Manufacturing method and manufacturing device for high-capacity optical disc
By injecting pressurized air into the optical disk substrate during the optical disk manufacturing process, the problem of difficult control of the warpage of the optical disk substrate in traditional processes is solved, and high-quality high-capacity optical disk manufacturing is achieved.
Patent Information
- Application Number
- CN202411771162.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-03-25
AI Technical Summary
When manufacturing high-capacity optical discs, traditional processes are difficult to effectively control the warpage of the optical disc substrate, resulting in poor quality of the optical disc.
By injecting pressurized air into the space between the lower surface of the optical disc substrate and the bottom surface of the cavity of the turntable during UV hardening, deformation in the direction of gravity caused by self-weight or internal stress of the optical disc substrate is corrected.
The warpage of the optical disc substrate is effectively controlled, the quality of the optical disc is improved, and the bonding quality is ensured during the double-sided manufacturing process of the optical disc.
Smart Images
Figure CN119694355A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of optical disc manufacturing, and in particular to a manufacturing method and a manufacturing device for high-capacity optical discs. Background Art
[0002] In terms of increasing the capacity of optical discs, the recording capacity of each disc is increased by multi-layering of information layers. There are generally two methods for multi-layering: one is to increase the number of stacked layers, and the other is to glue the backs of the stacked single-sided disc substrates together to achieve double-sided.
[0003] Although these two methods are used in optical discs with a higher capacity than Blu-ray Discs (archive discs, but not limited to archive discs), there are still various manufacturing problems in making the optical discs double-sided after lamination.
[0004] Specifically, in order to manufacture a high-capacity optical disc (archive optical disc, but not limited to archive optical disc) exceeding the capacity of a Blu-ray disc, it is necessary to paste the high-capacity optical discs back to back. In the optical disc pasting technology represented by DVD so far, the technology described in the prior patent is proposed. Prior patent, patent application publication number: JPH09180267A; patent name: Optical disc manufacturing and manufacturing device thereof.
[0005] However, since high-capacity optical discs have multiple recording films and UV resin layers stacked on a thin substrate, the stress applied to the substrate before bonding is very large. In traditional processes, it is very difficult to control the bonding within the specified warpage range. Summary of the invention
[0006] The present invention aims at solving the above problems and proposes a method for manufacturing a high-capacity optical disc.
[0007] The technical means adopted by the present invention are as follows:
[0008] A method for manufacturing high-capacity optical discs includes placing two optical disc substrates bonded by UV adhesive in a turntable for UV curing, and also includes the following steps: while the turntable rotates and the UV adhesive is UV cured, pressurized air is injected into the space between the lower surface of the optical disc substrate and the bottom surface of the cavity of the turntable to correct the deformation of the optical disc substrate in the direction of gravity caused by its own weight or internal stress.
[0009] Furthermore, by injecting pressurized air into the space between the lower surface of the optical disc substrate and the bottom surface of the cavity of the turntable, the outer periphery of the optical disc is lifted during the correction process.
[0010] Furthermore, the method further includes adjusting the flow rate and / or air pressure of the pressurized air to adjust the correction amount of the optical disc substrate by the pressurized air;
[0011] The air pressure of the pressurized air is adjusted by a pressure reducing valve, and the flow rate is adjusted by a flow regulating valve.
[0012] Furthermore, the method further includes measuring the warpage of the optical disc substrate after UV curing, and adjusting the flow rate and / or air pressure of the pressurized air according to the obtained warpage value.
[0013] Furthermore, during the UV curing process, pressurized air is continuously injected into the space between the lower surface of the optical disc substrate and the bottom surface of the cavity of the turntable.
[0014] A manufacturing device used in the manufacturing method for high-capacity optical discs described in the present application, comprising a turntable and a UV emitting device, wherein the UV emitting device is arranged outside the turntable;
[0015] The turntable comprises a rotating platform, a disc holding component, a disc limiting pin and an upper cover plate;
[0016] The rotating table is provided with a disc accommodating cavity, the disc holding component is placed in the disc accommodating cavity to support the central supporting area of the disc substrate, the disc limiting pin is placed in the disc accommodating cavity to be inserted into the central hole of the disc substrate to limit the radial movement of the disc substrate, and the upper cover plate can be buckled on the rotating table;
[0017] It also includes a pressurized air circuit arranged on the rotating table, which can inject pressurized air into the space between the lower surface of the optical disc substrate placed in the optical disc accommodating cavity and the bottom surface of the cavity of the turntable to correct the deformation of the optical disc substrate in the direction of gravity caused by its own weight or internal stress.
[0018] Furthermore, the optical disk holding component is made of elastically deformable material.
[0019] Furthermore, the optical disc holding component is made of silicone material.
[0020] Furthermore, the upper cover includes an upper cover holding portion and an upper cover body, wherein the upper cover holding portion is used to support the upper side of the central supporting area of the optical disc substrate, so that the upper cover body and the upper side of the optical disc substrate form a correction space.
[0021] Furthermore, the contact area between the optical disc holding component and the central supporting area of the optical disc substrate is larger than the contact area between the upper cover plate holding portion and the central supporting area of the optical disc substrate, so that when the upper cover plate is buckled onto the optical disc substrate located on the optical disc holding component, the optical disc holding component undergoes elastic deformation and generates a corrective force on the optical disc substrate.
[0022] Compared with the prior art, the manufacturing method for high-capacity optical discs disclosed in the present invention has the following beneficial effects: since pressurized air is injected into the space between the lower surface of the optical disc substrate and the bottom surface of the cavity of the turntable during the process of placing two optical disc substrates bonded by UV adhesive on a turntable for UV curing, the pressurized air can be used to correct the deformation of the optical disc substrate in the direction of gravity caused by its own weight or internal stress, thereby effectively controlling the warping of the optical disc substrate after bonding within a specified range, thereby ensuring the quality of the optical disc. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a schematic diagram of the structure of a double-sided high-capacity optical disc;
[0024] Figure 2 A schematic diagram of the manufacturing process of a double-sided high-capacity optical disc;
[0025] Figure 3 This is a structural diagram of a UV curing device for double-sided high-capacity optical discs in this application;
[0026] Figure 4 A structural diagram of a turntable used in a double-sided high-capacity optical disc UV curing device in this application;
[0027] Figure 5 A schematic diagram of an embodiment of providing a pressurized air circuit in a turntable in the present application;
[0028] Figure 6 This is a schematic diagram of the force applied to the optical disc substrate when the optical disc holding component in the present application is made of elastic material.
[0029] In the figure: 1. turntable; 10. rotating table; 100. optical disc accommodating cavity; 101. space between the lower surface of the optical disc substrate and the bottom surface of the cavity of the turntable; 102. correction space; 103. gap; 11. optical disc holding component; 12. optical disc limit pin; 13. upper cover; 130. upper cover holding portion; 131. upper cover body; 14. pressurized air path; 140. air outlet; 141. air inlet; 2. UV emitting device; 3. optical disc substrate; 30. central supporting area of the optical disc substrate; 31. central hole of the optical disc substrate. DETAILED DESCRIPTION
[0030] A method for manufacturing high-capacity optical discs includes placing two optical disc substrates bonded by UV adhesive in a turntable for UV curing, and also includes the following steps: while the turntable rotates and the UV adhesive is UV cured, pressurized air is injected into the space between the lower surface of the optical disc substrate and the bottom surface of the cavity of the turntable to correct the deformation of the optical disc substrate in the direction of gravity caused by its own weight or internal stress.
[0031] Specifically, Figure 1 and Figure 2 The double-sided high-capacity optical disc structure in the present application is shown, which includes an optical disc substrate 1 and an optical disc substrate 2. The optical disc substrate 1 and the optical disc substrate 2 have the same structure, including a forming substrate, a multi-layer recording layer, a multi-layer intermediate layer and a protective layer. The thickness of the forming substrate is generally about 0.5 mm. The recording layer and the intermediate layer are arranged at intervals on one side of the forming substrate. The outermost layer of the forming substrate is provided with a protective layer. The intermediate layer and the protective layer are generally formed by a UV resin layer of tens of microns. The recording layer is generally tens of nanometers thick. The backs of the optical disc substrate 1 and the optical disc substrate 2 are bonded together by UV adhesive to form a double-sided optical disc. The thickness of the formed double-sided optical disc is about 1.2 mm. In the process of bonding the optical disc substrate 1 and the optical disc substrate 2 to each other by UV adhesive, it is necessary to evenly apply UV resin glue on the back of the forming substrate of the optical disc substrate 1 and / or the optical disc substrate 2, and then the backs of the forming substrates of the optical disc substrate 1 and the optical disc substrate 2 are bonded and placed in a turntable. The turntable drives the optical disc substrate to rotate and perform UV curing.
[0032] like Figure 3 As shown, the turntable 1 for UV curing the optical disc substrate comprises a rotating table 10, an optical disc holding component 11, an optical disc limiting pin 12 and an upper cover plate 13;
[0033] A disc accommodating cavity 100 is provided in the turntable 10, a disc holding component 11 is disposed in the disc accommodating cavity 100 for supporting the central supporting area 30 of the disc substrate, a disc limiting pin 12 is disposed in the disc accommodating cavity 100 for inserting into the central hole 31 of the disc substrate to limit the radial movement of the disc substrate 3, and an upper cover plate 13 can be buckled onto the turntable 10; a UV emitting device 2 is provided on the outer side (upper and lower sides) of the turntable 1.
[0034] like Figure 3 As shown, the optical disc substrate 3 (the optical disc substrate 1 and the optical disc substrate 2 bonded by UV adhesive) is placed in the optical disc accommodating cavity 100 of the rotating table 10, the optical disc holding component 11 supports the central supporting area 30 of the optical disc substrate, the optical disc limiting pin 12 is inserted into the central hole 31 of the optical disc substrate to limit the radial movement of the optical disc substrate 3, the upper cover plate 13 is buckled on the rotating table 10, and the central supporting area 30 of the optical disc substrate is supported by the optical disc holding component 11, so that the disc surface of the optical disc substrate is suspended in the optical disc accommodating cavity 100. During the UV curing process of the UV adhesive, the turntable 1 drives the optical disc substrate 3 to rotate, and the UV emitting device 2 injects UV light into the turntable 1 to gradually harden the UV adhesive. However, since the disc surface of the optical disc substrate 3 is suspended in the optical disc accommodating cavity 100, the disc surface of the optical disc substrate 3 will be deformed in the direction of gravity due to factors such as gravity and internal stress, thereby increasing the warping degree of the optical disc substrate after molding, affecting the quality of the optical disc.
[0035] In the present application, during the rotation of the turntable 1 and the UV adhesive is UV-cured, pressurized air is also injected into the space 101 between the lower surface of the optical disc substrate and the bottom surface of the cavity of the turntable to correct the deformation of the optical disc substrate in the direction of gravity due to its own weight or internal stress. That is, in the present application, during the rotation of the turntable 1 and the UV adhesive is UV-cured, pressurized air is injected into the space 101 between the lower surface of the optical disc substrate and the bottom surface of the cavity of the turntable, and the pressurized air acts on the lower surface of the optical disc substrate, thereby lifting the disc surface of the optical disc substrate 3 upward, thereby eliminating or reducing the deformation of the disc surface of the optical disc substrate in the direction of gravity caused by factors such as gravity and internal stress, thereby eliminating or reducing the warping of the optical disc substrate after molding, and improving the quality of the optical disc.
[0036] Furthermore, by injecting pressurized air into the space between the lower surface of the optical disc substrate and the bottom surface of the cavity of the turntable, the outer periphery of the optical disc substrate is lifted during the correction process.
[0037] Specifically, a certain gap 103 is left between the outer edge of the optical disc substrate and the inner wall surface of the turntable, so that the pressurized air enters the space 101 between the lower surface of the optical disc substrate and the bottom surface of the cavity of the turntable and is discharged from the gap 103, so that the pressurized air can effectively lift the outer periphery of the optical disc substrate, thereby eliminating or reducing the deformation of the optical disc surface in the direction of gravity caused by factors such as gravity and internal stress, thereby eliminating or reducing the warping of the optical disc substrate after molding, and improving the quality of the optical disc.
[0038] Furthermore, the method further includes adjusting the flow rate and / or air pressure of the pressurized air to adjust the correction amount of the optical disc substrate by the pressurized air;
[0039] Among them, the pressure of the pressurized air is adjusted by a pressure reducing valve, and the flow rate is adjusted by a flow regulating valve.
[0040] Specifically, when the pressurized air is injected into the space between the lower surface of the optical disc substrate and the bottom surface of the cavity of the turntable, the flow rate and / or air pressure of the pressurized air can also be adjusted to adjust the correction amount of the optical disc substrate by the pressurized air. That is, during the rotation of the turntable and UV curing of the UV adhesive, the deformation of the optical disc substrate in the direction of gravity due to factors such as gravity and internal stress can be monitored in real time, and the flow rate and / or air pressure of the pressurized air can be adjusted in real time to adjust the correction amount of the optical disc substrate by the pressurized air, thereby improving the quality of the optical disc after molding. It is also possible to adjust the flow rate and / or air pressure of each batch of pressurized air when UV curing is performed on different batches of optical disc substrates, so that the adjusted pressurized air can meet the warpage requirements of the optical disc substrates after molding of the batch, thereby ensuring the consistency of the product and avoiding the increase in system complexity and cost caused by the increase in the implementation of monitoring equipment.
[0041] Furthermore, the method further includes measuring the warpage of the optical disc substrate after UV curing, and adjusting the flow rate and / or air pressure of the pressurized air according to the obtained warpage value.
[0042] Specifically, during the UV curing process of the same batch of optical disc substrates, the flow rate and / or air pressure of the pressurized air can be preliminarily set based on empirical data or test data, and then the optical disc substrates (test pieces or the first few) can be UV cured, and the warping of the optical disc substrates that have completed UV curing can be measured, and the flow rate and / or air pressure of the pressurized air can be adjusted according to the obtained warping value, so that the set flow rate and / or air pressure of the pressurized air can meet the warping requirements of the optical disc substrates after the batch is formed, thereby ensuring the consistency of the products and avoiding the increase in system complexity and cost caused by adding monitoring equipment.
[0043] Furthermore, during the UV curing process, pressurized air is continuously injected into the space between the lower surface of the optical disc substrate and the bottom surface of the cavity of the turntable.
[0044] Specifically, during the UV curing process, pressurized air is continuously injected into the space between the lower surface of the optical disc substrate and the bottom surface of the turntable cavity, so that the pressurized air can continuously exert force on the surface of the optical disc substrate, thereby eliminating or reducing the deformation of the surface of the optical disc substrate in the direction of gravity due to factors such as gravity and internal stress, thereby eliminating or reducing the warping of the optical disc substrate after molding and improving the quality of the optical disc.
[0045] like Figure 3 and Figure 4 The present invention discloses a manufacturing device for UV curing of high-capacity optical discs, which includes a turntable 1 and a UV emitting device 2, wherein the UV emitting device 2 is arranged outside the turntable 1;
[0046] The turntable 1 comprises a rotating platform 10, a disc holding component 11, a disc limiting pin 12 and an upper cover plate 13;
[0047] The rotating table 10 is provided with a disc accommodating cavity 100, the disc holding component 11 is disposed in the disc accommodating cavity 100 to support the central supporting area 30 of the disc substrate, the disc limiting pin 12 is disposed in the disc accommodating cavity 100 to be inserted into the central hole 31 of the disc substrate to limit the radial movement of the disc substrate, and the upper cover plate 13 can be buckled on the rotating table 10;
[0048] It also includes a pressurized air circuit 14 arranged on the rotating table 10, which can inject pressurized air into the space 101 between the lower surface of the optical disc substrate placed in the optical disc accommodating cavity and the bottom surface of the cavity of the turntable to correct the deformation of the optical disc substrate in the direction of gravity caused by its own weight or internal stress.
[0049] Specifically, Figure 3 As shown, the turntable 1 for UV curing the optical disc substrate 3 comprises a rotating table 10, an optical disc holding component 11, an optical disc limiting pin 12 and an upper cover plate 13;
[0050] A disc accommodating cavity 100 is provided in the turntable 10, and a pressurized air path 14 is provided in the turntable 10. The outer side of the pressurized air path 14 is connected to a pressurized air source. An air outlet 140 of the pressurized air path 14 is located in a space 101 between the lower surface of the disc substrate and the bottom surface of the cavity of the turntable (when the disc substrate is installed in the turntable). The pressurized air source can inject pressurized air of a certain pressure and / or flow rate into the space between the lower surface of the disc substrate and the bottom surface of the cavity of the turntable through the pressurized air path. A disc holding component 11 is disposed in the disc accommodating cavity 100 to support the central supporting area 30 of the disc substrate. A disc limit pin 12 is disposed in the disc accommodating cavity 100 to be inserted into the central hole 31 of the disc substrate to limit the radial movement of the disc substrate 3. The upper cover plate 13 can be snapped onto the turntable 10. A UV emitter 2 is provided on the outer side (upper and lower sides) of the turntable 1.
[0051] like Figure 3 As shown, when the device disclosed in the present application is used to UV harden the optical disc substrate, the optical disc substrate 3 (the optical disc substrate 1 and the optical disc substrate 2 bonded by the UV adhesive) is placed in the optical disc receiving cavity 100 of the rotating table 10, the optical disc holding component 11 supports the central supporting area 30 of the optical disc substrate, the optical disc limiting pin 12 is inserted into the central hole 31 of the optical disc substrate to limit the radial movement of the optical disc substrate 3, the upper cover plate 13 is buckled on the rotating table 10, and the central supporting area 30 of the optical disc substrate is supported by the optical disc holding component 11, so that the disc surface of the optical disc substrate 3 is suspended in the optical disc receiving cavity 100. During the UV curing process of the UV adhesive, the turntable 1 drives the optical disc substrate 3 to rotate. At the same time, the pressurized air source injects pressurized air of a certain pressure and / or flow rate into the space 101 between the lower surface of the optical disc substrate and the bottom surface of the turntable cavity through the pressurized air path. The pressurized air acts on the lower surface of the optical disc substrate 3, thereby lifting the disc surface of the optical disc substrate 3 upward, thereby eliminating or reducing the deformation of the disc surface of the optical disc substrate in the direction of gravity caused by factors such as gravity and internal stress, thereby eliminating or reducing the warping of the optical disc substrate after molding, and improving the quality of the optical disc. In this application, if Figure 5As shown, the pressurized air path 14 can be arranged on the side wall of the rotating table 10, an annular channel is machined inside the side wall, a plurality of air outlets 140 are evenly distributed on the inner side of the side wall, and an air inlet 141 connected to the air source is arranged on the outer side of the side wall. The pressurized air path can also be arranged on the bottom wall of the rotating table, an annular channel is machined inside the bottom wall, a plurality of air outlets are evenly distributed on the inner side of the bottom wall, and an air inlet connected to the air source is arranged on the outer side of the bottom wall.
[0052] Furthermore, the optical disk holding component is made of elastically deformable material.
[0053] Specifically, Figure 6 As shown, in the present embodiment, the optical disc holding component 11 is made of an elastic deformable material, so that after the optical disc substrate 3 is placed on the optical disc holding component 11 and pressed by the upper cover plate 13, the optical disc holding component 11 will produce a certain deformation due to the pressure of the upper cover 13, thereby generating an upward corrective force on the optical disc substrate 3, thereby further reducing the deformation of the optical disc substrate surface in the direction of gravity caused by factors such as gravity and internal stress.
[0054] Furthermore, the optical disc holding component is made of silicone material.
[0055] Specifically, in this embodiment, the optical disk holding component 11 is made of silicone material.
[0056] Furthermore, the upper cover includes an upper cover holding portion and an upper cover body, wherein the upper cover holding portion is used to support the upper side of the central supporting area of the optical disc substrate, so that the upper cover body and the upper side of the optical disc substrate form a correction space.
[0057] Specifically, in the present embodiment, the upper cover 13 includes an upper cover retaining portion 130 and an upper cover body 131. The upper cover retaining portion 130 is an annular protruding structure arranged at the center of the lower side surface of the upper cover body 131. When the upper cover 13 is buckled in the rotating table 10, the upper cover retaining portion 130 is supported on the upper side of the central supporting area 30 of the optical disc substrate, so that the upper cover body 131 and the upper side of the optical disc substrate 3 form a correction space 102. The formation of the correction space 102 by the upper cover body 131 and the upper side of the optical disc substrate 3 can ensure that when pressurized air acts on the lower surface of the optical disc substrate, the pressurized air lifts the disc surface of the optical disc substrate upward, thereby eliminating or reducing the deformation of the disc surface of the optical disc substrate in the direction of gravity due to factors such as gravity and internal stress, thereby eliminating or reducing the warping of the optical disc substrate after molding, thereby improving the quality of the optical disc.
[0058] Furthermore, the contact area between the optical disc holding component and the central supporting area of the optical disc substrate is larger than the contact area between the upper cover plate holding portion and the central supporting area of the optical disc substrate, so that when the upper cover plate is buckled onto the optical disc substrate located on the optical disc holding component, the optical disc holding component undergoes elastic deformation and generates a corrective force on the optical disc substrate.
[0059] Specifically, in the present embodiment, the contact area between the optical disc holding component and the central supporting area of the optical disc substrate is larger than the contact area between the upper cover plate holding portion and the central supporting area of the optical disc substrate, so that when the upper cover plate is buckled onto the optical disc substrate located on the optical disc holding component, the optical disc holding component is elastically deformed and generates a corrective force on the optical disc substrate, thereby further reducing the deformation of the optical disc surface in the direction of gravity caused by factors such as gravity and internal stress.
[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A method for manufacturing a high-capacity optical disc, comprising placing two optical disc substrates bonded by a UV adhesive in a turntable for UV curing, characterized in that: The following steps are also included: During the process of the turntable rotating and UV curing the UV adhesive, pressurized air is injected into the space between the lower surface of the optical disc substrate and the bottom surface of the cavity of the turntable to correct the deformation of the optical disc substrate in the direction of gravity due to its own weight or internal stress.
2. The method for manufacturing a high-capacity optical disc according to claim 1, characterized in that: By injecting pressurized air into the space between the lower surface of the optical disc substrate and the bottom surface of the cavity of the turntable, the outer periphery of the optical disc substrate is lifted during the correction process.
3. The method for manufacturing a high-capacity optical disc according to claim 2, characterized in that: The method further comprises adjusting the flow rate and / or air pressure of the pressurized air to adjust the correction amount of the optical disc substrate by the pressurized air; The air pressure of the pressurized air is adjusted by a pressure reducing valve, and the flow rate is adjusted by a flow regulating valve.
4. The method for manufacturing a high-capacity optical disc according to claim 3, characterized in that: The method also includes measuring the warpage of the optical disc substrate after UV curing, and adjusting the flow rate and / or air pressure of the pressurized air according to the warpage value obtained.
5. The method for manufacturing a high-capacity optical disc according to claim 1, characterized in that: During the UV curing process, pressurized air is continuously injected into the space between the lower surface of the optical disc substrate and the bottom surface of the cavity of the turntable.
6. A manufacturing device for the method for manufacturing a high-capacity optical disc according to any one of claims 1 to 5, characterized in that: It includes a rotating disk and a UV emitting device, wherein the UV emitting device is arranged outside the rotating disk; The turntable comprises a rotating platform, a disc holding component, a disc limiting pin and an upper cover plate; The rotating table is provided with a disc accommodating cavity, the disc holding component is placed in the disc accommodating cavity to support the central supporting area of the disc substrate, the disc limiting pin is placed in the disc accommodating cavity to be inserted into the central hole of the disc substrate to limit the radial movement of the disc substrate, and the upper cover plate can be buckled on the rotating table; It also includes a pressurized air circuit arranged on the rotating table, which can inject pressurized air into the space between the lower surface of the optical disc substrate placed in the optical disc accommodating cavity and the bottom surface of the cavity of the turntable to correct the deformation of the optical disc substrate in the direction of gravity caused by its own weight or internal stress.
7. The manufacturing device according to claim 6, characterized in that: The optical disk holding component is made of elastically deformable material.
8. The manufacturing device according to claim 7, characterized in that: The optical disc holding component is made of silicone material.
9. The manufacturing device according to any one of claims 6 to 8, characterized in that: The upper cover plate comprises an upper cover plate holding portion and an upper cover plate body, wherein the upper cover plate holding portion is used to support the upper side of the central supporting area of the optical disc substrate, so that the upper cover plate body and the upper side of the optical disc substrate form a correction space.
10. The manufacturing device according to claim 9, characterized in that: The contact area between the optical disc holding component and the central supporting area of the optical disc substrate is larger than the contact area between the upper cover plate holding portion and the central supporting area of the optical disc substrate, so that when the upper cover plate is buckled onto the optical disc substrate located on the optical disc holding component, the optical disc holding component produces elastic deformation and generates a corrective force on the optical disc substrate.