JP7085942B2 - Anti-counterfeit structure, paper leaves, authenticity identification device, authenticity identification method and paper leaf processing device - Google Patents

Description

The present invention relates to an anti-counterfeit structure used for preventing counterfeiting of paper leaves, paper leaves having the anti-counterfeiting structure, a authenticity identification device for discriminating the authenticity of the paper leaves, and a authenticity identification method. The present invention relates to a paper leaf processing device provided with a authenticity identification device.

Conventionally, an anti-counterfeit structure has been used to prevent counterfeiting of paper leaves. For example, Patent Document 1 discloses a technique of utilizing a hologram, which is one of OVD (Optical Variable Device), as an anti-counterfeit structure. A seal-type hologram or a transfer foil hologram is attached as an anti-counterfeit structure to valuable media such as checks, banknotes, and gift certificates. Holograms whose design changes depending on the viewing angle cannot be reproduced by copying with a copier or the like and are difficult to manufacture, so they are effective in preventing forgery of paper leaves.

Japanese Unexamined Patent Publication No. 2004-223975

However, some conventional anti-counterfeiting structures are not suitable for machine identification by the device. For example, when a human visually confirms a hologram, the hologram can be tilted to easily confirm a change in design, but a complicated mechanism is required to realize this in the device.

The present invention has been made in view of the above-mentioned problems of the prior art, and is an anti-counterfeit structure having a structure suitable for machine identification, a paper leaf provided with the anti-counterfeit structure, and a true paper leaf. It is an object of the present invention to provide a truth identification device for discriminating falsehood, a truth discrimination method, and a paper leaf processing device provided with the truth discrimination device.

In order to solve the above-mentioned problems and achieve the object, the present invention is an anti-counterfeiting structure for preventing counterfeiting of paper sheets, and a plurality of regions having different transmittances of invisible light having a predetermined wavelength. A first layer having a predetermined design formed by the above layer, and a design that is provided above the first layer and is capable of transmitting the invisible light transmitted through the first layer and is different from the first layer can be visually formed. It is characterized by having a second layer.

Further, the present invention is characterized in that, in the above invention, the first layer includes a region that transmits the invisible light and a region that does not transmit the invisible light.

Further, in the present invention, in the above invention, the first layer has a region that transmits invisible light of the first wavelength and a second wavelength that does not transmit the invisible light of the first wavelength and is different from the first wavelength. It is characterized by including a region that transmits invisible light.

Further, in the present invention, in the above invention, the first layer has a region that transmits invisible light of the first wavelength and invisible light of the second wavelength different from the first wavelength, and the invisible of the first wavelength. It is characterized by including a region that does not transmit light but transmits invisible light of the second wavelength.

Further, the present invention is characterized in that, in the above invention, the first layer is formed by a plurality of types of inks having different transmittances of invisible light.

Further, in the present invention, the visible light reflection image obtained by irradiating visible light from above the second layer in the above invention includes the design of the second layer and is obtained by irradiating the invisible light. The invisible light transmission image is characterized by including the design of the first layer.

Further, the present invention is characterized in that, in the above invention, the design formed on the first layer includes at least one of a character, a number, a symbol, and a pattern.

Further, the present invention is characterized in that, in the above invention, the first layer does not transmit visible light.

Further, the present invention is characterized in that, in the above invention, the second layer is a layer in which a predetermined design is printed on a material that transmits visible light.

Further, the present invention is characterized in that, in the above invention, the second layer is a hologram.

Further, the present invention is characterized in that, in the above invention, the hologram includes the visible light and the metal layer that does not transmit the invisible light, and the metal layer is processed to transmit the invisible light. And.

Further, the present invention is characterized in that, in the above invention, the metal layer includes a region that has been processed to transmit the invisible light and a region that has not been processed.

Further, the present invention is characterized in that, in the above invention, the second layer does not transmit visible light.

Further, the present invention is characterized in that, in the above invention, the second layer is a layer in which a predetermined design is printed on the upper surface of the material that does not transmit visible light.

Further, the present invention is characterized in that the above invention further includes a filter layer that does not transmit visible light and transmits the invisible light.

Further, in the present invention, in the above invention, the first layer is a metal layer forming a hologram, the second layer is a regenerated layer forming the hologram, and the invisible light is applied to the metal layer. It is characterized in that a predetermined design of the first layer is formed by a region that has been subjected to a transparent processing and a region that has not been subjected to the processing.

Further, the present invention is characterized in that, in the above invention, the filter layer that does not transmit the visible light and transmits the invisible light is further provided.

Further, the present invention is characterized in that, in the above invention, the invisible light is infrared light.

Further, the present invention is characterized in that it is a paper leaf and includes an anti-counterfeit structure according to the above invention.

Further, the present invention is a banknote and is characterized by comprising an anti-counterfeit structure according to the above invention.

Further, the present invention is a authenticity identification device, and a light source for irradiating invisible light on paper sheets having an anti-counterfeit structure according to the above invention and data of invisible light transmitted through the paper sheets are used. It is characterized by including a transmission sensor to be acquired and a discriminating unit for discriminating the authenticity of the paper sheets by comparing the invisible light transmission data acquired by the transmission sensor with the reference data prepared in advance. do.

Further, the present invention is a paper leaf processing apparatus, which comprises the authenticity identification apparatus according to the above invention, and is characterized in that paper leaves are processed based on the identification result by the authenticity identification apparatus.

Further, the present invention is a true / false identification method for mechanically identifying the authenticity of paper leaves, which comprises a step of irradiating paper leaves having an anti-counterfeiting structure according to the present invention with invisible light, and the paper leaves. It includes a step of acquiring invisible light data transmitted through the class and a step of identifying the authenticity of the paper sheet by comparing the acquired invisible light transmitted data with the reference data prepared in advance. It is a feature.

According to the present invention, the design of the anti-counterfeit structure visually confirmed under visible light is different from the design included in the transmitted image obtained by irradiating the anti-counterfeit structure with invisible light of a predetermined wavelength. This can be used to prevent counterfeiting of paper leaves with an anti-counterfeit structure. For example, even when the anti-counterfeit structure is configured by using a hologram that cannot obtain a stable visible light reflection image at the time of machine identification, an invisible light transmission image having a predetermined design can be obtained, so that the invisible light transmission image can be used. Stable machine identification based on this is possible. This improves the security of the paper leaves with the anti-counterfeit structure.

FIG. 1 is a schematic diagram for explaining the structure of the anti-counterfeit structure according to the present embodiment. FIG. 2 is a diagram showing an example of how to apply two types of ink. FIG. 3 is a diagram showing the types of images obtained by irradiating the anti-counterfeit structure with light. FIG. 4 is a block diagram showing a configuration example of a bill processing device. FIG. 5 is a diagram showing a configuration example of an anti-counterfeit structure. FIG. 6 is a schematic diagram for explaining the structure of the anti-counterfeit structure in which the second layer is a hologram. FIG. 7 is a schematic diagram for explaining another structure of the anti-counterfeit structure in which the second layer is a hologram. FIG. 8 is a schematic diagram for explaining the structure of the anti-counterfeit structure in which the first layer and the second layer are holograms. FIG. 9 is a schematic diagram for explaining an example of using two types of infrared light having different wavelengths.

Hereinafter, the anti-counterfeit structure, paper sheets, authenticity identification device, authenticity identification method, and paper leaf processing apparatus according to the present invention will be described with reference to the accompanying drawings. Paper sheets that prevent counterfeiting by using anti-counterfeiting structures are of the type if a transmitted image of the anti-counterfeiting structure can be obtained when irradiated with invisible light (electromagnetic waves other than visible light) of a predetermined wavelength. And the structure are not particularly limited. For example, anti-counterfeiting structures can be attached to banknotes, checks, gift certificates, admission tickets, warranty cards, and certificates to prevent counterfeiting. In this embodiment, an anti-counterfeit structure, paper sheets, authenticity identification device, authenticity identification method, and paper leaf processing apparatus will be described using banknotes as an example.

First, an outline of the anti-counterfeit structure according to the present embodiment will be described. The anti-counterfeit structure has a non-visible light design layer (first layer) that can obtain a transmitted image including a predetermined design when irradiated with non-visible light of a predetermined wavelength, and a transmission of the non-visible light design layer under visible light. It includes a visible light design layer (second layer) that allows visually confirming a predetermined design different from the image. The anti-counterfeit structure also includes a filter layer that blocks the transmission of visible light between the front and back surfaces of the anti-counterfeit structure and allows the transmission of invisible light through the invisible light design layer. .. The filter layer may be provided independently of the visible light design layer and the invisible light layer, or at least one of the visible light design layer and the invisible light design layer may also serve as the filter layer. There may be.

When the anti-counterfeit structure is irradiated with visible light, a visible light reflection image including the design of the visible light design layer can be obtained. When the anti-counterfeit structure is irradiated with invisible light, an invisible light transmission image including the design of the invisible light design layer is obtained. The visible light reflection image and the invisible light transmission image are different images. When the anti-counterfeit structure is irradiated with visible light, the filter layer blocks the transmission of visible light. Therefore, the visible light transmission image is different from the invisible light transmission image. That is, the image content of the invisible light transmission image cannot be confirmed under visible light.

When the anti-counterfeit structure is attached to the surface of the banknote, the visible light design layer is above the non-visible light design layer. The invisible light design layer is sandwiched between the bill surface and the visible light design layer. Therefore, when the surface of the banknote is viewed under visible light, the design of the visible light design layer can be visually confirmed, but the design of the non-visible light design layer cannot be visually confirmed. That is, the visible light design layer functions as a layer that hides the design of the non-visible light design layer from the viewer of the banknote surface.

The filter layer is provided so that the design of the visible light design layer can be visually confirmed from the front surface side of the banknote and the design of the invisible light design layer cannot be confirmed from the back surface side of the banknote. For example, a filter layer is provided between the visible light design layer and the invisible light design layer, or below the invisible light design layer. Since the filter layer does not transmit visible light, the design of the invisible light design layer cannot be visually confirmed even when viewed from the back side of the banknote. For example, when the filter layer is formed so as to cover the entire invisible light design layer, the visible light transmission image becomes an image filled with a single color such as black, and the design of the invisible light design layer cannot be confirmed. That is, the filter layer functions as a layer that hides the design of the invisible light design layer from a person who sees through the banknote from the back surface side. If the design of the invisible light design layer cannot be confirmed, the filter layer is not limited to hiding the entire design of the invisible light design layer, but partially hides the design of the invisible light design layer. You may.

When a person looks at a banknote under visible light, the same content as the visible light reflection image can be visually confirmed. It is also possible to visually confirm the same contents as the visible light transmission image. When a person judges the authenticity of a banknote, he / she looks at the anti-counterfeit structure from the surface side of the banknote and confirms whether or not the design of the visible light design layer can be visually confirmed. Also, when viewed from the back side of the bill, it is confirmed whether or not the appearance is different from that when viewed from the front side. For example, if the design of the visible light design layer can be confirmed when viewed from the front side, and this design cannot be confirmed from the back side, it can be determined that the banknote is a true banknote.

When the authenticity identification device mechanically identifies the authenticity of a banknote, an invisible light transmission image obtained by irradiating invisible light is used. Specifically, the authenticity of the banknote can be identified based on whether or not an invisible light transmission image including the design of the invisible light design layer is obtained. In addition to the invisible light transmission image, at least one of the visible light reflection image and the visible light transmission image can be used for authenticity discrimination. Specifically, at least one of whether or not a visible light reflection image including the design of the visible light design layer is obtained and whether or not a visible light transmission image different from the visible light reflection image and the invisible light transmission image can be obtained. One can be added to the determination of authenticity identification. For example, even if the visible light design layer is realized by using a hologram in which a stable reflected image cannot be obtained by a conventional device, it is possible to provide a non-visible light design layer separately from the hologram or in the hologram. Stable machine identification based on visible light transmission images is possible. For example, the invisible light design layer is realized by using the metal layer of the hologram, which will be described in detail later.

The wavelength of the invisible light referred to in the present embodiment is not particularly limited as long as it is an electromagnetic wave having a predetermined wavelength. Hereinafter, infrared light having a predetermined wavelength (hereinafter, simply referred to as “infrared light”) will be described as an example. The design referred to in the present embodiment is configured to include at least one of letters, numbers, symbols, and patterns, and the content is not particularly limited. In the following, a design consisting of a predetermined pattern will be described as an example. Regarding the banknotes, of the two banknote faces, the banknote side to which the anti-counterfeit structure is attached will be described as the front surface, and the other banknote surface will be described as the back surface.

FIG. 1 is a schematic diagram for explaining the structure of the anti-counterfeit structure 1 according to the present embodiment. FIGS. 1 (a) to 1 (d) show Cartesian coordinates so that the relationship between the figures can be understood. The lower layer shown in FIG. 1B is the first layer 10, and the layer formed on the first layer 10 is the second layer 20. The second layer 20 is a visible light design layer formed so that a predetermined pattern can be visually observed under visible light. The first layer 10 is an infrared light design layer formed so that a predetermined pattern different from that of the second layer 20 can be confirmed when infrared light is transmitted.

FIG. 1A shows a banknote 2 to which the anti-counterfeit structure 1 is attached. Specifically, the anti-counterfeit structure 1 having an adhesive layer under the first layer 10 is attached to the surface of the bill 2. For example, the anti-counterfeit structure 1 formed in the shape of a sticker may be attached to the bill 2, or the anti-counterfeit structure 1 formed in the shape of a transfer foil may be transferred to and attached to the bill 2. May be good. The adhesive strength between the first layer 10 and the second layer 20 is stronger than the adhesive strength between the first layer 10 and the bill 2, that is, between the anti-counterfeit structure 1 and the bill 2. When the anti-counterfeit structure 1 is to be peeled off from the bill 2, the first layer 10 and the second layer 20 are not separated, and the anti-counterfeit structure 1 is peeled off from the bill 2.

FIG. 1B shows a cross section of the anti-counterfeit structure 1 shown in FIG. 1A as viewed from the side (Y-axis negative direction side). The second layer 20 covers the entire area of the first layer 10. The anti-counterfeit structure 1 is, for example, a thin structure having an overall thickness of several hundred μm or less.

The second layer 20 is a layer that transmits visible light and transmits infrared light. As shown in FIG. 1 (c), the second layer 20 is provided with a design of a predetermined pattern that can be confirmed under visible light. For example, the second layer 20 is a transparent film on which the geometric pattern shown in FIG. 1C is printed.

As shown in FIGS. 1 (b) and 1 (d), the first layer 10 includes two types of regions having different infrared light transmittances. One is an infrared light opaque region 10a that does not transmit infrared light. The other is an infrared light transmission region 10b that transmits infrared light. In FIG. 1, the infrared light transmissive region 10a is shown by painting it in black, and the infrared light transmissive region 10b is shown by diagonal lines. The infrared light opaque region 10a and the infrared light transmission region 10b do not transmit visible light. That is, the first layer 10 functions as a filter layer that does not transmit visible light. The first layer 10 is a layer that does not transmit visible light in the entire area and transmits infrared light in a part of the region. As shown in FIG. 1 (d), the first layer 10 is provided with a predetermined pattern design using the infrared light opaque region 10a and the infrared light transmission region 10b. As described above, by forming the pattern by a plurality of regions having different infrared light transmittances, a contrast difference that can distinguish each region is generated on the transmitted image obtained by irradiating the infrared light. The pattern of the first layer 10 can be confirmed by this contrast difference.

For example, the infrared light opaque region 10a is formed of an infrared reflective ink or an infrared absorbing ink that does not transmit visible light and infrared light. The infrared light transmission region 10b is formed of an infrared transmission ink that does not transmit visible light but transmits infrared light. In FIG. 1, the infrared light opaque region 10a and the infrared light transmission region 10b are shown so as to be distinguishable, but in reality, for example, both regions are formed of black ink. Therefore, even if the second layer 20 is made of a transparent material, it is difficult to visually confirm the pattern shown in FIG. 1D under visible light. In addition, as shown in FIG. 1 (c), the second layer 20 having a different pattern covers the first layer 10, so that the pattern of the first layer 10 cannot be visually confirmed.

FIG. 1B shows an example in which the infrared light opaque region 10a and the infrared light transmission region 10b are painted separately so that two types of inks having different infrared light transmittances do not overlap. The method of painting is not limited to this. FIG. 2 is a diagram showing an example of how to apply two types of ink. As shown in FIG. 2A, an infrared light opaque region 10a is formed by an infrared light reflecting ink or an infrared light absorbing ink, and an infrared light transmitting ink is applied over the infrared light transmitting region 10a. It may be an embodiment of forming 10b. As shown in FIG. 2B, an infrared light transmitting region 10b is formed by an infrared light transmitting ink, and an infrared light opaque region 10a is formed on the infrared light transmitting region 10b by an infrared light reflecting ink or an infrared light absorbing ink. It may be an embodiment of the above.

FIG. 3 is a diagram showing the types of images obtained by irradiating the anti-counterfeit structure 1 with light. FIG. 3A shows a visible light reflection image 21 and a visible light transmission image 22 obtained by irradiating visible light from the surface side of the bill 2. FIG. 3B shows an infrared light transmission image 11 obtained by irradiating infrared light from the surface side of the bill 2.

As shown in FIG. 3A, the visible light reflection image 21 is an image including the pattern of the second layer 20 shown in FIG. 1C. As shown by the arrow in FIG. 3A, visible light cannot pass through the first layer 10. Therefore, the visible light transmission image 22 is different from the visible light reflection image 21. Specifically, the image does not include the pattern of the second layer 20. In reality, the visible light transmission image 22 may include a pattern printed on the back surface of the banknote 2 due to the influence of ambient light or the like, but in order to simplify the explanation, FIG. 3 (a) shows. The entire area is filled with a single color.

Infrared light passes through the second layer 20. As shown by the arrow in FIG. 3B, the infrared light transmitted through the second layer 20 cannot pass through the infrared light opaque region 10a and can pass through the infrared light transmitting region 10b. Therefore, as shown in FIG. 3B, the infrared light transmission image 11 is an image including the pattern of the first layer 10 shown in FIG. 1D. The infrared light transmission image 11 is different from the visible light reflection image 21, and is also different from the visible light transmission image 22. FIG. 3B shows an example in which infrared light is irradiated from the front surface side of the bill 2 to obtain an infrared light transmission image 11 on the back surface side, but infrared light is irradiated from the back surface side of the bill 2. The same image is obtained when the infrared light transmission image 11 is obtained on the surface side.

In this way, the anti-counterfeit structure 1 is irradiated with visible light and infrared light, and as shown in FIG. 3, there are three types of visible light reflecting image 21, visible light transmitting image 22, and infrared light transmitting image 11. You can get different images of. For example, when a person confirms the authenticity of the banknote 2, whether or not the surface of the banknote 2 can be visually confirmed under visible light to confirm the predetermined pattern of the second layer 20 shown in FIG. 1 (c). The authenticity of the bill 2 can be determined based on this.

It is also possible to identify the authenticity of the bill 2 by machine identification by the device. FIG. 4 is a block diagram showing a configuration example of the bill processing device 100. The banknote processing device 100 shown in FIG. 4A and the banknote processing device 100 shown in FIG. 4B differ only in the configuration of the authenticity identification device 170 (170a, 170b). Specifically, the authenticity identification device 170a shown in FIG. 4A has one light source 180 and two sensors 191 and 192. The authenticity identification device 170b shown in FIG. 4B has two light sources 181 and 182 and one sensor 193.

The banknote processing device 100 shown in FIGS. 4A and 4B includes an input port 110, a transport unit 120, a discharge port 130, a storage unit 140, a control unit 150, an operation display unit 160, and a authenticity identification device 170. The operation display unit 160 is composed of, for example, a touch panel type liquid crystal display device. The operation display unit 160 functions as an operation unit for performing setting operations and instruction operations related to bill processing. The operation display unit 160 also functions as a display unit that displays various information related to bill processing on the liquid crystal screen. The control unit 150 receives an operation on the operation display unit 160 and controls the input port 110, the transport unit 120, the discharge port 130, the storage unit 140, and the authenticity identification device 170 while displaying various information on the screen. As a result, the bill processing device 100 can perform various bill processing. Banknote processing includes, for example, deposit processing and withdrawal processing.

The slot 110 receives a plurality of banknotes at the time of deposit processing, and pays out the banknotes one by one into the device of the banknote processing device 100. The transport unit 120 transports the banknotes fed into the device along the transport path. The input port 110, the authenticity identification device 170, the discharge port 130, and the storage unit 140 are connected by a transport path. The discharge port 130 discharges the banknotes carried by the transport unit 120. The bills discharged to the discharge port 130 can be taken out to the outside of the bill processing device 100. The storage unit 140 has, for example, a plurality of storage units for storing banknotes by type. The storage unit 140 has a function of feeding out the banknotes accumulated in each collection unit to the transport path. At the time of withdrawal processing, the banknotes drawn out from the storage unit 140 are conveyed along the transport path and discharged from the discharge port 130.

The authenticity identification device 170a shown in FIG. 4A identifies banknotes to be conveyed by the transfer unit 120. For example, the denomination, authenticity, correctness and loss, and direction of the bill are identified. The banknotes identified by the authenticity identification device 170 are ejected from the discharge port 130 or stored in the storage unit 140 based on the identification result. At the time of deposit processing, banknotes that the authenticity identification device 170 does not identify as true banknotes are discharged to the discharge port 130 as rejected banknotes. The banknotes identified by the authenticity identification device 170 as true banknotes are classified and accumulated in the accumulation unit of the storage unit 140 according to the type based on the identification result.

The authenticity identification device 170a shown in FIG. 4A includes a light source 180, a reflection sensor 191 and a transmission sensor 192, and a control unit 200. The light source 180 is arranged above the transport path in which the transport unit 120 transports banknotes. The light source 180 irradiates the banknotes transported along the transport path with visible light. The light source 180 can also irradiate the bill with infrared light.

The reflection sensor 191 is arranged above the transport path, offset from the position where the light source 180 is arranged in the extending direction of the transport path. The reflection sensor 191 is composed of, for example, a line sensor, and acquires a reflection image by capturing an image of banknotes transported along a transport path. By irradiating visible light from the light source 180, a visible light reflection image can be acquired by using the reflection sensor 191.

The transmission sensor 192 is arranged below the transport path and at a position facing the light source 180 across the transport path. The transmission sensor 192 is composed of, for example, a line sensor, and acquires a transmission image by capturing an image of banknotes transported along a transport path. By irradiating visible light from the light source 180, a visible light transmission image can be acquired by using the transmission sensor 192. By irradiating infrared light from the light source 180, an infrared light transmission image can be acquired by using the transmission sensor 192.

The control unit 200 obtains information from the transport unit 120 and recognizes the timing at which the banknote reaches the image pickup region by the transmission sensor 192 and the timing at which the bill reaches the image pickup region by the reflection sensor 191. The control unit 200 controls each unit according to the timing at which the banknotes transported in the transport path pass through the authenticity identification device 170.

The control unit 200 irradiates visible light from the light source 180 while the banknote passes through the image pickup region of the reflection sensor 191 to acquire a visible light reflection image of the banknote. Further, the control unit 200 irradiates infrared light from the light source 180 while the banknote passes through the image pickup region of the transmission sensor 192 to acquire an infrared light transmission image of the banknote. While the banknote passes through the image pickup region of the transmission sensor 192, the banknote is repeatedly irradiated while switching between visible light and infrared light. Thereby, the visible light line data and the infrared light line data can be acquired, and two types of transmitted images, a visible light transmitted image and an infrared light transmitted image, can be acquired.

As shown in FIG. 1, the authenticity identification device 170a acquires the visible light reflection image 21, the visible light transmission image 22, and the infrared light transmission image 11 shown in FIG. 3 from the bill 2 having the anti-counterfeit structure 1. .. The control unit 200 of the authenticity identification device 170a identifies the authenticity of the bill 2 based on the infrared light transmission image 11. Alternatively, the control unit 200 identifies the authenticity of the bill 2 based on at least one of the visible light reflection image 21 and the visible light transmission image 22 and the infrared light transmission image 11. That is, the control unit 200 functions as a discriminating unit for discriminating the authenticity of the bill 2. The authenticity identification process is performed by comparing the data obtained from the bill 2 with the reference data prepared in advance.

The difference between the authenticity identification device 170b shown in FIG. 4B and the authenticity identification device 170 shown in FIG. 4A will be described. The authenticity identification device 170b shown in FIG. 4B includes a visible light light source 181 that irradiates a banknote with visible light, an infrared light source 182 that irradiates the banknote with infrared light, and a visible light image and an infrared light image. With a sensor 193 capable of acquiring the light source. The sensor 193 comprises, for example, a line sensor. The visible light light source 181 and the sensor 193 are arranged above the transport path and shifted in the extending direction of the transport path. The infrared light source 182 is arranged below the transport path and at a position facing the sensor 193 across the transport path.

By irradiating visible light from the visible light light source 181, a visible light reflection image can be acquired by using the sensor 193. By irradiating infrared light from the infrared light source 182, an infrared light transmission image can be acquired by using the sensor 193.

While the banknote passes through the image pickup region by the sensor 193, the visible light irradiation by the visible light light source 181 and the infrared light irradiation by the infrared light source 182 are repeatedly executed while switching. A visible light reflection image is generated from the line data acquired by the sensor 193 during visible light irradiation. An infrared light transmission image is generated from the line data acquired by the sensor 193 during infrared light irradiation.

As shown in FIG. 1, the authenticity identification device 170b acquires the visible light reflection image 21 and the infrared light transmission image 11 shown in FIG. 3 from the bill 2 having the anti-counterfeit structure 1. The control unit 200 of the authenticity identification device 170b identifies the authenticity of the bill 2 based on the infrared light transmission image 11. Alternatively, the control unit 200 identifies the authenticity of the bill 2 based on the infrared light transmission image 11 and the visible light reflection image 21. That is, the control unit 200 functions as a discriminating unit for discriminating the authenticity of the bill 2. The authenticity identification process is performed by comparing the data obtained from the bill 2 with the reference data prepared in advance.

The bill processing device 100 shown in FIG. 4 executes the discharge of the bill 2 into the discharge port 130 and the storage of the bill 2 in the storage unit 140 based on the identification result by the authenticity identification device 170. The authenticity identification device 170 is not limited to the mode of determining the authenticity of the banknote 2, and the banknote processing device 100 identifies the authenticity of the banknote 2 by using the image obtained by the authenticity identification device 170. It may be an embodiment. Further, the bill processing device 100 is an embodiment in which the authenticity of the bill 2 is finally determined based on the authenticity identification result obtained by using the authenticity identification device 170 and the information obtained by another sensor. You may.

If an image can be obtained from the anti-counterfeit structure 1 on the banknote 2 as shown in FIG. 3, the configuration of the anti-counterfeit structure 1 is not limited to the structure shown in FIG. Hereinafter, another example of the anti-counterfeit structure 1 will be described.

FIG. 5 is a diagram showing a configuration example of the anti-counterfeit structure 1. 5 (a) to 5 (d) show the function of each layer and an example of each layer realizing the function for a plurality of layers constituting the anti-counterfeit structure 1.

In the configuration shown in FIG. 5A, the first layer 10 forms an infrared light pattern by the infrared light opaque region 10a and the infrared light transmission region 10b, and the second layer 20 forms an infrared light pattern under visible light. It shows a configuration that forms a visible visible light pattern and functions as a filter layer. For example, the second layer 20 of the anti-counterfeit structure 1 shown in FIG. 1 is an opaque film in which the pattern shown in FIG. 1 (c) is printed on the upper surface. Even when the second layer 20 is an opaque film, three types of images shown in FIG. 3 can be obtained. In this configuration, since the second layer 20 functions as a filter layer, the two types of inks forming the first layer 10 may transmit visible light.

The configuration shown in FIG. 5B shows a configuration in which the first layer 10 forms an infrared light pattern and functions as a filter layer, and the second layer 20 forms a visible light pattern. The anti-counterfeit structure 1 shown in FIG. 1 is an example of this configuration.

For example, the case where the second layer 20 of the anti-counterfeit structure 1 shown in FIG. 1 is used as a hologram also corresponds to this configuration. FIG. 6 is a schematic diagram for explaining the structure of the anti-counterfeit structure 1 in which the second layer 220 is a hologram. In this example, the pattern shown in FIG. 1 (c) is realized by the hologram.

As shown in FIG. 6, the hologram of the second layer 220 includes a reproduction layer 221 for reproducing the recorded image and a metal layer 222 for reflecting visible light entering the reproduction layer 221. The reproduction layer 221 transmits visible light and infrared light. The metal layer 222 is made of a metal material that does not transmit visible light and infrared light, but by forming a large number of micropores penetrating in the vertical direction in the metal layer 222, infrared light can be transmitted. There is. As shown in FIG. 6, even when the second layer 220 is a hologram, the three types of images shown in FIG. 3 can be obtained by subjecting the entire area of the second layer 220 to micropore processing for transmitting infrared light. be able to.

In the configuration shown in FIG. 5 (c), the first layer 10 forms a part of the infrared light pattern and functions as a filter layer, and the second layer 20 forms a part of the infrared light pattern and the visible light pattern. The configuration to be formed is shown. For example, this configuration can be realized by a configuration in which the second layer 20 of the anti-counterfeit structure 1 shown in FIG. 1 is used as a hologram.

FIG. 7 is a schematic diagram for explaining another structure of the anti-counterfeit structure 1 in which the second layer 220 is a hologram. As shown in FIG. 7, the metal layer 223 included in the hologram of the second layer 220 is divided into two regions, an inner peripheral region 223a and an outer peripheral region 223b. Similar to the metal layer 222 shown in FIG. 6, the inner peripheral region 223a is subjected to a large number of micropore processing so as to transmit infrared light. On the other hand, the outer peripheral region 223b is not subjected to micropore processing and does not transmit infrared light. That is, the inner peripheral region 223a functions as an infrared light transmitting region, and the outer peripheral region 223b functions as an infrared light opaque region. As a result, the metal layer 223, that is, the second layer 220 forms a part of the infrared light pattern appearing in the infrared light transmission image.

As shown in FIG. 7, the first layer 210 is divided into three strip-shaped regions 210a to 210c parallel to the minor axis of the elliptical shape. The center is an infrared light transmissive region 210a, and the two outer regions are infrared light transmissive regions 210b. The first layer 210 also forms a part of the infrared light pattern appearing in the infrared light transmission image.

The infrared light transmission regions 210b on both outer sides of the first layer 10 are regions that transmit infrared light, but the infrared light emitted from the surface side of the banknote 2, that is, from above the anti-counterfeit structure 1, is emitted. It does not reach the first layer 10, which allows the outer peripheral region 223b of the second layer 220 to pass through. Therefore, the infrared light transmitted through the second layer 220 forms an infrared light pattern that can distinguish the inner peripheral region 223a and the outer peripheral region 223b. Further, the infrared light transmitted through the inner peripheral region 223a of the second layer 220 is transmitted through the first layer 210, so that the infrared light opaque region 210a and the infrared light transmitting region 210b can be distinguished from each other. A pattern is formed. The infrared light pattern shown in FIG. 1D is realized by synthesizing the infrared light pattern formed by the second layer 220 and the infrared light pattern formed by the first layer 10. As a result, even when the anti-counterfeit structure 1 has the structure shown in FIG. 7, three types of images shown in FIG. 3 can be obtained.

The configuration shown in FIG. 5D shows a configuration in which the reproduction layer of the hologram is the first layer, the metal layer of the hologram is the second layer, and a filter layer is provided separately from the hologram. For example, a filter that forms the infrared light pattern shown in FIG. 1D by the metal layer 223 of the hologram shown in FIG. 7 and transmits infrared light below the metal layer 223 without transmitting visible light. By providing the layer, this configuration can be realized.

FIG. 8 is a schematic diagram for explaining the structure of the anti-counterfeit structure 1 in which the first layer and the second layer are the hologram 300. The hologram 300 includes a reproduction layer 320 for reproducing the recorded image and a metal layer 310 for reflecting visible light that has entered the reproduction layer 320.

The reproduction layer 320 transmits visible light and infrared light. The visible light pattern shown in FIG. 1 (c) is recorded on the reproduction layer 320. That is, the regenerated layer 320 functions as a second layer in which the visible light pattern shown in FIG. 1 (c) is formed so that it can be visually confirmed under visible light.

The metal layer 310 includes an infrared light opaque region 310a that does not transmit infrared light and an infrared light transmission region 310b that transmits infrared light. Similar to the hologram shown in FIG. 7, the region without micropore processing is the infrared light opaque region 310a, and the region with micropore processing to transmit infrared light is infrared light transmission. Region 310b. As shown in FIG. 8, in the metal layer 310, the infrared light pattern shown in FIG. 1D is formed by the infrared light opaque region 310a and the infrared light transmission region 310b. That is, the metal layer 310 of the hologram 300 functions as a first layer for forming an infrared light pattern.

As shown in FIG. 8, the filter layer 400 is provided below the hologram 300, that is, below the metal layer 310. The filter layer 400 is formed of, for example, an infrared transmissive ink that does not transmit visible light but transmits infrared light.

As described above, even when the first layer and the second layer are the hologram 300, a part of the metal layer 310 functioning as the first layer is subjected to micropore processing to form an infrared light pattern, and the hologram 300 is formed. By providing the filter layer 400 on the lower side, three types of images shown in FIG. 3 can be obtained. Specifically, as shown in FIG. 8, the hologram 300 composed of the reproduction layer 320 and the metal layer 310 provides the visible light reflection image 21 similar to that in FIG. Further, the metal layer 310 obtains the infrared light transmission image 11 similar to FIG. 3, and the filter layer 400 obtains the visible light transmission image 22 similar to FIG. When the anti-counterfeit structure 1 is viewed from the front side under visible light, the same content as the visible light reflection image 21 is visually confirmed, and when viewed from the back side, the same content as the visible light transmission image 22 is visually confirmed. It will be.

As shown in FIGS. 6 and 7, when the anti-counterfeit structure 1 contains a hologram, the image content of the visible light reflection image acquired by the authenticity identification device 170 shown in FIG. 4 is not stable, and the banknote 2 on the transport path 2 There is a possibility that the image may be different or the image may be overexposed depending on the transport state of the image. Even in such a case, since the infrared light transmission image 11 is stably obtained, the authenticity of the bill 2 can be identified based on the infrared light transmission image 11.

When the hologram cannot be used for machine identification as in the conventional device, for example, the true banknote 2 from which the hologram has been peeled off is used by deceiving the device for machine identification, and the hologram peeled off from the true banknote 2 is used as the banknote 2. Fake banknotes pasted on copies can be used by deceiving people. By making the anti-counterfeit structure 1 have the structure shown in FIG. 6 or 7, the authenticity identification device 170 can detect the true banknote 2 from which the anti-counterfeit structure 1 has been peeled off. In addition, the authenticity identification device 170 can also detect a fake banknote to which the anti-counterfeit structure 1 is attached. By identifying the authenticity of a banknote by using the authenticity identification device 170 or the banknote processing device 100 provided with the authenticity identification device 170, it is possible to prevent the use of forged banknotes.

Up to this point, an example of acquiring an infrared light transmission image using one type of infrared light has been described, but an embodiment may use a plurality of types of infrared light having different wavelengths. FIG. 9 is a schematic diagram for explaining an example of using two types of infrared light having different wavelengths. FIG. 9 is different from the example shown in FIG. 1 in that the two infrared light transmission regions 10b and 10c constituting the first layer 10 transmit infrared light having different wavelengths.

For example, the infrared light transmission region 10b shown in FIG. 9A is a region that transmits infrared light of the first wavelength but does not transmit infrared light of the second wavelength. On the other hand, the infrared light transmission region 10c is a region that does not transmit infrared light of the first wavelength but transmits infrared light of the second wavelength. For example, by changing the type of ink forming each region, it is possible to realize a plurality of types of regions having different wavelength ranges transmitted in this way. In this case, when the anti-counterfeit structure 1 is irradiated with infrared light of the first wavelength, the infrared light transmission image shown on the left side of FIG. 9B is obtained. Further, when the anti-counterfeit structure 1 is irradiated with infrared light having a second wavelength, the infrared light transmission image shown on the left side of FIG. 9B can be obtained.

Further, for example, the infrared light transmission region 10b shown in FIG. 9A is a region that transmits both infrared light of the first wavelength and infrared light of the second wavelength. On the other hand, the infrared light transmission region 10c is a region that transmits only infrared light of the second wavelength. In this case, when the anti-counterfeit structure 1 is irradiated with infrared light of the first wavelength, the infrared light transmission image shown on the left side of FIG. 9C is obtained. Further, when the anti-counterfeit structure 1 is irradiated with infrared light having a second wavelength, the infrared light transmission image shown on the right side of FIG. 9 can be obtained.

In this way, by making the anti-counterfeit structure 1 a structure in which different transmitted images can be obtained when each of a plurality of types of infrared light having different wavelengths is irradiated, the anti-counterfeiting effect of the anti-counterfeit structure 1 can be obtained. It can be further enhanced.

By configuring the light source 180 shown in FIG. 4A to irradiate a plurality of types of infrared light having different wavelengths, the authenticity identification device 170a has a plurality of types shown in FIGS. 9B and 9C. Infrared light transmission image can be acquired. Similarly, by configuring the infrared light source 182 shown in FIG. 4 (b) to irradiate a plurality of types of infrared light having different wavelengths, the authenticity identification device 170b can be used in FIGS. 9 (b) and 9 (c). ) Can be obtained for a plurality of types of infrared light transmission images. The authenticity identification device 170 discriminates the authenticity of banknotes by comparing a plurality of types of infrared light transmission images obtained by irradiating infrared light of each wavelength with reference data prepared in advance. be able to. Further, the banknote processing device 100 can process banknotes based on the identification result by the authenticity identification device 170.

In the present embodiment, the anti-counterfeit structure 1 is composed of two layers, but if the function of the anti-counterfeit structure 1 described above can be realized, the number of layers constituting the anti-counterfeit structure 1 is particularly large. Not limited. For example, the first layer 10 of the anti-counterfeit structure 1 shown in FIG. 1B is a layer that does not transmit visible light and exhibits a predetermined pattern when infrared light is transmitted. The first layer 10 is divided into a layer that does not transmit visible light and a layer that shows a predetermined pattern when infrared light is transmitted, and the anti-counterfeit structure 1 is formed by adding the second layer 20 to these two layers. It may be a structure. Further, for example, the second layer 20 of the anti-counterfeit structure 1 shown in FIG. 5A is a layer that does not transmit visible light and shows a predetermined pattern under visible light. The second layer 20 is divided into a layer in which a predetermined pattern is printed on a transparent film that transmits visible light and a layer that does not transmit visible light. It may be an embodiment having a three-layer structure in which the above is added.

In the present embodiment, for the sake of simplicity, the minimum configuration constituting the anti-counterfeit structure 1 is shown, but if the function of the anti-counterfeit structure 1 described above can be realized, the anti-counterfeit structure 1 is shown. May have an embodiment having another layer. For example, an adhesive layer or a protective layer may be provided between the first layer 10 and the second layer 20. Further, for example, a mode in which a protective layer is provided on the second layer 20 may be used.

In the present embodiment, for the sake of simplicity, it is described that light passes through or does not pass through each layer, but this does not limit the transmittance of light to 100% or 0%. The region that transmits light is a region in which the transmittance of light is higher than that of a region that does not transmit light, and the transmittance of the region that does not transmit light does not have to be 0%. The transmittance of the region that transmits light does not have to be 100%. For example, of the two types of regions having different light transmittances, a region having a high transmittance is a region that transmits light, and a region having a low transmittance is a region that does not transmit light. Specifically, the value of the transmittance is not particularly limited as long as a plurality of types of images can be obtained as shown in FIGS. 3 and 6 to 9. In the examples of FIGS. 1 to 3, the transmittance of infrared light differs between the infrared light opaque region 10a and the infrared light transmitting region 10b, and the infrared light transmitting image 11 shown in FIG. 3 shows FIG. 1 (d). If the pattern shown in 1 can be confirmed, the transmittance of the infrared light transmissive region 10a does not have to be 0%, and the transmittance of the infrared light transmissive region 10b does not have to be 100%. In other words, if the infrared light transmittances of these two types of regions are different to the extent that the infrared light transmissive region 10a and the infrared light transmissive region 10b show a contrast difference on the infrared light transmissive image 11. good. The same applies to the infrared light opaque region and the infrared light transmission region of FIGS. 6 to 9.

As described above, according to the anti-counterfeit structure 1 according to the present embodiment, the reflected image confirmed under visible light, the transmitted image confirmed under visible light, and the transmitted image confirmed under non-visible light. The image content is different from that of the image. Utilizing this, it is possible to visually confirm whether or not the paper leaves, that is, the anti-counterfeit structure 1 attached to the paper leaves is genuine, and to identify the authenticity by machine identification. You can also. For example, even when the anti-counterfeit structure 1 includes a hologram, the authenticity identification by machine identification can be accurately performed by using the invisible light transmission image. In addition to the effect of preventing forgery by the hologram, by enabling stable machine identification, it is possible to improve the security of paper sheets as compared with the conventional case.

As described above, the anti-counterfeit structure, paper sheets, authenticity identification device, authenticity identification method, and paper leaf processing apparatus according to the present invention prevent counterfeiting of paper leaves having the anti-counterfeit structure. At the same time, it is useful for accurately machine-identifying the authenticity of paper sheets to which the anti-counterfeit structure is attached.

1 Anti-counterfeiting structure 2 Bills 10, 210 First layer 10a, 210a Infrared light opaque region 10b, 10c, 210b Infrared light transmission region 20, 220 Second layer 100 Bill processing device 110 Input port 120 Transport unit 130 Discharge Outlet 140 Storage unit 150 Control unit 160 Operation display unit 170 (170a, 170b) Authenticity identification device 180 Light source 181 Visible light light source 182 Infrared light light source 191 Reflection sensor 192 Transmission sensor 193 Sensor 200 Control unit

Claims (23)

It is an anti-counterfeiting structure to prevent counterfeiting of paper leaves.
A first layer in which a predetermined design is formed by a plurality of regions having different transmittances of invisible light having a predetermined wavelength.
It is characterized by including a second layer provided above the first layer, capable of transmitting the invisible light transmitted through the first layer, and visually formed with a design different from that of the first layer. Anti-counterfeit structure. The anti-counterfeit structure according to claim 1, wherein the first layer includes a region that transmits the invisible light and a region that does not transmit the invisible light. The first layer has a region that transmits invisible light of the first wavelength and a region that does not transmit the invisible light of the first wavelength but transmits invisible light of a second wavelength different from the first wavelength. The anti-counterfeiting structure according to claim 1 or 2, wherein the structure comprises. The first layer has a region that transmits invisible light of the first wavelength and invisible light of a second wavelength different from the first wavelength, and the second layer that does not transmit the invisible light of the first wavelength. The anti-counterfeiting structure according to claim 1 or 2, which comprises a region that transmits invisible light. The anti-counterfeit structure according to any one of claims 1 to 4, wherein the first layer is formed of a plurality of types of inks having different transmittances of invisible light. The visible light reflection image obtained by irradiating visible light from above the second layer includes the design of the second layer.
The anti-counterfeit structure according to any one of claims 1 to 5, wherein the invisible light transmission image obtained by irradiating the invisible light includes the design of the first layer. The anti-counterfeit structure according to any one of claims 1 to 6, wherein the design formed on the first layer includes at least one of a letter, a number, a symbol, and a pattern. The anti-counterfeit structure according to any one of claims 1 to 7, wherein the first layer does not transmit visible light. The anti-counterfeit structure according to claim 8, wherein the second layer is a layer on which a predetermined design is printed on a material that transmits visible light. The anti-counterfeit structure according to claim 8, wherein the second layer is a hologram. The hologram contains a metal layer that does not transmit the visible light and the invisible light.
The anti-counterfeit structure according to claim 10, wherein the metal layer is processed to transmit the invisible light. The anti-counterfeit structure according to claim 11, wherein the metal layer includes a region that has been processed to transmit invisible light and a region that has not been processed. The anti-counterfeit structure according to any one of claims 1 to 7, wherein the second layer does not transmit visible light. The anti-counterfeit structure according to claim 13, wherein the second layer is a layer in which a predetermined design is printed on an upper surface of a material that does not transmit visible light. The anti-counterfeit structure according to any one of claims 1 to 7, further comprising a filter layer that does not transmit visible light and transmits the invisible light. The first layer is a metal layer forming a hologram, and is a metal layer.
The second layer is a reproduction layer that forms the hologram.
Claims 1 to 7 are characterized in that a predetermined design of the first layer is formed by a region formed by processing the metal layer to transmit invisible light and a region not subjected to the processing. The anti-counterfeiting structure according to any one of the above items. The anti-counterfeit structure according to claim 16, further comprising a filter layer that does not transmit visible light and transmits non-visible light. The anti-counterfeit structure according to any one of claims 1 to 17, wherein the invisible light is infrared light. Paper leaves comprising the anti-counterfeit structure according to any one of claims 1 to 18. The paper leaf according to claim 19, wherein the banknote has the anti-counterfeiting structure. A light source that irradiates invisible light on paper leaves having the anti-counterfeit structure according to any one of claims 1 to 18.
A transmission sensor that acquires invisible light data transmitted through the paper sheets, and a transmission sensor.
A authenticity discrimination device including a discriminator for discriminating the authenticity of the paper leaves by comparing the invisible light transmission data acquired by the transmission sensor with the reference data prepared in advance. The authenticity identification device according to claim 21 is provided.
A paper leaf processing apparatus characterized in that paper leaves are processed based on an identification result by the authenticity identification device. It is a truth identification method that mechanically identifies the truth of paper leaves.
A step of irradiating non-visible light on paper leaves having the anti-counterfeit structure according to any one of claims 1 to 18.
The process of acquiring invisible light data transmitted through the paper leaves and
A authenticity identification method comprising a step of identifying the authenticity of the paper leaves by comparing the acquired invisible light transmission data with a reference data prepared in advance.

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