JP2004178546A - Authenticity determinant unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical authenticity determinant unit highly preventive of forgery and excellent in security terms. <P>SOLUTION: An authenticity determinant unit 1, used as an authentication medium, comprises minute triangular pole shaped prisms 3 made of transparent materials, roughly straight lined on a base material 2 and arranged in parallel. A side of the triangular pole shaped prism 3 is in contact with a surface of the base material. One of the rest two sides facing the ambience is for observing the base material 2 or the authentication medium under the base material and has an unprocessed transparent surface, while the other one has a light reflective layer or a light dispersive layer formed thereon. A cross section of the triangular pole shaped prism 3 may be an isosceles triangle or a right triangle. A prismatic surface may have a character or pattern recorded thereon. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a true / false judgment body.
More specifically, the present invention relates to a genuineness / judgment body having a triangular prism-shaped prism structure on the surface of a base material, wherein when used as an authentication medium, the appearance state of the authentication medium changes depending on the viewing direction.
Such authenticity determination bodies can be used for various kinds of cards such as securities, stock certificates, gift certificates, gift certificates, credit cards, prepaid cards, passports, ID cards, etc., video software, personal computer software, and the like. It is used for anti-counterfeiting, authenticity proof use, etc., such as a seal for judgment.
[0002]
[Prior art]
Conventionally, counterfeiting prevention / authentication judgment such as vouchers such as securities, stock certificates, gift certificates, gift certificates, various cards such as credit cards, prepaid cards, passports, ID cards, etc., authentication seals for video software, personal computer software, etc. Holograms have been widely used in fields requiring the addition of functions because of their excellent design properties and the difficulty of counterfeiting or alteration that cannot be reproduced even in a color copying machine.
However, in recent years, clever counterfeit products have appeared on holograms, and in some cases, it is not possible to determine the authenticity at a glance.
[0003]
Therefore, a medium having optical characteristics as a true / false judgment body that does not use a hologram is conceivable. Patent Document 1 is an optical security article, but the configuration is complicated, and it is considered that the manufactured product is expensive.
Patent Document 2 describes a technology that can refer to the manufacturing of the authenticity determination body of the present invention, although the technology is not related to the authenticity determination body in the light diffusion sheet manufacturing technology.
[0004]
[Patent Document 1] Japanese Patent Publication No. Hei 10-508549
[Patent Document 2] Japanese Patent Application Laid-Open No. 5-169015
[0005]
[Problems to be solved by the invention]
Therefore, in the present invention, the idea of utilizing the optical characteristics of the light diffusion sheet of Patent Document 2 described above to complete a true / false judgment body having a simple configuration having an optical function was conceived, and the present invention was completed. It is a thing.
[0006]
[Means for Solving the Problems]
A first aspect of the present invention to solve the above-mentioned problem is a true / false determination body used for an authentication medium, which is a minute triangular prism having a substantially linear shape on a substrate surface and made of a transparent material. Are arranged in parallel, and one surface of the triangular prism is in contact with the substrate surface, and among the other two surfaces facing the space, observe the authentication medium under the substrate surface or under the substrate surface One of the sides is a transparent surface that is not treated, and the other side is a true / false judgment body characterized in that a light reflecting layer or a light scattering layer is formed.
[0007]
In the above, the cross section orthogonal to the length direction of the triangular prism is an isosceles triangle, and a side that is not an isosceles of the isosceles triangle is directed to the base material, and any one of the other isosceles is The light-reflecting layer or the light-scattering layer can be formed, and the cross section orthogonal to the length direction of the triangular prism is an isosceles triangle, and any of the isosceles of the isosceles triangle is used. Alternatively, one side may face the base material, and the other side of the isosceles triangle may be the light reflecting layer or the light scattering layer.
In these cases, the isosceles triangle may be a right-angled isosceles triangle.
[0008]
Further, the cross section orthogonal to the length direction of the triangular prism may be a right-angled isosceles triangle, and the surface on which the light reflecting layer or the light scattering layer is not formed may be a surface perpendicular to the base material. The material of the triangular prism may be colored and transparent.
[0009]
A second aspect of the present invention for solving the above-mentioned problem is a true / false judgment body used for an authentication medium, which is a small triangular prism having a substantially linear and transparent material on a substrate surface. Are arranged in parallel, one surface of the triangular prism is in contact with the substrate surface, and at least one of the other two surfaces facing the space has character or pattern information. A true / false judgment body characterized by being recorded.
In this case, the information of the character or the pattern may be ink containing a pigment or a dye, or information recorded by selectively applying a metal thin film.
[0010]
A third aspect of the present invention for solving the above-mentioned problem is a true / false determination body used for an authentication medium, which is a small triangular prism having a substantially linear shape on a substrate surface and made of a transparent material. Are arranged in parallel, one surface of the triangular prism is in contact with the substrate surface, and a light reflection layer is formed on at least one surface of the other two surfaces facing the space. A character judging body characterized in that information of characters or patterns is recorded by irradiating the light reflecting layer with laser light.
[0011]
In the above, the cross section orthogonal to the longitudinal direction of the triangular prism is an isosceles triangle, and any one of the isosceles of the isosceles triangle may face the base material. The triangle may be a right-angled isosceles triangle.
[0012]
In any of the authenticity determination bodies described above, the material of the micro triangular prisms can be colored and transparent, and between the triangular prisms arranged in parallel, the maximum side of the triangle is larger than that of the triangle. It may have a flat area with a short interval width. Further, the fact that the height of the triangular prism is in the range of 1 μm to 100 μm from the surface of the base material is an appropriate thickness for the authenticity determination body.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an external perspective view showing a first embodiment of a true / false judgment body of the present invention, FIG. 2 is a view showing a cross section of a triangular prism constituting a true / false judgment body, and FIG. FIG. 4 is a diagram illustrating a state of observing a columnar prism, FIG. 4 is a diagram illustrating a state of observing another triangular prism, and FIG. 5 is a diagram illustrating a modified embodiment of the authenticity determination body.
FIG. 6 is an external perspective view showing a second embodiment of the authenticity judging body of the present invention, and FIG. 7 is an external perspective view showing a third embodiment of the authenticity judging body of the present invention.
[0014]
The first embodiment of the authenticity determination body 1 of the present invention has a configuration in which minute triangular prisms 3 are arranged in parallel on the surface of a substrate 2 as shown in FIG.
The substrate 2 is a substantially flat surface, and generally, a plastic sheet material or a film substrate is used. A pattern or the like may be printed on the prism surface 2a of the substrate 2, but in many cases, the lower surface 2b of the substrate 2 is used after being attached to an authentication medium to be authenticated. Then, it is possible to observe the picture or the like of the authentication medium.
Therefore, although not shown, a pressure-sensitive adhesive layer made of a pressure-sensitive adhesive or a re-wettable or hot-melt type adhesive layer may be formed in contact with the lower side 2b of the base material 2.
[0015]
The micro triangular prism 3 is made of a transparent or colored transparent plastic material, one surface of which faces the surface of the base material 2 and the other two surfaces face a space. Here, “transparent” refers to such transparency that the surface of the base material 2 a can be clearly recognized through the triangular prism 3.
The triangular prisms may be arranged such that ridges on the substrate surface are in contact with each other, or may be arranged so as to have a certain flat area between the ridges as described later with reference to FIG.
[0016]
FIG. 2 is a diagram showing a cross section orthogonal to the length direction of the triangular prism 3, and corresponds to a partially enlarged cross section of the authenticity determination body in FIG. In the case of FIG. 2, the cross section of the prism is a right-angled isosceles triangle, and a surface for a right angle, that is, a slope 3c that is not an isosceles surface faces the base material 2, and the other two surfaces 3a and 3b face a space. I have.
Of the two surfaces facing the space, a light reflecting layer 3m or a light scattering layer 3s is formed on one side common surface 3a for observing a pattern or the like of the authentication medium of each prism, while the other side surface 3b is transparent. Has been left as it is.
The height of the triangular prism 3 from the substrate surface is preferably about 1 μm to 100 μm, and more preferably 5 μm to 25 μm. If it is 1 μm or less, it is difficult to make one of the two surfaces a light reflecting surface or a light scattering surface, and a diffraction phenomenon occurs, and no effect appears. If it is 100 μm or more, the thickness of the medium to be attached to the authentication medium becomes thick. Because it is too much.
[0017]
FIG. 3 is a diagram showing a state of observing the triangular prism of FIG. 2, and FIG. 4 is a diagram showing a state of observing another triangular prism.
In the case of FIG. 3, the hypotenuse 3c of the right-angled isosceles triangle is in contact with the base material 2, and the light reflection layer 3m or the light scattering layer 3s is formed on the surface 3a of the other two surfaces 3a and 3b sandwiching the right angle. ing.
In this state, when the authenticity determination body 1 is observed from a direction (direction A) orthogonal to the surface 3a, in the case of the light reflecting layer 3m, only the reflected light L is visually recognized by the observer's eyes 5e. Appears as specular. When the light-scattering layer 3s is formed on the surface 3a, only the scattered light is visually recognized, so that the observer sees the object as a cloudy object.
[0018]
On the other hand, since the surface 3b is left as a transparent surface that has not been treated, when viewed from a direction (direction B) orthogonal to the surface 3b, the surface 3b appears as a transparent body and the base material 2 of the authenticity determination body When the printed matter on the surface 2a or the base material 2 is transparent and the authentication medium 4 is provided under the printed matter or the base material 2, the picture of the authentication medium 4 can be observed.
[0019]
In the case of FIG. 4, of the two surfaces 3a and 3b sandwiching the right angle of the right-angled isosceles triangle, the surface 3a is in contact with the base material 2, and the light reflecting layer 3m or the light scattering layer 3s is formed on the slope 3c. I have. Therefore, the surface 3 b on which the light reflecting layer or the light scattering layer is not formed is a surface perpendicular to the substrate 2.
In this state, when the authenticity judging body is observed from the direction A, the observer sees the light reflecting layer 3m as a specular body, and the light scattering layer 3s is formed, as in the case of FIG. If it is, it appears as a cloudy object.
[0020]
On the other hand, when observing from a direction (direction C) orthogonal to the base material 2, the light reflecting layer 3m has a mirror surface 3m. ₁ , Surface of substrate 2 or authentication medium 4, mirror surface 3m _Two The eye 5e of the observer recognizes the light reflected by the above, and the pattern or the like of the base material 2 or the authentication medium 4 can be clearly observed. Since light is transmitted also when observing from the B direction, a picture or the like of the authentication medium 4 can be observed.
Although FIGS. 2, 3 and 4 illustrate right-angled isosceles triangles, the apex angle sandwiching the isosceles is not limited to a right angle, but may be any angle within a range of about 60 to 120 degrees. Can be adopted. Also, it can be easily imagined that the same effect can be obtained even when the triangle does not have equal two sides.
[0021]
FIG. 5 shows a modified embodiment of the authenticity determination body. In this embodiment, a flat area 6 is provided between the ridges of the triangular prism 3. The width h of the flat area 6 is preferably smaller than the width of the largest side of the triangular prism 3.
If the width h of the flat area 6 is smaller than the width of the maximum side, a substantially mirror-like state is obtained when viewed from the light reflection layer 3m direction (D direction) side, and the same effect as when there is no flat area. Is obtained.
In addition, when the authentication medium (not shown) on the base material 2 or the lower surface thereof is observed from a direction (direction C) orthogonal to the surface of the base material 2, it becomes easy to visually recognize a picture or the like of the authentication medium.
[0022]
As described above, the authenticity determination body according to the first embodiment of the present invention has a feature that the mirror state (or the cloudy state) and the transparent state (the state where the picture is visible) are switched depending on the viewing direction of the observer. Further, the authenticity determination body having such a configuration requires an advanced manufacturing technique as described below, and has an advantage that it cannot be easily manufactured.
Therefore, it is considered that forgery and imitation can be effectively prevented by using such an authenticity determination body as an authentication medium.
[0023]
The second embodiment of the authenticity determination body 1 is characterized in that information of characters or patterns 8 is recorded on at least one side surface of the small triangular prism 3 as shown in FIG. Other configurations of the authenticity determination body 1 are the same as those of the first embodiment.
The information recording of the character or the pattern 8 is not limited to recording one character for each one prism surface, but may cover a plurality of surfaces. However, since the printing is performed within a small area, it is difficult with a normal printing method.
As a method of forming the character or pattern 8, when forming the light reflecting layer (metal thin film) 3m, a character or pattern mask is provided so that the metal thin film is provided only on the relevant portion, or after forming the entire metal thin film. The pattern such as characters may be left by photoetching. Alternatively, a precision rubber stamp method, an ink jet printing method using a microcapillary, or the like can be employed.
[0024]
In this embodiment, when information is recorded only on one side of the micro triangular prism 3, the character or pattern can be observed from the recording side, but when visually recognized from the other side, the authentication medium on the lower surface can be observed. become.
When information is recorded on both sides of the small triangular prism 3, the characters or patterns from one side and the other side may be different.
[0025]
In the third embodiment of the authenticity determination body 1, as shown in FIG. 7, a light reflecting layer 3m is formed on at least one side surface of the small triangular prism 3, and the surface of the light reflecting layer 3m is irradiated with laser light to write characters. Alternatively, pattern information is recorded.
Various types of laser marking devices are commercially available for recording using laser light, and recording of fine characters (about 0.3 mm × 0.3 mm) and the like is possible.
In the case of the third embodiment, as in the second embodiment, information can be recorded on one side or both sides of the small triangular prism 3, but if the area concealed by the light reflecting layer 3m is large, the lower side may be used. There is a problem that the authentication medium cannot be visually recognized. Therefore, it is better to increase the area of the light reflecting layer to be removed by laser light when recording is performed only on one side surface or when recording is performed on both side surfaces.
The effect of recording by the laser light on the character or pattern 9 is the same as in the second embodiment.
[0026]
In the case of the second and third embodiments, the forgery / falsification prevention effect can be further enhanced by associating the information recorded on the prism surface with the information shown on the authentication medium. For example, it is possible to use such as recording the issue number of the authentication medium, the expiration date, the user name and the photograph of the face on the prism.
Using a laser marking device or the like, the above information can be recorded as different information for each authentication medium.
[0027]
Next, a method of manufacturing the authenticity determination body will be described.
FIG. 8 is a diagram showing a manufacturing process flow of the triangular prism, FIG. 9 is a diagram showing a manufacturing apparatus of the triangular prism, and FIG. 10 is a diagram showing a process of forming a light reflecting layer on the triangular prism.
As shown in FIG. 8, the manufacturing process of the triangular prism has a filling process 21, a contacting process 22, a curing process 23, a contacting process 24, and a peeling process 25.
[0028]
In FIG. 9, reference numeral 10 denotes a roll intaglio in which a concave portion of a triangular prism is formed, 11 denotes a concave portion of the roll intaglio, 12 denotes a coating device for applying an ionizing radiation-curable resin liquid to the roll intaglio 10, and 13 denotes a coating device. An ionizing radiation-curable resin liquid, 2 is a sheet substrate, 14 is a solvent drying device, 15 and 16 are curing devices, 17 is a pressing roll that abuts against the roll intaglio and presses the roll intaglio 10, and 18 is a feed roll. .
[0029]
In the case where one side surface of the triangular prism is the light scattering layer 3s, the one side surface of the concave portion 11 needs to be a surface that is matted into fine irregularities. Such a matted surface can be made into a matted surface by forming a smooth planar concave portion as usual and then sand-milling one side surface of the smooth surface using a mask.
In FIG. 9, the concave portion 11 for forming the triangular prism is shown to be orthogonal to the flow direction of the sheet substrate 2, but may be formed parallel to the flow direction of the sheet substrate 2. Shall be.
[0030]
The filling step 21 in the triangular prism manufacturing process is a step of rotating the roll intaglio 10 on which the mold of the triangular prism is formed, and filling at least the concave portion 11 of the roll intaglio 10 with the ionizing radiation-curable resin liquid 13.
The contacting step 22 is a step of bringing the sheet base material 2 running in synchronization with the rotation direction of the roll intaglio 10 into contact with the ionizing radiation-curable resin liquid 13 filled in the filling step 21.
[0031]
In the curing step 23, while the sheet substrate 2 is in contact with the roll intaglio 10 in the contact step 22, the ionizing radiation-curable resin liquid 13 between the roll intaglio 10 and the sheet substrate 2 This is a step of irradiating with ionizing radiation for curing.
The adhesion step 24 is a step of bringing the ionizing radiation-curable resin liquid 13 cured in the curing step 23 into close contact with the sheet substrate 2. Note that the curing step 23 and the adhesion step 24 usually proceed simultaneously.
The peeling step 25 is a step of peeling the semi-cured product 13a of the ionizing radiation-curable resin liquid 13 and the sheet substrate 2 adhered in the adhesion step 24 from the roll intaglio 10.
[0032]
The roll intaglio 10 is provided with a concave portion 11 having a predetermined shape in a cylindrical plate material. The roll intaglio can be obtained by directly cutting the plate material using a lathe or the like, or can be formed by electroforming.
The coating device 12 is a device for applying the ionizing radiation-curable resin liquid 13 to the roll intaglio 10, and often uses a nozzle coating device. In the nozzle coating device, a nozzle having a predetermined size has a T-die-shaped rectangular or linear discharge port, and the longitudinal direction of the discharge port is installed in a direction orthogonal to the roll intaglio rotation direction, The resin liquid is discharged only to a predetermined width portion of the entire width.
[0033]
The solvent drying device 14 is a device for volatilizing the solvent of the resin. As the solvent drying device 14, warm air, an infrared heater, or the like can be used. By providing the solvent drying device 14, a solvent-type resin can be used, and the range of choice of the resin to be used can be expanded. When the solventless ionizing radiation-curable resin liquid 13 is used, the solvent drying device 14 is not used.
[0034]
The curing device 15 is a device that irradiates ionizing radiation to cure the ionizing radiation-curable resin liquid 13. A curing device 16 may be provided in order to completely cure the semi-cured product 13a of the ionizing radiation-curable resin liquid that has been detached after the peeling step.
Here, the ionizing radiation means an electromagnetic wave or a charged particle beam having an energy quantum capable of polymerizing and cross-linking a molecule, and usually, an ultraviolet ray, an electron beam, or the like is used. When ultraviolet light is used as the curing devices 15 and 16, a light source such as an ultra-high pressure mercury lamp, a black light lamp, a xenon lamp, or a metal halide lamp can be used.
[0035]
<Manufacture of triangular prism>
In the method of manufacturing a triangular prism using the above-described apparatus, first, the concave portion 11 of the roll intaglio 10 is filled with an ionizing radiation-curable resin liquid 13 by a coating device 12 (filling step 21), and the sheet base 2 is rolled into the roll intaglio 10. Is contacted so as to be in contact with the ionizing radiation-curable resin liquid 13 filled in the recess 11 (contact step 22).
As a method for filling the concave portion 11 with the ionizing radiation-curable resin liquid 13, a predetermined amount of the ionizing radiation-curable resin liquid 13 is applied on the surface of the roll intaglio 10 in advance, and the base sheet 2 is placed on the surface of the roll intaglio 10. When supplied to the concave portion 11, the applied ionizing radiation-curable resin liquid 13 is distributed and filled into the concave portions 11 via the base sheet by the pressing of the pressing roll 7.
[0036]
In this case, a solvent-type curable resin can be used, and the ionizing radiation-curable resin liquid 13 applied to the sheet substrate 2 is used to dilute the solvent of the resin liquid in order to control fluidity to some extent. The solvent or the like used in the above is dried and removed by the solvent drying device 14, and the resin liquid obtained by drying the solvent by the curing device 15 is semi-cured.
[0037]
While the sheet substrate 2 is in contact with the roll intaglio 10, the ionizing radiation-curable resin liquid 13 is cured by the curing device 15 (curing step 23). If necessary, a plurality of curing devices can be provided along the rotation direction of the roll intaglio. The multi-stage curing can reduce the distortion of the cured product, the curl of the sheet substrate 2, and the like.
Further, the roll intaglio 10 may be formed of a material having good transparency of ionizing radiation, such as quartz or glass, and may be irradiated from the inside of the roll intaglio 10.
[0038]
The curing device 15 causes the ionizing radiation-curable resin liquid 13 in the recess 11 of the roll intaglio 10 to adhere to the sheet substrate 2 (adhesion step 24). At this time, the degree of curing may be at least such that the fluidity of the resin is lost and the adhesiveness to the sheet substrate 2 is generated.
After passing through the curing device 15, the sheet substrate 2 is peeled from the roll intaglio 10 (peeling step 25). As a result, the semi-cured ionizing radiation-curable resin liquid 13a is integrated with the sheet substrate 2 and is detached from the concave portion 11 to obtain a true / false judgment sheet having a prism-formed surface.
[0039]
<Formation of light reflection layer>
The light reflecting layer can be formed on one surface of the triangular prism by vacuum evaporation, sputtering, ion plating, or the like.
FIG. 10 shows a step of forming a light reflecting layer on a triangular prism, and shows a method by vacuum evaporation. With respect to the prism surface having an angle of 45 degrees with respect to the sheet substrate 2, the authenticity determination body 1 is inclined at 45 degrees with respect to the scattering direction of the vapor deposition metal of the vapor deposition source 7 as shown in FIG. The light reflecting layer 3m can be formed by vapor deposition only on one side surface of the triangular prism.
However, even if the vapor deposition surface is an inclined surface, as shown in FIG. 4, when the surface 3b on the side on which the light reflecting surface is not formed does not face the vapor deposition source, the sheet substrate 2 is set to be orthogonal to the vapor deposition source. It may be arranged in.
In forming the light reflecting layer, aluminum or another reflective metal material described later can be used as a vapor deposition material.
[0040]
<Formation of light scattering layer>
The light-scattering layer is generally coated with a material containing a diffusing material, but it is difficult to apply such a material only to one side of the micro prism. The light scattering layer 3s is formed at the same time as forming the prism by using only one side surface of the concave portion 11 of the roll intaglio 10 as a mat-shaped processed surface.
[0041]
<Information recording of characters or patterns>
Various methods can be employed to record character or pattern information on a minute triangular prism surface. For example, when vapor deposition is performed on the surface of a triangular prism as shown in FIG. 10, a fine character or pattern can be recorded by depositing a pattern mask such as a fine character or pattern close to the triangular prism.
When a precision rubber stamp method or an ink jet printing method using a microcapillary is adopted, characters or patterns are printed with ink containing pigment or dye.
[0042]
<Embodiment related to material>
(1) Substrate
The substrate is not particularly limited, such as a polymer film, paper, and metal, but when transparency is required, a polymer film is preferable from the viewpoint of processability.
As plastics for polymer film materials, polyethylene resin, polypropylene resin, polymethylpentene resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyvinyl alcohol resin, vinyl chloride-vinyl acetate copolymer resin, ethylene-vinyl acetate copolymer resin , Ethylene-vinyl alcohol copolymer resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyethylene naphthalate-isophthalate copolymer resin, polymethyl methacrylate resin, polycarbonate resin, polyarylate resin, polyimide resin, polysulfone resin, acrylic resin, etc. Can be used. Alternatively, a liquid crystal material can be used.
The thickness of the substrate is preferably in the range of about 12 to 200 μm from the viewpoint of ease of processing and the like.
[0043]
When a transparent substrate is used as the substrate, it can be combined with a medium displaying information such as pictures and characters, and the information can be visually recognized when transmitted. When the base material is opaque, the pattern and the like of the authentication medium below the base material cannot be visually recognized, but by providing information such as a pattern and characters on the base material surface by printing or the like, Information can be visually recognized.
[0044]
(2) Triangular prism
The material of the prism body is not particularly limited, but a resin material is preferable from the viewpoint of processability. Further, it is required to be transparent or colored and transparent from the characteristics of the prism.
In the above-described manufacturing method of forming a prism shape with an ultraviolet curable resin, an ultraviolet curable ionizing radiation curable resin liquid is preferably used.
As a specific example of such a resin liquid, a composition in which a prepolymer, an oligomer, and / or a monomer having a polymerizable unsaturated bond or an epoxy group in a molecule is appropriately mixed can be used.
[0045]
As the prepolymer and oligomer, unsaturated polyesters such as a condensate of an unsaturated dicarboxylic acid and a polyhydric alcohol, epoxy resins, polyester methacrylate, polyether methacrylate, polyol methacrylate, methacrylates such as melamine methacrylate, polyester acrylate, epoxy Examples include acrylates such as acrylate, urethane acrylate, polyether acrylate, polyol acrylate, and melamine acrylate.
[0046]
Examples of the monomer include styrene-based monomers such as styrene and α-methylstyrene, acrylates such as methyl acrylate, 2-ethylhexyl acrylate, methoxyethyl acrylate, and butyl acrylate, and methacrylic acid. Methacrylates such as methyl acrylate, ethyl methacrylate, methoxyethyl methacrylate, and methoxymethyl methacrylate; unsaturated substituted amino alcohol esters such as 2- (N, N-diethylamino) ethyl acrylate; acrylamide; methacryl Unsaturated carboxylic acid amides such as amides, polyfunctional compounds such as dipropylene glycol diacrylate, ethylene glycol acrylate, propylene glycol dimethacrylate, diethylene glycol dimethacrylate, vinylpyrrolidone, and / or molecules Polythiol compounds having two or more thiol groups, such as trimethylolpropane trithioglycolate, trimethylolpropane tri thio propylate, pentaerythritol thioglycolate and the like.
[0047]
In particular, when cured by ultraviolet light, the composition of the ionizing radiation-curable resin, as a photopolymerization initiator, acetophenones, benzophenones, Michler benzoyl benzoate, α-amyloxime ester, tetramethyl meuram monosulfide, Thioxanthones and / or n-butylamine, triethylamine, tri-n-butylphosphine, and the like as a photosensitizer can be used as a mixture. Further, in order to faithfully reproduce the shape of the roll intaglio 10 having the fine concave portions 11 of the prism, the viscosity is preferably 5000 cps or less, particularly preferably 1000 cps or less. In the case where the prism is colored and transparent, a dye which does not inhibit curing may be added.
[0048]
(3) Light reflection layer
Materials used for forming the light reflecting layer are aluminum (Al), zinc (Zn), indium (In), gold (Au), silver (Ag), cobalt (Co), tin (Sn), and selenium (Se). , Titanium (Ti), iron (Fe), tellurium (Te), copper (Cu), lead (Pb), nickel (Ni), palladium (Pd), and other simple metals, or alloys thereof. .
[0049]
【Example】
An embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, 4, and 10. FIG.
(Example 1)
As shown in FIG. 1 and FIG. 2, by a method of curing a urethane acrylate-based ultraviolet curable resin liquid on a polyethylene terephthalate film (PET) substrate 2 having a thickness of 100 μm, as shown in FIGS. An isosceles triangular prism 3 was formed. Then, the light reflecting layer 3m was formed only on one side by disposing the substrate 2 at an inclination of 45 degrees with respect to the vapor deposition source 7 and vapor-depositing aluminum (Al) metal by the method shown in FIG. The authenticity determination body 1 was obtained (FIG. 2).
The authenticity determination body 1 could be seen as a specular film when observed from the direction A shown in FIG. 3, and could be visually recognized as a transparent film when observed from the direction B.
[0050]
(Example 2)
As shown in FIG. 4, an isosceles triangular prism 3 having a height of 50 μm and a vertex angle of 90 degrees is formed on a PET film base material 2 having a thickness of 100 μm by a method of curing a urethane acrylate ultraviolet curable resin liquid. did.
After that, the substrate 2 is arranged flat with no inclination with respect to the vapor deposition source 7, and aluminum (Al) metal is vapor-deposited to obtain the authenticity determination body 1 in which the light reflection layer 3m is formed only on one side. (FIG. 4).
The authenticity determination body 1 was seen as a mirror-finished film when viewed from the direction A shown in FIG. 4, and could be visually recognized as a transparent film when viewed from the direction C.
[0051]
(Example 3)
An isosceles triangular prism 3 having a height of 50 μm and a vertex angle of 90 ° was formed on a PET film substrate 2 having a thickness of 100 μm by a method of curing a urethane acrylate-based ultraviolet curable resin liquid.
The concave portion 11 of the roll intaglio 10 had been sand-milled in advance so that only one common side surface facing the space of the triangular prism 3 was matted. Thereby, the authenticity determination body 1 having the light scattering layer 3s on one side as shown in FIG. 3 was obtained.
The authenticity determination body 1 looked like a cloudy film when observed from the direction A shown in FIG. 3, and could be visually recognized as a transparent film when observed from the direction B.
[0052]
(Example 4)
A right angle isosceles triangular prism 3 having a height of 30 μm and a vertex angle of 90 ° was formed on a 50 μm thick PET film substrate 2 by a method of curing a urethane acrylate ultraviolet curable resin liquid.
Thereafter, the substrate 2 is disposed at an inclination of 45 degrees with respect to the vapor deposition source 7 by using the method shown in FIG. By performing vapor deposition through a size of about 3 mm × 3 mm), the authenticity determination body of the second embodiment in which characters were recorded on only one side was obtained (FIG. 6).
When the authenticity determination body 1 was observed from the direction A shown in FIG. 3, the surface on which the fine characters were recorded could be observed, and when observed from the direction B, it could be visually recognized as a transparent film.
[0053]
(Example 5)
On a PET film substrate 2 having a thickness of 50 μm, a right-angled isosceles triangular prism 3 having a height of 50 μm and a vertex angle of 90 ° was formed by a method of curing a urethane acrylate-based ultraviolet curable resin liquid.
Thereafter, by the method shown in FIG. 10, the substrate 2 is disposed at an inclination of 45 degrees with respect to the vapor deposition source 7 and vapor-deposited, so that the authenticity determination body 1 in which the light reflection layer 3 m is formed only on one side is obtained. (FIG. 2).
[0054]
By irradiating with a YAG laser wavelength of 1064 nm, a beam diameter of 50 μm, and an output of 10 W using a laser marking device from a direction orthogonal to the light reflection layer 3 m of the triangular prism 3, the aluminum thin film of the laser light irradiation portion is removed. On the inclined surface of the prism, a fine character “ABC” having a size of 1 mm × 1 mm could be recorded (FIG. 7).
When the authenticity judging body 1 of the second embodiment was observed from the direction A shown in FIG. 3, the surface on which the fine characters were recorded could be observed, and when observed from the direction B, it could be visually recognized as a transparent film.
[0055]
【The invention's effect】
As described above, according to the authenticity determination body of the present invention, the following effects can be obtained.
The authentication medium provided with the authenticity determination body of the first embodiment of the present invention switches between a mirrored state, a cloudy state, or a transparent state in which the authentication medium or the like can be visually recognized depending on the viewing direction, so that an article without such a state change can be used. In contrast, the authenticity can be immediately determined.
The authentication medium provided with the authenticity determination bodies of the second and third embodiments of the present invention can observe a character or a pattern depending on the viewing direction, and thus can immediately confirm the authenticity as compared with an article without such a state change. False can be determined.
In addition, the authentication medium or the like on which the authenticity determination body is stuck cannot be normally copied by the copying machine, and forgery and imitation can be prevented.
Since the manufacture of the authenticity determination body of the present invention is relatively difficult, it is difficult to obtain. In this respect, forgery and imitation can be effectively prevented.
[Brief description of the drawings]
FIG. 1 is an external perspective view showing a first embodiment of a true / false judgment body of the present invention.
FIG. 2 is a diagram illustrating a cross section of a triangular prism in the authenticity determination body.
FIG. 3 is a diagram illustrating a state of observing the triangular prism of FIG. 2;
FIG. 4 is a diagram showing a situation in which another triangular prism is observed.
FIG. 5 is a diagram showing a modified embodiment of the authenticity determination body.
FIG. 6 is an external perspective view showing a second embodiment of the authenticity determination body of the present invention.
FIG. 7 is an external perspective view showing a third embodiment of the authenticity determination body of the present invention.
FIG. 8 is a diagram showing a manufacturing process flow of a triangular prism.
FIG. 9 is a diagram showing an apparatus for manufacturing a triangular prism.
FIG. 10 is a view showing a step of forming a light reflection layer on a triangular prism.
[Explanation of symbols]
1 Authenticator
2 Base material, sheet base material
3 Triangular prism
3m light reflection layer
3s light scattering layer
4 Authentication medium
5e eyes
6 flat area
7 Evaporation source
8 characters or patterns
9 Characters or patterns by laser beam irradiation
10 Roll Intaglio
11 recess
12 Coating equipment
13 Ionizing radiation curable resin liquid
14 Solvent drying equipment
15,16 Curing device
17 Press roll
18 feed roll

Claims (13)

The authenticity determination body used for the authentication medium, in which minute triangular prisms made of a substantially linear and transparent material are arranged in parallel on the base material surface, and one of the triangular prisms is formed. The surface is in contact with the substrate surface, of the other two surfaces facing the space, the substrate surface or the authentication medium under the substrate surface is observed, while the side surface is an untreated transparent surface, A true / false judgment body characterized in that a light reflection layer or a light scattering layer is formed on the other side surface. A cross section orthogonal to the length direction of the triangular prism is an isosceles triangle, and a side that is not an isosceles of the isosceles triangle faces the base material, and one of the other isosceles is a light reflecting layer. 2. The authenticity judging body according to claim 1, wherein the authenticity judging body is a light scattering layer. The cross section orthogonal to the length direction of the triangular prism is an isosceles triangle, and any one of the isosceles of the isosceles triangle faces the base material, and the non-equilateral sides of the isosceles triangle are light. 2. The authenticity judging body according to claim 1, wherein the authenticity judging body is a reflection layer or a light scattering layer. The authenticity judging body according to claim 2 or 3, wherein the isosceles triangle is a right-angled isosceles triangle. The cross section orthogonal to the length direction of the triangular prism is a right-angled isosceles triangle, and the surface on which the light reflecting layer or the light scattering layer is not formed is a surface perpendicular to the base material. The authenticity determination body according to claim 1, wherein The authenticity determination body used for the authentication medium, in which minute triangular prisms made of a substantially linear and transparent material are arranged in parallel on the base material surface, and one of the triangular prisms is formed. A genuineness / judgment body characterized in that the surface is in contact with the substrate surface, and at least one of two other surfaces facing the space has character or pattern information recorded thereon. 7. The authenticity judging body according to claim 6, wherein the information of the character or the pattern is information recorded by selectively applying an ink containing a pigment or a dye or a metal thin film. The authenticity determination body used for the authentication medium, in which minute triangular prisms made of a substantially linear and transparent material are arranged in parallel on the base material surface, and one of the triangular prisms is formed. The surface is in contact with the substrate surface, and a light reflection layer is formed on at least one of the other two surfaces facing the space, and the light reflection layer is irradiated with laser light to form a character or pattern. A true / false judgment body characterized by recording information. 7. A cross section orthogonal to the length direction of the triangular prism is an isosceles triangle, and any one of the isosceles of the isosceles triangle faces the base material. Or the authenticity determination body according to claim 8. The authenticity judging body according to claim 6 or 8, wherein the isosceles triangle is a right-angled isosceles triangle. The authenticity determination body according to any one of claims 1 to 8, wherein the material of the minute triangular prism is colored and transparent. 9. The apparatus according to claim 1, wherein a flat area having an interval width shorter than a maximum side of the triangle is provided between the triangular prisms arranged in parallel. Authenticity body of. The authenticity judging body according to any one of claims 1 to 8, wherein the height of the triangular prism is set in a range of 1 µm to 100 µm from the substrate surface.

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