WO2012018084A1 - 発光媒体および発光媒体の確認方法 - Google Patents

発光媒体および発光媒体の確認方法 Download PDF

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Publication number
WO2012018084A1
WO2012018084A1 PCT/JP2011/067878 JP2011067878W WO2012018084A1 WO 2012018084 A1 WO2012018084 A1 WO 2012018084A1 JP 2011067878 W JP2011067878 W JP 2011067878W WO 2012018084 A1 WO2012018084 A1 WO 2012018084A1
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WO
WIPO (PCT)
Prior art keywords
light
color
phosphor
region
fluorescent ink
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2011/067878
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English (en)
French (fr)
Japanese (ja)
Inventor
陽子 関根
山本　学
北村　満
山内　豪
明子 北村
桜子 羽鳥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dai Nippon Printing Co Ltd
Original Assignee
Dai Nippon Printing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dai Nippon Printing Co Ltd filed Critical Dai Nippon Printing Co Ltd
Priority to CN201180038272.5A priority Critical patent/CN103025535B/zh
Priority to PL11814709T priority patent/PL2602119T3/pl
Priority to EP11814709.9A priority patent/EP2602119B1/en
Priority to US13/814,094 priority patent/US8523238B2/en
Priority to CA2807458A priority patent/CA2807458C/en
Publication of WO2012018084A1 publication Critical patent/WO2012018084A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • 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
    • 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
    • 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
    • G07D7/20—Testing patterns thereon
    • G07D7/202—Testing patterns thereon using pattern matching
    • G07D7/205—Matching spectral properties
    • B42D2035/24—
    • 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

Definitions

  • the present invention relates to a light-emitting medium having a light-emitting image that appears when invisible light within a specific wavelength region is irradiated.
  • the present invention also relates to a method for confirming the light emitting medium.
  • 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.
  • the fluorescent ink it is possible to form a fluorescent image (light-emitting image) that appears only when invisible light within a specific wavelength region is irradiated on securities or the like.
  • a general-purpose color printer or the like it is possible to prevent the securities from being easily forged by a general-purpose color printer or the like.
  • Patent Document 1 discloses a medium having a luminescent image formed using a first fluorescent ink and a second fluorescent ink.
  • the first fluorescent ink and the second fluorescent ink are visually recognized as the same color under visible light and ultraviolet light when viewed with the naked eye, and are different from each other when viewed through the determination tool.
  • the ink is visible as a color. For this reason, the luminescent image formed in the securities is not easily counterfeited, and this enhances the counterfeit prevention effect by the fluorescent ink.
  • the procedure for determining whether the securities are counterfeited is carried out simply and quickly.
  • the medium constituting the securities exhibits various responses to different irradiation light. That is, there is a need for a medium that can easily and reliably determine whether a securities has been forged by the naked eye without using a tool such as a discriminator.
  • An object of the present invention is to provide a light-emitting medium that can effectively solve such problems and a method for confirming the light-emitting medium.
  • the present invention relates to a luminescent medium having a luminescent image on a substrate, wherein the luminescent image has a first region containing a first phosphor and a second region containing a second phosphor, and has a first wavelength.
  • the first phosphor and the second phosphor emit light that is visually recognized as different colors
  • the invisible light in the second wavelength region is irradiated
  • the first phosphor and the second phosphor are visually recognized as different colors, and emit light having a different color from the color visually recognized when invisible light in the first wavelength region is irradiated. It is a luminescent medium.
  • the first phosphor and the second phosphor are visually recognized as the same color. May emit light of a certain color.
  • the first phosphor and the second phosphor emit light of colors that are visually recognized as different colors. It may emit light.
  • the color of the light emitted from the first phosphor when the invisible light in the first wavelength region and the invisible light in the second wavelength region are simultaneously irradiated, the color of the light emitted from the first phosphor, and the second
  • the color difference between the light emitted from the phosphor and the color of the light is preferably 10 or less, and more preferably 3 or less.
  • the first phosphor emits light of the first color when irradiated with invisible light in the first wavelength region, and is irradiated with invisible light in the second wavelength region.
  • the second phosphor emits light of a color that is visually recognized as the second color or the same color as the second color when irradiated with invisible light in the first wavelength region. Then, when invisible light in the second wavelength region is irradiated, light of a color that is visually recognized as the same color as the first color or the first color may be emitted.
  • the color of light emitted from the first phosphor when irradiated with invisible light in the first wavelength region, and the invisible light within the second wavelength region are irradiated.
  • the color difference between the light emitted from the second phosphor and the color of the light is preferably 10 or less, and more preferably 3 or less.
  • the color of light emitted from the second phosphor when irradiated with invisible light in the first wavelength region, and the first phosphor when irradiated with invisible light in the second wavelength region is preferably 10 or less, and more preferably 3 or less.
  • the first phosphor and the second phosphor have the same color. It emits light of a color that is visually recognized as the same color as the color of the base material.
  • the first region and the second region may be formed from the first phosphor and the second phosphor provided in the same predetermined pattern, respectively.
  • At least a part of the second region may be adjacent to the first region.
  • the first region has at least one first pattern region including the first phosphor
  • the second region includes at least one second pattern including the second phosphor.
  • the shape of the first pattern region may be substantially the same as the shape of the second pattern region.
  • the present invention provides a method for confirming a luminescent medium having a luminescent image on a substrate, the step of preparing the luminescent medium described above, and irradiating the luminescent medium with invisible light in a first wavelength region. A step of confirming that the first region and the second region are discriminated; and irradiating the light emitting medium with invisible light in the second wavelength region to discriminate the first region and the second region of the luminescent image. And a step of confirming the light emitting medium.
  • the invisible light in the first wavelength region and the invisible light in the second wavelength region are simultaneously irradiated onto the luminescent medium, and the first region and the second region of the luminescent image are discriminated. And a step of confirming that it is not performed.
  • the luminescent medium according to the present invention has a luminescent image on a substrate.
  • the luminescent image has a first region including the first phosphor and a second region including the second phosphor.
  • the first phosphor and the second phosphor emit light of a color that is visually recognized as a different color.
  • the first phosphor and the second phosphor are visually recognized as different colors, and when invisible light in the first wavelength region is irradiated. It emits light of a different color from the color visually recognized.
  • region is visually recognized when the invisible light in a 1st wavelength range or the invisible light in a 2nd wavelength range is irradiated independently. As a result, it is possible to easily and reliably confirm the light emission image.
  • 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 plan view showing a light emission image of the forgery prevention medium in the first embodiment of the present invention.
  • FIG. 3 is a cross-sectional view taken along line III-III of the luminescent image shown in FIG.
  • FIG. 4A is a diagram showing a fluorescence emission spectrum of the first fluorescent ink according to the first embodiment of the present invention.
  • FIG. 4B is a diagram showing a fluorescence emission spectrum of the second fluorescent ink according to the first embodiment of the present invention.
  • 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 plan view showing a light emission image of the forgery prevention medium in the first embodiment of the present invention.
  • FIG. 3 is a cross-sectional view taken along line III
  • FIG. 5 is an xy chromaticity diagram showing the chromaticity of fluorescence emitted from the first fluorescent ink and the second fluorescent ink in the first embodiment of the present invention.
  • FIG. 6A is a plan view showing a light emission image when UV-A is irradiated in the first embodiment of the present invention.
  • FIG. 6B is a plan view showing a light emission image when UV-C is irradiated in the first embodiment of the present invention.
  • FIG. 6C is a plan view showing a light emission image when UV-A and UV-C are simultaneously irradiated in the first embodiment of the present invention.
  • FIG. 7 is a plan view showing a light emission image of the forgery prevention medium in the first modification of the first embodiment of the present invention.
  • FIG. 9A is a plan view showing a light emission image when UV-A is irradiated in the first modification of the first embodiment of the present invention.
  • FIG. 9B is a plan view showing a light emission image when UV-C is irradiated in the first modification of the first embodiment of the present invention.
  • FIG. 9C is a plan view showing a light emission image when UV-A and UV-C are irradiated simultaneously in the first modification of the first embodiment of the present invention.
  • FIG. 9A is a plan view showing a light emission image when UV-A is irradiated in the first modification of the first embodiment of the present invention.
  • FIG. 10 is an xy chromaticity diagram showing the chromaticity of fluorescence emitted from the first fluorescent ink and the second fluorescent ink in the third modification of the first embodiment of the present invention.
  • FIG. 11 is a plan view showing a light emission image when UV-A and UV-C are irradiated at the same time in the fourth modification of the first embodiment of the present invention.
  • FIG. 12A is a diagram showing a fluorescence emission spectrum of the first fluorescent ink according to the second embodiment of the present invention.
  • FIG. 12B is a diagram showing a fluorescence emission spectrum of the second fluorescent ink according to the second embodiment of the present invention.
  • FIG. 13 is an xy chromaticity diagram showing the chromaticity of fluorescence emitted from the first fluorescent ink and the second fluorescent ink in the second embodiment of the present invention.
  • FIG. 14A is a diagram showing a fluorescence emission spectrum of the first fluorescent ink in a modification of the second embodiment of the present invention.
  • FIG. 14B is a diagram showing a fluorescence emission spectrum of the second fluorescent ink in a modification of the second embodiment of the present invention.
  • FIG. 15 is an xy chromaticity diagram showing chromaticity of fluorescence emitted from the first fluorescent ink and the second fluorescent ink in a modification of the second embodiment of the present invention.
  • FIG. 14A is a diagram showing a fluorescence emission spectrum of the first fluorescent ink in a modification of the second embodiment of the present invention.
  • FIG. 14B is a diagram showing a fluorescence emission spectrum of the second fluorescent ink in a modification of the second embodiment of the present invention.
  • FIG. 15 is an
  • FIG. 16 is a plan view showing a light emission image of an anti-counterfeit medium in the third embodiment of the present invention.
  • 17 is a cross-sectional view taken along the line XVII-XVII of the luminescent image shown in FIG.
  • FIG. 18A is a plan view showing a light emission image when UV-A is irradiated in the third embodiment of the present invention.
  • FIG. 18B is a plan view showing a light emission image when UV-C is irradiated in the third embodiment of the present invention.
  • FIG. 18C is a plan view showing a light emission image when UV-A and UV-C are simultaneously irradiated in the third embodiment of the present invention.
  • FIG. 19 is a plan view showing a light emission image of a forgery prevention medium in a modification of the third embodiment of the present invention.
  • 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.
  • the anti-counterfeit medium 10 includes a base material 11 and a luminescent image 12 formed on the base material 11.
  • the light emission image 12 functions as an authenticity determination image for determining the authenticity of the forgery prevention medium 10.
  • the luminescent image 12 includes a pattern area (first area) 20 and a background area (second area) 25 formed adjacent to the pattern area 20.
  • first area first area
  • second area background area
  • the design area 20 is made up of the letter “A” (design), and the background area 25 is formed so as to surround the design area 20.
  • region 20 and 25 is formed by printing the fluorescent ink which is excited by invisible light and emits fluorescence so that it may mention later.
  • the material of the base material 11 used in the anti-counterfeit medium 10 is not particularly limited, and is appropriately selected according to the type of securities constituted by the anti-counterfeit medium 10.
  • 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 luminescent image 12 is not particularly limited, and is appropriately set according to the ease of authenticity determination and the required determination accuracy.
  • the lengths l 1 and l 2 of the luminescent image 12 are in the range of 1 to 210 mm and 1 to 300 mm, respectively.
  • FIGS. 2 is an enlarged plan view showing the luminescent image 12 under visible light
  • FIG. 3 is a cross-sectional view taken along the line III-III of the luminescent image 12 shown in FIG.
  • the pattern area 20 and the background area 25 of the luminescent image 12 are formed by solid-printing the first fluorescent ink 13 and the second fluorescent ink 14 on the substrate 11.
  • FIG. 3 shows an example in which the first fluorescent ink 13 in the pattern area 20 and the second fluorescent ink 14 in the background area 25 are in contact with each other.
  • the present invention is not limited to this, and a gap that cannot be visually recognized by the naked eye is formed between the first fluorescent ink 13 in the pattern area 20 and the second fluorescent ink 14 in the background area 25. Good. Further, the first fluorescent ink 13 and the second fluorescent ink 14 may overlap each other between the first fluorescent ink 13 in the pattern area 20 and the second fluorescent ink 14 in the background area 25.
  • the thicknesses t 1 and t 2 of the first fluorescent ink 13 and the second fluorescent ink 14 are appropriately set according to the type of securities, the printing method, etc.
  • the thickness t 1 is 0.3 to 100 ⁇ m.
  • the thickness t 2 is in the range of 0.3 to 100 ⁇ m.
  • the thickness t 1 and the thickness t 2 is almost the same. As a result, the boundary between the pattern area 20 and the background area 25 due to the difference between the thickness of the first fluorescent ink 13 and the thickness of the second fluorescent ink 14 can be suppressed.
  • each of the first fluorescent ink 13 and the second fluorescent ink 14 includes a predetermined phosphor that does not emit light under visible light but emits light under specific invisible light, for example, a granular pigment.
  • the particle size of the pigment contained in the inks 13 and 14 is, for example, in the range of 0.1 to 10 ⁇ m, and preferably in the range of 0.1 to 3 ⁇ m. For this reason, when visible light is irradiated to the inks 13 and 14, the light is scattered by the pigment particles. Therefore, when the luminescent image 12 is viewed under visible light, as shown in FIG. 2, the white picture area 21 a is visually recognized as the picture area 20 and the white background area 26 a is visually recognized as the background area 25.
  • the base material 11 in the present embodiment is formed from white polyethylene terephthalate.
  • the base material 11, the pattern area 20 and the background area 25 of the luminescent image 12 are all visually recognized as white. Therefore, the pattern of the pattern area 20 of the luminescent image 12 does not appear under visible light. This prevents the forgery prevention medium 10 having the luminescent image 12 from being easily forged.
  • the first boundary line 15 a between the pattern area 20 and the background area 25 and the second boundary line 15 b between the base material 11 and the luminescent image 12 are drawn for convenience. is there. Under visible light, the first boundary line 15a or the second boundary line 15b is not actually visually recognized.
  • FIG. 4A is a diagram illustrating a fluorescence emission spectrum of the first fluorescent ink 13
  • FIG. 4B is a diagram illustrating a fluorescence emission spectrum of the second fluorescence ink 14.
  • FIG. 5 is an xy chromaticity diagram showing the chromaticity of light emitted from the first fluorescent ink 13 and the second fluorescent ink 14 in the XYZ color system when light in a specific wavelength region is irradiated.
  • FIG. 4A an alternate long and short dash line indicates a fluorescence emission spectrum of the first fluorescent ink 13 when irradiated with ultraviolet rays (invisible light) in the wavelength region of 315 to 400 nm (in the first wavelength region), so-called UV-A.
  • the solid line shows the fluorescence emission spectrum of the first fluorescent ink 13 when irradiated with ultraviolet rays (invisible light) in the wavelength region of 200 to 280 nm (in the second wavelength region), so-called UV-C.
  • Each fluorescence emission spectrum shown in FIG. 4A is normalized so that the peak intensity at the maximum peak is 1.
  • the first fluorescent ink 13 when the first fluorescent ink 13 was irradiated with UV-A, it emitted green (first color) light having a peak wavelength ⁇ 1A of about 520 nm and was irradiated with UV-C. At this time, it emits red (second color) light having a peak wavelength ⁇ 1C of about 605 nm.
  • the first fluorescent ink 13 includes a so-called dichroic phosphor (first phosphor) whose emission color is different between UV-A irradiation and UV-C irradiation.
  • Such a dichroic phosphor is constituted, 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).
  • UV-A irradiation light having a wavelength of about 605 nm is also emitted as shown in FIG. 4A.
  • light having a wavelength of about 605 nm has a lower intensity than light having a peak wavelength ⁇ 1A of about 520 nm, the light from the first fluorescent ink 13 is visually recognized as green light during UV-A irradiation.
  • the alternate long and short dash line indicates the fluorescence emission spectrum of the second fluorescent ink 14 when UV-A is irradiated
  • the solid line indicates the fluorescence of the second fluorescent ink 14 when UV-C is irradiated.
  • the emission spectrum is shown.
  • each fluorescence emission spectrum shown in FIG. 4B is standardized so that the peak intensity at the maximum peak is 1.
  • the second fluorescent ink 14 has the same color as red (second color) light or red (second color) having a peak wavelength ⁇ 2A of about 610 nm when irradiated with UV-A. Emits light that is visible.
  • the second fluorescent ink 14 emits green (first color) light having a peak wavelength ⁇ 2C of about 525 nm or light visually recognized as the same color as green (first color) when irradiated with UV-C.
  • the second fluorescent ink 14 also includes a so-called dichroic phosphor that emits different colors when irradiated with UV-A and when irradiated with UV-C, as with the first fluorescent ink 13.
  • UV-C irradiation light having a wavelength of about 610 nm is also emitted as shown in FIG. 4B. However, since light having a wavelength of about 610 nm has a lower intensity than light having a peak wavelength ⁇ 2A of about 525 nm, the light from the second fluorescent ink 14 is visually recognized as green light during UV-C irradiation.
  • white triangles or circles indicate the chromaticities of light emitted from the first fluorescent ink 13 or the second fluorescent ink 14 during UV-A irradiation, respectively.
  • the black triangles or circles indicate the chromaticities of light emitted from the first fluorescent ink 13 or the second fluorescent ink 14 during UV-C irradiation, respectively.
  • the triangle or circle of the oblique line pattern indicates the chromaticity of light emitted from the first fluorescent ink 13 or the second fluorescent ink 14 when UV-A and UV-C are simultaneously irradiated.
  • the green color (first color) corresponds to the chromaticity indicated by the white triangle in FIG. 5, and the red color (second color) described above is the chromaticity indicated by the black triangle in FIG. It corresponds to.
  • the chromaticity of light emitted from the first fluorescent ink 13 during UV-A irradiation and the chromaticity of light emitted from the second fluorescent ink 14 during UV-A irradiation are as follows. It ’s far away. For this reason, the light emitted from the second fluorescent ink 14 during UV-A irradiation is visually recognized as light having a different color from the light emitted from the first fluorescent ink 13 during UV-A irradiation. For this reason, the pattern region 20 formed using the first fluorescent ink 13 and the background region 25 formed using the second fluorescent ink 14 are visually recognized as different color regions during UV-A irradiation. Accordingly, as will be described later, the pattern of the pattern area 20 is visually recognized during UV-A irradiation.
  • the chromaticity of light emitted from the first fluorescent ink 13 during UV-C irradiation and the chromaticity of light emitted from the second fluorescent ink 14 during UV-C irradiation Is far away.
  • the light emitted from the second fluorescent ink 14 during UV-C irradiation is visually recognized as light having a different color from the light emitted from the first fluorescent ink 13 during UV-C irradiation.
  • the pattern area 20 formed using the first fluorescent ink 13 and the background area 25 formed using the second fluorescent ink 14 are visually recognized as different color areas during UV-C irradiation. Therefore, as will be described later, the pattern of the pattern area 20 is visually recognized even during UV-C irradiation.
  • the pattern region 20 formed using the first fluorescent ink 13 and the background region 25 formed using the second fluorescent ink 14 have the same color when UV-A and UV-C are simultaneously irradiated. Visible as a region. Therefore, as will be described later, when UV-A and UV-C are simultaneously irradiated, the entire luminescent image 12 is visually recognized as a yellow (third color) image, and thus the pattern of the picture region 20 does not appear.
  • the light emitted from the second fluorescent ink 14 (light (2AC)) and the light emitted from the first fluorescent ink 13 (light (1AC)) become the same color light. This will be described in more detail.
  • the chromaticity of the emitted light (light (2C)) is close.
  • the chromaticity of light (light (1C)) emitted from the first fluorescent ink 13 at the time of UV-C irradiation and the light (light (light (1)) emitted from the second fluorescent ink 14 at the time of UV-A irradiation. 2A)) is close to the chromaticity.
  • the color of the light (1AC) emitted from the first fluorescent ink 13 at the time of simultaneous irradiation with UV-A and UV-C appears when the color of the light (1A) and the color of the light (1C) are additively mixed. It has become a color.
  • the color of the light (2AC) emitted from the second fluorescent ink 14 when UV-A and UV-C are simultaneously irradiated is obtained by additively mixing the color of the light (2A) and the color of the light (2C). It is a color that appears.
  • the chromaticity of light (1A) and the chromaticity of light (2C) are close to each other, and the chromaticity of light (1C) and the chromaticity of light (2A) are also close to each other.
  • the intensity ratio between the light (2A) and the light (2C) by appropriately adjusting the intensity ratio between the light (2A) and the light (2C), the light (2AC) obtained based on the light (2A) and the light (2C) as shown in FIG.
  • the chromaticity can be close to the chromaticity of the light (1AC) obtained based on the light (1A) and the light (1C). Therefore, when UV-A and UV-C are simultaneously irradiated, the light (2AC) emitted from the second fluorescent ink 14 is visually recognized as the same color as the light (1AC) emitted from the first fluorescent ink 13.
  • “same color” means that the chromaticities of two colors are close to each other to the extent that the color difference cannot be determined with the naked eye. More specifically, “same color” means that the color difference ⁇ E * ab between the two colors is 10 or less, preferably 3 or less. The “different color” means that the color difference ⁇ E * ab between the two colors is larger than 10.
  • the color difference ⁇ E * ab is a value calculated based on L * , a * and b * in the L * a * b * color system, and is an index relating to a color difference when observed with the naked eye. Is the value.
  • L * in the L * a * b * color system, a * and b *, or tristimulus values X in the XYZ color system, Y and Z is calculated based on the spectrum of light.
  • a relationship according to a well-known conversion equation is established between L * , a *, and b * and the tristimulus values X, Y, and Z.
  • the tristimulus values can be measured by using a measuring instrument such as a spectrophotometer, a color difference meter, a colorimeter, a color meter, a chromaticity meter, for example.
  • the spectrophotometer can obtain the spectral reflectance of each wavelength, and therefore can measure the tristimulus values with high accuracy, and is therefore suitable for analyzing the color difference.
  • ⁇ E * ab for example, first, light from a plurality of media (inks) to be compared is measured with a spectrophotometer, and based on the result, tristimulus values X, Y, Z, or L * , a * , b * are calculated. Then, L * in a plurality of media (ink), a *, b difference * ( ⁇ L *, ⁇ a *, ⁇ b *) from to calculate the color difference on the basis of the following equation.
  • a base material 11 is prepared.
  • the base material 11 for example, a base material made of white polyethylene terephthalate having a thickness of 188 ⁇ m is used.
  • the first fluorescent ink 13 and the second fluorescent ink 14 a luminescent image composed of the pattern region 20 and the background region 25 is formed on the base material 11.
  • the first fluorescent ink 13 and the second fluorescent ink 14 for example, 25% by weight of dichroic phosphor having a predetermined fluorescent property, 8% by weight of microsilica, 2% by weight of organic bentonite, and alkyd resin 50 are used. Inks made into offset inks by adding 15% by weight and 15% by weight of an alkylbenzene solvent are used.
  • the dichroic phosphor (first phosphor) for the first fluorescent ink 13 for example, it is excited by ultraviolet light having a wavelength of 254 nm to emit red light, and is excited by ultraviolet light having a wavelength of 365 nm to emit green light.
  • a phosphor DE-RG (manufactured by Nemoto Special Chemical Co., Ltd.) that emits yellow light by being irradiated with ultraviolet rays having a wavelength of 254 nm and a wavelength of 365 nm simultaneously is used.
  • the dichroic phosphor (second phosphor) for the second fluorescent ink 14 for example, it is excited by ultraviolet light having a wavelength of 254 nm to emit green light, and is excited by ultraviolet light having a wavelength of 365 nm to emit red light.
  • a phosphor DE-GR manufactured by Nemoto Special Chemical Co., Ltd.
  • ultraviolet rays having a wavelength of 254 nm and a wavelength of 365 nm
  • the color difference ⁇ E * ab between the light emitted from the first fluorescent ink 13 and the light emitted from the second fluorescent ink 14 when ultraviolet rays having a wavelength of 365 nm and a wavelength of 254 nm are simultaneously irradiated is 10
  • the dichroic phosphors of the inks 13 and 14 are selected so as to be preferably 3 or less, respectively.
  • the color difference ⁇ E * ab is about 3, which is the limit of human eye discrimination ability (color discrimination ability). Therefore, by setting the color difference ⁇ E * ab to 3 or less, it becomes more difficult to distinguish the color with the naked eye.
  • composition of each component in the 1st fluorescent ink 13 and the 2nd fluorescent ink 14 is not restricted to the above-mentioned composition, According to the characteristic calculated
  • the anti-counterfeit medium 10 is observed under visible light.
  • the base material 11, the pattern region 20 and the background region 25 of the light-emitting image 12 are visually recognized as white (see FIG. 2). For this reason, the pattern of the pattern area
  • UV-A irradiation Next, the forgery prevention medium 10 at the time of UV-A irradiation is observed.
  • UV-A to be irradiated for example, ultraviolet light having a wavelength of 365 nm is used.
  • FIG. 6A is a plan view showing a light emission image 12 of the forgery prevention medium 10 at the time of UV-A irradiation.
  • the first fluorescent ink 13 forming the pattern area 20 contains the phosphor DE-RG, and therefore the first fluorescent ink 13 emits green light. Therefore, the pattern area 20 is visually recognized as the green portion 21b.
  • the second fluorescent ink 14 forming the background region 25 contains the phosphor DE-GR, and therefore the second fluorescent ink 14 emits red light. Therefore, the background region 25 is visually recognized as the red portion 26c.
  • the pattern area 20 and the background area 25 are visually recognized as different color areas during UV-A irradiation. Therefore, the pattern of the pattern area 20 of the luminescent image 12 is visually recognized during UV-A irradiation.
  • UV-C irradiation Next, the anti-counterfeit medium 10 during UV-C irradiation is observed.
  • UV-C to be irradiated for example, ultraviolet light having a wavelength of 254 nm is used.
  • FIG. 6B is a plan view showing the light emission image 12 of the forgery prevention medium 10 at the time of UV-C irradiation.
  • the first fluorescent ink 13 forming the pattern area 20 contains the phosphor DE-RG, and therefore the first fluorescent ink 13 emits red light. Therefore, the pattern area 20 is visually recognized as the red portion 21c.
  • the second fluorescent ink 14 forming the background region 25 contains the phosphor DE-GR, and therefore the second fluorescent ink 14 emits green light. Therefore, the background region 25 is visually recognized as the green portion 26b. In this way, the pattern area 20 and the background area 25 are visually recognized as different color areas during UV-C irradiation. Therefore, at the time of UV-C irradiation, the pattern of the pattern area 20 of the luminescent image 12 is visually recognized.
  • the color of light emitted from the first fluorescent ink 13 during UV-A irradiation and the color of light emitted from the second fluorescent ink 14 during UV-C irradiation are the same color. Further, the color of light emitted from the first fluorescent ink 13 during UV-C irradiation and the color of light emitted from the second fluorescent ink 14 during UV-A irradiation are the same color. For this reason, when the light applied to the light emitting image 12 composed of the picture area 20 and the background area 25 is switched between UV-A and UV-C, the color of the picture area 20 and the color of the background area 25 are changed. They will be reversed (switched).
  • the “inversion” of the color will be described more specifically.
  • the color of the pattern region 20 formed using the first fluorescent ink 13 is green, and the color of the background region 25 formed using the second fluorescent ink 14 is red. Yes.
  • the color of the pattern area 20 becomes red, which is the color of the background area 25 at the time of UV-A irradiation, while the color of the background area 25 is UV- It becomes green which is the color of the pattern area 20 at the time of A irradiation.
  • This color switching is the above-described “inversion” of the color.
  • the irradiation light is switched from UV-A to UV-C or vice versa, and by checking whether the color of the picture area 20 and the color of the background area 25 are reversed with each other, The reliability of confirming whether the securities comprising the forgery prevention medium 10 are genuine can be increased.
  • FIG. 6C is a plan view showing a light emission image 12 of the forgery prevention medium 10 when UV-A and UV-C are simultaneously irradiated.
  • the first fluorescent ink 13 emits yellow light which is light obtained by additively mixing green light at the time of UV-A irradiation and red light at the time of UV-C irradiation.
  • the second fluorescent ink 14 emits yellow light that is light obtained by additively mixing red light during UV-A irradiation and green light during UV-C irradiation.
  • region 20 is visually recognized as the yellow part 21d
  • region 25 is also visually recognized as the yellow part 26d.
  • the pattern area 20 and the background area 25 are visually recognized as areas of the same color. Therefore, when UV-A and UV-C are simultaneously irradiated, the pattern of the pattern area 20 of the luminescent image 12 is not visually recognized.
  • the forgery prevention medium 10 includes the base material 11, the pattern region 20 formed on the base material 11 using the first fluorescent ink 13 including the first phosphor, and the pattern. And a background region 25 formed on the substrate 11 using the second fluorescent ink 14 containing the second phosphor so as to be adjacent to the region 20.
  • the first phosphor of the first fluorescent ink 13 and the second phosphor of the second fluorescent ink 14 emit light of a color that is visually recognized as a different color.
  • the first phosphor of the first fluorescent ink 13 and the second phosphor of the second fluorescent ink 14 were visually recognized as different colors, and UV-A was irradiated. It emits light of a color different from the color that is sometimes viewed.
  • the first phosphor of the first fluorescent ink 13 and the second phosphor of the second fluorescent ink 14 have colors that are visually recognized as the same color (yellow). Emits light. Therefore, the pattern area 20 and the background area 25 are discriminated when UV-A or UV-C is irradiated alone, but are not discriminated when UV-A and UV-C are irradiated simultaneously. That is, the pattern of the pattern area 20 is visually recognized when UV-A or UV-C is irradiated alone, but is not visually recognized when UV-A and UV-C are simultaneously irradiated.
  • a light-emitting image composed of the pattern region 20 and the background region 25 during UV-A irradiation, UV-C irradiation, or simultaneous irradiation of UV-A and UV-C, respectively. 12 appearances can be changed.
  • the pattern of the region 20 can be prevented from appearing. According to these embodiments, it is possible to tighten the pass conditions for determining that the securities to be inspected are genuine. Accordingly, it is possible to increase the reliability of confirmation as to whether the securities comprising the forgery prevention medium 10 are genuine. Further, forgery of the forgery prevention medium 10 can be made more difficult.
  • the first phosphor of the first fluorescent ink 13 emits green (first color) light when irradiated with UV-A, and when irradiated with UV-C. , Emits red (second color) light.
  • the second phosphor of the second fluorescent ink 14 emits light of a color visually recognized as red (second color) or the same color as red (second color) when UV-A is irradiated, When UV-C is irradiated, light of a color that is visually recognized as the same color as green (first color) or green (first color) is emitted.
  • the pattern region 20 and the background region 25 of the luminescent image 12 are based on the first fluorescent ink 13 including the first phosphor and the second fluorescent ink 14 including the second phosphor.
  • the example formed by carrying out solid printing on the material 11 was shown.
  • the present invention is not limited to this.
  • the region 20 and the background region 25 may be formed.
  • an example in which the first fluorescent ink 13 and the second fluorescent ink 14 are printed in a stripe shape on the substrate 11 will be described with reference to FIGS. 7 to 9C.
  • FIG. 7 is a plan view showing a luminescent image 12 of the anti-counterfeit medium 10 under visible light in this modification
  • FIG. 8 is a cross-sectional view taken along the line VIII-VIII of the luminescent image 12 shown in FIG. is there.
  • the pattern area 20 and the background area 25 are formed by printing the first fluorescent ink 13 and the second fluorescent ink 14 on the base material 11 in a stripe shape. Has been.
  • the pattern area 20 and the background area 25 are each formed of white portions 21a and 26a arranged in a stripe shape. For this reason, the pattern of the pattern area
  • FIG. 9A is a plan view showing a light emission image 12 of the forgery prevention medium 10 at the time of UV-A irradiation.
  • the pattern area 20 and the background area 25 are each formed of a green portion 21b and a red portion 26c arranged in a stripe shape. For this reason, the pattern of the pattern area 20 of the luminescent image 12 is visually recognized during UV-A irradiation.
  • FIG. 9B is a plan view showing a light emission image 12 of the forgery prevention medium 10 at the time of UV-C irradiation.
  • the pattern area 20 and the background area 25 are each formed of a red portion 21c and a green portion 26b arranged in a stripe shape. For this reason, the pattern of the pattern area 20 of the light emission image 12 is visually recognized at the time of UV-C irradiation.
  • FIG. 9C is a plan view showing a light emission image 12 of the forgery prevention medium 10 when UV-A and UV-C are simultaneously irradiated.
  • the pattern area 20 and the background area 25 are each formed of a yellow portion 21d and a yellow portion 26d arranged in a stripe shape. For this reason, the pattern of the pattern area 20 of the luminescent image 12 does not appear when UV-A and UV-C are simultaneously irradiated.
  • region 25 are different. There are fewer parts to touch. For this reason, even if there is light that is irregularly reflected or refracted in the portion where the yellow portion 21d and the yellow portion 26d are in contact with each other, the yellow portion 21d and the yellow portion 26d are caused by such light. The possibility that the boundary between them is visually recognized is reduced.
  • the present invention is not limited to this, and the first fluorescent ink 13 and the second fluorescent ink 14 can be printed on the substrate 11 in various patterns.
  • the first fluorescent ink 13 and the second fluorescent ink 14 may be printed on the substrate 11 with halftone dots.
  • the halftone dot percentage at this time is not particularly limited, and the halftone dot percentage is appropriately set according to the characteristics required for the forgery prevention medium 10.
  • an ink containing phosphor DE-RG is used as the first fluorescent ink 13, and an ink containing phosphor DE-GR is used as the second fluorescent ink 14.
  • the first fluorescent ink 13 and the second fluorescent ink 14 may be inks of combination_2 or combination_3 in Table 1. Even in the case of combination_2 or combination_3, as in the case of combination_1, the first fluorescent ink 13 and the second fluorescent ink 14 are visually recognized as different colors when irradiated with UV-A or UV-C alone.
  • the ink emits a color that is visually recognized as the same color when UV-A and UV-C are simultaneously irradiated. For this reason, the reliability of confirmation whether the securities which consist of the forgery prevention medium 10 are regular can be made higher. Further, forgery of the forgery prevention medium 10 can be made more difficult.
  • Table 1 the colors shown in the column “UV-A” or “UV-C” are the first fluorescent ink 13 and the second fluorescent ink 14 when UV-A or UV-C is irradiated. The color of the light emitted from each is shown.
  • X 1 indicates the emission color at the time of UV-C irradiation
  • X 2 indicates the emission color at the time of UV-A irradiation.
  • the phosphor DE-RG is a phosphor that emits red light when irradiated with UV-C and emits green light when irradiated with UV-A.
  • the names shown in the column of “phosphor” all represent product names in the fundamental special chemistry.
  • the first phosphor of the first fluorescent ink 13 emits green (first color) light when irradiated with UV-A, and is irradiated with UV-C.
  • the second phosphor of the second fluorescent ink 14 emits red (second color) or red (second color) light when irradiated with UV-A.
  • An example of emitting light of a color visually recognized as the same color as the color) and emitting light of a color visually recognized as the same color as green (first color) or green (first color) when irradiated with UV-C showed that.
  • the color of the first phosphor and the color of the second phosphor are reversed when the light to be irradiated is switched between UV-A and UV-C.
  • the present invention is not limited to this.
  • the color of the light emitted from the fluorescent ink 14 may be different.
  • the color of light emitted from the first fluorescent ink 13 when irradiated with UV-C is different from the color of light emitted from the second fluorescent ink 14 when irradiated with UV-A. May be.
  • the first fluorescent ink 13 and the second fluorescent ink 14 emit light of a color that is visually recognized as the same color, and the ink at the time of UV-A irradiation
  • the first phosphor and the second phosphor may be selected so that the colors 13 and 14 and the colors of the inks 13 and 14 at the time of UV-C irradiation are different. This changes the appearance of the luminescent image 12 composed of the pattern area 20 and the background area 25 during UV-A irradiation, UV-C irradiation, or UV-A and UV-C simultaneous irradiation, respectively. Can be made.
  • the color of the substrate 11 is not limited to white, and the color of the first fluorescent ink 13 and the second fluorescent ink 14 when the substrate 11 is irradiated with UV-A and UV-C simultaneously ( The color of the first phosphor and the color of the second phosphor may be visually recognized as the same color.
  • FIG. 11 is a plan view showing a light emission image 12 when UV-A and UV-C are simultaneously irradiated.
  • the pattern area 20 and the background area 25 are visually recognized as yellow portions 21d and 26d, respectively.
  • the base material 11 is formed from the material which reflects yellow light. For this reason, when not only UV-A and UV-C but also visible light is present, the substrate 11 is visually recognized as a yellow portion 11d. As a result, the pattern area 20, the background area 25, and the base material 11 are visually recognized as having the same color.
  • the reliability of checking whether the securities comprising the anti-counterfeit medium 10 are genuine or not. Can be further increased. Further, forgery of the forgery prevention medium 10 can be made more difficult.
  • the present invention is not limited to this.
  • Various colors of the base material 11 are used so that the colors of the first fluorescent ink 13 and the second fluorescent ink 14 are the same when UV-A and UV-C are simultaneously irradiated.
  • the color of the base material 11 is set to greenish blue.
  • the example in which the pattern area 20 is formed using the first fluorescent ink 13 and the background area 25 is formed using the second fluorescent ink 14 is shown.
  • the present invention is not limited to this, and the pattern area 20 may be formed using the second fluorescent ink 14 and the background area 25 may be formed using the first fluorescent ink 13.
  • the pattern of the pattern area 20 is visually recognized when UV-A or UV-C is irradiated alone, but is not visually recognized when UV-A and UV-C are simultaneously irradiated. This makes it difficult to forge the anti-counterfeit medium 10.
  • the present invention is not limited to this, and the first fluorescent ink 13 and the second fluorescent ink 14 may be ink having excitation characteristics with respect to UV-B or infrared rays. 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.
  • the background region 25 is formed so as to surround the pattern region 20.
  • the present invention is not limited to this, and it is only necessary that at least a part of the background area 25 is adjacent to the pattern area 20.
  • the pattern area 20 and the background area 25 are visually recognized as white under visible light.
  • the present invention is not limited to this, and it is sufficient that the pattern area 20 and the background area 25 are visually recognized as areas of the same color at least under visible light.
  • the color of light emitted from the first fluorescent ink 13 and the second fluorescent ink 14 when invisible light in the first wavelength region or invisible light in the second wavelength region is irradiated alone. Shows an example in which is one of blue, red, or green. However, the present invention is not limited to this.
  • invisible light in the first wavelength region or invisible light in the second wavelength region is irradiated alone, it is visually recognized as a different color, and invisible light in the first wavelength region and second Various combinations of inks that are visually recognized as the same color when invisible light in the wavelength region is simultaneously irradiated can be used as the inks 13 and 14.
  • the present invention is not limited to this, and the light emitting medium of the present invention can be used in various applications.
  • the light emitting medium of the present invention can be used in applications such as toys.
  • a luminescent image consisting of the pattern region and the background region is determined, and invisible light in the first wavelength region and By not being discriminated when invisible light within the second wavelength region is simultaneously irradiated, various functions and characteristics can be imparted to the toy and the like.
  • the first phosphor of the first fluorescent ink 13 and the example which the 2nd fluorescent substance of the 2nd fluorescent ink 14 light-emits the light of the color visually recognized as the same color mutually was shown.
  • the present invention is not limited to this.
  • invisible light in the first wavelength region and invisible light in the second wavelength region are simultaneously irradiated, for example, when UV-A and UV-C are simultaneously irradiated.
  • the first phosphor of the first fluorescent ink 13 and the second phosphor of the second fluorescent ink 14 may emit light having a color that is visually recognized as different colors.
  • FIGS. 12A to 13 include the first phosphor of the first fluorescent ink 13 that emits light of colors that are visually recognized as different colors when UV-A and UV-C are simultaneously irradiated.
  • the only difference is that the second phosphor of the second fluorescent ink 14 is used, and the other configuration is substantially the same as that of the above-described first embodiment or its modification.
  • FIG. 12A is a diagram showing a fluorescence emission spectrum of the first fluorescent ink 13
  • FIG. 12B is a diagram showing a fluorescence emission spectrum of the second fluorescence ink 14.
  • FIG. 13 is an xy chromaticity diagram showing the chromaticity of light emitted from the first fluorescent ink 13 and the second fluorescent ink 14 in the XYZ color system when light in a specific wavelength region is irradiated.
  • Second fluorescent ink As shown in FIG. 12A, when the first fluorescent ink 13 was irradiated with UV-A, it emitted green (first color) light having a peak wavelength ⁇ 1A of about 514 nm and was irradiated with UV-C. At this time, it emits red (second color) light having a peak wavelength ⁇ 1C of about 620 nm.
  • a dichroic phosphor (first phosphor) for the first fluorescent ink 13 for example, phosphor DCP No. 4a (manufactured by Nemoto Special Chemical) is used.
  • the second fluorescent ink 14 has the same color as red (second color) light or red (second color) having a peak wavelength ⁇ 2A of about 627 nm when irradiated with UV-A. Emits light that is visible.
  • the second fluorescent ink 14 emits green (first color) light having a peak wavelength ⁇ 2C of about 525 nm or light visually recognized as the same color as green (first color) when irradiated with UV-C.
  • a dichroic phosphor (second phosphor) for the second fluorescent ink 14 for example, phosphor DCP No. 8 (manufactured by Nemoto Special Chemical) is used.
  • the chromaticity of light emitted from the first fluorescent ink 13 in each of UV-A single irradiation, UV-C single irradiation, and UV-A and UV-C simultaneous irradiation is separated. That is, the color of light emitted from the first fluorescent ink 13 and the second fluorescent ink 14 in each of UV-A single irradiation, UV-C single irradiation, and UV-A and UV-C simultaneous irradiation, respectively. The color of the emitted light is different. Therefore, the pattern of the pattern area 20 of the luminescent image 12 is visually recognized at the time of UV-A single irradiation, UV-C single irradiation, and UV-A and UV-C simultaneous irradiation.
  • the pattern of the pattern area 20 of the luminescent image 12 is also visually recognized.
  • region 20 of the light emission image 12 can be confirmed by the combination of three colors. Accordingly, it is possible to increase the reliability of confirmation as to whether the securities comprising the forgery prevention medium 10 are genuine. Further, forgery of the forgery prevention medium 10 can be made more difficult.
  • the chromaticity of light emitted from the first fluorescent ink 13 during UV-A irradiation and the second fluorescent ink 14 during UV-C irradiation It is close to the chromaticity of the light emitted from. That is, as in the case of the first embodiment shown in FIG. 5 described above, the color of light emitted from the first fluorescent ink 13 during UV-A irradiation and the second fluorescent ink 14 emitted during UV-C irradiation. The color of the light is the same.
  • the chromaticity of light emitted from the first fluorescent ink 13 during UV-C irradiation and the chromaticity of light emitted from the second fluorescent ink 14 during UV-A irradiation are close to each other. That is, as in the case of the first embodiment shown in FIG. 5 described above, the color of light emitted from the first fluorescent ink 13 during UV-C irradiation and the second fluorescent ink 14 emitted during UV-A irradiation. The color of the light is the same.
  • the light irradiated on the luminescent image 12 composed of the pattern area 20 and the background area 25 is UV ⁇ .
  • the color of the pattern area 20 and the color of the background area 25 are reversed (switched).
  • the irradiation light is switched from UV-A to UV-C or vice versa, and by checking whether the color of the picture area 20 and the color of the background area 25 are reversed with each other, The reliability of confirming whether the securities comprising the forgery prevention medium 10 are genuine can be increased.
  • the phosphor DCP No. 1 is used as the first phosphor of the first phosphor ink 13. 4a is used, and the phosphor DCP No. 4 is used as the second phosphor of the second phosphor ink 14.
  • An example in which 8 is used is shown.
  • the present invention is not limited to this, and the first fluorescent ink 13 and the second fluorescent ink 14 are respectively used for UV-A single irradiation, UV-C single irradiation, and UV-A and UV-C simultaneous irradiation. Are visually recognized as different colors, and the color of the first fluorescent ink 13 and the color of the second fluorescent ink 14 are reversed when the irradiated light is switched between UV-A and UV-C. 2, various phosphors can be used as the first phosphor of the first fluorescent ink 13 and the second phosphor of the second fluorescent ink 14.
  • the first fluorescent ink 13 emits green light having a peak wavelength ⁇ 1A of about 514 nm when irradiated with UV-A, and the peak wavelength ⁇ 1 when irradiated with UV-C. Emits red light where 1C is about 610 nm.
  • a dichroic phosphor (first phosphor) for the first fluorescent ink 13 for example, phosphor DCP No. 4 (manufactured by Nemoto Special Chemical) is used.
  • the second fluorescent ink 14 emits blue light having a peak wavelength ⁇ 2A of about 400 nm when irradiated with UV-A.
  • the second fluorescent ink 14 emits green light having a peak wavelength ⁇ 2C of about 525 nm when irradiated with UV-C.
  • a dichroic phosphor (second phosphor) for the second fluorescent ink 14 for example, phosphor DCP No. 5 (manufactured by Nemoto Special Chemical) is used.
  • the chromaticity of the light emitted from the first fluorescent ink 13 in each of UV-A single irradiation, UV-C single irradiation, and simultaneous UV-A and UV-C irradiation is separated. That is, the color of light emitted from the first fluorescent ink 13 and the second fluorescent ink 14 in each of UV-A single irradiation, UV-C single irradiation, and UV-A and UV-C simultaneous irradiation, respectively. The color of the emitted light is different. Therefore, the pattern of the pattern area 20 of the luminescent image 12 is visually recognized at the time of UV-A single irradiation, UV-C single irradiation, and UV-A and UV-C simultaneous irradiation.
  • the pattern of the pattern area 20 of the luminescent image 12 is also visually recognized.
  • region 20 of the light emission image 12 can be confirmed by the combination of three colors. Accordingly, it is possible to increase the reliability of confirmation as to whether the securities comprising the forgery prevention medium 10 are genuine. Further, forgery of the forgery prevention medium 10 can be made more difficult.
  • the phosphor DCP No. 1 is used as the first phosphor of the first phosphor ink 13. 4 is used as the second fluorescent material of the second fluorescent ink 14.
  • An example is shown in which 5 is used.
  • the present invention is not limited to this, and the first fluorescent ink 13 and the second fluorescent ink 14 are respectively used for UV-A single irradiation, UV-C single irradiation, and UV-A and UV-C simultaneous irradiation.
  • the first region of the luminescent image 12 is composed of the pattern region 20, and the second region of the luminescent image 12 is composed of the background region 25 at least part of which is adjacent to the pattern region 20.
  • the form of the first region and the second region is not limited to the above-described form. As long as the 1st field is formed from the 1st fluorescent ink 13 containing the 1st fluorescent substance and the 2nd field is formed from the 2nd fluorescent ink 14 containing the 2nd fluorescent substance, the 1st field of various forms And a second region can be considered.
  • the first region of the luminescent image 12 has at least one first pattern region including the first phosphor
  • the two regions have at least one second pattern region including the second phosphor, and the first pattern region and the second pattern region are arranged independently of each other.
  • FIG. 16 is a plan view showing the emission image 12 under visible light
  • FIG. 17 is a cross-sectional view taken along the line XVII-XVII of the emission image 12 shown in FIG.
  • the luminescent image 12 includes a plurality of floral first pattern areas (first areas) 30, a plurality of floral second pattern areas (second areas) 35, and a blank area 50.
  • each first pattern region 30 includes a flower heart part 30a and a plurality of petal parts 30b arranged around the flower heart part 30a.
  • each second pattern region 35 includes a flower heart part 35a and a plurality of petal parts 35b arranged around the flower heart part 35a.
  • the shape of each first pattern region 30 is substantially the same as the shape of each second pattern region 35.
  • substantially the same refers to the first pattern region 30 and the second pattern region 35 when the first pattern region 30 and the second pattern region 35 are visually recognized as regions of the same color as described later. This means that the shape of the first pattern region 30 and the shape of the second pattern region 35 are similar to the extent that can be recognized as regions of the same type.
  • Each first pattern region 30 and each second pattern region 35 are arranged independently of each other. For example, as shown in FIG. 16, one first pattern region 30 is arranged apart from the other first pattern regions 30 and second pattern regions 35. Similarly, the one second pattern region 35 is disposed apart from the other second pattern region 35 and the first pattern region 30.
  • region 35 showed the example mutually spaced apart and arrange
  • the present invention is not limited to this, and each first pattern region 30 and each second pattern region 35 may be partially adjacent to each other as long as each can be recognized as a separate pattern region. Alternatively, they may partially overlap each other. That is, “arranged independently of each other” means that the first pattern areas 30 and the second pattern areas 35 are arranged so as to be recognized as separate pattern areas.
  • the first pattern region 30 and the second pattern region 35 of the luminescent image 12 are formed by printing the first fluorescent ink 13 and the second fluorescent ink 14 on the substrate 11. Since the thickness of the 1st fluorescent ink 13 and the thickness of the 2nd fluorescent ink 14 are substantially the same as the case of the above-mentioned 1st Embodiment, detailed description is abbreviate
  • white polyethylene terephthalate is used as in the case of the first embodiment.
  • each of the first fluorescent ink 13 and the second fluorescent ink 14 is a predetermined phosphor that does not emit light under visible light but emits light under specific invisible light, for example, Contains granular pigments.
  • the particle size of the pigment contained in the inks 13 and 14 is, for example, in the range of 0.1 to 10 ⁇ m, and preferably in the range of 0.1 to 3 ⁇ m. For this reason, when visible light is irradiated to the inks 13 and 14, the light is scattered by the pigment particles. Therefore, when the luminescent image 12 is viewed under visible light, the white portion 31a is visually recognized as the first pattern region 30 and the white portion 36a is visually recognized as the second pattern region 35, as shown in FIG.
  • the base material 11 is formed of white polyethylene terephthalate.
  • region 50 is visually recognized as the white part 51a under visible light. Therefore, under visible light, the first pattern region 30, the second pattern region 35, and the blank region 50 of the luminescent image 12 are all visually recognized as white. Therefore, the patterns of the pattern areas 30 and 35 of the luminescent image 12 do not appear under visible light. This prevents the forgery prevention medium 10 having the luminescent image 12 from being easily forged.
  • a base material 11 is prepared.
  • the base material 11 for example, a base material made of white polyethylene terephthalate having a thickness of 188 ⁇ m is used.
  • the luminescent image 12 having the first pattern region 30 and the second pattern region 35 is formed on the substrate 11 by printing using the first fluorescent ink 13 and the second fluorescent ink 14.
  • each first pattern region 30 and each second pattern region 35 are arranged so as to be independent from each other. For this reason, compared with the case where the 1st pattern area
  • the light emitting image 12 having the first pattern region 30 and the second pattern region 35 can be formed on the substrate 11 by using a simpler printing method or printing machine.
  • Examples of the first fluorescent ink 13 and the second fluorescent ink 14 include, for example, 25% by weight of a dichroic phosphor having predetermined fluorescence characteristics, 8% by weight of microsilica, 2% by weight of organic bentonite, 50% by weight of alkyd resin, and Inks made into offset inks by adding 15% by weight of an alkylbenzene solvent are used.
  • a dichroic phosphor having predetermined fluorescence characteristics 8% by weight of microsilica, 2% by weight of organic bentonite, 50% by weight of alkyd resin, and Inks made into offset inks by adding 15% by weight of an alkylbenzene solvent are used.
  • the dichroic phosphor (first phosphor) for the first fluorescent ink 13 for example, as in the case of the first embodiment described above, it is excited by UV-C and emits red light.
  • a phosphor DE-RG manufactured by Nemoto Special Chemical
  • the dichroic phosphor (second phosphor) for the second fluorescent ink 14 for example, as in the case of the first embodiment described above, it is excited by UV-C and emits green light.
  • a phosphor DE-GR manufactured by Nemoto Special Chemical Co., Ltd. that emits red light when excited by UV-A and emits yellow light when irradiated with UV-A and UV-C simultaneously is used.
  • the anti-counterfeit medium 10 is observed under visible light.
  • the first pattern region 30, the second pattern region 35, and the blank region 50 of the luminescent image 12 are visually recognized as white (see FIG. 16). For this reason, the pattern of each pattern area
  • FIG. 18A is a plan view showing a light emission image 12 of the forgery prevention medium 10 at the time of UV-A irradiation.
  • the first fluorescent ink 13 forming each first pattern region 30 contains the phosphor DE-RG, and therefore the first fluorescent ink 13 emits green light. Therefore, each 1st pattern area
  • region 30 is visually recognized as the green part 31b.
  • the second fluorescent ink 14 forming each second pattern region 35 contains the phosphor DE-GR, and therefore the second fluorescent ink 14 emits red light. Accordingly, each second pattern region 35 is visually recognized as a red portion 36c.
  • each first pattern region 30 and each second pattern region 35 are visually recognized as different color regions.
  • the color of the blank area 50 at the time of UV-A irradiation the following cases can be considered.
  • the blank area 50 when visible light is irradiated simultaneously with UV-A, the blank area 50 is visually recognized as a white portion 51a as shown in FIG. 18A.
  • the blank area 50 when only the UV-A is irradiated on the light-emitting image 12 under the condition where the visible light is shielded, the blank area 50 is visually recognized as a colorless portion (not shown).
  • FIG. 18B is a plan view showing the light emission image 12 of the forgery prevention medium 10 at the time of UV-C irradiation.
  • the first fluorescent ink 13 forming each first pattern region 30 contains the phosphor DE-RG, and therefore the first fluorescent ink 13 emits red light. Therefore, each 1st pattern area
  • region 30 is visually recognized as the red part 31c.
  • the second fluorescent ink 14 forming each second pattern region 35 contains the phosphor DE-GR, and therefore the second fluorescent ink 14 emits green light. Accordingly, each second pattern region 35 is visually recognized as a green portion 36b.
  • each first pattern region 30 and each second pattern region 35 are visually recognized as regions of different colors.
  • the following cases can be considered for the color of the blank area 50 during UV-C irradiation.
  • the blank area 50 is visually recognized as a white portion 51a.
  • the blank area 50 is visually recognized as a colorless portion (not shown).
  • the anti-counterfeit medium 10 Is confirmed to be genuine.
  • the color of light emitted from the first fluorescent ink 13 during UV-A irradiation and the color of light emitted from the second fluorescent ink 14 during UV-C irradiation are the same color. Further, the color of light emitted from the first fluorescent ink 13 during UV-C irradiation and the color of light emitted from the second fluorescent ink 14 during UV-A irradiation are the same color. For this reason, when the light applied to the light emitting image 12 including the first pattern region 30 and the second pattern region 35 is switched between UV-A and UV-C, the color of the first pattern region 30 and the first pattern region 30 are changed. The colors of the two pattern areas 35 are inverted (switched).
  • the irradiation light is switched from UV-A to UV-C or vice versa, and it is inspected whether the color of the first pattern area 30 and the color of the second pattern area 35 are reversed with each other at that time.
  • the reliability of confirmation whether the securities which consist of the forgery prevention medium 10 are regular can be made higher.
  • FIG. 18C is a plan view showing a light emission image 12 of the forgery prevention medium 10 when UV-A and UV-C are simultaneously irradiated.
  • the first fluorescent ink 13 emits yellow light which is light obtained by additively mixing green light at the time of UV-A irradiation and red light at the time of UV-C irradiation.
  • the second fluorescent ink 14 emits yellow light that is light obtained by additively mixing red light during UV-A irradiation and green light during UV-C irradiation.
  • region 30 is visually recognized as the yellow part 31d
  • region 35 is also visually recognized as the yellow part 36d.
  • the first pattern region 30 and the second pattern region 35 are visually recognized as regions of the same color. Accordingly, when UV-A and UV-C are simultaneously irradiated, each first pattern region 30 and each second pattern region 35 are visually recognized as regions of the same color.
  • a plurality of pattern regions 30 and 35 are formed in the luminescent image 12, and the phosphors included in the pattern regions 30 and 35 are made different, thereby changing the design of the luminescent image 12. Can be increased. Thereby, the designability of the luminescent image 12 can be improved.
  • each first pattern region 30 formed from the first fluorescent ink 13 has a floral pattern
  • all of these examples have floral patterns.
  • the shape of the first pattern region 30 and the second pattern region 35 included in the light emitting image 12 is not limited to one type.
  • the first pattern region 30 and the second pattern region 35 may include a star shape as well as a floral shape.
  • the star-shaped first pattern region 30 is formed of the first fluorescent ink 13 containing the first phosphor similarly to the floral first pattern region 30.
  • the star-shaped second pattern region 35 is formed from the second fluorescent ink 14 containing the second phosphor, similarly to the floral second pattern region 35.
  • the first pattern region 30 and the second pattern region 35 are visually recognized as different color regions when UV-A alone is irradiated and when UV-C alone is irradiated, and the same color is observed when UV-A and UV-C are simultaneously irradiated. Visible as a region.
  • the configuration of the luminescent image 12 can be made more complicated by increasing variations in the shape of each first pattern region 30 and each second pattern region 35. This makes it more difficult to forge the anti-counterfeit medium 10. Moreover, the design property of the light emission image 12 can be improved.
  • the first fluorescent ink 13 and the second fluorescent ink 14 are recognized as different colors when UV-A alone or UV-C alone is irradiated.
  • the colors of the first fluorescent ink 13 and the second fluorescent ink 14 are reversed to each other when they are visually recognized as the same color and the irradiated light is switched between UV-A and UV-C.
  • An example is shown.
  • the present invention is not limited to this, and as in the case of the second embodiment described above, the first fluorescent ink 13 and the second fluorescent ink 14 are not affected by each other even when UV-A and UV-C are simultaneously irradiated. It may be visually recognized as a different color.
  • the first fluorescence is switched when UV-A and UV-C are switched.
  • the color of the ink 13 and the color of the second fluorescent ink 14 do not have to be reversed.
  • the first fluorescent ink 13 and the second fluorescent ink 14 are examples in which ink having an excitation characteristic for UV-A or UV-C is used.
  • the present invention is not limited to this, and the first fluorescent ink 13 and the second fluorescent ink 14 may be ink having excitation characteristics with respect to UV-B or infrared rays. 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.
  • the present invention is not limited to this, and the light emitting medium of the present invention can be used in various applications.
  • the light-emitting medium of the present invention can also be used in applications such as toys.

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  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • General Physics & Mathematics (AREA)
  • Finance (AREA)
  • Accounting & Taxation (AREA)
  • Business, Economics & Management (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
PCT/JP2011/067878 2010-08-04 2011-08-04 発光媒体および発光媒体の確認方法 Ceased WO2012018084A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN201180038272.5A CN103025535B (zh) 2010-08-04 2011-08-04 发光介质及发光介质的确认方法
PL11814709T PL2602119T3 (pl) 2010-08-04 2011-08-04 Nośnik emitujący światło i sposób potwierdzania tego faktu
EP11814709.9A EP2602119B1 (en) 2010-08-04 2011-08-04 Light-emitting medium and method for confirming it
US13/814,094 US8523238B2 (en) 2010-08-04 2011-08-04 Light-emitting medium and method of confirming light-emitting medium
CA2807458A CA2807458C (en) 2010-08-04 2011-08-04 Light-emitting medium and method of confirming light-emitting medium

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JP2010-175709 2010-08-04
JP2010175709 2010-08-04
JP2011119208A JP5541583B2 (ja) 2010-08-04 2011-05-27 発光媒体および発光媒体の確認方法
JP2011-119208 2011-05-27

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CN105324250B (zh) * 2013-08-07 2017-03-08 卡巴-诺塔赛斯有限公司 印刷安全特征，包含此种印刷安全特征的物体，以及其生产方法
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CN105150715B (zh) * 2015-08-19 2017-04-26 中钞油墨有限公司 动态防伪元件及其制备方法和应用
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KR101784722B1 (ko) 2016-04-14 2017-10-12 한국조폐공사 보안용지 및 그 제조방법
EP3352145A1 (en) * 2017-01-23 2018-07-25 University of Copenhagen An optically detectable marker including luminescent dopants and system and method for reading such markers
DE112017006529B4 (de) * 2017-01-26 2022-07-14 Mitsubishi Electric Corporation Einstrahlungs-steuervorrichtung und einstrahlungs-verfahren
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JP7302281B2 (ja) * 2019-05-22 2023-07-04 大日本印刷株式会社 情報記録体、媒体及び冊子体
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JP2012051362A (ja) 2012-03-15
US8523238B2 (en) 2013-09-03
CN103025535B (zh) 2014-10-29
CA2807458C (en) 2016-12-20
EP2823968A3 (en) 2015-04-01
CN103903327A (zh) 2014-07-02
CN103903327B (zh) 2016-08-24
US20130127151A1 (en) 2013-05-23
CA2807458A1 (en) 2012-03-09
EP2602119A1 (en) 2013-06-12
CN103025535A (zh) 2013-04-03
PL2602119T3 (pl) 2016-03-31
JP5541583B2 (ja) 2014-07-09
EP2823968A2 (en) 2015-01-14
EP2823968B1 (en) 2016-04-20
EP2602119A4 (en) 2014-04-23

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