JP2004223975A - Antiforgery medium, information displaying medium, antiforgery transfer foil, antiforgery seal and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new antiforgery medium, information displaying medium, antiforgery transfer foil and antiforgery seal which are effective for the improvement of a partial damage of an OVD image due to the difference in levels or in feelings of clearness and for the improvement of "an easy production of a forgery having similar or same effect", utilizing OVD on the market, and those manufacturing methods. <P>SOLUTION: In the antiforgery medium having the OVD on at least part of or the whole surface of a substrate, the OVD has a permeability to light, and the antiforgery medium, information displaying medium, antiforgery transfer foil and antiforgery seal comprise a verifying function layer containing a luminous material emitting visible lights at least under either one external stimulus of ultaviolet rays, infrared rays, electron rays or the like, over the whole surface or at least in part of the OVD under the OVD. The manufacturing method for them is disclosed. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００４９】
以上のように、比較例１では発光が観察されず、比較例２では検証機能層が目立つ構成となってしまう。一方、実施例１で検証機能層の有無が可視光下では判らず、紫外線照射により真偽を判定可能な媒体となった。比較例１および２の手法で偽造されたとしても、その外観あるいは検証機能が異なるため、容易に偽造品と判断可能となる。
【００５０】
【発明の効果】
以上、本発明によれば、ＯＶＤを損なうことなく、かつその存在が目視ではわからないように隠れた検証機能層を付与することが可能である。さらには同一の検証機能を有する偽造品を容易に製造することを不可能とする。
【図面の簡単な説明】
【図１】本発明による偽造防止媒体の一実施例を示す断面図である。
【図２】本発明による偽造防止媒体を形成するための転写箔の一実施例を示す断面図である。
【図３】本発明による偽造防止媒体を形成するためのシールの一実施例を示す断面図である。
【図４】本発明による偽造防止媒体のＯＶＤ効果層の情報パターンを説明する図である。
【図５】本発明による偽造防止媒体のＯＶＤ効果層形成方法の一実施例を説明する拡大図である。
【図６】実施例１に係る偽造防止媒体を説明する断面図である。
【図７】比較例２に係る偽造防止媒体を説明する断面図である。
【符号の説明】
１１・・・基材
１・・・検証機能層
２・・・ＯＶＤ層
２ａ・・・ＯＶＤ形成層
２ｂ・・・ＯＶＤ効果層
２１、３１・・・支持体
２２・・・剥離層
２４、３４・・・接着層
４２・・・情報パターン（ＯＶＤ）
５１・・・金属薄膜部（ＯＶＤ効果層）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to various information display media that require forgery prevention, and is specifically formed on articles that need to be authenticated, such as securities such as gift certificates and credit cards, or packages of branded products and equipment parts. Related to a forgery prevention medium.
[0002]
[Prior art]
In recent years, holograms, diffraction gratings, and thin films with different optical characteristics can be used to express stereoscopic images and special decorative images using light interference as a forgery prevention means. OVD (Optical Variable Device) such as the resulting multilayer thin film has been used. These OVDs require advanced manufacturing techniques, have a unique visual effect, and can be determined at a glance to determine whether they are true or false. Has been used. In recent years, in addition to securities, it has been pasted on software such as sports goods and computer parts, as well as electronic products software. Has also become widely used.
[0003]
As described above, OVD is a forgery prevention means that is difficult to forge and is easy to confirm. However, in practice, there are many cases where a counterfeit product using a similar item cannot be detected. It is very difficult to copy an OVD image exactly in terms of equipment and technology, but if it is a similar image, it is possible to divert it using a commercially available OVD. In order to solve this problem, a configuration has been proposed in which a printing layer made of an ultraviolet light emitting type fluorescent ink is provided between a hologram forming layer and a metal reflection layer as a technique for reliably distinguishing a genuine product from a counterfeit product. (See Patent Document 1)
In this configuration, it is possible to irradiate ultraviolet rays and verify the light emission to reliably determine the authenticity.
[0004]
[Patent Document 1]
JP-A-7-199783 (page 6)
[0005]
[Problems to be solved by the invention]
However, in this configuration, since the fluorescent ink layer is provided on the metal reflective layer, the level difference or the transparency of the fluorescent ink layer is different, so that the OVD image is partially damaged. Further, for example, by appropriately printing using a suitable fluorescent ink on a commercially available OVD having an image similar to the OVD image, a counterfeit product having a seemingly similar feeling or the same (or similar) product It is not always possible to deny that a counterfeit with an effect can be produced.
The present invention has been made in view of the above-mentioned problems of the related art, and has been made to solve the problem that an OVD image is partially damaged due to a step or a difference in transparency. Or an effective and novel anti-counterfeiting medium, information display medium, anti-counterfeiting transfer foil, anti-counterfeiting seal, and a method of manufacturing the same, in order to improve the point that a counterfeit having the same effect is easily produced. That is the task.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, that is, the invention according to claim 1 provides a forgery prevention medium having an OVD on a base material, on at least a part or the entire surface of the base material,
The OVD has a light-transmitting property, and at least under the OVD, a verification functional layer containing a light-emitting material that emits visible light by any external stimulus such as ultraviolet light, infrared light, or electron beam, A forgery prevention medium characterized in that it is provided on the entire surface of the OVD or at least on a part thereof.
[0007]
The invention according to claim 2 is characterized in that the outline of the region in which the OVD is formed is formed in a shape representing at least one of a character, a number, a picture, and the like. It is a forgery prevention medium of the description.
[0008]
Also, in the invention according to claim 3, the OVD has a layer shape and has an OVD effect layer, and the OVD layer has a light transmittance including the OVD effect layer of 5% to 80%. The forgery prevention medium according to claim 1, wherein:
[0009]
The invention according to claim 4 is the forgery prevention medium according to claim 3, wherein the OVD effect layer is made of a metal thin film.
[0010]
In the invention according to claim 5, the OVD effect layer is formed of a plurality of island-shaped discontinuous metal thin films, thereby forming a sea-island shape on the surface on which the OVD effect layer is formed. The forgery prevention medium according to claim 3, wherein
[0011]
In the invention according to claim 6, the island-shaped metal thin film of the OVD effect layer has one minute width, and
6. The forgery prevention according to claim 5, wherein at least one or all of the island-shaped metal thin films have a contour formed in at least one of a character, a numeral, and a picture. Medium.
[0012]
Further, the invention according to claim 7 is characterized in that the OVD effect layer is entirely formed by printing a metallic glossy ink obtained by dispersing a metal powder in an organic polymer resin. 7. A forgery prevention medium according to any one of Items 6 to 6.
[0013]
The invention according to claim 8 is the forgery prevention medium according to any one of claims 3 to 7, wherein a black layer is provided under the OVD effect layer or the verification function layer.
[0014]
The invention according to claim 9 is characterized in that the contour of the area where the verification function layer is formed is formed in at least one of a character, a number, and a pattern. Item 10. A forgery prevention medium according to any one of Items 1 to 8.
[0015]
According to a tenth aspect of the present invention, there is provided the anti-counterfeiting medium according to any one of the first to ninth aspects on a support,
An information display medium, wherein the verification function layer contains at least one luminous body of a phosphor, a phosphor, or a luminous body in a range of 0.5% to 80%. It is.
[0016]
Further, the invention according to claim 11 is a method according to claim 1, wherein the OVD layer and the verification function layer, which are provided in the forgery prevention medium in the preceding stage, are transferred to the base material side. At least has a heat-sensitive adhesive that exhibits adhesiveness by heating,
A forgery-preventing transfer foil characterized in that at least three of the OVD layer, the verification function, and the heat-sensitive adhesive are relatively provided in this order on a support so as to be peelable from the support. is there.
[0017]
According to a twelfth aspect of the present invention, the OVD layer and the verification function layer, which are the pre-stage provided in the anti-counterfeit medium according to any one of the first to ninth aspects, and at least the additional layers provided on the substrate side A pressure-sensitive adhesive exhibiting adhesiveness by pressure is provided, and at least three of the OVD layer, the verification function layer, and the pressure-sensitive adhesive are relatively provided on the support in this order. It is a forgery prevention seal characterized by the following.
[0018]
Further, the invention according to claim 13 is a method for producing a forgery prevention medium having OVD on at least a part or the entire surface of the substrate,
The OVD uses a transparent material so as to have light transmissivity, and at least under the OVD, a light-emitting material that emits visible light by an external stimulus such as ultraviolet light, infrared light, or electron beam. A method for producing a forgery prevention medium, characterized in that the verification function layer contained is formed on the entire surface or at least a part of the OVD.
[0019]
According to a fourteenth aspect of the present invention, the forgery prevention medium according to any one of the first to ninth aspects is provided on a support, and the verification function layer includes a phosphor, a phosphor, or a phosphorescent material. A method for manufacturing an information display medium, characterized in that at least one luminous body is contained in a range of 0.5% to 80%.
[0020]
According to a fifteenth aspect of the present invention, the OVD layer and the verification function layer of the anti-counterfeit medium according to any one of the first to ninth aspects are combined with the OVD layer and the verification function at a stage prior to being provided on the forgery prevention medium. Layer, and a heat-sensitive adhesive that exhibits adhesiveness by at least heating when transferred to the substrate side,
Anti-counterfeiting, characterized in that at least three of the OVD layer, the verifying function, and the heat-sensitive adhesive are provided on a support so that the OVD layer and the verifying function can be peeled off from the support. This is a method for producing a transfer foil.
[0021]
According to a sixteenth aspect of the present invention, the OVD layer and the verification function layer of the anti-counterfeit medium according to any one of the first to ninth aspects are combined with the OVD layer and the verification function at a stage prior to being provided on the forgery prevention medium. Layer, and a pressure-sensitive adhesive exhibiting adhesiveness by at least pressure when provided on the substrate side,
A method for producing a forgery prevention seal, characterized in that at least three of the OVD layer, the verification function layer, and the pressure-sensitive adhesive are relatively arranged in this order on a support.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing an embodiment of a forgery prevention medium according to the present invention. FIGS. 2 and 3 are cross-sectional views of a transfer foil and a sticker which enable easy manufacture of the forgery prevention medium of the present invention. Was.
As shown in the figure, the anti-counterfeit medium according to the present invention has at least the verification function layer 1 and the OVD layer 2 laminated on the base material 11, and the verification function layer 1 is hidden by the OVD layer 2, Although the presence cannot be confirmed visually, the verification function layer 2 emits light when irradiated with an external stimulus (ultraviolet ray, infrared ray or the like) from above, and the presence can be confirmed. The verification function layer 2 may be provided on the entire surface as shown in FIG. 1, but it is also possible to provide information such as arbitrary figures, numbers, characters, etc. partially.
[0023]
Hereinafter, each layer will be described in detail.
As the verification function layer 1, a material in which a light emitting material is dissolved or dispersed in a binder resin made of an organic polymer material is used. Such a luminescent material emits light in the visible region by an external stimulus, and a phosphor, a phosphor, a phosphorescent light which emits light by an external stimulus such as ultraviolet rays, infrared rays, electron beams, X-rays, radiation, electric fields, and chemical reactions. Body and the like. The light emitting material is used by being appropriately added to a binder resin forming the verification function layer 1. It is desirable that the amount is added in the range of 0.5 to 80%. When the addition amount is 0.5% or less, sufficient light emission cannot be obtained, and when the addition amount is 80% or more, the binding force with the binder resin is weakened, and the resistance as a final product is weakened.
[0024]
Next, these light emitting materials will be described in detail.
The phosphor emits light in the vicinity of the visible region due to an external stimulus (excitation), and the phosphor emits a phosphorescent light that continues afterglow for a time (approximately 0.1 sec) or more that can be felt by the eyes after the excitation is stopped. The body. A long afterglow is called a luminous body.
[0025]
Examples of the fluorescent substance include the following.
Ultraviolet light-emitting fluorescent agents are those excited by ultraviolet light, and the peak of the spectrum emitted when returning to an energy level lower than this is in the wavelength range of blue, green, red, etc., and zinc sulfide and alkaline earth metal A high-purity sulfide phosphor is obtained by adding a trace amount of metal (copper, silver, manganese, bismuth, lead, or the like) as an activator in order to further enhance light emission, followed by high-temperature firing. Hue, brightness, and the degree of color decay can be adjusted by the combination of the host crystal and the activator.
[0026]
On the other hand, the infrared-emitting fluorescent agent includes an infrared-visible conversion fluorescent agent that emits visible light when excited by infrared light and a fluorescent agent that emits light with a longer wavelength when excited by infrared light. The former infrared-visible conversion fluorescent agent is a phosphor having a very special excitation mechanism, and excites visible light emission by using a plurality of infrared photons having low energy. There are two types of these luminescence mechanisms, one by multi-step excitation of activator ions and the other by multiple excitations of resonance energy from the sensitizer, each enabling high excitation. The former type is observed in many host crystals using Er ³⁺ or Ho ³⁺ as an activator, and the latter type is a sensitizer Yb ³⁺ that absorbs infrared rays and emits Er ^{3+ at the} luminescent center by multi-step energy transfer. , Tm ³⁺ , Ho ^{3+ and the} like are excited to a high level.
In addition, semiconductor materials having high electron mobility and photoconductivity such as sulfides (ZnS, CdS) and oxysulfides (Y ₂ O ₂ S) as host crystals are used as electron-beam-excited phosphors. It is possible to use.
[0027]
On the other hand, a phosphor (Zn, Cd) S: Ag having high efficiency with respect to radiation such as X-rays and particle beams, and an electroluminescent phosphor that directly converts electric energy into luminescence are also used as examples.
Further, in addition to the above fluorescent materials, organic pigments and dyes such as stilbene, such as diaminostilbenzylsulfonic acid, diaminodiphenyl, imidazole, thiazole, coumarin, naphthalimide, and thiophene are used. May be.
[0028]
Among them, a material that emits ultraviolet light or infrared light is preferable because it is relatively easy to manufacture or obtain a verification device. Further, a light-emitting material that emits fluorescence by ultraviolet light can be obtained at low cost. It is suitable for.
[0029]
The verification function layer 1 to which such a light emitting material is added is formed to a thickness of about 0.1 to 50 μm by a known coating or printing method such as a gravure method or a screen printing method.
[0030]
Next, the OVD layer 2 will be described.
The OVD is an image using light interference, and is a display member that causes a color shift in which the color changes depending on the expression of a stereoscopic image and the viewing angle. Among them, OVDs such as holograms and diffraction gratings include a relief type for recording interference fringes of light as a fine uneven pattern on a plane and a volume type for recording interference fringes in a volume direction. On the other hand, there is a multilayer film system in which thin films of ceramics or metal materials having different optical characteristics are stacked and a color change (color shift) is caused depending on a viewing angle, which is different from a hologram or a diffraction grating.
Among these OVDs, in consideration of mass productivity and cost, a relief hologram (diffraction grating) or a multilayer thin film type is preferable, and these OVDs are generally widely used.
[0031]
For a relief hologram (diffraction grating), a relief master plate having a fine uneven pattern is produced by an optical imaging method, and mass production is performed using a nickel press plate whose pattern is duplicated by an electroplating method. That is, this press plate is heated and pressed against the OVD forming layer 2a to copy the concavo-convex pattern.
[0032]
The OVD forming layer 2a is required to be capable of being molded by a press plate, and the material thereof may be any of a thermoplastic resin, a thermosetting resin, an ultraviolet ray or an electron beam curable resin. Examples include thermoplastic resins such as acrylic resins, epoxy resins, cellulosic resins, and vinyl resins, and urethanes obtained by adding a polyisocyanate as a crosslinking agent to an acrylic polyol or polyester polyol having a reactive hydroxyl group as a crosslinking agent. Resins, thermosetting resins such as melamine resins and phenolic resins, and ultraviolet or electron beam curing resins such as epoxy (meth) acrylic and urethane (meth) acrylates can be used alone or in combination. In addition, materials other than those described above can be used as long as they are known materials capable of forming an OVD image.
[0033]
Examples of these image technologies include a 3D hologram that reproduces a three-dimensional image and an imaging technology such as a grating image that expresses a diffraction grating with minute dots to give a high brightness. Recently, a method of forming minute dots on a diffraction grating in a specific shape such as a star, a method of drawing fine characters called micro characters, which cannot be seen with the naked eye, and faithfully reproducing the color of the subject like a photograph A technique called “changing” to represent a plurality of images that are completely different from each other at different viewing angles, a technique called a blazed grating with high light diffraction efficiency, and a technique called a blazed grating have been developed. Not only the expression method but also any known image expression method can be used.
[0034]
The OVD effect layer 2b is made of a material having a different refractive index from the polymer material forming the relief surface in order to increase the diffraction efficiency of the OVD image. Further, in the forgery prevention medium of the present invention, since it is a medium that gives specific light at the time of verification and observes light emission, it is necessary to provide a material having light transmittance or a structure that partially transmits light. is there.
As a material to be used, a high refractive index material such as TiO ₂ , Si ₂ O ₃ , SiO, Fe ₂ O ₃ , ZnS, which has a different refractive index from that of the OVD forming layer 2 a, or Al, Sn having a higher reflection effect is used , Cr, Ni, Cu, Au and the like.
[0035]
The OVD effect layer 2b may be provided on one surface, but is formed by a pattern having information such as a pattern, a number, and a character as shown in FIG. An anti-counterfeit effect can be provided.
As the method, 1) a method in which a soluble resin is formed in a pattern on the OVD forming layer, a metal thin film is provided, and then the soluble resin and the metal thin film layer in the portion are washed and removed. 2) The metal thin film layer After printing a pattern using an acid- or alkali-resistant resin, the metal thin film is etched with an acid or an alkali. 3) Further, by exposing to light, a resin material that is dissolved or hardly dissolved is applied. After exposing through a patterned mask, unnecessary portions are removed by washing or etching. The above is one example, and the present invention is not limited to these. Any known technique for partially forming a metal thin film can be used as appropriate.
[0036]
On the other hand, the use of a metal thin film for the OVD effect layer 2b is excellent in terms of light reflection effect and hiding the verification function layer, and is a suitable material in the present invention. However, because it is difficult to transmit light,
{Circle around (1)} A thin film that transmits light is provided. Or
{Circle around (2)} As shown in FIG. 5 (metal thin film portion 51), it is necessary to form such a fine sea-island shape and to partially work as to transmit light. Although the degree of light transmission varies depending on the degree of light emission of the verification function layer 1, it is desirable to transmit 5% or more of the light. On the other hand, in order to hide the verification function layer, the transmittance is preferably 80% or less.
These materials can be used alone or in a laminated form, and are formed by a known thin film forming technique such as a vacuum evaporation method and a sputtering method. The thickness of the material varies depending on the reflectivity and light transmittance of the material, but is about 50 to 10,000 °. Is formed.
[0037]
As a method of providing a fine sea-island-like metal thin film, other than the vacuum evaporation method, for example,
1) The above-mentioned method in which a uniform metal thin film is partially removed to leave a part of a metal surface,
2) A method of providing a metallic luster ink in which a metal piece is dispersed in an organic polymer resin in a printing method.
These techniques are suitable for the present invention because they can change the design and the shading (light transmittance) to improve the design. Furthermore, by forming each minute thin film portion shown in FIG. 5 with an information pattern such as a pattern, a figure, a character, and a number which cannot be confirmed with the naked eye, a verification function for confirming with a magnifying glass or the like is provided. Is also possible. In order to enhance the metallic luster, a black layer to which a black dye or a pigment is added so that transmitted light is not scattered can be provided.
[0038]
On the other hand, in the case of using the multilayer thin film method, as described above, the OVD layer is composed of multilayer thin film layers having different optical aptitudes, and is formed as a metal thin film, a ceramic thin film, or a composite thin film formed by combining them. For example, when thin films having different refractive indices are stacked, a thin film having a high refractive index and a thin film having a low refractive index may be combined, or a specific combination may be alternately stacked. By a combination thereof, a desired multilayer thin film can be obtained.
The multilayer thin film layer is made of a material such as ceramics or metal, and is formed by laminating approximately two or more high refractive index materials and a low refractive index material having a refractive index of about 1.5 with a predetermined thickness. Examples of materials used below are given. First, as ceramics, Sb ₂ O ₃ (3.0 = refractive index n: the same applies hereinafter), Fe ₂ O ₃ (2.7), TiO ₂ (2.6), CdS (2.6), CeO ₂ (2.3), ZnS (2.3), PbCl ₂ (2.3), CdO (2.2), Sb ₂ O ₃ (2.0), WO ₃ (2.0), SiO (2. 0), Si ₂ O ₃ (2.5), In ₂ O ₃ (2.0), PbO (2.6), Ta ₂ O ₃ (2.4), ZnO (2.1), ZrO ₂ ( _{2.0), MgO (1.6),} SiO 2 (1.5), MgF 2 (1.4), CeF 3 (1.6), CaF 2 (1.3~1.4), AlF3 ( 1.6), Al ₂ O ₃ (1.6), GaO (1.7), etc., and a thin film of a simple metal or an alloy, for example, Al, Fe, Mg, Zn, Au, Ag, Cr , Ni, Cu, Si and the like. Examples of the organic polymer having a low refractive index include polyethylene (1.51), polypropylene (1.49), polytetrafluoroethylene (1.35), polymethyl methacrylate (1.49), and polystyrene (1. 60). By absorbing at least one of these high-refractive-index materials or metal thin films having a transmittance of 30% to 60% and at least one of low-refractive-index materials and alternately laminating them at a predetermined thickness, absorption of visible light of a specific wavelength is achieved. Or it will show reflection.
In the thin film made of metal, the optical characteristics such as the refractive index change depending on the state of the constituent materials, the forming conditions, and the like. Therefore, in the embodiments of the present invention, values under certain conditions are used.
[0039]
The above materials are appropriately selected based on optical characteristics such as refractive index, reflectance, transmittance, etc., weather resistance, interlayer adhesion, and the like, and are laminated as thin films to form a multilayer thin film. As the formation method, a known method can be used, and the film thickness, the film formation speed, the number of layers, or the optical film thickness (= n · d, n: refractive index, d: film thickness) can be controlled. Formed by a vacuum evaporation method or a sputtering method.
Even in the multilayer thin film method, as described in the examples of the hologram and diffraction grating above, by forming a part with an information pattern such as an arbitrary pattern, figure, character, numeral, etc., it is possible to add information or to use a sea-island structure. It is also possible to provide such a thin film as an information pattern.
[0040]
Next, a description will be given of a transfer foil which allows the forgery prevention medium of the present invention shown in FIG. 2 to be easily manufactured. As shown in the drawing, the transfer foil of the present invention is formed by sequentially laminating a release layer 22, an OVD layer 2, a verification function layer 1, and an adhesive layer 24 on a support 21. If the present transfer foil is used, the forgery prevention body of the present invention can be formed into an arbitrary shape using a hot stamp. That is, after the substrate and the adhesive layer are bonded by heat and pressure, an unnecessary support is peeled off and formed. Therefore, the release layer 22 is a layer that is peeled off from the support 21 and also serves the purpose of protecting the OVD layer thereafter. The bonding layer 24 has a function of bonding to the substrate 11 by heat and pressure. For the support 21, the release layer 22, and the adhesive layer 24, a known method for manufacturing a transfer foil is appropriately used.
[0041]
On the other hand, FIG. 3 illustrates a sticker that makes it possible to easily manufacture the forgery prevention medium of the present invention. As shown in the figure, the OVD layer 2, the verification function layer 3, and an adhesive layer 34 made of a pressure-sensitive adhesive (adhesive) are sequentially laminated on a support 31. In the construction, as the support 31 and the adhesive 34, known materials and techniques used for manufacturing stickers are appropriately used.
In addition, it is also possible to provide a part to be peeled between layers or to make a cut in the sticker so that the sticker is broken when the sticker is peeled.
[0042]
Although one embodiment has been described above, the present invention can be appropriately used depending on the purpose of use, such as coloring each layer or printing on the surface to improve the design. Also, in view of the adhesiveness of each layer, it is also possible to provide an adhesive anchor layer between each layer.
Furthermore, in order to enhance the metallic luster, the adhesive layer may be formed by adding a black dye or a pigment so that transmitted light is not scattered.
[0043]
【Example】
The present invention will be described in detail with reference to specific examples.
[0044]
<Example 1> (see FIG. 5)
As shown in FIG. 5, urethane resin is applied as a OVD effect layer 2a to a support 31 made of a transparent polyethylene terephthalate (PET) film having a thickness of 25 μm by a gravure method at 5 μm as an OVD effect layer 2a, and then an OVD relief pattern is formed by a roll embossing method. Then, a Sn thin film layer (OVD effect layer 2b) having a thickness of 0.05 μm was formed in a sea-island shape using a vacuum evaporation method. Thereafter, as the verification function layer 1, the characters "OK" were printed at a thickness of 3 μm by gravure printing using an acrylic resin to which an ultraviolet fluorescent material that emits visible light when irradiated with ultraviolet light was added.
Next, an acrylic pressure-sensitive adhesive was provided in a thickness of 20 μm by a comma coating method, and release paper was laminated thereon to produce a forgery prevention seal.
[0045]
<Comparative Example 1>
First, a 5 μm urethane resin is applied as a OVD effect layer 2 a to a support 31 made of a transparent polyethylene terephthalate (PET) film having a thickness of 25 μm by a gravure method, and then an OVD relief pattern is formed by a roll embossing method, followed by vacuum evaporation. The Al thin film layer (OVD effect layer 2b) having a thickness of 0.05 μm was provided on one surface by using the method. Thereafter, as the verification function layer 1, the characters "OK" were printed at a thickness of 3 μm by gravure printing using an acrylic resin to which an ultraviolet fluorescent material that emits visible light when irradiated with ultraviolet light was added.
Next, an acrylic pressure-sensitive adhesive was provided in a thickness of 20 μm by a comma coating method, and release paper was laminated thereon to produce a forgery prevention seal.
[0046]
<Comparative Example 2>
As shown in FIG. 6, a 25 μm-thick transparent polyethylene terephthalate (PET) film support is coated with a urethane resin as an OVD effect layer 2a by a gravure method at a thickness of 5 μm on a support 31 made of a PET film, and then an OVD relief pattern is formed by a roll embossing method. An Al thin film layer (OVD effect layer 2b) having a thickness of 0.05 μm was formed on one surface of the Al thin film layer using a vacuum evaporation method. Thereafter, an acrylic pressure-sensitive adhesive was provided in a thickness of 20 μm by a comma coating method, and release paper was laminated thereon to produce a forgery prevention seal. Next, as the verification function layer 1, a letter “OK” was printed with a thickness of 3 μm by using a gravure printing method using an acrylic resin to which an ultraviolet fluorescent material that emits visible light when irradiated with ultraviolet light was added. The anti-counterfeit seal of Example 2 was made,
[0047]
As described above, the obtained forgery prevention seal was attached to a card to prepare a forgery prevention medium of the present invention. These samples were irradiated with ultraviolet light, and the light emission was confirmed. The results and the appearance of the seal under visible light are shown in Table 1.
[0048]
[Table 1]

[0049]
As described above, in Comparative Example 1, no light emission was observed, and in Comparative Example 2, the structure of the verification function layer was conspicuous. On the other hand, in Example 1, the presence or absence of the verification function layer was not recognized under visible light, and the medium became determinable by ultraviolet irradiation. Even if forged by the methods of Comparative Examples 1 and 2, the appearance or the verification function is different, so that it can be easily determined to be a forged product.
[0050]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a hidden verification function layer without impairing OVD and so that its existence cannot be visually recognized. Furthermore, it is impossible to easily manufacture a counterfeit having the same verification function.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of a forgery prevention medium according to the present invention.
FIG. 2 is a sectional view showing one embodiment of a transfer foil for forming a forgery prevention medium according to the present invention.
FIG. 3 is a sectional view showing an embodiment of a seal for forming a forgery prevention medium according to the present invention.
FIG. 4 is a diagram illustrating an information pattern of an OVD effect layer of a forgery prevention medium according to the present invention.
FIG. 5 is an enlarged view illustrating an embodiment of a method for forming an OVD effect layer of a forgery prevention medium according to the present invention.
FIG. 6 is a sectional view illustrating a forgery prevention medium according to the first embodiment.
FIG. 7 is a cross-sectional view illustrating a forgery prevention medium according to Comparative Example 2.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Base material 1 ... Verification function layer 2 ... OVD layer 2a ... OVD formation layer 2b ... OVD effect layers 21, 31 ... Support body 22 ... Release layers 24, 34 ... adhesive layer 42 ... information pattern (OVD)
51 ... metal thin film part (OVD effect layer)

Claims (16)

On a substrate, at least a part of or the entire surface of the substrate, in a forgery prevention medium having OVD,
The OVD has a light-transmitting property, and at least under the OVD, a verification functional layer containing a light-emitting material that emits visible light by any external stimulus such as ultraviolet light, infrared light, or electron beam, An anti-counterfeit medium characterized by being provided on the entire surface or at least part of the OVD. 2. The forgery prevention medium according to claim 1, wherein the outline of the region in which the OVD is formed is formed in a shape representing at least one of a character, a number, a picture, and the like. 3. The OVD layer according to claim 1, wherein the OVD layer has an OVD effect layer, and the OVD layer has a light transmittance of 5% to 80% including the OVD effect layer. The forgery prevention medium according to any of the above. 4. The forgery prevention medium according to claim 3, wherein the OVD effect layer is made of a metal thin film. 4. The method according to claim 3, wherein the OVD effect layer is formed of a plurality of island-shaped discontinuous metal thin films to form a sea-island on the surface on which the OVD effect layer is formed. Anti-counterfeit media described The island-shaped metal thin film of the OVD effect layer has one minute width, and
6. The forgery prevention according to claim 5, wherein at least one or all of the island-shaped metal thin films have a contour formed in at least one of a character, a number, and a pattern. Medium. The anti-counterfeiting method according to any one of claims 3 to 6, wherein the OVD effect layer is formed by printing a metallic glossy ink obtained by dispersing a metal powder in an organic polymer resin as a whole. Medium. 8. The forgery prevention medium according to claim 3, wherein a black layer is provided under the OVD effect layer or under the verification function layer. The outline of the area where the verification function layer is formed is formed in at least one of shapes such as a character, a number, and a picture. Anti-counterfeit media. The anti-counterfeit medium according to any one of claims 1 to 9 is provided on a support, and the verification function layer includes at least one of a phosphor, a phosphor, and a phosphorescent body. , 0.5% to 80%. The OVD layer and the verification function layer, which are provided in the forgery prevention medium according to any one of claims 1 to 9, and a heat-sensitive adhesive exhibiting adhesiveness at least when heated when transferred to the substrate side. Has,
A forgery-preventing transfer foil, characterized in that at least three of the OVD layer, the verification function, and the heat-sensitive adhesive are relatively provided in this order on a support so as to be peelable from the support. The OVD layer and the verification function layer, which are the pre-stage provided on the anti-counterfeit medium according to any one of claims 1 to 9, and a pressure-sensitive adhesive exhibiting adhesiveness at least when pressed when provided on the substrate side. Has,
An anti-counterfeit seal characterized in that at least three of the OVD layer, the verification functional layer, and the pressure-sensitive adhesive are provided in this order on a support. A method for producing a forgery prevention medium having OVD on a substrate, at least on a part or the entire surface of the substrate,
The OVD uses a transparent material so as to have light transmissivity, and at least under the OVD, a light-emitting material that emits visible light by an external stimulus such as ultraviolet light, infrared light, or electron beam. A method for manufacturing a forgery prevention medium, characterized in that the verification function layer contained is formed on the entire surface or at least a part of the OVD. 10. A counterfeiting prevention medium according to claim 1, provided on a support, wherein the verification function layer contains at least one luminescent material of at least one of a phosphor, a phosphor, and a phosphorescent material. A method for producing an information display medium, wherein the content is contained in the range of 5% to 80%. 10. The OVD layer and the verification function layer of the anti-counterfeit medium according to any one of claims 1 to 9, wherein the OVD layer and the verification function layer are transferred to the OVD layer and the verification function layer, and the base material side, which is a pre-stage provided on the anti-counterfeit medium. A heat-sensitive adhesive that exhibits adhesiveness at least when heated,
Anti-counterfeiting, characterized in that at least three of the OVD layer, the verifying function, and the heat-sensitive adhesive are provided on a support so that the OVD layer and the verifying function can be peeled off from the support. Production method of transfer foil. The OVD layer and the verification function layer of the anti-counterfeit medium according to any one of claims 1 to 9, which are provided on the OVD layer and the verification function layer corresponding to a stage before the anti-counterfeit medium is provided, and on the base material side. At the time, at least a pressure-sensitive adhesive exhibiting adhesiveness by pressure,
A method for manufacturing a forgery prevention seal, characterized in that at least three of the OVD layer, the verification functional layer, and the pressure-sensitive adhesive are relatively arranged in this order on a support.

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