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 PDFInfo
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- 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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- Prior art keywords
- light
- color
- phosphor
- region
- fluorescent ink
- Prior art date
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- 238000000034 method Methods 0.000 title claims description 19
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 167
- 239000003086 colorant Substances 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims description 38
- 239000000758 substrate Substances 0.000 claims description 18
- 238000012790 confirmation Methods 0.000 claims description 10
- 230000001678 irradiating effect Effects 0.000 claims description 5
- 239000000976 ink Substances 0.000 description 317
- 230000002265 prevention Effects 0.000 description 49
- 230000004048 modification Effects 0.000 description 29
- 238000012986 modification Methods 0.000 description 29
- 238000010586 diagram Methods 0.000 description 23
- 238000002189 fluorescence spectrum Methods 0.000 description 15
- 239000000126 substance Substances 0.000 description 8
- -1 polyethylene terephthalate Polymers 0.000 description 7
- 229920000139 polyethylene terephthalate Polymers 0.000 description 7
- 239000005020 polyethylene terephthalate Substances 0.000 description 7
- 239000000049 pigment Substances 0.000 description 6
- 230000005284 excitation Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 229920000180 alkyd Polymers 0.000 description 2
- 150000004996 alkyl benzenes Chemical class 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910021487 silica fume Inorganic materials 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Images
Classifications
-
- 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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Abstract
Description
以下、図1乃至図6Cを参照して、本発明の第1の実施の形態について説明する。はじめに図1乃至図3を参照して、本発明の発光媒体からなる偽造防止媒体10全体について説明する。
図1は、本実施の形態による偽造防止媒体10により構成される商品券(有価証券)の一例を示す図である。図1に示すように、偽造防止媒体10は、基材11と、基材11上に形成された発光画像12と、を有している。本実施の形態においては、後述するように、発光画像12が、偽造防止媒体10の真偽を判別するための真偽判別用画像として機能する。この発光画像12は、図1に示すように、絵柄領域(第1領域)20と、絵柄領域20に隣接するよう形成された背景領域(第2領域)25と、からなっている。図1に示す例において、絵柄領域20は、「A」という文字(絵柄)からなっており、また背景領域25は、絵柄領域20を取り囲むよう形成されている。各領域20,25は、後述するように、不可視光により励起されて蛍光を発する蛍光インキを印刷することにより形成されている。
次に図2および図3を参照して、発光画像12についてより詳細に説明する。図2は、可視光下での発光画像12を拡大して示す平面図であり、図3は、図2に示す発光画像12のIII-III線に沿った断面図である。
なお、図2において、絵柄領域20と背景領域25との間の第1境界線15a、および、基材11と発光画像12との間の第2境界線15bは、便宜上描かれているものである。可視光下において、第1境界線15aまたは第2境界線15bは実際には視認されない。
次に図4A乃至図5を参照して、第1蛍光インキ13および第2蛍光インキ14についてより詳細に説明する。図4Aは、第1蛍光インキ13の蛍光発光スペクトルを示す図であり、図4Bは、第2蛍光インキ14の蛍光発光スペクトルを示す図である。図5は、特定の波長領域内の光が照射された場合に第1蛍光インキ13および第2蛍光インキ14から発光される光の色度をXYZ表色系で示すxy色度図である。
はじめに第1蛍光インキ13について説明する。図4Aにおいて、一点鎖線は、315~400nmの波長域領域内(第1波長領域内)の紫外線(不可視光)、いわゆるUV-Aが照射されたときの第1蛍光インキ13の蛍光発光スペクトルを示しており、実線は、200~280nmの波長域領域内(第2波長領域内)の紫外線(不可視光)、いわゆるUV-Cが照射されたときの第1蛍光インキ13の蛍光発光スペクトルを示している。なお図4Aに示す各蛍光発光スペクトルは、最大のピークにおけるピーク強度が1となるよう規格化されている。
なおUV-A照射時には、図4Aに示すように約605nmの波長の光も発光される。しかしながら、約605nmの波長の光は、ピーク波長λ1Aが約520nmである光に比べて強度が小さいため、UV-A照射時、第1蛍光インキ13からの光は緑色光として視認される。
次に第2蛍光インキ14について説明する。図4Bにおいて、一点鎖線は、UV-Aが照射されたときの第2蛍光インキ14の蛍光発光スペクトルを示しており、実線は、UV-Cが照射されたときの第2蛍光インキ14の蛍光発光スペクトルを示している。図4Aの場合と同様に、図4Bに示す各蛍光発光スペクトルは、最大のピークにおけるピーク強度が1となるよう規格化されている。
なおUV-C照射時には、図4Bに示すように約610nmの波長の光も発光される。しかしながら、約610nmの波長の光は、ピーク波長λ2Aが約525nmである光に比べて強度が小さいため、UV-C照射時、第2蛍光インキ14からの光は緑色光として視認される。
上記の三刺激値は、例えば分光光度計、色差計、測色計、色彩計、色度計等の計測器を用いることにより計測され得る。これらの計測器のうち分光光度計は、各波長の分光反射率を求めることができるので、三刺激値を精度良く計測することができ、このため色差の解析に適している。
色差ΔE* abを算出するには、例えば、はじめに、比較する複数の媒体(インキ)からの光を分光光度計にて計測し、その結果に基づいて、三刺激値X、Y、Z、またはL*、a*、b*を算出する。次に、複数の媒体(インキ)におけるL*、a*、b*の差(ΔL*、Δa*、Δb*)から、以下の式に基づいて色差を算出する。
はじめに基材11を準備する。基材11としては、例えば、厚み188μmの白色のポリエチレンテレフタレートからなる基材が用いられる。次に、第1蛍光インキ13および第2蛍光インキ14を用いて、基材11上に、絵柄領域20および背景領域25からなる発光画像を形成する。
次に、図2および図6A乃至図6Cを参照して、偽造防止媒体10からなる有価証券が正規のものであるかどうかを検査(確認)する方法について説明する。
はじめに、可視光下での偽造防止媒体10を観察する。この場合、上述のように、基材11、発光画像12の絵柄領域20および背景領域25はそれぞれ白色のものとして視認される(図2参照)。このため、可視光下においては、発光画像12の絵柄領域20のパターンは現れない。
次に、UV-A照射時の偽造防止媒体10を観察する。照射されるUV-Aとしては、例えば、波長365nmの紫外線が用いられる。
次に、UV-C照射時の偽造防止媒体10を観察する。照射されるUV-Cとしては、例えば、波長254nmの紫外線が用いられる。
以下、色の「反転」についてより具体的に説明する。UV-A照射時、第1蛍光インキ13を用いて形成される絵柄領域20の色は緑色となっており、第2蛍光インキ14を用いて形成される背景領域25の色は赤色となっている。その後、照射される光がUV-Cに切り替えられると、絵柄領域20の色は、UV-A照射時の背景領域25の色である赤色になり、一方、背景領域25の色は、UV-A照射時の絵柄領域20の色である緑色になる。このように色が切り替わることが、上述の色の「反転」である。
次に、UV-AおよびUV-Cを同時に照射した時の偽造防止媒体10を観察する。
また本実施の形態によれば、第1蛍光インキ13および第2蛍光インキ14の第1蛍光体および第2蛍光体を適切に選択することにより、UV-AおよびUV-Cの同時照射時に絵柄領域20のパターンが現れないようにすることができる。
これらの本実施の形態によれば、検査対象の有価証券が正規のものと判定されるための合格条件を厳しくすることができる。これによって、偽造防止媒体10からなる有価証券が正規のものであるかどうかの確認の信頼性を高くすることができる。また、偽造防止媒体10の偽造をより困難にすることができる。
なお本実施の形態において、発光画像12の絵柄領域20および背景領域25が、第1蛍光体を含む第1蛍光インキ13および第2蛍光体を含む第2蛍光インキ14を基材11上にベタ印刷することにより形成される例を示した。しかしながら、これに限られることはなく、第1蛍光体を含む第1蛍光インキ13および第2蛍光体を含む第2蛍光インキ14を同一の所定パターンで基材11上に印刷することにより、絵柄領域20および背景領域25を形成してもよい。以下、図7乃至図9Cを参照して、第1蛍光インキ13および第2蛍光インキ14が基材11上にストライプ状に印刷される例について説明する。
可視光下においては、図7に示すように、絵柄領域20および背景領域25はそれぞれ、ストライプ状に配置された白色部分21a,26aから形成されている。このため、可視光下においては、発光画像12の絵柄領域20のパターンは現れない。
図9Aは、UV-A照射時の偽造防止媒体10の発光画像12を示す平面図である。絵柄領域20および背景領域25はそれぞれ、ストライプ状に配置された緑色部分21bおよび赤色部分26cから形成されている。このため、UV-A照射時、発光画像12の絵柄領域20のパターンが視認される。
図9Bは、UV-C照射時の偽造防止媒体10の発光画像12を示す平面図である。絵柄領域20および背景領域25はそれぞれ、ストライプ状に配置された赤色部分21cおよび緑色部分26bから形成されている。このため、UV-C照射時、発光画像12の絵柄領域20のパターンが視認される。
図9Cは、UV-AおよびUV-Cを同時に照射した時の偽造防止媒体10の発光画像12を示す平面図である。絵柄領域20および背景領域25はそれぞれ、ストライプ状に配置された黄色部分21dおよび黄色部分26dから形成されている。このため、UV-AおよびUV-Cの同時照射時、発光画像12の絵柄領域20のパターンは現れない。
また本変形例においては、基材11上に第1蛍光インキ13および第2蛍光インキ14がベタ印刷される場合に比べて、絵柄領域20の黄色部分21dと背景領域25の黄色部分26dとが接する部分がより少なくなっている。このため、仮に黄色部分21dと黄色部分26dとが接する部分において不規則に反射または屈折する光が存在する場合であっても、そのような光に起因して黄色部分21dと黄色部分26dとの間の境界が視認される可能性が低減されている。
例えば、第1蛍光インキ13および第2蛍光インキ14が網点で基材11上に印刷されてもよい。この際の網点パーセントが特に限られることはなく、偽造防止媒体10に求められる特性に応じて網点パーセントが適宜設定される。
また本実施の形態において、第1蛍光インキ13として、蛍光体DE-RGを含むインキが用いられ、第2蛍光インキ14として、蛍光体DE-GRを含むインキが用いられる例を示した。すなわち、以下に示す表1における組合せ_1のインキが用いられる例を示した。しかしながら、これに限られることはなく、第1蛍光インキ13および第2蛍光インキ14として、表1における組合せ_2または組合せ_3のインキを用いてもよい。組合せ_2または組合せ_3の場合であっても、組合せ_1の場合と同様に、第1蛍光インキ13および第2蛍光インキ14は、UV-AまたはUV-Cが単独で照射されたとき異色として視認される色を発光し、UV-AおよびUV-Cが同時に照射されたとき同色として視認される色を発光するインキとなっている。このため、偽造防止媒体10からなる有価証券が正規のものであるかどうかの確認の信頼性をより高くすることができる。また、偽造防止媒体10の偽造をより困難にすることができる。
なお表1において、「UV-A」または「UV-C」の列に示されている色は、UV-AまたはUV-Cが照射されたときに第1蛍光インキ13および第2蛍光インキ14から発せられる光の色をそれぞれ示している。また、蛍光体の列において、「DE-X1X2」のうち、X1がUV-C照射時の発光色を示しており、X2がUV-A照射時の発光色を示している。例えば蛍光体DE-RGは、UV-C照射時に赤色光を発し、UV-A照射時に緑色光を発する蛍光体となっている。また、「蛍光体」の列に示されている名称は、いずれも根本特殊化学における製品名を表している。
また本実施の形態において、第1蛍光インキ13の第1蛍光体は、UV-Aが照射されたとき、緑色(第1色)の光を発光し、UV-Cが照射されたとき、赤色(第2色)の光を発光し、また第2蛍光インキ14の第2蛍光体は、UV-Aが照射されたとき、赤色(第2色)または、赤色(第2色)と同色として視認される色の光を発光し、UV-Cが照射されたとき、緑色(第1色)または緑色(第1色)と同色として視認される色の光を発光する例を示した。すなわち、照射される光がUV-AとUV-Cとの間で切り替えられると、第1蛍光体の色と第2蛍光体の色とが互いに反転する例を示した。
しかしながら、これに限られることはなく、図10に示すように、UV-Aが照射されたときに第1蛍光インキ13が発光する光の色と、UV-Cが照射されたときに第2蛍光インキ14が発光する光の色とが異色となっていてもよい。また、UV-Cが照射されたときに第1蛍光インキ13が発光する光の色と、UV-Aが照射されたときに第2蛍光インキ14が発光する光の色とが異色となっていてもよい。
すなわち、少なくとも、UV-AとUV-Cが同時に照射されたとき第1蛍光インキ13および第2蛍光インキ14が互いに同色として視認される色の光を発光するとともに、UV-A照射時のインキ13,14の色とUV-C照射時のインキ13,14の色とが異なるよう、第1蛍光体および第2蛍光体が選択されていればよい。これによって、UV-A照射時、UV-C照射時、または、UV-AとUV-Cの同時照射時のそれぞれにおいて、絵柄領域20と背景領域25とからなる発光画像12の見え方を変化させることができる。このことにより、検査対象の有価証券が正規のものと判定されるための合格条件を厳しくすることができる。これによって、偽造防止媒体10からなる有価証券が正規のものであるかどうかの確認の信頼性を高くすることができる。また、偽造防止媒体10の偽造をより困難にすることができる。
従って、UV-AとUV-Cが切り替えられたときに第1蛍光体の色と第2蛍光体の色とが反転関係にある必要は必ずしも無い。
また本実施の形態において、基材11の材料として、白色のポリエチレンテレフタレートが用いられる例を示した。しかしながら、基材11の色が白色に限られることはなく、基材11の色が、UV-AおよびUV-Cを同時に照射した時の第1蛍光インキ13および第2蛍光インキ14の色(第1蛍光体および第2蛍光体の色)と同色として視認される色となっていてもよい。
また本実施の形態において、絵柄領域20が第1蛍光インキ13を用いて形成され、背景領域25が第2蛍光インキ14を用いて形成される例を示した。しかしながら、これに限られることはなく、第2蛍光インキ14を用いて絵柄領域20を形成し、第1蛍光インキ13を用いて背景領域25を形成してもよい。この場合も、絵柄領域20のパターンは、UV-AまたはUV-Cが単独で照射されたときには視認されるが、一方、UV-AおよびUV-Cが同時に照射されたときには視認されない。このことにより、偽造防止媒体10の偽造を困難にすることができる。
次に、図12A乃至図13を参照して、本発明の第2の実施の形態について説明する。
図12A乃至図13を参照して、第1蛍光インキ13および第2蛍光インキ14について説明する。図12Aは、第1蛍光インキ13の蛍光発光スペクトルを示す図であり、図12Bは、第2蛍光インキ14の蛍光発光スペクトルを示す図である。図13は、特定の波長領域内の光が照射された場合に第1蛍光インキ13および第2蛍光インキ14から発光される光の色度をXYZ表色系で示すxy色度図である。
図12Aに示すように、第1蛍光インキ13は、UV-Aが照射されたとき、ピーク波長λ1Aが約514nmである緑色(第1色)の光を発し、UV-Cが照射されたとき、ピーク波長λ1Cが約620nmである赤色(第2色)の光を発する。このような第1蛍光インキ13用の二色性蛍光体(第1蛍光体)としては、例えば、蛍光体DCP No.4a(根本特殊化学製)が用いられる。
図12Bに示すように、第2蛍光インキ14は、UV-Aを照射されたとき、ピーク波長λ2Aが約627nmである、赤色(第2色)の光または赤色(第2色)と同色として視認される光を発する。また第2蛍光インキ14は、UV-Cを照射されたとき、ピーク波長λ2Cが約525nmである、緑色(第1色)の光または緑色(第1色)と同色として視認される光を発する。このような第2蛍光インキ14用の二色性蛍光体(第2蛍光体)としては、例えば、蛍光体DCP No.8(根本特殊化学製)が用いられる。
なお本実施の形態において、照射される光がUV-AとUV-Cとの間で切り替えられると、第1蛍光体から発せられる光の色と第2蛍光体から発せられる光の色とが互いに反転する例を示した。しかしながら、これに限られることはなく、図10に示す上述の第1の実施の形態の第3の変形例の場合と同様に、UV-Aが照射されたときに第1蛍光体が発光する光の色と、UV-Cが照射されたときに第2蛍光体が発光する光の色とが異色となっていてもよい。また、UV-Cが照射されたときに第1蛍光体が発光する光の色と、UV-Aが照射されたときに第2蛍光体が発光する光の色とが異色となっていてもよい。以下、このような変形例について、図14A乃至図15を参照して説明する。
図14Aに示すように、第1蛍光インキ13は、UV-Aが照射されたとき、ピーク波長λ1Aが約514nmである緑色の光を発し、UV-Cが照射されたとき、ピーク波長λ1Cが約610nmである赤色の光を発する。このような第1蛍光インキ13用の二色性蛍光体(第1蛍光体)としては、例えば、蛍光体DCP No.4(根本特殊化学製)が用いられる。
図14Bに示すように、第2蛍光インキ14は、UV-Aを照射されたとき、ピーク波長λ2Aが約400nmである青色の光を発する。また第2蛍光インキ14は、UV-Cを照射されたとき、ピーク波長λ2Cが約525nmである緑色の光を発する。このような第2蛍光インキ14用の二色性蛍光体(第2蛍光体)としては、例えば、蛍光体DCP No.5(根本特殊化学製)が用いられる。
次に、図16乃至図18Cを参照して、本発明の第3の実施の形態について説明する。
図16は、可視光下での発光画像12を示す平面図であり、図17は、図16に示す発光画像12のXVII-XVII線に沿った断面図である。はじめに図16を参照して、本実施の形態における発光画像12の絵柄について説明する。
はじめに基材11を準備する。基材11としては、例えば、厚み188μmの白色のポリエチレンテレフタレートからなる基材が用いられる。次に、第1蛍光インキ13および第2蛍光インキ14を用いて、印刷により、基材11上に、第1模様領域30および第2模様領域35を有する発光画像12を形成する。
次に、図18A乃至図18Cを参照して、偽造防止媒体10からなる有価証券が正規のものであるかどうかを確認する方法について説明する。
はじめに、可視光下での偽造防止媒体10を観察する。この場合、上述のように、発光画像12の第1模様領域30、第2模様領域35およびブランク領域50はそれぞれ白色のものとして視認される(図16参照)。このため、可視光下においては、各模様領域30,35のパターンは現れない。
次に、UV-A照射時の偽造防止媒体10を観察する。図18Aは、UV-A照射時の偽造防止媒体10の発光画像12を示す平面図である。各第1模様領域30を形成する第1蛍光インキ13は蛍光体DE-RGを含んでおり、このため、第1蛍光インキ13は緑色光を発光する。従って、各第1模様領域30が緑色部分31bとして視認される。一方、各第2模様領域35を形成する第2蛍光インキ14は蛍光体DE-GRを含んでおり、このため、第2蛍光インキ14は赤色光を発光する。従って、各第2模様領域35は赤色部分36cとして視認される。このように、UV-A照射時において、各第1模様領域30および各第2模様領域35は、異なった色の領域として視認される。
次に、UV-C照射時の偽造防止媒体10を観察する。図18Bは、UV-C照射時の偽造防止媒体10の発光画像12を示す平面図である。各第1模様領域30を形成する第1蛍光インキ13は蛍光体DE-RGを含んでおり、このため、第1蛍光インキ13は赤色光を発光する。従って、各第1模様領域30が赤色部分31cとして視認される。一方、各第2模様領域35を形成する第2蛍光インキ14は蛍光体DE-GRを含んでおり、このため、第2蛍光インキ14は緑色光を発光する。従って、各第2模様領域35は緑色部分36bとして視認される。このように、UV-C照射時において、各第1模様領域30および各第2模様領域35は、異なった色の領域として視認される。
次に、UV-AおよびUV-Cを同時に照射した時の偽造防止媒体10を観察する。
なお本実施の形態において、第1蛍光インキ13から形成される各第1模様領域30がいずれも花柄の形状を有し、第2蛍光インキ14から形成される各第2模様領域35がいずれも花柄の形状を有する例を示した。しかしながら、発光画像12に含まれる第1模様領域30および第2模様領域35の形状が一種類に限定されることはない。例えば図19に示すように、第1模様領域30および第2模様領域35が、花柄の形状のものだけでなく星形の形状のものを含んでいてもよい。
また上記第2および第3の実施の形態において、第1蛍光インキ13および第2蛍光インキ14として、UV-AまたはUV-Cに対する励起特性を有するインキが用いられる例を示した。しかしながら、これに限られることはなく、第1蛍光インキ13および第2蛍光インキ14として、UV-Bまたは赤外線に対する励起特性を有するインキを用いてもよい。すなわち、本発明における「第1波長領域内の不可視光」または「第2波長領域内の不可視光」として、任意の波長領域内の不可視光を用いることができる。
Claims (15)
- 基材上に発光画像を有する発光媒体において、
前記発光画像は、
第1蛍光体を含む第1領域と、
第2蛍光体を含む第2領域と、を有し、
第1波長領域内の不可視光が照射されたとき、前記第1蛍光体および前記第2蛍光体は、互いに異色として視認される色の光を発光し、
第2波長領域内の不可視光が照射されたとき、前記第1蛍光体および前記第2蛍光体は、互いに異色として視認されるとともに、第1波長領域内の不可視光が照射されたときに視認される色とは異色の光を発光する
ことを特徴とする発光媒体。 - 第1波長領域内の不可視光と第2波長領域内の不可視光とが同時に照射されたとき、前記第1蛍光体および前記第2蛍光体は、互いに同色として視認される色の光を発光する
ことを特徴とする請求項1に記載の発光媒体。 - 第1波長領域内の不可視光と第2波長領域内の不可視光とが同時に照射されたときに、前記第1蛍光体から発光される光の色と、前記第2蛍光体から発光される光の色と、の間の色差が10以下である
ことを特徴とする請求項2に記載の発光媒体。 - 第1波長領域内の不可視光と第2波長領域内の不可視光とが同時に照射されたときに、前記第1蛍光体から発光される光の色と、前記第2蛍光体から発光される光の色と、の間の色差が3以下である
ことを特徴とする請求項2に記載の発光媒体。 - 前記第1蛍光体は、第1波長領域内の不可視光が照射されたとき、第1色の光を発光し、第2波長領域内の不可視光が照射されたとき、第2色の光を発光し、
前記第2蛍光体は、第1波長領域内の不可視光が照射されたとき、前記第2色または第2色と同色として視認される色の光を発光し、第2波長領域内の不可視光が照射されたとき、前記第1色または第1色と同色として視認される色の光を発光する
ことを特徴とする請求項1に記載の発光媒体。 - 第1波長領域内の不可視光が照射されたときに前記第1蛍光体から発光される光の色と、第2波長領域内の不可視光が照射されたときに前記第2蛍光体から発光される光の色と、の間の色差が10以下であり、
第1波長領域内の不可視光が照射されたときに前記第2蛍光体から発光される光の色と、第2波長領域内の不可視光が照射されたときに前記第1蛍光体から発光される光の色と、の間の色差が10以下である
ことを特徴とする請求項5に記載の発光媒体。 - 第1波長領域内の不可視光が照射されたときに前記第1蛍光体から発光される光の色と、第2波長領域内の不可視光が照射されたときに前記第2蛍光体から発光される光の色と、の間の色差が3以下であり、
第1波長領域内の不可視光が照射されたときに前記第2蛍光体から発光される光の色と、第2波長領域内の不可視光が照射されたときに前記第1蛍光体から発光される光の色と、の間の色差が3以下である
ことを特徴とする請求項5に記載の発光媒体。 - 第1波長領域内の不可視光と第2波長領域内の不可視光とが同時に照射されたとき、前記第1蛍光体および前記第2蛍光体は、互いに同色として視認される色であって、前記基材の色と同色として視認される色の光を発光する
ことを特徴とする請求項1に記載の発光媒体。 - 第1波長領域内の不可視光と第2波長領域内の不可視光とが同時に照射されたとき、前記第1蛍光体および前記第2蛍光体は、互いに異色として視認される色の光を発光する
ことを特徴とする請求項1に記載の発光媒体。 - 前記第1領域および前記第2領域は、同一の所定パターンで設けられた前記第1蛍光体および前記第2蛍光体からそれぞれ形成される
ことを特徴とする請求項1に記載の発光媒体。 - 前記第2領域の少なくとも一部は、前記第1領域に隣接している
ことを特徴とする請求項1に記載の発光媒体。 - 前記第1領域は、前記第1蛍光体を含む少なくとも1つの第1模様領域を有し、
前記第2領域は、前記第2蛍光体を含む少なくとも1つの第2模様領域を有し、
前記第1模様領域および前記第2模様領域は、互いに独立して配置される
ことを特徴とする請求項1に記載の発光媒体。 - 前記第1模様領域の形状は、前記第2模様領域の形状と略同一である
ことを特徴とする請求項12に記載の発光媒体。 - 基材上に発光画像を有する発光媒体の確認方法において、
請求項1に記載の発光媒体を準備する工程と、
第1波長領域内の不可視光を発光媒体に照射して、発光画像の第1領域と第2領域とが判別されることを確認する工程と、
第2波長領域内の不可視光を発光媒体に照射して、発光画像の第1領域と第2領域とが判別されることを確認する工程と、
を備えた
ことを特徴とする発光媒体の確認方法。 - 第1波長領域内の不可視光と第2波長領域内の不可視光とを同時に発光媒体に照射して、発光画像の第1領域と第2領域とが判別されないことを確認する工程と、をさらに備えた
ことを特徴とする請求項14に記載の発光媒体の確認方法。
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- 2011-08-04 CA CA2807458A patent/CA2807458C/en not_active Expired - Fee Related
- 2011-08-04 CN CN201410099740.5A patent/CN103903327B/zh active Active
- 2011-08-04 EP EP14003411.7A patent/EP2823968B1/en not_active Not-in-force
- 2011-08-04 PL PL11814709T patent/PL2602119T3/pl unknown
- 2011-08-04 US US13/814,094 patent/US8523238B2/en not_active Expired - Fee Related
- 2011-08-04 CN CN201180038272.5A patent/CN103025535B/zh not_active Expired - Fee Related
- 2011-08-04 WO PCT/JP2011/067878 patent/WO2012018084A1/ja active Application Filing
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN105263718A (zh) * | 2013-05-13 | 2016-01-20 | 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 |
CN105263718B (zh) * | 2013-05-13 | 2017-03-29 | 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 |
Also Published As
Publication number | Publication date |
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JP5541583B2 (ja) | 2014-07-09 |
EP2823968A2 (en) | 2015-01-14 |
EP2823968A3 (en) | 2015-04-01 |
CA2807458A1 (en) | 2012-03-09 |
US20130127151A1 (en) | 2013-05-23 |
CN103903327B (zh) | 2016-08-24 |
CN103025535A (zh) | 2013-04-03 |
CN103025535B (zh) | 2014-10-29 |
EP2823968B1 (en) | 2016-04-20 |
US8523238B2 (en) | 2013-09-03 |
CN103903327A (zh) | 2014-07-02 |
EP2602119B1 (en) | 2015-10-07 |
EP2602119A1 (en) | 2013-06-12 |
PL2602119T3 (pl) | 2016-03-31 |
JP2012051362A (ja) | 2012-03-15 |
EP2602119A4 (en) | 2014-04-23 |
CA2807458C (en) | 2016-12-20 |
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