KR100587846B1 - Automatic Centering Apparatus Of Disc - Google Patents

Abstract

The present invention relates to an optical disk self-aligning device capable of suppressing vibrations when rotating a disk.

The optical disk self-aligning device of the present invention is characterized by including an annular member coupled to the outer edge of the optical disk, and an unbalance correcting member inserted into the annular member for correcting the unbalance during rotation of the optical disk.

According to the present invention, the annular member into which the ball (or fluid) for self-alignment is inserted is coupled to the outer edge of the disc and the eccentric mass of the optical disc is canceled by the movement of the ball (or fluid) during the rotation of the optical disc. Unbalance vibration due to eccentric mass can be suppressed.

Description

Disk Centering Apparatus {Automatic Centering Apparatus Of Disc}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a disc-shaped recording medium (hereinafter referred to as a disc) in which various kinds of information are stored, and more particularly, to a disc self-aligning device suitable for high speed rotational driving.

BACKGROUND OF THE INVENTION Optical discs, which have been generalized due to the spread of compact discs (CDs) as information recording media, are expected to become more popular as large-capacity DVDs (Digital Versatile Discs) and recordable optical discs are spreading. Recordable optical discs can be roughly divided into phase-change type discs and magneto-optical discs such as DVD-Read Access Memory (DVD-RAM). The phase change type optical disc uses a method in which information is recorded as the coupling structure of the recording surface is changed by a light beam. The magneto-optical disc records information through magnetic field modulation using a magnetic head and uses a light beam. The information is reproduced by detecting a change in polarization angle according to the photo-magnetic conversion characteristic.

Such optical discs have to be rotated at high speed because they are becoming high speed so that a lot of information can be transmitted at high speed, that is, high-speed recording and reproducing of information as they are densified and high in order to increase storage capacity.

However, the disk inevitably causes vibration due to the influence of the eccentricity of the disk due to the assembly tolerance of the driver during rotation and the air resistance due to the air flow generated during the rotation of the disk. Due to the vibration of the disk, the recording / reproducing operation of the disk driver is unstable, leading to a problem that information cannot be recorded or reproduced correctly. In particular, the unbalance vibration caused by the eccentricity of the disc causes the vibration of the disc. This unbalanced vibration is the most important problem because the rotation speed of the optical disk increases as the speed increases.

Accordingly, it is an object of the present invention to provide a disk self-aligning device capable of suppressing the occurrence of vibration during the rotation of the disk.

Another object of the present invention is to provide a disc tray including a disc self-aligning device capable of suppressing vibration generation during disc rotation.

In order to achieve the above object, the optical disk self-aligning device according to the present invention is characterized by having an annular member coupled to the outer edge of the optical disk, and an unbalance correcting member inserted into the annular member for unbalance correction during rotation of the optical disk.

The unbalance correction member is characterized in that the ball.

The unbalance correcting member is characterized in that the fluid.

Disc tray according to the present invention is characterized in that it comprises an annular member coupled to the outer edge of the optical disk and inserted into the unbalance correction member for unbalance correction during rotation of the optical disk.

The disc tray may further include a locking member formed on a side wall of the annular member so that the annular member can be held on a seating surface on which the optical disk is mounted.

The optical disk is characterized in that coupled to the removable member and the annular member.

Other objects and advantages of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4.

FIG. 1 is a plan view illustrating an apparatus for automatically aligning an optical disk according to an exemplary embodiment of the present invention, wherein the apparatus for aligning an optical disk of FIG. 1 includes an annular member 14 coupled to an outer edge of the disk disc 12 and a disk 10. A plurality of balls 16 inserted into the annular member 14 for self-care during rotation.

In the annular member 14 coupled to the outer periphery of the disc disc 12 in the disc 10 shown in FIG. 1, a plurality of balls 16 for self-alignment when the disc 10 rotates are inserted to be movable. do. These balls 16 exhibit a phase in which the mass of the balls 16 is opposite to the eccentric mass of the disk 10, i.e., 180 °, when the frequency generated by the high speed rotation of the disk 10 exceeds the natural frequency. The disk 10 is moved to offset the eccentric mass of the disk 10 so as to balance the disk 10.

Referring to FIG. 2, the phase shift of the balls 16 according to the rotational angular velocity ω of the disk 10 is shown. When the rotational angular velocity ω of the disk 10 is smaller than the natural frequency ω _n , the disk 10 The eccentric mass Me and the ball 16 are located in phase. In addition, when the rotational speed of the disk 10 increases so that the centrifugal force by the ball 16 acts and the rotational angular velocity ω of the disk 10 becomes equal to the natural frequency ω _{n of} the disk 10. The eccentric mass Me and the ball 16 are positioned to have a phase difference of 90 degrees. Furthermore, when the rotational speed of the disk 10 is further increased so that the rotational angular velocity ω of the disk 10 exceeds the natural frequency ω _n , the eccentric mass Me and the ball 16 of the disk are 180 °. Positioned so as to have a phase difference, the eccentric mass of the disk 10 is canceled by the mass of the ball 16. As a result, when the disc 10 rotates, the disc 10 is automatically calibrated to suppress the unbalance vibration caused by the eccentric mass of the disc.

In addition, the same effect can be expected even if the annular member 14 is filled with a flowable fluid instead of the ball 16. For convenience in coupling the annular member 14 and the disc disk 12, the annular member 14 may be manufactured to have a cross-section having an 'L' shape.

3 is a perspective view showing the optical disk self-aligning device according to another embodiment of the present invention, the self-aligning device of Figure 3 is an annular member 26 mounted on the tray 20, and the automatic watch when rotating the optical disk 24 It has a plurality of balls 28 inserted into the annular member 26 for the purpose.

In FIG. 3, the tray 20 is used to transfer the mounted optical disk 24 to the access position, and accesses the seating surface 21 on which the optical disk 24 and the annular member 26 are seated, and the optical disk 24. An opening 23 is formed to secure a space for the optical pickup for accessing the optical disk 24. In addition, the tray 20 is provided with a locking rib 22 protruding from the side wall portion so that the annular member 26 is maintained in the seated surface 21 of the tray 20. In the annular member 26, a ball 28 or a fluid for self-aligning when the optical disk 24 is rotated is inserted in a flowable manner. The optical disc 24 is coupled to the annular member 26 in a detachable state. To this end, the annular member 26 is provided with a projection 25 having an elastic force in the side wall portion to which the optical disk 24 is coupled, as shown in Figure 4 so that the optical disk 24 is detached by the elastic force of the projection 25 Make it possible.

The optical disk 24 is pressed into the annular member 26 seated on the tray 20 to rotate together with the annular member 26 by the driving force of the spindle motor. In this case, the eccentric mass of the optical disk 24 is canceled by the movement of the ball 28 or the fluid inserted into the annular member 26, so that the unbalanced vibration caused by the eccentric mass of the optical disk 24 can be suppressed.

As described above, according to the optical disk automatic monitoring device according to the present invention, the annular member into which the ball (or fluid) for self-alignment is inserted is coupled to the outer edge of the disk to be used for the movement of the ball (or fluid) when the optical disk is rotated. As a result, the eccentric mass of the optical disc is canceled, whereby unbalance vibration caused by the eccentric mass of the optical disc can be suppressed.

In other words, those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1 is a perspective view showing an optical disk employing a disk self-aligning device according to an embodiment of the present invention.

2 is a view showing the principle of the disk self-aligning device shown in FIG.

3 is a perspective view showing a tray employing a disk self-aligning device according to another embodiment of the present invention.

4 is a cross-sectional view taken along the line AA ′ of FIG. 3.

<Brief description of symbols for the main parts of the drawings>

10: optical disc 12, 24: disc disc

14, 26: annular member 16, 28: ball

20: tray 22: jam rib

21: seating surface 23: opening

25: protrusion

Claims (3)

And an annular member coupled to an outer edge of the optical disc and having an unbalance correction member inserted therein for the unbalance correction when the optical disc rotates. The method of claim 1, And a locking member formed on a side wall of the annular member so that the annular member can be held on a seating surface on which the optical disk is mounted. The method of claim 1, And the optical disk is coupled to the annular member to be detachable.