embodiment of the present invention, in which a self-compensating balancer is shown for explaining a spindle motor installed on the outer periphery of a case;

18 is an exploded perspective view illustrating a spindle motor in which a self-compensated balancer is installed on a rotating shaft.

19 is a cross-sectional view for explaining an embodiment of a clamper according to the present invention employing a self-compensating balancer.

20 is a cross-sectional view for explaining another embodiment of the clamper according to the present invention employing a self-compensating balancer.

<Explanation of symbols for main parts of drawing>

1.Disc 100 ... Rotator 200 ... Self Compensation Balancer

210 ... body 210a ... hollow 215 ... lace

220 ... cover member 300 ... movable member 310 ... rigid

320 Fluid 410 Deck base 420 Shock absorber

430 ... deck plate 435 ... optical pickup 440 ... clamper

445 Clamper body 446 Pressing means 447

448.Pressure plate 449,468 ... Elastic member 450 ... Turntable

451 Mounting member 453 Coupling protrusion 455 Magnet

460 ... spindle motor 461 ... motor base 462 ... stator

463 yoke 464 coil 465 rotary shaft

469a, 469b ... Bearing 470 ... Rotator 471 ... Case

472 Magnet 473

Self-compensating balancer according to the present invention to achieve the first object, the annular body having an inlet-shaped race coupled to the center of rotation of the rotating body; A movable member movably placed in the race; A cover member coupled to the body to cover the opening of the race; It is characterized in that the body is installed on the rotating body to compensate for the eccentric mass of the rotating body when rotating.

In order to achieve the above-mentioned second object, a disc player according to the present invention comprises a deck base, a deck plate elastically coupled to the deck base, and between the deck base and the deck plate to protect the deck plate from external impact. The buffer member, the spindle motor installed on the deck plate and providing rotational force to the disk, the turntable on the rotating shaft of the spindle motor, on which the disk is placed, and the clamper to hold the disk on the turntable; A disc player provided on the deck plate so as to be transported in a radial direction of a disc and having an optical pickup for recording and / or reproducing information on the disc. Coupling and installing at least one of the turntable and the clamper A body having a retracted annular lace; A movable member placed inside the race such that the center of gravity of the spindle motor is opposed to the center of gravity of the disk by the centrifugal force when the disk is rotated; A cover member covering the opening of the lace; Characterized in that it further comprises a self-compensating balancer comprising.

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

First, referring to FIGS. 2A to 2C, the positional relationship between the eccentric mass position of the rotating body 100 and the rotating shaft with respect to the revolution center according to the rotating speed of the rotating body 100 is as follows.

)에서 소정 거리 이격된 위치

에 불평형질량 즉, 편심질량(

)이 존재하는 경우, 회전체(100)의 회전중심(

)은 공전중심(c)를 원점으로

로 변위되면서 공전운동을 하게 된다. 회전중심

각각에 대응되는 회전중심의 편심질량(

) 위치는

위치로 변위된다. 이때 공전중심(c)과 회전체(100)의 편심질량(

) 각각의 위치

는 상기 회전체(100)의 회전중심(

,

) 각각을 기준으로 서로 반대 위치에 놓인다.Figure 2a is a schematic diagram showing the revolution and rotation of the rotating body 100, when the rotational speed of the rotating body 100 is less than the natural frequency of the rotating body itself. Here, the natural frequency is determined by the elastic modulus existing between the mass of the rotating body 100 and the fixing member (not shown) to which the rotating body 100 is coupled and installed in a direction perpendicular to the rotation axis. Say the frequency. As shown, the center of rotation of the rotor 100 (

) At a distance from

In unbalanced mass, ie eccentric mass (

If present, the center of rotation of the rotating body (100)

) Is the origin of revolution (c)

It is displaced into and makes an orbital movement. Rotation center

Eccentric mass of the center of rotation corresponding to each

) Location is

Displaced into position. At this time, the eccentric mass of the revolution center (c) and the rotating body (

) Each position

Is the center of rotation of the rotating body (100)

,

) Are placed opposite each other with respect to each other.

,

) 각각을 기준으로 공전중심(c)과 편심질량(

) 각각의 위치

는 직각을 이룬다.Figure 2b is a schematic diagram showing the revolution and rotational motion of the rotating body 100, when the rotational speed of the rotating shaft is similar to the natural frequency described above. As shown, the center of rotation (

,

) The center of revolution (c) and the eccentric mass (

) Each position

Is at right angles.

,

) 각각을 기준으로 공전중심(c)과 편심질량(

)의 위치

각각이 동일한 방향에 위치된다.Figure 2c is a schematic diagram showing the revolution and rotation of the rotating body 100, when the rotational speed of the rotating shaft is larger than the natural frequency described above. Normal rotational speed of the normal rotating body 100 corresponds to this, the center of rotation (

,

) The center of revolution (c) and the eccentric mass (

Location of)

Each is located in the same direction.

As described above, the self-compensating balancer according to the present invention can suppress the eccentricity of the rotating body 100 by using the relation between the center of revolution and the eccentric mass of the rotating body 100, as described with reference to FIG. 2C. Similarly, the rotation speed of the rotating body 100 is effective above the natural frequency.

As shown in FIG. 3, the self-compensating balancer 200 according to the embodiment of the present invention has an annular body 210 having an inlet-shaped race 215 and a movable member placed inside the body 210. 300 and a cover member 220 coupled to the body 210 to cover the race 215 is configured. The central portion of the body 210 is preferably a hollow (210a) is formed so that it can be installed on the rotating body. Coupling of the cover member 220 and the body 210 is possible by using an adhesive, grooves and protrusions or screws formed at positions corresponding to each other. Since the coupling method between the two members is widely known, a detailed description thereof will be omitted.

The opening of the body 210 may be formed over the upper front surface of the lace 215, as shown, and formed to a size to accommodate the movable member 300 in a portion of the upper portion of the lace 215. It may be.

The movable member 300 includes a plurality of rigid bodies and / or fluids that can be directed in a radial direction opposite to the center thereof by the centrifugal force when the body 210 rotates.

3 illustrates an example in which the movable member 300 includes a plurality of rigid bodies 310 inside the race 215. The rigid body 310 is installed to roll or slide freely so that its position can be determined by the centrifugal force during rotation.

4 to 7 each show a shape according to embodiments of the rigid body located inside the race 215 described above. 4 illustrates a case in which the rigid body 310 has a spherical shape 311. 5 illustrates a case in which the rigid body 310 has a cylindrical shape 312. In this case, the rigid body 310 can be rolled in contact with its outer circumferential surface in contact with the inner outer wall surface of the race 215. 6 illustrates a case in which the rigid body 310 has a truncated cone shape 313, and the outer circumferential surface thereof is disposed to be in contact with the inner bottom surface of the race 215. In addition, FIG. 7 illustrates that the rigid body 310 is slidably contacted with the inner bottom surface or the outer wall surface of the race 215 in a fan-shaped columnar shape 314.

As shown, in employing a rigid body 310 as the movable member 300, the rigid body 310 has a shape, as described with reference to Figures 4 to 7, preferably, the race 215 ) It can be transformed into other shape within the range that can move freely inside.

As shown in FIG. 8, the movable member 300 may further include a fluid 320 together with the rigid body 310. Unlike the rigid body 310, the fluid 320 has a large contact area with the race 215 and the cover member 220 of the body 210, and there is a significant difference in viscosity. When employed inside the race 215, the internal excitation force due to the eccentric mass of the rotating body can be more effectively compensated.

Here, the rigid body 310 is preferably made of a nonmagnetic material so as not to be affected by the magnetic force of the magnet (s) employed in the rotating body.

), 질코니아(

), 오스테 나이트계열 스텐레스(YHD50), 스텐레스 계열인 SUS300, SUS304, SUS316등의 비자성체 금속이나, 세라믹, 합성수지등의 재질로 구성된다.That is, the rigid body 310 is made of tungsten carbide (WC), berririum steel (CuBe), Hastelloy C (276), silicon nitride (

), Zilconia (

), Austenitic stainless steel (YHD50), stainless steel such as SUS300, SUS304, SUS316, and non-magnetic metals, ceramics, and synthetic resins.

As described above, when the rigid body 310 is made of a non-magnetic material, since the rigid body 310 is not affected by the magnet, the rigid body 310 is smoothly moved, and thus the rotation of the body 300 and the eccentric mass position of the rotating body are performed. It depends on it.

In addition, the rigid body 310 is preferably made of a non-oxidizing material or coated with an anti-oxidation in order to exclude the unnatural movement of the rolling or sliding inside the race by corrosion, that is, oxidation.

To this end, the rigid body 310 may be made of a non-oxidizing material, such as SUS300, ceramic, synthetic resin. In addition, the outer surface of the rigid body 310 is formed by the oxidation treatment by zinc, nickel chromium plating, etc., based on carbon steel, chromium steel and the like.

In addition, the rigid body 310 may be made of a material that does not affect the movement of the rigid body because the particles of the oxide oxidized in the air.

As shown in FIG. 9, only the fluid 320 may be employed as the movable member 300 without employing the rigid body. In this case, the cover member 220 seals the race 215 so that the fluid 320 does not flow out.

10 to 12 will be described according to the embodiment of the body and the cover member described above.

As shown in FIG. 10, the body 210 and the cover member 220 have a rectangular shape 216 having an inner cross section of the lace 215 cut through the center of rotation of the portion where the movable member 300 is installed. Is preferred. In addition, as shown in FIG. 11, the body 210 and the cover member 220 have an elliptical shape 217 having an internal cross section cut across the center of rotation of the portion where the movable member 300 is installed. . In addition, as shown in Figure 12, the race 215 and the cover member 220 is a shape in which a portion of the inner cross-section cut across the center of rotation of the portion where the movable member 300 is installed is curved inside. Has 218. This case is suitable when the rigid body 310 is employed as the movable member 300, and is very useful for minimizing the contact portion between the rigid body 310 and the body 210.

), 질코니아(

), 황동, 알루미늄, 오스테 나이트계열 스텐레스(YHD50), 스텐레스 계열인 SUS300, SUS304, SUS316등의 비자성체 금속이나, 세라믹, 합성수지등의 재질로 구성될 수 있다.Body 210 including the lace 215 and the cover member 220 is preferably made of a non-magnetic material in order to exclude the influence of the magnetic force between the rigid body 310 and. That is, the body 210 and the cover member 220 are made of tungsten carbide (WC), berririum steel (CuBe), Hasterloy C (276), silicon nitride (

), Zilconia (

), Brass, aluminum, austenitic stainless steel (YHD50), stainless steel series of non-magnetic metals such as SUS300, SUS304, SUS316, ceramics, synthetic resins, and the like can be composed of.

In addition, the body 210 is preferably composed of a non-oxidizing material or coated with an antioxidant. The non-oxidizing material includes SUS300, ceramics, synthetic resins, and the like. In addition, the anti-oxidation coating is formed by an anti-oxidation treatment using zinc, nickel chromium plating, or the like based on carbon steel, chromium steel, or the like.

13 is a schematic cross-sectional view showing a self-compensating balancer 200 according to another embodiment of the present invention. As shown, the self-compensating balancer 200 includes a body 210, first and second races 215a and 215b formed in the body 210, and the first and second races 215a. Cover member 220 to cover 215b, and movable members 300a and 300b placed inside each of the two races 215a and 215b. A hollow 210a is formed at the center of the body 210 so as to be installed on a rotating body (not shown), and the center of rotation of the first and second races 215a and 215b is the center of rotation of the rotating body. Is located in. The movable members 300a and 300b may include not only a rigid body as shown but also a fluid as described with reference to FIG. 9, and the shape and material thereof may be substantially as described above with reference to FIGS. 4 to 9. Since the same or similar, detailed description thereof will be omitted.

Shapes of the two races 215a and 215b are the same as those described with reference to FIGS. 10 to 12, and thus, detailed description thereof will be omitted.

As described above, two races 215a and 215b having coaxial are formed, and movable members 300a and 300b which operate independently in respective races 215a and 215b are respectively provided in the rotating body. When adopted, internal vibration caused by the eccentric mass of the rotating body can be more effectively suppressed.

In the present embodiment, two races have been described as an example, but may include two or more races. In addition, neighboring races may be connected to each other.

Hereinafter, the vibration reduction effect during the operation of the rotating body employing the self-compensating balancer according to the present invention with reference to FIG.

,

)을 기준으로 회전체(100)의 편심질량(

)의 위치(

,

)와, 레이스, 가동부재 및 커버부재를 포함하는 자기보상형 밸런서(200)의 무게 중심 즉, 보상질량(

)의 위치(

,

)가 회전축을 기준으로 할때 상기 공진중심(c)과 반대되는 쪽에 위치된다. 따라서, 회전축의 공진반경이 커지게 된다.When the rotational speed of the rotating body is less than or equal to the natural frequency, as shown in Fig. 14A, the position of the rotating shaft (

,

Eccentric mass of the rotating body (100)

) Location (

,

), The center of gravity of the self-compensating balancer 200 including the race, the movable member and the cover member, that is, the compensation mass (

) Location (

,

) Is located on the side opposite to the resonance center (c) when the rotation axis is referred to. Therefore, the resonance radius of the rotating shaft is increased.

) 위치(

,

)가 동일한 쪽에 위치하고, 상기 보상질량(

)의 위치(

,

)가 원심력에 의해 반대쪽에 위치한다. 따라서, 편심질량(

)에 의한 불평형이 상쇄되어 상기 회전축의 공진반경이 대폭 줄어들게 되고, 회전체(100)의 편심질량(

)에 의한 내부 가진력이 완화된다.On the other hand, when the number of revolutions of the rotor 100 is significantly greater than the natural frequency, substantially the rotor 100 is rotated at the normal speed, as shown in Figure 14b, when the reference to the rotation axis, the resonance Eccentric mass of center (c) and rotor 100 (

) location(

,

) Is on the same side, and the compensation mass (

) Location (

,

) Is located on the opposite side by centrifugal force. Therefore, the eccentric mass (

), The unbalance due to) cancels the resonance radius of the rotating shaft significantly, and the eccentric mass (

) Internal excitation force is alleviated.

As described above, the self-compensating balancer according to the present invention configured is employed in the rotating body so that its center coincides with the center of the rotating body, so that the eccentric mass of the rotating body can be compensated without removing the influence of magnetic force or the like.

Hereinafter, embodiments of a disc player employing the self-compensating balancer 200 of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 15, the disc player includes a deck base 410, a deck plate 430 elastically coupled to the deck base 410, and a buffer disposed between the deck base 410 and the deck plate 430. The disc 1 placed on the turntable 450 facing the member 420, the spindle motor 460 installed on the deck plate 430, the turntable 450, the optical pick-up 435, and the turntable 450. And a self-compensating balancer 200 configured to hold the clamper 440 and a revolving shaft 465 of the spindle motor 460 due to the eccentric mass of the disk 1. do.

The deck plate 430 is weakly impacted from the deck base 410 by the buffer member 420. To this end, the buffer member 420 is preferably made of a material having a weak rigidity, for example, soft rubber or polyurethane so as to alleviate external vibration transmitted from the deck base 410. In order to realize a thin and short, the deck plate 430 is preferably to reduce the mass. The spindle motor 460 provides a rotational force for rotating the disk (1). The spindle motor 460 includes a stator, a rotor and a rotating shaft 465, the rotor being installed outside the stator. The turntable 450 has its center fixed on the rotation axis 465 of the spindle motor 460 and the disk 1 is placed on its upper surface during operation. The clamper 440 prevents the flow of the disk 1 placed on the turntable 450 facing the turntable 450. The turntable 450 is fixed on the rotation shaft 465 to be rotated by the rotation of the spindle motor 460, and thus the disk 1 and the clamper 440 also rotate together.

As described with reference to FIG. 3, the self-compensated balancer 200 includes an annular body 210 having an inset race 215, a movable member 300 placed inside the race 215, and It is configured to include a cover member 220 coupled to the body 210 to cover the race 215. Coupling of the cover member 220 and the body 210 is possible by using an adhesive, grooves and protrusions or screws formed at positions corresponding to each other. Since the combination of the two members is widely known, a detailed description thereof will be omitted. As shown in the drawing, the opening may be formed over the entire upper surface of the lace 215, and may be formed to have a size that allows the movable member 300 to be injected into a portion of the upper portion of the lace 215.

The movable member 300 includes a plurality of rigid bodies 310 and / or fluids 320 which can be directed in a radial direction opposite to the center thereof by the centrifugal force when the body 210 rotates.

Various embodiments of the movable member 300 and the lace 215 are as described with reference to FIGS. 3 to 13, and thus detailed description thereof will be omitted.

Disc player according to an embodiment of the present invention, as described above, the self-compensating balancer 200 configured as at least one of the rotating member of the disc player, that is, the spindle motor 460, turntable 450, clamper 440. The feature is that it is provided in the member.

16 is a cross-sectional view illustrating a structure in which the self-compensated balancer 200 is coupled to the turntable 450.

As shown, the mounting member 451 of the turntable 450 is rotatably coupled to the rotation shaft 465 of the spindle motor 460. To this end, a coupling hole 451a is inserted into and fixed to the rotation shaft 465 at the center of the seating member 451. On the upper surface of the seating member 451, a coupling protrusion 453 is formed to protrude so that the center hole of the disk (1 in FIG. 15) can be fitted therein. The center of the coupling protrusion 453 coincides with the center of the coupling hole 451a. In addition, the turntable 450 further includes a magnet 455 to fix the disk (1 of FIG. 15) on the seating member 451 by mutual magnetic force with the clamper (440 of FIG. 15). desirable. The magnet 455 is fitted into an installation groove 453a formed around the coupling hole 451a inside the coupling protrusion 453.

The self-compensating balancer 200 has a body 210 coupled to the outer circumference of the seating member 451. That is, the hollow 210a formed inside the body 210 may be installed by fitting to the outside of the seating member 451. Here, the coupling between the seating member 451 and the hollow 210a of the body 210 is possible by conventional fastening means such as adhesion using an adhesive material, interference fitting through press-fitting, screwing, and the like. In addition, the shape of the outer circumferential surface of the hollow and the mounting member 451 corresponding thereto may be not only circular but also spline and polygonal.

An embodiment of a self-compensating balancer coupled spindle motor according to the present invention will be described in detail with reference to FIGS. 17 and 18.

Spindle motor 460 according to the present invention, as shown in Figure 15, is coupled to the deck plate 430, and rotates the turntable 450 coupled on the rotary shaft 465.

The spindle motor 460 includes a motor base 461, a rotating shaft 465, a stator 462, a rotor 470, and bearings 469a and 469b.

The motor base 461 is coupled to the deck plate (430 of FIG. 15) and has a through hole 461 a therein, and the rotating shaft 465 and the bearings 469 a and 469 b therein. Combined.

The stator 462 is fixedly installed on a lower surface of the motor base 461, and includes a yoke 463 facing the rotor 470, and a coil part 464 located inside the yoke 463. ). The bearings 469a and 469b are positioned between the through hole 461a and the rotation shaft 465 to support the rotation shaft 465 in the radial and axial directions. To this end, the bearings 469a and 469b are provided in pairs and are positioned inside the through hole 461a while being spaced apart from the predetermined interval. That is, the first bearing 469a has its inner ring fixed to the rotating shaft 465 and its outer ring fixed to the through hole 461a to catch the axial and radial flow of the rotating shaft 465. The second bearing 469b is slidably fitted in the through hole 461a to hold the rotation shaft 465 inclined. An elastic member 468 is positioned inside the through hole 461a between the first bearing 469a and the second bearing 469b to rotate the rotor 470 that is transmitted to the motor base 461. Reduce vibration. The bearings (469a) and (469b) preferably employ metal bearings in consideration of positional accuracy during high speed rotation, and other types of bearings such as ball bearings or pneumatic bearings may be employed.

The rotor 470 is fixed to one end of the rotating shaft 465 and is installed to surround the stator 462 and a magnet fixed in the case 471 to face the yoke 463. (447). Here, a fixing member 473 is further provided at a coupling portion between the case 471 and the rotation shaft 465 to prevent the rotation shaft 465 from falling out or emptying with respect to the case 471.

The self-compensation balancer 200 described with reference to FIGS. 3 to 13 is coupled to the outer circumference of the case 471. That is, the hollow 210a formed inside the body 210 of the self-compensating balancer 200 may be installed by fitting the outside of the case 471. Here, the coupling between the case 471 and the body 210 is possible by conventional fastening means such as bonding, press-fitting, screwing using an adhesive material, and a detailed description thereof will be omitted.

In addition, as shown in FIG. 18, the self-compensating balancer 200 may be coupled to the rotating shaft 465. In this case, a hollow 210a having a diameter corresponding to the diameter of the rotating shaft 465 is formed in the body 210 of the self-compensating balancer 200, and through the hollow 210a in the rotating shaft 465. To combine. Coupling between the body 210 and the rotating shaft 465 is possible by forming an interference fit or a spline of a corresponding shape.

A clamper combined with a self-compensating balancer according to the present invention will be described with reference to FIGS. 19 and 20.

As shown in FIG. 15, the clamper 440 is installed on the turntable 450 by a bracket (not shown) coupled with the deck base 410 to be seated on the turntable 450. Hold it. 19 and 20, the clamper 440 of the present invention includes a clamper body 445 and a pressurizing means 446. The pressing means 446 is installed on the clamper body 445 to press the disk (1) seated on the turntable (450 in Fig. 15).

As shown in FIG. 19, the pressing means 446 may be a yoke member 447 coupled to an inner lower portion of the clamper body 445. The yoke member 447 presses the disk (1 in FIG. 15) by mutual magnetic force with the magnet (455 in FIG. 16) positioned on the turntable (450 in FIG. 15).

In addition, the pressing means 446 may be configured to include a pressing plate 448 and the elastic member 449, as shown in FIG. The pressure plate 448 is installed on the lower surface of the clamper main body 445 so as to be lifted and lowered. The elastic member 449 is disposed between the clamper body 445 and the pressure plate 448 to allow the pressure plate 448 to elastically press the disk (1 in FIG. 15).

Accordingly, when the turntable 450 and the clamper body 445 are fixed relative to each other, for example, the clamper body 445 is fixed and the turntable 450 is lifted up so that the turntable 450 and the clamper body 445 are adjacent to each other. Then, the pressing means 446 to hold the disk 1 placed on the turntable 450. Accordingly, the clamper body 445 also rotates in conjunction with the rotational movement of the turntable 450.

The self-compensating balancer 200 is fitted to the outside of the clamper body 445 is installed. That is, the hollow 210a formed inside the body 210 of the self-compensating balancer 200 can be installed by fitting the outside of the clamper body 445. Here, the coupling between the clamper body 445 and the body 210 is possible by conventional fastening means such as bonding, press-fitting, screwing using an adhesive material.

As described above, the self-compensating balancer and the disc player employing the self-compensating balancer according to the present invention are provided by generating a force from the revolving center of the rotating body to the outside by the centrifugal force within the race of the body. By compensating for the internal vibration generated by the eccentric mass of the rotating body, the internal vibration of the rotating body can be effectively suppressed. In addition, since the self-compensating balancer is detachable, there is an advantage in that it is easy to install the rotating body and the disc player in use.

The disc player employing the self-compensating balancer adopts a weak stiffness damping member to suppress external vibration, and the self-compensating balancer can be any one of a turntable, a spindle motor case, a rotating shaft and a clamper of the spindle motor. By providing the member, the internal vibration generated by the eccentric mass of the disk can be compensated to effectively suppress the internal vibration generated during the rotation of the disk.

Therefore, the disc player according to the present invention is suitable as a high speed CD or CD-ROM drive of 6 times or more.

Although the present invention has been described with reference to the embodiments illustrated in the accompanying drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible. .

Claims (23)

An annular body having an introduced race and coupled to a rotation center of the rotating body; A movable member movably installed in the race and including a plurality of rigid bodies made of non-oxidized material so as not to corrode; A cover member coupled to the body to cover the opening of the race; And the body is installed on the rotating body to compensate for the eccentric mass of the rotating body when rotating. The self-compensating balancer of claim 1, wherein the rigid body has one shape selected from a sphere shape, a cylinder shape, a truncated cone shape, and a fan shape columnar shape. The self-compensating balancer of claim 1, wherein the rigid body is made of one material selected from the group consisting of SUS300, ceramic, and synthetic resin. The self-compensating balancer as claimed in claim 1, wherein the outer surface of the rigid body is coated with an anti-oxidation coating. The self-compensating balancer according to claim 4, wherein the anti-oxidation coating is formed by an oxidation treatment of zinc, nickel chromium plating, or the like based on carbon steel or chromium steel. According to claim 1, wherein the lace and the cover member has an inner cross section cut across the center of rotation of the portion in which the movable member is installed in a rectangular shape, an elliptical shape with a long axis formed in the radial direction of the race and a part of each side. Self-compensating balancer characterized in that it has one shape selected from among the shape curved inside. The self-compensating balancer of claim 1, wherein the body and the cover member are made of non-oxidizing material so as not to corrode. The self-compensating balancer according to claim 7, wherein the body and the cover member are made of one material selected from the group consisting of SUS300, ceramic, and synthetic resin. A deck base, a deck plate elastically coupled to the deck base, a cushioning member disposed between the deck base and the deck plate so as to protect the deck plate from external impact, and a rotational force installed on the deck plate and mounted on the disc. And a spindle motor for providing a turntable, a turntable on which the disk is placed, the clamper for holding the disk on the turntable, and a radially transferable disk on the deck plate. A disc player comprising an optical pickup for recording and / or playing back information on a disc, A body having an annular lace formed therein and coupled to at least one of a rotor of the spindle motor, a rotation shaft of the spindle motor, the turntable and the clamper; A movable member placed inside the race such that the center of gravity of the spindle motor is opposed to the center of gravity of the disk by the centrifugal force when the disk is rotated; And a cover member covering the opening of the race. 10. The disk player according to claim 9, wherein the movable member includes a plurality of rigid bodies having one shape selected from a sphere shape, a cylinder shape, a truncated cone shape, and a fan shape columnar shape. 11. The disc player as set forth in claim 10, wherein the race is further provided with a fluid injected therein. The disc player according to claim 10, wherein the rigid body is made of a nonmagnetic material so as not to be affected by magnetic force. The method of claim 12, wherein the rigid body is made of tungsten carbide (WC), berririum steel (CuBe), HASTELLOY C-276, silicon nitride (

), Zilconia (

), Austenitic stainless steel (YHD50), stainless steel series SUS300, SUS304, a non-magnetic metal group of SUS316, and a disc player, characterized in that composed of a material selected from the group consisting of ceramic, synthetic resin. The disc player according to claim 10, wherein the rigid body is made of a non-oxidizing material so as not to corrode. 15. The disc player according to claim 14, wherein the rigid body is made of one material selected from the group consisting of SUS300, ceramic, and synthetic resin. 15. The disc player as set forth in claim 14, wherein the outer surface of the rigid body is coated with an antioxidant. The disc player according to claim 16, wherein the anti-oxidation coating is formed by oxidation treatment by zinc, nickel chromium plating, or the like based on carbon steel, chromium steel, or the like. 10. The disc player as set forth in claim 9, wherein said movable member is fluid fluidly injected into said race. 10. The method of claim 9, wherein the lace and the cover member has an inner cross section cut across the center of rotation of the portion in which the movable member is installed, and has a rectangular shape, an elliptical shape having a long axis in the radial direction of the lace, and a part of each side. The disc player characterized in that it has one shape selected from among the shape curved inside. 10. The disc player according to claim 9, wherein the body and the cover member are made of a nonmagnetic material so as not to be affected by a magnetic force. 21. The method of claim 20, wherein the body and the cover member is made of tungsten carbide (WC), berririum steel (CuBe), Hastelloy C (276), silicon nitride (

), Zilconia (

), A brass, aluminum, austenitic stainless steel (YHD50), stainless steel series of SUS300, SUS304, non-magnetic metal group of SUS316, and a disc player comprising a material selected from the group consisting of ceramic, synthetic resin. The disc player according to claim 9, wherein the body and the cover member are made of non-oxidizing material so as not to corrode. 23. The disc player as set forth in claim 22, wherein the body and the cover member are made of one material selected from the group consisting of SUS300, ceramic, and synthetic resin.

Images