JPH10250211A - Fluorescent image formed material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a security level of preventing a forgery by incorporating a fluorescent material for emitting fluorescence having a wavelength of a visible light region by emitting an ultraviolet ray in a fluorescent image forming layer being substantially transparent to the light, and forming substantially the same image as the image formed by a visible image forming layer. SOLUTION: A red color emitting fluorescent image forming layer 2, first intermediate layer 3, green color emitting fluorescent image forming layer 4, second intermediate layer 5, blue color emitting fluorescent image forming layer 6 and third intermediate layer 7 are formed on a base 1 made of PET having a film thickness of 188μm. A fluorescent image forming layer X for forming a color image by an additive color mixing process by emitting fluorescence by ultraviolet ray being transparent for visible light is formed. And, a visible light image forming layer 8 is formed on a base 1 of another region, and formed by mounting a color photograph. The color layer X and the layer 8 are covered with a protective layer 9. Thus, whether it is a person himself or not can be collated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent image-forming product having a fluorescent image-forming layer containing a phosphor, which is hardly visible under visible light, and becomes visible by emitting fluorescent light in the visible region upon irradiation with ultraviolet rays. .

[0002]

2. Description of the Related Art In recent years, with respect to printed materials, such as securities such as cash vouchers and prepaid cards, for which counterfeiting has been required to be prevented, micro-characters, copy check patterns, infrared absorbing inks, etc. Fluorescent inks and the like are used.

On the other hand, in the case of passports, driver's licenses, credit cards, etc., in order to prevent fraudulent activities such as forgery, a photo of the person's face is attached or a face photo image is printed. These face photographs are used to verify the identity of the person.

[0004]

However, in a passport or the like on which the above-described face photograph is pasted or the face photograph image is printed, a forger can replace the face photograph or reprint the face photograph image. Forgery is possible, and the original purpose of verifying the identity of a person by a face photograph or the like is no longer fulfilling.

[0005] Further, in a passport or the like for verifying the identity of a person by applying a face photograph or printing a face photograph image, a fluorescent image forming layer is formed with the fluorescent light-emitting ink, and the fluorescent image forming layer is obtained by irradiating ultraviolet rays. There has not been known one that enables collation of an individual with a fluorescent image obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems. Accordingly, in printed matter for which forgery such as a passport is desired to be prevented, reprinting of a face photograph, reprinting of a face photograph image, and the like are performed. Even if forged, a fluorescent image formed with an improved security level of forgery prevention can be verified based on a fluorescent image obtained by irradiation with ultraviolet light, and can be confirmed as a fake. The purpose is to:

[0007]

In order to achieve the above-mentioned object, at least one fluorescent image-forming product of the present invention is provided on a substrate.
A fluorescent image forming product having a fluorescent image forming layer and at least one visible image forming layer, wherein the fluorescent image forming layer contains a phosphor that emits fluorescent light having a wavelength in a visible light region by irradiation with ultraviolet light. , Are substantially transparent to visible light, and form substantially the same image as the image formed by the visible image forming layer.

The above-mentioned fluorescent image formed article of the present invention has at least one visible image forming layer. For example, in a printed matter, such as a passport, for which forgery is desired to be prevented, the visible image formed by the visible image forming layer can be a face photograph image for verifying the identity of the user. Further, it has at least one fluorescent image forming layer and forms an image substantially the same as the visible image. As a result, even if the visible image portion is forged, it is possible to verify the identity of the person using the fluorescent image, and to compare the fluorescent image with the visible image to confirm that the forgery is performed. You can know. Since the fluorescent image forming layer is substantially transparent to visible light, its existence is hard to be noticed, and it is difficult for a forger to forge the fluorescent image forming layer. It is.

The fluorescent image forming layer is substantially transparent to visible light when it has the property of transmitting visible light, and when it is partially or wholly visible light over the entire visible light region. The case where the fluorescent image forming layer is white (colorless) due to the characteristic of reflection and the case where the color of the fluorescent image forming layer is substantially the same as the color of the substrate on which the fluorescent image forming layer is formed are visually observed. This includes cases where it is substantially difficult to ascertain the presence or absence.

In order to achieve the above object, the fluorescent image formed article of the present invention is a fluorescent image formed article having at least one fluorescent image forming layer and at least one visible image forming layer on a substrate. The fluorescent image-forming layer contains a phosphor that emits fluorescent light having a wavelength in the visible light region upon irradiation with ultraviolet light, is substantially transparent to visible light, and has an image formed by the visible image-forming layer. Related images are formed.

According to the above-mentioned fluorescent image formed article of the present invention,
The visible image and the fluorescent image form an associated image. When using substantially the same image, image data is created based on the visible image, a fluorescent image is created, and there is a risk of being forged, but such an image is used instead of the same image. Risk can be avoided. Relevant images here are limited as long as they are not completely unrelated to each other, such as the relationship between a face photo image from the front of a person and a face photo image from the side, or a face photo image and a seal image of a seal owned by the person. Not done.

In the above-mentioned fluorescent image formed article of the present invention, the visible image forming layer is preferably formed by a photograph or formed by a printing layer. According to the photograph or the printed layer, a visible image can be easily formed. By pasting a face photograph or the like on a passport or the like, it can be a means capable of verifying the identity of the person.

In the above-mentioned fluorescent image formed article of the present invention, preferably, the fluorescent image formed layer is a blue light-emitting fluorescent image formed layer,
Green light emitting fluorescent image forming layer, red light emitting fluorescent image forming layer 3
With layers. By having a fluorescent image forming layer that emits blue, green, and red light, a color image can be formed on the fluorescent image by the additive color mixing method. It is very difficult to imitate and manufacture a multicolored fluorescent image forming layer, which can make forgery of the fluorescent image formed product of the present invention even more difficult.

In the above-mentioned fluorescent image formed article of the present invention, preferably, the phosphor comprises an oxide or oxyacid salt-based inorganic phosphor, and more preferably, the phosphor comprises Sr ₃ (PO _{2) 3} C
l: Eu, ZnO: Zn, Zn ₂ SiO ₄ : Mn, Zn ₂ GeO ₄ : Mn, Y ₂ O ₃ : Eu, Y
It is an inorganic phosphor selected from (P, V) O ₄ : Eu, Y ₂ O ₂ S: Eu, and ZnS: Cu (Mn). Oxide or oxyacid salt-based inorganic phosphors are excellent in heat resistance, weather resistance such as moisture resistance, aging characteristics (durability), light resistance, etc., and have a relatively large particle size and high brightness. Since it is a stable material, printability can be improved.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a fluorescent image formed product according to an embodiment of the present invention. For example, a fluorescent image forming layer 2 for emitting red light is formed on an upper layer of the base 1, and a first intermediate layer 3 covers the upper layer. On the upper layer, for example, a fluorescent image forming layer 4 for emitting green light is formed.
Is coated. A blue light emitting fluorescent image forming layer 6 is formed on the upper layer, and a third intermediate layer 7 covers the upper layer. The above red, green, and blue fluorescent image forming layers 2,
4 and 6, a color fluorescent image forming layer X is formed by the additive color mixing method. In addition, a visible image forming layer 8 is formed on the upper layer of the base 1, and is formed by, for example, attaching a photograph. A protective layer 9 is formed to cover the fluorescent image forming layer X and the visible image forming layer 8.

The fluorescent light-emitting ink for forming the above-mentioned fluorescent image forming layer X (2, 4, 6) includes, as its components, fluorescent pigments, vehicles and auxiliaries in the same manner as ordinary printing inks. It contains. Here, the fluorescent pigment is red,
It is a phosphor that emits light of each color such as green and blue.

The fluorescent substance is a substance that emits fluorescence when irradiated with ultraviolet light, and can be roughly classified into an inorganic fluorescent substance and an organic fluorescent substance. Colorless phosphors that absorb little or no visible light can be broadly classified into colored phosphors having a certain absorption band in the visible region. In the present invention, it is preferable to use a colorless phosphor that absorbs little or no visible light.

As the colorless inorganic phosphor, Ca, Ba,
Mg, Zn, Cd and other oxides, sulfides, silicates, phosphates, tungstates, and other crystals as main components;
A pigment obtained by adding a metal element such as g, Ag, Cu, Sb, or Pb or a rare earth element such as a lanthanoid as an activator and calcining the same can be used.

Examples of inorganic phosphors that emit red light include Y ₂ O ₃ : Eu, YVO ₄ : Eu, Y ₂ O ₂ S: Eu, 3.5 MgO, 0.5 MgF
₂ GeO ₂ : Mn, (Y, Gd) BO ₃ : Eu, Y (P, V) O ₄ : Eu or the like can be used.

Examples of the inorganic phosphor that emits green light include ZnO: Zn, Zn ₃ SiO ₂ : Mn, Zn ₃ S: Cu, Al, (Zn, Cd) S: Cu,
Al, ZnS: Cu, Au, Al, Zn ₂ SiO ₄ : Mn, ZnS: Ag, Cu, (Zn, Cd)
S: Cu, ZnS: Cu, Gd ₂ O ₂ S: Tb, La ₂ O ₂ S: Tb, Y ₂ SiO ₅ : Ce, T
b, Zn ₂ GeO ₄ : Mn, CeMgAl ₁₁ O ₁₃ : Tb, SrGa ₂ S ₄ : Eu ²⁺ , ZnS: C
u, CO, MgO ・ nB ₂ O ₃ : Ce, Tb, LaOBr: Tb, Tm, La ₂ O ₂ S: Tb
, ZnS: Cu (Mn) or the like can be used.

Examples of inorganic phosphors that emit blue light include ZnS: Ag, CaWO ₄ , Y ₂ SiO ₅ : Ce, ZnS: Ag, Ga, Cl, Ca ₂
B ₅ O ₃ Cl: Eu ²⁺ , BaMgAl ₁₄ O ₂₃ : Eu ²⁺ , Sr ₃ (PO ₂ ) ₃ Cl: Eu, or the like can be used.

The organic phosphors include diaminostilbene disulfonic acid derivatives, imidazole derivatives, coumarin derivatives, triazoles, carbazoles, pyridines, and the like.
Derivatives such as naphthalic acid and imidazolone, dyes such as fluorescein and eosin, and compounds having a benzene ring such as anthracene can be used.

As the fluorescent light-emitting ink for forming the fluorescent image forming layer of each color, one kind of the above compounds and the like can be contained, but two or more kinds of phosphors having different fluorescence wavelength ranges are contained. Can also. When two or more types are contained, the same effect as emitting fluorescence in the wavelength region in which the wavelength regions of the respective phosphors are combined can be obtained, and a fluorescent light emitting ink of a color which has not been obtained conventionally can be obtained. it can.

In terms of weather resistance such as heat resistance and moisture resistance, and aging characteristics (durability), inorganic phosphors are excellent. On the other hand, organic phosphors have good wettability of the ink vehicle, and therefore have excellent suitability for producing inks without any particular surface treatment. Among the above-mentioned phosphors, in order to improve durability, weather resistance, especially light resistance or printability, a stable oxide or oxyacid salt-based inorganic phosphor having a relatively large particle size and high luminance. Is preferred. For example, Sr ₃ (PO ₂ ) ₃ Cl: Eu (blue), ZnO: Zn (green), Zn ₂ S
iO ₄ : Mn (green), Zn ₂ GeO ₄ : Mn (green), Y ₂ O ₃ : Eu (red), Y (P, V) O ₄ : Eu (red), Y ₂ O ₂ S: Eu ( Red), ZnS:
Cu (Mn) (green) can be preferably used.

It is preferable to adjust the particle size of the phosphor particles in order to improve the fluorescent characteristics such as luminance and the printability of the ink. As the phosphor particles, those composed of particles having an average particle diameter of 0.7 to 4 μm are preferably used, and more preferably, an average particle diameter of 0.7 to 2 μm.
m, most preferably from 1 to 2 μm. In general, it is expected that the smaller the particle size of the pigment particles, the better the ink properties will be. However, when the particle size of the phosphor particles is less than 0.7 μm, a phenomenon in which the brightness of the fluorescence is significantly reduced is observed. Therefore,
It is preferable to use phosphor particles having a particle size of 0.7 μm or more. On the other hand, when the particle size exceeds 4 μm, the transparency of the obtained fluorescence image may be reduced.

The content of the phosphor relative to the entire composition excluding the solvent constituting the fluorescent light-emitting ink is preferably from 15 to 80% by weight in order to improve both luminance and transferability (adhesion) to a printing substrate. And a more preferable range is 20 to 50% by weight. When the content of the phosphor is less than 15% by weight, the fluorescent brightness in the ink composition state is extremely lowered depending on the type of the fluorescent material. It may decrease to about 10.

Further, the properties of the phosphor (hiding power, coloring power,
It is preferable to perform a surface treatment to improve oil absorption, durability, etc.). In particular, when an inorganic phosphor is used, its surface is hydrophilic and has poor affinity for an oily polymer. Therefore, it is preferable to perform a surface treatment to improve the affinity for the polymer. For example, the following method can be used.

(A) Coating: The coating acts as a surfactant. For example, dispersants for low-molecular or high-molecular fatty acids, fatty acid salts and waxes can be used.

(B) Coupling agent: The coupling agent binds firmly to the phosphor and reacts with the polymer. For example, a silane compound, a titanium compound, a metal chelate compound, or the like can be used.

(C) Polymerizable monomer: An irreversible layer is formed by reacting a low molecular weight monomer or oligomer on the phosphor surface. For example, a polymerizable organic acid, a reactive oligomer, or the like can be used.

As the vehicle of the fluorescent light-emitting ink forming the fluorescent image forming layer of the present invention, those having substantially no absorption band in the wavelength region of ultraviolet light for exciting the phosphor and the wavelength region of visible light are used. preferable. Examples of the binder resin which is a main component of the vehicle include polyethylene [polyethylene (PE), ethylene-vinyl acetate copolymer (EVA), vinyl chloride-vinyl acetate copolymer], polypropylene (PP), vinyl [ Polyvinyl chloride (PV
C), polyvinyl butyral (PVB), polyvinyl alcohol (PVA), polyvinylidene chloride (PVd)
C), polyvinyl acetate (PVAc), polyvinyl formal (PVF)], polystyrene [polystyrene (P
S), styrene-acrylonitrile copolymer (AS),
Acrylonitrile-butadiene-styrene copolymer (A
BS)], acrylic [polymethyl methacrylate (P
MMA), MMA-styrene copolymer], polycarbonate (PC), cellulosic [ethyl cellulose (E
C), cellulose acetate (CA), propylcellulose (CP), acetic acid / cellulose acetate (CAB), cellulose nitrate (CN)], fluorine type (polychlorofluoroethylene (PCTFE), polytetrafluoroethylene (P
TFE), tetrafluoroethylene-hexafluoroethylene copolymer (FEP), polyvinylidene fluoride (PVdF)], urethane (PU), nylon (type 6, type 66, type 610, type 11), polyester (Alkyd) -based [polyethylene terephthalate (PET), polybutylene terephthalate (PB)
T), polycyclohexane terephthalate (PC
T)], and a thermoplastic resin such as a novolak type phenol resin. It is also possible to use thermosetting resins such as resol-type phenolic resins, urea resins, melamine resins, polyurethane resins, epoxies, unsaturated polyesters, and natural resins such as proteins, rubber, shellac, copal, starch, and rosin. it can.

In addition, these resins can be emulsions for aqueous coatings. Examples of emulsions for aqueous paints include vinyl acetate (homo) emulsion, vinyl acetate-acrylate copolymer emulsion, and vinyl acetate-ethylene copolymer resin emulsion (E).
VA emulsion), vinyl acetate-vinyl versatate copolymer resin emulsion, vinyl acetate-polyvinyl alcohol copolymer resin emulsion, vinyl acetate-vinyl chloride copolymer resin emulsion, acrylic emulsion, acrylic silicone emulsion, styrene-acryl copolymer resin emulsion, Polystyrene emulsion, urethane emulsion, chlorinated polyolefin emulsion,
Epoxy-acryl dispersion, SBR latex, or the like can be used.

Further, if necessary, a plasticizer for stabilizing the flexibility and strength of the print film and a solvent for adjusting the viscosity and drying may be added to the vehicle. As the solvent, a low-boiling solvent having a boiling point of about 100 ° C. and a high-boiling petroleum solvent having a boiling point of 250 ° C. or more can be used depending on the printing method. As a solvent having a low boiling point, for example, alkylbenzene or the like can be used.

Further, auxiliary agents such as various reactants for improving drying, viscosity and dispersibility can be appropriately added.
The auxiliary agent is used to adjust the performance of the ink. For example, a compound that improves the friction resistance of the ink surface after drying, a dryer that promotes the drying of the ink, and the like can be used.

A photopolymerization-curable or electron beam-curable resin that does not use a solvent can also be used as a binder resin that is a main component of the vehicle. For example, there is an acrylic resin, and specifically, the followings can be used as those commercially available as acrylic monomers.

Examples of the monofunctional acrylate include 2-ethylhexyl acrylate, 2-ethylhexyl EO adduct acrylate, ethoxydiethylene glycol acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and caprolactone adduct of 2-hydroxyethyl acrylate. Phenoxyethyl acrylate, phenoxydiethylene glycol acrylate, nonylphenol EO adduct acrylate,
Acrylate obtained by adding caprolactone to nonylphenol EO adduct, 2-hydroxy-3-phenoxypropyl acrylate, tetrahydrofurfuryl acrylate, caprolactone adduct of furfuryl alcohol, acryloylmorpholine, dicyclopentenyl acrylate, dicyclopentanyl acrylate, dicyclopentyl acrylate Cyclopentenyloxyethyl acrylate, isobornia acrylate, acrylate of caprolactone adduct of 4,4-dimethyl-1,3-dioxane, acrylate of caprolactone adduct of 3-methyl-5,5-dimethyl-1,3-dioxane, etc. Can be used.

Examples of the polyfunctional acrylate include hexanediol diacrylate, neopentyl glycol diacrylate, polyethylene glycol diacrylate, tripropylene glycol diacrylate, neopentyl glycol hydroxypivalate diacrylate, and neopentyl glycol hydroxypivalate. A caprolactone adduct diacrylate of
Acrylic acid adduct of 1,6-hexanediol diglycidyl ether, diacrylate of acetal compound of hydroxypivalaldehyde and trimethylolpropane, 2,2-bis [4- (acryloyloxydiethoxy) phenyl] propane, 2,2-bis [4- (acryloyloxydiethoxy) phenyl] methane, diacrylate of hydrogenated bisphenol A ethylene oxide adduct, tricyclodecane dimethanol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, Trimethylolpropane propylene oxide adduct triacrylate, glycerin propylene oxide adduct triacrylate, dipentaerythritol hexaacrylate / pentaacrylate mixture, dipenta Lower fatty acid and esters of acrylic acid Risuritoru, acrylate caprolactone adduct of dipentaerythritol, tris (acryloyloxyethyl) isocyanurate, and the like can be used 2-acryloyloxyethyl phosphate.

The inks composed of these resins are solvent-free and have a composition that causes a chain polymerization reaction by irradiation of electromagnetic waves or electron beams. Among them, those of ultraviolet irradiation type require a photopolymerization initiator. A polymerization inhibitor, a chain transfer agent and the like may be added as a sensitizer and an auxiliary depending on the above.

As the photopolymerization initiator, 1) direct photolysis type such as arylalkyl ketone, oxime ketone, acylphosphine oxide, etc. 2) radical polymerization reaction type such as benzophenone derivative and thioxanthone derivative 3) cationic polymerization reaction Examples of the type include an aryldiazonium salt, an aryliodonium salt, an arylsulfonium salt, an arylacetophenone salt, and other types such as 4) an energy transfer type, 5) a photo redox type, and 6) an electron transfer type. . For the electron beam curing type, a resin similar to that of the above-described ultraviolet irradiation type may be used, and a photopolymerization initiator may not be required, and various assistants may be added as needed.

The fluorescent light-emitting ink comprising the above-mentioned fluorescent pigment, vehicle, auxiliary and the like may further contain an irreversible decolorizable colorant. The decolorizable colorant in this case has an absorption characteristic in the visible region before the operation for decoloring, that is, is colored, but the operation for decoloring, for example, irradiation with near infrared rays Is a colorant that has an almost irreversible absorption in the visible region, that is, changes to a state transparent to visible light. When printing is performed using a fluorescent light-emitting ink containing such a decolorizable colorant, a printed image can be identified with the naked eye without performing ultraviolet irradiation, and printing accuracy can be improved. After that, it can be made transparent to visible light by performing a decoloring operation.

A fluorescent image forming layer X (2,
4, 6) can be formed on a substrate by various methods conventionally known, using the above-mentioned fluorescent light-emitting ink. For example, an intaglio printing method such as a relief printing method or a gravure method, a lithographic printing method of an offset method, or a screen stencil (stencil) can be used. In addition, a thermal transfer method (see, for example, JP-A-61-213195, JP-A-59-54598, JP-A-62-111800, and JP-A-3-187786) and an ink-jet method (for example, JP-A-3-81376) (See Japanese Unexamined Patent Publication). Further, Japanese Patent Application Laid-Open No. 4-338
A fluorescent image-forming layer containing a phosphor can also be formed by the method described in JP-A-598-598. When the thermal transfer method is used, it is preferable to secure the amount of light by setting the film thickness of the fluorescent image forming layer to at least 6 μm or more. Therefore, it is preferable to add a binder or wax such as carnauba wax to the image forming layer. Further, since it is preferable that the ink surface is thermally melted, it is preferable to use a thermoplastic resin as a binder resin which is a main component of the vehicle.

The thickness of the fluorescent image forming layer X (2, 4, 6) formed of the fluorescent light-emitting ink can be appropriately determined according to the required fluorescent luminance and the content of the fluorescent substance. For example, it can be 1 to 10 μm. In the present invention, from the viewpoint of ensuring transparency, the phosphor particles having a relatively small particle size are used as described above, but the shortage of the fluorescence emission intensity due to the small particle size is caused by the thickness of the fluorescent image forming layer. Can be compensated for by increasing.

The fluorescent image formed article of this embodiment further has a visible image forming layer 8. The visible image forming layer 8 is formed by sticking a visible image formed product obtained by exposing and developing a silver halide photographic light-sensitive material, and a visible image obtained by providing a printing layer on another substrate by printing or the like. A method of attaching the formed product, a method of directly providing a printed layer on the base 1, and the like can be used.

In the above-mentioned method of sticking a visible image formed product obtained by exposing and developing a silver halide photographic light-sensitive material on a substrate, a conventionally known silver halide photographic light-sensitive material is used. Materials can be used.
In this case, a monochrome photograph or a color photograph may be used, but it is preferable to use a photograph having a small film thickness because the photograph is attached to the fluorescent image formed article of the present embodiment.

In the case where the visible image forming layer 8 is formed by providing a printing layer on the above-mentioned substrate, a conventionally known coloring paint or ink which is generally used is used.
It can be formed by a conventionally known printing method or the like.

The visible image formed on the visible image forming layer 8 formed by the above method and the fluorescent image forming layer X (2, 4,
The fluorescent images formed in 6) are substantially the same image or related images. For example, in printed matter where it is desired to prevent forgery such as a passport, even if the visible image portion is forged, the fluorescent image can be used to verify the identity of the person, and the fluorescent image and the visible image can be compared. By comparing the images, it is possible to know that forgery is being performed. Since the fluorescent image forming layer is substantially transparent to visible light, its existence is hard to be noticed, and it is difficult for a forger to forge the fluorescent image forming layer. It is.

When substantially the same image is used as described above, there is a risk that image data is created based on the visible image to create a fluorescent image and the image is forged. Such risks can be avoided by making the images related. Here, the related image is the relationship between the face photo image from the front of the person and the face photo image from the side,
Alternatively, the present invention is not limited as long as the images are completely unrelated to each other, such as a face photograph image and a seal image of a seal stamp owned by the person.

The fluorescent image forming layer X is formed on the substrate by the above method.
Except for forming (2, 4, 6) and the visible image forming layer 8, the substrate used in the present invention, the visible image forming layers other than the visible image forming layer 8, the intermediate layers 3, 5, 7 and the protective layer 9 are the same. Conventionally known ones can be formed.

In the fluorescent image formed product of the present embodiment,
In order to make it more difficult to visually recognize an image formed as a fluorescent image under visible light, it is also preferable to print a camouflage pattern or a tint block using visible ink as a base print in the fluorescent image forming area. The camouflage pattern is preferably a random pattern as much as possible, and its color is preferably a light color that does not affect the color of the fluorescent light emitted by the phosphor as much as possible.

In addition to the above-described camouflage pattern, a monochromatic or multicolor visible image forming layer may be formed as a base (background) printing layer or the like below or above the fluorescent image forming layer. However, in the fluorescent image forming area, it is preferable that the color constituting the visible image be a light color that does not affect the color of the fluorescent light emitted by the fluorescent substance as much as possible. In particular, when a multicolor visible image is used as the underprint, it is preferable to reduce the difference in reflectance between two or more colors constituting the visible image in the wavelength region of the fluorescent light emitted by the phosphor. For example, it is preferable that the difference in reflectance be within 20%. If the difference in the reflectance between two or more colors constituting the visible image is large, the intensity of the fluorescent light emitted from the phosphor changes greatly according to the image of the underlying printing, and the image constituted by the phosphor is correctly viewed. It becomes difficult.

The visible image forming layer such as the underprinting described above is
It can be formed by a known printing method using a known coloring paint or ink. For example, a coloring paint or ink can be obtained by adding various pigments to a binder according to the color to be colored. As the binder, those exemplified as the resin constituting the vehicle component of the above-mentioned fluorescent light emitting ink for the fluorescent image forming layer can be used. The coloring paint or ink may further include a plasticizer, a stabilizer, a wax, a desiccant, a drying aid, a curing agent,
Thickeners, dispersants, solvents or diluents can be added. As a printing method, a usual printing method such as a gravure method, a roll method, a knife edge method, an offset method, or a transfer method can be used.
When the transfer method is used, it is preferable to smooth the transfer surface by coating a suitable resin in advance and forming a smooth layer in order to improve the adhesiveness of the transfer pattern.

As the intermediate layers 3, 5, and 7 such as between the fluorescent image forming layers 2, 4, and 6, those having high transmittance with respect to visible light are preferable. As the constituent components, those exemplified as the resin constituting the vehicle component of the above-mentioned fluorescent light emitting ink for the fluorescent image forming layer can be used. In particular, a photopolymerization-curing type or an electron beam-curing type which does not use a solvent is preferable. This can be formed using the above-mentioned acrylic monomer. In addition, you may add a solvent and an auxiliary agent as needed.

The intermediate layers 3, 5, and 7 are not particularly limited. However, when an intermediate layer is provided below the fluorescent image forming layer, an ultraviolet absorbing layer having an ultraviolet absorbent substantially fixed thereon is used. It can be. This can be, for example, at least an ultraviolet absorber and a resin. By selecting the ultraviolet absorber from the group consisting of particles having an ultraviolet absorbing ability or a resin having an ultraviolet absorbing functional group, the ultraviolet absorber is substantially It is possible to form a fixed ultraviolet absorbing layer.

As the particulate matter having an ultraviolet absorbing ability,
For example, an ultraviolet absorbing inorganic pigment can be used, and for example, zinc oxide, titanium oxide, and the like can be used.
From the viewpoint that these particles are substantially transparent to visible light and do not substantially migrate to the fluorescent image forming layer, the particle diameter is suitably in the range of 0.1 to 1 μm.

There are also organic UV absorbers, and benzophenone, benzotriazole, acrylate, and salicylate UV absorbers can be used. As the benzophenone-based ultraviolet absorber, for example, 2-hydroxy-4-methoxybenzophenone,
2,2′-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone,
2,4-dihydroxybenzophenone, resorcyol monobenzoate, 2,4-di-t-butylphenyl-
3,5-di-t-butyl-4-hydroxybenzoate, 2-hydroxy-4-n-octylbenzophenone, or the like can be used. Examples of the benzotriazole-based ultraviolet absorber include, for example, 2- (2′-hydroxy-5′-methylphenyl) benzotriazole (Tinuvin P, manufactured by Ciba-Geigy), 2- (2′-hydroxy-3′-t) -Butyl-5'-methylphenyl) -5-
Chlorobenzotriazole (Tinuvin 326, Ciba-Geigy), 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole (Tinuvin 234, Ciba-Geigy)
Etc. can be used. Examples of the acrylate-based ultraviolet absorber include, for example, 2-ethylhexyl-2-
Cyano-3,3-diphenylacrylate, ethyl-2
-Cyano-3, 3-diphenyl acrylate and the like can be used. As the salicylate-based ultraviolet absorber, for example, phenyl salicylate, 4-t-butylphenyl salicylate, p-octylphenyl salicylate and the like can be used.

It is appropriate to select the thickness of the ultraviolet absorbing layer so that the reflectance of ultraviolet light from the ultraviolet absorbing layer becomes substantially "0". For example, when the ultraviolet absorber is emulsion tinuvin and the wavelength of the ultraviolet light of the light source is 2
In the case of 54 nm, the thickness of the ultraviolet absorbing layer is sufficient to be 1 μm or less, for example, suitably in the range of 0.1 to 1 μm.

The above-mentioned ultraviolet absorbing layer can be formed as an excitation light blocking layer on the fluorescent image forming layers 2, 4, and 6. In the region where the excitation light blocking layer is formed, the irradiated ultraviolet light is absorbed by the excitation light blocking layer and cannot reach the fluorescent image forming layer, so that no fluorescent light is emitted. Therefore, by forming a region where the excitation light blocking layer is not formed and a region where the excitation light blocking layer is not formed, it is possible to form a region that does not emit fluorescent light and a region that does not emit fluorescent light, thereby forming a fluorescent image. In this case, a fluorescent image may be formed by forming an excitation light blocking layer formed along a pattern or the like on a fluorescent image layer formed to emit uniform fluorescent light. A fluorescent image may be formed by forming an excitation light blocking layer along another pattern or the like on the fluorescent image layer formed along the pattern.

The protective layer 9 preferably has high transparency to visible light and ultraviolet light, and can be formed by overlamination or overcoating.
The overlaminate can be formed by laminating a transparent film such as polyethylene terephthalate, polyvinyl chloride, polyethylene, or polypropylene by a conventional method.

As the overcoat, those exemplified as the resin constituting the vehicle component of the fluorescent light emitting ink of the fluorescent image forming layer can be used. In particular, a photopolymerization-curing type or an electron beam-curing type which does not use a solvent is preferable.
This can be formed using the above-mentioned acrylic monomer. As described above, additives such as a polymerization initiator are contained, and those additives having high transparency to visible light and ultraviolet light are appropriately selected. Further, an OP layer may be formed on the outermost surface by offset printing of a medium or the like.

Examples of the substrate 1 include plastics such as vinyl chloride, nylon, cellulose diacetate, cellulose triacetate, polystyrene, polyethylene, polypropylene, polyester, polyimide and polycarbonate; metals such as copper and aluminum; paper;
Impregnated paper or the like can be used alone or in combination as a composite. The material can be appropriately selected from the above materials in consideration of physical properties required for the substrate, for example, strength, rigidity, concealing property, light opacity and the like. The thickness of the substrate is usually about 0.005 to 5 mm.

When a white high-quality paper is used as the substrate of the present invention, a fluorescent whitening agent is usually added to the white high-quality paper to increase the whiteness. Then, it emits blue light. Accordingly, when ultraviolet light is applied to visually recognize a fluorescent image by the phosphor contained in the fluorescent image forming layer formed on the paper substrate, the fluorescent whitening agent in the paper substrate also emits fluorescent light, so that the image There is an inconvenience that it is difficult to confirm. Therefore, it is desirable to select a paper substrate to which no fluorescent whitening agent is added or a paper substrate to which the addition amount is as small as possible. Further, as a base print for suppressing the influence of the fluorescent whitening agent, tinuvin (manufactured by Ciba-Geigy Co., Ltd.) is added to a paper base, for example, at 10% by weight.
It is also effective to form a mixed ultraviolet absorbing layer.

Various ultraviolet light sources can be selected depending on the type of the fluorescent substance as the ultraviolet light irradiating means serving as the excitation light for emphasizing the fluorescent image, but ultraviolet light having a wavelength of 365 nm is used. Light emitting black lights are commercially available in small sizes and are easy to use. Further, a germicidal lamp that emits ultraviolet light having a wavelength of 254 nm can be used. In addition, it is preferable to select the type of the phosphor in accordance with the two wavelength ranges because the embodiment of the present invention is easily performed. Table 1 below illustrates the relationship between the phosphor and the wavelength of the excitation light.

[0064]

[Table 1]

As shown in Table 1, depending on the type of the fluorescent substance, the fluorescent substance emits fluorescent light when irradiated with ultraviolet light of 254 nm,
phosphor that does not emit fluorescent light with ultraviolet light of 254 nm,
And phosphors that emit fluorescence when irradiated with both ultraviolet rays at 365 nm. In the present invention, by selecting these phosphors having different wavelengths of excitable ultraviolet light, the phosphors are selected so that the color of the fluorescent image obtained according to the wavelength of the ultraviolet light to be irradiated is different, and the fluorescent image forming layer is formed. It may be formed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0067] The plan view of the fluorescence imaging of Example foregoing embodiment shown in FIG. The present embodiment is an ID card used for identification and the like. In the drawing, a region P of the visible image forming layer is formed on the right side of the ID card C, and a region F of the fluorescent image forming layer is formed on the left side.

FIG. 1 is a cross-sectional view taken along the line AA ′ of the plan view of the fluorescent image formed product of this embodiment shown in FIG. Film thickness 1
On a substrate 1 made of 88 μm PET (polyethylene terephthalate), a fluorescent image forming layer 2 emitting red light, a first intermediate layer 3, a fluorescent image forming layer 4 emitting green light, a second intermediate layer 5,
A fluorescent image forming layer 6 for emitting blue light and a third intermediate layer 7 are formed, are transparent to visible light, emit fluorescent light by ultraviolet irradiation, and form a color image by an additive color mixing method. An image forming layer X is formed. Further, a visible image forming layer 8 is formed on the substrate 1 in another area, and is formed by attaching a color photograph. The protective layer 9 covers the color fluorescent image forming layer X and the visible image forming layer 8.

In the fluorescent image formed article of the present embodiment, the image formed by the fluorescent image forming layer X and the image formed by the visible image forming layer 8 are substantially the same, and the ID card user 3 shows an image of a face photograph of the subject.

According to the fluorescent image formed product of the present embodiment described above, it is possible to verify whether or not the user is himself / herself based on the image of the visible image fluorescent layer 8. The fluorescent image forming layer X
For example, it is possible to verify whether or not the user is a person based on a fluorescent image obtained by irradiating ultraviolet light having a wavelength of 254 nm. Also, by comparing the visible image and the fluorescent image,
It is possible to know whether or not the D card has been forged.

A method for producing the fluorescent image formed article of the present embodiment will be described. First, a printing original plate film is prepared. Image data of each color of R, G, and B is taken in through a color separation filter of R (red), G (green), and B (blue) with a commercially available color scanner from a face photograph to be attached to the ID card of this embodiment. Alternatively, YMC → RGB data created based on the spectral distribution characteristics of three colors of R, G, and B fluorescent light inks that are once captured and printed as Y (yellow), M (magenta), and C (cyan) image data. Based on the conversion table, the Y image data is converted into B image data, the M image data is converted into G image data, and the C image data is converted into R image data. Obtain image data.

Next, the obtained image data of each color of R, G, and B is transferred to an imagesetter to obtain three original RGB films.

Next, on a PET base having a film thickness of 188 μm, predetermined items such as a company name, a name, an age, a logo mark and the like are added to a normal process ink (Y: yellow, M: magenta, C: cyan, K: black). ) Is performed by offset printing.

Next, using the three original RGB films prepared above, a fluorescent ink (R1 (red emission), G1) having the following composition, which is transparent to visible light and emits fluorescence for each color of RGB upon irradiation with ultraviolet light. (Green light emission) and B1 (blue light emission)) to perform offset printing on the PET base. As the intermediate layer, a conventionally known one is used.

[0075]

[Table 2]

[0076]

[Table 3]

[0077]

[Table 4]

Next, as shown in FIG. 2, a face photograph is attached to a predetermined position using an adhesive. Then, a protective film is laminated on the outermost surface to protect the surface.

As described above, the fluorescent image formed product I of the present embodiment is
D cards can be manufactured. The ID card, which is a fluorescent image formed product manufactured as described above, is an ID card that can verify the identity of a person by a color fluorescent image obtained by irradiating ultraviolet light emitted from a face photograph and black light, Under visible light, the presence of the fluorescent image forming layer is difficult to notice, so that forgery is difficult, and the fluorescent image forming product has a high security level.

In this embodiment, the photograph of the face to be attached to the ID card is taken in as data. However, another photograph of the same person, such as a photograph from the front and a photograph from the side, can be used. When the same photograph is used, there is a risk that image data is created based on the photograph attached to the ID card. On the other hand, it is necessary to form another image such as forming a face photograph image from the side as a fluorescent image. In such a case, there is a disadvantage from the aspect of identity verification, which is an original purpose of an ID card, in that it is difficult to identify the identity card. It is necessary to determine what kind of image data is to be formed into a fluorescent image and a visible image based on the identity verification and the importance of security.

In the above description, a face photograph is attached as a visible image forming layer. However, in the case of a method of printing a face photograph image by a printing method such as sublimation transfer, the above-mentioned R is used.
The YMC data obtained during the preparation of the GB original can be used as it is, or can be converted to YMCK data as needed and used for printing.

The fluorescent light-emitting ink and the fluorescent image formed product of the present invention are not limited to the above embodiments. For example, the image formed by the fluorescent image forming layer is not only a face photograph,
Anything other than a face photo, such as a photo, a seal imprint, a character, a picture, or a pattern on a seal may be used. The color of the fluorescent image may be monochromatic or multicolor. The light source of the ultraviolet light is not limited to the black light, but may be any light source that emits the ultraviolet light. However, in that case, it is necessary to check in advance whether the wavelength of the ultraviolet light to be used can sufficiently excite the fluorescent light-emitting ink, and to select a phosphor. In addition, various changes can be made without departing from the spirit of the present invention.

[0083]

According to the present invention, in a printed matter for which forgery such as a passport is desired to be prevented, even if it is forged by replacing a face photograph or reprinting a face photograph image, it can be obtained by irradiation with ultraviolet rays. It is possible to provide a fluorescent image formed product in which the identity of the person can be verified by the fluorescent image or the security image can be confirmed to be a forgery and which has an improved security level of forgery prevention.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a fluorescent image formed product according to an embodiment of the present invention.

FIG. 2 is a plan view of a fluorescent image formed product according to the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Substrate, 2, 4, 6 ... Fluorescent image forming layer, 3, 5, 7 ...
Intermediate layer, 8: visible image forming layer, 9: protective layer.

Claims (7)

[Claims] 1. A fluorescent image forming product having at least one fluorescent image forming layer and at least one visible image forming layer on a substrate, wherein the fluorescent image forming layer has a wavelength in a visible light region when irradiated with ultraviolet light. A fluorescent image-forming product which contains a phosphor which emits fluorescent light of the above, is substantially transparent to visible light, and forms substantially the same image as the image formed by the visible image forming layer. 2. A fluorescent image-forming product having at least one fluorescent image-forming layer and at least one visible image-forming layer on a substrate, wherein the fluorescent image-forming layer has a wavelength in a visible light region by ultraviolet irradiation. A fluorescent image-forming product which contains a phosphor that emits the fluorescent light of the above, is substantially transparent to visible light, and forms an image related to the image formed by the visible image forming layer. 3. The fluorescent image formed product according to claim 1, wherein said visible image forming layer is formed by photography. 4. The fluorescent image formed product according to claim 1, wherein said visible image forming layer is formed by a printing layer. 5. The fluorescent image according to claim 1, wherein said fluorescent image forming layer has three layers of a blue light emitting fluorescent image forming layer, a green light emitting fluorescent image forming layer, and a red light emitting fluorescent image forming layer. Formations. 6. The fluorescent image formed product according to claim 1, wherein said phosphor comprises an oxide or oxyacid salt-based inorganic phosphor. 7. The phosphor according to claim 1, wherein the phosphor is Sr ₃ (PO ₂ ) ₃ Cl: Eu, ZnO: Zn,
Zn ₂ SiO ₄ : Mn, Zn ₂ GeO ₄ : Mn, Y ₂ O ₃ : Eu, Y (P, V) O ₄ : Eu, Y ₂ O
₂ S: Eu, and ZnS: Cu phosphor image-formed product according to claim 6 wherein the inorganic phosphor selected from among (Mn).