WO2015133056A1 - セキュリティマーク、及びその認証方法、認証装置及び製造方法、並びにセキュリティマーク用インク及びその製造方法 - Google Patents
セキュリティマーク、及びその認証方法、認証装置及び製造方法、並びにセキュリティマーク用インク及びその製造方法 Download PDFInfo
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- WO2015133056A1 WO2015133056A1 PCT/JP2015/000371 JP2015000371W WO2015133056A1 WO 2015133056 A1 WO2015133056 A1 WO 2015133056A1 JP 2015000371 W JP2015000371 W JP 2015000371W WO 2015133056 A1 WO2015133056 A1 WO 2015133056A1
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- Prior art keywords
- security
- security mark
- photochromic
- information
- mark
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/378—Special inks
- B42D25/387—Special inks absorbing or reflecting ultraviolet light
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/378—Special inks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/378—Special inks
- B42D25/382—Special inks absorbing or reflecting infrared light
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/50—Sympathetic, colour changing or similar inks
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K9/00—Tenebrescent materials, i.e. materials for which the range of wavelengths for energy absorption is changed as a result of excitation by some form of energy
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
- G07D7/1205—Testing spectral properties
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K9/00—Tenebrescent materials, i.e. materials for which the range of wavelengths for energy absorption is changed as a result of excitation by some form of energy
- C09K9/02—Organic tenebrescent materials
Definitions
- the present invention relates to a security mark, an authentication method thereof, an authentication device and a manufacturing method, and an ink for a security mark and a manufacturing method thereof. More specifically, the present invention relates to a security mark authentication method using a photochromic compound.
- Photochromic compounds exhibiting photochromism diarylethene (Patent Literature 1), spiropyran (Patent Literature 2), hexaarylbiimidazole (Non Patent Literature 1) and azobenzene (Non Patent Literature 2) compounds are known.
- Photochromism is also referred to as “photochromism”, “photochromy”, and “photochromism”, and a certain substance is in a solid or solution state at a specific wavelength.
- Patent Document 3 Since photochromic compounds exhibit reversible coloring when irradiated with light, research aimed at application to light-modulating materials (Patent Document 3) and optical recording materials (Patent Documents 4 and 5) has been conducted.
- Patent Document 6 describes an ink using a photo-romic compound. This ink has light resistance, and it is said that the color density does not decrease even when light is irradiated for a long time.
- Patent Document 7 by the present inventors discloses a security ink using a photolomic compound.
- this security ink is irradiated with ultraviolet light or the like to a security ink layer formed by painting or printing, the photochromic compound is colored, and security marks such as characters or figures painted or printed can be visually recognized.
- security marks such as characters or figures painted or printed can be visually recognized.
- Patent Document 7 does not describe blending two or more compounds having different photochromic characteristics into security ink.
- the main object of the present invention is to provide a technique capable of achieving higher security performance in a security mark authentication method using a photo-romic compound.
- the present inventors focused on the fact that the change in the absorption spectrum or reflection spectrum of the photochromic compound in the process of photochromic reaction (photoreversible discoloration) is unique to the structure of each compound, and the absorption spectrum of the photochromic compound over time.
- the change as information for security authentication, and further composing the information by combining a plurality of compounds having different photochromic characteristics, an authentication technology with high security was completed. That is, the present invention provides the following security mark authentication method and the like.
- a method for authenticating a security mark which relates to a process for irradiating a security mark comprising a photochromic compound with excitation light, and a change over time in an absorption spectrum and / or a reflection spectrum by the security mark after irradiation with the excitation light. And a process for obtaining a piece of security information.
- the authentication method according to [1] further including a process of comparing the acquired first security information with the first security information acquired in advance for the security mark.
- the authentication method according to [2] wherein the acquired first security information is calibrated with the temperature at the time of acquisition, and the security mark is compared with the first security information acquired in advance.
- the security mark further includes a fluorescent material, and a process for obtaining second security information relating to a spectrum of fluorescence emitted from the security mark, the obtained second security information, and the security mark
- the authentication method according to any one of [1] to [7], further including a process of collating with second security information acquired in advance for.
- An excitation light source for irradiating the security mark with excitation light including ultraviolet light and / or light having a wavelength of 400 to 600 nm, a measurement light source for irradiating the security mark with visible light and / or near infrared light, A photodetector that detects the transmitted light or reflected light of the visible light and / or near-infrared light by the security mark, and absorption of the signal output from the photodetector by the security mark after irradiation with excitation light
- a security mark authentication apparatus comprising: an analysis unit that stores the first security information relating to a temporal change in a spectrum and / or a reflection spectrum.
- the display unit further includes a display unit, wherein the analysis unit holds first security information acquired in advance for the security mark, and acquires the acquired first security information and the stored first security information.
- the analysis unit holds calibration information that defines the relationship between the decoloring speed of the photochromic compound and temperature, and calibrates the acquired first security information based on the temperature at the time of acquisition based on the calibration information. Then, the authentication device according to [12], wherein the verification is performed with the stored first security information.
- a security mark ink comprising two or more photochromic compounds having different photochromic properties.
- the security mark ink according to [16] further including a compound that decolorizes after 10 seconds or more after coloring by a photochromic reaction as the photochromic compound.
- a method for producing a security mark ink comprising a step of mixing two or more photochromic compounds having different photochromic properties.
- a security mark comprising two or more photochromic compounds having different photochromic properties.
- a method for producing a security mark comprising a step of mixing two or more photochromic compounds having different photochromic properties.
- a compound that decolorizes after 10 seconds or more after coloring by a photochromic reaction is further used as the photochromic compound.
- An authentication method for an article which includes a step of attaching a security mark including two or more photochromic compounds having different coloring and / or decoloring speeds after coloring to an authentication object.
- a method for authenticating an article wherein an excitation light is irradiated to a security mark that includes two or more photochromic compounds that are attached to an authentication object and have different coloring and / or decoloring speeds after coloring. And a procedure for obtaining first security information relating to a time-dependent change in an absorption spectrum and / or a reflection spectrum by the security mark after irradiation with excitation light.
- a method for authenticating an article comprising an absorption spectrum by a security mark comprising two or more photochromic compounds having different coloring and / or decoloring speeds after coloring applied to an authentication object, and / or Or the authentication method including the procedure which collates the 1st security information regarding a time-dependent change of a reflection spectrum, and reference
- the authentication object is a securities, banknote, credit card, cash card, passport, identification document, driver's license, stamp, tax stamp, boarding ticket, admission ticket, consumer goods or packaging thereof.
- the authentication method according to any one of [33].
- the “security mark” is information that can be optically detected by the authentication method according to the present invention, and includes information (security information) that enables the security mark to be distinguished from other security marks. It is a waste.
- the “security mark” broadly includes characters, symbols, figures, and combinations thereof including photochromic compounds.
- the “article” can be an “authentication object” of the authentication method according to the present invention with the security mark.
- “Goods” include securities, banknotes (banknotes), credit cards, cash cards, passports, identification documents, driver's licenses, stamps, tax stamps, boarding tickets, admission tickets, consumer goods and their packaging. Widely included.
- the security mark includes one authentication object or a group of authentication objects with the security mark and one other authentication object or another group of authentication objects with another security mark. Information that can be distinguished (security information) is included.
- FIG. It is a block diagram explaining the structure of the authentication apparatus of the security mark which concerns on this invention. It is a schematic diagram explaining the structure of the measurement part of the authentication apparatus of the security mark which concerns on this invention.
- the security mark authentication method includes the following processes. (1) A process of irradiating a security mark comprising a photochromic compound with excitation light (irradiation process). (2) A process (first information acquisition process) for acquiring first security information related to a change with time of an absorption spectrum and / or a reflection spectrum by a security mark after irradiation with excitation light. (3) A process of collating the acquired first security information with the first security information acquired in advance for the security mark (first verification process).
- the security mark authentication method may include the following processes. (4) A process of acquiring second security information related to the spectrum of fluorescence emitted from the security mark (second information acquisition process). (5) A process of collating the acquired second security information with the second security information acquired in advance for the security mark (second verification process).
- the “first security information” is information relating to the temporal change of the absorption spectrum and / or reflection spectrum of the security mark comprising the photochromic compound, and the absorption wavelength (or reflection wavelength) of the photochromic compound and And / or information on the intensity and time information. Furthermore, the “first security information” may include information regarding the temperature at the time of acquisition.
- a photochromic compound undergoes structural change (isomerization) without changing the molecular weight by irradiation with excitation light, and changes its absorption spectrum.
- FIG. 1 an example of the absorption spectrum change of the photochromic compound in the decolored state before excitation light irradiation and the coloring state after excitation light irradiation is shown. Before the excitation light irradiation, the absorption spectrum of the photochromic compound has no absorption in the visible light and / or near infrared light region, and the photochromic compound is colorless (the absorption spectrum before “excitation light irradiation” in the figure).
- the photochromic compound When the excitation light is irradiated, the photochromic compound is colored, and absorption occurs in the visible light and / or near infrared light region in the absorption spectrum (an absorption spectrum after “excitation light irradiation” in the figure). When the irradiation of the excitation light is stopped, the photochromic compound is decolored and the absorption spectrum returns to the state before the irradiation with the excitation light. Thus, the absorption spectrum of a photochromic compound reversibly changes between two different absorption spectra with a photochromic reaction.
- FIG. 2 shows an example of the change with time of the absorbance at a specific wavelength of the photochromic compound before the excitation light irradiation and after the excitation light stop.
- Absorbance of a specific wavelength (in this case, any three wavelengths) in the visible light and / or near-infrared light region increases instantaneously by generating a colored body by irradiation with excitation light (0 seconds in the figure). To do. When the irradiation of the excitation light is stopped, the colored body returns to the decolored body, and the absorbance gradually decreases.
- the security mark authentication method is information relating to the time-dependent change of the absorption spectrum and / or reflection spectrum of such a photochromic compound, and includes information including the wavelength and / or its intensity and time as “first”.
- Security information ".
- the absorption light of the photochromic compound changes, the transmitted light which is a complementary color thereof also changes in correlation.
- the “absorption spectrum” and the “transmission spectrum” of the security mark are treated as the same unless otherwise specified.
- the “absorption spectrum” of the photochromic compound changes the “reflection spectrum” also changes in correlation with it.
- the “first security information” of the present invention includes the absorption spectrum (or transmission spectrum) of the security mark. Not only information related to the change with time but also information related to the change with time of the reflection spectrum of the security mark is included.
- the authentication object to which the security mark is attached does not have optical transparency, it is preferable to use information relating to the reflection spectrum of the security mark as the first security information.
- the photochromic compound there are various compounds having different photochromic characteristics, that is, coloring by a photochromic reaction and / or decoloring speed after coloring. Moreover, it is possible to design photochromic compounds exhibiting various coloring and decoloring speeds by modifying the structure of existing compounds.
- the first security information is information unique to the photochromic compound included in the security mark, and changes variously depending on the photochromic characteristics of the compound. Therefore, this security information can be used for security authentication. Can be realized.
- the security mark contains a combination of two or more photochromic compounds having different coloring and / or decoloring speeds after coloring by the photochromic reaction, so that the absorption spectrum and / or the reflection spectrum after irradiation with excitation light are changed over time ( It is possible to create almost infinite patterns of the first security information.
- the photochromic compound is described as a compound that is colored by irradiation with excitation light.
- the photochromic compound exhibits so-called “reverse photochromism” and is erased by irradiation with excitation light.
- Compounds that color are also included. That is, when the excitation light is irradiated, the absorption in the visible light and / or near infrared light region of the absorption spectrum disappears and disappears, and when the irradiation of the excitation light is stopped, the absorption spectrum returns to the original state and is colored.
- Information regarding the change over time of the absorption spectrum of such a reverse photochromic compound can also be used as “first security information”.
- the “second security information” means information on the spectrum of fluorescence emitted from a security mark including a photochromic compound and a fluorescent substance.
- the security can be further enhanced by using the second security information and the first security information in combination for authentication.
- the excitation light is irradiated to the security mark including the photochromic compound.
- the excitation light includes ultraviolet light and / or light having a wavelength of 400 to 600 nm.
- the security mark authentication method according to the present invention may include a process of manufacturing a security mark as a pre-procedure of the irradiation process. The manufacturing process will be described later in detail in the section of the method for manufacturing the security mark ink and the method for manufacturing the security mark according to the present invention.
- the irradiation time of the excitation light to the security mark is not particularly limited as long as it is necessary for coloring the photochromic compound, and is, for example, about 10 to 200 milliseconds.
- the color is erased by irradiation with excitation light.
- the photochromic compound will be described as an example.
- First information acquisition process In the first information acquisition process, first security information related to the time-dependent change of the absorption spectrum and / or reflection spectrum by the security mark after irradiation with excitation light is acquired.
- the first security information is obtained by irradiating the security mark after the excitation light irradiation with visible light and / or near infrared light, and transmitting or reflecting the visible light and / or near infrared light with a detector. This is done by detecting over time.
- the visible light may be white light.
- the irradiation time of visible light and / or near-infrared light to the security mark is appropriately set according to the decoloring time of the photochromic compound, and is not particularly limited, but is, for example, about 0.1 to 10 seconds.
- the acquisition of the first security information may be started simultaneously with the irradiation of the excitation light. In this case, visible light and / or near infrared light is irradiated onto the security mark simultaneously with the excitation light.
- the acquisition of the first security information is preferably performed by using a time-resolved absorption spectrum and / or reflection spectrum measurement device, for example, the pulsed light of an ultraviolet LED (365 nm) as an excitation light source and the white LED as a visible light source and / or Alternatively, the near-infrared light LED can be used as a near-infrared light source to measure the absorption wavelength (or reflection wavelength) and / or the absorption intensity of the colored body of the photochromic compound over time. Further, as a simpler measuring apparatus, a security mark authenticating apparatus according to the present invention described later can be used.
- a time-resolved absorption spectrum and / or reflection spectrum measurement device for example, the pulsed light of an ultraviolet LED (365 nm) as an excitation light source and the white LED as a visible light source and / or Alternatively, the near-infrared light LED can be used as a near-infrared light source to measure the absorption wavelength (or reflection wavelength) and / or
- FIG. 3 and 4 illustrate the first security information acquired.
- FIG. 3 is a two-dimensional display of the absorption spectrum with the vertical axis representing the absorption wavelength and the horizontal axis representing time.
- FIG. 4 shows the absorption spectrum at each data acquisition time with the vertical axis representing absorbance and the horizontal axis representing absorption wavelength.
- 3 and 4 show the first security information acquired with a security mark including three photochromic compounds A, B, and C having different photochromic characteristics.
- FIG. 5 shows the time-dependent change of the absorption spectrum in the quenching process of the colored body produced after the photochromic compounds A, B, and C are irradiated with excitation light.
- the vertical axis represents absorbance
- the horizontal axis represents absorption wavelength.
- the photochromic compound A absorbs from the visible light region to the near infrared light region, and particularly strongly absorbs near 780 nm.
- Photochromic compound B absorbs near 470 nm
- photochromic compound C absorbs near 550 nm.
- the half-life of the colored product at room temperature is about 30 milliseconds for Compound A, about 100 milliseconds for Compound B, and about 1 second for Compound C.
- the first security information acquired by the security mark includes characteristic changes in the vicinity of wavelengths 470 nm, 550 nm, and 780 nm due to changes in absorption spectra of the photochromic compounds A, B, and C (FIGS. 4 and 4). 5).
- FIG. 6 shows the first security information acquired by this security mark by extracting the time-dependent change in absorbance around wavelengths of 480 nm, 600 nm, and 780 nm.
- the vertical axis represents absorbance
- the horizontal axis represents time.
- the acquisition of the first security information in the first information acquisition process may be performed by spectrum measurement of the entire visible light and / or near-infrared light, thereby increasing the processing speed. Therefore, as shown in FIG. 6, it may be performed by measuring only a specific wavelength (preferably a plurality of wavelengths).
- first verification process In the first verification process, verification is performed between the first security information acquired in the first information acquisition process and the first security information acquired in advance for the security mark.
- first security information (hereinafter also referred to as “reference information”) is obtained in advance for a security mark including a specific photochromic compound. Then, the first security information acquired in the first information acquisition process (hereinafter also referred to as “inquiry information”) is compared with the reference information for the security mark to be authenticated, and security authentication is performed based on the match / mismatch.
- the reference information is not limited to information measured in advance, and known information may be used.
- the reference information and the inquiry information can be collated by comparing the wavelength / time-two-dimensional absorption spectrum or the absorption spectrum including the absorption wavelength, time and absorbance information as shown in FIGS.
- the comparison may be performed for the wavelength / time-two-dimensional absorption spectrum or the entire absorption spectrum, or may be performed by selecting and extracting a part of the feature amount.
- comparison of the whole spectrum can be performed by analysis using a fitting curve by a known least square method.
- the comparison of the feature amounts may be the slope of the absorbance decay curve, the peak ratio of absorbance at a plurality of wavelengths in a colored state, or the like.
- peak intensity ratios in the vicinity of wavelengths 470 nm, 550 nm, and 780 nm appearing due to the photochromic characteristics of the photochromic compounds A, B, and C can be adopted as feature amounts. .
- the following conditions 1 to 4 are set based on the reference information acquired in advance for the security marks including the photochromic compounds A, B, and C. Then, it is determined that the reference information matches the inquiry information when the inquiry information satisfies all of the conditions 1 to 4, and it is determined that the reference information does not match when any one of the conditions is not satisfied.
- Condition 1 An absorption spectrum corresponding to the colored state of compounds A, B, and C is detected during excitation light irradiation.
- Condition 2 Absorption near 780 nm exists immediately after excitation light irradiation until 0.1 seconds after irradiation (see FIG. 4).
- Condition 3 An absorption peak at 0.2 seconds after excitation light irradiation is in the vicinity of 470 nm.
- Condition 4 An absorption peak at 0.5 seconds after excitation light irradiation is in the vicinity of 550 nm. Note that due to the photochromic reaction, the compound A absorbs near 780 nm, the compound B absorbs near 470 nm, and the photochromic compound C absorbs near 550 nm.
- the decoloring speed of compounds A, B, and C is fast in the order of A, B, and C, and the half-life at room temperature is about 30 milliseconds for compound A, about 100 milliseconds for compound B, and about 1 second for compound C.
- the decoloring speed of the photochromic compound varies depending on the temperature. For this reason, in this process, it is desirable to calibrate the inquiry information according to the temperature at the time of acquisition, and to collate it with the reference information. Calibration by temperature can be performed by a general method using a calibration curve that defines the relationship between temperature and decoloring speed. A calibration curve obtained in advance or a known curve may be used.
- the reflection spectrum of the security mark when used as the first security information, the spectrum of the light source for the reflection spectrum needs to be known. Therefore, in this process, information on the spectrum of the light source for the reflection spectrum may be referred to in order to check the reference information and the reference information.
- the security performance is further enhanced by using the information of the spectrum of the light source for reflection spectrum as information for authentication.
- the security mark may contain a fluorescent substance in addition to the photochromic compound.
- second security information related to the spectrum of fluorescence emitted from the security mark is acquired.
- a second information acquisition process is executed.
- a fluorescent substance is not specifically limited, A conventionally well-known compound is employable.
- the acquisition of the second security information is performed by detecting the fluorescence emitted from the security mark by the irradiation of excitation light with a detector.
- the excitation light for exciting the fluorescent substance may be the same as or different from the excitation light for exciting the photochromic compound.
- the excitation light of the fluorescent material is preferably ultraviolet light.
- the acquired second security information is compared with the second security information acquired in advance for the security mark.
- second security information (hereinafter also referred to as “reference information (fluorescence)”) is obtained in advance for a security mark including a specific fluorescent substance. Then, the second security information (hereinafter also referred to as “inquiry information (fluorescence)” acquired in the second information acquisition process is compared with the reference information (fluorescence) for the security mark to be authenticated, and based on the mismatch , Perform security authentication.
- the reference information (fluorescence) is not limited to information measured in advance, and known information may be used.
- the authentication device 1 includes a measurement unit 2 and an analysis unit 3.
- the “irradiation process” and the “first information acquisition process” and optionally the “second information acquisition process” of the above-described security mark authentication method are executed.
- the analysis unit 3 executes the “first matching process” and optionally the “second matching process” of the same method.
- the measurement unit 2 includes an excitation light source 21 that irradiates the security mark M with excitation light including ultraviolet light and / or light having a wavelength of 400 to 600 nm, and measurement that irradiates the security mark M with visible light and / or near infrared light.
- Light source 22 see FIG. 8
- the measurement unit 2 includes a photodetector 23 that detects transmitted light or reflected light of visible light and / or near infrared light by the security mark M.
- Excitation light emitted from the excitation light source 21 and visible light and / or near-infrared light emitted from the measurement light source 22 are guided to two optical fibers of the three-branch optical fiber 24 and irradiated to the security mark M.
- the security mark M may be directly irradiated with excitation light and visible light and / or near infrared light without using an optical fiber.
- the irradiation time of the excitation light to the security mark M may be a time necessary for excitation of the photochromic compound, and is not particularly limited, but is, for example, about 10 to 200 milliseconds. Further, the irradiation time of the visible light and / or near-infrared light to the security mark M is appropriately set according to the quenching time of the photochromic compound, and is not particularly limited, but is, for example, about 0.1 to 10 seconds.
- Irradiation of the visible light and / or near-infrared light to the security mark M is started immediately after the excitation light irradiation and, if necessary, simultaneously with the excitation light irradiation.
- Visible light and / or near-infrared transmitted light or reflected light applied to the security mark M is collected by the remaining one optical fiber of the three-branch optical fiber 24 and detected by the photodetector 23.
- transmitted light or reflected light may be directly detected by a detector without using an optical fiber.
- the measurement light source 22 and the photodetector 23 are separately provided for the absorption spectrum and the reflection spectrum. Further, when the security mark M includes a fluorescent material, an excitation light source (not shown) and a photodetector (not shown) for detecting the fluorescence spectrum of the security mark M may be provided.
- An ultraviolet LED and a white LED can be used for the excitation light source 21 and the measurement light source 22, respectively.
- a photodiode array may be used in combination with a spectroscope, and when detecting only a specific wavelength, an inexpensive photodiode may be used in combination with a color filter.
- the measuring unit 2 may be configured by a known time-resolved absorption spectrum and / or reflection spectrum device.
- the analysis unit 3 includes a CPU 31, a memory 32, a hard disk 33, an input unit such as a mouse 34 and a keyboard 35, a display unit such as a display 36 and a printer 37, and the like.
- the analysis unit 3 can be configured by a general-purpose computer and a program.
- the transmitted light and / or reflected light and optionally fluorescence of the security mark M detected by the detection unit 2 are converted into electrical signals, and the first security information (verification information) and optionally the second security information (verification information). (Fluorescence)) is stored in the hard disk 33 of the analysis unit 3 (see reference numeral 331 in FIG. 7).
- the hard disk 33 also holds first security information (reference information) acquired in advance for the security mark M and second reference information (reference information (fluorescence)) acquired in advance (see reference numeral 332). Further, the hard disk 33 stores an OS 333 and a program 334 for collating the inquiry information 331 and the reference information 332.
- the analysis unit 3 collates the inquiry information 331 and the reference information 332 using the OS 333 and the program 334, and outputs the result to the display unit such as the display 36 and the printer 37.
- the collation of the inquiry information 331 and the reference information 332 can be performed in the same manner as described in the first collation process and the second collation process. Further, when calibration is performed based on the temperature of the inquiry information, the calibration information that defines the relationship between the temperature and the decoloring speed stored in the hard disk 33 is referred to. Further, when the reflection spectrum of the security mark M is used as the first security information, the spectrum of the light source for the reflection spectrum needs to be known, and the spectrum information of the light source is also stored in the hard disk 33.
- the security mark ink according to the present invention comprises two or more photochromic compounds having different photochromic characteristics, and more specifically, two or more photochromic compounds having different coloring and / or decoloring speed after coloring by a photochromic reaction. Comprising.
- Information relating to the time-dependent change of the absorption spectrum and / or reflection spectrum of the photochromic compound and including the wavelength and / or its intensity and time can be used as information with high security as described above. For this reason, the photochromic compound is useful for security mark ink.
- the absorption spectrum after excitation light irradiation and / or by combining two or more photochromic compounds having different coloring and / or decoloring speeds after coloring into the security mark ink It is possible to create an almost infinite pattern of the change in reflection spectrum over time.
- the number thereof is not particularly limited, but it is preferably about 2 to 20 types, more preferably considering the improvement in security and cost. Is about 3 to 10 kinds.
- the photochromic compounds used in the present invention include the diarylethene (Patent Document 1), spiropyran (Patent Document 2), hexaarylbiimidazole (Non Patent Document 1), and azobenzene (Non Patent Document 2) compounds. It may be a known compound.
- suitable photochromic compounds include compounds that require a shorter time for the photochromic reaction.
- a compound that rapidly undergoes photochromic reaction By using a compound that rapidly undergoes photochromic reaction, the measurement time of the absorption spectrum and / or reflection spectrum of the photochromic compound can be shortened, and the authentication process can be speeded up.
- a photochromic compound high-speed color-decoloring photochromic compound
- Patent Document 7 Japanese Patent No. 464376, Japanese Patent Application Laid-Open No. 2011-122089, Japanese Patent Application Laid-Open No. 2011-144289, which have been developed by the present inventors. Examples thereof include bisimidazole compounds described in JP2012-251097.
- These compounds are quickly decolored after the irradiation of excitation light is stopped, and the decoloring time is within several tens of nanoseconds to several seconds, preferably within 1 microsecond to 1 second, more preferably within 10 microseconds to 100 microseconds. It is.
- the ink for security mark according to the present invention may contain a compound having a considerably long decoloring time in addition to the compound having a short decoloring time as described above.
- a compound having a long decoloration time in the security mark ink, specifically, a compound that decolors after several seconds or more after coloring by a photochromic reaction, preferably after 10 seconds or more, the photochromic reaction of the ink Can be seen by humans, and appealing to the security of appearance.
- the change in the absorption spectrum and / or reflection spectrum due to the fast color-decoloring photochromic compound may be performed as the first security information, and in addition, the absorption spectrum and / or reflection due to the photochromic compound having a long extinction time.
- a change in spectrum may also be used for the first security information.
- the color change of the compound with a long decoloration time functions to hide the color change of the high-speed photochromic compound used for authentication at the same time as appealing the security of appearance. Increase confidentiality and improve security.
- the ink for security marks according to the present invention can be produced by dissolving or dispersing two or more photochromic compounds having different photochromic characteristics in a commonly used ink solvent.
- the solvent is not particularly limited, and examples thereof include benzene, toluene, chloroform, methylene chloride, methanol, 2-propanol, 2-methoxyethanol, acetone, methyl ethyl ketone, and mixed solvents thereof. Moreover, you may mix
- the solvent may contain a polymer compound such as a resin.
- the polymer compound is not particularly limited, but polymethyl methacrylate (PMMA), polystyrene, polyimide, polycarbonate, polyethylene, polyethylene terephthalate, polyvinyl chloride, polyvinylidene chloride, polylactic acid, polypropylene, polyamide, polycarbonate, polytetrafluoro. Examples thereof include ethylene, polyurethane, polyester, ABS resin, epoxy resin, polyacetal and the like. These polymer compounds can be used alone or in combination of two or more.
- the solvent containing the polymer compound is not limited to the polymer compound dissolved in the solvent, but may be a solvent in which a monomer capable of forming the polymer compound by a polymerization reaction or the like is dissolved.
- the security mark according to the present invention includes two or more photochromic compounds having different photochromic characteristics, and more specifically, includes two or more photochromic compounds having different coloring and / or decoloring speed after coloring by a photochromic reaction. It becomes.
- the security mark according to the present invention can be formed by painting or printing the security mark ink on an authentication object.
- the goods to be certified are not particularly limited, but are securities, banknotes (banknotes), credit cards, cash cards, passports, identification documents, driver's licenses, stamps, tax stamps, tickets, admission tickets, Consumer goods and their packaging.
- Securities include government bonds, municipal bonds, corporate bonds, investment securities, stock certificates, trust securities, and mortgage securities.
- Consumer goods include industrial products, agricultural and marine products, food and drinks, pharmaceuticals, etc.
- Industrial products include not only finished products but also parts used to assemble finished products (especially electronic components such as semiconductor elements). Shall be.
- the first security information and the second security information held by the security mark according to the present invention are the identity (authenticity) of the article, manufacturer, issuer, manufacturing place, issuing place, manufacturing date, issuing date, holding A user, a user, a distribution channel, a trading history, a usage history, and the like, and the security mark according to the present invention can be used to collate and authenticate such information.
- the authentication object when the authentication object has light transmittance, information on the absorption spectrum of the security mark and / or the temporal change of the transmission spectrum is used. It is preferable to use information relating to the change in the reflection spectrum with time.
- the object to be certified is painted by a painting method such as brush painting, spray painting, immersion painting, electrostatic painting, or roller painting.
- a painting method such as brush painting, spray painting, immersion painting, electrostatic painting, or roller painting.
- printing is performed on the authentication object by a printing method such as intaglio printing, relief printing, planographic printing, stencil printing, offset printing, and ink jet printing.
- the security mark may be a character, a figure, or the like, and when it is a figure, it may be a two-dimensional image such as a QR code (registered trademark). Painting, printing, or the like may be performed by changing the two-dimensional distribution of the type and concentration of the photochromic compound within the two-dimensional shape of the mark. Thereby, it is possible to construct authentication information with higher complexity and higher security by combining the position information in the mark and the first security information acquired at the position.
- QR code registered trademark
- the security mark can be attached to the opening of the object to be authenticated or its packaging so that the mark is broken by the opening operation, and can be used for unauthorized opening detection.
- the security mark is obtained by changing the two-dimensional distribution of the type and concentration of the photochromic compound in the two-dimensional shape as described above, the position information in the mark detected before and after the break of the mark and the position Since the first security information acquired in step 1 changes, the presence or absence of opening can be determined.
- the security mark authentication method using the photolomic compound according to the present invention includes securities, banknotes (banknotes), credit cards, cash cards, passports, identification documents, driver's licenses, stamps, tax stamps, and rides. It can be used to authenticate tickets, admission tickets, and consumer goods, and is useful for detecting and suppressing counterfeiting, unauthorized duplication, replacement, and misuse.
Abstract
Description
[2]取得された第一のセキュリティ情報と、前記セキュリティマークについて予め取得した第一のセキュリティ情報とを照合するプロセスをさらに含む、[1]の認証方法。
[3]取得された第一のセキュリティ情報を取得時の温度により校正して、前記セキュリティマークについて予め取得した第一のセキュリティ情報との照合を行う、[2]の認証方法。
[4]前記セキュリティマークが、フォトクロミック特性の異なる2以上のフォトクロミック化合物を含んでなる、[1]~[3]のいずれかの認証方法。
[5]前記セキュリティマークが、フォトクロミック反応による着色が異なるか、及び/又は、着色後の消色速度が異なる、2以上のフォトクロミック化合物を含んでなる、[4]の認証方法。
[6]前記フォトクロミック化合物として、フォトクロミック反応による着色後1秒以内に消色する化合物を用いる、[5]の認証方法。
[7]前記フォトクロミック化合物として、フォトクロミック反応による着色後10秒以上経過後に消色する化合物をさらに用いる、[6]の認証方法。
[8]前記セキュリティマークがさらに蛍光物質を含んでなり、前記セキュリティマークから放出される蛍光のスペクトルに関する第二のセキュリティ情報を取得するプロセスと、取得された第二のセキュリティ情報と、前記セキュリティマークについて予め取得した第二のセキュリティ情報とを照合するプロセスをさらに含む、[1]~[7]のいずれかの認証方法。
[9]前記励起光が、紫外光及び/又は波長400~600nmの光を含む、[1]~[8]のいずれかの認証方法。
[10]前記第一のセキュリティ情報を時間分解吸収スペクトル及び/又は反射スペクトル測定により取得する、[1]~[9]のいずれかの認証方法。
[12]表示部をさらに備え、前記解析部は、前記セキュリティマークについて予め取得した第一のセキュリティ情報を保持し、取得された第一のセキュリティ情報と、保持された第一のセキュリティ情報とを照合し結果を前記表示部に出力する、[11]の認証装置。
[13]前記解析部は、前記フォトクロミック化合物の消色速度と温度との関係を規定した校正情報を保持し、該校正情報に基づき、取得された第一のセキュリティ情報を取得時の温度により校正して、保持された第一のセキュリティ情報との照合を行う、[12]記載の認証装置。
[15]フォトクロミック反応による着色が異なるか、及び/又は、着色後の消色速度が異なる、2以上のフォトクロミック化合物を含んでなる、[14]のセキュリティマーク用インク。
[16]前記フォトクロミック化合物として、フォトクロミック反応による着色後1秒以内に消色する化合物を含む、[15]のセキュリティマーク用インク。
[17]前記フォトクロミック化合物として、フォトクロミック反応による着色後10秒以上後に消色する化合物をさらに含む、[16]のセキュリティマーク用インク。
[18]フォトクロミック特性の異なる2以上のフォトクロミック化合物を混合する工程を含む、セキュリティマーク用インクの製造方法。
[19]前記工程において、フォトクロミック反応による着色が異なるか、及び/又は、着色後の消色速度が異なる、2以上のフォトクロミック化合物を混合する、[18]の製造方法。
[20]前記フォトクロミック化合物として、フォトクロミック反応による着色後1秒以内に消色する化合物を用いる、[19]の製造方法。
[21]前記フォトクロミック化合物として、フォトクロミック反応による着色後10秒以上後に消色する化合物をさらに用いる、[20]の製造方法。
[23]フォトクロミック反応による着色が異なるか、及び/又は、着色後の消色速度が異なる、2以上のフォトクロミック化合物を含んでなる、[22]のセキュリティマーク。
[24]前記フォトクロミック化合物として、フォトクロミック反応による着色後1秒以内に消色する化合物を含む、[23]のセキュリティマーク。
[25]前記フォトクロミック化合物として、フォトクロミック反応による着色後10秒以上後に消色する化合物をさらに含む、[24]のセキュリティマーク。
[26][22]~[25]のいずれかのセキュリティマークが付された物品。[27]フォトクロミック特性の異なる2以上のフォトクロミック化合物を混合する工程を含む、セキュリティマークの製造方法。
[28]前記工程において、フォトクロミック反応による着色が異なるか、及び/又は、着色後の消色速度が異なる、2以上のフォトクロミック化合物を混合する、[27]の製造方法。
[29]前記フォトクロミック化合物として、フォトクロミック反応による着色後1秒以内に消色する化合物を用いる、[28]の製造方法。
[30]前記フォトクロミック化合物として、フォトクロミック反応による着色後10秒以上後に消色する化合物をさらに用いる、[29]の製造方法。
[32]物品の認証方法であって、認証対象物に付された、フォトクロミック反応による着色及び/又は着色後の消色速度が異なる2以上のフォトクロミック化合物を含んでなるセキュリティマークに励起光を照射する手順と、励起光照射後の前記セキュリティマークによる吸収スペクトル及び/又は反射スペクトルの経時変化に関する第一のセキュリティ情報を取得する手順と、を含む認証方法。
[33]物品の認証方法であって、認証対象物に付された、フォトクロミック反応による着色及び/又は着色後の消色速度が異なる2以上のフォトクロミック化合物を含んでなるセキュリティマークによる吸収スペクトル及び/又は反射スペクトルの経時変化に関する第一のセキュリティ情報と、基準情報と、を照合する手順を含む認証方法。
[34]前記認証対象物が、有価証券、銀行券、クレジットカード、キャッシュカード、パスポート、身分証明文書、運転免許証、切手、納税印紙、乗車券、入場券、消費財又はそれらの包装である[31]~[33]のいずれかの認証方法。
また、「物品」とは、上記セキュリティマークを付されて本発明に係る認証方法の「認証対象物」となり得るものである。「物品」には、有価証券、銀行券(紙幣)、クレジットカード、キャッシュカード、パスポート、身分証明文書、運転免許証、切手、納税印紙、乗車券、入場券、消費財及びそれらの包装などが広く包含される。セキュリティマークは、当該セキュリティマークが付された一つの認証対象物又は一群の認証対象物と、他のセキュリティマークが付された他の一つの認証対象物又は他の一群の認証対象物と、を区別可能とする情報(セキュリティ情報)を含む。
本発明に係るセキュリティマーク認証方法は、以下のプロセスを含む。
(1)フォトクロミック化合物を含んでなるセキュリティマークに励起光を照射するプロセス(照射プロセス)。
(2)励起光照射後のセキュリティマークによる吸収スペクトル及び/又は反射スペクトルの経時変化に関する第一のセキュリティ情報を取得するプロセス(第一情報取得プロセス)。
(3)取得された第一のセキュリティ情報と、セキュリティマークについて予め取得した第一のセキュリティ情報とを照合するプロセス(第一照合プロセス)。
(4)セキュリティマークから放出される蛍光のスペクトルに関する第二のセキュリティ情報を取得するプロセス(第二情報取得プロセス)。
(5)取得された第二のセキュリティ情報と、セキュリティマークについて予め取得した第二のセキュリティ情報とを照合するプロセス(第二照合プロセス)。
照射プロセスでは、フォトクロミック化合物を含んでなるセキュリティマークに励起光を照射する。励起光は、紫外光及び/又は波長400~600nmの光を含む。なお、本発明に係るセキュリティマークの認証方法は、照射プロセスの前段手順として、セキュリティマークを製造するプロセスを含んでいてもよい。当該製造プロセスについては、本発明に係るセキュリティマーク用インクの製造方法及びセキュリティマークの製造方法の項で詳しく後述する。
第一情報取得プロセスでは、励起光照射後のセキュリティマークによる吸収スペクトル及び/又は反射スペクトルの経時変化に関する第一のセキュリティ情報が取得される。
第一照合プロセスでは、第一情報取得プロセスで取得された第一のセキュリティ情報と、セキュリティマークについて予め取得した第一のセキュリティ情報との照合が行われる。
条件2:励起光照射直後から照射後0.1秒までは、780nm付近の吸収が存在すること(図4参照)。
条件3:励起光照射後0.2秒の吸収ピークが470nm付近にあること。
条件4:励起光照射後0.5秒の吸収ピークが550nm付近にあること。
なお、フォトクロミック反応により、化合物Aは780nm付近、化合物Bは470nm付近、フォトクロミック化合物Cは550nm付近に吸収を生じる。化合物A,B,Cの消色速度はA,B,Cの順に速く、室温における半減期は化合物Aが約30ミリ秒、化合物Bが約100ミリ秒、化合物Cが約1秒である。
本発明に係るセキュリティマークの認証方法において、セキュリティマークはフォトクロミック化合物に加えて蛍光物質を含んでいてもよく、この場合には、セキュリティマークから放出される蛍光のスペクトルに関する第二のセキュリティ情報を取得する第二情報取得プロセスが実行される。蛍光物質は、特に限定されず、従来公知の化合物を採用できる。
第二照合プロセスでは、取得された第二のセキュリティ情報と、セキュリティマークについて予め取得した第二のセキュリティ情報とを照合する。
次に、本発明に係るセキュリティマークの認証方法に用いることができる認証装置について説明する。図7及び図8に、本発明に係るセキュリティマークの認証装置の構成を示す。
測定部2は、セキュリティマークMに紫外光及び/又は波長400~600nmの光を含む励起光を照射する励起用光源21と、セキュリティマークMに可視光及び/又は近赤外光を照射する測定用光源22と、を含む(図8参照)。また、測定部2は、セキュリティマークMによる可視光及び/又は近赤外光の透過光又は反射光を検出する光検出器23を有する。
解析部3は、CPU31、メモリ32、ハードディスク33、マウス34及びキーボード35等の入力部、ディスプレイ36及びプリンタ37等の表示部などから構成されている。解析部3には、汎用のコンピュータとプログラムにより構成することができる。
[セキュリティマーク用インク]
本発明に係るセキュリティマーク用インクは、フォトクロミック特性の異なる2以上フォトクロミック化合物を含んでなり、より具体的には、フォトクロミック反応による着色及び/又は着色後の消色速度が異なる2以上のフォトクロミック化合物を含んでなる。
本発明に係るセキュリティマークは、フォトクロミック特性の異なる2以上のフォトクロミック化合物を含んでなり、より具体的には、フォトクロミック反応による着色及び/又は着色後の消色速度が異なる2以上のフォトクロミック化合物を含んでなる。本発明に係るセキュリティマークは、認証対象物に上記のセキュリティマーク用インクを塗装又は印刷等することにより形成できる。
Claims (17)
- セキュリティマークの認証方法であって、
フォトクロミック化合物を含んでなるセキュリティマークに励起光を照射するプロセスと、
励起光照射後の前記セキュリティマークによる吸収スペクトル及び/又は反射スペクトルの経時変化に関する第一のセキュリティ情報を取得するプロセスと、
を含む認証方法。 - 取得された第一のセキュリティ情報と、前記セキュリティマークについて予め取得した第一のセキュリティ情報とを照合するプロセスをさらに含む、請求項1記載の認証方法。
- 取得された第一のセキュリティ情報を取得時の温度により校正して、前記セキュリティマークについて予め取得した第一のセキュリティ情報との照合を行う、請求項2記載の認証方法。
- 前記セキュリティマークが、フォトクロミック反応による着色及び/又は着色後の消色速度が異なる2以上のフォトクロミック化合物を含んでなる、請求項1~3のいずれか一項に記載の認証方法。
- 前記セキュリティマークがさらに蛍光物質を含んでなり、
前記セキュリティマークから放出される蛍光のスペクトルに関する第二のセキュリティ情報を取得するプロセスと、
取得された第二のセキュリティ情報と、前記セキュリティマークについて予め取得した第二のセキュリティ情報とを照合するプロセスをさらに含む、請求項1~4のいずれか一項に記載の認証方法。 - 前記第一のセキュリティ情報を時間分解吸収スペクトル及び/又は反射スペクトル測定により取得する、請求項1~5のいずれか一項に記載の認証方法。
- セキュリティマークに紫外光及び/又は波長400~600nmの光を含む励起光を照射する励起用光源と、
前記セキュリティマークに可視光及び/又は近赤外光を照射する測定用光源と、
前記セキュリティマークによる前記可視光及び/又は近赤外光の透過光又は反射光を検出する光検出器と、
該光検出器からの出力される信号を、励起光照射後の前記セキュリティマークによる吸収スペクトル及び/又は反射スペクトルの経時変化に関する第一のセキュリティ情報として格納する解析部と、
を含む、セキュリティマークの認証装置。 - 表示部をさらに備え、
前記解析部は、前記セキュリティマークについて予め取得した第一のセキュリティ情報を保持し、
取得された第一のセキュリティ情報と、保持された第一のセキュリティ情報とを照合し結果を前記表示部に出力する、請求項7記載の認証装置。 - 前記解析部は、前記フォトクロミック化合物の消色速度と温度との関係を規定した校正情報を保持し、
該校正情報に基づき、取得された第一のセキュリティ情報を取得時の温度により校正して、保持された第一のセキュリティ情報との照合を行う、請求項8記載の認証装置。 - フォトクロミック反応による着色及び/又は着色後の消色速度が異なる2以上のフォトクロミック化合物を含んでなるセキュリティマーク用インク。
- フォトクロミック反応による着色及び/又は着色後の消色速度が異なる2以上のフォトクロミック化合物を混合し、励起光照射後の吸収スペクトル及び/又は反射スペクトルの経時変化パターンを作成する工程を含む、セキュリティマーク用インクの製造方法。
- フォトクロミック反応による着色及び/又は着色後の消色速度が異なる2以上のフォトクロミック化合物を含んでなるセキュリティマーク。
- フォトクロミック反応による着色及び/又は着色後の消色速度が異なる2以上のフォトクロミック化合物を混合し、励起光照射後の吸収スペクトル及び/又は反射スペクトルの経時変化パターンを作成する工程を含む、セキュリティマークの製造方法。
- フォトクロミック反応による着色及び/又は着色後の消色速度が異なる2以上のフォトクロミック化合物を含んでなるセキュリティマークが付された物品。
- 物品の認証方法であって、
認証対象物に、フォトクロミック反応による着色及び/又は着色後の消色速度が異なる2以上のフォトクロミック化合物を含んでなるセキュリティマークを付す手順を含む認証方法。 - 物品の認証方法であって、
認証対象物に付された、フォトクロミック反応による着色及び/又は着色後の消色速度が異なる2以上のフォトクロミック化合物を含んでなるセキュリティマークに励起光を照射する手順と、
励起光照射後の前記セキュリティマークによる吸収スペクトル及び/又は反射スペクトルの経時変化に関する第一のセキュリティ情報を取得する手順と、を含む認証方法。 - 物品の認証方法であって、
認証対象物に付された、フォトクロミック反応による着色及び/又は着色後の消色速度が異なる2以上のフォトクロミック化合物を含んでなるセキュリティマークによる吸収スペクトル及び/又は反射スペクトルの経時変化に関する第一のセキュリティ情報と、基準情報と、を照合する手順を含む認証方法。
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