JP6781953B2 - Light emitting medium and reading method of light emitting medium - Google Patents

Description

The present invention relates to a light emitting medium that emits two infrared rays in different wavelength regions or emits two ultraviolet rays in different wavelength regions when irradiated with infrared rays, ultraviolet rays, or visible light, and a method for reading the same.

In media such as securities including cash vouchers and prepaid cards, and identification cards including driver's licenses, which require anti-counterfeiting, the base material and the light emission provided on the base material are used to enhance security. A light emitting medium equipped with a body has been developed. In such a light emitting medium, by irradiating the light emitting body with invisible light, visible light is emitted from the light emitting body, and by reading visible light of a different color emitted from the light emitting body, the medium is a general-purpose color printer or the like. It can be prevented from being easily forged.

Further, in recent years, in order to further enhance the anti-counterfeiting effect, there is a demand for the development of a light emitting medium that makes it more difficult to analyze the light emitted from the light emitting body.

Japanese Patent No. 554158

The present invention has been made in consideration of such a point, and an object of the present invention is to provide a light emitting medium in which analysis of light emitted from a light emitting body becomes more difficult and a method for reading the light emitting medium.

The present invention includes a base material and a light emitting body provided on the base material, and the light emitting body emits first infrared rays having a first wavelength region when irradiated with visible light, infrared rays, or ultraviolet rays. A first wavelength region of the first infrared ray of the first illuminant and a second infrared ray of the second illuminant, including a first illuminant and a second illuminant that emits a second infrared ray having a second wavelength region. The light emitting medium is characterized in that the second wavelength regions overlap each other and the first wavelength region of the first infrared rays of the first light emitter is narrower than the second wavelength region of the second infrared rays of the second light emitter.

The present invention is a light emitting medium characterized in that the peak wavelength in the first wavelength region of the first infrared ray matches or approximates the peak wavelength in the second wavelength region of the second infrared ray.

The present invention comprises a base material and a light emitting body provided on the base material, and the light emitting body emits a first ultraviolet ray having a first wavelength region when irradiated with visible light or ultraviolet rays. It includes a light emitting body and a second light emitting body that emits a second ultraviolet light having a second wavelength region, the first wavelength region of the first ultraviolet light of the first light emitting body and the second ultraviolet light of the second light emitting body. It is a light emitting medium characterized in that the wavelength regions overlap each other and the first wavelength region of the first ultraviolet rays of the first light emitter is narrower than the second wavelength region of the second ultraviolet rays of the second light emitter.

The present invention is a light emitting medium characterized in that the peak wavelength in the first wavelength region of the first ultraviolet ray matches or approximates the peak wavelength in the second wavelength region of the second ultraviolet ray.

In the present invention, the first illuminant contains a first pattern or character, the second illuminant contains a second pattern or character, and the first illuminant and the second illuminant overlap each other. It is a light emitting medium characterized by.

In the present invention, the first illuminant contains a first pattern or character, the second illuminant contains a second pattern or character, and the first illuminant and the second illuminant are separated from each other. It is a light emitting medium characterized by being

The present invention is a light emitting medium characterized in that the first light emitting body and the second light emitting body are mixed with each other.

The present invention includes a base material and a light emitting body provided on the base material, and the light emitting body emits first infrared rays having a first wavelength region when irradiated with visible light, infrared rays, or ultraviolet rays. A first light emitting body and a second light emitting body that emits a second infrared ray having a second wavelength region are included, and the first wavelength region of the first infrared ray of the first light emitting body and the second infrared ray of the second light emitting body are The step of preparing a light emitting medium in which the second wavelength region overlaps with each other and the first wavelength region of the first infrared ray of the first light emitting body is narrower than the second wavelength region of the second infrared ray of the second light emitting body, and the light emitting medium Visible light, infrared rays, or ultraviolet rays are irradiated from the irradiation unit to emit the first infrared rays having the first wavelength region from the first light emitter, and emit the second infrared rays having the second wavelength region from the second light emitters. The step of reading the first infrared ray and the second infrared ray by the first infrared ray detection unit that reads the wavelength region where the first wavelength region of the first infrared ray and the second infrared ray region of the second infrared ray overlap. A method for reading a light emitting medium, which comprises a step of reading the second infrared ray by a second infrared ray detection unit that reads only the wavelength region of the second infrared ray.

The present invention comprises a base material and a light emitting body provided on the base material, and the light emitting body emits a first ultraviolet ray having a first wavelength region when irradiated with visible light or an ultraviolet ray. A light emitting body and a second light emitting body that emits a second ultraviolet ray having a second wavelength region are included, and a first wavelength region of the first ultraviolet light of the first light emitting body and a second light emitting body of the second ultraviolet light of the second light emitting body are included. A step of preparing a light emitting medium in which the wavelength regions overlap each other and the first wavelength region of the first ultraviolet rays of the first light emitting body is narrower than the second wavelength region of the second ultraviolet rays of the second light emitting body, and visible light in the light emitting medium. Alternatively, a step of irradiating ultraviolet rays to emit the first ultraviolet rays having a first wavelength region from the first illuminant, and emitting the second ultraviolet rays having a second wavelength region from the second illuminant, and the first. Only the step of reading the first ultraviolet ray and the second ultraviolet ray by the first ultraviolet ray detecting unit which reads the wavelength region where the first wavelength region of the ultraviolet ray and the second wavelength region of the second ultraviolet ray are different, and the wavelength region of the second ultraviolet ray. This is a method for reading a light emitting medium, which comprises a step of reading the second ultraviolet ray by a second ultraviolet ray detecting unit for reading the wavelength.

As described above, according to the present invention, it is possible to provide a light emitting medium in which it is difficult to analyze the light emitted from the light emitting body, and a method for reading the light emitting medium.

FIG. 1 is a plan view showing an example of a light emitting medium of the present invention. FIG. 2 is a side view showing a method of reading a light emitting medium in the first embodiment of the present invention. FIG. 3 is a side view showing a method of reading a light emitting medium. 4 (a) and 4 (b) are diagrams showing the emission spectrum of the illuminant according to the first embodiment of the present invention. FIG. 5 is a side view showing a light emitting medium showing a modification of the first embodiment of the present invention. FIG. 6 is a plan view showing a light emitting medium according to a modified example of the present invention. 7 (a) and 7 (b) are plan views showing a method of reading a light emitting medium in a modified example of the present invention. FIG. 8 is a plan view showing a light emitting medium according to a second embodiment of the present invention. FIG. 9 is a side view showing a light emitting medium according to a second embodiment of the present invention.

<First Embodiment>
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 4. First, the entire anti-counterfeit medium 10 made of the light emitting medium of the present invention will be described.

<Anti-counterfeit medium>
FIG. 1 is a diagram showing an example of an anti-counterfeit medium 10, for example, a gift certificate (securities) according to the present embodiment. As shown in FIG. 1, the anti-counterfeit medium 10 includes a base material 11 and a light emitting body 12 formed on the base material 11. In the present embodiment, as will be described later, the light emitting body 12 functions as an image for authenticity determination for determining the authenticity of the anti-counterfeit medium 10. As shown in FIG. 1, the illuminant 12 has a first illuminant 12A that emits a first infrared ray a having a first wavelength region W1 and a second wavelength region when irradiated with visible light, infrared rays, or ultraviolet rays. It includes a second light emitter 12B that emits a second infrared ray b having W2.

In this case, as shown in FIG. 4, the wavelength region W1 of the first infrared ray a that emits light from the first light emitting body 12A and the wavelength region W2 of the second infrared ray b that emits light from the second light emitting body 12B overlap each other. Further, the wavelength region W1 of the first infrared ray a is narrower than the wavelength region W2 of the second infrared ray b. Further, the peak wavelength of the wavelength region W1 of the first infrared ray a matches or approximates the peak wavelength of the wavelength region W2 of the second infrared ray b.

The material of the base material 11 used in the anti-counterfeit medium 10 is not particularly limited, and is appropriately selected according to the type of securities to be the anti-counterfeit medium 10. For example, as the material of the base material 11, white polyethylene terephthalate having excellent printability and processability is used. The thickness of the base material 11 is appropriately set according to the type of securities composed of the anti-counterfeit medium 10.

The size of the light emitting body 12 is not particularly limited, and is appropriately set according to the ease of authenticity discrimination, the required discrimination accuracy, and the like. For example, the height and width of the region covered by the illuminant 12 are within the ranges of 1 to 210 mm and 1 to 300 mm, respectively.

<Light emitter>
Next, the illuminant 12 will be described in more detail with reference to FIGS. 1 to 3. FIG. 1 is a plan view showing a light emitting medium 10, and FIGS. 2 and 3 are side views showing a reading method of the light emitting medium 10.

The illuminant 12 provided on the base material 11 includes a first illuminant 12A that emits a first infrared ray a having a first wavelength region W1 when irradiated with visible light, infrared rays, or ultraviolet rays as described above. It includes a second illuminant 12B that emits a second infrared ray b having a second wavelength region W2.

Such a first light emitter 12A contains a colorless ink for a first light emitter that emits the first infrared ray a when irradiated with visible light, infrared rays, or ultraviolet rays, but does not emit visible light. Further, in such an ink for the first light emitting body, the position of the first light emitting body 12A can be easily confirmed to specify the infrared detection region, and the first light emitting body 12A can be easily manufactured. For the above convenience, a desired amount of pigment may be mixed. Since this pigment emits fluorescence, it can be visually confirmed.

Similarly, the second illuminant 12B contains a colorless second illuminant ink that emits the second infrared b but does not emit visible light when irradiated with visible light, infrared rays, or ultraviolet rays. Further, in such an ink for a second illuminant, the position of the second illuminant 2B can be easily confirmed to specify an infrared detection region, and the second illuminant 12B can be easily produced. For the above convenience, a desired amount of pigment may be mixed. Since this pigment emits fluorescence, it can be visually confirmed.

As described above, the first illuminant 12A is produced by the first illuminant ink containing the pigment, and the second illuminant 12B is produced by the second illuminant ink containing the pigment, whereby the first illuminant 12A and the first illuminant are produced. When the 2 light emitters 12B are irradiated with visible light, infrared rays, or ultraviolet rays, the first infrared rays a having the first wavelength region W1 can be emitted from the first light emitters 12A, and the second light emitters 12B to the second wavelength region can be emitted. The second infrared ray b having W2 can be emitted.

In this case, the first wavelength region W1 of the first infrared ray a overlaps with the second wavelength region W2 of the second infrared ray b, but the first wavelength region W1 of the first infrared ray a is the second wavelength region of the second infrared ray b. It is narrower than W2.

Further, the peak wavelength of the first wavelength region W1 of the first infrared ray a matches or approximates the peak wavelength of the second wavelength region W2 of the second infrared ray b.

Here, the first wavelength region W1 of the first infrared ray a has a width of about 20 nm centered on, for example, 900 nm (see FIG. 4A). Further, the second wavelength region W2 of the second infrared ray b has a width of about 100 to 200 nm centered on, for example, 900 nm.

Further, in the present embodiment, "the peak wavelengths of the first wavelength region W1 and the second wavelength region W2 match or approximate" does not have to completely match, and a certain width, for example, a narrow width between both peak wavelengths is required. It may have a width equal to or less than the width (20 nm) of the first wavelength region W1 of the first infrared ray a in the range.

Here, if the width between the peak wavelengths of the first wavelength region W1 and the second wavelength region W2 becomes larger than the width of the first wavelength region W1, the operation of reading the fluorescent medium described later cannot be performed accurately. On the other hand, it is difficult in manufacturing to completely match the widths between the peak wavelengths of the first wavelength region W1 and the second wavelength region W2.

Therefore, the peak wavelengths of the first wavelength region W1 and the second wavelength region W2 have a constant width as described above.

The first illuminant 12A and the second illuminant 12B of the illuminant 12 having the above-mentioned structure are formed on the base material 11 separately from each other (see FIG. 1). In this case, the design of the first light emitting body 12A and the design of the second light emitting body 12B are separated and do not overlap, but may be closely aligned without any gap (tweezers structure).

In this way, when manufacturing a tweezers structure in which the design of the first light emitting body 12A and the design of the second light emitting body 12B are separated and are not overlapped but are closely fitted without gaps, some of the ends are partially aligned. It may overlap. When manufacturing a hair-pulling structure, if printing can be performed with high accuracy, it is possible to produce a printed matter having a beautiful appearance.

In FIG. 1, the first illuminant 12A includes twelve round shapes arranged in an annular shape, and the second illuminant 12B includes four provided inside the round shape of the twelve first issuers 12A. Includes the round shape of. Of these, the 12 round shapes of the first light emitting body 12A constitute the first pattern or character, and the four round shapes of the second light emitting body 12B constitute the second pattern or character.

Next, the operation of the present embodiment having such a configuration, that is, the method of reading the light emitting medium will be described with reference to FIGS. 2 and 3.

First, a light emitting medium 10 having a base material 11 and a light emitting body 12 including a first light emitting body 12A and a second light emitting body 12B provided on the base material 11 is prepared.

Next, the light emitting medium 10 is irradiated with visible light, infrared rays, or ultraviolet rays from the irradiation unit 20. At this time, the first infrared ray a having the first wavelength region W1 is emitted from the first light emitting body 12A. At the same time, the second infrared ray b having the second wavelength region W2 emits light from the second light emitter 12B.

Next, the infrared detection unit 21 provided integrally with the irradiation unit 20 detects the first infrared ray a emitted from the first light emitting body 12A and the second infrared ray b emitted from the second light emitting body 21B.

In this case, first, the infrared detection unit 21 is set to the first infrared detection unit mode for reading the wavelength region where the first wavelength region W1 of the first infrared ray a and the second wavelength region W2 of the second infrared ray b overlap (see FIG. 2). .. In this case, the detection wavelength W0 of the infrared detection unit 21 has a center wavelength λ1 (see FIG. 4A), and the infrared detection unit 21 emits light from the first light emitter 12A, the first infrared ray a and the second light emitter. Both of the second infrared rays b emitted from the 12B can be read, and the image read by the infrared ray detecting unit 21 is displayed on the monitor 23.

At this time, the monitor 23 has a first pattern or character of the first light emitting body 12A composed of 12 circular shapes arranged in a ring shape, and four round shapes arranged inside the first light emitting body 12A. A second pattern or character of the second illuminant 12B made of the above is displayed.

Next, the infrared detection unit 21 is set to the second infrared detection unit mode that reads only the second wavelength region W2 of the second infrared b (see FIG. 3). In this case, the detection wavelength W0 of the infrared detection unit 21 has a center wavelength λ2 (see FIG. 4A), and the infrared detection unit 21 can read only the second infrared ray b emitted from the second light emitter 12B. The image read by the infrared detection unit 21 is displayed on the monitor 23.

By the way, in FIG. 4A, when the emission intensities of the first light emitting body 12A and the second light emitting body 12B are combined, that is, whether the light emitting intensity of the pigment itself is set to be the same and printing is performed at the same printing density. Or, when the emission intensities of the pigments themselves are different, the emission intensities of the first illuminant 12A and the second illuminant 12B are combined by adjusting the density at the time of printing to match the emission intensities. The 2 illuminant 12B is more preferable in terms of anti-counterfeiting because the density on the image is observed in the same manner.

At this time, only the second pattern or character composed of the four round shapes of the second light emitter 12B is displayed on the monitor 23.

As described above, according to the present embodiment, the light emitting medium 10 is irradiated with visible light, infrared rays, or ultraviolet rays from the irradiation unit 20, and the detection unit mode of the infrared detection unit 21 has a detection wavelength W0 having a center wavelength λ1. By simply switching between the first infrared detection unit mode and the second infrared detection unit mode in which the detection wavelength W0 has the center wavelength λ2, the second light emitting body is read from both the first light emitting body 12A and the second light emitting body 12B. It is possible to easily switch to the state of reading only 12B. Then, when the detection unit mode of the infrared detection unit 21 is switched as described above, only when the state of reading both the first light emitting body 12A and the second light emitting body 12B is switched to the state of reading only the second light emitting body 12B. , The light emitting medium 10 can be determined to be genuine.

In FIG. 4A, the wavelength region W1 of the first infrared ray a emitted from the first light emitting body 12A and the wavelength region W2 of the second infrared ray b emitted from the second light emitting body 12B overlap each other, and An example is shown in which the peak wavelength of the first emission line a and the peak wavelength of the second infrared ray b match or are similar to each other. However, as shown in FIG. 4B, the wavelength region W1 of the first infrared ray a and the second infrared ray b Although the wavelength regions W2 of the above overlap with each other, the peak wavelength of the first infrared ray a and the peak wavelength of the second infrared ray b may differ from each other by, for example, about 50 nm. In FIG. 4B, the light emitting medium 10 is irradiated with visible light, infrared rays, or ultraviolet rays from the irradiation unit 20, and the detection unit mode of the infrared detection unit 21 is set to the first infrared detection unit in which the detection wavelength W0 has the center wavelength λ1. When the mode is switched, both the first light emitting body 12A and the second light emitting body 12B can be read, and when the detection wavelength W0 is switched to the second infrared detection unit mode having the center wavelength λ2, the second light emitting body 12B Can only read.

Further, in FIGS. 4A and 4B, conversely, the detection unit mode of the infrared detection unit 21 is switched, and both the first light emitting body 12A and the second light emitting body 12B are read from the state where only the second light emitting body 12B is read. When the state is switched to the reading state, the light emitting medium 10 can be determined to be genuine.

Furthermore, in FIG. 4A, the wavelength region W1 of the first infrared ray a emitted from the first illuminant 12A of the illuminant 12 and the second infrared ray b emitted from the second illuminant 12B of the illuminant 12. The wavelength regions W2 of the above are overlapped with each other, and the peak wavelength of the first infrared ray a and the peak wavelength of the second infrared ray b coincide with or approximate each other. Therefore, compared to the case where the light emitting body 12 emits two types of light whose wavelength regions are significantly different from each other, the light emitting body 12 emits two types of light, the first infrared ray a and the second infrared ray b. It is difficult for a third party to analyze and find out what is happening. Therefore, it is more difficult to forge the light emitting medium 10.

Next, a modified example of the present embodiment will be described. In the above embodiment, an example is shown in which the light emitting body 12 provided on the base material 11 has a first light emitting body 12A and a second light emitting body 12B separated from each other on the base material 11. The first illuminant 12A may be formed on the base material 11 first, and the second illuminant 12B having a shape smaller than that of the first illuminant 12A may be formed on the first illuminant 12A (FIG. 5). reference).

In FIG. 5, when the infrared detection unit 21 is set to the first infrared detection unit mode, it is located around the second pattern or character of the second light emitting body 12B and the second pattern or character of the second light emitting body 12B. The first pattern or character of the first light emitter 12A is displayed. When the infrared detection unit 21 is set to the second infrared detection unit mode, only the second pattern or characters of the second light emitting body 12B are displayed.

Furthermore, it has a first light emitter 12A having 12 round shapes in which the light emitting bodies 12 on the base material 11 are arranged in an annular shape, and four round shapes arranged inside the 12 round shapes. An example having the second light emitting body 12B is shown, but the light emitting body 12 is not limited to this, and the light emitting body 12 has a first picture or character, for example, a first light emitting body 12A having "A" and "C", and a second picture or a second picture. It may have a second illuminant 12B having a letter, eg, a "B" located between the "A" and "C" (see FIGS. 6 and 7 (a) and 7 (b)).

In this case, when the infrared detection unit 21 is set to the first infrared display unit mode, the first pattern or character of the first light emitter 12A, "A" and "C", and the second pattern or the second pattern of the second light emitter 12B or Both the letter "B" and "B" are displayed on the monitor 23 (see FIG. 7A). On the other hand, when the infrared detection unit 21 is set to the second infrared display unit mode, only the second pattern or character "B" of the second light emitter 12B is displayed on the monitor 23 (see FIG. 7B). In this case, the pattern may be fine micro characters.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS. 8 and 9.
In the second embodiment shown in FIGS. 8 and 9, the illuminant 12 on the base material 11 has the first illuminant 12A and the second illuminant 12B, and the first illuminant 12A and the second illuminant 12A. The other configurations are substantially the same as those of the first embodiment shown in FIGS. 1 to 4, except that the 12Bs are mixed with each other.

In FIGS. 8 and 9, when the light emitting body 12 is irradiated with visible light, infrared rays, or ultraviolet rays, the first light emitting body 12A emits the first infrared rays a having the first wavelength region W1, and the second light emitting bodies B emit the first infrared rays a. The second infrared ray b having the two wavelength region W2 is emitted.

The illuminant 12 having such a configuration includes the ink for the first illuminant and the ink for the second illuminant, and the position of the illuminant 12 can be further confirmed, and the illuminant 12 is mixed for convenience of manufacturing. It contains pigments, and these first light emitter inks, second light emitter inks, and pigments are mixed in the light emitter 12. Since this pigment emits fluorescence, it can be visually confirmed.

In the light emitting medium 10 having such a configuration, the first infrared ray a and the second light emitting body emitted from the first light emitting body 12A of the light emitting body 12 by the first infrared ray detecting unit mode in which the detection wavelength W0 has the center wavelength λ1. Both of the second infrared rays b emitted from 12B can be detected (see FIG. 4A).

Further, only the second infrared ray b emitted from the second light emitting body 12B of the light emitting body 12 can be detected by the second infrared ray detecting unit mode in which the detection wavelength W0 has the center wavelength λ2.

For example, the light emitting medium 10 is read by using both the first infrared detection unit mode in which the detection wavelength W0 has the center wavelength λ1 and the second infrared detection unit mode in which the detection wavelength W0 has the center wavelength λ2. It can be easily confirmed that the body 12 includes the first light emitting body 12A and the second light emitting body 12B mixed with each other.

<Other embodiments>
In each of the above embodiments, by irradiating the light emitting body 12 of the light emitting medium 10 with visible light, infrared rays, or ultraviolet rays, the first infrared rays a having a first wavelength region W1 from the first light emitting body 12A of the light emitting body 12 a. The second light emitting body 12B emits the second infrared ray b having the second wavelength region W2, but the light emitting body 12 is not limited to this, and the light emitting body 12 irradiates the light emitting body 12 with visible light or ultraviolet rays. By doing so, it may have a first illuminant 12A that emits a first ultraviolet ray having a first wavelength region and a second illuminant 12B that emits a second ultraviolet ray having a second wavelength region. In this case, the first wavelength region from the first illuminant 12A and the second wavelength region of the second ultraviolet ray from the second illuminant 12B overlap each other. Further, the first wavelength region of the first ultraviolet ray is narrower than the second wavelength region of the second ultraviolet ray, and the peak wavelength of the first wavelength region of the first ultraviolet ray is the peak wavelength of the second wavelength region of the second ultraviolet ray. Matches or is close to.

10 Anti-counterfeit medium 11 Base material 12 Light emitter 12A First light emitter 12B Second light emitter 20 Irradiation unit 21 Infrared detection unit 23 Monitor a First infrared ray b Second infrared ray λ1 Detection wavelength λ2 Detection wavelength

Claims (9)

With the base material
With a light emitter provided on this base material,
The illuminant includes a first illuminant that emits a first infrared ray having a first wavelength region and a second illuminant that emits a second infrared ray having a second wavelength region when irradiated with visible light, infrared rays, or ultraviolet rays. Including,
The first wavelength region of the first infrared ray of the first illuminant and the second wavelength region of the second infrared ray of the second illuminant overlap each other, and the first wavelength region of the first infrared ray of the first illuminant is the first. narrower than the second wavelength region of the second infrared 2 light emitters rather,
A light emitting medium characterized in that the width between the peak wavelength of the first wavelength region of the first infrared ray and the peak wavelength of the second wavelength region of the second infrared ray is smaller than the width of the first wavelength region . The light emitting medium according to claim 1, wherein the peak wavelength in the first wavelength region of the first infrared ray matches or approximates the peak wavelength in the second wavelength region of the second infrared ray. With the base material
With a light emitter provided on this base material,
The illuminant includes a first illuminant that emits a first ultraviolet ray having a first wavelength region and a second illuminant that emits a second ultraviolet ray having a second wavelength region when irradiated with visible light or ultraviolet rays.
The first wavelength region of the first ultraviolet ray of the first illuminant and the second wavelength region of the second ultraviolet ray of the second illuminant overlap each other, and the first wavelength region of the first ultraviolet ray of the first illuminant is the first. narrower than the second wavelength region of the second ultraviolet 2 emitters rather,
A light emitting medium characterized in that the width between the peak wavelength of the first wavelength region of the first ultraviolet light and the peak wavelength of the second wavelength region of the second ultraviolet light is smaller than the width of the first wavelength region . The light emitting medium according to claim 3, wherein the peak wavelength in the first wavelength region of the first ultraviolet ray matches or approximates the peak wavelength in the second wavelength region of the second ultraviolet ray. The first illuminant contains a first pattern or character and contains.
The second illuminant contains a second pattern or character and contains.
The light emitting medium according to any one of claims 1 to 4, wherein the first light emitting body and the second light emitting body overlap each other. The first illuminant contains a first pattern or character and contains.
The second illuminant contains a second pattern or character and contains.
The light emitting medium according to any one of claims 1 to 4, wherein the first light emitting body and the second light emitting body are separated from each other. The light emitting medium according to any one of claims 1 to 4, wherein the first light emitting body and the second light emitting body are mixed with each other. A first light emitter comprising a base material and a light emitting body provided on the base material, and the light emitting body emits a first infrared ray having a first wavelength region when irradiated with visible light, infrared rays, or ultraviolet rays. And a second illuminant that emits a second infrared ray having a second wavelength region, the first wavelength region of the first infrared ray of the first illuminant and the second wavelength region of the second infrared ray of the second illuminant. Are overlapping with each other, and the first wavelength region of the first infrared ray of the first illuminant is narrower than the second wavelength region of the second infrared ray of the second illuminant.
The light emitting medium is irradiated with visible light, infrared rays, or ultraviolet rays from an irradiation unit to emit first infrared rays having a first wavelength region from the first light emitting body, and the second light emitting body has a second wavelength region. 2 The process of emitting infrared rays and
A step of reading the first infrared ray and the second infrared ray by a first infrared ray detection unit that reads a wavelength region in which the first wavelength region of the first infrared ray and the second wavelength region of the second infrared ray overlap, and the second infrared ray. A step of reading the second infrared ray by a second infrared ray detection unit that reads only the wavelength region is provided.
A reading of a light emitting medium, characterized in that the width between the peak wavelength of the first wavelength region of the first infrared ray and the peak wavelength of the second wavelength region of the second infrared ray is smaller than the width of the first wavelength region. Method. A first illuminant and a first illuminant having a base material and a illuminant provided on the base material, and the illuminant emits a first ultraviolet ray having a first wavelength region when irradiated with visible light or ultraviolet rays. The first wavelength region of the first ultraviolet ray of the first illuminant and the second wavelength region of the second ultraviolet ray of the second illuminant include a second illuminant that emits a second ultraviolet ray having a two wavelength region. A step of preparing a light emitting medium that overlaps and the first wavelength region of the first ultraviolet ray of the first illuminant is narrower than the second wavelength region of the second ultraviolet ray of the second illuminant.
The light emitting medium is irradiated with visible light or ultraviolet rays to emit the first ultraviolet rays having a first wavelength region from the first light emitting body, and to emit the second ultraviolet rays having a second wavelength region from the second light emitting body. Process and
A step of reading the first ultraviolet ray and the second ultraviolet ray by a first ultraviolet ray detecting unit that reads a wavelength region in which the first wavelength region of the first ultraviolet ray and the second wavelength region of the second ultraviolet ray are different, and the second ultraviolet ray. It is provided with a step of reading the second ultraviolet ray by a second ultraviolet ray detecting unit that reads only the wavelength region.
A reading of a light emitting medium, characterized in that the width between the peak wavelength of the first wavelength region of the first ultraviolet ray and the peak wavelength of the second wavelength region of the second ultraviolet ray is smaller than the width of the first wavelength region. Method.

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