JP4599586B2 - Anti-counterfeit medium and its discrimination method - Google Patents

Description

The present invention relates to a medium that requires prevention of counterfeiting, such as banknotes and securities, and a method for determining the medium.

  For printed matter such as banknotes and securities that require anti-counterfeiting, print the fluorescent ink in a visible or invisible state, check the fluorescence by a specific method, and determine whether the printed material is authentic or by infrared light. It is known that an ink that absorbs or reflects light is printed, and authenticity is determined by obtaining information different from visual observation when irradiated with infrared light.

As an example, printing identification codes using fluorescent ink excited by ultraviolet light or infrared light is printed, and the identification codes can be read by a machine, but printed papers that cannot be seen with visible light are printed. is there. (For example, refer to Patent Document 1).

In addition, printing using a phosphor (infrared light emitting phosphor) that forms a printing portion that absorbs infrared light on a substrate and emits infrared light when excited by ultraviolet light or infrared light on the printing portion. There is a printed material with overlapping parts (see, for example, Patent Document 2).

In addition, there are a method of printing a plurality of fluorescent inks that fluoresce in different colors with light of different wavelengths on a substrate, and a method of printing a fluorescent ink and an infrared absorbing ink in a plurality of bands (for example, And Patent Document 3).

In addition, a fluorescent ink containing a phosphor whose excitation light wavelength and fluorescence wavelength are both in the infrared light band is provided with an identification code on at least one surface of the substrate, and the wavelength of the excitation light on the substrate surface. And a technology that identifies a card with a concealing layer that absorbs part of visible light and information by fluorescent ink applied to the card through a mask (for example, (See Patent Document 4).

JP 09-160495 A JP 2001-96889 A JP 2002-326443 A Japanese Patent No. 2862215

    However, generally used anti-counterfeit fluorescent prints and the above-mentioned Japanese Patent Application Laid-Open No. 09-160495 merely read the presence / absence or sign of light emission when irradiated with excitation light, and can be obtained by fluorescent light emission. There is only one type of information.

  Japanese Patent Laid-Open No. 2001-96889 described above is a technique for concealing ink that absorbs infrared light with an infrared light emitting phosphor, and information obtained by absorption of infrared light is concealed by infrared absorption. One type of ink. Moreover, even if information is given by an infrared light emitting phosphor that is printed on top of each other, there are two types of information that can be obtained, so that more information than the ink used cannot be given.

Japanese Patent Laid-Open No. 2002-326443 described above gives information by two or more types of fluorescence emission or infrared absorption by printing fluorescent ink or infrared absorption ink having different emission characteristics in a plurality of bands. In order to do so, it is necessary to use the same number or more of ink as the information to be provided. Furthermore, when two or more types of fluorescent inks having different emission characteristics are mixed and printed, fluorescence emission can be confirmed in different wavelength bands, but since all the information is the same, there is only one type of information by fluorescence emission. .

In the above-mentioned Japanese Patent No. 2862215, only one type of information can be given to the card using fluorescent ink.

An object of the present invention is to solve the above-described problems. An ink containing a light-emitting substance that emits visible light and infrared light when irradiated with infrared light, and a substance that absorbs the visible light emission are provided. Two images are formed by combining the inks included, and three types of information are realized with the two pieces of information given by the two types of ink, giving more information to the printed matter without increasing the number of inks. In addition, by detecting a plurality of pieces of information by different means, a medium having a higher anti-counterfeit effect and a method for determining the medium are provided.

The present invention is such that a luminescent image part containing a luminescent substance that emits light in the wavelength band of visible light and infrared light by irradiating infrared light on a substrate, and at least a part of the luminescent image part are laminated. An anti-counterfeit medium having a concealed image portion containing a substance that absorbs visible light and transmits infrared light, wherein the concealed image portion is visible under visible light, and the luminescent image portion is irradiated with infrared light. In this case, the anti-counterfeit medium is characterized in that, except for the concealed image portion, a visible image can be visually recognized, and an infrared image is displayed when a filter that cuts the wavelength of infrared light or less is passed.

The present invention also provides a luminescent image portion including a luminescent material that emits light in a wavelength band of visible light and infrared light upon irradiation of infrared light on a substrate, and the luminescent material and infrared light in the emission wavelength band are An anti-counterfeit medium that includes a concealed image portion that includes a mixture of a substance that absorbs visible light in the emission wavelength band that is different from the transmitted emission wavelength, and the emission image portion is irradiated with infrared light. In this case, the visible image can be visually recognized, and an infrared image can be displayed through a filter that cuts off the wavelength of irradiated infrared light or less, and the concealed image portion can be visually recognized under visible light. An anti-counterfeit medium characterized in that an infrared image is displayed through a filter that cuts light below the wavelength of light.

Further, the present invention is the forgery prevention medium characterized in that the light emitting image portion is colorless, transparent, or the same color or the same color as the substrate.

Further, the present invention provides the medium for preventing forgery, wherein the luminescent material emits light in a visible light wavelength band of 540 nm to 560 nm and an infrared light wavelength band of 1000 nm to 2000 nm by irradiation with infrared light having a wavelength of about 980 nm. It is.

According to the present invention, a light emitting image portion including a light emitting substance that emits light in a wavelength band of visible light and infrared light when irradiated with infrared light, and at least a part of the light emitting image portion are stacked on a substrate. In addition, a medium having a concealed image portion containing a substance that absorbs visible light and transmits infrared light, or the light emitting substance and infrared light in the emission wavelength band are transmitted and are different from the transmitted emission wavelength. A method for determining authenticity of a medium having a concealed image portion including a mixture of a substance that absorbs visible light in the emission wavelength band and the light-emitting image portion, wherein the medium is irradiated with infrared light having a wavelength of about 980 nm Process,
A first display step of displaying a visible image of the emission image portion of the medium under the irradiation infrared light; and the emission image of the medium under the irradiation infrared light with a wavelength of about 980 nm or less cut. A second display step for displaying an infrared image of the image portion and the concealed image portion, a visible image displayed by the first display step, and an infrared image displayed by the second display step; The authenticity determination method is characterized in that the authenticity of the medium is determined by a determination step of comparing the image with a genuine object.

The anti-counterfeit medium of the present invention can give visible information of the concealed image portion, information by the visible light emission in the light emitting image portion and information by the infrared light emission. can do. Further, since it is possible to perform authenticity determination by the naked eye and authenticity determination by machine reading, it has a higher forgery prevention effect.

In addition, since an image that can be observed with visible light and a different observation image that is observed with an infrared monitor can be displayed, it is possible to easily determine authenticity and it is difficult to confirm information under visible light. And has an excellent anti-counterfeiting effect.

Hereinafter, an anti-counterfeit medium and a determination method thereof according to an embodiment of the present invention will be described with reference to the drawings. However, the present invention is not limited to the best mode for carrying out the invention described below, and includes various other embodiments within the scope of the technical idea described in the scope of claims.

FIG. 1 is a plan view in which a light emitting image portion is formed on a substrate. FIG. 2 is a plan view showing an example of an anti-counterfeit medium according to the present invention in which a concealment image portion is formed on the light emitting image portion of FIG. FIG. 3 is a cross-sectional view taken along line AB of the forgery prevention medium shown in FIG. FIG. 4 is a plan view showing how the visible image is seen when the forgery prevention medium of FIG. 2 is irradiated with infrared light. FIG. 5 is a plan view showing how the infrared image is seen when the forgery prevention medium of FIG. 1 is irradiated with infrared light. FIG. 6 is a schematic diagram showing an embodiment of the authenticity determination device for forgery prevention medium of the present invention. FIG. 7 is a plan view showing an example of an anti-counterfeit medium of the present invention in which a light emitting image portion and a concealment image portion are formed on a base material. FIG. 8 is a plan view showing how the visible image is seen when the forgery prevention medium of FIG. 7 is irradiated with infrared light. FIG. 9 is a plan view showing how an infrared image is seen when the forgery prevention medium of FIG. 7 is irradiated with infrared light.

The anti-counterfeit medium 1 of the present invention emits light of at least two different wavelength bands on the substrate 9 by irradiation with infrared light, that is, a visible light wavelength band and an infrared light wavelength band different from the irradiation light. The emission image portion 2 composed of the first region containing the substance and a part of the emission image portion 2 transmit the irradiated infrared light, and transmit at least one wavelength band of the emission wavelength band. A concealed image portion that is concealed by a second region containing a substance that absorbs at least one of the visible light emission wavelength bands that is different from the infrared light emission wavelength band, and is concealed under visible light 10 and the visible image 7 excluding the concealed image portion 10 of the luminescent image portion 2 that can be visually recognized by the irradiated infrared light, and the infrared camera 5 through the sharp cut filter 4 that cuts the central wavelength of the irradiated infrared light or less. The entire light-emitting image part 2 To consist of infrared images 8 is a medium for preventing forgery, wherein.

The anti-counterfeit medium 11 of the present invention includes a light emitting image portion 13 including a substance that emits at least two different visible and infrared wavelength bands upon irradiation with infrared light on a base material 12, and irradiated infrared light. Including at least one substance that absorbs at least one visible light in an emission wavelength band different from the transmitted emission wavelength band and a mixture of the light emitting substance and transmitting the at least one infrared light in the emission wavelength band A sharp cut that forms an image portion 14 and that can be viewed under visible light, a visible image 15 of a light-emitting image portion 13 that can be viewed with irradiation infrared light, and a center wavelength of irradiation infrared light or less. This is a forgery prevention medium comprising an infrared image 16 of the light emitting image portion 13 and an infrared image 16 of the concealed image portion 14 which are visualized by the infrared camera 5 through the filter 4.

In the medium authenticity determination method of the present invention, in the anti-counterfeit medium 1 having the light emitting image portion 2 and the concealed image portion 10, the anti-counterfeit medium 1 is irradiated with infrared light having a wavelength of about 980 nm from the irradiation light source 3. An irradiation step, and a first display step for displaying the visible image 7 in the wavelength band of 540 nm to 560 nm of the emission image portion 2 excluding the portion where the concealment image portion 10 is laminated when the infrared light having a wavelength of about 980 nm is irradiated; Second, an infrared image 8 in a wavelength band of 1000 nm to 2000 nm of the entire light emitting image portion 2 visualized by an infrared camera 5 through a sharp cut filter 4 that cuts a wavelength of 980 nm or less of the irradiated infrared light is displayed. The display process, the visible image 7 displayed in the first display process, and the infrared image 8 displayed in the second display process are displayed, thereby authenticating the image. By a determination step of determining that a authenticity discrimination method for discriminating the authenticity of the medium.

In the medium authenticity determination method of the present invention, in the anti-counterfeit medium 11 having the light emitting image portion 13 and the concealed image portion 14, the anti-counterfeit medium 11 is irradiated with infrared light having a wavelength of about 980 nm from the irradiation light source 3. An irradiation step, a first display step for displaying the visible image 15 in the wavelength band of 540 nm to 560 nm of the light emitting image portion 13 when infrared light having a wavelength of about 980 nm is irradiated, and a wavelength of 980 nm or less of the irradiation infrared light A second display step of displaying the infrared image 16 in the infrared wavelength band of 1000 nm to 2000 nm of the light-emitting image portion 13 and the concealed image portion 14 which are visualized by the infrared camera 5 through the sharp cut filter 4 for cutting And two images of the visible image 15 displayed by the first display step and the infrared image 16 displayed by the second display step are displayed. By a determination step of determining a genuine article, an authenticity discrimination method for discriminating the authenticity of the medium.

Furthermore, the forgery prevention medium authenticity determination device of the present invention will be described. A light source 3 for irradiating the anti-counterfeit media 1 and 11 with infrared light, and light having a wavelength equal to or less than the center wavelength of the infrared light by the irradiation light source 3 is cut. It is composed of a sharp cut filter 4, an infrared camera 5 that captures the emission image portions 2 and 13 and the concealed image portions 10 and 14 via the sharp cut filter 4, and a monitor 6 that displays the image captured by the infrared camera 5. The visible image 7 or the visible image 15 excluding the concealed image portion 10 or 14 that can be observed under visible light, the concealed image portion 10 of the light-emitting image portion 2 that can be observed with infrared irradiation light, and the infrared irradiation light An infrared image 8 of the entire luminescent image portion 2 captured by the infrared camera 5 through the cut filter 4 and displayed on the monitor 6 or an infrared image 16 of the luminescent image portion 13 and the hidden image portion 14 is displayed. Expression An authenticity determination device that performs authenticity discrimination by causing.

FIG. 1 is a plan view in which a light emitting image portion 2 made of, for example, characters “Forest” is formed on a base material 9. FIG. 2 is a plan view showing an embodiment of the anti-counterfeit medium of the present invention in which the shielding image portion 10 is formed on a part of the light-emitting image portion 2 of FIG. It consists of a concealed image portion 10 that is a “tree” character that conceals a part of the light emitting image portion 2 composed of the characters “forest”. In more detail, as shown in the cross-sectional view of FIG. 3, the forgery prevention medium 1 forms a light emitting image portion 2 on a base material 9 and a hidden image portion 10 is laminated on a part of the light emitting image portion 2. is doing.

FIG. 7 is a plan view in which a light emitting image portion 13 made of, for example, characters “Hayashi” and a concealed image portion 14 made of characters “Thu” are formed on the substrate 11.

The base materials 9 and 12 of the anti-counterfeit media 1 and 11 are not particularly limited, and paper, synthetic paper, plastic, wood, glass, resin, or the like can be used.

As the luminescent substance used in the luminescent image portions 2 and 13, an organic or inorganic infrared phosphor can be used.

The light emitting image portions 2 and 13 can be formed by a known printing method such as a screen printing method using ink obtained by mixing the phosphors and pigments, a dispersant, a solvent, an antifoaming agent and the like with the base materials 9 and 12. . In addition, since it is necessary to make the light emission image parts 2 and 13 invisible under visible light, it is preferable that it is colorless or transparent, or the same color as a base material. Moreover, about a pattern etc., it does not specifically limit.

The absorbing material used for the hidden image portions 10 and 14 is a material that absorbs visible light and transmits infrared light. For example, an infrared transmitting pigment that is usually used for a colored ink that transmits infrared light can be used. These infrared transmitting pigments are not required to absorb in the infrared band, and ordinary pigments such as cyan, magenta, and yellow can be used.

The hidden image portions 10 and 14 can be formed by a known printing method such as a screen printing method using an ink obtained by mixing the infrared transmitting pigment and a dispersant, a solvent, an antifoaming agent, or the like. The hidden image portions 10 and 14 are preferably colored because they need to be visible under visible light. Moreover, about a pattern etc., it does not specifically limit.

FIG. 4 is a plan view showing how the visible image 7 is seen when the forgery prevention medium 1 of FIG. 1 is irradiated with infrared light.

  When the anti-counterfeit medium 1 is irradiated with infrared light, as shown in FIG. 4, the portion of the concealed image portion 10 covered with the characters “tree” absorbs visible light by the absorbing substance, and the visible image 7 is concealed. Only the characters “Hayashi” that is not covered by the image portion 10 can be observed.

FIG. 5 is a plan view showing how the infrared image 8 is seen when the forgery prevention medium 1 of FIG. 1 is irradiated with infrared light.

As shown in FIG. 5, when the anti-counterfeit medium 1 is irradiated with infrared light, the portion covered with the characters “tree” of the concealment image portion 10 transmits infrared light, and thus the concealment image portion 10 is exposed to the concealment image portion 10. The character “forest” of the entire infrared image 8 including the covered portion can be observed by a monitor with an infrared camera through a sharp cut filter that cuts a band below the center wavelength of the infrared light.

Note that, under visible light, as shown in FIG. 2, only the characters “tree” that is the hidden image portion 10 of the forgery prevention medium 1 under visible light can be observed.

Therefore, the hidden image portion 10 of the anti-counterfeit medium 1 under visible light as shown in FIG. 2 and the visible image 7 excluding the hidden image portion 10 that can be observed by irradiating infrared light as shown in FIG. 4 are displayed. The authenticity of the medium can be determined by the first display process and the second display process for displaying the infrared image 8 by the irradiation light of the infrared light shown in FIG.

FIG. 8 is a plan view showing how the visible image 15 is seen when the forgery prevention medium 11 of FIG. 7 is irradiated with infrared light.

  When the anti-counterfeit medium 11 is irradiated with infrared light, only the characters “Hayashi” that is the visible image 15 can be observed as shown in FIG.

FIG. 9 is a plan view showing how the infrared image 16 is seen when the forgery prevention medium 11 of FIG. 7 is irradiated with infrared light.

As shown in FIG. 9, when the forgery prevention medium 11 is irradiated with infrared light, the character portion “tree” of the concealed image portion 14 transmits infrared light, so the concealed image portion 14 and the light emitting image portion 13 can be observed by a monitor with an infrared camera through a sharp cut filter that cuts a band below the center wavelength of infrared light.

Note that, under visible light, as shown in FIG. 7, only the characters “tree” that is the hidden image portion 14 of the anti-counterfeit medium 11 under visible light can be observed.

Therefore, as shown in FIG. 7, the first display step of displaying the concealed image portion 14 of the anti-counterfeit medium 11 under visible light and the visible image 15 that can be observed by irradiating infrared light as shown in FIG. The authenticity of the medium can be determined by the second display step of displaying the infrared image 16 by the irradiation light of the infrared light shown in FIG.

FIG. 6 is a schematic diagram showing an embodiment of the anti-counterfeit medium authenticity determination device of the present invention. The anti-counterfeit medium 1 of the present invention is irradiated with infrared light, and the infrared irradiation light is irradiated with infrared light. It comprises a sharp cut filter 4 that cuts light in a wavelength band equal to or less than the center wavelength, an infrared camera 5 that passes through the sharp cut filter 4, and a monitor 6 that displays the image captured by the infrared camera 5.

As shown in FIG. 6, when the forgery prevention medium 1 of the present invention is irradiated with infrared light from the light source 3, the visible image 7 can be visually observed. In addition, the infrared emission image 8 can be observed by the monitor 6 that displays the imaging of the infrared camera 5 through the filter 4 that cuts light having a wavelength shorter than the irradiation light.
〔Example〕

Hereinafter, the forgery prevention medium of the present invention will be described in detail with specific examples.

Example 1
A description will be given of an anti-counterfeit medium using two types of ink as an example. One of the two types of ink is a colorless fluorescent gravure ink that is invisible under visible light, but when irradiated with infrared light with a wavelength of 980 nm, visible light with a wavelength of 550 nm and infrared light with a wavelength of 1000 nm to 2000 nm A material that emits light was blended. The other is a red infrared transmissive gravure ink, which is blended with a material that absorbs visible light having a wavelength of 550 nm or less.

A colorless fluorescent gravure ink was blended as follows.
[Colorless fluorescent gravure ink]
Infrared phosphor (LUMILUXGrnunUC2: Honeywell) 10 parts by weight Rosin modified phenolic resin 40 parts by weight Toluene 50 parts by weight

Infrared transparent red gravure ink was blended as follows.
[Composition of infrared transmitting red gravure ink]
Permanent Red 4R pigment 10 parts by weight Rosin modified phenolic resin 40 parts by weight Toluene 50 parts by weight

The anti-counterfeit medium of Example 1 was obtained by printing a light-emitting image portion on a sheet-like substrate using the colorless fluorescent gravure ink having the above-mentioned composition by a gravure printing method, and then red infrared-transmitting gravure having the above-mentioned composition. The concealed image portion was partially overlapped and printed on the light emitting image portion by a gravure printing method using ink.

  Under visible light, only the concealed image portion was visible, but when infrared light with a wavelength of 980 nm was irradiated, a visible image with a wavelength of 550 nm could be observed only in a portion that did not overlap with the concealed image portion. Similarly, when irradiating infrared light with a wavelength of 980 nm and observing with a monitor with an infrared camera through a sharp cut filter, an infrared image with a wavelength of 1000 nm to 2000 nm in a portion overlapping the concealed image portion could be observed.

As described above, by displaying the concealed image portion under visible light, the visible image with a wavelength of 550 nm excluding the concealed image portion of the light emitting image portion, and the infrared image with a wavelength of 1000 nm to 2000 nm by an infrared light monitor. It was possible to make a true / false discrimination.

The authenticity determination apparatus in the present embodiment includes a light source that irradiates infrared light having a wavelength of 980 nm as a central wavelength, an infrared camera through a sharp cut filter that cuts light having a wavelength of 980 nm or less, and imaging by the infrared camera. It was comprised by the monitor of the infrared light which displays.

When an authenticity determination device is used, a visible image with a wavelength of 550 nm that does not overlap the concealed image portion when irradiated with infrared light with a wavelength of 980 nm, and an infrared image with a wavelength of 1000 nm to 2000 nm by an infrared light monitor Was able to be observed. Of course, when the infrared light was turned off, only the hidden image portion could be observed.

(Example 2)
Next, an anti-counterfeit medium using a red phosphor and magenta toner will be described as an example. The anti-counterfeit medium of Example 2 was formed by laminating a transparent film containing an infrared phosphor (LUMILUXGrnunUC2: manufactured by Honeywell) on a base material to form a light-emitting image portion. The concealed image portion laminated with a transparent film including a product was partially overlapped on a part of the light emitting image portion.

  In the anti-counterfeit medium of Example 2, only the concealed image portion could be observed under visible light, but when irradiating infrared light with a wavelength of 980 nm, only a portion that does not overlap with the concealed image portion is observed with a visible image with a wavelength of 550 nm. I was able to. Similarly, in the observation with an infrared light monitor irradiated with infrared light having a wavelength of 980 nm, an infrared image having a wavelength of 1000 nm to 2000 nm in a portion overlapping the concealed image portion could be observed.

(Example 3)
Next, an anti-counterfeit medium using two types of ink will be described as an example. One of the two types of ink is a colorless fluorescent gravure ink that is invisible under visible light, but when irradiated with infrared light with a wavelength of 980 nm, visible light with a wavelength of 550 nm and infrared light with a wavelength of 1000 nm to 2000 nm A material that emits light was blended. The other was an ink in which a red infrared transmissive gravure ink and a colorless fluorescent gravure ink were mixed.

A colorless fluorescent gravure ink was blended as follows.
[Colorless fluorescent gravure ink]
Infrared phosphor (LUMILUXGrnunUC2: Honeywell) 10 parts by weight Rosin modified phenolic resin 40 parts by weight Toluene 50 parts by weight

Infrared transmitting red gravure ink and colorless fluorescent gravure ink were blended as follows.
[Composition of infrared transmitting red gravure ink and colorless fluorescent gravure ink]
Permanent Red 4R pigment 5 parts by weight Infrared phosphor (LUMILUXGrnunUC2: manufactured by Honeywell) 5 parts by weight Rosin modified phenolic resin 40 parts by weight Toluene 50 parts by weight

The anti-counterfeit medium of Example 3 was obtained by printing a light-emitting image portion on a sheet-like substrate using the colorless fluorescent gravure ink having the above-mentioned composition by a gravure printing method, and then red infrared-transmitting gravure having the above-mentioned composition. It printed on the base material by the gravure printing method using the ink and colorless fluorescent gravure ink.

  Under visible light, only the concealed image portion was visible, but when irradiating infrared light with a wavelength of 980 nm, a visible image with a wavelength of 550 nm could be observed. Similarly, when infrared light with a wavelength of 980 nm was irradiated and observed with a monitor using an infrared camera via a sharp cut filter, an infrared image with a wavelength of 1000 nm to 2000 nm could be observed.

As described above, it was possible to determine authenticity by displaying a visible image having a wavelength of 550 nm in the light emitting image portion and an infrared image having a wavelength of 1000 nm to 2000 nm obtained by monitoring infrared light.

It is the top view which formed the light emission image part on the base material. It is a top view of the forgery prevention medium which formed the shielding image part in a part on the light emission image part of FIG. FIG. 3 is a cross-sectional view taken along line AB of the forgery prevention medium illustrated in FIG. 2. FIG. 3 is an observation view of a visible image of the forgery prevention medium shown in FIG. 2. It is an observation figure of the infrared image of the forgery prevention medium shown in FIG. It is the schematic of the authenticity determination apparatus of the forgery prevention medium of this invention. It is a top view of the forgery prevention medium which formed the light emission image part and the shielding image part on the base material. It is an observation figure of the visible image of the forgery prevention medium shown in FIG. It is an observation figure of the infrared image of the forgery prevention medium shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 Anti-counterfeit medium 2,13 Light emission image part 3 Light source which irradiates infrared light 4 Sharp cut filter which cuts light below the center wavelength of irradiation infrared light 5 Infrared camera 6 Monitor 7, 15 Visible image 8, 16 Infrared image 9, 12 Base material 10, 14 Hidden image part

Claims (5)

A light-emitting image portion including a light-emitting substance that emits light in a wavelength band of visible light and infrared light upon irradiation with infrared light on a substrate;
In the anti-counterfeit medium having a concealed image portion containing a substance that absorbs visible light and transmits infrared light so that at least a part of the light-emitting image portion is laminated,
The concealed image portion can be visually recognized under visible light, and when the luminescent image portion is irradiated with infrared light, a filter other than the concealed image portion can be visually recognized as a visible image and cuts below the wavelength of infrared light. An anti-counterfeit medium, characterized in that an infrared image is displayed when it is passed through. A light-emitting image portion including a light-emitting substance that emits light in a wavelength band of visible light and infrared light upon irradiation with infrared light on a substrate;
An anti-counterfeit medium having a concealment image portion including a mixture of the light-emitting substance and infrared light in the emission wavelength band and a mixture of a substance that absorbs visible light in the emission wavelength band different from the transmitted emission wavelength. The light-emitting image portion is visible as a visible image when irradiated with infrared light, and displays an infrared image when passing through a filter that cuts off the wavelength of irradiated infrared light, and the concealed image portion. Is an anti-counterfeit medium characterized by being visible under visible light and displaying an infrared image through a filter that cuts off the wavelength of irradiated infrared light or less. The anti-counterfeit medium according to claim 1 or 2, wherein the light-emitting image portion is colorless, transparent, or has the same color or the same color as the substrate. The luminescent material emits light in a visible light wavelength band of 540 nm to 560 nm and an infrared light wavelength band of 1000 nm to 2000 nm when irradiated with infrared light having a wavelength of around 980 nm. The anti-counterfeit medium described in Crab. A light-emitting image portion including a light-emitting substance that emits light in a wavelength band of visible light and infrared light upon irradiation with infrared light on a substrate;
To laminating at least a portion of the light emitting image part, absorb visible light, wherein the light emitting image part emits light, medium and an concealed image portion containing a substance infrared light is transmitted, or a light emitting substance Authenticity of a medium having a concealed image portion including a mixture of a substance that transmits infrared light in the emission wavelength band and absorbs visible light in the emission wavelength band different from the transmitted emission wavelength, and the emission image portion A discrimination method,
Irradiating the medium with infrared light having an excitation wavelength of the luminescent material ;
A first display step of displaying a visible image of the light-emitting image portion under the irradiated infrared light of the medium;
A second display step for displaying an infrared image of the light-emitting image portion and a concealed image portion obtained by cutting below the excitation wavelength of the light-emitting substance under the irradiation infrared light of the medium;
Two images, a visible image displayed by the first display step and an infrared image displayed by the second display step;
An authenticity determination method, wherein the authenticity of a medium is determined by a determination step of comparing an image of a genuine object.

Images