Laminated body

Abstract

To provide a laminated body which can reduce decrease of luminance of an optical change element disposed in the laminated body.SOLUTION: In a laminated body of the present invention, a laser drawing layer drawn by a laser beam, a printing surface formation layer forming a printing surface, and a protection layer which protects the printing surface formation layer are layered on one surface of a core layer holding an IC chip. An optical change element is disposed between the laser drawing layer and the printing surface formation layer. One surface of the printing surface formation layer is smoother than the other surface of the printing surface formation layer. One surface of the laser drawing layer is smoother than the other surface of the laser drawing layer. The one surface of the printing surface formation layer is formed as the printing surface, and the laser drawing layer and the printing surface formation layer are adhered to each other on the smooth surfaces.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a laminate in which a laser drawing layer and a printing surface forming layer are laminated on the surface of a core layer and an optical change element is disposed.

Background Art

[0002] Currently, various types of cards are used in daily life. For example, cards with specific information or the like printed on the surface of a plastic substrate, magnetic cards such as telephone cards, or credit cards incorporating an IC memory, IC cards typified by my number cards, and passports using a data page with personal information or the like printed on a plastic substrate, and some are printed with images such as face photos for uses such as identity verification.

[0003] For such various cards, there is a technique of forming specific information or the like on the surface of a plastic substrate or a thermoplastic resin sheet by printing, and forming personal information or the like as a laser-colored image on a laser-coloring sheet laminated thereon to prevent forgery of the printed specific information.

[0004] For example, the present applicant has already disclosed a laminate having a base material layer (thermoplastic resin sheet), a laser coloring layer formed of a laser coloring sheet that colors with a predetermined laser beam, a transparent layer laminated on at least one surface of the laser coloring layer, and a printing layer between the upper layer of the transparent layer and the transparent layer and the laser coloring layer (Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Thermoplastic resin sheets, laser coloring sheets, etc. used in laminates generally have a difference in smoothness (smooth surface and rough surface) between the front and back in the manufacturing process.

[0007] In addition, in order to improve the security of the laminate, an optical change element (OVD) such as a hologram may be arranged in the laminate. At this time, the optical change element is generally attached to the surface with high smoothness for the purpose of improving the sticking quality.

[0008] The laminate is formed by thermocompression bonding after laminating a thermoplastic resin sheet, a laser coloring sheet, etc. In order to improve the efficiency of thermocompression bonding, it is preferable to perform thermocompression bonding in a state where the sheets are laminated so that the smooth surfaces or the rough surfaces are in contact with each other.

[0009] Therefore, since the laminate is laminated so that the smooth surface is in contact with the surface to which the optical change element is attached, when printing is performed on the sheet laminated immediately above the sheet to which the optical change element is attached, printing is performed on the rough surface, and the print quality is lower than when printing is performed on the smooth surface due to the surface unevenness. Accordingly, the luminance of the optical change element has been reduced.

[0010] The optical change element ensures security by changing the image observed depending on the viewing angle or by moving and observing, but if the luminance decreases, the above-described effects cannot be sufficiently exhibited, and there is a problem that security cannot be ensured.

[0011] An object of the present invention is to provide a laminate capable of reducing a decrease in luminance of an optical change element arranged in the laminate.

Means for Solving the Problems

[0012] The laminate of the present invention according to claim 1 is formed by laminating, on one surface of a core layer that holds an IC chip, a laser-drawn layer drawn by laser light, a printing surface forming layer that forms a printing surface, and a protective layer that protects the printing surface forming layer. An optical change element is attached to the surface of the laser-drawn layer that is adhered to the printing surface forming layer. One surface of the printing surface forming layer is smoother than the other surface of the printing surface forming layer, one surface of the laser-drawn layer is smoother than the other surface of the laser-drawn layer, one surface of the printing surface forming layer is used as the printing surface, and the surface where the laser-drawn layer and the printing surface forming layer are adhered is adhered as a smooth surface.

[0013] The present invention according to claim 2 is characterized in that, in the claim according to claim 1, a specularly reversed image of a visible image is printed on the printing surface.

[0014] The present invention according to claim 3 is characterized in that, in the laminate according to claim 1 or 2, the laser-drawn layer, the printing surface forming layer, and the protective layer laminated on the one surface of the core layer are also laminated on the other surface of the core layer.

Effect of the Invention

[0015] According to the laminate of the present invention, by making the attachment surface and the printing surface of the optical change element smooth surfaces and thermocompression bonding them respectively, it is possible to reduce the deterioration of printing quality and the accompanying decrease in the luminance of the optical change element.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0017] The laminate according to the first embodiment of the present invention has a surface that is thermally bonded to the laser drawing layer of the printing surface forming layer as the printing surface, and a specularly reversed image of a visible image is printed on the printing surface. Further, one surface of the printing surface forming layer is a printing surface forming layer smooth surface that is smoother than the other surface of the printing surface forming layer, and one surface of the laser drawing layer is a laser drawing layer smooth surface that is smoother than the other surface of the laser drawing layer. The printing surface forming layer smooth surface is used as the printing surface, and the surface of the laser drawing layer that is thermally bonded to the printing surface forming layer is used as the laser drawing layer smooth surface. According to this embodiment, by improving the printing quality, it is possible to reduce the decrease in the luminance of the optical change element.

[0018] The second embodiment of the present invention is the laminate in the first embodiment, and a laser drawing layer, a printing surface forming layer, and a protective layer laminated on one surface of the core layer are also laminated on the other surface of the core layer. According to this embodiment, by making the lamination forms on both surfaces of the core layer the same, the shrinkage rate during thermal pressure bonding becomes the same on one surface and the other surface, so the quality of the laminate is stabilized.

Example

[0019] The laminate according to the present invention will be described.

[0020] FIG. 1 is a conceptual diagram showing a laminate according to an embodiment of the present invention. FIG. 1(a) is a conceptual diagram showing each layer forming the laminate of this embodiment, and FIG. 1(b) is a conceptual diagram showing the laminated state.

[0021] The laminate of this embodiment is laminated with a laser drawing layer 3 drawn by laser light, a printing surface forming layer 4 forming a printing surface, and a protective layer 5 protecting the printing surface forming layer 4 on the surface of a core layer 2 that holds an IC chip 1. An optical change element 6 is disposed between the laser drawing layer 3 and the printing surface forming layer 4, and it is used, for example, as a passport or a card such as an identity card or a cash card.

[0022] It is preferable that a laser drawing layer 3 drawn by laser light, a printing surface forming layer 4 forming a printing surface, and a protective layer 5 protecting the printing surface forming layer 4 are also laminated on the back surface of the core layer 2.

[0023] In this way, the laser drawing layer 3, the printing surface forming layer 4, and the protective layer 5 laminated on the surface of the core layer 2 are also laminated on the back surface of the core layer 2, and the back surface of the core layer 2 is made to have the same lamination as the front surface. As a result, the shrinkage rate during thermocompression bonding becomes the same for the front and back surfaces, and the quality of the laminate is stabilized.

[0024] The core layer 2 is composed of a single layer or a plurality of thermoplastic resin sheets. For example, polycarbonate (PC), polyethylene terephthalate glycol (PETG), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene copolymer resin (ABS resin) can be used. The core layer 2 may be made of a single material or a combination of different materials. The core layer 2 is preferably composed of a plurality of sheets laminated to hold the IC chip 1.

[0025] The laser drawing layer 3 is formed by a laser coloring sheet made of a transparent resin that colors black or reddish-brown by an IR laser or a UV laser. As long as it has transparency, it is not particularly limited and is composed of a single layer or a plurality of thermoplastic resin sheets laminated. For the material of the thermoplastic resin sheet, polycarbonate (PC), polyethylene terephthalate glycol (PETG), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene copolymer resin (ABS resin) can be used. As the plurality of thermoplastic resin sheets, a single material or a combination of different materials may be used, and each thermoplastic resin sheet may be made of a material in which a plurality of materials are mixed.

[0026] Also, the printing surface forming layer 4 and the protective layer 5 may also be formed by a laser coloring sheet. By forming all the layers laminated on the core layer 2 with a laser coloring sheet, the coloring performance during laser irradiation can be improved.

[0027] Note that the laser drawing layer 3, the printing surface forming layer 4, and the protective layer 5 are preferably formed by the exact same laser coloring sheet. However, as long as the coloring performance for the same laser light is the same, some may contain different materials.

[0028] In the laminate of this embodiment, the surface adhered to the laser drawing layer 3 of the printing surface forming layer 4 is defined as the printing surface, and a specularly reversed image of a visible image is printed on the printing surface. Note that the printing surface is printed by offset printing, intaglio printing, or screen printing.

[0029] Note that the visible image refers to information that can be visually recognized when observing the laminate, and for example, refers to an image such as personal information or a face image. The specularly reversed image refers to an image obtained by specularly reversing the visible image.

[0030] One surface of the printing surface forming layer 4 is a printing surface forming layer smooth surface 4a that is smoother than the other surface of the printing surface forming layer 4. One surface of the laser drawing layer 3 is a laser drawing layer smooth surface 3a that is smoother than the other surface of the laser drawing layer 3. Also, one surface of the protective layer 5 is a protective layer smooth surface 5a that is smoother than the other surface of the protective layer 5, and the protective layer smooth surface 5a is arranged to be the outer surface. Then, the printing surface forming layer smooth surface 4a is used as the printing surface, the surface of the laser drawing layer 3 adhered to the printing surface forming layer 4 is defined as the laser drawing layer smooth surface 3a, and the optical change element 6 is attached to the laser drawing layer smooth surface 3a.

[0031] Here, "smooth" means that the numerical value of one surface measured using a general smoothness tester (for example, a Bekk smoothness tester) is higher than that of the other surface.

[0032] In this way, by using the printing surface forming layer smooth surface 4a as the printing surface, the printing quality is stabilized, and accordingly, a decrease in the luminance of the optical change element 6 can be prevented.

[0033] Note that the laser drawing layer 3 is preferably thicker than the protective layer 5, and the printing surface forming layer 4 is preferably thicker than the laser drawing layer 3. If the laser drawing layer 3 is 50 μm or less, indentations will occur due to the attachment of the optical change element 6. If the printing surface forming layer 4 is 75 μm or less, it cannot be properly conveyed during printing. Therefore, for example, it is preferable that the core layer 2 is 400 μm, the laser drawing layer 3 is 68 μm to 83 μm, the printing surface forming layer 4 is 90 μm to 110 μm, and the protective layer 5 is about 50 μm.

[0034] FIG. 2 is a diagram for explaining a specularly reversed image when characters are printed as a visible image. FIG. 2(a) is a view of the printing surface forming layer 4 as seen from the surface of the laminate (the protective layer 5 side), and FIG. 2(b) is a view of the printing surface forming layer 4 as seen from the back surface (the smooth surface 4a of the printing surface forming layer).

[0035] And FIG. 2(b) shows a specularly reversed image due to left - right reversal.

[0036] FIG. 3 is a diagram for explaining a specularly reversed image when characters and patterns are printed as a visible image. FIG. 3(a) is a view of the printing surface forming layer 4 as seen from the surface (the protective layer 5 side), and FIG. 3(b) is a view of the printing surface forming layer 4 as seen from the back surface (the smooth surface 4a of the printing surface forming layer).

[0037] And FIG. 3(b) shows a specularly reversed image due to left - right reversal.

Industrial Applicability

[0038] The present invention is suitable for laminates such as banknotes, stock certificates, securities, tickets, passports, cards, etc., but can also be used for other general laminates.

Explanation of Signs

[0039] 1 IC chip 2 Core layer 3 Laser drawing layer 3a Smooth surface of the laser drawing layer 4 Printing surface forming layer 4a Smooth surface of the printing surface forming layer 5 Protective layer 5a Smooth surface of the protective layer 6 Optical change element

Claims

1. On one surface of a core layer that holds an IC chip, a laser-drawn layer drawn by laser light, a printing surface forming layer that forms a printing surface, and a protective layer that protects the printing surface forming layer are laminated, A laminate in which an optical change element is attached to a surface of the laser-drawn layer that is adhered to the printing surface forming layer, One surface of the printing surface forming layer is smoother than the other surface of the printing surface forming layer, One surface of the laser-drawn layer is smoother than the other surface of the laser-drawn layer, One surface of the printing surface forming layer is used as the printing surface, The surface where the laser-drawn layer and the printing surface forming layer are adhered is adhered as a smooth surface A laminate characterized by this.

2. A specularly reversed image of a visible image is printed on the printing surface The laminate according to claim 1, characterized by this.

3. The laser-drawn layer, the printing surface forming layer, and the protective layer laminated on the one surface of the core layer are also laminated on the other surface of the core layer The laminate according to claim 1 or 2, characterized by this.

Images