CN101252008A - Tray device for manufacturing optical disk and method of manufacturing the same - Google Patents

Abstract

A tray apparatus for manufacturing an optical disc, such as a BD blue-ray disc, includes a tray inner layer, a rotation shaft, and a vacuum duct. The tray device also comprises a tray outer ring layer which is arranged on the tray inner ring layer around the outer periphery of the tray inner ring layer, and when an optical disk is placed on the tray inner ring layer, the upper surface of the tray outer ring layer and the upper surface of the optical disk are kept on the same horizontal plane. The outer ring layer of the tray is arranged on the outer periphery of the inner ring layer of the tray, which is equivalent to enlarging the diameter of the optical disc, so that the optical disc has a virtual outer ring area. Thus, when the protective layer is coated, the tray device rotates with the optical disk, so that good coating uniformity can be obtained on the protective layer in the whole range of the optical disk. In addition, in order to prevent the disk from being scratched when the disk is taken out, a certain gap is formed between the tray inner ring layer and the tray outer ring layer. The invention also discloses a method for manufacturing the tray device.

Description

Tray device for manufacturing optical disc and method of manufacturing same

technical field

The invention relates to the field of optical disc manufacturing, in particular to a tray device for manufacturing optical discs, which is used for coating optical discs, especially a protective layer of an optical data carrier such as a BD Blu-ray disc. The invention also relates to a method of manufacturing the above-mentioned tray device.

Background technique

Since the latest optical discs such as BD Blu-ray disc technology adopt shorter wavelength (450nm) and larger numerical aperture (NA=0.85), the requirements for flatness of the disc are greatly improved, and the vertical direction of the laser reading plane The precision is required to be controlled within the range of ±2μm, so the BD disc has very strict requirements on the uniformity and thickness precision of the protective layer. At the same time, in order to protect the surface of the disc from being scratched, in the past, a method of coating a layer of hard film on the protective layer was generally used to protect the disc. Now by choosing the appropriate material for the protective layer, the protective layer can also play the protective role of the hard film. Therefore, the protective layer of the BD disc is an indispensable and important part of the optical disc. The glue coating of the protective layer directly affects the quality of the disc, so it is necessary to continuously study and improve the glue coating process of the protective layer of the BD Blu-ray disc.

The current glue coating method for the protective layer of the BD Blu-ray Disc is mainly to directly form a 0.1 mm protective layer on a substrate with a thickness of 1.1 mm. Generally, the glue is put on the disc by the glue-down device, and then the disc is rotated at a high speed by the tray device so that the glue is evenly coated on the disc. Due to the effect of centrifugal force, this gluing process will cause the glue on the disc to change from thin to thick along the radial direction from the center of the disc. Through multiple process tests, it is found that the thickness of the protective layer in the area between the disc radius of 20mm-50mm, that is, the disc center area and the inner ring area, is relatively uniform, which can meet the disc requirements, but between the disc radius of 50mm-60mm The protective layer in the area between, that is, the outer ring area is too thick, so that the uniformity of the protective layer on the entire disc is difficult to meet the strict requirements.

Contents of the invention

The present invention is made in view of the above-mentioned defect in the prior art.

It is an object of the present invention to provide a tray device for the manufacture of optical discs, in particular an optical data carrier such as a BD Blu-ray Disc, for use when gluing the protective layer of an optical disc.

Another object of the present invention is to provide a method of manufacturing the above-mentioned tray device.

According to the present invention, a tray device for manufacturing optical discs, comprising: an inner ring layer of the tray for placing an optical disc disc thereon; a rotating shaft extending vertically through the center of the inner ring layer of the tray, the optical The central hole of the disc is positioned on the rotating shaft; and a vacuum pipeline is used to adsorb the disc on the inner ring layer of the tray through a pressure difference, and it is characterized in that: the tray device also includes an outer ring layer of the tray, and the outer ring layer of the tray is A layer is disposed on the inner layer of the tray around the outer periphery of the inner layer of the tray, and when the optical disc is placed on the inner layer of the tray, the upper surface of the outer layer of the tray is kept at the same level as the upper surface of the optical disc superior.

Preferably, there is a gap between the outer ring layer of the tray and the inner ring layer of the tray. The width of the gap is preferably between 0.1mm-1.0mm.

The diameter of the inner ring layer of the tray is 120mm, and the diameter of the outer ring layer of the tray is 130mm-200mm.

The tray outer ring layer may be integrally formed with the tray inner ring layer.

According to the present invention, a method for manufacturing the above-mentioned tray device comprises the following steps:

Provide the inner ring layer of the tray;

forming a tray outer ring layer and disposing the tray outer ring layer on the tray inner ring layer around the outer periphery of the tray inner ring layer;

The outer layer of the tray and the inner layer of the tray are arranged so that a gap is formed at the junction of the outer layer of the tray and the inner layer of the tray, and when the optical disc is placed on the inner layer of the tray, the The upper surface of the outer layer of the tray is kept on the same level as the upper surface of the optical disc.

The width of the gap is preferably between 0.1mm-1.0mm.

Optionally, the step of forming the outer tray layer includes integrally forming the outer tray layer with the inner tray layer.

The diameter of the inner ring layer of the tray is generally 120mm, and the diameter of the outer ring layer of the tray is preferably 130mm-200mm.

By setting the outer layer of the tray on the outer periphery of the inner layer of the tray, it is equivalent to increasing the diameter of the optical disc, so that the optical disc has a virtual outer ring area, and the original outer ring area of the optical disc becomes the inner ring area. In this way, when coating the protective layer, the tray device rotates with the optical disk, so that good uniformity can be obtained on the protective layer in the entire range of the optical disk. In addition, since a certain gap is formed between the inner ring layer of the tray and the outer ring layer of the tray, scratches on the disc are avoided when the disc is taken.

Description of drawings

The present invention is described in detail below with reference to accompanying drawing, wherein:

Fig. 1 is the sectional view of the structure of the tray device in the prior art;

2 is a cross-sectional view of the structure of the tray device according to the present invention;

Fig. 3 is an enlarged schematic view of part X-X in Fig. 2, which more clearly shows the outer ring layer of the tray and the gap between the inner ring layer and the outer ring layer of the tray.

Detailed ways

The preferred embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

Referring to FIG. 1 , FIG. 1 is a schematic structural diagram of a tray device for manufacturing optical discs such as DVDs in the prior art. The tray device comprises: a tray 1, whose diameter d1 is 120 mm, for placing an optical disc 3 thereon; a rotating shaft 2, which extends vertically through the center of the tray 1, and the center hole of the optical disc 3 is positioned on the rotating shaft 2; and a vacuum pipe 4, which is used to adsorb the optical disc 3 on the tray 1 through pressure difference (negative pressure). Since vacuum lines and their use are known in the art, no further description of their structure will be given.

Fig. 2 has shown the structure of tray device according to the present invention, and it comprises: tray inner ring layer 1a, is used for placing optical disc disk 5 thereon; Rotation shaft 7, it extends vertically through described tray inner ring layer 1a The center of the optical disc disc 5 is positioned on the rotating shaft 7; and the vacuum pipe 6 is used to adsorb the optical disc disc 5 on the inner ring layer 1a of the tray through a pressure difference (negative pressure). Further, the tray device of the present invention further includes a tray outer ring layer 1b, and the tray outer ring layer 1b is disposed on the tray inner ring layer around the outer peripheral edge of the tray inner ring layer 1a. The pallet outer ring layer 1b thus constitutes an elongation with respect to the pallet 1 ( FIG. 1 ) of the prior art. It can be understood that the inner ring layer 1a of the tray has the same function as the tray 1 shown in FIG. 1 , that is, it is used to place an optical disc thereon.

Between the outer tray layer 1b and the inner tray layer 1a is formed a gap 8 (see more clearly in Fig. 3), the width h of which gap is preferably between 0.1 mm - 1.0 mm. Adopting such a gap structure can prevent the disc from being scratched when the disc is taken out.

Fig. 3 is an enlarged schematic view of the part X-X in Fig. 2, which more clearly shows the structure of the tray outer ring layer 1b, and the gap 8 between the tray inner ring layer 1a and the tray outer ring layer 1b.

As clearly shown in Figure 3, when the optical disc disc 5 was placed on the tray inner ring layer 1a, the upper surface of the tray outer ring layer 1b was kept on the same level as the upper surface of the optical disc disc 5, so that by Setting the outer layer of the tray on the outer periphery of the inner layer is equivalent to increasing the diameter of the optical disc, so that the optical disc has a virtual outer ring area, and the original outer ring area of the optical disc becomes the inner ring area. In this way, when the protective layer is coated, the tray device rotates with the optical disk, so that when the glue is applied, a good coating uniformity can be obtained on the protective layer in the entire range of the optical disk.

In the present invention, the diameter d1 of the tray inner ring layer 1a is generally 120mm, and the diameter d2 of the tray outer ring layer 1b is preferably 130mm-200mm, so as to obtain the above technical effects. Of course, the value D2 can be changed according to different process requirements.

It should be understood that the tray outer ring layer 1b and the tray inner ring layer 1a in the present invention can be parts formed separately, and then the tray outer ring layer 1b is set to the outer periphery of the tray inner ring layer 1a by existing joining methods such as welding edge. Of course, the tray outer ring layer 1b and the tray inner ring layer 1a can also be integrally formed, which makes the whole manufacturing process simpler.

The mode of operation of the present invention is described below according to Fig. 2: before coating the protective layer of optical disc such as BD optical disc, optical disc disc 5 is placed on the rotating shaft 7 of tray device, promptly whole disc is adhered in the tray intactly on the ring layer 1a, and through the air pressure difference formed by the vacuum pipe 6, the disk 5 is tightly adsorbed. When coating starts, the rotating shaft 7 starts to drive the entire tray to rotate, wherein the disc 5 and the outer layer 1b of the tray rotate on the same horizontal plane, so that the outer layer 1b becomes (equivalent to) the virtual outer layer of the optical disc. circle area. While rotating, glue is applied to the central area of the disc by a glue applying device (not shown), and during the rotation, the BD disc is evenly coated with a protective layer. After coating is complete, remove the disk. Due to the existence of the gap 8 between the inner ring layer of the tray and the outer ring layer of the tray, the disc can be prevented from being scratched by touching the outer ring layer 1 b of the tray when the disc is taken. In this way, the uniformity of the protective layer applied over the entire disc is achieved by replacing the coating unevenness on the actual outer peripheral area of the optical disc by the coating unevenness generated on the virtual outer peripheral area of the optical disc, strict requirements have been met.

To sum up, the present invention has such technical effects: by designing the tray outer ring layer for the existing optical disc tray device, it is equivalent to increasing the diameter of the optical disc, so that the optical disc has a virtual outer ring area, and the optical disc The original outer circle area becomes the inner circle area. In this way, when the protective layer is coated, the tray rotates with the optical disk, and the protective layer in the entire range of the optical disk can achieve good coating uniformity, which meets the high requirements required by the optical disk. Since a certain amount of clearance is designed in the tray structure, the optical disc is prevented from being scratched when the optical disc is taken. Compared with the tray device in the prior art, the tray device of the present invention has the further advantages of simple structure, easy processing and low cost.

According to another aspect of the present invention, a method for manufacturing the above-mentioned tray device is provided, especially a method for manufacturing an optical disc tray device used when uniformly coating a 0.1mm protective layer on a BD Blu-ray substrate. The method can improve the gluing process of the protective layer of the existing optical disc, especially the BD Blu-ray, and improve the uniformity of the spin coating glue.

In the method of the present invention, its design principle is: the size that is used for common CD such as the tray of DVD is the same with CD size, and diameter is all usually 120mm, as shown in d1 among Fig. 1, 2; The tray device of present design can be On the basis of the original size, the diameter is extended by a certain length, so that the entire diameter of the tray becomes between 130mm-200mm, as shown in d2 in Figure 2. The specific value of d2 can be determined according to the requirements of the process parameters to form a virtual disk. Outer area. The structure of the extended part is shown in Figure 3, wherein the surface of the outer layer 1b of the tray and the surface of the optical disc 5 placed on the inner layer 1a of the tray remain on the same horizontal plane, which is equivalent to increasing the diameter of the optical disc. , that is, the enlarged area of the tray is the virtual outer ring area of the optical disc, and the outer ring area of the optical disc itself evolves into the inner ring area. Then, when coating the protective layer, the tray rotates with the optical disk, so that the uniformity of the entire disk protective layer of the optical disk can meet the required requirements. In order not to be scratched by the tray when picking up the disc, a gap 8 with a space width h of 0.1 mm-1 mm is designed between the disc and the extended part of the tray, as shown in FIG. 3 .

Specifically, a method for manufacturing the above-mentioned tray device for manufacturing optical discs includes the following steps:

Provide tray inner ring layer 1a;

Forming the tray outer ring layer 1b, and disposing the tray outer ring layer 1b on the tray inner ring layer 1a around the outer peripheral edge of the tray inner ring layer 1a;

The outer layer of the tray and the inner layer of the tray are arranged so that a gap 8 is formed at the junction of the outer layer of the tray and the inner layer of the tray, and when the disc is placed on the inner layer of the tray , the upper surface of the outer layer of the tray is kept on the same level as the upper surface of the optical disc.

The width h of the gap 8 is preferably between 0.1mm-1.0mm.

Optionally, the step of forming the tray outer ring layer includes forming the tray outer ring layer 1b and the tray inner ring layer 1a separately, and then joining them together to form a whole, or the tray outer ring layer Layer 1b is integrally formed with said pallet inner ring layer 1a.

The diameter d1 of the tray inner ring layer 1a is usually 120mm, and the diameter d2 of the tray outer ring layer 1b is preferably 130mm-200mm, and the value D2 depends on the required process standard.

The present invention has been exemplarily described above, and it should be understood that, without departing from the spirit of the present invention and the scope of protection of the appended claims, any variation, modification or equivalent replacement all fall within the protection scope of the present invention Inside.

Claims (11)

1. A tray device for manufacturing optical discs, comprising: an inner ring layer of a tray for placing an optical disc disc thereon; a rotating shaft extending vertically through the center of the inner ring layer of the tray, and the optical disc disc The central hole of the center hole is positioned on the rotating shaft; and the vacuum pipe is used to adsorb the optical disk on the inner ring layer of the tray through the pressure difference, and it is characterized in that: the tray device also includes an outer ring layer of the tray, and the outer ring layer of the tray surrounds The outer periphery of the inner layer of the tray is arranged on the inner layer of the tray, and when the optical disk is placed on the inner layer of the tray, the upper surface of the outer layer of the tray is kept on the same level as the upper surface of the optical disc. 2. The tray device for an optical disc according to claim 1, there is a gap between the outer layer of the tray and the inner layer of the tray. 3. The tray device for an optical disc according to claim 2, the width of the gap is between 0.1mm-1.0mm. 4. The tray device for an optical disc according to any one of claims 1-3, wherein the inner layer of the tray has a diameter of 120mm, and the outer layer of the tray has a diameter of 130mm-200mm. 5. The tray device for an optical disc according to any one of claims 1 to 3, wherein the tray outer ring layer is integrally formed with the tray inner ring layer. 6. The tray device for an optical disc according to claim 4, the tray outer ring layer is integrally formed with the tray inner ring layer. 7. A method of manufacturing the tray device for manufacturing optical discs according to claim 1, comprising the steps of: Provide the inner ring layer of the tray; forming a tray outer ring layer and disposing the tray outer ring layer on the tray inner ring layer around the outer periphery of the tray inner ring layer; The outer layer of the tray and the inner layer of the tray are arranged so that a gap is formed at the intersection of the outer layer of the tray and the inner layer of the tray, and when the optical disc is placed on the inner layer of the tray, The upper surface of the outer layer of the tray is kept on the same level as the upper surface of the optical disc. 8. The method according to claim 7, the width of the gap is between 0.1mm-1.0mm. 9. The method of claim 7 or 8, the step of forming the outer tray layer comprising forming the outer tray layer integrally with the inner tray layer. 10. The method according to claim 7 or 8, wherein the diameter of the inner layer of the tray is 120mm, and the diameter of the outer layer of the tray is 130mm-200mm. 11. The method according to claim 10, the diameter of the inner ring layer of the tray is 120mm, and the diameter of the outer ring layer of the tray is 130mm-200mm.

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