JP7319881B2 - Authenticity determination card and its manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an authentication card containing a hidden pattern that is invisible with a watermark, and a method for manufacturing the same.

In recent years, various cards such as credit cards that are difficult to counterfeit are known. It is desired that such a card is difficult to forge, has a good design, and has high security.

Conventionally, cards described in Patent Documents 1 to 3 and the like are known as cards that are difficult to forge. Patent Document 1 describes a card in which a two-dimensional area sign is formed by partially overlapping printed layers having a multilayer structure with partially cut portions on a substrate, and the sign is visually recognized by incident light and transmitted light. is described.

Further, in Patent Document 2, a pattern is printed on a center core sheet layer A in a solid white negative pattern by printing. It has a laminated structure, and the white pattern is not visible to the naked eye in a normal state, but the card is identified by looking through it.

Further, in Patent Document 3, a watermarked card in which a watermark pattern is printed with dark ink between two laminated white resin layers constituting a core layer, and a magnetic layer is formed on one outer surface of the core layer. , and the pattern is recognized as a watermark by holding it up to light.

JP-A-55-095595 JP-A-58-168457 JP 2006-167955 A

However, the card of Patent Document 1 is difficult to counterfeit because the pattern is formed in a two-dimensional area with a multi-layer structure, but it is complicated to manufacture, and the sign can be recognized by holding it up to light. If the pattern is related to personal information, there is a problem that the security is not sufficient. In addition, in the cards of Patent Documents 2 and 3, although the layer structure is simpler than that of Patent Document 1, the pattern pattern is recognized by holding it up to light, which impairs the design. If the pattern is related to personal information, there is a problem that the security is not sufficient. Although there is a card provided with a concealing layer for concealing the magnetic layer provided in Patent Document 3, etc., it is merely for concealing the magnetic layer and is not used for authenticity determination and recognition.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an authenticity determination card that is difficult to forge, has a high degree of design and high security, and manufacture thereof.

In order to solve the above-mentioned problems, in the invention of claim 1, a hidden pattern that is invisible with a watermark is provided in the card, and the hidden pattern is visually recognized by light transmitted by intentional light irradiation. A color core layer which is a colored layer as a whole and is provided with the hidden pattern of a color different from the color of the layer at a predetermined position on at least one surface; and a silver layer, the color core layer a first silver hiding layer provided at a position covering at least the hidden pattern on one side of the color core layer on which the hidden pattern is formed; and a silver layer that covers at least the hidden pattern on the other side of the color core layer a second silver hiding layer provided at a corresponding position, a white layer, a first white hiding layer provided on at least the first silver hiding layer, a white layer, and at least the second silver hiding layer; and a second white hiding layer provided on the hiding layer, wherein at least positions of the first silver hiding layer and the first white hiding layer that do not overlap with the hidden pattern are perforated to form a hidden pattern of the color core layer. is exposed, or the side of the first silver hiding layer on which the hidden pattern is formed is exposed by perforating a position of the first white hiding layer that does not overlap with the hidden pattern. In this state, a visible pattern, which is integrated with the hidden pattern and serves as an authenticity identification pattern, is formed so as to be visually recognizable.

According to the invention of claim 2, the card for authenticity determination is provided with a hidden pattern that is invisible with a watermark in the card, and the hidden pattern is visually recognized by transmitted light by intentional light irradiation, and the card is colored as a whole. a color core layer provided with the hidden pattern of a color different from the color of the layer at a predetermined position on at least one surface; and a silver layer, on which the hidden pattern of the color core layer is formed. A first silver hiding layer provided on one surface at a position covering at least the hidden pattern; and a silver layer provided on the other surface of the color core layer at a position corresponding to at least the hidden pattern. a first white hiding layer which is a white layer and is provided on at least the first silver hiding layer; and a white layer which is a white layer and is provided on at least the second silver hiding layer. 2 a white hiding layer and a first colored layer which is a colored layer other than white and provided on at least the first white hiding layer, and does not overlap at least the hidden pattern of the first colored layer A configuration in which a visible pattern serving as an authenticity identification pattern is formed integrally with the hidden pattern in a state in which the side of the first white concealing layer on which the hidden pattern is formed is exposed by perforating a position and can be visually observed. and

According to the third aspect of the invention, there is provided a method for manufacturing an authenticity determination card in which a hidden pattern that is invisible with a watermark is provided in the card, and the hidden pattern is visually recognized by light transmitted through intentional light irradiation. forming the hidden pattern of a color different from the color of the color core layer at a predetermined position on at least one side of the colored color core layer; and covering at least the hidden pattern on one side of the color core layer. forming a silver-colored first silver hiding layer on a position and forming a silver-colored second silver hiding layer on the other side at least at a position corresponding to the hidden pattern; and forming a white second white hiding layer on at least the second silver hiding layer; and the hidden pattern of at least the first silver hiding layer and the first white hiding layer. The side of the color core layer on which the hidden pattern is formed is exposed by perforating a position that does not overlap with the first silver hiding layer, or the position of the first white hiding layer that does not overlap with the hidden pattern is perforated. exposing the side of the layer on which the hidden pattern is formed to form a visually recognizable pattern integrally with the hidden pattern and serving as an authenticity identification pattern.

According to the fourth aspect of the invention, there is provided a method for manufacturing an authenticity determination card in which a hidden pattern that is invisible with a watermark is provided in the card, and the hidden pattern is visually recognized by transmitted light by intentional light irradiation, forming the hidden pattern of a color different from the color of the color core layer at a predetermined position on at least one side of the colored color core layer; and covering at least the hidden pattern on one side of the color core layer. forming a silver-colored first silver hiding layer on a position and forming a silver-colored second silver hiding layer on the other side at least at a position corresponding to the hidden pattern; forming a first white hiding layer of and forming a white second white hiding layer on at least the second silver hiding layer; and forming a colored first colored layer other than white on at least the first white hiding layer and at least a position of the first colored layer that does not overlap with the hidden pattern is perforated to expose the side of the first white hiding layer on which the hidden pattern is formed, the hidden pattern. and a step of forming a visual recognition pattern integrally with and used as an authenticity identification pattern.

According to the invention of claim 1, a hidden pattern of a color different from the color of the layer is provided at a predetermined position on at least one surface of the colored color core layer, and at least one surface and the other surface of the color core layer are hidden. A first silver hiding layer and a second silver hiding layer are provided at positions corresponding to the pattern, and the first white hiding layer and the second white hiding layer are white on the first silver hiding layer and the second silver hiding layer. is provided, and at least the first silver hiding layer and the first white hiding layer are perforated at positions that do not overlap with the hidden pattern to expose the side of the color core layer on which the hidden pattern is formed, or the first white hiding layer In a state where the side of the first silver hiding layer on which the hidden pattern is formed is exposed by perforating a position that does not overlap with the hidden pattern, a visible pattern that is integrated with the hidden pattern and serves as an authenticity identification pattern is formed so as to be visually recognizable. With this structure, the color core layer can enhance the design and make it possible to easily judge the authenticity, and the silver-colored first silver hiding layer and the second silver hiding layer can be visually checked against the hidden pattern. The entire authentication is identified by visually recognizing the hidden pattern and the visible pattern exposed by the color core layer or the first silver hidden layer by intentionally transmitting light. This makes pattern counterfeiting difficult and maintains high security.

According to the invention of claim 2, a hidden pattern of a color different from the color of the layer is provided at a predetermined position on at least one surface of the colored color core layer, and at least one surface and the other surface of the color core layer are hidden. A first silver hiding layer and a second silver hiding layer are provided at positions corresponding to the pattern, and the first white hiding layer and the second white hiding layer are white on the first silver hiding layer and the second silver hiding layer. A first colored layer having a color other than white is provided on at least the first white concealing layer, and at least a position not overlapping the hidden pattern of the first colored layer is perforated to form the hidden pattern of the first white concealing layer. By forming a visible pattern, which is used as an authenticity identification pattern integrally with the hidden pattern, in a state in which the other side is exposed, the color core layer enhances the design and facilitates authenticity determination. In addition, the silver-colored first silver hiding layer and the second silver hiding layer make the hidden pattern invisible with a watermark, and the hidden pattern and the first white hidden layer are hidden by the transmitted light of intentional light irradiation. By visually recognizing the authenticity identifying pattern integrated with the visible pattern, it is possible to make it difficult to forge the entire authenticity identifying pattern and maintain high security.

According to the invention of claim 3, a hidden pattern having a color different from the color of the color core layer is formed at a predetermined position on at least one surface of the color core layer which is entirely colored, and one surface of the color core layer is formed. Forming a first silver hiding layer at a position covering at least the hidden pattern on the upper surface, forming a second silver hiding layer at a position corresponding to at least the hidden pattern on the other side, and forming at least the first silver hiding layer forming a white first white hiding layer thereon, forming a white second white hiding layer on at least the second silver hiding layer, and overlapping with at least the first silver hiding layer and the hidden pattern of the first white hiding layer; The side of the color core layer on which the hidden pattern is formed is exposed by perforating the position where the hidden pattern is not formed, or the position where the hidden pattern of the first silver hiding layer does not overlap is perforated so that the hidden pattern of the first silver hiding layer is exposed. By exposing the formed side and forming a visually recognizable pattern that is integrated with the hidden pattern and used as an authenticity identification pattern, it is possible to simply select a specific color for the color core layer on which the hidden pattern is formed. In a simple process, the hidden pattern and the exposed pattern of the color core layer or the first silver hiding layer are integrally formed by transmitted light, which is invisible with the watermark and is intentionally irradiated with light. It is possible to manufacture an authenticity determination card that allows visual recognition of the authenticity identification pattern.

According to the invention of claim 4, a hidden pattern having a color different from the color of the color core layer is formed at a predetermined position on at least one surface of the color core layer which is entirely colored, and one surface of the color core layer Forming a first silver hiding layer at a position covering at least the hidden pattern on the upper surface, forming a second silver hiding layer at a position corresponding to at least the hidden pattern on the other side, and forming at least the first silver hiding layer forming a white first white hiding layer thereon, forming a white second white hiding layer on at least the second silver hiding layer, and forming a first colored color other than white on at least the first white hiding layer A layer is formed, and at least a position that does not overlap with the hidden pattern of the first colored layer is perforated to expose the side of the first white hidden layer on which the hidden pattern is formed, and the hidden pattern is integrated with the hidden pattern for authenticity. By forming a visually recognizable pattern as an identification pattern, it is sufficient to simply laminate each layer of a specific color on the color core layer on which the hidden pattern is formed. It is possible to manufacture a card for determining authenticity that allows visual recognition of an authenticity identification pattern in which the hidden pattern and the visible pattern exposed by the first white masking layer are integrated with transmitted light that is invisible and intentionally irradiated. be.

1 is a configuration diagram of a first embodiment of an authentication card according to the present invention; FIG. 1. It is process drawing of manufacture of the card|curd for authenticity determination of FIG. FIG. 2 is an explanatory diagram of authenticity determination of the card for authenticity determination in FIG. 1 ; FIG. 4 is a cross-sectional configuration diagram of a second embodiment of the authentication card according to the present invention; FIG. 4 is a cross-sectional configuration diagram of another embodiment of the authentication card according to the present invention;

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a configuration diagram of a first embodiment of an authenticity determination card according to the present invention. FIG. 1(A) is a cross-sectional view of an authentication card, and FIG. 1(B) is a diagram showing the layer structure thereof. In FIGS. 1A and 1B, the card 11 for determining authenticity has a color core layer 12 made mainly of a colored resin and having a thickness of, for example, 560 μm. Known opaque red resins such as vinyl chloride (PVC), polyethylene terephthalate glycol (PET-G), polycarbonate (PC) are used. Red PVC is used in this embodiment. In addition, the overall coloring means that the resin itself has a color, and the color is preferably a primary color.

At a predetermined position on one surface of the color core layer 12, a hidden pattern 13A having a color different from the color of the color core layer 12 (for example, black) is provided by printing with ink to a thickness of 2 μm or less. The hidden pattern 13A is any one of letters, numbers, symbols, and marks for authenticity determination, and may be related to personal information. An IC chip or the like may be mounted on the color core layer 12 .

On the surface of the color core layer 12 on which the hidden pattern 13A is formed, a silver-colored first silver hiding layer 14A is printed, for example, with a known silver ink at a position covering at least the hidden pattern 13A. , for example with a thickness of 2 μm. Here, the entire surface of the color core layer 12 is provided so as to cover the hidden pattern 13A, but it is also possible to cover the region of the hidden pattern 13A and expose other portions of the color core layer 12 ( This also applies to the second silver hiding layer 14B described later).

In the first silver hiding layer 14A, a perforated portion 14A-1 is formed in a shape to be a later visible pattern at a position in the vicinity of the hidden pattern 13A and not overlapping the hidden pattern 13A.

On the other side of the color core layer 12, a second silver hiding layer 14B having a thickness of 2 .mu.m is provided at least at a position corresponding to the hidden pattern 13A. Here, it is provided on the entire surface of the other surface of the color core layer 12 .

On the first silver hiding layer 14A, a white first white hiding layer 15A is provided with a thickness of 2 μm, for example, by using a known white printing ink, for example, so as to cover the first silver hiding layer 14A. In the first white hiding layer 15A, at a position near the hidden pattern 13A that does not overlap, and in the same pattern and at the same position in the layer direction as the perforated portion 14A-1 of the first silver hiding layer 14A. A perforated portion 15A-1 is formed in the shape. That is, the perforated portion 15A-1 also has the shape of the later visible pattern.

On the other hand, on the second silver hiding layer 14B, a white second white hiding layer 15B is provided with a thickness of, for example, 2 μm using a known white printing ink, for example, so as to cover the second silver hiding layer 14B. . It should be noted that the first white concealing layer 15A and the second white concealing layer 15B may be appropriately provided with patterns, character information, etc. by printing, for example.

For example, a transparent first protective layer 16A, which is the outermost layer, is provided on the first white concealing layer 15A with a thickness of, for example, 100 μm. 16B is provided with a thickness of, for example, 100 μm. For the first protective layer 16A and the second protective layer 16B, transparent known resins such as PET, PVC, PET-G, and PC are used. This embodiment uses PVC.

The first protective layer 16A is perforated in the same position in the layer direction in the same pattern as the perforated part 15A-1 of the first white concealing layer 15A, in the vicinity of the hidden pattern 13A and not overlapping the hidden pattern 13A. A portion 16A-1 is formed in the shape. That is, the perforated portion 16A-1 also has the shape of the later visible pattern.

The perforations 14A-1, 15A-1, and 16A-1 expose the side of the color core layer 12 on which the hidden pattern 13A is formed, and form the authentication identification pattern 13 integrally with the hidden pattern 13A. A visually recognizable pattern 13B is formed. Although the case where the perforated portion 16A-1 is also formed in the first protective layer 16A is shown, the perforated portions 14A-1 and 15A-1 are formed only on the first silver hiding layer 14A and the first white hiding layer 15A. It may be formed.

Next, FIG. 2 shows a process chart for manufacturing the authentication card of FIG. Here, a method for manufacturing the structure of the authentication card 11 shown in FIG. 1 will be described. In FIG. 2, first, as shown in FIG. 2(A), a color (black) different from the color (red) of the color core layer 12 is placed at a predetermined position on one surface of the color core layer 12 (FIG. 3, which will be described later). A hidden pattern 13A as shown in (B) is formed by printing, for example.

As shown in FIG. 2B, a first silver hiding layer 14A having a thickness of, for example, 2 μm is formed on the entire surface covering the hidden pattern 13A on one side of the color core layer 12 by printing with silver ink. At the same time, as shown in FIG. 2(C), the entire surface including the positions corresponding to the hidden patterns 13A on the other surface of the color core layer 12 is coated with silver ink in the same manner as the first silver hiding layer 14A. A second silver hiding layer 14B having a thickness of, for example, 2 μm is formed by printing.

Subsequently, as shown in FIG. 2(D), white printing ink is used to print on the first silver hiding layer 14A to form a first white hiding layer 15A with a thickness of, for example, 2 μm. As shown in E), a second white hiding layer 15B having a thickness of, for example, 2 μm is formed on the second silver hiding layer 14B by printing using white printing ink.

Subsequently, as shown in FIG. 2(F), the first protective layer 16A is formed on the first white masking layer 15A by, for example, adhesion. A known adhesive for bonding resin materials is sufficient. Further, as shown in FIG. 2G, the second protective layer 16B is formed on the second white masking layer 15B by adhesion using the same adhesive as above.

Then, as shown in FIG. 2H, a predetermined position of the first protective layer 16A (for example, a position near the hidden pattern 13A in the layer direction that does not overlap) is irradiated with a laser beam 20 by, for example, a laser processing apparatus. By perforating the first protective layer 16A, the first white hiding layer 15A and the first silver hiding layer 14A in a predetermined pattern, the side of the color core layer 12 on which the hidden pattern 13A is formed is exposed. That is, depending on the color of the exposed color core layer 12, it becomes a visually recognizable pattern 13B, and becomes a visually recognizable pattern 13 that is integrated with the hidden pattern 13A and serves as the authenticity identification pattern 13. FIG. It should be noted that a portion unrelated to the hidden pattern 13A may be laser-processed to expose the processed portion of the color core layer 12 to form a desired character, symbol, figure, or the like.

By the way, FIG. 2 shows the case where the visible pattern 13B is finally formed by perforating including the first protective layer 16A. The first protective layer 16A and the second protective layer 16B may be formed after forming the final visible pattern 13B.

Therefore, FIG. 3 shows an explanatory diagram of authenticity judgment of the card for authenticity judgment of FIG. The card 11 for determining authenticity shown in FIG. 1 has a hidden pattern 13A that is invisible when exposed to normal external light due to the first silver hiding layer 14A and the second silver hiding layer 14B (see FIG. 3(B)). ), the visible pattern 13B is visually recognized as shown in the upper part of FIG. 3B. Therefore, as shown in FIG. 3A, irradiation light 21A is emitted from the irradiation light source 21 from the back surface of the authentication card 11 (the surface opposite to the surface on which the hidden pattern 13A is formed on the color core layer 12). The card 11 is intentionally irradiated with light and viewed from the front side of the card 11 for authenticity determination. The irradiation intensity in this case is based on, for example, the intensity of illumination light provided in a smart phone.

As shown in the lower part of FIG. 3(B), the hidden pattern 13A appears by the transmitted light by the irradiation light 21, and is integrated with the visible pattern 13B to be visually recognized as the authenticity identification pattern 13. FIG.

That is, the silver-colored first silver hiding layer 14A and the second silver hiding layer 14B are invisible to the hidden pattern 13A with normal watermarks, and can be visually recognized by transmitted light of intentional light irradiation. By integrating the hidden pattern 13A and the visible pattern 13B into the authentication identification pattern 13, it is possible to make counterfeiting difficult and maintain high security. Further, since the color core layer 12 is colored, the design is high, and since it can be visually recognized from the side, it is possible to easily judge the authenticity.

In addition, at least the first silver hiding layer 14A and the second silver hiding layer 14B, and the first white hiding layer 15A and the second white hiding layer 15B are simply formed with specific colors for the color core layer 12 on which the hidden pattern 13A is formed. In a simple process, the hidden pattern 13A and the visible pattern 13B are integrally integrated with the hidden pattern 13A and the visible pattern 13B. The card 11 can be manufactured.

Next, FIG. 4 shows a cross-sectional configuration diagram of a second embodiment of the authentication card according to the present invention. The authentication card 11 shown in FIG. 4 has a first protective layer 17A made of a coating material instead of the resin layers used for the first protective layer 16A and the second protective layer 16B of the authentication card 11 shown in FIG. and a second protective layer 17B, and the rest of the structure is the same as that shown in FIG. In this case, the thickness of the color core layer 12 is set to 760 μm in order to ensure strength.

The coating material is a known one, and is formed by printing to a thickness of 2 μm, for example. A visible pattern 13C is formed by perforating the coating material as the first protective layer 17A by laser processing.

As described above, by using the first protective layer 17A and the second protective layer 17B using the coating material, compared to the case of using the first protective layer 16A and the second protective layer 16B of the resin layer shown in FIG. The entire card can be thinned by using the first protective layer 17A, and a visible pattern 13C, which is integrated with the hidden pattern 13A and becomes the authenticity identification pattern 13, is formed on the first protective layer 17A.

Next, FIG. 5 shows a cross-sectional configuration diagram of another embodiment of the authentication card according to the present invention. 5A shows another embodiment of the authentication card 11 shown in FIG. 1, and FIG. 5B shows another embodiment of the authentication card 11 shown in FIG.

1 and 4, the hidden pattern 13A is formed on one surface of the color core layer 12. However, in the authentication card 11 shown in FIG. Then, another or the same hidden pattern 13A-1 is provided at a predetermined position on the other surface of the color core layer 12, and in addition, by laser processing from above the second protective layer 16B, perforations are made from above the first protective layer 16A. Similar to the formed visible pattern 13B, a visible pattern 13B-1 is formed to be integrated with the hidden pattern 13A-1 to form the authenticity identification pattern 13. FIG.

In addition, in the authentication card 11 shown in FIG. 5B, another or the same hidden pattern 13A-1 is provided at a predetermined position on the other surface of the color core layer 12, and in addition to this, a second protective layer A visible pattern 13C-1 that is integrated with the hidden pattern 13A-1 to form the authentication identification pattern 13, similarly to the visible pattern 13C that is formed by perforating the first protective layer 17A by laser processing from above 17B. is formed.

5A and 5B, the card 11 for determining authenticity shown in FIGS. 5A and 5B allows the user to visually recognize any of the hidden patterns 13A and 13A-1 by intentionally irradiating light from either side of the card. 13B, 13B-1, 13C, and 13C-1 are integrally recognized as the authenticity identification pattern 13, thereby enabling authenticity determination.

By the way, in the above-described embodiment, the visible pattern constituting the authenticity identification pattern 13 is formed by exposing the color core layer 12 by perforation by laser processing. The first silver hiding layer 14A and the second silver hiding layer 14B may be exposed by perforating them. Further, the protective layers 16A, 16B, 17A, 17B provided on the first white concealing layers 14A, 14B are colored other than white (first colored layer, second colored layer), and the protective layers 16A, 16B, 17A , 17B may be perforated by laser processing to expose the first white masking layer 15A and the second white masking layer 15B to form the visible pattern. Furthermore, colored printed layers (first colored layer, second colored layer) other than white are used in place of the protective layer, and the printed layers are perforated by laser processing to form a first white concealing layer 15A and a second white concealing layer. 15B may be exposed to form the visible pattern.

INDUSTRIAL APPLICABILITY The authentication card and the manufacturing method thereof according to the present invention can be used in industries such as the manufacture, use, and sale of cards on which a hidden pattern for authentication is formed.

11 Authenticity determination card 12 Color core layer 13 Authenticity identification pattern 13A, 13A-1 Hidden pattern 13B, 13B-1 Visible pattern 13C, 13C-1 Visible pattern 14A First silver hiding layer 14A-1 Perforated portion 14B Second silver hiding Layer 15A First white concealing layer 15A-1 Perforated portion 15B Second white concealing layer 16A, 17A First protective layer 16A-1 Perforated portion 16B, 17B Second protective layer 20 Laser light 21 Irradiation light source 21A Irradiation light

Claims (4)

A card for authenticity determination in which a hidden pattern that is invisible with a watermark is provided in the card, and the hidden pattern is visually recognized by transmitted light by intentional light irradiation,
a color core layer which is a colored layer as a whole and provided with the hidden pattern of a color different from the color of the layer at a predetermined position on at least one surface;
a first silver hiding layer which is a silver layer and is provided at a position covering at least the hidden pattern on one side of the color core layer on which the hidden pattern is formed;
a second silver hiding layer, which is a silver layer and is provided on the other surface of the color core layer at least at a position corresponding to the hidden pattern;
a first white hiding layer which is a white layer and which is provided on at least the first silver hiding layer;
a second white hiding layer which is a white layer and which is provided on at least the second silver hiding layer;
has
At least the positions of the first silver hiding layer and the first white hiding layer that do not overlap with the hidden pattern are perforated to expose the side of the color core layer on which the hidden pattern is formed, or the first white hiding layer A visible pattern that is integral with the hidden pattern and serves as an authenticity identification pattern is formed in a state in which the side of the first silver hiding layer on which the hidden pattern is formed is exposed by perforating the layer at a position that does not overlap with the hidden pattern. A card for determining authenticity, characterized in that it is formed so as to be visually recognizable. A card for authenticity determination in which a hidden pattern that is invisible with a watermark is provided in the card, and the hidden pattern is visually recognized by transmitted light by intentional light irradiation,
a color core layer which is a colored layer as a whole and provided with the hidden pattern of a color different from the color of the layer at a predetermined position on at least one surface;
a first silver hiding layer which is a silver layer and is provided at a position covering at least the hidden pattern on one side of the color core layer on which the hidden pattern is formed;
a second silver hiding layer, which is a silver layer and is provided on the other surface of the color core layer at least at a position corresponding to the hidden pattern;
a first white hiding layer which is a white layer and which is provided on at least the first silver hiding layer;
a second white hiding layer which is a white layer and which is provided on at least the second silver hiding layer;
a first colored layer that is a colored layer other than white and provided on at least the first white hiding layer;
has
At least a position of the first colored layer that does not overlap with the hidden pattern is perforated to expose the side of the first white hidden layer on which the hidden pattern is formed, and an authenticity identification pattern is integrated with the hidden pattern. The visible pattern is formed so that it can be viewed freely,
The visible pattern and the hidden pattern form part of the authenticity identification pattern,
The authenticity identification pattern is a pattern obtained by the visible pattern and the hidden pattern,
A card for authenticity determination characterized by: A method for manufacturing a card for authenticity determination in which a hidden pattern that is invisible with a watermark is provided in the card, and the hidden pattern is visually recognized by transmitted light by intentional light irradiation,
forming the hidden pattern of a color different from the color of the color core layer at a predetermined position on at least one surface of the color core layer that is entirely colored;
A first silver hiding layer is formed on one side of the color core layer at a position covering at least the hidden pattern, and a second silver hiding layer is formed on the other side at least at a position corresponding to the hidden pattern. forming;
forming a white first white hiding layer on at least the first silver hiding layer and forming a white second white hiding layer on at least the second silver hiding layer;
At least the positions of the first silver hiding layer and the first white hiding layer that do not overlap with the hidden pattern are perforated to expose the side of the color core layer on which the hidden pattern is formed, or the first white hiding layer A visually recognizable pattern that is integral with the hidden pattern and serves as an authenticity identification pattern by perforating the layer at a position that does not overlap with the hidden pattern and exposing the side of the first silver hiding layer on which the hidden pattern is formed. forming a
A method for manufacturing an authentication card, comprising: A method for manufacturing a card for authenticity determination in which a hidden pattern that is invisible with a watermark is provided in the card, and the hidden pattern is visually recognized by transmitted light by intentional light irradiation,
forming the hidden pattern of a color different from the color of the color core layer at a predetermined position on at least one surface of the color core layer that is entirely colored;
A first silver hiding layer is formed on one side of the color core layer at a position covering at least the hidden pattern, and a second silver hiding layer is formed on the other side at least at a position corresponding to the hidden pattern. forming;
forming a white first white hiding layer on at least the first silver hiding layer and forming a white second white hiding layer on at least the second silver hiding layer;
forming a first colored layer having a color other than white on at least the first white hiding layer;
At least a position of the first colored layer that does not overlap with the hidden pattern is perforated to expose the side of the first white hidden layer on which the hidden pattern is formed, and an authenticity identification pattern is integrated with the hidden pattern. A step of forming a visible pattern that can be visually observed,
including
The visible pattern and the hidden pattern form part of the authenticity identification pattern,
The authenticity identification pattern is a pattern obtained by the visible pattern and the hidden pattern,
A method of manufacturing an authentication card, characterized by :

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