KR19980026494A - Disc player - Google Patents

Abstract

Disc players having a self-compensating balancer (automation balancer) capable of suppressing internal vibration due to eccentric mass of a disc are disclosed.

The disc player includes a deck base, a deck plate elastically coupled to the deck base, a cushioning member placed between the deck base and the deck plate to protect the deck plate from external shocks, and a disc plate mounted on the deck plate. A spindle motor that provides rotational force, a turntable on which the disk is placed on the axis of rotation of the spindle motor, a clamper that holds the disk on the turntable, and a disk that is radially transportable on the deck plate to provide information It includes an optical pickup for recording / reproducing, and is installed on at least one of the members rotated by the rotational force provided to the spindle motor, the center of gravity of the disk about the axis of rotation of the spindle motor by the centrifugal force during the rotation of the disk Further includes a self-compensating balancer positioned opposite the center of gravity It characterized in that the to inhibit the revolution of the spindle motor rotating shaft due to the eccentric mass of the disk group.

Description

Disc player

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc player, and more particularly, to a disc player having a self-compensation balancer capable of suppressing internal vibration due to an eccentric mass of a disc.

In general, a disc player is a device that records information on or plays back recorded discs such as compact discs (CDs), CD-ROMs, and digital video discs (DVDs). It protects discs and optical pickups from external shocks and internal vibrations. There is a need.

As shown in FIG. 1, a conventional 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 coupled to the rotation shaft 22 of the spindle motor 21 and on which the disk 1 is placed. 23 and a clamper 40 mounted on the upper inner surface of the housing to face the turntable 23 and clamping the disk 1 on the turntable 23 and the radial direction of the disk 1 on the deck plate 30. It is composed of an optical pickup (25) coupled to be transported to perform the recording / playback operation. The disc player is such that the external vibrations transmitted through the deck base 10 are not 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 is made of a weak material such as soft rubber or polyurethane, which is capable of absorbing external shocks well.

The disc player provided as described above can effectively protect the drive and optical pickup of the disc 1 from external impact. On the other hand, no measures have been taken to mitigate the internal vibration caused by the rotation of the spindle motor by the eccentric mass of the disk. Here, the disc eccentric mass is caused by a discrepancy between the center of gravity and the center of gravity of the disc due to an error in the manufacturing process of the disc, and causes the rotation axis of the spindle motor to rotate by whirling.

Therefore, in the 1x or 2x low speed model, the influence of the revolution of the spindle motor rotation is not a big problem, but in the 6x and 8x high speed models, the recording / reproducing of information becomes a big problem. have.

In view of this point, conventionally, the mass of the deck plate on which the spindle motor is installed is increased, or the rigidity of the shock absorbing member is increased, so that the deck plate is relaxed by the eccentric mass. When the mass of the deck plate is large, the effect thereof is not sufficient at high speed rotation, and when the rigidity of the shock absorbing member is increased, it does not effectively block external vibration or shock.

Accordingly, the present invention has been made in view of the above-described points, and provides a disc player which is capable of fundamentally suppressing internal vibration due to eccentric mass of a disc by using a self-compensating balancer as well as external vibration relaxation. The purpose is.

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

Figure 2 is a schematic exploded perspective view showing a disc player according to an embodiment of the present invention.

3A to 3C are schematic views showing the positional relationship between the eccentric mass position of the disk and the rotational axis with respect to the revolution center according to the rotational speed of the disk.

Figure 4 is a schematic perspective view showing a first embodiment of a self-compensating balancer according to the present invention.

Figure 5 is a schematic cross-sectional view showing a second embodiment of a self-compensating balancer according to the present invention.

Figure 6 is a schematic cross-sectional view showing a third embodiment of a self-compensating balancer according to the present invention.

Figure 7 is a schematic cross-sectional view showing a fourth embodiment of a self-compensating balancer according to the present invention.

Figure 8 is a schematic cross-sectional view showing a fifth embodiment of a self-compensating balancer according to the present invention.

9A is a schematic cross-sectional view showing a sixth embodiment of a self-compensating balancer according to the present invention;

9B is a plan view of FIG. 9A.

10A and 10B are schematic views showing the positional relationship between the eccentric mass position of the disc and the rotational axis with respect to the revolution center according to the rotational speed of the disc of the disc player having the self-compensation type balance according to the present invention;

Explanation of symbols for main parts of the drawings

1 ... disk 50 ... deck base

60 ... deck plate 61 ... spindle motor

62 Rotation axis 63 Turntable

65 Optical pickup 70 Shock absorbing member

80 ... clamper 90 ... self-compensating balancer

91,91a, 91b ... Tubes 92,92a, 92b ... Fluid

94,94a, 94b ... rigid 95 ... support plate

96 Pin Pin 97

In order to achieve the above object, the present invention provides a deck base, a deck plate elastically coupled to the deck base, a cushioning member disposed between the deck base and the deck plate to protect the deck plate from external impact and A spindle motor installed on the deck plate and providing a rotational force to the disk, a clamper for holding the disk on the rotating shaft of the spindle motor, and a disk motor installed on the deck plate to be transportable in a radial direction of the disk. A disc player comprising an optical pickup for recording / reproducing information, the disc player comprising: at least one of the members rotated by a rotational force provided to the spindle motor, the rotational axis of the spindle motor being driven by a centrifugal force during rotation of the disc. The center of gravity of the disk is opposite the center of gravity of the disk. And further comprising a magnetic balancer is compensated and the revolution of the spindle motor rotating shaft due to the eccentric mass of the disk to the said to be suppressed.

Hereinafter, embodiments of a disc player according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, a disc player according to the present invention includes a deck base 50, a deck plate 60 elastically coupled to the deck base 50, and the deck base 50 and a deck plate 60. As shown in FIG. ) Between the buffer member 70, the spindle motor 61 installed on the deck plate 60, the turntable 63 and the optical pickup 65, and the turntable 63 facing the turntable 63. Self-compensating balancer which can suppress the revolution of the rotation shaft 62 of the spindle motor 61 by the clamper 80 which hold | maintains the disk 1 which was put in it, and the eccentric mass of the disk 1; It comprises 90.

The deck base 50 is hinged so that one side is elevated in the housing (not shown). The deck plate 60 is weakly impacted from the outside of the deck base 50 by the buffer member 70. To this end, it is preferable to weaken the strength of the buffer member 70, and to reduce the mass of the deck plate 60. The spindle motor 61 provides a rotational force for rotating the disk (1). The turntable 63 is fixed at its center on the rotation axis 62 of the spindle motor 61 and the disc 1 is placed on its upper surface when the deck base 50 is loaded. The clamper 80 prevents the flow of the disk 1 placed on the spindle motor 61 facing the spindle motor 61. Here, the spindle motor 61 includes a stator (not shown) and a rotor (not shown) facing the stator and having the rotating shaft 62, and the rotor is rotated by an externally applied current. . The turntable 63 is fixed on the rotation shaft 62 and is rotated by the rotation of the rotor, so that the disk 1 and the clamp 80 also rotate together.

3A to 3C, the positional relationship between the eccentric mass position of the disk and the rotation axis with respect to the revolution center according to the rotational speed of the disk is as follows.

FIG. 3A is a schematic diagram showing the revolution and rotation of the disk when the rotational speed of the spindle motor rotational shaft 62 is less than or equal to the natural frequency of the deck plate 60. Here, the natural frequency is determined by the elastic modulus of the buffer member 70 and the mass of the members 61, 63, 65 installed on the deck plate 60 and the deck plate 60, the disk The frequency in the direction parallel to (1). As shown, the center of rotation of the disk 1 ( ) At a distance from The unbalanced mass of the disk ), If present, the center of rotation of the disc ( ) Is the origin of revolution (c) It is displaced into and makes an orbital movement. Rotation center The eccentric mass of the disc corresponding to each ) location Is displaced. At this time, the eccentric mass (c) and the disk (1) ) Each position Is the center of rotation of the disc (1) , ) Are placed opposite each other with respect to each other.

Figure 3b is a schematic diagram showing the revolution and rotation of the disk when the rotational speed of the spindle motor rotational axis is similar to the natural frequency of the deck plate. As shown, the center of rotation of the disk ( , ) The position of the eccentric mass of the center of revolution (c) and the disk (1) relative to each other Is at right angles.

Figure 3c is a schematic diagram showing the revolving and rotating motion of the disk when the rotational speed of the spindle motor rotation axis is greater than the natural frequency of the deck plate. The normal rotational speed of the disc capable of recording / playing information on the disc corresponds to this, and the center of rotation of the disc ( , ) The center of revolution (c) and the eccentric mass of the disc Each is located in the same direction.

The feature of the present invention is that the self-compensating balancer 90 described above is provided so as to suppress the eccentricity of the disc by utilizing the relationship between the center of revolution and the eccentric mass of the disc as described above.

The self-compensating balancer 90 is installed on at least one of a rotor (not shown), a rotating shaft 62, a turntable 63, and a clamp 80 that are rotated by the rotational force provided to the spindle motor 61. It is a member that changes its center of gravity by centrifugal force according to its rotation speed during rotation.

A first embodiment of a self-compensating balancer 90 according to the present invention will be described with reference to FIG. As shown, it is composed of an annular tube 91 and a fluid 92 flowably injected into the tube 91. The tube 91 is hermetically sealed and installed on a rotating member such as the rotor, the rotating shaft 61, the turntable 63, or the clamper 80. Here, the center of the tube 91 is located on the rotation shaft 61, preferably formed in a circular shape.

Therefore, the tube 91 is rotated by the rotational force provided by the spindle motor 61, and thus the fluid 92 is driven toward the outer circumference by the centrifugal force.

A second embodiment of a self-compensating balancer according to the present invention will be described with reference to FIG. As shown, it includes an annular tube 91 and at least one rigid body 94 movably positioned within the tube 91. The rigid body 94 is preferably in the form of a hollow sphere that is free to move in the tube or a cylindrical shape that can be rolled in the tube.

A third embodiment of a self-compensating balancer according to the present invention will be described with reference to FIG. As shown, it includes an annular tube 91, at least one rigid body 94 movably positioned within the tube 91, and a fluid 92 injected into the tube 91. In this case, the eccentric mass of the disk 1 due to the movement of the rigid body 94 The rotation of the rotating shaft 62 by the () is substantially suppressed, and the revolution of the rotating shaft 62 is finely suppressed by the fluid 92.

A fourth embodiment of the self-compensating balancer according to the present invention will be described with reference to FIG. As shown, at least one movably positioned inside each of the annular first and second tubes 91a and 91b disposed adjacent to each other and the first and second tubes 91a and 91b, respectively. One rigid body 94a, 94b. In addition, each of the tubes 91a and 91b may further include fluids 92a and 92b injected into the tube. In this case, each of the two tubes 91a and 91b serves as an independent balancer, so that the internal revolution of the rotation shaft 62 can be suppressed finely.

A fifth embodiment of the self-compensating balancer according to the present invention will be described with reference to FIG. As shown, first and second annular tubes 91a and 91b having different inner diameters and disposed adjacent to each other, and first rigid bodies and first injected into the respective tubes 91a and 91b, respectively. Two rigid bodies 94a and 94b. In this case, each of the first and second rigid bodies 94a and 94b includes at least one or more spheres or cylinders that can be rolled. The two bodies 94a and 94b have different volumes and masses. The first rigid body 94a positioned in the first tube 91a having a relatively large mass and a large volume compared to the second rigid body 94b is an eccentric mass of the disk 1. The rotation of the rotational shaft 62 by () is substantially suppressed, and the second rigid body 94b finely suppresses the rotation of the rotational shaft 62. At least one of the two tubes 91a and 91b is preferably injected with a fluid 94a and 94b.

The self-compensating balancer according to the fourth and fifth embodiments described with reference to FIGS. 7 and 8, respectively, is not limited to two tubes, but may be further provided.

A sixth embodiment of the self-compensating balancer according to the present invention will be described with reference to Figs. 9A and 9B. As shown, the support plate 95 is fixed to the rotation axis 62 of the spindle motor 61 in a direction perpendicular to the axial direction, and at least one rotating plate coupled in a direction parallel to the support plate 95 ( 97). Here, the support plate 95 is disposed side by side with each other is preferably provided with a pair so that the rotating plate 97 can be coupled therebetween, the rotating plate 97 is a support pin (96) by the support plate ( 95) pivotally coupled between.

The self-compensating balancer as described with reference to FIGS. 4 to 8 may be integrally formed with the turntable 63 or the clapper 80 in its positional relationship.

Hereinafter, the operation of the disc player according to the present invention will be described with reference to the drawings.

When the rotation speed of the disk 1 is less than or equal to the natural frequency, as shown in FIG. 10A, the position of the rotation shaft 62 ( , Eccentric mass of the disc (1) ) Location ( , ) And the center of gravity of the self-compensating balancer 90, that is, the compensation mass ( ) Location ( , ) Is located on the side opposite to the resonance center c when the rotation axis 62 is referred to. Therefore, the resonance diameter of the rotation shaft 62 becomes large.

On the other hand, when the number of revolutions of the disk is considerably greater than the natural frequency, when the disk is substantially rotated at the normal speed, as shown in FIG. 10B, the resonance center c and the resonance center are referred to. Eccentric Mass of Disk 1 ) location( , ) Is on the same side, and the compensation mass ( ) Location ( , ) Is located on the opposite side by centrifugal force. Therefore, the eccentric mass of the disk 1 ( ), The unbalance due to) cancels the resonant radius of the rotating shaft, and the eccentric mass of the disk 1 The internal excitation force of the deck plate 60 by) is relaxed.

As described above, the disc player according to the present invention is equipped with a self-compensating balancer on at least one of the members rotated by the spindle motor, so that even when a disc having a large eccentric mass is employed, internal vibration is effectively prevented. It can be suppressed. In addition, it is possible to effectively alleviate the external shock by employing a buffer member having a weak rigidity.

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 (14)

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 / reproducing information on a disc, It is installed on at least one of the members rotated by the rotational force provided to the spindle motor and the center of gravity of the center of the spindle motor is positioned opposite to the center of gravity of the disk by the centrifugal force during the rotation of the disk And a self-compensating balancer to suppress the revolution of the spindle motor rotational axis due to the eccentric mass of the disc. 2. The disc player as set forth in claim 1, wherein said self-compensating balancer comprises a tube and fluid fluidly injected into said tube. 2. A disc player according to claim 1, wherein the self-compensating balancer comprises an annular tube and at least one rigid body located in the tube. 4. A disc player according to claim 3, wherein the rigid body is a solid sphere. 4. A disc player according to claim 3, wherein the rigid body is cylindrical in shape to be rollable in the tube. 2. The disc player of claim 1 wherein the self-compensating balancer comprises an annular tube, at least one rigid body located within the tube, and a fluid injected into the tube. The disk player of claim 1, wherein the self-compensating balancer includes at least two annular tubes disposed adjacent to each other and at least one rigid body located in each of the tubes. 8. A disc player according to claim 7, wherein rigid bodies located in different tubes have different masses. The disc player according to claim 7 or 8, wherein a fluid is injected into at least one of the respective tubes. The disk player of claim 1, wherein the self-compensating balancer includes at least two tubes disposed adjacent to each other and a fluid injected into each tube. The disc player according to claim 10, wherein at least one of the tubes includes at least one rigid body that can be rolled therein. The disc player according to claim 1, wherein the self-compensating balancer includes a support plate fixed to a rotation shaft of the spindle motor, and at least one pivoting plate hinged in a direction parallel to the support plate. The disc player as set forth in claim 1, wherein the self-compensating balancer is integrally formed with the clamper. The disk player of claim 1, wherein the self-compensating balancer is integrally formed with the spindle motor.