CN1157724C - Method for manufacturing multilayer optical information recording carrier - Google Patents

Abstract

The present invention relates to a method for manufacturing an optical information recording medium. The method comprises the following steps: firstly coating a reflective layer on a template having a data pattern. Then coating a light-hardening adhesive polymer resin on a substrate having another data pattern on its surface and coated with a semi-reflective layer, and then laminating the substrate with the template coated with the reflective layer. Then, the resin is irradiated with ultraviolet light to harden it, and then the template is peeled off, thereby forming two reflective layers with data patterns on the substrate. Finally, the two substrates are bonded together with a polymer resin adhesive to obtain a multi-layer optical information recording medium.

Description

Method for manufacturing multilayer optical information recording carrier

technical field

The invention relates to a manufacturing method of an optical information recording carrier, in particular to a manufacturing method of an optical information carrier having a multi-layer recording information reflective layer, such as a double-sided double-layer optical disc.

Background technique

Optical discs are storage media that record information signals in the form of recess and protrusion portions/pits on a disc-shaped thin plastic plate. Due to the high data density of optical discs, and the non-contact method of reading data, it is not easy to cause data damage and has a long storage period. Therefore, optical discs are currently widely used to store audio, video and large-scale software. Traditional optical discs (CD series) are single-sided and single-layer, and the usable capacity of a CD disc with a diameter of twelve centimeters is about 650MB. Recently, the digital audio-visual read-only disc (DVD-ROM) that has begun to be released has the specifications of single-sided double-layer, single-sided single-layer, double-sided single-layer and double-sided double-layer. For a DVD-ROM disc with a diameter of 12 cm, the usable basic capacity of a single-sided single-layer disc is 4.7GB (DVD-5), and that of a double-sided double-layer disc is 17GB (DVD-18). Although the current double-sided double-layer DVD-18 (17GB) optical disk has specifications, there is no commercial product, mainly because the production method has its difficult problems to exist.

Double-sided double-layer DVD-ROM discs are usually made by gluing two 0.6mm thick substrates 10 with double-layer recording data on one side, as shown in Figure 4a and Figure 4b. One of the substrates 10 has a first reflective layer 11 and a second reflective layer 12 on one surface thereof, and a transparent polymer resin layer 13 is formed between the first reflective layer 11 and the second reflective layer 12 . The first reflective layer 11 and the second reflective layer 12 have a reflective surface with a recording data pattern (pit pattern) of recesses and protrusion portions. And the first reflective layer 11, for example, can be a semi-reflective layer (partial reflective) made of gold (Au) or silicon (Si), while the second reflective layer 12 can be a total reflective layer made of aluminum (Al), The recorded data of the two layers can then be read from the other surface of the substrate with an optical reading device. The two aforementioned substrates 10 with double-layer recording data are combined with adhesive 14, wherein the adhesive 14 is placed between the second reflective layer 12 of the two substrates 10, thus completing a double-sided double-layer optical disc piece.

At present, in order to make double-sided double-layer read-only DVD discs, the technologies that can be used to form multi-layer recording data on a substrate mainly include: injection molding (injection molding), photopolymer (Photo Polymer; 2P) And spin plating stripping method (Spin-on AndPeel; SOAP).

The injection molding method uses high temperature and high pressure to press plastic, such as polycarbonate, into a mold (cavity). The male mold (moving surface) and the female mold (fixed surface) of the mold are respectively provided with data patterns ( pit pattern), thus forming a film with data patterns on both sides. After forming a reflective layer on the thin film, it is pasted to an optical disc substrate, and a double-layer recording data is formed on the substrate. This method requires high temperature and high pressure, so the wear and tear on the template is serious. Moreover, the film thickness that can be produced by this injection method has a lower limit, and thinner specifications cannot be produced. In addition, thermal stress or uneven shrinkage of plastic often causes distortion and deformation of finished products, which reduces the qualified rate of products.

The 2P method is to coat a layer of easily deformable polymer resin on a template, and then use high pressure to press the polymer resin to the template, so as to transfer the data pattern on the template to the polymer resin, and then use ultraviolet light to Light irradiation hardens it to form a thin film with a data pattern. Then the film is bonded to a substrate with a data pattern on the surface and coated with a semi-reflective layer, so that the surface of the film with a data pattern faces outward, and is coated with a total reflection layer, thus forming a single-sided double-layer optical disc. piece. If two pieces of the single-sided double-layer optical disk are glued together with the total reflection surfaces facing each other, a double-sided double-layer optical disk, such as DVD-18, can be formed. The disadvantage of this method is that a high-pressure method is required to obtain a relatively good transfer of the data pattern, which causes serious wear on the template. In addition, in the process of adhering the film to the substrate, bubbles or wrinkles are likely to occur, which reduces the yield of the product.

The spin-on-coating peel-off method (SOAP) is to drop a polymer resin solution on the rotating stencil, and after the solvent of the polymer resin solution is volatilized by spin coating, a hardened film with a data pattern can be formed. . Then the film is bonded to a substrate with data patterns on the surface and coated with a semi-reflective layer. Make the surface of the film with the data pattern face outward, and coat with a total reflection layer, thus forming a single-sided double-layer optical disk. If two pieces of the single-sided double-layer optical disc are glued together with the total reflection surfaces facing each other, a double-sided double-layer optical disc can be formed. However, this method still requires a process of bonding the film to the substrate, which is prone to foam or wrinkles and reduces the qualified rate of the product.

In order to solve the problems of severe template wear and low product qualification rate caused by the above-mentioned manufacturing method, it is necessary to provide a new manufacturing method.

Contents of the invention

The purpose of the present invention is to propose a method which consists of directly forming a reflective layer on a template, and then bonding a substrate with a data pattern and coated with a semi-reflective layer to the template by a photocurable resin. The manufacturing method of the optical information recording carrier can reduce the abrasion of the template and improve the qualified rate of the product, thereby solving the problems of the prior art.

The technical scheme that the present invention adopts is that it comprises the following steps:

forming a second reflective layer on a template with a second data pattern (pit pattern);

Coating a light hardening (radiation setting) resin layer on the second reflective layer on the template;

A substrate is provided, one surface of which has a first data pattern, and a first reflective layer is plated on the surface;

attaching the surface of the substrate to the stencil with the resin layer interposed between the substrate and the stencil;

irradiating the resin layer with a light beam to harden it; and

peeling off the template to separate it from the second reflective layer;

The substrate and another substrate having a reflective layer are glued to each other in a reflective layer-to-reflective layer manner.

Another technical scheme that the present invention can adopt is that it comprises the following steps:

forming a second reflective layer on a template with a second data pattern (pit pattern);

A substrate is provided, one surface of which has a first data pattern, and a first reflective layer is plated on the surface;

Coating a light hardening (radiation sitting) resin layer on the first reflective layer of the substrate;

bonding the first reflective layer of the substrate to the second reflective layer of the template, and the resin layer is interposed between the first reflective layer and the second reflective layer;

irradiating the resin layer with a light beam to harden it; and

peeling off the template to separate it from the second reflective layer;

The substrate and another substrate having a reflective layer are glued to each other in a reflective layer-to-reflective layer manner.

The advantages of the present invention are: it can be coated by spin coating method on light hardening resin, does not need high temperature and high pressure, thus reduces the degree of wear on the template, and avoids the problem of distortion caused by thermal stress or residual stress, Thereby improving the qualification rate of the product.

Description of drawings

1a-1f are sectional views of the manufacturing process of the first preferred embodiment of the optical disc manufacturing method of the present invention.

2a-2g are sectional views of the manufacturing process of the second preferred embodiment of the optical disc manufacturing method of the present invention.

FIG. 3 is a cross-sectional view showing a stencil on which a very thin release agent is first coated and then coated with a reflective layer.

4a-4b are cross-sectional views showing two single-sided, double-layered optical disks, the reflective layers of which are glued together to form a double-sided, double-layered optical disk.

Detailed ways

The preferred embodiment of the present invention will be further described in conjunction with the above-mentioned drawings, as shown in Fig. 1a-Fig. 1f, which is the first preferred embodiment of the present invention. First, as shown in Figure 1a, a second reflective layer 22, for example, a total reflective layer of aluminum, gold, silver or silicon with a thickness of 60 nm, is plated on the upper surface of a template 30 by vapor deposition, evaporation or sputtering. , the upper surface has a pre-formed concave-convex data pattern (pitpatter). Then the second reflective layer 22 is transferred with the same data pattern as the template 30 .

Next, as shown in FIG. 1b, on the second reflective layer 22 on the template 30, a layer of radiation setting adhesive polymer resin layer 23 (Adhesive Polymer resin) is coated. As for the method of coating the resin layer 23, for example, a spin coating method (Spin Coating) can be used and the thickness of the resin layer 23 can be controlled at 40-65 μm.

Then, as shown in FIG. 1c, a substrate 20 with a thickness of 0.6mm is provided, on one surface of which there is a pre-formed data pattern, and a first reflective layer 21 is plated on the surface. The first reflective layer 21, for example, It can be a semi-reflective layer such as gold, silver or silicon with a thickness of 18nm. The substrate 20 can be manufactured in a conventional manner by injection molding of polymethylmethacrylate (PMMA) or polycarbonate (PC).

Then, as shown in FIG. 1d, the surface with the data pattern of the substrate 20 is attached to the upper surface of the template 30, and the resin layer 23 is located between the first reflective layer 21 and the second reflective layer 22. . The resin layer 23 is then irradiated with ultraviolet light 24 to harden it. Then, the template 30 is peeled off, because the adhesive force between the second reflective layer 22 and the template 30 is smaller than the adhesive force between the second reflective layer 22 and the cured resin layer 23, so as shown in Figure 1e As shown, two reflective layers 21 and 22 with data patterns are formed on the substrate 20, that is, a single-sided double-layer (dual layer one side) optical disc 40 is obtained.

Finally, as shown in FIG. 1e, the two second reflective layers 22 of the aforementioned single-sided double-layer optical disk 40 and another single-sided double-layer optical disk 50 are opposed to each other, and bonded with adhesive 25 to obtain A disc with dual layer double side.

2a-2b illustrate a second preferred embodiment according to the present invention. At first, Fig. 2 a is with a second reflection layer 22, for example, the total reflection layer of aluminum, gold, silver or silicon with a thickness of 80 mm, is plated on the upper surface of a template 30 by vapor deposition method, vapor deposition method or sputtering method , the upper surface has a pre-formed concave-convex data pattern (pit pattern). Then the second reflective layer 22 is transferred with the same data pattern as the template 30.

Then, as shown in FIG. 2b, a substrate 20 with a thickness of 0.6mm is provided, on one surface of which there is a pre-formed data pattern, and a first reflective layer 21 is plated on the surface. The first reflective layer 21, for example, A semi-reflective layer of gold or silicon with a thickness of 10 nm may be used. The substrate 20 can be manufactured in a conventional manner by injection molding of polymethyl methacrylate (PMMA) or polycarbonate (PC).

Next, as shown in FIG. 2c, on the first reflective layer 21 of the substrate 20, a layer of radiation setting adhesive polymer resin layer 23 (Adhesive Polymer resin) is coated. As for the method of coating the resin layer 23, for example, a spin coating method (Spin Coating) can be used and the thickness of the resin layer 23 can be controlled at 40-65 μm.

Then, as shown in FIG. 2d, the first reflective layer 21 coated with the resin layer 23 of the substrate 20 is attached to the upper surface of the template 30 relative to each other, so that the resin layer 23 is between Between the first reflective layer 21 and the second reflective layer 22 .

As shown in FIG. 2e, the resin resin 23 is irradiated with ultraviolet light 24 to harden it. Then, the stencil 30 is peeled off, because the adhesion between the second reflective layer 22 and the stencil 30 is smaller than the adhesion between the second reflective layer 22 and the hardened resin layer 23, as shown in Fig. 2f As shown, two reflective layers 21 and 22 with data patterns are formed on the substrate 20 to obtain a dual later one side optical disc 40 .

Finally, as shown in FIG. 2g, the two second reflective layers 22 of the aforementioned single-sided double-layer optical disk 40 and another single-sided double-layer optical disk 50 are opposed to each other, and bonded with adhesive 25 to obtain a single-sided double-layer optical disk. Double-sided double-layer (dual layer double side) disc.

In the above two embodiments, the step of peeling off the stencil 30 is to separate the second reflective layer 22 from the stencil 30 by taking advantage of the property that the second reflective layer 22 and the stencil 30 have less adhesive force. However, in order to separate the second reflective layer 22 from the stencil 30 more easily when the stencil 30 is peeled off, as shown in FIG. A very thin layer of release agent 31 is coated on the stencil 30, and then the aforementioned next steps are carried out.

What has been described above is only a preferred embodiment of the present invention, and is not intended to limit the implementation scope of the present invention. Those skilled in the art can make appropriate modifications without departing from the spirit of the present invention. For example, the The substrate can also have other thicknesses, such as 1.2mm, 0.5mm, 0.3mm to meet the requirements of other specifications, and the thickness and material of the first reflective layer and the second reflective layer can also have other options, for example, the material Substances such as aluminum, silver, gold, copper, chromium or silicon or alloys thereof can be used. In addition, the thickness of the light-curing resin layer can also be selected according to different specification requirements, for example, 10 μm to 80 μm; that is, all changes and modifications made according to the protection scope of the patent application of the present invention are all protected by the claims of the present invention covered by the scope.

Claims (12)

1. A method for manufacturing a multilayer optical information recording carrier, characterized in that it at least comprises the following steps: forming a second reflective layer on a template with a second data pattern; coating an optical disc hardening resin layer on the second reflective layer on the template; A substrate is provided, one surface of which has a first data pattern, and a first reflective layer is plated on the surface; attaching the surface of the substrate to the stencil with the resin layer interposed between the substrate and the stencil; irradiating the resin layer with a light beam to harden it; and peeling off the template to separate it from the second reflective layer; The substrate and another substrate having a reflective layer are glued to each other in a reflective layer-to-reflective layer manner. 2. The method for manufacturing a multilayer optical information recording carrier as claimed in claim 1, wherein the step of coating a photohardening resin layer on the second reflective layer on the template includes rotating coating method to coat the resin layer. 3. The method for manufacturing a multi-layer optical information recording carrier as claimed in claim 1, wherein the material of the second reflective layer is selected from aluminum, silver, gold, copper, chromium, or silicon. Any kind of substance or alloy in the group. 4. The method for manufacturing a multilayer optical information recording carrier as claimed in claim 1, wherein the material of the first reflective layer is any one selected from the group consisting of gold, silver, or silicon . 5. The method for manufacturing a multilayer optical information recording carrier according to claim 1, wherein the thickness of the photocurable resin layer is 10 μm˜80 μm. 6. The method for manufacturing a multi-layer optical information recording carrier as claimed in claim 1, characterized in that said substrate has a thickness of 0.1-0.2 mm. 7. A method for manufacturing a multilayer optical information recording carrier, characterized in that it at least comprises the following steps: forming a second reflective layer on a template with a second data pattern; A substrate is provided, one surface of which has a first data pattern, and a first reflective layer is plated on the surface; coating a photocurable resin layer on the first reflective layer of the substrate; bonding the first reflective layer of the substrate to the second reflective layer of the template, and the resin layer is interposed between the first reflective layer and the second reflective layer; irradiating the resin layer with a light beam to harden it; and peeling off the template to separate it from the second reflective layer; The substrate and another substrate having a reflective layer are glued to each other in a reflective layer-to-reflective layer manner. 8. The method of manufacturing a multi-layer optical information recording carrier as claimed in claim 7, characterized in that the step of coating a photocurable resin layer on the first reflective layer of the substrate comprises spin coating the resin layer. 9. The method for manufacturing a multilayer optical information recording carrier as claimed in claim 7, wherein the material of the second reflective layer is selected from aluminum, silver, gold, copper, chromium or silicon. Any substance or alloy in a group. 10. The method for manufacturing a multilayer optical information recording carrier as claimed in claim 7, wherein the material of the first reflective layer is any one selected from the group consisting of gold, silver or silicon. 11. The method for manufacturing a multilayer optical information recording carrier according to claim 7, wherein the thickness of the photocurable resin layer is 10 μm˜80 μm. 12. The method for manufacturing a multi-layer optical information recording carrier according to claim 7, wherein the substrate has a thickness of 0.1-1.2 mm.

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