TWI436358B - Structure-reinforcing layer for an optical disc, optical disc having an adhesive layer, and optical disc having a structure-reinforcing layer and the method of fabricating the same - Google Patents

Description

Structural reinforcing layer for optical disc, optical disc with adhesive layer, and structure Reinforced layer optical disc and manufacturing method thereof

The present invention relates to an optical disc and a method of manufacturing the same, and more particularly to an optical disc having a structural reinforcing layer and a method of manufacturing the same.

Optical discs can store data in a variety of formats, and are the most convenient storage medium in the next-generation optical storage market, and can be applied in a wide range of applications, such as library storage, data backup, electronic publishing, image data storage, personal medical records. Management and so on.

The thickness of the conventional optical disc is about 1.2 mm. With the advancement of the process technology and the need to reduce the cost, the Republic of China No. I267847 discloses an optical disc whose thickness is smaller than the thickness of the support portion. The thickness is about 0.6 mm. However, as the thickness of the optical disk is thinner and thinner, the vibration generated by the optical disk at high speed causes instability in reading and writing.

In order to solve the vibration problem caused by the operation of the optical disc while enhancing the structure of the optical disc, the Republic of China Patent No. I322417 discloses an optical disc having a damping layer on the surface of the recording portion for reducing the time of the optical disc being affected by the vibration. The amplitude of the vibration, that is, the instability of the optical disc, reduces the problems that may occur when reading or writing. However, although the damping layer can enhance the structure of the optical disc and improve the vibration of the optical disc under high-speed operation, on the other hand, since the damping layer and the substrate of the optical disc are made of different materials, and the linear expansion coefficients of the two are The difference is very large (as will be explained later in Table 1). When the optical disc experiences environmental impact (change in temperature, humidity, etc.), the optical disc may be deformed upwardly or downwardly, thereby making it difficult for the lightning reading head to focus. Make the data read or burned incorrectly. Table 1 below shows the coefficient of linear expansion of the commonly used damping layer (Rubber) and substrate material (PC, Polycarbonate) of the optical disc. The first column shows the PC and three rubber materials, and the second column shows the linear expansion coefficient of the PC and the three rubbers. The third column shows the percentage difference between the linear expansion coefficients of the PC and the three rubbers. As shown in Table 1, the percentage difference between the linear expansion coefficients of PC and the three rubbers is really different (both greater than 100%), and, when the disc is When the difference between the thermal expansion coefficients of the substrate (PC) and the damping layer (Rubber) is greater, the deformation of the optical disc after the environmental impact is relatively large, so the possibility of reading or burning the optical disc is also likely. increase.

In the meantime, U.S. Patent No. 6,461,711 discloses an optical disc having a stable layer, the material of which is different from the material of the substrate (PC), and the density of the stabilizing layer (about 1.4 to 4.2 g/cm ³ ) is larger than that of the substrate. Density (about 1g/cm ³ ), such a stable layer with a higher density adheres to a substrate of lower density to provide a stable vibration function. Similarly, since the material of the stable layer of the optical disc is different from the material of the substrate, when the optical disc undergoes an environmental impact, deformation of the upward or downward bending may occur, thereby causing an incorrect reading or burning of the data.

In view of this, there is a need to improve the solution of the optical disc deformation problem caused by the difference between the damping layer or the stable layer material and the substrate material.

The present invention is intended to solve the problem of optical disc deformation caused by the optical disc having the damping layer or the stabilizing layer after the environmental impact is caused by the material of the damping layer or the stabilizing layer being different from the substrate.

In order to solve the above problems, an embodiment of the present invention provides an optical disc having a structural reinforcement layer, comprising: an annular support portion, an annular recording portion, and a structural reinforcement layer. The annular support portion is used to support the optical disc. The annular recording portion is disposed on the outer side of the annular support portion, and has a thickness smaller than the thickness of the annular support portion, one side of the annular recording portion is the reading side, and the opposite side is the non-reading side, the ring shape The recording portion includes: a transparent substrate on the reading side and a transparent material to provide laser penetration; and a multi-layer functional film layer on the transparent substrate and including at least one recording layer and at least one reflection Floor. The structural reinforcement layer is located on the multi-layer functional film layer for reinforcing the structure of the optical disc, comprising: a structural reinforcement sheet, the material of which is different from the material of the transparent substrate; and a bonding layer for reinforcing the structure The sheet is attached to the multi-layer functional film layer, and the product of the shear stress receiving force of the adhesive layer and the ratio of the coated area is less than 114 g/cm ² , and the structural strengthening layer is subjected to the shear stress of 114 g/cm ² or more. The sheet may be slipped, wherein the ratio of the coated area of the adhesive layer refers to the ratio of the coated area of the adhesive layer applied to the annular recording portion divided by the area of the annular recording portion.

Another embodiment of the present invention provides a method of manufacturing an optical disc having a structural reinforcing layer, comprising: preparing an optical disc including an annular recording portion and an annular supporting portion, and then forming a structural reinforcement on the annular recording portion. Floor. The annular recording portion of the optical disc is disposed on the outer side of the annular support portion, and the thickness thereof is smaller than the thickness of the annular support portion, one side of the annular recording portion is the reading side, and the opposite side is non-reading. a side, wherein the annular recording portion comprises: a transparent substrate on the reading side and being transparent to provide laser penetration; and a multilayer functional film layer on the transparent substrate and including at least one record a layer and at least one reflective layer. The structural reinforcing layer is used for reinforcing the structure of the optical disc, and comprises: a structural reinforcing sheet, the material of which is different from the material of the transparent substrate of the annular recording portion; and a bonding adhesive layer for bonding the structural reinforcing sheet The product of the shear stress bearing capacity of the adhesive layer and the ratio of the coated area is less than 114 g/cm ² to the annular recording portion, and the structural reinforcing sheet is generated when the structural reinforcing layer is subjected to a shear stress of 114 g/cm ² or more. The ratio of the coated area of the adhesive layer refers to the ratio of the coated area of the adhesive layer applied to the annular recording portion divided by the area of the annular recording portion.

In addition, another embodiment of the present invention provides a structural reinforcement layer for an optical disc for attaching to a recording portion of the optical disc to strengthen the structure thereof, comprising: a structural reinforcing sheet, a material and a transparent base of the optical disc The material of the material is different; and a bonding layer for bonding the structural reinforcing sheet to the optical disc, the product of the shear stress tolerance of the adhesive layer and the ratio of the coated area is less than 114 g/cm ² , when the structure When the reinforcing layer is subjected to a shear stress of 114 g/cm ² or more, the structural reinforcing sheet may be slipped, wherein the ratio of the coated area of the adhesive layer refers to the coated area of the adhesive layer applied to the recording portion. Divided by the ratio of the area of the record department.

Another embodiment of the present invention also provides an optical disc having a laminated adhesive layer, wherein the thickness of the recording portion of the optical disc is smaller than the thickness of the supporting portion, and the adhesive layer is coated on the recording portion of the optical disc, and The product of the shear stress tolerance of the adhesive layer and the ratio of the coated area is less than 114 g/cm ² , wherein the ratio of the coated area of the adhesive layer refers to the coating of the adhesive layer on the recording portion. The area of the cloth divided by the area of the area of the record.

The invention can effectively reduce the deformation amount of the optical disc after the environmental impact due to the structural reinforcement sheet and the substrate material, thereby improving the read and write characteristics of the optical disc to ensure that the optical disc can be maintained after undergoing environmental impact. Its normal function.

The content of the present invention is described in detail below with reference to the drawings, and the same reference numerals in the drawings represent the same elements. It will be apparent to those skilled in the art that the details of the invention are to be construed as illustrative only.

The optical disc of the present invention comprises a pre-recorded optical disc and a recordable optical disc.

1A shows an optical disc having a structural reinforcing layer according to an embodiment of the present invention, and FIG. 1B shows an enlarged view of an annular recording portion of the optical disc of FIG. 1A. As shown in FIG. 1A, an optical disc 1 having a structural reinforcing layer according to an embodiment of the present invention includes an annular support portion 2, an annular recording portion 3, and a structural reinforcement layer 4. The annular support part 2 At the center of the optical disc 1 for supporting the optical disc 1. The annular recording portion 3 is disposed on the outer side of the annular support portion 2 for recording data, and has a thickness smaller than the thickness of the annular support portion 2, and one side of the annular recording portion 3 is the laser head reading side (ie, The lower side of the optical disc in Fig. 1A, and the opposite side is the non-reading side (i.e., the upper side of the optical disc in Fig. 1A). The structural reinforcement layer 4 is disposed on the non-reading side of the annular recording portion 3. Since the thickness of the annular recording portion 3 of the optical disk is smaller than the thickness of the annular support portion 2, the structural reinforcement layer 4 can be used to reinforce the optical disk. The structure of 1. Further, as shown in FIG. 1B, the annular recording portion 3 further includes a transparent substrate 5 and a multilayer functional film layer 6. The transparent substrate 5 is located on the reading side of the annular recording portion 3 and is made of a transparent material to provide laser penetration. The multilayer functional film layer 6 is disposed on the transparent substrate 5 and includes at least one recording layer and at least one reflective layer, and, in this example, the multilayer functional film layer 6 has a three-layer structure. In addition, the structural reinforcement layer 4 further includes a structural reinforcement sheet 7 and a bonding adhesive layer 8 between the structural reinforcement sheet 7 and the multilayer functional film layer 6 for bonding the structural reinforcement sheet 7 to On the multilayer functional film layer 6, the optical disk 1 having the structural reinforcing layer 4 is formed in this manner.

Referring to the optical disc structure shown in FIGS. 1A and 1B, when the structural reinforcing sheet 7 and the transparent substrate 5 of the optical disc are different in material (that is, the linear expansion coefficients of the two are different), the optical disc is After experiencing environmental impact (temperature change, moisture infiltration, temperature difference of reading and burning, etc.), since the linear expansion coefficients of the structural reinforcing sheet 7 and the transparent substrate 5 are different, the amount of expansion or contraction is also different, so This causes the optical disc 1 to undergo deformation or stress residual of upward bending or downward bending, thereby causing the lightning reading head to be difficult to focus and making data reading or burning errors. Therefore, in order to solve the problem, the present invention provides an optical disc 1 having the above-described structural reinforcing layer 4, wherein the adhesive layer 8 disposed between the structural reinforcing sheet 7 and the annular recording portion 3 has a displaceable property, that is, When the shear stress of the structural reinforcement layer 4 is greater than the ultimate shear stress that the adhesive layer 8 can withstand, since the adhesive layer 8 cannot withstand the shear stress, its displaceable property makes the structural reinforcement sheet 7 Sliding relative to the bonding layer 8, which can release the shear stress in the optical disc 1 and buffer the deformation of the optical disc 1 bent upward or downward, thereby reducing the possibility of incorrect reading or burning of the data. Therefore, the optical disc 1 having the structural reinforcing layer 4 of the embodiment of the present invention, wherein the adhesive layer 8 is used not only for the structure The reinforcing sheet 7 is attached to the annular recording portion 3 while also providing the function (displaceable performance) as described above.

Currently, optical discs use Polycarbonate (PC) as the material of the transparent substrate. Therefore, when the linear expansion coefficient of the material of the structural reinforcing sheet 7 selected by the optical disc is larger than the linear expansion coefficient of the PC, the amount of deformation or residual stress which is bent upward or downward after undergoing an environmental impact is relatively It is larger, and therefore, there is a need for a bonding layer 8 having displaceable properties. When the optical disc 1 bears more than the ultimate shear stress that the adhesive layer 8 can withstand due to the impact of the environment, the displaceable property of the adhesive layer 8 can make the structural reinforcing sheet 7 relative to the adhesive layer 8 By sliding, it is possible to reduce deformation or residual stress caused by the difference in the amount of temperature expansion between the structural reinforcing sheet 7 and the transparent substrate 5. Moreover, the quantitative property of the displaceable property of the adhesive layer can be expressed by the ultimate shear stress that can be withstood, and the success rate of the actual optical disc burning and reading is judged as the pros and cons. The experiment of measuring the maximum shear stress that can be withstood by several adhesive layers will be described below.

Figure 2 is an experiment showing the measurement of the shear stress tolerance of various adhesive layers. As shown in FIG. 2A and FIG. 2B, two strips of plastic sheets 9 and 11 each having a material of PC are prepared, and the plastic sheet 11 is attached to the plastic sheet 9 by laminating the adhesive layer 10. As shown in FIG. 2C, the plastic sheet 9 is fixed and suspended on the plastic sheet 11 to simulate the condition of the plastic sheets 9 and 11 and the adhesive layer under shear stress, and then, the plastic sheet 11 is suspended with different weights. Next, after six minutes of measurement, the amount of movement of the plastic sheet 11 due to the hanging weight is measured and recorded. If the plastic sheet 11 completely falls off within six minutes, the amount of movement is recorded as infinite (∞). In this experiment, the sensor adhesives (A001, A003, A002, A001-a, A001-b, A004 and X001) which are self-configured by Juyi Technology Co., Ltd. were used as the adhesive layer 10, and the adhesive layer 10 was coated. Between the area A of the plastic sheet 9 (the area of the area A is 6.25 cm ² ), and the ratio of the coated area is 100% (that is, the area coated with the adhesive layer is 6.25 x 100% cm ² ) Here, the coated area ratio refers to the ratio of the coated area of the adhesive layer 10 applied to one area A of the plastic sheet 9 divided by the area of the area A. When the weight of the suspension is sufficient to cause the plastic sheet 11 to start moving, the weight of the suspension divided by the coated area of the adhesive layer 10 is the ultimate shear stress that the adhesive layer can withstand, and the experimental results are recorded below. In Table 2.

According to the basic definition of shear stress, the shear stress is the shear force per unit area (ie, the shear stress is equal to the shear force divided by the force area), that is, the shear stress is inversely proportional to the force area, therefore, The ultimate shear stress value of the adhesive layer can be reduced by reducing the coated area of the adhesive layer. Next, when the proportion of the coated area of the adhesive layer is lowered as measured in the manner of FIG. 2, the ultimate shear stress value that the adhesive layer can withstand is adhered. In this experiment, using the adhesive layer A001-b as an example, the adhesive layer A001-b is dispersedly applied to one area A of the plastic sheet 9 (the area of the area A is 6.25 cm ² ), and The area of the adhesive layer coated on the 6.25 cm ² area A was 32% (that is, the area coated with the adhesive layer was actually 6.25 x 32% cm ² ), and the experimental results are also recorded in the following table. 2 in.

Table 2 below shows the experimental results of the degree of shear stress tolerance of various adhesive layers. The first column shows the glue type of the adhesive layer, the second column shows the proportion of the coated area of the adhesive layer, and the third column shows the plastic. The amount of movement of the sheet 11 under different shear stresses, and the fourth column shows the ultimate shear stress value of the adhesive layer. According to the experimental results shown in Table 2, the adhesive layer A001 can withstand the ultimate shear stress value of about 6.8 g/cm ² in the case where the coating area of the adhesive layer applied to the optical disk is 100%. The ultimate shear stress value of the adhesive layer A003 can be about 49.3 g/cm ² ; the ultimate shear stress value of the adhesive layer A002 can be about 68.3 g/cm ² ; the adhesive layer A001-a can withstand The ultimate shear stress value is about 113.8 g/cm ² ; the ultimate shear stress value of the adhesive layer A001-b can be about 398.3 g/cm ² ; the ultimate shear stress value of the adhesive layer A004 can be about 838.7. g/cm ² ; and the adhesive layer X001 can withstand an ultimate shear stress value of about 1019.8 g/cm ² . Further, in the case where the coating area of the adhesive layer A001-b applied to the optical disk sheet is 32%, the adhesive layer A001-b can withstand an ultimate shear stress value of about 117.6 g/cm ² . Comparing the limit shear stress values of the coated area A001-b in Table 2 to 100% and 32%, respectively, the limit of the adhesive layer A001-b at the ratio of the coated area of 100% The shear stress value was about 398.3 g/cm ² , and the ultimate shear stress value at a coating area ratio of 32% was about 117.6 g/cm ² . From this experiment, it is known that the ultimate shear stress value that the adhesive layer can withstand can be reduced by reducing the coated area of the adhesive layer.

As shown in Table 2, the ultimate shear stress values of the respective adhesive layers have been obtained by the above experiment. The magnitude of the ultimate shear stress value of each adhesive layer represents: when the structural reinforcement layer of the optical disc sheet is coated with the above-mentioned adhesive layer, and the shear stress of the structural reinforcement layer is greater than the limit shear stress value, The shear stress exceeds the load of the adhesive layer, so that the structural reinforcement sheet slides relative to the adhesive layer to release the shear stress, and at the same time, the optical disk is lifted due to the sliding of the structural reinforcement sheet or Deformation of downward bending

Next, the adhesive layer A001, A003, A002, A001-a, A001-b, A004 and X001 are actually applied to the annular recording portion of the optical disc at a ratio of 100% of the coated area, and the adhesive is applied. The layer A001-b is actually applied to the annular recording portion of the optical disc at a ratio of the coated area of 32%, and the structural reinforcing sheet is attached, that is, the optical discs 12 to 19 having the structural reinforcing layer of the embodiment of the present invention are formed. The ratio of the coated area of the adhesive layer refers to the ratio of the coated area of the adhesive layer applied to the annular recording portion divided by the area of the annular recording portion. In addition, since the cost of A4 paper (70 gsm) is low and easy to obtain, this experiment selected A4 paper (70 gsm) as a structural reinforcing sheet for the optical disc. In addition, Referring to Table 3 below, Table 3 shows the linear expansion coefficients of A4 paper (70 gsm) and transparent substrate PC. The first column shows A4 paper and PC material, the second column shows the linear expansion coefficient of A4 paper and PC, and the third column. The column shows the percentage difference between the linear expansion coefficients of A4 paper and PC. It can be seen from Table 3 that the linear expansion coefficient of A4 paper (70gsm) and the linear expansion coefficient of the transparent substrate PC of the optical disc are large, and A4 paper (70gsm) is in the machine direction and vertical machine manufacturing direction. (ie, the cross-machine direction) has different linear expansion coefficients (that is, uneven deformation due to thermal expansion and contraction due to temperature changes). Therefore, in this experiment, A4 paper (70 gsm) was used as the structural reinforcement sheet. The effect of the present invention can be highlighted.

Next, the optical discs 12 to 19 which used A4 paper (70 gsm) as a structural reinforcing sheet and coated with the above-mentioned adhesive layer (100% and 32% of the coated area ratio, respectively) experienced environmental impact (ie, temperature change). In the case of 16X programming and readback function test, for example: in this experiment, the environmental impact means that the optical disc will heat up to about 50 ° C during the burning process, and will heat up during the readback process. To about 30 to 40 ° C. The burning and returning success rates of the optical disk after undergoing environmental impact are recorded in Table 4 below. Moreover, whether the programming and reading function of the optical disc is normal is determined by the programming and reading success rate shown in Table 4. In this example, the programming and reading function of the optical disc is defined as The success rate of programming and reading is more than 25%.

Table 4 shows the success rate of burning and reading after the optical discs 12 to 19 using A4 paper (70 gsm) as the structural reinforcing sheet and coated with the above-mentioned adhesive layer, wherein the first column shows the fit. The rubber layer of the glue layer, the second column shows the ratio of the coated area of the adhesive layer, the third column shows the ultimate shear stress value of the adhesive layer, and the fourth column shows the 16X programming success rate of the optical disk 12~19, and The fifth column shows the 16X readback success rate of the optical discs 12~19. As shown in Table 4, the optical discs 12-15 coated with the adhesive layers A001, A003, A002 and A001-a and having a coated area ratio of 100% are both programmed and readback after undergoing environmental impact. Normal (both firing and reading success rate is 25% or more), optical discs 16~18 coated with adhesive layers A001-b, A004 and X001 with a coated area ratio of 100% after undergoing environmental impact The programming and reading function is abnormal (the burning and reading success rate is less than 25%), and the optical disk 19 coated with the bonding adhesive layer A001-b and the coated area ratio is 32% undergoes environmental impact. After that, the programming function is normal (the burning success rate is 25% or more), but its readback function is abnormal (the readback success rate is less than 25%). Referring to the results shown in Table 4, when the limit shear stress value that the adhesive layer can withstand is about 113.8 g/cm ² or less, the structural reinforcement layer is subjected to more than 113.8 due to the displaceable property of the adhesive layer. When the shear stress is g/cm ² , the structural reinforcing sheet will slip to release the shear stress, so even if the optical disc experiences environmental impact, the correctness of the writing and reading functions can be maintained. Moreover, if the ultimate shear force value that the adhesive layer can withstand reaches 117.6 g/cm ² or more, the readback function of the optical disc cannot be used normally after undergoing temperature change. Therefore, an optical disc having a structural reinforcing layer according to an embodiment of the present invention, wherein the adhesive layer can withstand an ultimate shear value of about 113.8 g/cm ² or less.

In addition, from the experimental results of Table 2, it is known that the ultimate shear stress value of the adhesive layer can be reduced by reducing the proportion of the coated area of the adhesive layer. In summary, the present invention is to provide an optical disc having a structural reinforcing layer, wherein the product of the shear stress receiving force of the adhesive layer in the structural reinforcing layer and the ratio of the coated area thereof is less than 114 g/cm ² , that is, if When the shear stress of the adhesive layer itself is less than 114 g/cm ² , it can be applied at a ratio of 100% of the coated area. If the shear stress of the adhesive layer itself is 114 g/cm ² or more, it can pass through. The ratio of the coated area is reduced to achieve the requirement that the product of the shear stress resistance of the adhesive layer and the ratio of the coated area is less than 114 g/cm ² . Moreover, the product of the shear stress receiving force of the adhesive layer in the structural reinforcing layer of the optical disc and the ratio of the coated area thereof is less than 114 g/cm ² , that is, when the structural reinforcing layer is subjected to a shear stress of 114 g/cm ² or more, the structure The reinforcing sheet will slip to release stress. Therefore, the optical disc having the above characteristics can maintain the correctness of its burning and reading even after undergoing an environmental impact.

Figure 3 shows a schematic view of the adhesive layer applied to the structural reinforcing sheet at different coating area ratios. As shown in FIGS. 3A-3D, the adhesive layer is uniformly applied to the structural reinforcing sheet 7 in an annular manner, so that the structural reinforcing sheet 7 can be more firmly and evenly attached to the annular recording portion of the optical disc. And the proportion of the coated area of the adhesive layer is 100%, 50%, 32%, and 22%, respectively, wherein the ratio of the coated area of the adhesive layer refers to the structure reinforcement when the adhesive layer is applied. When the sheet 7 is attached to the annular recording portion of the optical disc, the ratio of the coated area of the adhesive layer on the annular recording portion divided by the area of the annular recording portion is obtained. However, the ratio of the coated area of the adhesive layer of the present invention may be any ratio as long as the product of the coated area ratio of the adhesive layer and its shear stress bearing force is less than 114 g/cm ² . However, the ratio of the coated area of the adhesive layer is preferably more than 10%, because if the ratio of the coated area is 10% or less, the adhesive layer itself can easily fall off. In addition, the adhesive layer shown in FIG. 3 is applied on the structural reinforcing sheet 7, but the adhesive layer may also be coated on the annular recording portion of the optical disc, as long as the adhesive layer can be attached to the structural reinforcing sheet. Close to the ring record department.

Another embodiment of the present invention provides a method of fabricating an optical disc having a structural reinforcement layer as described above. First, an optical disc including an annular recording portion and an annular support portion is prepared. The annular recording portion is disposed on the outer side of the annular support portion and has a thickness smaller than the thickness of the annular support portion, one side of the annular recording portion is the reading side, and the opposite side is the non-reading side. Moreover, the annular recording portion further comprises a transparent substrate and a multi-layer functional film layer, wherein the transparent substrate is on the reading side and is transparent material to provide laser penetration, and the multi-layer functional film layer is located on the transparent substrate And comprising at least one recording layer and at least one reflective layer. Next, a structural reinforcement layer is formed on the annular recording portion to reinforce the structure of the optical disk. The structural reinforcement layer comprises a structural reinforcement sheet and a bonding adhesive layer, wherein the material of the structural reinforcement sheet is different from the material of the transparent substrate of the annular recording portion, and the adhesive layer is used for bonding the structural reinforcement sheet to The annular recording portion is provided with displaceable performance, and the product of the shear stress receiving force of the adhesive layer and the ratio of the coated area is less than 114 g/cm ² , that is, when the structural reinforcing layer is subjected to 114 g/cm ² or more When the stress is sheared, the structural reinforcing sheet slides relative to the adhesive layer to release the stress and reduce the deformation of the optical disc. The ratio of the coated area of the adhesive layer means that the adhesive layer is coated on the layer. The coated area of the annular recording portion is divided by the ratio of the area of the annular recording portion.

In addition, another embodiment of the present invention provides a structural reinforcement layer for an optical disc, and the structural reinforcement layer is the same as the structural reinforcement layer of the optical disc having the structural reinforcement layer. The user can attach the structural reinforcing layer for the optical disc to the optical disc to form the optical disc having the structural reinforcing layer.

In addition, another embodiment of the present invention provides an optical disc having the adhesive layer as described above, and the user can prepare the required structural reinforcing sheet and attach the structural reinforcing sheet to the optical disc through the adhesive layer. In order to form the above-mentioned optical disc having the structural reinforcing layer, the user can customize the structural reinforcing sheet for the optical disc.

In the above embodiment, the present invention has been described using an A4 paper (70 gsm) which is inexpensive and easily available as an example of a structural reinforcing sheet, but the present invention can use any material as a structural reinforcing sheet. Moreover, when the material of the structural reinforcing sheet is different from the material of the transparent substrate of the optical disc and the difference in linear expansion coefficient between the two materials is larger, the present invention can exert its effect. For example, when a material having a linear expansion coefficient different from a linear expansion coefficient of a transparent substrate of more than 30% is used as the structural reinforcing sheet, the present invention can exert its effect.

Moreover, in the above embodiment, the structural reinforcing sheet covers the annular recording portion of the entire optical disc, but the structural reinforcing sheet may not completely cover the entire annular recording portion. For example, in order to save cost, the structural reinforcing sheet may be annular. And its inner diameter It may be greater than or equal to the outer diameter of the annular support portion, and its outer diameter may be equal to or smaller than the outer diameter of the annular recording portion, so that not only the structure of the optical disc can be enhanced, but also the optical disc can be kept stable during operation.

In the above embodiment, the sensor adhesives (A001, A003, A002, A001-a, A001-b, A004, and X001) configured by Juyi Technology Co., Ltd. are used as the adhesive layer, but the present invention is not limited to the above. And any material may be used as the adhesive layer as long as the product of the shear stress resistance of the adhesive layer and the ratio of the coated area thereof is less than 114 g/cm ² , and for example, UV hardening glue or pressure sensitive adhesive may be used. , heat hardening glue, moisture hardening glue, AB glue, or hot melt adhesive as a bonding layer.

While the invention has been described herein with reference to the preferred embodiments of the embodiments of the invention Modifications, changes, and equivalent substitutions It still falls within the scope of the patent application attached to this creation.

A‧‧‧ area

1‧‧‧DVD

2‧‧‧Ring support

3‧‧‧Actual Records Department

4‧‧‧Structural reinforcement

5‧‧‧Transparent substrate

6‧‧‧Multilayer functional film

7‧‧‧Structural reinforcement

8‧‧‧Adhesive layer

9‧‧‧ plastic tablets

10‧‧‧Adhesive layer

11‧‧‧ plastic tablets

12~19‧‧‧VCD

1A shows an optical disc having a structural reinforcing layer according to an embodiment of the present invention; FIG. 1B is an enlarged view of the annular recording portion of the optical disc of FIG. 1A; and FIGS. 2A-2C are graphs showing shear stress of various adhesive layers. Experiments on the degree of acceptance; and Figures 3A-3D show a schematic view of the adhesive layer applied to the structural reinforcement sheet at different coating area ratios.

1‧‧‧DVD

2‧‧‧Ring support

3‧‧‧Actual Records Department

4‧‧‧Structural reinforcement

5‧‧‧Transparent substrate

6‧‧‧Multilayer functional film

7‧‧‧Structural reinforcement

8‧‧‧Adhesive layer

Claims (14)

An optical disc having a structural reinforcing layer, comprising: an annular supporting portion for supporting the optical disc; an annular recording portion disposed on an outer side of the annular supporting portion, and having a thickness smaller than the annular support The thickness of the portion, the side of the annular recording portion is the reading side, and the opposite side is the non-reading side, the annular recording portion includes: a transparent substrate on the reading side, and is a transparent material Providing a laser penetration; and a multi-layer functional film layer on the transparent substrate and comprising at least one recording layer and at least one reflective layer; and a structural reinforcement layer on the multi-layer functional film layer, The structure reinforcement layer comprises: a structural reinforcement sheet, the material of which is different from the material of the transparent substrate; and a bonding adhesive layer for bonding the structural reinforcement sheet to the structure On the multi-layer functional film layer, the product of the shear stress bearing force of the adhesive layer and the ratio of the coated area is less than 114 g/cm ² , and when the structural reinforcing layer is subjected to a shear stress of 114 g/cm ² or more, the structural reinforcing sheet Producing slip, wherein the glue is applied The ratio of the coated area of the layer refers to the ratio of the coated area of the adhesive layer applied to the annular recording portion divided by the area of the annular recording portion. The optical disc having the structural reinforcing layer according to claim 1, wherein the structural reinforcing sheet has a ring shape, an inner diameter of which is greater than or equal to an outer diameter of the annular supporting portion, and an outer diameter of the outer ring is less than or equal to the ring. The outer diameter of the record section. The optical disc having the structural reinforcing layer according to claim 2, wherein the structural reinforcing sheet is paper. The optical disc having a structural reinforcing layer according to any one of claims 1 to 3, wherein the proportion of the coated area of the adhesive layer is greater than 10%. A method for manufacturing an optical disc having a structural reinforcing layer, comprising: preparing an optical disc comprising an annular recording portion and an annular supporting portion, the annular recording portion being disposed on an outer side of the annular supporting portion, and The thickness of the annular recording portion is smaller than the thickness of the annular support portion, the side of the annular recording portion is the reading side, and the opposite side is the non-reading side, wherein the annular recording portion comprises: a transparent substrate located at the reading Taking a side and providing a transparent material to provide laser penetration; and a multi-layer functional film layer on the transparent substrate and including at least one recording layer and at least one reflective layer; and forming on the annular recording portion a structural reinforcement layer for reinforcing the structure of the optical disc, wherein the structural reinforcement layer comprises: a structural reinforcement sheet having a material different from that of the transparent substrate of the annular recording portion; and a bonding layer for And attaching the structural reinforcing sheet to the annular recording portion, the product of the shear stress receiving force of the adhesive layer and the ratio of the coated area is less than 114 g/cm ² , and the structural reinforcing layer is exposed to 114 g/cm ² or more. When the shear stress is applied, the structure is added The strong film may cause slippage, wherein the ratio of the coated area of the adhesive layer refers to the ratio of the coated area of the adhesive layer applied to the annular recording portion divided by the area of the annular recording portion. . The method for manufacturing a disc having a structural reinforcing layer according to claim 5, wherein the structural reinforcing sheet has a ring shape, an inner diameter of which is greater than or equal to an outer diameter of the annular support portion, and an outer diameter of the outer diameter is less than or equal to The outer diameter of the ring record. A method of manufacturing a disc having a structural reinforcing layer according to claim 6 wherein the structural reinforcing sheet is paper. The method of manufacturing a disc having a structural reinforcing layer according to any one of claims 5 to 7, wherein the ratio of the coated area of the adhesive layer is greater than 10%. A structural reinforcing layer for an optical disc for attaching to the optical disc to strengthen the structure thereof, comprising: a structural reinforcing sheet, the material of which is different from the material of the transparent substrate of the optical disc; and a bonding layer The structural reinforcing sheet is attached to the recording portion of the optical disc, and the product of the shear stress receiving force of the adhesive layer and the ratio of the coated area is less than 114 g/cm ² , and the structural reinforcing layer is subjected to 114 g/ When the shear stress is above cm ² , the structural reinforcing sheet may be slipped, wherein the ratio of the coated area of the adhesive layer refers to the coated area of the adhesive layer applied to the recording portion divided by The ratio of the area of the record department. The structural reinforcement layer for an optical disc of claim 9, wherein the structural reinforcement sheet is annular, the inner diameter of which is greater than or equal to the inner diameter of the optical disc, and the outer diameter of which is less than or equal to the outer diameter of the optical disc. . A structural reinforcement layer for an optical disc according to claim 10, wherein the structural reinforcement sheet is paper. The structural reinforcement layer for an optical disk according to any one of claims 9 to 11, wherein the coated area of the adhesive layer is greater than 10%. An optical disc having a laminated adhesive layer, wherein the thickness of the recording portion of the optical disc is smaller than the thickness of the supporting portion, the adhesive layer is coated on the recording portion of the optical disc, and the adhesive layer is cut The product of the stress withstand ratio and the ratio of the coated area is less than 114 g/cm ² , wherein the ratio of the coated area of the adhesive layer refers to the coated area of the adhesive layer applied to the recording portion divided by the record. The ratio of the area of the department. The optical disc having the adhesive layer as described in claim 13 wherein the ratio of the coated area of the adhesive layer is greater than 10%.