JP5618199B2 - Authenticity determination system and authenticity determination method of luminescent medium - Google Patents

Description

  The present invention relates to a true / false determination system and a true / false determination method for performing true / false determination on a light emitting medium.

  In recent years, micro characters, copy check patterns, infrared absorbing inks have been used to enhance security in media that require prevention of counterfeiting, such as securities including gold vouchers and prepaid cards, and identification cards including licenses. Alternatively, fluorescent ink is used. Among them, the fluorescent ink is an ink containing a phosphor that is hardly visible under visible light but is visible when invisible light (ultraviolet rays or infrared rays) is irradiated. By using such a fluorescent ink, it is possible to form a light emitting portion that appears only when invisible light within a specific wavelength region is irradiated on securities or the like. By using such a light emitting unit, it is possible to determine whether securities or the like is legitimate.

  For example, in Patent Document 1, a light source that irradiates excitation light to an ID identification medium having a light emitting unit including a phosphor, and a light that receives light emitted from the light emitting unit and measures the intensity of the spectrum of the light And a determination system provided with a unit. In this case, the light emitting unit is configured such that a plurality of peaks are included in the spectrum of light emitted from the light emitting unit. Then, based on the intensity ratio of each peak, it is determined whether or not the ID identification medium is regular.

  Further, in Patent Document 2, a light emitting element that irradiates two or more wavelengths of excitation light with respect to a latent image mark formed of a phosphor-bearing material including a phosphor, and light emitted from the latent image mark is received. And a light receiving element that has been proposed. In this case, it is determined whether or not the latent image mark is normal based on whether or not a signal is generated in the light receiving element when two or more excitation lights having different wavelengths are irradiated to the latent image mark. Is done.

International Publication No. 2007/023799 Pamphlet JP 7-33239 A

  In recent years, counterfeit technology has been improved in securities and the like due to advances in analysis technology and the like. For this reason, in order to prevent counterfeiting more reliably, a light emitting medium having a light emitting portion that cannot be easily analyzed is used as securities, etc., and authenticity determination for securities composed of light emitting media can be performed with higher accuracy. It has been demanded.

  An object of this invention is to provide the authenticity determination system and authenticity determination method of the luminescent medium which can solve such a subject effectively.

  In the authenticity determination system for performing authenticity determination on a light emitting medium, the light emitting medium emits light of a first color when irradiated with first invisible light in the first wavelength region, The authenticity determination system includes a light-emitting unit including a phosphor that emits light of the second color when irradiated with second invisible light in the second wavelength region. Light irradiation including a first light source that irradiates the first invisible light at a first irradiation intensity and a second light source that irradiates the light-emitting portion of the light-emitting medium to be determined with a second irradiation intensity to the light emitting unit. A first emission light that is excited by the first invisible light of the first irradiation intensity and emitted from the light emitting part of the light emitting medium to be determined, and a determination target excited by the second invisible light of the second irradiation intensity. Receiving the second emission light emitted from the light emitting part of the light emitting medium of the first emission light, And a second reference irradiation intensity of the first invisible light and a second reference irradiation intensity of the second invisible light irradiated to the light emitting part of the reference light emitting medium. And excited by the first invisible light having the first reference irradiation intensity and excited by the second invisible light having the second reference irradiation intensity and the intensity of the first reference emission light emitted from the light emitting portion of the reference light emitting medium. A database in which information relating to the intensity of the second reference emission light emitted from the light emitting unit of the reference light emitting medium is stored in advance, the first irradiation intensity, the second irradiation intensity, and the first reference irradiation. In consideration of the difference between the intensity and the second reference irradiation intensity, the intensity of the first reference emission light and the intensity of the second reference emission light are corrected, and then the intensity of the first emission light and the first Strength after correction of reference emission And a true / false determination unit that determines the authenticity of the light emitting medium to be determined by comparing the intensity of the second emitted light and the corrected intensity of the second reference emitted light. This is a true / false determination system.

  In the authenticity determination system according to the present invention, the measurement unit further determines a light wavelength of the first emission light and a light wavelength of the second emission light, and the database includes the first reference emission light. Information regarding a light wavelength and a light wavelength of the second reference emission light may be further included. In this case, the authenticity determination unit takes into account the difference between the first irradiation intensity and the second irradiation intensity and the first reference irradiation intensity and the second reference irradiation intensity. Correcting the intensity and the intensity of the second reference emission light, then comparing the intensity and light wavelength of the first emission light with the corrected intensity and light wavelength of the first reference emission light, and the second The authenticity of the light emitting medium to be determined may be determined by comparing the intensity and light wavelength of the emitted light with the corrected intensity and light wavelength of the second reference emitted light.

  In the authenticity determination system according to the present invention, the measurement unit obtains the intensity of the first emission light and the intensity of the second emission light at a plurality of light wavelengths, respectively, and the database stores the first light at a plurality of light wavelengths. Information on the intensity of the first reference emission light and the intensity of the second reference emission light may be further included. In this case, the authenticity determination unit takes into account the difference between the first irradiation intensity and the second irradiation intensity and the first reference irradiation intensity and the second reference irradiation intensity. Correcting the intensity of the first reference emission light and the intensity of the second reference emission light, then comparing the intensity of the first emission light and the corrected intensity of the first reference emission light at a plurality of light wavelengths; and The authenticity of the light emitting medium to be determined may be determined by comparing the intensity of the second emitted light at a plurality of light wavelengths with the corrected intensity of the second reference emitted light.

  In the authenticity determination system according to the present invention, the first invisible light from the first light source and the second invisible light from the second light source may be simultaneously irradiated to the light emitting unit of the light emitting medium to be determined. .

  In the authenticity determination system according to the present invention, the first irradiation intensity of the first invisible light and the second irradiation intensity of the second invisible light that are irradiated from the light irradiation section to the light emitting section of the light emitting medium to be determined can be adjusted. It may be.

  In the authenticity determination system according to the present invention, the light irradiating unit changes the first irradiation intensity and the second irradiation intensity while changing the first invisible light and the second invisible to the light emitting part of the light emitting medium to be determined. The light may be irradiated a plurality of times, and the measurement unit may determine the intensity of the first emission light and the intensity of the second emission light each time the light irradiation unit performs irradiation. In this case, the authenticity determination unit may determine the first irradiation intensity, the second irradiation intensity, the first reference irradiation intensity, and the second reference irradiation intensity for each of a plurality of irradiations by the light irradiation unit. The intensity of the first reference emission light and the intensity of the second reference emission light are corrected, and then the intensity of the first emission light and the intensity after correction of the first reference emission light are corrected. By comparing and comparing the intensity of the second emitted light with the corrected intensity of the second reference emitted light, the authenticity of the light emitting medium to be determined may be determined.

  In the authenticity determination method for performing authenticity determination on a light emitting medium, the light emitting medium emits light of a first color when irradiated with first invisible light in the first wavelength region, A light-emitting unit including a phosphor that emits light of the second color when irradiated with second invisible light in the second wavelength region, and the authenticity determination method is based on the light-emitting unit of the reference light-emitting medium. The first reference irradiation intensity of the first invisible light and the second reference irradiation intensity of the second invisible light, and the light emitting portion of the reference light emitting medium excited by the first invisible light of the first reference irradiation intensity Information on the intensity of the first reference emission light emitted from the second reference emission light and the intensity of the second reference emission light emitted from the light emitting portion of the reference light emitting medium by being excited by the second invisible light having the second reference irradiation intensity. The process of preparing each pre-built database and the judgment target A first irradiation step of irradiating the light emitting part of the optical medium with the first irradiation intensity with the first irradiation intensity; 2 irradiation steps, excited by the first invisible light having the first irradiation intensity and emitted from the light emitting part of the light emitting medium to be determined, and excited by the second invisible light having the second irradiation intensity. A measurement step of receiving the second emission light emitted from the light emitting unit of the light emitting medium to be determined to determine the intensity of the first emission light and the intensity of the second emission light, respectively, the first irradiation intensity and the second In consideration of the difference between the irradiation intensity and the first reference irradiation intensity and the second reference irradiation intensity, the intensity of the first reference emission light and the intensity of the second reference emission light are corrected, and then the first reference emission intensity is corrected. The intensity of the emitted light and the corrected intensity of the first reference emitted light A true / false determination step for comparing the intensity of the second emitted light and the corrected intensity of the second reference emitted light to determine the authenticity of the light emitting medium to be determined. This is a true / false determination method.

  In the measurement step of the authenticity determination method according to the present invention, a light wavelength of the first emission light and a light wavelength of the second emission light are further obtained, and the database includes the first reference emission light Information regarding a light wavelength and a light wavelength of the second reference emission light may be further included. In this case, in the authenticity determination step, taking into account the difference between the first irradiation intensity and the second irradiation intensity and the first reference irradiation intensity and the second reference irradiation intensity, Correcting the intensity and the intensity of the second reference emission light, then comparing the intensity and light wavelength of the first emission light with the corrected intensity and light wavelength of the first reference emission light, and the second The authenticity of the light emitting medium to be determined may be determined by comparing the intensity and light wavelength of the emitted light with the corrected intensity and light wavelength of the second reference emitted light.

  In the measurement step of the true / false determination method according to the present invention, the intensity of the first emission light and the intensity of the second emission light at a plurality of light wavelengths are respectively obtained, and the database includes the first emission light at a plurality of light wavelengths. Information on the intensity of the first reference emission light and the intensity of the second reference emission light may be further included. In this case, in the authenticity determination step, the first and second irradiation intensities and the first reference irradiation intensities and the second reference irradiation intensities are considered in consideration of the first and second reference irradiation intensities. Correcting the intensity of the first reference emission light and the intensity of the second reference emission light, then comparing the intensity of the first emission light and the corrected intensity of the first reference emission light at a plurality of light wavelengths; and The authenticity of the light emitting medium to be determined may be determined by comparing the intensity of the second emitted light at a plurality of light wavelengths with the corrected intensity of the second reference emitted light.

  In the authenticity determination method according to the present invention, the first irradiation step and the second irradiation step may be performed simultaneously.

  In the authenticity determination method according to the present invention, the first irradiation intensity of the first invisible light in the first irradiation step and the second irradiation intensity of the second invisible light in the second irradiation step may be adjustable.

  In the first irradiation step and the second irradiation step of the authenticity determination method according to the present invention, the first irradiation intensity and the second irradiation intensity are changed while the first irradiation intensity of the light emitting medium to be determined is changed to the first emission intensity. The invisible light and the second invisible light are irradiated a plurality of times, and in the measurement step, the intensity of the first emission light and the intensity of the second emission light are the first in the first irradiation step and the second irradiation step. It may be determined for each irradiation of invisible light and second invisible light. In this case, in the authenticity determination step, the first irradiation intensity and the first irradiation for each of a plurality of times of the first invisible light and the second invisible light in the first irradiation step and the second irradiation step. In consideration of the difference between the two irradiation intensities and the first reference irradiation intensity and the second reference irradiation intensity, the intensity of the first reference emission light and the intensity of the second reference emission light are corrected, and then By comparing the intensity of one emission light and the corrected intensity of the first reference emission light, and comparing the intensity of the second emission light and the intensity of the second reference emission light after correction The authenticity determination of the light emitting medium may be performed.

  ADVANTAGE OF THE INVENTION According to this invention, the authenticity determination system and authenticity determination method which perform the authenticity determination with respect to a luminescent medium accurately can be provided.

FIG. 1 is a plan view showing an example of securities constituted by an anti-counterfeit medium comprising a light emitting medium of the present invention. FIG. 2 is a diagram showing an example of the fluorescence emission spectrum of the fluorescent ink contained in the light emitting portion of the light emitting medium of the present invention. FIG. 3 is a diagram showing a true / false determination system according to the first embodiment of the present invention. FIG. 4A is a diagram showing a spectrum of first invisible light having a first reference irradiation intensity and a spectrum of second invisible light having a second reference irradiation intensity in the first embodiment of the present invention. FIG. 4B is a diagram showing spectra of first reference emission light and second reference emission light that are excited by the first invisible light and the second invisible light shown in FIG. 4A and are emitted from the light emitting portion of the reference forgery prevention medium. FIG. 5A is a diagram showing a spectrum of first invisible light having a first irradiation intensity and a spectrum of second invisible light having a second irradiation intensity in the first embodiment of the present invention. FIG. 5B is a diagram showing spectra of the first emission light and the second emission light that are excited by the first invisible light and the second invisible light shown in FIG. 5A and are emitted from the light emitting unit of the forgery prevention medium to be determined. FIG. 6 shows a second modification of the first embodiment of the present invention, in which the first invisible light and the second invisible light shown in FIG. 5A are simultaneously irradiated to the light-emitting portion of the forgery prevention medium to be determined. The figure which shows the light emitted from a light emission part when it hits. FIG. 7 is a diagram showing a true / false determination system according to a second embodiment of the present invention. FIG. 8 is a diagram showing a true / false determination system according to a third embodiment of the present invention. FIG. 9A shows a first reference emission light and a second reference emission which are excited by the first invisible light and the second invisible light and emit light from the light emitting part of the reference anti-counterfeit medium in the third embodiment of the present invention. The figure which shows the spectrum of light. FIG. 9B shows the first emission light and the second emission light that are excited by the first invisible light and the second invisible light and emit light from the light emitting part of the forgery prevention medium to be determined in the third embodiment of the present invention. The figure which shows a spectrum. FIG. 10 is a diagram showing a true / false determination system according to a fourth embodiment of the present invention. FIG. 11A is a diagram illustrating an example in which the spectrum shape of the reference UV-A is different from the spectrum shape of the determination UV-A. FIG. 11B is a diagram showing spectra of first reference emission light and first emission light that are excited by the reference UV-A and the determination UV-A shown in FIG. FIG. 12A is a diagram showing a corrected spectrum of the first reference emission light in the fourth embodiment of the present invention. FIG. 12B is a diagram showing a corrected spectrum of the second reference emission light in the fourth embodiment of the present invention.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, with reference to FIG. 1 and FIG. 2, a forgery prevention medium 10 will be described as a light-emitting medium on which authenticity determination is performed by the authenticity determination system and authenticity determination method of the present invention.

Anti-Counterfeit Medium FIG. 1 is a diagram showing an example of a gift certificate (securities) composed of an anti-counterfeit medium 10 according to the present embodiment. As shown in FIG. 1, the anti-counterfeit medium 10 includes a base material 11 and a light emitting unit 12 formed on the base material 11. In the present embodiment, as will be described later, the light emitting unit 12 functions as an authenticity determination region for determining the authenticity of the forgery prevention medium 10. The light emitting section 12 is formed by printing a fluorescent ink 13 containing a phosphor that emits fluorescence when excited by invisible light.

  The material of the base material 11 used in the forgery prevention medium 10 is not particularly limited, and is appropriately selected according to the type of securities constituted by the forgery prevention medium 10. For example, white polyethylene terephthalate having excellent printability and processability is used as the material of the substrate 11. The thickness of the base material 11 is appropriately set according to the type of securities constituted by the forgery prevention medium 10.

The size of the light emitting unit 12 is not particularly limited, and is appropriately set according to the ease of authenticity determination and the required determination accuracy. For example, the lengths l ₁ and l ₂ of the light emitting unit 12 are in the range of _{1 to} 210 mm and 1 to 300 mm, respectively. Moreover, the thickness of the fluorescent ink 13 printed so as to form the light emitting portion 12 is appropriately set according to the type of securities, the printing method, etc., for example, within the range of 0.3 to 100 μm. ing.

As will be described later, the fluorescent ink 13 contains a predetermined phosphor that does not emit light under visible light but emits light under specific invisible light, for example, a granular pigment. Here, the particle size of the pigment contained in the fluorescent ink 13 is not particularly limited, and various pigments can be used.
For example, the fluorescent ink 13 containing a pigment having a particle diameter in the range of 0.1 to 10 μm, more specifically in the range of 0.1 to 3 μm can be used. In this case, when the fluorescent ink 13 is irradiated with visible light, the light is scattered by the pigment particles. Therefore, when the light emitting unit 12 is viewed under visible light, it is visually recognized as a white region. Further, as described above, the base material 11 in the present embodiment is formed from white polyethylene terephthalate. For this reason, both the base material 11 and the light emission part 12 are visually recognized as a white thing under visible light. Therefore, the light emitting unit 12 is not visually recognized under visible light. This can prevent the forgery prevention medium 10 having the light emitting unit 12 from being easily analyzed.
Moreover, the fluorescent ink 13 containing the pigment which has a particle size of 0.1 micrometer or less may be used. For example, fluorescent ink 13 containing quantum dots as a pigment can be used.

Fluorescent ink Next, the fluorescent ink 13 will be described in more detail with reference to FIG. FIG. 2 is a diagram showing a fluorescence emission spectrum of the fluorescent ink 13.

  In FIG. 2, the fluorescence emission spectrum of the fluorescent ink 13 when irradiated with ultraviolet rays (invisible light) in a wavelength region of 315 to 400 nm (in the first wavelength region), so-called UV-A, and 200 to 280 nm. Both the fluorescence emission spectrum of the fluorescent ink 13 when irradiated with ultraviolet rays (invisible light) in the wavelength region (second wavelength region), so-called UV-C, are shown. Each fluorescence emission spectrum shown in FIG. 2 is standardized so that the peak intensity at the maximum peak is the same.

As shown in FIG. 2, the fluorescent ink 13 emits blue (first color) light having a peak wavelength of about 445 nm when irradiated with UV-A, and has a peak wavelength when irradiated with UV-C. Emits green (second color) light having a wavelength of about 525 nm. As described above, the fluorescent ink 13 includes a so-called dichroic phosphor (phosphor) that emits different colors when irradiated with UV-A and when irradiated with UV-C. Such a dichroic phosphor is configured, for example, by appropriately combining a phosphor excited by UV-A and a phosphor excited by UV-C (for example, JP-A-10-251570). No. publication).
During UV-A irradiation, light having a wavelength of about 525 nm is also emitted as shown in FIG. However, since light having a wavelength of about 525 nm has a lower intensity than light having a peak wavelength of about 445 nm, the light from the fluorescent ink 13 is visually recognized as blue light when irradiated with UV-A. Similarly, at the time of UV-C irradiation, light having a wavelength of about 445 nm is also emitted as shown in FIG. 2, but the light from the fluorescent ink 13 is visually recognized as green light because of its low intensity.

  According to the present embodiment, as described above, the light emitting unit 12 of the forgery prevention medium 10 emits blue (first color) light when irradiated with UV-A and is irradiated with UV-C. A phosphor that emits green (second color) light. For this reason, the analysis of the forgery prevention medium 10 can be made difficult, and thereby the forgery prevention medium 10 can be prevented from being easily forged. Further, as will be described later, the authenticity determination for the anti-counterfeit medium 10 can be performed based on both blue (first color) light and green (second color) light. Accordingly, it is possible to perform the authenticity determination with higher accuracy than in the case where the light emitted from the forgery prevention medium 10 is a single color.

  Further, according to the present embodiment, as shown in FIG. 2, the spectrum of light emitted from the phosphors of the light emitting unit 12 when irradiated with UV-A and UV-C has a substantially single peak. The spectrum is formed from For this reason, the fluorescence which can be used compared with the case where the fluorescent substance which light-emits the light which has a spectrum containing a some peak when only any one of UV-A or UV-C is irradiated in a light emission part. The body choices are wider. Thereby, the light emitting part 12 of the forgery prevention medium 10 can be configured more inexpensively and easily.

  Further, according to the present embodiment, when the ratio of the phosphor excited by UV-A and the phosphor excited by UV-C is adjusted, UV-A and UV-C are irradiated. In addition, it is possible to arbitrarily change the intensity ratio of the spectrum of light emitted from the light emitting unit 12. In contrast, when a phosphor that emits light having a spectrum including a plurality of peaks when only one of UV-A and UV-C is irradiated is used in the light emitting unit 12, the intensity of each peak The ratio is a uniform value. In other words, according to the present embodiment, it is possible to perform authenticity determination of the forgery prevention medium 10 under more various determination conditions.

Authenticity determination system Next, with reference to FIG. 3, the authenticity determination system 50 in the first embodiment of the present invention will be described. The authenticity determination system 50 is a system for determining the authenticity of the forgery prevention medium 10 described above, and is installed in various places where securities comprising the forgery prevention medium 10 are used.

  As shown in FIG. 3, the authenticity determination system 50 includes a light irradiation unit 20 that irradiates the light emitting unit 12 of the anti-counterfeit medium 10 with invisible light, and emission light that is excited by the invisible light and emits light from the light emitting unit 12. And a measurement unit 25 for receiving light. As shown in FIG. 3, the authenticity determination system 50 includes a database 30, an authenticity determination unit that determines authenticity of the forgery prevention medium 10 based on information from the light irradiation unit 20, the measurement unit 25, and the database 30. 35.

  First, an outline of the authenticity determination system 50 will be described. The authenticity determination system 50 compares the information related to the reference anti-counterfeit medium (reference light-emitting medium) 10 acquired in advance with the information related to the determination target anti-counterfeit medium (determination target light-emitting medium) 10. When the two pieces of information substantially match, it is determined that the forgery prevention medium 10 to be determined is a genuine product. Here, the reference anti-counterfeit medium 10 is an anti-counterfeit medium 10 that has already been determined to be a genuine product. The reference forgery prevention medium 10 is obtained from, for example, the publisher of the forgery prevention medium 10. The anti-counterfeit medium 10 to be determined is an anti-counterfeit medium 10 that has not yet been determined whether it is a genuine product, and is, for example, a securities that a customer presents at the time of accounting at a store or the like.

  In the authenticity determination system 50, information related to the reference forgery prevention medium 10 is stored in the database 30 in advance. Information about the forgery prevention medium 10 to be determined is acquired by using the light irradiation unit 20 and the measurement unit 25 described above. Hereinafter, each component of the authenticity determination system 50 will be described in detail.

(Light irradiation part)
As shown in FIG. 3, the light irradiation unit 20 irradiates the light emitting unit 12 of the determination target forgery prevention medium 10 with UV-A (first invisible light) at a first irradiation intensity, And a second light source 22 that irradiates the light emitting portion 12 of the determination target forgery prevention medium 10 with UV-C (second invisible light) at a second irradiation intensity.

  Among these, as the 1st light source 21 which irradiates UV-A (1st invisible light), the high pressure mercury UV lamp whose emission peak wavelength is 365 nm can be used, for example. Moreover, as the 2nd light source 22 which irradiates UV-C (2nd invisible light), the low pressure mercury UV lamp whose emission peak wavelength is 254 nm can be used, for example.

  The first irradiation intensity of UV-A irradiated from the first light source 21 of the light irradiation unit 20 to the light emitting unit 12 of the forgery prevention medium 10 to be determined, and the determination target from the second light source 22 of the light irradiation unit 20 The second irradiation intensity of UV-C irradiated to the light emitting unit 12 of the anti-counterfeit medium 10 may be adjustable. Accordingly, it is possible to perform authenticity determination of the forgery prevention medium 10 under more various determination conditions.

  The specific means for adjusting the first irradiation intensity of UV-A and the second irradiation intensity of UV-C is not particularly limited, and various means can be adopted. For example, the first light source 21 and the second light source 22 are each provided with a shutter whose aperture ratio can be freely adjusted, and by adjusting the aperture ratio of these shutters, the first irradiation intensity of UV-A and the UV− The second irradiation intensity of C may be adjusted. Alternatively, by adjusting the voltages applied to the high pressure mercury UV lamp of the first light source 21 and the low pressure mercury UV lamp of the second light source 22, respectively, the first irradiation intensity of UV-A and the second irradiation intensity of UV-C are obtained. You may adjust.

(Measurement part)
Next, the measurement unit 25 will be described. As illustrated in FIG. 3, the measurement unit 25 includes light (first emission light) emitted from the light emitting unit 12 of the forgery prevention medium 10 to be determined and excited by the UV-A having the first irradiation intensity, Light (second emission light) emitted from the light emitting unit 12 of the anti-counterfeit medium 10 to be determined by being excited by the irradiation intensity UV-C is received. The measurement unit 25 is configured to obtain the intensity of the first emission light and the intensity of the second emission light based on the received first emission light and second emission light, respectively. As such a measuring unit 25, for example, a power meter 26 is used as shown in FIG.

In the power meter 26 shown in FIG. 3, the wavelength range of the detected light may be switchable. For example, the power meter 26 has a first mode for determining the intensity of light in the wavelength range of 400 to 480 nm including blue light, and a second mode for determining the intensity of light in the wavelength range of 490 to 570 nm including green light. You may do it. In this case, even when blue light and green light are incident on the power meter 26 at the same time, the intensities of the blue light and the green light are obtained separately by switching between the first mode and the second mode. Is possible.
The wavelength range of light that can be detected by the power meter 26 is not limited to the above-described wavelength range, and may be arbitrarily settable.

(Database)
Next, the database 30 will be described. The database 30 is for storing in advance information related to the reference forgery prevention medium 10 (reference light emitting medium). Specifically, the database 30 includes a first reference irradiation intensity of UV-A and a second reference irradiation intensity of UV-C that are emitted to the light emitting unit 12 of the reference anti-counterfeit medium 10, and The intensity of light (first reference emission light) emitted from the light emitting portion 12 of the reference anti-counterfeit medium 10 by being excited by UV-A (first invisible light) having one reference irradiation intensity, and the second reference irradiation intensity Information relating to the intensity of light (second reference emission light) emitted from the light emitting unit 12 of the reference forgery prevention medium 10 by being excited by UV-C (second invisible light) is incorporated in advance. Such information is acquired by, for example, the issuer of the forgery prevention medium 10 or the manufacturer of the authenticity determination system 50 and stored in the database 30.

  The light source that generates the above-described first reference irradiation intensity UV-A and second reference irradiation intensity UV-C that is used when acquiring information stored in the database 30 is not particularly limited. For example, the light irradiation unit 20 of the authenticity determination system 50 according to the present embodiment may be used as a light source that generates UV-A and UV-C, or other general-purpose UV-A light source and UV- A C light source may be used.

(Authenticity judgment part)
Next, the authenticity determination unit 35 will be described. The authenticity determination unit 35 determines the authenticity of the anti-counterfeit medium 10 to be determined based on the information from the power meter 26 and the information on the reference anti-counterfeit medium 10 built in the database 30 in advance. Is what you do. As shown in FIG. 3, the authenticity determination unit 35 receives the intensity correction unit 36 to which information from the light irradiation unit 20 and the database 30 is input, and the information from the intensity correction unit 36 and the power meter 26. And a determination unit 37. First, the intensity correction unit 36 will be described.

  Generally, the intensity of the first emission light and the second emission light emitted from the light emitting part 12 increases as the intensity of UV-A and UV-C irradiated to the light emitting part 12 of the forgery prevention medium 10 increases. Further, as described above, the UV-A and UV-C light sources used when acquiring information stored in the database 30 and the light irradiation unit 20 of the authenticity determination system 50 are the same. Not exclusively. Therefore, the first reference irradiation intensity of UV-A and the second reference irradiation intensity of UV-C when acquiring information stored in the database 30 and the light irradiation unit 20 of the authenticity determination system 50 are irradiated. The first irradiation intensity of UV-A and the second irradiation intensity of UV-C are not necessarily the same. For this reason, in order to properly compare the information about the forgery prevention medium 10 to be determined obtained from the power meter 26 with the information about the reference forgery prevention medium 10 built in the database 30 in advance, the above-mentioned first It is necessary to consider the difference between the first irradiation intensity and the second irradiation intensity and the above-described first reference irradiation intensity and second reference irradiation intensity.

  The intensity correction unit 36 is provided in consideration of such points. Specifically, the intensity correction unit 36 considers the difference between the first irradiation intensity and the second irradiation intensity described above and the first reference irradiation intensity and the second reference irradiation intensity described above, and prevents forgery of the determination target. The intensity of the first reference emission light and the intensity of the second reference emission light in the database 30 are corrected so that the information on the medium 10 and the information on the reference forgery prevention medium 10 can be appropriately compared.

  The determination unit 37 includes the first reference emission light intensity and the second reference emission light intensity corrected by the intensity correction unit 36, and the first emission light intensity and the second emission light intensity input from the power meter 26. To determine whether the anti-counterfeit medium 10 is true or false. In this case, for example, the corrected intensity of the first reference emitted light is compared with the intensity of the first emitted light, and the corrected intensity of the second reference emitted light is compared with the intensity of the second emitted light. Thus, the authenticity determination of the forgery prevention medium 10 is performed.

For example, the corrected intensity of the first / second reference emission light (I ′ ₃ _R / I ′ ₄ _R described later) and the intensity of the first / second emission light (I ₃ _M / I ₄ _M described later). When the absolute value of the value obtained by dividing the difference by the corrected intensity (I ′ ₃ _R / I ′ ₄ _R) of the first / second reference emission light is 0.05 or less, the forgery prevention medium 10 is It is determined (see [Equation 1]). In addition, the reference value for authenticity determination used in the comparison is not limited to 0.05, and is appropriately set according to the required accuracy of determination.

  Next, the operation of the present embodiment having such a configuration will be described. Here, first, a method for producing the forgery prevention medium 10 will be described. Next, a method for determining whether the securities comprising the forgery prevention medium 10 are genuine will be described.

First , a base material 11 is prepared. As the base material 11, for example, a base material made of white polyethylene terephthalate having a thickness of 188 μm is used. Next, the light emitting part 12 is formed on the substrate 11 using the fluorescent ink 13.

  In this case, as the fluorescent ink 13, for example, 25% by weight of a dichroic phosphor having a predetermined fluorescence characteristic, 8% by weight of microsilica, 2% by weight of organic bentonite, 50% by weight of alkyd resin, and 15% by weight of an alkylbenzene solvent % Is used as an offset ink. Among these, the dichroic phosphor for the fluorescent ink 13 is, for example, excited by ultraviolet light (UV-C) having a wavelength of 254 nm to emit green light, and excited by ultraviolet light (UV-A) having a wavelength of 365 nm to be blue. A phosphor DE-GB (manufactured by Nemoto Special Chemical) that emits light is used.

  The composition of each component in the fluorescent ink 13 is not limited to the above-described composition, and an optimal composition is set according to the characteristics required for the forgery prevention medium 10.

Authenticity Determination Method Next, a method for determining whether the securities comprising the forgery prevention medium 10 are genuine using the authenticity determination system 50 will be described with reference to FIGS. 3 to 5B.

(Preparing the database)
First, a database 30 in which information related to the reference forgery prevention medium 10 is previously prepared is prepared. Hereinafter, a method of acquiring information stored in the database 30 will be described with reference to FIGS. 4A and 4B.

  First, a reference forgery prevention medium 10 is prepared. Thereafter, UV-A (first invisible light) is irradiated at the first reference irradiation intensity to the light emitting portion 12 of the reference anti-counterfeit medium 10, and the first reference emitted from the light emitting portion 12 at this time is emitted. Measure the intensity of the emitted light. Next, UV-C (second invisible light) is irradiated at the second reference irradiation intensity to the light emitting unit 12 of the reference forgery prevention medium 10, and the second light emitted from the light emitting unit 12 at this time is emitted. Measure the intensity of the reference emission light.

FIG. 4A is a diagram illustrating UV-A and UV-C spectra irradiated to the reference anti-counterfeit medium 10, respectively. In FIG. 4A, the UV-A and UV-C spectra irradiated to the reference anti-counterfeit medium 10 are indicated by reference numerals S ₁ _R and S ₂ _R. In the following description, UV-A and UV-C irradiated to the reference anti-counterfeit medium 10 are referred to as reference UV-A and reference UV-C, respectively.

As shown in FIG. 4A, the first reference irradiation intensity I ₁ _R and the wavelength λ ₁ _R of the reference UV-A are 2000 and 365 nm, respectively, and the second reference irradiation intensity I ₂ _R of the reference UV-C. And wavelengths λ ₂ _R are 2000 and 254 nm, respectively. Note that the units of light intensity in this specification are all arbitrary units (AU).

As shown in FIG. 4A, I ₁ —R indicates the intensity at the peak wavelength of the reference UV-A. The same applies to I ₂ _R. However, the present invention is not limited to this, and is calculated by integrating the spectrum S ₁ _R or S ₂ _R as the first reference irradiation intensity of the reference UV-A and the second reference irradiation intensity of the reference UV-C. Intensity (integrated intensity) may be used.

FIG. 4B is a diagram illustrating the spectra of the first reference emission light and the second reference emission light emitted from the light emitting unit 12 of the reference forgery prevention medium 10. In FIG. 4B, the spectra of the first reference emission light and the second reference emission light are denoted by reference numerals S ₃ _R and S ₄ _R. As shown in FIG. 4B, the intensity I ₃ _R and the wavelength λ ₃ _R of the first reference emission light are 300 and 445 nm, respectively, and the intensity I ₄ _R and the wavelength λ ₄ _R of the second reference emission light are 1200 respectively. And 525 nm.

As shown in FIG. 4B, the intensity I ₃ _R of the first reference emission light indicates the intensity at the peak wavelength of the first reference emission light. The same applies to the intensity I ₄ _R of the second reference emission light. However, the present invention is not limited to this, and the intensity (integrated intensity) calculated by integrating the spectrum S ₃ _R or S ₄ _R is used as the intensity of the first reference emission light and the intensity of the second reference emission light. May be.

Table 1 shows information related to the reference forgery prevention medium 10 stored in the database 30. As shown in Table 1, the database 30 stores information on the intensity of the reference UV-A and the reference UV-C and information on the intensity of the corresponding first reference emission light and second reference emission light. Is done.

(First irradiation step and second irradiation step)
Next, a forgery prevention medium 10 to be determined is prepared. Thereafter, using the first light source 21 of the light irradiation unit 20 of the authenticity determination system 50, UV-A (first invisible light) is applied to the light emitting unit 12 of the determination target forgery prevention medium 10 at the first irradiation intensity. Irradiate (first irradiation step). Next, the second light source 22 of the light irradiation unit 20 is used to irradiate the light emitting unit 12 of the determination target forgery prevention medium 10 with UV-C (second invisible light) at a second irradiation intensity (second). Irradiation step).

FIG. 5A is a diagram showing spectra of UV-A irradiated in the first irradiation step and UV-C irradiated in the second irradiation step, respectively. In FIG. 5A, the UV-A and UV-C spectra irradiated on the forgery prevention medium 10 to be determined are indicated by symbols S ₁ _M and S ₂ _M. Hereinafter, UV-A and UV-C irradiated to the forgery prevention medium 10 to be determined are referred to as determination UV-A and determination UV-C, respectively.

As shown in FIG. 5A, the first irradiation intensity I ₁ _M and the wavelength λ ₁ _M of the determination UV-A are 2000 and 365 nm, respectively, and the second irradiation intensity I ₂ _M and the wavelength of the determination UV-C. λ ₂ —M is 1000 and 254 nm, respectively. As shown in FIG. 5A, I ₁ —M indicates the intensity at the peak wavelength of the determination UV-A. The same applies to I ₂ _M. However, the present invention is not limited to this, and the intensity calculated by integrating the spectrum S ₁ _M or S ₂ _M as the first irradiation intensity of the determination UV-A and the second irradiation intensity of the determination UV-C. (Integral intensity) may be used.

(Measurement process)
Next, using the power meter 26, the first emission light that is excited by the determination UV-A and emits light from the light emitting unit 12 of the determination target forgery prevention medium 10, and the determination target that is excited by the determination UV-C The second emission light emitted from the light emitting unit 12 of the anti-counterfeit medium 10 is received, and the intensity of the first emission light and the intensity of the second emission light are measured.

FIG. 5B is a diagram illustrating the spectra of the first emission light and the second emission light emitted from the light emitting unit 12 of the forgery prevention medium 10 to be determined. In FIG. 5B, the spectra of the first emission light and the second emission light are indicated by the symbols S ₃ —M and S ₄ —M. As shown in FIG. 5B, the first emission light intensity I ₃ —M and the wavelength λ ₃ —M are 300 and 445 nm, respectively, and the second reference emission light intensity I ₄ —M and the wavelength λ ₄ —M are 600 and It is 525 nm.

As shown in FIG. 5B, the intensity I ₃ _M of the first emitted light indicates the intensity at the peak wavelength of the first emitted light. The same applies to the intensity I ₄ _M of the second emission light. However, the present invention is not limited to this, and the intensity (integrated intensity) calculated by integrating the spectrum S ₃ _M or S ₄ _M is used as the intensity of the first emission light and the intensity of the second emission light. Also good.

Table 2 shows information related to the forgery prevention medium 10 to be determined. Specifically, Table 2 shows information regarding the intensities of the determination UV-A and the determination UV-C irradiated to the determination target forgery prevention medium 10. Table 2 also shows information on the intensity of the first emission light and the second emission light measured by the power meter 26.

ここで上述のように、第１参照照射強度I_１＿Ｒは２０００となっており、第１照射強度I_１＿Ｍも２０００となっている。このため、第１参照放出光の補正後の強度I’_３＿Ｒとして、２０００／２０００×３００＝３００が算出される。 (Correction process)
Next, in consideration of the difference between the first reference irradiation intensity I ₁ _R and the second reference irradiation intensity I ₂ _R, the first irradiation intensity I ₁ _M, and the second irradiation intensity I ₂ _M by the intensity correction unit 36, The intensity I ₃ —R of the first reference emission light and the intensity I ₄ —R of the second reference emission light in the database 30 are corrected. Specifically, the corrected intensity I ′ ₃ _R of the first reference emission light is calculated based on the following [Equation 2].

Here, as described above, the first reference irradiation intensity I ₁ —R is 2000, and the first irradiation intensity I ₁ —M is also 2000. Therefore, 2000/2000 × 300 = 300 is calculated as the corrected intensity I ′ ₃ —R of the first reference emission light.

ここで上述のように、第２参照照射強度I_２＿Ｒは２０００となっており、一方、第２照射強度I_２＿Ｍは１０００となっている。このため、第２参照放出光の補正後の強度I’_４＿Ｒとして、１０００／２０００×１２００＝６００が算出される。 Similarly, the corrected intensity I ′ ₄ _R of the second reference emission light is calculated based on the following [Equation 3].

Here, as described above, the second reference irradiation intensity I ₂ —R is 2000, while the second irradiation intensity I ₂ —M is 1000. For this reason, 1000/2000 × 1200 = 600 is calculated as the corrected intensity I ′ ₄ _R of the second reference emission light.

(Judgment process)
Next, the determination unit 37 corrects the intensity I ′ ₃ _R of the first reference emission light and the intensity I ′ ₄ _R of the second reference emission light, and the intensity I of the first emission light measured by the power meter 26. ₃ by comparing the _M and second emission light intensity I ₄ _M, performing authenticity determination of the anti-counterfeit medium 10 to be determined. In this case, the specific comparison method is not particularly limited, and it is determined whether or not the forgery prevention medium 10 to be determined is regular based on the above [Equation 1] and the like.

Thus, according to the present embodiment, the authenticity determination system 50 includes the light irradiation unit 20 that irradiates the light emitting unit 12 of the determination target forgery prevention medium 10 with the invisible light, and the determination target forgery prevention medium 10. Based on the information from the measuring unit 25 that measures the intensity of light emitted from the light emitting unit 12, the database 30 in which information about the anti-counterfeit medium 10 for reference is built in, and the information from the measuring unit 25 and the database 30, And a true / false determination unit 35 that performs authenticity determination of the forgery prevention medium 10 to be determined. Among these, the light irradiation unit 20 includes a first light source 21 that irradiates the light emitting unit 12 of the determination target forgery prevention medium 10 with UV-A at a first irradiation intensity I ₁ —M, and a determination target forgery prevention medium 10. And a second light source 22 that irradiates the light emitting unit 12 with UV-C at a second irradiation intensity I ₂ —M. In this way, by performing authenticity determination of the anti-counterfeit medium 10 using both UV-A and UV-C, authenticity determination for the anti-counterfeit medium 10 can be performed strictly.

According to this embodiment, the measurement unit 25, a first emission light emitted from the light emitting portion 12 of the first irradiation intensity I ₁ _M anti-counterfeit medium 10 to be determined is excited by UV-A of the The second emission light which is excited by the UV-C having the two irradiation intensity I ₂ _M and is emitted from the light emitting unit 12 of the forgery prevention medium 10 to be determined is received, and the intensity I ₃ _M of the first emission light and the second The intensity I ₄ _M of the emitted light is obtained respectively. The database 30 also includes a UV-A first reference irradiation intensity I ₁ _R and a UV-C second reference irradiation intensity I ₂ _R irradiated to the light emitting unit 12 of the reference forgery prevention medium 10, and The intensity I ₃ _R of the first reference emission light that is excited by the UV-A of the first reference irradiation intensity I ₁ _R and emits light from the light emitting unit 12 of the reference forgery prevention medium 10, and the second reference irradiation intensity I ₂ _R Information relating to the intensity I ₄ _R of the second reference emission light emitted from the light emitting unit 12 of the reference anti-counterfeit medium 10 by being excited by the UV-C is previously incorporated. Then, the intensity correction unit 36 of the authenticity determination unit 35 relates the first reference irradiation intensity I ₁ _R, the second reference irradiation intensity I ₂ _R, the first irradiation intensity I ₁ _M, and the second irradiation intensity I ₂ _M. In consideration of (difference), the intensity I ₃ _R of the first reference emission light and the intensity I ₄ _R of the second reference emission light are corrected. Thereafter, the determination unit 37 of the authenticity determination unit 35 compares the intensity I ₃ —M of the first emitted light with the corrected intensity I ′ ₃ —R of the first reference emitted light, and the intensity I of the second emitted light I ₄ _M and by comparing the intensities I _'4 _R corrected second reference emission light performs authenticity determination of anti-counterfeit medium 10. For this reason, the authenticity determination with respect to the forgery prevention medium 10 can be performed with high accuracy.

First Modification In this embodiment, the intensity I ′ ₃ —R after the correction of the first reference emission light is compared with the intensity I ₃ —M of the first emission light, and the correction of the second reference emission light is performed. by comparing the post-intensity I _'4 _R and second emission light intensity I ₄ _M, false determination of anti-counterfeit medium 10 is an example to be performed. However, the present invention is not limited to this. For example, the intensity ratio of the corrected reference intensity I ′ ₃ —R of the first reference emission light and the corrected reference intensity I ′ ₄ —R of the second reference emission light (reference emission light). Intensity ratio), and then the intensity ratio (emission light intensity ratio) between the intensity I ₃ _M of the first emitted light and the intensity I ₄ _M of the second emitted light, and the reference emitted light intensity ratio and the emission The authenticity of the anti-counterfeit medium 10 may be determined by comparing the light intensity ratio. As a result, as described below, even if the intensity I ₃ _M of the first emission light and the intensity I ₄ _M of the second emission light vary due to various factors, the authenticity determination of the anti-counterfeit medium 10 can be accurately performed. It becomes possible to carry out.

For example, it is considered that there are variations (individual differences) in the thickness and concentration of the fluorescent ink 13 (phosphor) constituting the light emitting unit 12 of the determination target forgery prevention medium 10. In addition, when authenticity determination is performed by the authenticity determination system 50, the intensity of the invisible light irradiated from the light irradiation unit 20 to the light emitting unit 12 of the determination target forgery prevention medium 10 and the placement of the determination target forgery prevention medium 10 are performed. It is conceivable that the location or the installation location of the power meter 26 for measuring the intensity of the emitted light emitted from the light emitting unit 12 varies to some extent for each authenticity determination. If there is such variation, it is considered that the measured values of the intensity I ₃ —M of the first emission light and the intensity I ₄ —M of the second emission light vary. Moreover, the values of the intensity I ₃ —M of the first emission light and the intensity I ₄ —M of the second emission light measured over time due to the aging of the phosphor used in the light emitting unit 12 of the forgery prevention medium 10 to be determined. It is possible to change. Therefore, when the authenticity determination is performed based on the magnitudes of the values of the first emission light intensity I ₃ —M and the second emission light intensity I ₄ —M, it is considered that an erroneous determination is made with a predetermined probability. .

On the other hand, according to the present modification, the authenticity determination is performed based on the intensity ratio (emission light intensity ratio) between the intensity I ₃ —M of the first emission light and the intensity I ₄ —M of the second emission light. In this case, even if the thickness and concentration of the fluorescent ink 13 (phosphor) constituting the light emitting portion 12 of the forgery prevention medium 10 to be determined vary, the intensity I ₃ —M of the first emission light and the second emission light Since the intensity I ₄ _M of the light beam fluctuates in the same manner, the emission light intensity ratio is substantially constant. Thereby, the authenticity determination of the forgery prevention medium 10 can be performed with higher accuracy.

For example, when the absolute value of a value obtained by dividing the difference between the reference emission light intensity ratio and the emission light intensity ratio by the reference emission light intensity ratio is 0.05 or less, the forgery prevention medium 10 is determined to be a genuine product ([several 4]). In addition, the reference value for authenticity determination used in the comparison is not limited to 0.05, and is appropriately set according to the required accuracy of determination.

In the second modified example and the present embodiment, first, UV-A for determination from the first light source 21 is irradiated to the light emitting unit 12 of the forgery prevention medium 10 to be determined (first irradiation step), and then An example is shown in which the determination UV-C from the second light source 22 is irradiated to the light emitting unit 12 of the forgery prevention medium 10 to be determined (second irradiation step). However, the invention is not limited to this, and the determination UV-A from the first light source 21 and the determination UV-C from the second light source 22 are applied to the light emitting unit 12 of the forgery prevention medium 10 to be determined. It may be irradiated at the same time. That is, the first irradiation process and the second irradiation process may be performed simultaneously.

In this case, the first emission light that is excited by the determination UV-A and emitted from the light emitting unit 12 of the determination target anti-counterfeit medium 10 and the determination target anti-counterfeit medium 10 excited by the determination UV-C. The second emission light emitted from the light emitting unit 12 reaches the power meter 26 at the same time. FIG. 6 is a diagram illustrating a spectrum S _OUT —M of light reaching the power meter 26. As illustrated in FIG. 6, the spectrum S _OUT —M is obtained by adding the spectrum S ₃ —M of the first emission light and the spectrum S ₄ —M of the second emission light.

In the power meter 26, measurement in the first mode for light in the wavelength range of 400 to 480 nm and measurement in the second mode for light in the wavelength range of 490 to 570 nm are separately performed. To be implemented. Here, as shown in FIG. 6, the light in the wavelength region of 400 to 480 nm includes not only the first emission light but also part of the second emission light. For this reason, the intensity I _OUT —M (λ ₃ ) obtained by the measurement in the first mode is generally larger than the intensity I ₃ —M of the first emission light. Similarly, the light in the wavelength region of 490 to 570 nm includes not only the second emission light but also a part of the first emission light. For this reason, the intensity I _OUT —M (λ ₄ ) obtained by the measurement in the second mode is generally larger than the intensity I ₄ —M of the second emission light.

Then, by comparing the above-described strengths I _{OUT —} M (λ ₃ ) and I _{OUT —} M (λ ₄ ) with information related to the reference anti-counterfeit medium 10 built in the database 30, the anti-counterfeit medium 10 Authenticity is determined. In this case, the information stored in the database 30 may be obtained by simultaneously irradiating the reference anti-counterfeit medium 10 with the reference UV-A and the reference UV-C. . That is, the power obtained by adding the first reference emission light and the second reference emission light emitted by simultaneously irradiating the reference UV-A and the reference UV-C to the reference anti-counterfeit medium 10 is the power. Information relating to the intensity obtained by the measurement in the first mode and the second mode of the meter 26 may be incorporated in the database 30.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment shown in FIG. 7, the intensity and light wavelength of the first emission light are compared with the intensity and light wavelength of the first reference emission light, and the intensity and light wavelength of the second emission light are compared with the first wavelength. 2. The authenticity determination of the forgery prevention medium 10 is performed by comparing the intensity of the reference emission light and the light wavelength. In the second embodiment shown in FIG. 7, the same parts as those in the first embodiment shown in FIGS. 1 to 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

True / False Judgment System FIG. 7 is a diagram showing the true / false judgment system 50 in the present embodiment. As shown in FIG. 7, in the present embodiment, a spectrum analyzer 27 that measures the intensities and optical wavelengths of the first emission light and the second emission light is used as the measurement unit 25. As an example of the spectrum analyzer 27, for example, a spectrofluorometer F4500 manufactured by Hitachi High-Technologies Corporation can be cited.

Authenticity determination method Next, the operation of the present embodiment having such a configuration will be described. Here, a method for determining whether the securities comprising the anti-counterfeit medium 10 are legitimate will be described.

(Preparing the database)
First, a database 30 in which information related to the reference forgery prevention medium 10 is previously prepared is prepared. In the present embodiment, as shown in Table 3, the database 30 includes not only information on intensity but also light wavelengths for the reference UV-A, the reference UV-C, the first reference emission light, and the second reference emission light. Also includes information about.

(First irradiation step and second irradiation step)
Next, a forgery prevention medium 10 to be determined is prepared. Thereafter, using the first light source 21 of the light irradiation unit 20 of the authenticity determination system 50, the determination UV-A is irradiated to the light emitting unit 12 of the determination target forgery prevention medium 10 with the first irradiation intensity (first). 1 irradiation step). Next, using the second light source 22 of the light irradiation unit 20, the determination UV-C is irradiated with the second irradiation intensity to the light emitting unit 12 of the determination target forgery prevention medium 10 (second irradiation step).

(Measurement process)
Next, using the spectrum analyzer 27, the first emission light that is excited by the determination UV-A and emits light from the light emitting unit 12 of the determination target forgery prevention medium 10, and the determination target that is excited by the determination UV-C The intensity and light wavelength of the second emission light emitted from the light emitting unit 12 of the anti-counterfeit medium 10 are measured. Table 4 shows information obtained by the measurement and information on UV-A for determination and UV-C for determination.

(Correction process)
Next, in consideration of the difference between the first reference irradiation intensity I ₁ _R and the second reference irradiation intensity I ₂ _R, the first irradiation intensity I ₁ _M, and the second irradiation intensity I ₂ _M by the intensity correction unit 36, The intensity I ₃ —R of the first reference emission light and the intensity I ₄ —R of the second reference emission light in the database 30 are corrected. Since the correction process is substantially the same as the correction process in the first embodiment described above, detailed description thereof is omitted.

(Judgment process)
Next, the determination unit 37 compares the intensity _{I '3} _R corrected first reference emission light and the light wavelength lambda ₃ _R, the intensity of the first emission light _I 3 _M and light wavelength lambda ₃ _M. In addition, the corrected intensity I ′ ₄ —R and optical wavelength λ ₄ —R of the second reference emission light are compared with the intensity I ₄ —M and optical wavelength λ ₄ —M of the second emission light. Thereby, it is determined whether or not the forgery prevention medium 10 to be determined is genuine. For example, regarding the optical wavelength, the difference between the optical wavelength λ ₃ —R of the first reference emission light and the optical wavelength λ ₃ —M of the first emission light is 5 nm or less, and the optical wavelength λ ₄ —R of the second reference emission light is When the difference between the light wavelengths λ ₄ _M of the second emitted light is 5 nm or less, it is determined to be acceptable. The strength is determined in the same manner as in the first embodiment. In addition, the reference value for authenticity determination used when comparing the light wavelengths is not limited to 5 nm, and is appropriately set according to the required determination accuracy.

Thus, according to the present embodiment, not only the intensity I ₃ _M of the first emission light and the intensity I ₄ _M of the second emission light, but also the light wavelength λ ₃ _M of the first emission light and the second emission light. Considering the optical wavelength λ ₄ —M, the authenticity determination of the forgery prevention medium 10 is performed. For this reason, the authenticity determination can be performed with higher accuracy, thereby making it more difficult to forge the anti-counterfeit medium 10.

  In the present embodiment, first, UV-A for determination from the first light source 21 is irradiated to the light emitting unit 12 of the forgery prevention medium 10 to be determined (first irradiation step), and then from the second light source 22. In this example, the determination UV-C is irradiated to the light emitting unit 12 of the forgery prevention medium 10 to be determined (second irradiation step). However, the present invention is not limited to this, and the determination UV-A from the first light source 21 and the determination from the second light source 22 are the same as in the case of the second modification of the first embodiment described above. UV-C may be simultaneously irradiated on the light emitting unit 12 of the forgery prevention medium 10 to be determined.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS. 8 to 9B. In the third embodiment shown in FIGS. 8 to 9B, the intensity of the first emission light and the intensity of the first reference emission light at a plurality of light wavelengths are compared, and the second emission light at a plurality of light wavelengths is compared. The authenticity of the forgery prevention medium 10 is determined by comparing the intensity of the light and the intensity of the second reference emission light. In the third embodiment shown in FIG. 8 to FIG. 9B, the same parts as those in the first embodiment shown in FIG. 1 to FIG. 6 and the second embodiment shown in FIG. Detailed description is omitted.

True / False Judgment System FIG. 8 is a diagram showing the true / false judgment system 50 in the present embodiment. As shown in FIG. 8, in the present embodiment, the authenticity determination unit 35 calculates a correlation coefficient between the intensity of the first emitted light and the intensity of the first reference emitted light at a plurality of light wavelengths, In addition, a calculation unit 38 is further included for calculating a correlation coefficient between the intensity of the second emission light and the intensity of the second reference emission light at a plurality of light wavelengths.

Authenticity determination method Next, the operation of the present embodiment having such a configuration will be described. Here, a method for determining whether the securities comprising the anti-counterfeit medium 10 are legitimate will be described.

(Preparing the database)
First, a database 30 in which information related to the reference forgery prevention medium 10 is previously prepared is prepared. In the present embodiment, as shown in FIG. 9A and Table 5, the database 30 has a plurality of optical wavelengths λ ₃ (k) (k = 1 to 2) for the first reference emission light represented by the spectrum S ₃ _R. 100) and information on the intensity I ₃ _R (k) (k = 1 to 100) of the first reference emission light. Further, the database 30 relates to the second reference emission light represented by the spectrum S ₄ _R, and the intensity I ₄ _R (m) of the second reference emission light at a plurality of light wavelengths λ ₄ (m) (m = 1 to 100). (M = 1 to 100). Here, each of λ ₃ (k) and λ ₄ (m) is assigned a value obtained by dividing the light wavelength range of 400 to 700 nm by 100. Note that the optical wavelength range and resolution (number of divisions) assigned to λ ₃ (k) and λ ₄ (m) are not limited to the above values, and are set as appropriate according to the accuracy required for authenticity determination. Is done.

(First irradiation step and second irradiation step)
Next, a forgery prevention medium 10 to be determined is prepared. Thereafter, using the first light source 21 of the light irradiation unit 20 of the authenticity determination system 50, the determination UV-A is irradiated to the light emitting unit 12 of the determination target forgery prevention medium 10 with the first irradiation intensity (first). 1 irradiation step). Next, using the second light source 22 of the light irradiation unit 20, the determination UV-C is irradiated with the second irradiation intensity to the light emitting unit 12 of the determination target forgery prevention medium 10 (second irradiation step).

(Measurement process)
Next, by using the spectrum analyzer 27, the first emission light that is excited by the determination UV-A and emits light from the light emitting unit 12 of the determination target forgery prevention medium 10 has a plurality of light wavelengths λ ₃ (k) ( The intensity I ₃ _M (k) (k = 1 to 100) at k = 1 to 100) is obtained (see FIG. 9B and Table 6). Similarly, by using the spectrum analyzer 27, a plurality of light wavelengths λ ₄ (m) (for the second emission light that is excited by the determination UV-C and emits light from the light emitting unit 12 of the determination target forgery prevention medium 10. The intensity I ₄ _M (m) (m = 1 to 100) at m = 1 to 100) is obtained.

(Correction process)
Next, in consideration of the difference between the first reference irradiation intensity I ₁ _R and the second reference irradiation intensity I ₂ _R, the first irradiation intensity I ₁ _M, and the second irradiation intensity I ₂ _M by the intensity correction unit 36, The first reference emission light intensity I ₃ _R (k) and the second reference emission light intensity I ₄ _R (k) in the database 30 are corrected. More specifically, the corrected intensity I ′ ₃ _R (k) of the first reference emission light is calculated based on the following [Equation 5].

Similarly, the corrected intensity I ′ ₄ _R (m) of the second reference emission light is calculated based on the following [Equation 6].

(Calculation process)
Next, the calculation unit 38 calculates the corrected intensity I ′ ₃ —R (k) of the first reference emission light and the measured intensity I ₃ —M (first emission light) based on the following [Equation 7]. Correlation coefficient R_I ₃ with k) is calculated.

Similarly, the calculation unit 38 calculates the corrected intensity I ′ ₄ _R (m) of the second reference emission light and the measured intensity I ₄ _M of the second emission light based on the following [Equation 8]. Calculate correlation coefficient R_I ₄ with (m)

(Judgment process)
Next, based on the calculated correlation coefficient R_I ₃ and correlation coefficient R_I ₄ , the determination unit 37 determines whether or not the forgery prevention medium 10 is genuine. For example, when the correlation coefficient R_I ₃ and the correlation coefficient R_I ₄ are in the range of 0.8 to 1.0, respectively, it is determined that the forgery prevention medium 10 is regular. Note that the reference value of the correlation coefficient at the time of authenticity determination is not limited to 0.8 to 1.0, and is appropriately set according to the required determination accuracy.

Thus, according to the present embodiment, the authenticity determination of the forgery prevention medium 10 is performed in consideration of the intensity I ₃ —M of the first emission light and the intensity I ₄ —M of the second emission light at a plurality of light wavelengths. Is called. For this reason, the authenticity determination can be performed with higher accuracy, thereby making it more difficult to forge the anti-counterfeit medium 10.

In the present embodiment, first, UV-A for determination from the first light source 21 is irradiated to the light emitting unit 12 of the forgery prevention medium 10 to be determined (first irradiation step), and then from the second light source 22. In this example, the determination UV-C is irradiated to the light emitting unit 12 of the forgery prevention medium 10 to be determined (second irradiation step). However, the present invention is not limited to this, and the determination UV-A from the first light source 21 and the determination from the second light source 22 are the same as in the case of the second modification of the first embodiment described above. UV-C may be simultaneously irradiated on the light emitting unit 12 of the forgery prevention medium 10 to be determined. In this case, the spectrum analyzer 27 obtains intensities at a plurality of wavelengths with respect to a spectrum S _OUT —M (see FIG. 6) obtained by adding the spectrum S ₃ —M of the first emission light and the spectrum S ₄ —M of the second emission light. . In addition, the first reference emission light and the second reference emission light emitted by simultaneously irradiating the reference anti-counterfeit medium 10 with the spectrum S _OUT — M, the reference UV-A, and the reference UV-C. The calculation unit 38 calculates a correlation coefficient between the light spectrum obtained by adding together. Then, the authenticity determination of the forgery prevention medium 10 is performed based on the calculated correlation coefficient.

  Further, in the present embodiment, an example in which the authenticity determination of the forgery prevention medium 10 is performed based on the correlation coefficient calculated by the calculation unit 38 is shown. However, the present invention is not limited to this. The intensity of the first emitted light and the intensity of the first reference emitted light at a plurality of light wavelengths are compared by various methods, and the second emitted light at the plurality of light wavelengths is compared. By comparing the intensity and the intensity of the second reference emission light, the authenticity determination of the anti-counterfeit medium 10 can be performed.

Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to FIGS. 10 to 12B. In the fourth embodiment shown in FIG. 10 to FIG. 12B, it is built in the database based on the spectra of determination UV-A and determination UV-C irradiated from the irradiation unit 20 to the forgery prevention medium 10. The spectra of the first reference emission light and the second reference emission light being corrected are corrected. In the fourth embodiment shown in FIGS. 10 to 12B, the first embodiment shown in FIGS. 1 to 6, the second embodiment shown in FIG. 7, and the third embodiment shown in FIGS. The same parts as those in the embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

(Task)
First, the problem solved by the authenticity determination system 50 according to the present embodiment will be described with reference to FIGS. 11A and 11B. FIG. 11A is a diagram illustrating an example of the spectrum S ₁ _M of the determination UV-A and the spectrum S ₁ _R of the reference UV-A, and FIG. 11B is a determination UV-A and a reference UV illustrated in FIG. 11A. is a diagram showing a spectrum S ₃ _M and spectrum S ₃ _R first reference emission light of the first emission light emitted from the light emitting portion 12 of the anti-counterfeit medium 10 is excited by -A. In FIG. 11A, the intensity of the determination UV-A obtained by integrating the spectrum S ₁ —M and the intensity of the reference UV-A obtained by integrating the spectrum S ₁ —R are substantially the same. .

In general, the measurement for acquiring information related to the reference anti-counterfeit medium 10 incorporated in the database 30 and the measurement for acquiring information related to the determination target anti-counterfeit medium 10 are performed at different places and opportunities. The For this reason, as shown in FIG. 11A, for the reference UV-A used in the measurement for the database 30 and the determination UV-A used in the measurement for authenticity determination, the integrated intensity ( A situation may occur in which the intensities obtained by integrating the spectra of the respective UV-A's with respect to the wavelength are substantially the same, but the spectrum shapes are different. In this case, even if the forgery prevention medium 10 to be determined is a genuine product, as shown in FIG. 11B, the light is emitted from the light emitting unit 12 of the reference forgery prevention medium 10 by being excited by the reference UV-A. There occurs a situation in which the spectrum S ₃ _R of the 1 reference emission light and the spectrum S ₃ _M of the first emission light that is excited by the determination UV-A and emits light from the light emitting unit 12 of the determination target forgery prevention medium 10 are different. It is possible.

Although not shown, the reference UV-A used in the measurement for the database 30 and the determination UV-A used in the measurement for authenticity determination have substantially the same intensity at the peak wavelength. However, situations may arise where the spectral shapes are different. Also in this case, even if the forgery prevention medium 10 to be determined is a genuine product, the first reference emission light emitted from the light emitting unit 12 of the reference forgery prevention medium 10 by being excited by the reference UV-A. spectrum S ₃ _R, a spectrum S ₃ _M first emission light emitted from the light emitting portion 12 of the anti-counterfeit medium 10 to be determined is excited by determination UV-a it is conceivable that the situation that different results.

  Accordingly, when the spectrum shapes of the reference UV-A and the determination UV-A are greatly different, only the correction of the first reference emission light is performed based on the integrated intensity of the reference UV-A or the intensity at the peak wavelength. Then, it is conceivable that the true / false judgment cannot be performed with high accuracy. The present embodiment relates to a true / false determination system 50 that can effectively solve such a problem. More specifically, the present invention relates to a true / false determination system 50 capable of appropriately correcting the spectrum of the first reference emission light in consideration of the difference in spectrum shape between the reference UV-A and the determination UV-A. It is.

  Although not shown, it is conceivable that the same situation occurs when the light emitting unit 12 is irradiated with UV-C. Therefore, according to the authenticity determination system 50 according to the present embodiment, the spectrum of the second reference emission light is also appropriately corrected in consideration of the difference in spectrum shape between the reference UV-C and the determination UV-C. The

Authenticity determination system FIG. 10 is a diagram showing an authenticity determination system 50 in the present embodiment. As shown in FIG. 10, the authenticity determination unit 35 takes into account the difference in spectrum shape between the reference UV-A and reference UV-C and the determination UV-A and determination UV-C. A spectrum correcting unit 36A that corrects the spectra of the reference emission light and the second reference emission light is provided.

Authenticity determination method Next, the operation of the present embodiment having such a configuration will be described. Here, a method for determining whether the securities comprising the anti-counterfeit medium 10 are legitimate will be described.

(Preparing the database)
First, a database 30 in which information related to the reference forgery prevention medium 10 is previously prepared is prepared. Table 7 shows information built in the database 30. As shown in Table 7, the database 30 is irradiated to the medium for preventing forgery 10 for reference light in the UV-A range (light wavelength 315~400nm range) different wavelengths λ ₁ _1~λ ₁ _100 contained when, has information about the spectrum _{S 3 _R_1~S} 3 _R_100 of light emitted from the light emitting portion 12 of the anti-counterfeit medium 10 for reference. Each spectrum _{S 3 _R_1~S} 3 _R_100, each wavelength lambda ₁ _1～Ramuda ₁ each first reference illumination intensity of light _100 irradiating the medium for preventing forgery 10 for reference is 1 (unit strength) The spectrum of the case.

Next, a method for acquiring the information shown in Table 7 will be described. First, a reference forgery prevention medium 10 is prepared. Next, light of various wavelengths λ ₁ _ _{1 to} λ ₁ _100 is sequentially irradiated to the light emitting unit 12 of the reference forgery prevention medium 10. Here, for example, a value obtained by dividing the range of the light wavelength of 315 to 400 nm by 100 is assigned to the wavelengths λ ₁ _ _{1 to} λ ₁ _100. Then, the spectrum of the emitted light emitted from the light emitting unit 12 of the reference forgery prevention medium 10 is measured. Thus, as shown in Table 7, regarding the case where UV-A is irradiated to the light emitting portion 12 of the reference forgery prevention medium 10, the wavelength of the light irradiated to the light emitting portion 12 and the light emission at that time are emitted. Information representing the relationship with the spectrum of the light emitted from the unit 12 is obtained.

Similarly, regarding the case where the light emitting part 12 of the reference anti-counterfeit medium 10 is irradiated with UV-C, the wavelength of the light emitted to the light emitting part 12 and the light emitted from the light emitting part 12 at that time Information representing the relationship with the spectrum is obtained, and the information is stored in the database 30. Here, for example, a value obtained by dividing the range of the optical wavelength 200 to 280 nm by 100 is assigned to the wavelengths λ ₂ _ _{1 to} λ ₂ _100.

(First irradiation step and second irradiation step)
Next, a forgery prevention medium 10 to be determined is prepared. Thereafter, using the first light source 21 of the light irradiation unit 20 of the authenticity determination system 50, the determination UV-A is irradiated to the light emitting unit 12 of the determination target forgery prevention medium 10 with the first irradiation intensity (first). 1 irradiation step). Next, using the second light source 22 of the light irradiation unit 20, the determination UV-C is irradiated with the second irradiation intensity to the light emitting unit 12 of the determination target forgery prevention medium 10 (second irradiation step).
Further, information related to the intensity _{I 1 _M_1~I} 1 _M_100 at each wavelength λ ₁ _1~λ ₁ _100 for judgment UV-A used in this is sent to the spectrum correction unit 36A of the authenticity determination section 35. The information about each intensity _{I 1 _M_1~I} 1 _M_100 may first light source 21 have previously, or, obtained by measuring the light from the first light source 21 by using a spectrum analyzer 27 May be.
Similarly, information relating to the intensity _{I 2 _M_1~I} 2 _M_100 at each wavelength λ ₂ _1~λ ₂ _100 for judgment UV-C is sent to the spectrum correction unit 36A of the authenticity determination section 35.

(Measurement process)
Next, the spectrum analyzer 27 is used to measure the spectrum S ₃ _M of the first emitted light that is excited by the determination UV-A and emits light from the light emitting unit 12 of the determination target forgery prevention medium 10. Similarly, the spectrum S ₄ _M of the second emission light that is excited by the determination UV-C and emits light from the light emitting unit 12 of the determination target forgery prevention medium 10 is measured using the spectrum analyzer 27.

(Correction process)
Next, the spectrum correction unit 36, the information built into the database 30, information about each of the first irradiation intensity _{I 1 _M_1~I} 1 _M_100 at each wavelength λ ₁ _1~λ ₁ _100 for judgment UV-A Based on the above, the corrected spectrum S ′ ₃ —R of the first reference emission light is calculated. Specifically, as shown in FIG. 12A, first, the data of each spectrum S ₃ _R_n built in the database 30 is multiplied by the intensity I ₁ _M_n at the wavelength λ ₁ _n corresponding to the UV-A for determination. To calculate the spectrum S ′ ₃ —n. Next, each spectrum S ′ _{3 —} n is added. Thereby, as shown in FIG. 12A, the corrected spectrum S ′ ₃ _R of the first reference emission light is calculated. Similarly, as shown in FIG. 12B, the corrected spectrum S ′ ₄ _R of the second reference emission light is calculated. This process is expressed by the following [Equation 9].

なお〔数１０〕において、I_１＿Ｍ（λ）は、波長λにおける判定用ＵＶ−Ａの強度を表しており、Ｓ_３＿Ｒ（λ）は、単位強度を有する波長λの光により励起されて参照用の偽造防止媒体１０の発光部１２から発光される光のスペクトルを表している。同様に、I_２＿Ｍ（λ）は、波長λにおける判定用ＵＶ−Ｃの強度を表しており、Ｓ_４＿Ｒ（λ）は、単位強度を有する波長λの光により励起されて参照用の偽造防止媒体１０の発光部１２から発光される光のスペクトルを表している。 Note that by 100 divides the scope or range of the optical wavelength 200~280nm optical wavelength 315 to 400 nm, the wavelength λ ₁ _1~λ ₁ _100 or wavelength λ ₂ _1~λ ₂ _100 is an example obtained, It is not limited to this. The range and resolution (number of divisions) assigned to each wavelength are appropriately set according to the accuracy required for authenticity determination. For example, when the number of divisions is infinite, the above [Equation 9] is expressed as follows.

In [Equation 10], I ₁ —M (λ) represents the intensity of the UV-A for determination at wavelength λ, and S ₃ —R (λ) is excited by light of wavelength λ having unit intensity. The spectrum of the light emitted from the light emitting portion 12 of the reference forgery prevention medium 10 is shown. Similarly, I ₂ _M (λ) represents the intensity of the determination UV-C at the wavelength λ, and S ₄ _R (λ) is excited by the light of the wavelength λ having the unit intensity and is forged for reference. The spectrum of the light emitted from the light emitting unit 12 of the prevention medium 10 is shown.

(Calculation process)
Next, the corrected spectrum S ′ ₃ —R of the first reference emission light calculated as described above by the calculation unit 38 and the spectrum S ₃ —M of the first emission light measured using the spectrum analyzer 27 are calculated. The correlation coefficient R_I ₃ between is calculated. Further, the phase relationship between the corrected spectrum S ′ ₄ _R of the second reference emission light calculated as described above and the spectrum S ₄ _M of the second emission light measured using the spectrum analyzer 27. The number R_I ₄ is calculated. Since the calculation process is substantially the same as the calculation process in the third embodiment described above, detailed description thereof is omitted.

(Judgment process)
Next, based on the calculated correlation coefficient R_I ₃ and correlation coefficient R_I ₄ , the determination unit 37 determines whether or not the forgery prevention medium 10 is genuine. Since the determination step is substantially the same as the determination step in the third embodiment described above, detailed description thereof is omitted.

Thus, according to the present embodiment, the corrected spectrum S ′ ₃ _R of the first reference emission light is calculated in consideration of the spectrum shape of the determination UV-A. Further, the corrected spectrum S ′ ₄ _R of the second reference emission light is calculated in consideration of the shape of the spectrum of the determination UV-C. For this reason, it becomes possible to carry out the authenticity determination for the forgery prevention medium 10 with higher accuracy.

First Modification In the present embodiment, an example in which the authenticity determination of the forgery prevention medium 10 is performed based on the correlation coefficient calculated by the calculation unit 38 is shown. However, the present invention is not limited to this, and the intensity obtained by integrating the spectrum S ′ ₃ _R is compared with the intensity obtained by integrating the spectrum S ₃ _M, as in the first case described above. By doing so, the authenticity determination of the forgery prevention medium 10 may be performed. Similarly, the authenticity determination of the forgery prevention medium 10 may be performed by comparing the intensity obtained by integrating the spectrum S ′ ₄ —R with the intensity obtained by integrating the spectrum S ₄ —M. . Further, as in the case of the first modification of the first embodiment described above, the authenticity determination of the forgery prevention medium 10 may be performed based on the intensity ratio.

In the second modified example and the present embodiment, first, UV-A for determination from the first light source 21 is irradiated to the light emitting unit 12 of the forgery prevention medium 10 to be determined (first irradiation step), and then An example is shown in which the determination UV-C from the second light source 22 is irradiated to the light emitting unit 12 of the forgery prevention medium 10 to be determined (second irradiation step). However, the present invention is not limited to this, and the determination UV-A from the first light source 21 and the determination from the second light source 22 are the same as in the case of the second modification of the first embodiment described above. UV-C may be simultaneously irradiated on the light emitting unit 12 of the forgery prevention medium 10 to be determined. In this case, the spectrum analyzer 27 obtains intensities at a plurality of wavelengths with respect to a spectrum S _OUT —M (see FIG. 6) obtained by adding the spectrum S ₃ —M of the first emission light and the spectrum S ₄ —M of the second emission light. . Further, based on the intensity at each wavelength of the determination UV-A and the determination UV-C, the reference S to be compared with the spectrum S _OUT _M by the method shown in the above [Equation 9] or [Equation 10] Is calculated. And the authenticity determination of the forgery prevention medium 10 is performed by comparing the calculated reference spectrum with the spectrum S _OUT —M.

Other Modifications In the above embodiments, the light irradiation unit 20 changes the first irradiation intensity I ₁ —M and the second irradiation intensity I ₂ —M while changing the light emitting unit 12 of the forgery prevention medium 10 to be determined. On the other hand, UV-A for determination and UV-C for determination may be irradiated a plurality of times. In this case, the measurement unit 25 irradiates the light irradiation unit 20 with the intensity I ₃ —M of the first emission light and the intensity I ₄ —M of the second emission light emitted from the light emitting unit 12 of the forgery prevention medium 10 to be determined. Find each time. In addition, the authenticity determination unit 35 includes a first irradiation intensity I ₁ —M and a second irradiation intensity I ₂ —M, and a first reference irradiation intensity in the database 30 for each of a plurality of irradiations by the light irradiation unit 20. Considering the difference between the I ₁ —R and the second reference irradiation intensity I ₂ —R, the authenticity determination of the forgery prevention medium 10 is performed. As a result, the authenticity determination can be performed with higher accuracy than the case where the authenticity determination of the forgery prevention medium 10 is performed based on the single irradiation of the determination UV-A and the determination UV-C. In this case, in the authenticity determination by the authenticity determination unit 35, the light wavelengths of the first emission light and the second emission light may be further taken into account, as in the case of the second mode, and the above-described third As in the case of the embodiment, the correlation coefficient may be calculated.

  In each of the above embodiments, the phosphor contained in the light emitting portion 12 of the anti-counterfeit medium 10 is excited by ultraviolet light (UV-C) having a wavelength of 254 nm to emit green light, and ultraviolet light having a wavelength of 365 nm (UV-A). The example in which the phosphor DE-GB which emits blue light when excited by the above is used is shown. However, the present invention is not limited to this, and the phosphor of the light emitting unit 12 is excited by ultraviolet light (UV-C) having a wavelength of 254 nm to emit red light and excited by ultraviolet light having a wavelength of 365 nm (UV-A). Various dichroic phosphors such as phosphor DE-RB (manufactured by Nemoto Special Chemical) that emits blue light can be used.

  Further, in each of the above embodiments, examples have been shown in which phosphors having excitation characteristics with respect to UV-A or UV-C are used as the phosphors included in the light emitting unit 12 of the anti-counterfeit medium 10. However, the present invention is not limited to this, and a phosphor having excitation characteristics with respect to UV-B or infrared rays may be used as the phosphor included in the light emitting unit 12 of the forgery prevention medium 10. That is, invisible light in an arbitrary wavelength region can be used as “invisible light in the first wavelength region” or “invisible light in the second wavelength region” in the present invention.

  Moreover, in each said embodiment, the base material 11 of the forgery prevention medium 10 showed the example which consists of a polyethylene terephthalate. However, it is not restricted to this, The base material 11 can be comprised from various materials, such as a polyvinyl chloride, a polycarbonate, a polypropylene, a polystyrene. Further, a paper base made of a paper material may be used as the base 11.

DESCRIPTION OF SYMBOLS 10 Anti-counterfeit medium 11 Base material 12 Light emission part 13 Fluorescent ink 20 Light irradiation part 21 1st light source 22 2nd light source 25 Measurement part 26 Power meter 27 Spectrum analyzer 30 Database 35 Authenticity determination part 36 Intensity correction part 36A Spectrum correction part 37 Judgment unit 38 Calculation unit 50 Authenticity judgment system

Claims (6)

In a true / false judgment system that performs true / false judgment on a luminescent medium,
The light emitting medium emits light of the first color when irradiated with the first invisible light in the first wavelength region, and emits light of the second color when irradiated with the second invisible light in the second wavelength region. Having a light emitting part including a phosphor that emits light;
The true / false judgment system
A first light source that irradiates the light emitting part of the light emitting medium to be determined with a first irradiation intensity, and a second invisible light that irradiates the light emitting part of the light emitting medium to be determined with a second irradiation intensity. A light source including a second light source,
A first emission light that is excited by the first invisible light having the first irradiation intensity and emits light from a light emitting unit of the light emitting medium to be determined, and a light emitting medium to be determined that is excited by the second invisible light having the second irradiation intensity. A measurement unit that receives the second emission light emitted from the light emission unit and obtains the intensity of the first emission light and the intensity of the second emission light,
Excited by the first reference irradiation intensity of the first invisible light and the second reference irradiation intensity of the second invisible light, and the first invisible light of the first reference irradiation intensity irradiated to the light emitting portion of the reference light emitting medium. The second reference light emitted from the light emitting part of the reference light emitting medium when excited by the second invisible light having the second reference irradiation intensity and the intensity of the first reference emission light emitted from the light emitting part of the reference light emitting medium. A database in which information on the intensity of the reference emission light and information on each is pre-stored,
In consideration of the difference between the first irradiation intensity and the second irradiation intensity and the first reference irradiation intensity and the second reference irradiation intensity, the intensity of the first reference emission light and the intensity of the second reference emission light And then comparing the intensity of the first emitted light with the corrected intensity of the first reference emitted light, and the intensity of the second emitted light and the corrected intensity of the second reference emitted light. A true / false determination unit that performs a true / false determination of a determination target light emitting medium ,
The first irradiation intensity of the first invisible light and the second irradiation intensity of the second invisible light irradiated from the light irradiation section to the light emitting section of the light emitting medium to be determined can be adjusted.
The light irradiating unit irradiates the light emitting unit of the light emitting medium to be determined with the first invisible light and the second invisible light a plurality of times while changing the first irradiation intensity and the second irradiation intensity.
The measurement unit obtains the intensity of the first emission light and the intensity of the second emission light each time irradiation is performed by the light irradiation unit,
The true / false determination unit determines a difference between the first irradiation intensity, the second irradiation intensity, the first reference irradiation intensity, and the second reference irradiation intensity for each of a plurality of irradiations by the light irradiation unit. In consideration, the intensity of the first reference emission light and the intensity of the second reference emission light are corrected, and then between the intensity of the first emission light and the corrected intensity of the first reference emission light. A correlation coefficient is calculated, and a correlation coefficient between the intensity of the second emission light and the corrected intensity of the second reference emission light is calculated, and the correlation coefficients are 0.8 to 1 respectively. A true / false determination system that determines that a light-emitting medium to be determined is a regular one when it is within a range of 0.0 . The measurement unit further determines a light wavelength of the first emission light and a light wavelength of the second emission light,
The database further includes information on the light wavelength of the first reference emission light and the light wavelength of the second reference emission light,
The authenticity determination unit takes into account the difference between the first irradiation intensity and the second irradiation intensity and the first reference irradiation intensity and the second reference irradiation intensity, and the intensity of the first reference emission light and the Correcting the intensity of the second reference emission light, then comparing the intensity and light wavelength of the first emission light with the corrected intensity and light wavelength of the first reference emission light, and The authenticity determination of claim 1, wherein the authenticity determination of the light-emitting medium to be determined is performed by comparing the intensity and optical wavelength with the corrected intensity and optical wavelength of the second reference emission light. system. The measurement unit obtains the intensity of the first emission light and the intensity of the second emission light at a plurality of light wavelengths,
The database further comprises information on the intensity of the first reference emission light and the intensity of the second reference emission light at a plurality of light wavelengths,
The authenticity determination unit takes into account the difference between the first irradiation intensity and the second irradiation intensity and the first reference irradiation intensity and the second reference irradiation intensity, and the first reference emission at a plurality of light wavelengths. Correcting the intensity of the light and the intensity of the second reference emission light, then comparing the intensity of the first emission light at a plurality of light wavelengths with the corrected intensity of the first reference emission light, and a plurality of The authenticity determination of the light emitting medium to be determined is performed by comparing the intensity of the second emitted light at the light wavelength and the corrected intensity of the second reference emitted light. Authenticity determination system. In the authenticity determination method for performing authenticity determination on the luminescent medium,
The light emitting medium emits light of the first color when irradiated with the first invisible light in the first wavelength region, and emits light of the second color when irradiated with the second invisible light in the second wavelength region. Having a light emitting part including a phosphor that emits light;
The authenticity judgment method is
Excited by the first reference irradiation intensity of the first invisible light and the second reference irradiation intensity of the second invisible light, and the first invisible light of the first reference irradiation intensity irradiated to the light emitting portion of the reference light emitting medium. The second reference light emitted from the light emitting part of the reference light emitting medium when excited by the second invisible light having the second reference irradiation intensity and the intensity of the first reference emission light emitted from the light emitting part of the reference light emitting medium. A step of preparing a database in which information relating to the intensity of the reference emission light is stored in advance; a first irradiation step of irradiating the light emitting part of the light emitting medium to be determined with a first irradiation intensity with a first irradiation intensity; ,
A second irradiation step of irradiating the light emitting part of the light emitting medium to be determined with a second irradiation intensity with the second invisible light;
A first emission light that is excited by the first invisible light having the first irradiation intensity and emits light from a light emitting unit of the light emitting medium to be determined, and a light emitting medium to be determined that is excited by the second invisible light having the second irradiation intensity. A measuring step of receiving the second emission light emitted from the light emitting unit and determining the intensity of the first emission light and the intensity of the second emission light, respectively;
In consideration of the difference between the first irradiation intensity and the second irradiation intensity and the first reference irradiation intensity and the second reference irradiation intensity, the intensity of the first reference emission light and the intensity of the second reference emission light And then comparing the intensity of the first emitted light with the corrected intensity of the first reference emitted light, and the intensity of the second emitted light and the corrected intensity of the second reference emitted light. by comparing the, and a false determination step for authenticity determination of the determination target of the luminescent medium,
The first irradiation intensity of the first invisible light in the first irradiation step and the second irradiation intensity of the second invisible light in the second irradiation step can be adjusted,
In the first irradiation step and the second irradiation step, the first invisible light and the second invisible light are emitted to the light emitting part of the light emitting medium to be determined while changing the first irradiation intensity and the second irradiation intensity. Irradiated several times,
In the measurement step, the intensity of the first emission light and the intensity of the second emission light are respectively obtained for each irradiation of the first invisible light and the second invisible light in the first irradiation step and the second irradiation step. And
In the authenticity determination step, the first irradiation intensity and the second irradiation intensity for each of a plurality of irradiations of the first invisible light and the second invisible light in the first irradiation step and the second irradiation step. In consideration of the difference between the first reference irradiation intensity and the second reference irradiation intensity, the intensity of the first reference emission light and the intensity of the second reference emission light are corrected, and then the first emission light A correlation coefficient between the intensity of the first emission light and the corrected intensity of the first reference emission light, and between the intensity of the second emission light and the intensity of the second reference emission light after correction. A correlation coefficient is calculated, and when each of the correlation coefficients is within a range of 0.8 to 1.0, it is determined that the light emitting medium to be determined is a regular one. Authenticity determination method characterized by In the measurement step, a light wavelength of the first emission light and a light wavelength of the second emission light are further obtained,
The database further includes information on the light wavelength of the first reference emission light and the light wavelength of the second reference emission light,
In the authenticity determination step, considering the difference between the first irradiation intensity and the second irradiation intensity and the first reference irradiation intensity and the second reference irradiation intensity, Correcting the intensity of the second reference emission light, then comparing the intensity and light wavelength of the first emission light with the corrected intensity and light wavelength of the first reference emission light, and by comparing the intensity and wavelength of light after correction of the intensity and the light wavelength and the second reference emission light, authenticity of claim 4, wherein the authenticity determination of the determination target of the light emitting medium is performed Judgment method. In the measurement step, the intensity of the first emission light and the intensity of the second emission light at a plurality of light wavelengths are respectively determined.
The database further comprises information on the intensity of the first reference emission light and the intensity of the second reference emission light at a plurality of light wavelengths,
In the authenticity determination step, the first reference emission at a plurality of light wavelengths in consideration of the difference between the first irradiation intensity and the second irradiation intensity and the first reference irradiation intensity and the second reference irradiation intensity. Correcting the intensity of the light and the intensity of the second reference emission light, then comparing the intensity of the first emission light at a plurality of light wavelengths with the corrected intensity of the first reference emission light, and a plurality of by comparing the intensity of the corrected between the intensity of the second emission light in the optical wavelength and the second reference emission light, according to claim 4, characterized in that the authenticity determination of the determination target of the light emitting medium is performed Authenticity judgment method.

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