KR100556738B1 - Optical disc - Google Patents

Abstract

The present invention is a conventional optical disk, the inner peripheral portion of the disk than the concave stacking ring formed by the projecting stacking ring protruding on the front and rear surfaces of the optical disk and the projecting stacking ring formed protruding on the surface of the optical disk By providing an optical disc, characterized in that formed close to, it reduces the generation and propagation of cracks occurring on the optical disc.

Optical Disc, Stacking Ring

Description

Optical Disc {OPTICAL DISK}

1 is a side view of an optical disc in which a conventional stacking ring is formed

Fig. 2 is a side view of an optical disc of a first embodiment of the present invention.

Fig. 3 is a side view of an optical disc of a second embodiment of the present invention.

Fig. 4 is a side view of an optical disc of a third embodiment of the present invention.

Fig. 5 is a side view of an optical disc of a fourth embodiment of the present invention.

Fig. 6 is a side view of an optical disc of a fifth embodiment of the present invention.

** Description of the symbols for the main parts of the drawings **

10: optical disc 11: inlet stacking ring

12: protrusion stacking ring 13: inner circumference

14: outer 15: clamping area

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc, and more particularly, to an optical disc with reduced generation and progress of cracks.

As an optical disc recording medium, a CD disc such as a CD-ROM, a DVD (Digital Versatile Disc / Digital Video Disc) or the like suitable for multimedia use has been developed.

Disc drives corresponding to these optical disc recording media irradiate laser light to a track of a disk which is rotated by a spindle motor from an optical pickup, and detect the reflected light to read data or to modulate the laser light by recording data. The data may be recorded by examining the data.

Such a disk drive has improved the system to increase the data processing speed to increase the rotational speed of the disk, the current speed of the disk drive has grown rapidly to more than 52 times. In this way, increasing the speed of the disc drive increases the probability that an error occurs during data recording / reproduction in the event of a defect in the disc. In particular, if a crack of more than a certain size is generated in the disk, rotating the disk at high speed may cause the disk to break, which may result in a fatal failure of the disk drive as well as a problem for the user's safety. .

In order to prevent such breakage, a method of forming a hole in a clamp area of a disc has been known. However, this method is scientifically meaningful but has not been practically applied due to various constraints.

On the other hand, on the optical disk, a stacking ring was formed between the clamping area of the disk and the recording surface to facilitate the separation of the disk.

1 is a side view of an optical disc in which a conventional stacking ring is formed.

As shown in the drawing, a conventional optical disk has a concave stacking ring 11 formed by being concave on one surface thereof, and a protruding stacking ring formed by protruding from a surface opposite to the surface on which the concave stacking ring 11 is formed. 12) is formed.

In addition, the concave stacking ring 11 is formed closer to the inner circumference 13 than the protruding stacking ring 12. The portion where the concave stacking ring 11 is formed is thinner than other portions of the disk 10, and thus structurally fragile. Therefore, there is a problem that the crack generated in the inner circumference 13 progresses toward the outer circumference 14 and reaches the concave stacking ring 11.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an optical disc that reduces the generation and progress of cracking of the disc by modifying the shape of the stacking ring.

The present invention provides an optical disc, characterized in that the projecting stacking ring is formed to protrude on the front and rear surfaces on the surface of the optical disc in order to achieve the object as described above.

In addition, the second embodiment of the present invention provides an optical disc, characterized in that the stacking ring protrudes on only one surface of the optical disc.

And as a third embodiment, the present invention provides an optical disk, characterized in that the protruding stacking ring formed to protrude on the surface of the optical disk is formed closer to the inner circumference of the disk than the concave stacking ring formed by concave.

In addition, as a fourth embodiment, the present invention provides an optical disc, wherein the protruding stacking ring and the concave stacking ring are formed on different surfaces.

Here, the protruding stacking ring is preferably formed to protrude throughout the clamp area.

As a fifth embodiment, the present invention provides an optical disc, wherein the projecting stacking ring is formed on only one surface of the clamp region.

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

However, in describing the present invention, a detailed description of known functions or configurations will be omitted in order not to disturb the gist of the present invention.

Fig. 2 is a side view of the optical disc of the first embodiment of the present invention.

As shown, the optical disk of the first embodiment of the present invention is formed with the protruding stacking ring 12 protruding on the front side and the rear side, and the concave stacking ring is not formed.

Fig. 3 is a side view of the optical disc in the second embodiment of the present invention.

As shown, the optical disk of the second embodiment of the present invention is formed by protruding stacking ring 12 protruding only on one surface, and no concave stacking ring is formed.

Fig. 4 is a side view of the optical disc in the third embodiment of the present invention.

As shown, the optical disk according to the third embodiment of the present invention is formed with a recess stacking ring (11) formed by being recessed on one surface, and protruded on the opposite side of the surface on which the recess stacking ring (11) is formed A protruding stacking ring 12 is formed.

In addition, the concave stacking ring 11 is formed farther from the inner circumference 13 than the protruding stacking ring 12.

Fig. 5 is a side view of an optical disc of a fourth embodiment of the present invention.

As shown, the optical disk according to the fourth embodiment of the present invention is formed by protruding stacking rings 12 protruding from the upper and lower surfaces of the disk 10, and the protruding stacking ring 12 is formed in the entire clamping area 15. Protrudes to form.

Fig. 6 is a side view of an optical disc of a fifth embodiment of the present invention.

As shown, the optical disk of the fifth embodiment of the present invention is formed by protruding stacking ring 12 protrudes on one surface of the disk 10, the concave stacking ring 11 or protruding stacking ring ( 12) is not formed. In addition, the protruding stacking ring 12 is formed to protrude throughout the clamping region 15 and is formed by increasing the height of the protruding stacking ring 12 as much as possible.

Hereinafter, the effects of the embodiments of the present invention will be described.

How effective the shape of the disk is in reducing crack formation and propagation can be seen by comparing the values of the crack driving force (J) for each shape.

Crack-induced load is defined as the measure of the energy release rate (G) available for crack propagation when cracks are present in the material. This value is known as J-integral value in nonlinear materials. Therefore, the large J integral value in nonlinear materials means that crack propagation is more easily performed in the material.

The J integral value can be obtained by finite element analysis for each shape, and in the case of the disc having the shape of the 3 mm thick stacking ring of the second embodiment, when the crack of 7.5 mm is present, it has the shape shown in FIG. The J integral value is reduced by 6% compared to the disk. In other words, the disk with the concave stacking ring 11 has a crack induced load that is 6% increased compared to the disk without the concave stacking ring 11.

The disc having only the protruding stacking ring 12 having a protruding 3 mm thickness as in the first embodiment has a J integral value reduced by 13% compared to the disc shown in FIG.

Further, as in the third embodiment, the protrusion stacking ring 12 formed closer to the inner circumference 13 than the recessed stacking ring 11 can reduce the progress of the crack than the disk shown in FIG. And, as in the fourth embodiment, when the width of the protruding stacking ring 12 is increased, it is possible to suppress the early generation propagation of the crack. It is also possible to slow the progress of the crack by increasing the height of the protruding stacking.

As described above, the disk of the embodiments of the present invention can suppress the occurrence and progress of the crack compared to the conventional disk by changing the shape of the stacking ring.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.

The present invention provides an optical disc that reduces the generation and progress of cracking of the disc by modifying the shape of the stacking ring.

Claims (5)

And a protruding stacking ring formed by protruding from the surface of the optical disk. The method of claim 1, And the protruding stacking ring and the concave stacking ring are formed on different surfaces. The optical disc of claim 1, wherein the protruding stacking ring protrudes from the entire clamp area. delete delete

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