Method for manufacturing multilayer film for recording and reproducing, and device for manufacturing multilayer film for recording and reproducing

Abstract

The manufacturing method of a multilayer film for recording and reproducing includes: a coating step, in which a liquid containing an ultraviolet curing resin and whose optical properties change when irradiated with light is applied to one surface of a light-transmitting film; a drying step, in which the liquid applied to the film by the coating step is dried; a winding step, in which a polygonal roller having a polygonal shape in a cross section perpendicular to a rotating axis is rotated to wind up the film coated with the liquid after the drying step, i.e., the coated film; and an ultraviolet irradiation step, in which ultraviolet rays are irradiated on the coated film wound on the polygonal roller.

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a multi-layer film for recording and reproducing and an apparatus for manufacturing the multi-layer film for recording and reproducing. Background Art

[0002] As a method for increasing the recording capacity of an optical disc, there has been proposed a laminated film in which a plurality of thin films (intermediate layers) that transmit light and recording layers whose optical properties change when irradiated with light are alternately laminated.

[0003] As a method for producing a laminated film by a Roll-to-Roll (R2R) type, a coextrusion method and a method of repeating coating and curing are known (Patent Documents 1 and 2).

[0004] Prior Art Literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application No. 2016-506589

[0007] Patent Document 2: U.S. Patent No. 7936802 Summary of the invention

[0008] However, the co-extrusion method can only use thermoplastic materials, and needs to consider the solubility of the dye and the solubility of the two layers of the laminated materials. Therefore, the co-extrusion method has a problem that the width of material selection is very narrow.

[0009] In addition, the method of repeated coating and drying has a wide range of material selection, but it is necessary to repeat coating and curing in the multi-layering, or it is necessary to prepare a plurality of rolls and bond them by roll lamination to form a multi-layer. Therefore, the method of repeated coating and drying requires a large-scale device, and it is very difficult to achieve both cost and yield.

[0010] An object of the present disclosure is to provide a technology for efficiently manufacturing a multi-layer film for recording and reproducing.

[0011] A method for manufacturing a multilayer film for recording and reproducing according to one embodiment of the present invention includes: a coating step, in which a liquid containing an ultraviolet curing resin and whose optical properties change when irradiated with light is applied to one surface of a light-transmitting film; a drying step, in which the liquid applied to the film by the coating step is dried; a winding step, in which a polygonal roller having a polygonal shape in a cross-section perpendicular to a rotation axis is rotated to wind up the film coated with the liquid after the drying step, i.e., the coated film; and an ultraviolet irradiation step, in which ultraviolet rays are irradiated on the coated film wound on the polygonal roller.

[0012] A manufacturing device for a multilayer film for recording and reproducing involved in one embodiment of the present invention includes: a coating device that applies a liquid containing an ultraviolet curing resin and whose optical properties change when irradiated with light to one side of a light-transmitting film; a drying device that dries the liquid applied to the film by the coating device; a polygonal roller, the shape of a cross-section perpendicular to the rotation axis is a polygon, the polygonal roller rotates to wind up the film coated with the liquid after drying by the drying device, i.e., the coated film; and an ultraviolet irradiation device that irradiates ultraviolet rays to the coated film wound on the polygonal roller.

[0013] According to the present disclosure, a multi-layer film for recording and reproducing can be produced efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a diagram showing a configuration example of an apparatus for manufacturing a multi-layer film for recording and reproducing according to the first embodiment.

[0015] Figure 2 This is a diagram showing an example of a method for manufacturing an optical disc.

[0016] Figure 3 This is a diagram for explaining the cutting process.

[0017] Figure 4 This is a diagram for explaining the cutting process.

[0018] Figure 5 This is a diagram for explaining the pasting process.

[0019] Figure 6 This is a diagram for explaining the recording process.

[0020] Figure 7 This is a diagram showing a configuration example of an apparatus for manufacturing a multi-layer film for recording and reproducing according to the second embodiment. DETAILED DESCRIPTION

[0021] Hereinafter, the embodiments of the present disclosure will be described in detail with appropriate reference to the accompanying drawings. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to make it easy for those skilled in the art to understand. In addition, the drawings and the following descriptions are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0022] (Implementation Method 1)

[0023] <Structure of Manufacturing Apparatus>

[0024] Figure 11 is a diagram showing a configuration example of a manufacturing apparatus for a multilayer film for recording and reproducing (hereinafter referred to as a "manufacturing apparatus") according to Embodiment 1. Figure 1 In the description, for convenience, the direction from left to right in the drawing is expressed as the X-axis, the direction from bottom to top of the paper is expressed as the Y-axis, and the direction from the depth of the paper to the front is expressed as the Z-axis.

[0025] The manufacturing device 10 includes a film roll 20 , a pre-treatment device 25 , a coating device 30 , a drying device 40 , a laminating roll 50 , a polygonal roll 60 , an ultraviolet (UV) irradiation device 70 , and a separator arrangement device 80 .

[0026] The film roll 20 is a device for setting a roll of film 101. The film 101 is a thin, transparent film that transmits light, such as a PET (polyethylene terephthalate) film. The film 101 forms a multilayer film 120 for recording and reproducing optical disks (see Figure 5 ) The intermediate layer 121 in the film 101. The thickness of the film 101 (thickness in the Y-axis direction) is, for example, 10 μm or less.

[0027] The film roll 20 and the polygonal roll 60 form a roll-to-roll (R2R). That is, according to the rotation of the polygonal roll 60, the film roll 20 also rotates, and the film 101 is pulled out from the coil set on the film roll 20, and the pulled film 101 is maintained in a tense state and is wound around the polygonal roll 60.

[0028] The pre-treatment device 25 is a device for performing a UV ozone treatment and / or a plasma treatment process (hereinafter referred to as a “pre-treatment process”) on both surfaces of the film 101 .

[0029] The coating device 30 is a device that performs a process of coating a liquid adhesive 102 on one side of the film 101 (hereinafter referred to as a "coating process"). For example, the coating device 30 coats the liquid adhesive 102 with a uniform film thickness on the upper surface (the surface in the positive direction of the Y axis) of the film 101 pulled out from the film roller 20 by a die coating method. The coating device 30 coats the adhesive 102 with a film thickness of, for example, 10 μm or less. Hereinafter, the surface of the film 101 coated with the adhesive 102 is sometimes referred to as an upper surface, an inner surface, or a coated surface, and the surface of the film 101 not coated with the adhesive 102 is sometimes referred to as a lower surface, an outer surface, or a non-coated surface.

[0030] The adhesive 102 at least includes an ultraviolet (UV) curable resin and a material whose optical properties (such as reflectivity or refractive index) change when irradiated with light. The material whose optical properties change when irradiated with light can be an organic pigment (dye) that is easily soluble in a solution. The organic pigment can produce two-photon absorption. In addition to the above-mentioned materials, the adhesive 102 can also include a cross-linking agent and a photopolymerization initiator. The adhesive 102 forms a multilayer film 120 for recording and reproducing the optical disc (see Figure 5 ) in the recording layer 122.

[0031] The drying device 40 is a device that performs a process of drying the adhesive 102 applied to the film 101 (hereinafter referred to as the "drying process"). For example, the drying device 40 heats and dries the adhesive 102 on the film 101 after the coating process. The heating temperature is, for example, below 150 degrees. As a result, the solvent contained in the liquid adhesive 102 applied to the upper surface of the film 101 evaporates, the viscosity of the adhesive 102 increases, and the film thickness of the adhesive 102 becomes thinner. The film thickness of the adhesive 102 after the drying process is, for example, below 1μm. In other words, the drying device 40 dries the adhesive 102 on the upper surface of the film 101 so that the film thickness of the adhesive 102 after the drying process is below 1μm. Hereinafter, the film 101 and the adhesive 102 applied to the upper surface of the film 101 after the drying process are collectively referred to as a coated film 103.

[0032] The polygonal roller 60 is a device that performs a process of winding the coating film 103 (hereinafter referred to as the "winding process"). The polygonal roller 60 has a rotating shaft 61 parallel to the Z axis, and is a roller whose cross-section perpendicular to the rotating shaft 61 is polygonal. That is, the three-dimensional shape of the polygonal roller 60 is a shape in which a prism is inverted. Hereinafter, each side surface (surface parallel to the Z axis) of the polygonal roller 60 when it is regarded as a prism is referred to as a plate 62, and the boundary line of the adjacent side surface (side parallel to the Z axis) is referred to as an edge 63. In other words, the side connecting the vertices of the opposite bottom surfaces in the prism is referred to as an edge 63. In the present embodiment, as Figure 1 As shown, the example in which the cross-sectional shape of the polygonal roll 60 is a hexagon (in other words, a hexagonal prism) is described, but the cross-sectional shape of the polygonal roll 60 may be any polygon. In addition, the cross-sectional shape of the polygonal roll 60 is preferably a regular polygon.

[0033] The polygonal roller 60 rotates around the rotation axis 61, and winds up the coating film 103 after the drying process. The coating film 103 is wound up by the polygonal roller 60, so that the coating film 103 is stacked on each plate 62 of the polygonal roller 60. For example, when the polygonal roller 60 rotates 20 times, 20 layers of the coating film 103 are stacked on each plate 62. In other words, the set of the intermediate layer 121 and the recording layer 122 is stacked in 20 layers. Hereinafter, the member on which the coating film 103 is stacked is referred to as a stacked film 104.

[0034] The length of one side of the polygon of the polygonal roller 60 is equal to the diameter 2r of the optical disk (see Figure 4 ) or more. In addition, the length of the edge 63 of the polygonal roller 60 is greater than the diameter 2r of the optical disk. As described later, in the cutting process, the laminated film 104 formed on each plate 62 of the polygonal roller 60 is cut into a circular shape having the same diameter 2r as the optical disk, thereby obtaining a circular laminated film 106 (see Figure 4 ).

[0035] In addition, if Figure 1 as well as Figure 3 As shown, a gap 64 of a predetermined width from the apex of the polygon to the rotation axis 61 can be formed along the edge 63 of the polygonal roller 60. As described later, in the cutting process, a blade is inserted into the gap 64 and moved along the edge 63, thereby removing the laminated film 104 from the polygonal roller 60, and the roll of the laminated film 104 wound on the polygonal roller 60 can be divided into the laminated film 104 of each plate 62 (see Figure 4 ).

[0036] The laminating roller 50 is a device for performing a process of applying pressure to the coating film 103 newly wound on the polygonal roller 60 (hereinafter referred to as the "laminating process"). For example, the laminating roller 50 is set at a position where the polygonal roller 60 starts to wind a new coating film 103, and applies pressure in a direction (ie, toward the rotation axis 61 of the polygonal roller 60) to one side (plate 62) of the polygonal roller 60. Figure 1 In addition, the rotation axis of the laminating roller 50 can move toward or away from the rotation axis 61 of the polygonal roller 60 according to the rotation of the polygonal roller 60 ( Figure 1 The coating film 103 is moved in the vertical direction (Y-axis direction). This prevents the outer surface of the coating film 103 previously wound on the polygonal roller 60 and the inner surface of the coating film 103 newly wound on the polygonal roller 60 (in other words, wound on the outermost side) from generating gaps and bubbles. That is, the coating films 103 are accurately stacked without gaps.

[0037] The UV irradiation device 70 is a device that performs a process of irradiating ultraviolet rays (UV) to the coating film 103 wound on the polygonal roll 60 (hereinafter referred to as "UV irradiation process"). For example, the UV irradiation device 70 irradiates UV to the coating film 103 wound on the polygonal roll 60 after being pressed by the laminating roll 50. As a result, the UV curing resin contained in the adhesive 102 on the inner surface of the coating film 103 newly wound on the polygonal roll 60 (in other words, wound on the outermost side) is cured and adhered to the outer surface of the coating film 103 previously wound on the polygonal roll 60. That is, the laminated coating films 103 are fixed to each other.

[0038] The spacer arranging device 80 is a device for performing a process (hereinafter referred to as "spacer arranging process") of arranging the spacer 105 on the upper surface of the coating film 103 every time the polygonal roller 60 rotates a predetermined number of times. The spacer 105 is a sheet of material that does not adhere to the adhesive 102 and the film 101, such as a paper sheet. The length of the spacer 105 in the X-axis direction is, for example, greater than the perimeter of the polygon of the polygonal roller 60.

[0039] For example, when the polygonal roller 60 rotates a predetermined number of times, the separator arranging device 80 arranges the separator 105 on the upper surface of the coating film 103 after the drying process and before being wound around the polygonal roller 60. The separator 105 arranged on the upper surface of the coating film 103 is wound around the polygonal roller 60 together with the coating film 103 by the rotation of the polygonal roller 60. Thus, even if the UV irradiation process 205 is performed on the coating film 103 newly wound together with the separator 105, the adhesive 102 on the upper surface of the coating film 103 is cured, and the inner surface of the coating film 103 is not bonded to the outer surface of the separator 105 wound together. Therefore, every time the polygonal roller 60 rotates the same number of times as the number of layers desired for the laminated film 104, the separator arranging device 80 arranges the separator 105, and the roll of the laminated film 104 can be separated for each predetermined number of layers without cutting the film 101 in the middle of the R2R. That is, a plurality of laminated films 104 having a desired number of layers can be obtained from each plate 62 .

[0040] <Method for manufacturing optical disc>

[0041] Figure 2 This is a diagram showing an example of a method for manufacturing an optical disc.

[0042] In the method for manufacturing the multi-layer film for recording and reproducing 120, a pretreatment step 200, a coating step 201, a drying step 202, a winding step 203, a lamination step 204, a UV irradiation step 205, a spacer arrangement step 206, and a cutting step 207 are performed. However, this manufacturing method is an example, and when manufacturing the multi-layer film for recording and reproducing 120, at least one of these steps may be omitted.

[0043] In the optical disk manufacturing method, the multi-layer recording and reproducing film 120 manufactured by the above-mentioned manufacturing method is further subjected to a cutting step 208 and a pasting step 209. These steps will be described in detail below.

[0044] <<Pre-treatment process>>

[0045] In the pretreatment step 200 , the film 101 is subjected to double-sided UV ozone treatment and / or plasma treatment, etc. This improves the surface of the film 101 and improves coating properties in the coating step 201 and adhesion properties in the UV irradiation step 205 .

[0046] <<Coating process>>

[0047] In the coating process 201, the coating device 30 applies the liquid adhesive 102 by die coating to the upper surface of the film 101 pulled out from the film roll 20 and maintained in a tense state so as to have a uniform film thickness of, for example, 10 μm or less. Thus, the adhesive 102 is applied to the upper surface of the film 101 with a uniform film thickness.

[0048] <<Drying process>>

[0049] In the drying process 202, the drying device 40 heats and dries the adhesive 102 applied to the upper surface of the film 101 in the coating process 201 so as to have a uniform film thickness of, for example, 1 μm or less, thereby obtaining a coated film 103. The temperature of the heating and drying is, for example, 150 degrees or less. As a result, the solvent contained in the adhesive 102 applied to the upper surface of the film 101 evaporates, the viscosity of the adhesive 102 increases, and the film thickness of the adhesive 102 decreases.

[0050] <<Winding process>>

[0051] In the winding process 203, the polygonal roller 60 rotates, and the coating film 103 after the drying process 202 is wound while maintaining the tension state of the film 101 by R2R. Thus, each time the polygonal roller 60 is wound once, the coating film 103 is stacked one layer on each plate 62 of the polygonal roller 60. That is, the number of stacked coating films 103 corresponding to the number of rotations of the polygonal roller 60 is stacked on each plate 62 of the polygonal roller 60. Therefore, the number of stacked films 104 corresponding to the number of rotations of the polygonal roller 60 can be easily generated.

[0052] In addition, Figure 1 In the figure, the film roll 20 and the polygonal roll 60 are both configured to rotate counterclockwise. However, if R2R can be achieved, the film roll 20 and the polygonal roll 60 may be rotated in any direction.

[0053] <<Laminating Process>>

[0054] In the laminating process 204, the laminating roller 50 applies a pressing force to the coating film 103 wound around the outermost side of the polygonal roller 60 through the winding process 203. Thereby, it is possible to prevent gaps and air bubbles from being generated between the outer surface of the coating film 103 previously wound around the polygonal roller 60 and the inner surface of the coating film 103 newly wound around the polygonal roller 60 (in other words, wound around the outermost side). That is, the coating films 103 are precisely laminated without gaps between each other.

[0055] <<UV Irradiation Process>>

[0056] In the UV irradiation process 205, the UV irradiation device 70 irradiates UV on the coating film 103 after the laminating process 204 wound around the polygonal roller 60. Thereby, the UV curable resin contained in the adhesive 102 on the inner surface of the coating film 103 newly wound around the polygonal roller 60 (in other words, wound around the outermost side) cures and bonds to the outer surface of the coating film 103 previously wound around the polygonal roller 60. That is, the laminated coating films 103 are fixed to each other. In addition, the UV irradiation process 205 can also be performed at any position during one revolution of the coating film 103 newly wound around the polygonal roller 60.

[0057] <<Separator Arrangement Process>>

[0058] In the separator arrangement process 206, whenever the polygonal roller 60 rotates a predetermined number of times ( Figure 2 when the determination 221 is yes), the separator arrangement device 80 arranges the separator 105 on the upper surface of the coating film 103 after the drying process 202 and before being wound around the polygonal roller 60. Thereby, the separator 105 arranged on the upper surface of the coating film 103 is wound around the polygonal roller 60 together with the coating film 103 by further rotation of the polygonal roller 60. Therefore, even if the UV irradiation process 205 is performed on the coating film 103 newly wound together with the separator 105, the adhesive 102 on the inner surface of the coating film 103 cures, and the inner surface of the coating film 103 does not bond to the outer side surface of the separator 105 wound together. Therefore, whenever the polygonal roller 60 rotates the same number of times as the desired number of laminations of the laminated film 104, by arranging the separator 105 through the separator arrangement device 80, it is possible to obtain the laminated film 104 with the desired number of laminations from each plate 62 without cutting the film 101 in the middle of R2R.

[0059] For example, when a 20-layer recording and reproducing multilayer film 120 is desired, the partition arranging step 206 is performed every time the polygonal roller 60 rotates 20 times. As a result, the roll of the laminated film 104 wound on the polygonal roller 60 after the completion of the R2R is sandwiched with the partition 105 every 20 layers. Therefore, in the cutting step 207 described later, when the roll of the laminated film 104 wound on the polygonal roller 60 is cut along the edge 63 in the Z-axis direction, the laminated film 104 formed on each plate 62 is separated every 20 layers by the partition 105. In other words, a plurality of 20-layer laminated films 104 can be obtained from one plate 62.

[0060] <<Cutting process>>

[0061] Figure 3 This is a diagram for explaining the cutting step 207 .

[0062] The cutting step 207 is performed after the winding by the polygonal roller 60 is completed ( Figure 2 In the cutting process 207, along the edge 63, as shown in FIG. Figure 3 As shown by the dotted line 66, the blade passes through the gap 64 formed from the apex of the polygon to the rotation axis 61, and cuts the roll of the laminated film 104 wound on the polygonal roll 60 in the Z-axis direction along the edge 63 of the polygonal roll 60. In this way, the laminated film 104 can be removed from the polygonal roll 60, and a flat laminated film 104 can be obtained from each plate 62 of the polygonal roll 60.

[0063] When the separator 105 is sandwiched, the laminated film 104 in each plate 62 after the cutting step 207 is separated by the separator 105. For example, when the separator 105 is sandwiched every 20 layers, a plurality of 20-layer laminated films 104 can be obtained on each plate 62 of the polygonal roll 60.

[0064] <<Cutting process>>

[0065] Figure 4 This is a diagram for explaining the cutting step 208 .

[0066] In the cutting process 208, if Figure 4 As shown in FIG. 1 , the laminated film 104 obtained by cutting from each plate 62 of the polygonal roller 60 in the cutting step 207 is cut into a circle having the same diameter 2r as the optical disk. The circular laminated film 104 obtained by the cutting step 208 is referred to as a circular laminated film 106. In the cutting step 208, a plurality of circular laminated films 106 may be cut from one laminated film 104.

[0067] <<Pasting process>>

[0068] Figure 5 This is a diagram for explaining the pasting step 209.

[0069] In the pasting process 209, if Figure 5 As shown, a circular laminated film 106 (in other words, a recording and reproducing multilayer film 120) is attached to a substrate 110 with a guide track. The guide track is a concave-convex structure for guiding the recording and reproducing light irradiated to the optical disc. For example, a plastic material or glass can be used as the material of the substrate 110 with a guide track. From the perspective of cost, a plastic material is preferably used. For example, a polycarbonate resin, a polyolefin resin, an acrylic resin, etc. can be used as the plastic material.

[0070] Furthermore, in the pasting step 209, a transparent protective layer 130 that transmits light may be formed on the circular laminated film 106. The material of the protective layer 130 may also include a resin such as a light-curing resin (especially an ultraviolet curing resin) or a slow-acting thermosetting resin. In addition, the outer cover layer 133 may also be a layer that absorbs less laser light used. In addition, the outer cover layer 133 may be formed using a resin such as polycarbonate, amorphous polyolefin, or polymethyl methacrylate (PMMA), or glass.

[0071] Through this pasting step 209 , an optical disc is manufactured in which the circular laminated thin film 106 (in other words, the recording and reproducing multilayer film 120 ) is pasted on the substrate 110 with a guide rail.

[0072] <Recording process>

[0073] Figure 6 This is a diagram for explaining the recording process. Figure 2 The optical disc is manufactured by the process of Figure 5 ), a recording process is performed, so that data can be recorded on each recording layer 122 of the optical disk. The recording process is performed by, for example, a drive device for recording and reproducing.

[0074] In the recording process, Figure 6 As shown, light (e.g., blue light) is irradiated to a desired recording layer 122 and a desired position among the plurality of recording layers 122 of the optical disc. As a result, the optical properties (e.g., reflectivity or refractive index) of the position irradiated with light change. The position where the optical properties change is called a recording mark 123.

[0075] like Figure 6 As shown, the optical disc manufactured by the manufacturing method of the present disclosure has a large number of recording layers 122, and thus can record a large amount of data compared to a conventional optical disc having a small number of recording layers.

[0076] In addition, when reproducing data recorded on the optical disc, light (for example, blue light) is irradiated to a desired recording layer 122 and a desired position among the plurality of recording layers 122 of the optical disc. The optical characteristics (for example, reflectivity or refractive index) are different when a recording mark 123 is present at the position and when a recording mark 123 is not present. Therefore, by detecting the difference in optical characteristics with respect to the irradiated light, it is possible to detect whether a recording mark 123 is present at the position. In this way, the data recorded on the recording layer 122 of the optical disc can be reproduced.

[0077] As described above, the multi-layered film for recording and reproducing 120 having a desired number of stacked layers can be efficiently manufactured by the manufacturing apparatus and manufacturing method according to Embodiment 1. In addition, the material selectivity in the recording layer 122 can be improved.

[0078] (Implementation Method 2)

[0079] In Embodiment 1, a method for manufacturing a desired number of stacked films 104 without cutting the film 101 in the middle of R2R by disposing a partition 105 is described. In Embodiment 2, a manufacturing apparatus and a manufacturing method for manufacturing a desired number of stacked films 104 by cutting the coating film 103 in the middle of R2R without disposing a partition 105 are described. In Embodiment 2, the same reference numerals may be given to the components already described in Embodiment 1, and the description thereof may be omitted.

[0080] <Structure of Manufacturing Apparatus>

[0081] Figure 7 This is a diagram showing a configuration example of a manufacturing apparatus according to the second embodiment.

[0082] The manufacturing device 10 includes a film roll 20 , a pre-treatment device 25 , a coating device 30 , a drying device 40 , a guide roll 90 , a laminating roll 50 , a polygonal roll 60 , and a UV irradiation device 70 .

[0083] The film roll 20 , the pretreatment device 25 , the coating device 30 , the drying device 40 , the laminating roll 50 , the polygonal roll 60 , and the UV irradiation device 70 have already been described in the first embodiment.

[0084] The guide roller 90 is a device that guides the conveyance of the coating film 103 after the drying process 202 to the polygonal roller 60. For example, the guide roller 90 sandwiches the coating film 103 from above and below to maintain the tension of the film 101. Therefore, even if the coating film 103 is cut at the cutting position 91 between the guide roller 90 and the polygonal roller 60, the tension of the film 101 can be maintained between the guide roller 90 and the film roller 20.

[0085] Therefore, when the desired number of stacked layers of the laminated film 104 is wound around the polygonal roller 60, the coated film 103 is cut at the cutting position 91, and the laminated film 104 wound around the polygonal roller 60 is subjected to the cutting step 207 and subsequent steps described in Embodiment 1, thereby manufacturing an optical disc having the desired number of stacked layers of the multilayer film 120 for recording and reproducing. In addition, since the film 101 can be kept in a tense state between the guide roller 90 and the film roller 20, the polygonal roller 60 can newly start winding the coated film 103 cut at the cutting position 91.

[0086] As described above, by the manufacturing apparatus and the manufacturing method according to the second embodiment, a recording and reproducing multi-layer film having a desired number of layers can be manufactured without providing the spacer 105 .

[0087] (Control of manufacturing equipment)

[0088] The actions of the various components of the manufacturing device 10 described above can be controlled by a predetermined control device (not shown). For example, the control device includes a processor and a memory. The processor and the memory cooperate to control the actions of the various components of the manufacturing device 10 described above. For example, the processor reads from the memory and executes a computer program that controls the actions of the various components of the manufacturing device 10 described above. The control device can be built into the manufacturing device 10. Alternatively, the control device can also be a device independent of the manufacturing device 10, and controls the manufacturing device 10 through a predetermined communication network.

[0089] (Summary of this disclosure)

[0090] A method for producing a multilayer film (120) for recording and reproducing according to one embodiment of the present disclosure includes: a coating step (201) of coating a liquid (102) containing an ultraviolet curing resin and having optical properties changed by irradiation with light on one surface of a light-transmitting film (101); a drying step (202) of drying the liquid applied to the film (101) by the coating step (201); a winding step (203) of rotating a polygonal roller (60) having a polygonal cross-section perpendicular to a rotation axis (61) to wind up the film (101) coated with the liquid (102) after the drying step (202), i.e., a coated film (103); and an ultraviolet irradiation step (205) of irradiating ultraviolet light to the coated film (103) wound on the polygonal roller (60). The liquid (102) may contain an organic pigment whose optical properties change by irradiation with light.

[0091] According to the manufacturing method, the coating film (103) newly wound on the polygonal roller (60) (in other words, wound on the outermost side) is irradiated with ultraviolet rays. Therefore, the ultraviolet curing resin contained in the liquid (102) applied on one side of the coating film (103) is cured, and one side of the newly wound coating film (103) is bonded to the other side of the coating film (103) previously wound on the polygonal roller (60). Therefore, by rotating the polygonal roller (60), a plurality of coating films (103) are stacked on the polygonal roller (60) to form a multilayer film (120) for recording and reproducing. That is, according to the manufacturing method, the multilayer film (120) for recording and reproducing can be efficiently manufactured.

[0092] The manufacturing method of the above-mentioned multilayer film (120) for recording and reproducing may also include: a partition configuration step (206), in which a sheet-like partition (105) is configured on the upper surface of the coated film (103) after the drying step (202) and before the winding step (203) each time the polygonal roller (60) rotates a predetermined number of times.

[0093] According to the manufacturing method, each time the polygonal roller (60) rotates a predetermined number of times, the partition (105) is also wound around the polygonal roller (60) together with the coating film (103). In this case, the ultraviolet curing resin contained in the liquid (102) applied to one surface of the coating film (103) newly wound around the polygonal roller (60) is cured by ultraviolet radiation, but does not adhere to the surface of the partition (105) wound together. Therefore, by setting the predetermined number of rotations of the polygonal roller (60) to the desired number of layers of the recording and reproducing multilayer film (120), the recording and reproducing multilayer film (120) with the desired number of layers can be efficiently manufactured without cutting the film (101) in the middle of R2R.

[0094] A gap (64) may be formed on the polygonal roller (60) extending from the vertices of the polygon toward the rotation axis (61). Furthermore, the method for manufacturing the multilayer film (120) for recording and reproducing may further include a cutting step (207) of passing a blade through the gap (64) to cut a roll of a laminated film (104) laminated with a coating film (103) after an ultraviolet irradiation step (205) wound on the polygonal roller (60).

[0095] According to the manufacturing method, the laminated film (104) formed on each plate (62) of the polygonal roller (60) can be easily removed from the polygonal roller (60), and a flat laminated film 104 can be obtained from each plate (62).

[0096] A manufacturing device (10) for a multilayer film (120) for recording and reproducing according to one embodiment of the present invention comprises: a coating device (30) for coating a liquid (102) containing an ultraviolet curing resin and whose optical properties change when irradiated with light onto one surface of a light-transmitting film (101); a drying device (40) for drying the liquid (102) applied to the film (101) by the coating device; a polygonal roller (60) having a polygonal shape in a cross section perpendicular to the rotation axis (61) and rotating to wind up the film (101) coated with the liquid (102) after drying by the drying device (40), i.e., a coated film (103); and an ultraviolet irradiation device (70) for irradiating ultraviolet rays onto the coated film (103) wound on the polygonal roller (60).

[0097] With this structure, the coating film (103) newly wound on the polygonal roller (60) (in other words, wound on the outermost side) is irradiated with ultraviolet rays. Therefore, the ultraviolet curing resin contained in the liquid (102) applied on one side of the coating film (103) is cured, and one side of the newly wound coating film (103) is bonded to the other side of the coating film (103) previously wound on the polygonal roller (60). Therefore, as the polygonal roller (60) rotates, a plurality of coating films (103) are stacked on the polygonal roller (60) to form a multilayer film (120) for recording and reproducing. That is, with this structure, the multilayer film (120) for recording and reproducing can be efficiently manufactured.

[0098] The manufacturing device (10) of the multilayer film (120) for recording and reproducing may further include: a film roll (20) provided with a roll of the film (101). Furthermore, the film roll (20) may form a roll-to-roll (R2R) with the polygonal roll (60).

[0099] With this structure, the multi-layer film (120) for recording and reproducing can be efficiently manufactured by R2R.

[0100] The above embodiments are described with reference to the accompanying drawings, but the present disclosure is not limited to the examples. If a person skilled in the art can think of various modification examples, correction examples, substitution examples, additional examples, deletion examples, and equivalent examples within the scope described in the claims, it is understood that these also belong to the scope of the technology disclosed in the present disclosure. In addition, the various structural elements in the above embodiments can also be arbitrarily combined within the scope of the main purpose of the invention.

[0101] Industrial Applicability

[0102] The technology disclosed herein is useful for producing a multilayer film for recording and reproducing.

[0103] -Explanation of symbols-

[0104] 10 Apparatus for manufacturing a multilayer film for recording and reproducing

[0105] 20 Film Roll

[0106] 25 Pretreatment device

[0107] 30 Coating device

[0108] 40 Drying device

[0109] 50 Lamination Rollers

[0110] 60 Polygon Roller

[0111] 61 Rotation axis

[0112] 62 Plates

[0113] 63 Edge

[0114] 64 Gap

[0115] 70 Ultraviolet (UV) irradiation device

[0116] 80 Bulkhead configuration device

[0117] 90 Guide roller

[0118] 101 film

[0119] 102 Binder

[0120] 103 Coating film

[0121] 104 Laminated Film

[0122] 105 Partition

[0123] 106 Circular Laminated Film

[0124] 110 Base plate with guide rails

[0125] 120 Multilayer film for recording and reproduction

[0126] 121 Middle Layer

[0127] 122 Recording Layer

[0128] 123 Record Mark

[0129] 130 protective layer

[0130] 200 Pretreatment process

[0131] 201 Coating process

[0132] 202 Drying process

[0133] 203 Winding process

[0134] 204 Lamination process

[0135] 205 Ultraviolet (UV) irradiation process

[0136] 206 Partition configuration process

[0137] 207 Cutting process

[0138] 208 Cutting process

[0139] 209 Pasting process.

Claims

1. A method for manufacturing a multilayer film for recording and reproducing, comprising: A coating step of coating a liquid containing an ultraviolet curable resin and having optical properties changed by irradiation with light on one surface of the light-transmitting film; a drying step of drying the liquid applied to the film in the coating step; A winding step in which a polygonal roller having a polygonal cross-section perpendicular to a rotation axis is rotated to wind up the film coated with the liquid after the drying step, i.e., the coated film; an ultraviolet irradiation step of irradiating the coating film wound on the polygonal roll with ultraviolet rays; and The separator disposing step is to dispose a sheet-shaped separator on the upper surface of the coating film after the drying step and before the winding step every time the polygonal roller rotates a predetermined number of times.

2. The method for producing a multilayer film for recording and reproducing according to claim 1, in, The manufacturing method further includes a laminating step of providing a laminating roller at a position where the polygonal roller starts to wind up the coating film, and applying a pressing force in a direction toward the rotation axis to one side of the polygonal roller.

3. The method for producing a multilayer film for recording and reproducing according to claim 2, in, The laminating roller is movable in a direction approaching or moving away from the rotation axis.

4. The method for producing a multilayer film for recording and reproducing according to any one of claims 1 to 3, in, In the polygonal roller, a gap is formed from the vertex of the polygon toward the rotation axis, The method for producing the multi-layer film for recording and reproducing further includes a cutting step of passing a knife blade through the gap to cut the roll of the laminated film wound around the polygonal roller on which the coating film after the ultraviolet irradiation step is laminated.

5. A manufacturing device for a multilayer film for recording and reproducing, comprising: a coating device for coating a liquid containing an ultraviolet curing resin and having optical properties changed by irradiation with light on one surface of the light-transmitting film; a drying device for drying the liquid applied to the film by the coating device; a polygonal roller having a polygonal cross-section perpendicular to the rotation axis, the polygonal roller being rotated to wind up the film coated with the liquid after drying by the drying device, that is, the coated film; an ultraviolet irradiation device for irradiating ultraviolet rays to the coating film wound on the polygonal roller; and The separator arranging device arranges a sheet-like separator on the upper surface of the coating film after drying by the drying device and before winding by the polygonal roller, every time the polygonal roller rotates a predetermined number of times.

6. The apparatus for manufacturing a multi-layer film for recording and reproducing according to claim 5, in, The manufacturing device further includes a laminating roller disposed at a position where the polygonal roller starts to wind up the coating film, and applying a pressing force in a direction toward the rotation axis to one side of the polygonal roller.

7. The apparatus for manufacturing a multi-layer film for recording and reproducing according to claim 6, in, The laminating roller is movable in a direction approaching or moving away from the rotation axis.

8. The apparatus for producing a multi-layer film for recording and reproducing according to any one of claims 5 to 7, in, The apparatus for producing the multi-layer film for recording and reproducing further comprises: a film roll on which the film roll is provided; The film roll and the polygonal roll form a roll-to-roll R2R.

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