TWI427632B - Method of making of cover layer of optical recording media and irradiating device is used therein - Google Patents

Description

Method for manufacturing optical recording medium cover layer and illumination device used in the method

The invention relates to a method for manufacturing an optical recording medium covering layer and an irradiation device used in the method, in particular to a simple processing, which can uniformly distribute the liquid resin glue on the second surface of the transparent substrate of the optical recording medium. A layer manufacturing method and an irradiation apparatus used in the method.

As shown in Figures 1 to 4, the structure of a conventional blue light optical recording medium mainly comprises a transparent substrate 1, a film layer stacking structure 2 and a cover layer 3; wherein the transparent substrate 1 has a central hole 11; The film layer stack structure 2 is deposited on a surface of one side of the transparent substrate 1 between the outer side of the center hole 11 and the outer edge of the transparent substrate 1; and the conventional cover layer process system is to form the liquid resin glue of the cover layer 3. 31 is applied to the transparent substrate 1 at a position on the side of the film layer stack structure 2 close to the center hole 11, and then the transparent substrate 1 is rotated at a high speed, and the liquid resin glue 31 is diffused to the outer periphery by the centrifugal force generated by the rotation and covers the transparent substrate. 1 and the surface of the film stack structure 2. Finally, the UV light irradiation device 4 is irradiated (as shown in FIG. 3), and after the liquid resin glue 31 is cured, a light-permeable cover layer 3 can be formed on the surface of the film layer stack structure 2 (as shown in FIG. 4). Shown).

However, due to factors that are difficult to control due to the centrifugal force, the above-mentioned conventional process liquid resin adhesive 31 exhibits a thin outer thickness and a thickness distribution of the edge protrusions 32 (as shown in FIG. 2), thereby affecting the formation after curing. The optical properties of the cover layer 3. In order to avoid the lack of conventional processes, there is an improved process. As shown in Figure 3, the multiple systems are first placed with a cap. Above the center of the film stack structure 2, the liquid resin glue 31 is dropped on the periphery of the cap 4 to form an annular apron, and then the transparent substrate 1 is rotated at a high speed to spread the liquid resin glue 31 outward. . After the spin coating is completed, the cap 4 is removed, and then irradiated with a UV light irradiation device to cure the liquid resin adhesive 2, so that a uniform thickness and a light can be formed on the surface of the transparent substrate 1 and the film stack structure 2. The cover layer 3 is penetrated to effectively improve the lack of thickness unevenness of the conventional process layer distribution.

However, after field verification, the above improved process has not been perfected, and still has the following shortcomings:

1. As shown in Fig. 3, the coating process using the cap 4 is repeatedly repeated during the process, which causes the life of the cap 4 to be reduced, so that it needs to be updated frequently to increase the production cost. .

2. The coating process using the cap 4 is difficult to control because the process steps are complicated.

In view of the fact that there are many defects in the process of coating the optical recording medium, the inventor of this case is the research and improvement of the burning paste, and the invention is finally produced.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a method for fabricating an optical recording medium cover layer which is easy to process, in addition to improving the uneven distribution of liquid resin glue in the conventional process, and also avoids the problem of increased cost of the improved process.

Another object of the present invention is to provide an illumination apparatus used in a method of manufacturing an optical recording medium cover layer, which can change the illumination range of the UV light source by controlling the change of the aperture mechanism. To improve the optical flaw of the cover layer.

In order to achieve the above object and effect, the transparent substrate used in the present invention is provided with an annular groove on the outer surface of the outer edge of the center hole, and a film layer stack structure is deposited on the same side surface of the annular groove; The surface of the transparent substrate deposited by the deposition is from the outer edge of the annular groove, but slightly smaller than the outer edge of the transparent substrate; and a UV light irradiation device having an automatic control aperture mechanism to control the range of the UV light irradiation.

The process steps adopted by the present invention include: a "substrate preparation" step of placing a transparent substrate deposited with a layer stack structure side up in a liquid resin glue coating device, waiting for a subsequent step; "spin coating" In the step of slowly rotating the transparent substrate with the center hole as the axis, the liquid resin glue is dropped into the annular groove along the outer edge of the annular groove, so that the liquid resin glue flows to form an annular glue. The "rotating coating and solidifying" step is such that the transparent substrate is rotated at a high speed with the center hole as an axis, and the liquid resin glue is diffused toward the outer edge of the transparent substrate by centrifugal force, and a UV irradiation device with an automatic control aperture mechanism is used. The irradiation range of the control UV light source is gradually increased with the diffusion rate of the liquid resin glue, so as to maintain the thickness of the liquid resin glue uniformly covering the transparent substrate and the surface of the film layer stack deposited thereon.

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As shown in FIGS. 5a and 5b, the transparent substrate 1 of the present invention has a center in the center. The hole 11 is provided with an annular groove 12 on the outer edge of the central hole 11, and the transparent substrate 1 has a film layer stack structure 2 deposited on the side of the annular groove 12; the film layer stack structure 2 is deposited and covered. The surface of the transparent substrate 1 is from the outer edge of the annular groove 12, but is slightly smaller than the outer edge of the transparent substrate 1.

Further, as shown in FIG. 6, the UV light irradiation device 5 includes a UV light source conduit 51, a UV light source and power supply device 52, and an aperture mechanism 53; the UV light irradiation device 5 is UV The light source conduit 51 conducts the UV light source and the UV light generated by the power supply device 52 to the aperture mechanism 53, and uses it as a mask to control the irradiation range of the UV light; as shown in Fig. 8, the aperture of the aperture mechanism 53 It may be a circular shape or other shape, and may be accompanied by an optical element such as a lens, and further connected to the automatic control system, so that the aperture mechanism 53 can change the aperture with the diffusion rate of the liquid resin glue 31; in addition, the aperture mechanism 53 It can be operated at a fixed position or moved in one dimension while operating to achieve optimal light intensity control.

The process of the present invention comprises the following steps: a "substrate preparation" step, as shown in Fig. 7a, a transparent substrate 1 in which a transparent substrate 1 is deposited with a transparent substrate 1 of a film layer stack structure 2, which is formed on the periphery of a central hole 11 of a sputter-stacked data structure. One of the annular grooves 12 is disposed face up in the liquid resin glue 31 coating device, waiting for the subsequent step; the "spin coating" step, as shown in Fig. 7b, with the center hole 11 as the axis The transparent resin substrate 31 is slowly rotated, and the liquid resin glue 31 is dropped on the outer side of the annular groove 12 along the outer edge of the annular groove 12, and the liquid resin glue 31 is brought into contact with the annular groove. The outer edge of the groove 12 forms an annular adhesive apron; the "spin coating and solidification" step, as shown in Figures 7c to 7f, causes the transparent substrate 1 to rotate at a high speed centering on the center hole 11, and the centrifugal force is used to make the transparent substrate 1 The liquid resin glue 31 spreads outward while The UV light irradiation device 5 (shown in FIG. 6) with the aperture mechanism 53 that automatically controls the interlocking is used to change the intensity of the light source, thereby controlling the irradiation range of the UV light source to gradually increase with the diffusion rate of the liquid resin glue 31. The liquid resin glue 31 is slowly solidified outwardly from the center hole 11 of the transparent substrate 1 while flowing, so that the liquid resin glue 31 is uniformly distributed in thickness on the surface of the film layer stack 2 of the transparent substrate 1, and It is not caused by the excessive throwing of the centrifugal force, and the thickness distribution of the inner and outer thickness is generated; after the liquid resin glue 31 is completely dried, a uniform distribution can be formed on the surface of the film stack structure 2 of the transparent substrate 1. The light penetrates the cover layer 3 (as shown in Figure 7f).

As can be seen from the above, the method for producing a cover layer of the present invention has the advantages of long service life, good product appearance, and uniform control of the thickness of the cover layer, and indeed has industrial mass production usability.

The above-mentioned embodiments are only intended to illustrate the technical features and effects of the present invention, and are not intended to limit the scope of the patents of the present invention, and those skilled in the art are entitled to the above description and the scope of the following claims. Variations or modifications of the features and equivalents in terms of their efficiencies are intended to be included within the scope of the present invention.

1‧‧‧Transparent substrate

11‧‧‧ center hole

12‧‧‧Round groove

2‧‧‧ film stack structure

3‧‧‧ Coverage

31‧‧‧Liquid resin glue

32‧‧‧Edge protrusion

4‧‧‧caps

5‧‧‧UV light irradiation device

51‧‧‧UV light source conduit

52‧‧‧UV light source and power supply

53‧‧‧ aperture mechanism

Figure 1: Schematic diagram of the cross-sectional structure of a conventional optical recording medium.

Fig. 2 is a schematic view showing a state in which a liquid resin paste is applied to an optical recording medium substrate by a conventional centrifugal force process.

Figure 3: Schematic diagram of the structure of the device used in the process of the optical recording medium overlay.

Figure 4: Schematic diagram of the optical recording medium overlay produced by the conventional optical recording medium overlay process.

Fig. 5a is a cross-sectional view showing the structure of a transparent substrate of the present invention.

Figure 5b is an enlarged partial cross-sectional view showing the structure of the transparent substrate of the present invention.

Figure 6 is a schematic view showing the structure of an irradiation apparatus used in the present invention.

Figure 7a is a schematic view of the substrate standby preparation of the manufacturing method of the present invention.

Figure 7b is a schematic view of the spin coating step of the manufacturing method of the present invention.

Figure 7c: One of the schematic diagrams of the spin coating and curing steps of the manufacturing method of the present invention.

Figure 7d is a schematic view of the spin coating and curing steps of the manufacturing method of the present invention.

Figure 7e is a third schematic view of the spin coating and curing steps of the manufacturing method of the present invention.

Figure 7f is a fourth schematic view of the spin coating and curing steps of the manufacturing method of the present invention.

Figure 8 is a schematic view of the aperture mechanism of the present invention.

1‧‧‧Transparent substrate

11‧‧‧ center hole

12‧‧‧Round groove

2‧‧‧ film stack structure

3‧‧‧ Coverage

31‧‧‧Liquid resin glue

5‧‧‧UV light irradiation device

51‧‧‧UV light source conduit

53‧‧‧ aperture mechanism

Claims (5)

A method for manufacturing an optical recording medium cover layer, comprising the steps of: a "substrate preparation" step of depositing a transparent substrate on which a film layer is stacked, and providing an annular groove around a center hole of a side of the sputter deposition data structure; One side is placed in a liquid resin glue coating device for standby coating; a "spin coating" step, the transparent substrate is slowly rotated with the center hole as the axis, and the liquid resin glue is along the annular groove The outer edge is dropped on the outer side of the annular groove, and the liquid resin glue flows into contact with the outer edge of the annular groove to form a ring-shaped adhesive apron; a "spin coating and curing" step is The transparent substrate is rotated at a high speed centering on the center hole, and the liquid resin glue is diffused toward the outer edge of the substrate by centrifugal force, and the UV light irradiation device with the aperture mechanism automatically controlling the linkage is used to change the intensity of the light source, thereby controlling the UV light irradiation. The range gradually increases with the diffusion rate of the liquid resin glue, so that the liquid resin glue can be slowly diffused outward by the center hole position of the transparent substrate while flowing, so that the liquid tree The grease maintains a uniform thickness distributed on the surface of the film stack structure of the transparent substrate. A UV light irradiation device comprises a UV light source conduit, a UV light source and a power supply device and an aperture mechanism; wherein the UV light illumination device transmits UV light generated by the UV light source and the power supply device to the UV light source conduit to The aperture mechanism is used and used as a mask to control the illumination range of the UV light. The UV light irradiation device of claim 2, wherein the aperture of the aperture mechanism is circular or of other shapes. According to the UV light irradiation device described in claim 2, the aperture mechanism can be operated at a fixed position or can be displaced in one dimension while operating to achieve an optimal light intensity control effect. According to the UV light irradiation device described in claim 2, the aperture mechanism can be equipped with an optical element such as a lens as needed to achieve an optimal light intensity control effect.