JP2004209940A - Transfer foil for authenticity judgment body and authentication medium with authenticity judgment body - Google Patents

Abstract

The present invention provides a transfer foil for a true / false judgment body capable of transferring a true / false judgment body having a high forgery prevention effect and excellent security, and an authentication medium with a true / false judgment body.
A transfer foil for authenticity determination body according to the present invention is a transfer foil for transferring an authenticity determination body used for an authentication medium, and is based on a uniform, substantially straight, minute triangular prism-shaped body. The micro prism transfer member 4 made of a transparent resin material is filled on the structure 11 arranged in parallel on the surface of the material 2 so as to fill the recesses between the triangular prisms, and the whole becomes a flat plate. The heat sealing agent 13 is applied on the flat surface. The authentication medium with the authenticity determination body of the present invention is characterized in that the transfer foil 1 is transferred to an authentication medium.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transfer foil for authenticity determination body.
Specifically, when a triangular prism is formed on the surface of the authentication medium, a true / false judgment body in which the appearance state of the authentication medium changes depending on the viewing direction is obtained, but the authenticity judgment body is formed by a transfer method. Transfer foil.
Such transfer foils for authenticity determination bodies are transferred to various kinds of cards such as securities, stock certificates, gift certificates, gift certificates, credit cards, prepaid cards, passports, ID cards, video software, PC software, and the like. Then, it is used for prevention of forgery, authenticity proof use, etc., such as a seal for authenticity 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 genuine / judgment body that does not use a hologram is conceivable. The applicant of the present application has previously proposed a genuine / judgment body composed of a minute triangular prism in Patent Document 1.
Patent Document 2 describes a technique relating to a manufacturing technique of a light diffusion sheet, but describes a technique which can be referred to for manufacturing a transfer foil for authenticity determination body of the present invention.
[0004]
[Patent Document 1] Japanese Patent Application No. 2002-288235 [Patent Document 2] Japanese Patent Application Laid-Open No. 5-169015
[Problems to be solved by the invention]
As described above, the applicant of the present application has proposed a true / false judgment body composed of a small triangular prism. However, the conventional true / false judgment body including the true / false judgment body is formed on a base material surface having a certain thickness. Therefore, there is a danger that the base material may be peeled off and reattached to the imitation product.
Therefore, in the present invention, the present invention has been completed by studying the simple manufacturing of a true / false judgment body having an optical prism function and higher safety.
[0006]
[Means for Solving the Problems]
The first aspect of the present invention for solving the above-mentioned problem is a transfer foil for transferring a true / false judgment object used for an authentication medium, wherein a uniform substantially linear minute triangular prism is formed on a substrate surface. On the structures arranged in parallel on top, a micro prism transfer body made of a transparent resin material is formed so as to fill the recess between the triangular prisms, and so that the whole becomes a flat plate. A transfer foil for authenticity determination body, characterized in that a heat sealant is applied on a flat plate surface.
[0007]
In the above, the material of the micro prism transfer body may be colored and transparent, the cross section orthogonal to the length direction of the micro prism transfer body is a triangle, and the side of the maximum length of the triangle is attached to the authentication medium. In this case, the triangle may be an isosceles triangle or a right-angled isosceles triangle.
In addition, if the height of the micro prism transfer body is in the range of 1 μm to 100 μm, it can be suitably used as a transfer foil for authenticity determination body.
[0008]
The second aspect of the present invention resides in an authentication medium with a genuine / judgement body, wherein the transfer foil for genuine / judgement body is transferred to an authentication medium.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a view showing a manufacturing process of a transfer foil for authenticity determination body of the present invention, and FIG. 2 is a view showing an apparatus for manufacturing a micro triangular prism.
FIG. 3 is a diagram illustrating a state in which the transfer foil for authenticity determination body is transferred to the authentication medium, and FIGS. 4 and 5 are diagrams illustrating a state in which the authentication medium is observed through the micro prism transfer body.
[0010]
The manufacturing process of the transfer foil for authenticity determination body of the present invention will be described based on FIG.
First, as shown in FIG. 1 (A), a structure 11 in which uniform substantially straight triangular prisms 3 are arranged on the surface of a base material 2 is formed. The structure 11 does not become a true / false judgment body, but becomes a so-called mold of a micro prism constituting the true / false judgment body.
Accordingly, the triangular prism 3 itself does not need to have optical characteristics and may be opaque, but it is more advantageous to be transparent when performing the following ultraviolet curing.
The height h of the small triangular prisms 3 from the surface of the base material 2 is preferably about 1 μm to 100 μm for the reason described later.
[0011]
Various methods can be considered for forming the triangular prism 3 on the surface of the base material 2, but generally, it is formed by using a manufacturing apparatus as shown in FIG. 2 and will be described below.
In FIG. 2, reference numeral 20 denotes a roll intaglio in which a concave portion of a triangular prism is formed, 21 denotes a concave portion of the roll intaglio, 22 denotes a coating apparatus for applying an ionizing radiation-curable resin liquid to the roll intaglio, and 23 denotes an ionization plate. A radiation-curable resin liquid, 2 is a sheet substrate, 24 is a solvent drying device, 25 and 26 are curing devices, 27 is a pressing roll that abuts against the roll intaglio and presses the roll intaglio, and 28 is a feed roll.
[0012]
When one side surface of the triangular prism is used as the light scattering layer, the one side surface of the concave portion 21 needs to be a surface which 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. 2, the concave portion 21 for forming the triangular prism is illustrated 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. Be good.
[0013]
The filling step in the triangular prism-shaped body manufacturing process is a step of rotating the roll intaglio 20 on which the mold of the triangular prism is formed, and filling at least the concave portion 21 of the roll intaglio 20 with the ionizing radiation-curable resin liquid 23.
The contact step is a step of bringing the sheet base material 2 running in synchronization with the rotation direction of the roll intaglio 20 into contact with the ionizing radiation-curable resin liquid 23 filled in the filling step.
[0014]
In the curing step, while the sheet substrate 2 is in contact with the roll intaglio 20 in the contacting step, the ionizing radiation curable resin liquid 23 between the roll intaglio 20 and the sheet substrate 2 is applied to the ionizing radiation from the curing device 25. This is a step of irradiating and curing.
The adhesion step is a step of bringing the ionizing radiation-curable resin liquid 23 cured in the curing step into close contact with the sheet substrate 2. Note that the curing step and the adhesion step usually proceed simultaneously. The peeling step is a step of peeling the semi-cured product 23a of the ionizing radiation-curable resin liquid 23 and the sheet substrate 2 adhered in the contacting step from the roll intaglio 20.
[0015]
The roll intaglio 20 is formed by providing a concave portion 21 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. It is preferable that the depth of the concave portion 21 be in the range of 1 μm to 100 μm. This is because the depth becomes the final height of the authenticity determination body and is a range that can be suitably used for the authentication medium.
The coating device 22 is a device for applying the ionizing radiation-curable resin liquid 23 to the roll intaglio 20, 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.
[0016]
The solvent drying device 24 is a device for volatilizing the solvent of the resin. As the solvent drying device 24, warm air, an infrared heater, or the like can be used. By providing the solvent drying device 24, 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 23 is used, the solvent drying device 24 is not used.
[0017]
The curing device 25 is a device that irradiates ionizing radiation to cure the ionizing radiation-curable resin liquid 23. In addition, a curing device 26 may be provided to completely cure the semi-cured product 23a of the ionizing radiation-curable resin liquid 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 rays are used as the curing devices 25 and 26, a light source such as an ultra-high pressure mercury lamp, a black light lamp, a xenon lamp, and a metal halide lamp can be used.
[0018]
<Manufacture of triangular prisms>
In the method for manufacturing a triangular prism using the above-described apparatus, first, the concave portion 21 of the roll intaglio 20 is filled with the ionizing radiation-curable resin liquid 23 by the coating device 22, and the sheet substrate 2 is filled in the concave portion 21 of the roll intaglio 20 The contact is made so as to be in contact with the ionized radiation-curable resin liquid 23 thus caused.
As a method for filling the concave portion 21 with the ionizing radiation-curable resin liquid 23, a predetermined amount of the ionizing radiation-curable resin liquid 23 is applied on the surface of the roll intaglio 20 in advance, and the base sheet 2 is placed on the surface of the roll intaglio 20. Is supplied, the applied ionizing radiation-curable resin liquid 23 is distributed and filled into the concave portions 21 via the base sheet by the pressing of the pressing roll 27.
[0019]
In this case, a solvent-type curable resin can be used, and the ionizing radiation-curable resin liquid 23 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 and the like used in the above are dried and removed by a solvent drying device 24, and the resin liquid obtained by drying the solvent by a curing device 25 is semi-cured.
[0020]
While the sheet substrate 2 is in contact with the roll intaglio 20, the curing device 25 cures the ionizing radiation-curable resin liquid 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.
Alternatively, the roll intaglio 20 may be formed from a material having good transparency of ionizing radiation, such as quartz or glass, and may be irradiated from the inside of the roll intaglio 20.
[0021]
The curing device 25 brings the ionizing radiation-curable resin liquid 23 in the concave portion 21 of the roll intaglio 20 into close contact with the sheet substrate 2. 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 25, the sheet substrate 2 is peeled from the roll intaglio 20. As a result, the semi-cured product 23a of the ionizing radiation-curable resin liquid is integrated with the sheet substrate 2 and detached from the concave portion 21 to obtain the structure 11 having a surface formed into a triangular prism.
[0022]
<Formation of micro prism transfer body>
Next, as shown in FIG. 1B, a transparent resin material is applied to the surface of the structure 11 to form a micro prism transfer body. In this step, since the transparent resin material is filled so as to fill the recesses between the triangular prisms of the structure 11 having the micro triangular prisms formed thereon, no roll intaglio is used. That is, the transparent resin material can be uniformly applied on the structure 11 so as not to generate voids and bubbles, and the excess resin material can be filled by a method of scraping off with a doctor blade.
[0023]
It is preferable that the blade edge of the doctor intersects the parallel lines of the minute triangular prism-shaped structures 11 at a certain angle and rubs them so as not to damage the minute triangular prisms.
After the application of the transparent resin material, the film thickness on the substrate 2 as a whole is in a state of a uniform flat plate having a thickness of 1 to 100 μm. After that, a step of curing the transparent resin material is performed as in the case of the minute triangular prism. The transparent resin material may be colored and transparent such that the authentication medium surface can be clearly seen through the micro prism transfer member 4.
As the transparent resin material, the same ionizing radiation curable resin liquid as in the case of forming the fine triangular prisms can be used, but a solvent-type curable resin may also be used.
[0024]
If the triangular prism of the structure 11 and the filled and cured micro prism transfer member 4 are firmly fixed at the interface, peeling transfer becomes impossible. Therefore, a peelable thin film is previously provided on the interface of the triangular prism. Is preferably formed.
Any material may be used as long as it has different properties from ionizing radiation-curable resins, such as polymethacrylate resin, polyvinyl chloride resin, silicone resin, chlorinated rubber or cellulose resin, casein, various surfactants, and metal oxides. , Etc., or a mixture of two or more thereof can be used.
These dilute solutions can be applied by spray coating, gravure coating or dip coating and drying.
[0025]
Next, as shown in FIG. 1C, a heat sealant 13 is applied to the entire flat plate surface of the micro prism transfer body 4. As the heat sealing agent, various known materials such as polyvinyl chloride-based and polyester-based materials can be used. In some cases, a form in which an adhesive is applied and further protected by protective paper may be used.
It is preferable that the heat sealant and the adhesive are also transparent or translucent. This is so that the display of the authentication medium can be confirmed. The film thickness after coating and drying is 1 to 20 μm, but may be 1 to 3 μm when the object to be transferred is a plastic substrate such as a card.
A gravure coat or a roll coat method can be used for applying the heat sealant or the adhesive.
[0026]
The height of the micro prism transfer member 4 from the substrate surface is preferably about 1 μm to 100 μm. If the thickness is 1 μm or less, a diffraction phenomenon occurs, and no effect appears. If the thickness is 100 μm or more, the thickness becomes too large for a medium to be attached to an authentication medium.
As can be understood from the above steps, since the shape and size of the micro prism transfer body 4 are determined by the micro triangular prism, the shape, height, and the like are determined at the manufacturing stage of the micro triangular prism, particularly the concave portions of the roll intaglio. It is necessary to regulate the shape constantly.
[0027]
Next, a method for using the transfer foil for authenticity determination body of the present invention will be described with reference to FIG. When transferring the authenticity determination body transfer foil 1 to an authentication medium, the transfer foil 1 is transferred to an authentication medium 7 using a transfer mold 6 as shown in FIG.
The transfer mold 6 has a heating element capable of heating the heat sealant to such an extent that the heat sealant is softened, and the heat sealant 13 is softened and adhered to the authentication medium 7 by short-time heating and pressing from the surface of the base material 2.
As shown in FIG. 3 (B), when the transfer foil 1 is peeled off, it peels off from the interface between the minute triangular prism-shaped body 3 and the minute prism transfer body 4, and the authenticity determination body composed of the minute prism transfer body 4 and the heat sealant 13. 10 remains on the authentication medium 7 side. Thereby, the authentication medium 7 becomes the authentication medium with the authenticity judgment body of the present invention.
[0028]
Although the ridge lines on the heat sealant 13 side of the triangular prism-shaped micro prism transfer body 4 are in contact with each other, since there is substantially no connected portion or a thin connected portion between them, a minute It is impossible to separate only the prism transfer body 4 from the authentication medium 7.
In addition, since the heat sealant 13 itself is a fragile layer of a thin film, the triangular prism-shaped micro prism transfer body 4 falls apart and falls off even if it is intentionally peeled off.
Therefore, it is practically impossible to peel off from the base material and retransfer to another imitation product as in the case of the conventional authenticity determination body.
[0029]
Next, the effect of transferring the authenticity determination body transfer foil 1 to the authentication medium 7 will be described. FIGS. 4 and 5 are views showing a state in which the authentication medium is observed through the transferred micro prism transfer body.
In the case of FIG. 4, the cross section of the micro prism transfer body 4 is a right-angled isosceles triangle, and the surface to the right angle, that is, the inclined surface 4 c that is the side of the maximum length is adhered to the authentication medium 7 and the other two surfaces 4 a and 4 b Is designed to face space.
Of the two surfaces facing the space, the one-side common surface 4b for observing the pattern or the like of the authentication medium of each prism may be transparent or may have the light scattering layer 4s formed thereon. The side surface 4a is kept transparent. FIG. 4 illustrates an example in which the light scattering layer 4s is formed on the surface 4b.
In this case, the display 8 and the like on the authentication medium 7 can be visually recognized when viewed from the transparent slope 4a side, but the display becomes cloudy when viewed from the opaque slope 4b side, and the display cannot be viewed. The observer's eyes 5e only see the whole as a cloudy object.
[0030]
FIG. 5 is a diagram showing a state of observing a micro prism transfer body of another embodiment, in which both slopes 4a and 4b are transparent.
In this state, when observing the authentication medium 7 from a direction orthogonal to the surface 4a or a direction orthogonal to the surface 4b, the display 8 or the like of the authentication medium 7 can be observed in any direction. .
However, when the display 8 of the authentication medium 7 is printed with a color material that exhibits different colors depending on the viewing angle, for example, when it is printed with a pearl pigment or a cholesteric liquid crystal pigment ink, if the incident light I from the surface is Since the coloring material has different colors depending on the viewing direction, it can be clearly distinguished from normal display or printing that does not cause such a color change.
[0031]
Although FIGS. 4 and 5 illustrate right-angled isosceles triangles, the apex angle sandwiching the isosceles is not limited to a right angle, and an arbitrary angle in a range of about 60 to 120 degrees can be adopted. . It can be easily conceived that the same effect can be obtained even when the triangle does not have equal two sides.
[0032]
<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 4s is formed at the same time as forming the prism by using only one side surface of the concave portion 21 of the roll intaglio 20 as a mat-shaped processed surface.
[0033]
As described above, since the authenticity determination body of the present invention is formed in a fragile structure that is not supported by the base material, it is extremely difficult to peel the authenticity determination body and retransfer it to the imitation product.
Further, it has a feature that it is possible to switch between a see-through state and a cloudy state depending on the viewing direction of the observer, if necessary, or to provide a display on the authentication medium to make the color tone different.
Since the micro prism transfer body has a triangular prism structure, it is difficult to copy the authentication medium with the authenticity determination body using a copying machine.
Therefore, it is considered that forgery and imitation can be effectively prevented by using such an authenticity determination body as an authentication medium.
[0034]
<Embodiments related to other materials>
(1) Substrate The substrate for the transfer foil is not particularly limited, such as a polymer film, paper, or metal. However, when a uniform thickness 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.
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.
[0035]
(2) Micro triangular prism, micro prism transfer body The material of the micro triangular prism and micro prism transfer body is preferably a resin material from the viewpoint of processability. 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.
[0036]
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.
[0037]
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.
[0038]
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. In order to faithfully reproduce the shape of the roll intaglio 20 having the fine concave portions 21 of the prism, it is preferable that the viscosity be 5000 cps or less, particularly 1000 cps or less. In the case where the prism is colored and transparent, a dye which does not inhibit curing may be added.
[0039]
【Example】
An embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, 4, and 5. FIG.
(Example 1)
On a polyethylene terephthalate film (PET) substrate 2 having a thickness of 100 μm, a transparent urethane acrylate-based ultraviolet curable resin liquid is filled into the recesses 21 and cured using the apparatus shown in FIG. A structure 11 in which minute right-angled isosceles triangular prisms 3 having a height h of 50 μm and a vertical angle cross section of 90 ° are arranged in parallel was formed on the base material 2.
Next, a urethane acrylate-based transparent ultraviolet-curing resin is poured so as to fill the space between the minute right-angled isosceles triangular prisms, and the resin is cured to form the micro prism transfer body 4. It was applied to a thickness of 10 μm to complete the transfer foil 1 for authenticity determination body.
The micro prism transfer body 4 of the transfer foil 1 for authenticity determination body 1 was transferred onto an authentication medium (securities) 7 on which a pattern was printed with pearl pigment ink (FIG. 3).
It was confirmed that the authentication medium exhibited different color tones when observed from the A direction and when observed from the B direction shown in FIG.
[0040]
(Example 2)
On a polyethylene terephthalate film (PET) substrate 2 having a thickness of 100 μm, a transparent urethane acrylate-based ultraviolet curable resin liquid is filled into the recesses 21 and cured using the apparatus shown in FIG. A structure 11 in which minute right-angled isosceles triangular prisms 3 having a height h of 50 μm and a vertical angle cross section of 90 ° are arranged in parallel was formed on the base material 2.
In addition, one surface of the concave portion 21 of the roll intaglio 20 was sand-blasted to form a mat.
[0041]
A solution obtained by diluting a nitrified cotton-based resin with a solvent as a stripping solution is applied to the fine right-angled isosceles triangular prisms 3 and dried, and then a urethane acrylate-based transparent material is filled so as to fill the gaps between the micro-isosceles triangular prisms. After pouring and curing an ultra-violet curable resin to form the micro prism transfer body 4, a polyester heat sealant 13 was applied to the entire surface to a thickness of 2 μm to complete the transfer foil 1 for authenticity determination body.
After transferring the micro prism transfer body 4 of the transfer foil for authenticity determination body 1 to the authentication medium (magnetic card) 7 (FIG. 3), when observing from the direction A shown in FIG. 4, observe the picture of the card. However, when observed from the B direction, the card pattern could not be observed in a cloudy state.
[0042]
As described above, the transfer foil for authenticity determination body of the present invention has been described including the manufacturing process. However, the manufacturing process of the transfer foil is not limited to the above-described process, and can be manufactured.
In particular, it is obvious to those skilled in the art that the structure including the base material and the minute triangular prisms can be manufactured not only by resin molding using a roll intaglio but also by embossing a normal sheet material using an embossing mold. It is.
[0043]
【The invention's effect】
As described above in detail, according to the transfer foil for authenticity determination body of the present invention, an authenticity determination body having a high forgery prevention effect and excellent security can be easily formed on the surface of the authentication medium. Since the authenticity determination body on the surface of the authentication medium is not formed on the surface of the base material, it is damaged even if it is peeled off, so that it is extremely difficult to re-attach it to an imitation product or the like.
Further, the authentication medium of the present invention, onto which the transfer foil for authenticity determination body has been transferred, cannot be normally copied by a copying machine, and forgery and imitation can be highly prevented.
[Brief description of the drawings]
FIG. 1 is a view showing a manufacturing process of a transfer foil for authenticity determination body of the present invention.
FIG. 2 is a view showing an apparatus for manufacturing a minute triangular prism.
FIG. 3 is a diagram illustrating a state in which a transfer foil for authenticity determination body is transferred to an authentication medium.
FIG. 4 is a diagram illustrating a state in which the authentication medium is observed through the transferred micro prism transfer body.
FIG. 5 is a diagram showing a state in which the authentication medium is observed through the transferred micro prism transfer member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transfer foil for authenticity determination body 2 Substrate, sheet base material 3 Micro triangular prism-shaped body 4 Micro prism transfer body 4s Light scattering layer 5e Eye 6 of observer 6 Transfer type 7 Authentication medium 8 Display 10 Authenticity determination body 11 Structure Reference Signs List 13 heat sealant 20 roll intaglio 21 concave portion 22 coating device 23 ionizing radiation curable resin liquid 24 solvent drying device 25, 26 curing device 27 pressing roll 28 feed roll

Claims (6)

A transfer foil for transferring the authenticity determination body used for the authentication medium, wherein a transparent resin is provided on a structure in which uniform substantially linear micro triangular prisms are arranged in parallel on the base material surface. A small prism transfer body made of a material is formed so as to fill the concave portion between the triangular prisms, and is formed so as to be entirely flat, and further coated with a heat sealant on the flat plate surface. Transfer foil for authenticity determination. 2. The transfer foil for authenticity judging body according to claim 1, wherein the material of the micro prism transfer body is colored and transparent. 2. The transfer foil for authenticity judging body according to claim 1, wherein a cross section orthogonal to the length direction of the micro prism transfer body is a triangle, and a side of a maximum length of the triangle is attached to the authentication medium. . 4. The transfer foil for authenticity judging body according to claim 1, wherein the micro prism transfer body is an isosceles triangle or a right-angled isosceles triangle. The transfer foil for authenticity judging body according to any one of claims 1 to 4, wherein the height of the micro prism transfer body is in a range of 1 µm to 100 µm. 6. An authentication medium with a genuine / judgment body, wherein the transfer foil for authenticity judgment body according to claim 1 is transferred to an authentication medium.

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