KR100629056B1 - Turntable and optical disk device comprising the same - Google Patents

Abstract

The present invention relates to a turntable for an optical disk device, and more particularly, to a self-mounting turntable having a structure for mounting and supporting an optical disk using only a support of the turntable without using a separate friction member, and an optical disk device including the same. To this end, the present invention discloses a structure of a turntable and an optical disk apparatus including the same, wherein the surface roughness of the surface (disk mounting surface or contact surface) on which the optical disk is mounted is processed to substantially match the surface roughness of the optical disk. Through this, it is possible to increase the friction force between the optical disk and the turntable, and to provide a self-supporting and mounted turntable that does not require a separate friction member and an optical disk apparatus including the same.

Turntable, optical disc, friction member, surface roughness, disk mounting surface

Description

Turntable and optical disk device comprising same {Turntable and optical disk device comprising the same}

1 is a cross-sectional view showing an example of a conventional turntable;

2 is a perspective view showing another example of a conventional turntable;

3 is a perspective view showing a turntable according to an embodiment of the present invention;

4A is a cross-sectional view illustrating an example in which an optical disc is mounted on the turntable of FIG. 3;

4B is an enlarged cross-sectional view showing a corresponding portion of the turntable and the optical disc of FIG. 3;

5 is an exploded perspective view showing an optical disk;

FIG. 6 is a view showing the surface roughness of the optical disk in a three-dimensional shape; FIG. And

7 is a schematic perspective view showing an optical disk device according to another embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10, 110, 210, 310: turntable 20, 120, 220: support

30, 130, 230: fixing part 40, 140, 240: contact piece

50, 260: shaft portion 80: flat plate

82, 92, 102: center hole 86, 106: clamping area

88, 108: information recording surface 100: optical disc

104: inner peripheral surface 150: friction member

232: insertion hole 242: contact surface

262: coupling hole 300: optical disk device

320: turntable driving means 330: optical pickup

332: objective 350: base

352: opening 360: flexible connector

The present invention relates to a turntable for an optical disk device, and more particularly, to a self-mounting turntable having a structure for mounting and supporting an optical disk using only a support of the turntable without using a separate friction member, and an optical disk device including the same.

In general, in an optical disc device that records / reproduces an optical disc such as a compact disc (CD), a digital versatile disc (DVD), or a blu-ray disc (BD), a high density with an increase in the amount of information used. As a result, high-speed recording / reproducing and increasing mobility convenience for improving the spatio-temporal freedom of information demand are becoming a large part of the related industry.

A portable optical disc device that satisfies these functions should be able to prevent slippage or scattering of the optical disc even when the disc is rotated at high speed.In the case of mounting / removing the optical disc, the optical disc itself may be damaged or mounted / removed. In this case, it should not require excessive force, and industrially, it should be possible to reduce the light weight of component components. In order to satisfy these conditions, a structure of a self-supporting turntable having a structure in which an optical disk is mounted and supported by a turntable alone without using a separate clamp member has been developed.

U.S. Patent No. 5,799,006 by Sony Corporation describes a conventional turntable of a structure for supporting an optical disc using a leaf spring, an example of which is shown in cross section in FIG. According to FIG. 1, a conventional turntable 10 has a plurality of contact pieces 40 arranged at an equilateral angle in a fixing part 30 inserted corresponding to a center hole of an optical disc (not shown), thereby forming an optical disc and a turntable. It is characterized by the point of support while matching the center of rotation. Each of the conventional contact pieces 40 may be elastically supporting the inner circumferential surface of the optical disk when the optical disk is mounted by applying a leaf spring structure supported by the fixing portion 30, wherein the contact surface 42 is composed of a flat surface It is common.

In addition, the conventional turntable 10 further includes a shaft portion 50 coupled to the spindle motor 60 configured to rotate the turntable 10 at the lower portion of the support portion 20, and the drive shaft on the shaft portion 50. It is common that the coupling hole 52 into which the 62 is inserted and fixed is formed. The turntable 10 coupled with the spindle motor 60 may be applied to the optical disc device by being coupled to the base 70.

The conventional turntable 10 is efficient in terms of matching the center of the optical disk and the rotational center of the turntable, but it is insufficient to completely adhere the optical disk to the turntable. That is, although a plurality of conformal contacts 40 are equally and elastically support the inner circumferential surface of the center hole of the optical disc, the optical disc is closely supported by the turntable only because the contact area is made of point or line contact. There is a difficulty in becoming. For example, since the contact surface 42 of the contact piece 40 is constituted by a flat surface, only the line contact is made at both ends of the contact surface 42 with the inner circumferential surface of the central hole of the optical disk formed with curvature.

Thus, in addition to the configuration of FIG. 1, it is common to use a configuration such as using a separate clamp member (not shown) that is coupled to the fixing portion of the turntable over the turntable. As described above, in the case of the conventional turntable, the necessity of using a separate clamp member together with mounting and supporting of the optical disk alone is raised, which makes it difficult to achieve miniaturization and thinning of the optical disk apparatus using the turntable.

Next, FIG. 2 is a perspective view illustrating a turntable 110 according to another example of the related art. For example, in order to strongly adhere the optical disk to the turntable 110 without a separate member such as a clamp member, for example, the support part 120 of the turntable 110 may be formed. Disclosed is a structure of a turntable in which a friction member 150 such as rubber is laminated on a part of a surface (disk mounting surface) to a predetermined thickness t. Accordingly, the turntable 110 according to the related art is formed at fixed intervals 130 inserted into the center hole of the optical disc, and the contact piece 140 elastically supporting the inner circumferential surface of the optical disc at equal intervals. ), And a friction member 150 such as rubber is formed along the outer circumferential portion of the support part 120.

In order to construct such a conventional turntable, an additional process of forming a friction member such as rubber on the surface of the support of the turntable is required, and at the same time, the manufacturing cost is increased due to the application of the friction member. There is a problem that the product cost of the optical disk device increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a turntable having a structure capable of autonomously mounting an optical disc by a turntable alone without forming a separate friction member such as rubber.

Another object of the present invention is to provide an optical disk apparatus including a self-standing turntable.

In order to achieve the above objects, the present invention provides a turntable for mounting and continuously rotating an optical disk, comprising: a support of a circular flat plate for supporting a clamping area of the optical disk; A fixing part protruding upward from the center of the support part and inserted into the center hole of the optical disc; Is formed integrally at the bottom of the support portion, the shaft portion is inserted into the drive shaft for rotation of the turntable; And a plurality of contact pieces interposed on the inner circumferential surface of the center hole based on the fixing part and elastically deformed to contact and support the optical disc, wherein the surface roughness of the support part is formed within a predetermined range corresponding to the surface roughness of the optical disc. It provides a turntable.

In the present invention, the optical disk includes a flat plate on which an information recording surface on which information is actually recorded is formed on one side, and a protective layer laminated on the side on which the information recording surface is formed to form a surface, and the surface roughness of the optical disk is referred to as a protective layer. It characterized by the surface roughness of.

In the present invention, the support portion is formed with an annular disk mounting surface along the outer circumferential surface, and the surface roughness of the disk mounting surface is formed within a predetermined range corresponding to the surface roughness of the optical disk.

Further, in the present invention, the surface roughness of the plurality of contact pieces is characterized in that it is formed within a predetermined range corresponding to the surface roughness of the optical disk.

In addition, in the present invention, the predetermined range of the surface roughness is characterized in that the average roughness (Ra) of 20 to 100 nm.

In addition, the present invention includes a turntable according to claim 1; A drive shaft coupled to the shaft portion of the turntable, the turntable driving means rotating the turntable; An optical pickup that is reciprocally driven in a direction toward the turntable from one side of the turntable; Optical pickup driving means for reciprocating the optical pickup; And a base on which the turntable driving means and the optical pickup driving means are coupled and fixed.

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

3 is a perspective view illustrating a turntable according to an embodiment of the present invention, FIG. 4A is a cross-sectional view illustrating an example in which an optical disc is mounted on the turntable of FIG. 3, and FIG. 4B is a corresponding portion of the turntable and the optical disc of FIG. 3. Is an enlarged cross-sectional view illustrating the structure, and FIG. 5 is an exploded perspective view of the optical disk. The structure of a turntable according to a preferred embodiment of the present invention will be described with reference to these drawings.

As shown in these figures, the turntable 210 according to the present invention is for mounting and continuously rotating the optical disc 100, the support portion 220 of the circular plate for supporting the clamping region 106 of the optical disc; A fixing part 230 protruding upward from the center of the support part and inserted into the center hole 102 of the optical disc; A shaft portion 260 which is integrally formed at the bottom of the support portion and into which a driving shaft (not shown) is inserted to rotate the turntable; And a plurality of contact pieces 240 interposed on the inner circumferential surface 104 of the center hole with respect to the fixing part to elastically deform the contact part to support the optical disc, wherein the surface roughness of the support part 220 is a surface of the optical disc 100. It corresponds to roughness.

In the conventional case, a rubber-like friction member 150 (see FIG. 2) is formed on a portion of the support portion (for example, a disk mounting surface in which the lower surface of the disk is in direct contact with the outer peripheral surface thereof), thereby increasing the friction force between the optical disk and the support portion. In contrast, the present invention is characterized in that the friction force between the optical disk and the turntable is increased using only the support of the turntable without applying a friction member such as rubber.

To this end, the present invention is to increase the friction between the support and the lower surface of the optical disk by processing at least a portion of the surface including the disk mounting surface 222 of the support 220 substantially the same as the surface roughness of the optical disk in contact therewith To start.

As shown in Fig. 4, the surface roughness of the surface portion 222 (especially the disk mounting surface) of the support 220 is matched with the surface roughness of the optical disk so that the opposite curvatures are engaged with each other, thereby mounting the surface of the optical disk and the disk of the turntable. The friction between the faces can increase.

At this time, the fixing portion 230 of the turntable 210 is formed inside the contact piece 240 protruding outward through the insertion hole 232, the contact elastically supported by the elastic member 250, such as a spring The convenience contact surface 242 is in direct contact with the inner circumferential surface 104 of the optical disk to coincide with the center of the optical disk and the center of rotation of the turntable. In addition, the lower surface 106 of the optical disk 100 corresponds to the disk mounting surface 222 of the turntable. Is mounted. Rotation of the turntable 210 may be performed by rotation of a drive shaft (not shown) coupled through the coupling hole 262 of the shaft portion 260.

The clamping area 106 of the optical disc 100 is a portion mounted corresponding to the turntable, and an information recording surface 108 for recording / reproducing actual information is formed outside the clamping area 106.

More specifically, the lower surface of the optical disc refers to the surface roughness of the transparent substrate (protective layer) of the optical disc. That is, as shown in Fig. 5, the optical disc 100 has an information recording surface 88 on which information is actually recorded / reproduced, a clamping region 86 formed inside the information recording surface, and a center hole formed at the center of the clamping region ( Protection such as a transparent substrate 90 having a center hole 92 formed on a flat plate 90 composed of a flat plate 82 and a side surface of the flat plate to cover the information recording surface 86 and corresponding to the center hole 82 of the flat plate. It consists of a double structure of layers.

In this way, the optical disk, which is formed by stacking the flat plate and the protective layer, is mounted on the turntable with the protective layer facing downward, whereby the protective layer of the optical disk is in direct contact with the support of the turntable. Thus, the characteristics of the present invention can be achieved by substantially matching the surface roughness of the protective layer (transparent substrate) and the surface roughness of the support surface (at least part of the surface including the disk mounting surface) of the turntable.

Next, FIG. 6 is a diagram illustrating a surface roughness of an arbitrary optical disc in a three-dimensional shape. Optical discs mounted on the turntable may be classified into various conditions depending on whether new or used products are used or usage time and usage environment.In order to apply the features of the present invention to optical discs according to all of these conditions, all optical discs are referred to. The surface roughness must be defined in advance.

Applicants measured the surface roughness of each of the new optical discs just shipped from the factory and a number of used optical discs already in use, and the surface roughness of the optical discs was measured in the range of approximately 20 to 100 nm.

For reference, roughness (or roughness) refers to the curvature of the cross-sectional curve that is obtained by vertically cutting the finished surface.As the current Korean industrial standard, the average roughness of the center line defined in KS B0161 (Ra) ), Maximum height (Rmax), and 10-point average roughness (Rz) can be used. Applicants calculated the value of the surface roughness using the value of the center line average roughness (Ra) among these. The center line average roughness (Ra) is the value obtained by dividing the area of the upper and lower parts of the center line of the cross section by the length of the measurement. Generally, the result can be directly obtained from an automated measuring device.

6 shows an example of obtaining a surface roughness value from a measuring device for the surface of an arbitrary optical disc, wherein the rough cross section of the surface of the optical disc is three-dimensionally shaped and the surface roughness value for each curved portion is determined. As shown in the legend on the right, they are distinguished by section. For example, it can be seen that the surface shown in FIG. 6 has a roughness of 52.11 to 52.64 nm.

Therefore, the turntable according to the present invention has a surface roughness of a predetermined range corresponding to the surface of the support portion, so that when the optical disc is mounted on the turntable according to the present invention, a pair of surface roughnesses of the contact portion between the optical disc and the turntable are provided. Can substantially coincide to increase the friction therebetween.

In addition, in the above embodiment, the contact portion between the optical disk and the turntable is described centering on the lower surface of the optical disk (for example, the clamping region of the protective layer) and the upper surface of the support of the turntable (for example, the disk mounting surface of the support). Naturally, the configuration can be applied.

For example, the contact surface 242 of the contact piece shown in FIG. 4 is a portion that engages with the inner circumferential surface 104 of the central hole of the optical disk, thus also making the surface roughness of the inner peripheral surface of the optical disk substantially coincide with the surface roughness of the contact surface. Can increase the friction between the turntable and the turntable. The surface roughness of the inner circumferential surface of the optical disk can also find an average value by sampling a sufficient number of times, and the frictional force can also be increased by machining the surface roughness of the contact surface corresponding to the found surface roughness value.

On the other hand, in order to apply the surface roughness in the above predetermined range on the surface of the turntable can be utilized a mold used in the manufacture of the turntable. That is, considering that the turntable may be made of a resin material such as PC (polycarbonate) and may be manufactured by a process of injecting the resin into the mold and then injecting the resin, a predetermined surface on the cavity surface of the mold may be formed. By machining to the extent, the surface roughness of the turntable produced by the mold can be adjusted.

According to today's mold processing technology, the surface of the cavity in the mold can be manufactured by adjusting its surface roughness to about 1 μm, so that the surface of the turntable formed by the cavity also has the same roughness. Can be adjusted. The surface roughness of the protective layer, including the clamping area of the optical disk, is also a surface characteristic which is processed by injection, which is determined by the injection conditions such as the resin material and the surface roughness of the mold itself and the injection pressure. The surface roughness of the turntable is also the same. It can be adjusted by.

Increasing friction by adjusting surface roughness can be supported by the following points. If the surface roughness can be adjusted within a certain range in a pair of surfaces in contact with each other, mechanical interference is caused between the two surfaces in contact, and thus the coefficient of friction between the two surfaces can be increased. In other words, if the roughness of the two surfaces in contact is within a range that can interfere with each other, these mechanical interferences will overcome this and require additional energy to produce slip or relative movement, An increase in friction is achieved.

Next, FIG. 7 is a schematic perspective view showing an optical disk device 300 according to another embodiment of the present invention. According to FIG. 7, the optical disk apparatus 300 according to the present invention includes a turntable 310 on which one side of the optical disk is mounted, a turntable driving means 320 such as a motor for rotating the turntable 310, and a turntable ( Optical pickup 330 reciprocally driven toward 310, optical pickup driving means (not shown) for supporting and reciprocating the optical pickup, flexible connector 360 connected to the optical pickup, etc. to implement electrical connection, etc. The turntable 310, the optical pickup 330, the flexible connector 360, and the like are coupled to the base 350. An opening 352 is formed in the base 350 in a direction toward the turntable 310, through which the objective lens 332 of the optical pickup 330 is mounted on the turntable (for example, the turntable 310). , Information recording surface).

As described above, it is noted that the optical disk device shown in FIG. 7 is configured as one embodiment of the present invention, and the features of the present invention are not limited thereto. For example, the configuration of the base, the position of the turntable, and various types of driving means for driving the optical pickup may be used.

In addition, the optical disk device 300 of the present invention is characterized by having a turntable 310 according to an embodiment of the present invention, by adjusting the surface roughness of the turntable 310 to substantially match the surface roughness of the optical disk. It can provide a feature that can increase the friction between the turntable and the optical disk. Since the optical disk is mounted on the optical disk device 300 and used, it is possible to prevent the optical disk from being scattered from the optical disk device (specifically, the turntable) even when rotating at a high speed.

In addition, the optical disk apparatus according to the present invention does not damage the optical disk itself even in the case of mounting / removing the optical disk or requires excessive force in the case of mounting / removing, and industrially, it can lead to light and small reduction of component components. have. At the same time, the optical disk can be mounted and supported by the turntable alone without using a separate clamp member.

The turntable according to the present invention processes the surface roughness of the surface (disk mounting surface or contact surface) on which the optical disk is mounted to substantially coincide with the surface roughness of the optical disk, thereby increasing friction between the optical disk and the turntable. It is possible to provide a self-supporting / mounting type turntable which does not require a friction member and an optical disk device including the same.

When the optical disc is mounted and used in such an optical disc device, even if the optical disc rotates at a high speed, it is possible to prevent the optical disc from being scattered from the device. In this case, no excessive force is required, and industrially, it can lead to light and thin component parts.

Claims (6)

In the turntable for mounting and rotating the optical disk, A support of a circular plate for supporting a clamping area of the optical disk; A fixing part protruding upward from the center of the support part and inserted into a center hole of the optical disc; A shaft portion formed integrally with the lower portion of the support portion and into which a drive shaft is inserted to rotate the turntable; And A plurality of contact pieces interposed on an inner circumferential surface of the center hole with respect to the fixing part to elastically deform the contact piece to support the optical disc. The surface roughness of the support portion is a turntable, characterized in that formed in the range of the average roughness (Ra) of 20 to 100 nm corresponding to the surface roughness of the optical disk. The turntable according to claim 1, wherein the support portion has an annular disk mounting surface along an outer circumferential surface, and the surface roughness of the disk mounting surface is formed within a predetermined range corresponding to the surface roughness of the optical disk. delete A turntable according to claim 1; A turntable driving means coupled to the shaft portion of the turntable, the turntable driving means rotating the turntable; An optical pickup that is reciprocally driven in a direction toward the turntable from one side of the turntable; Optical pickup driving means for reciprocating the optical pickup; And A base on which the turntable driving means and the optical pickup driving means are coupled and fixed; Optical disk device comprising a. The optical disk apparatus according to claim 4, wherein the support portion has an annular disk mounting surface formed along an outer circumferential surface, and the surface roughness of the disk mounting surface is formed within a predetermined range corresponding to the surface roughness of the optical disk. delete

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