JP2008134510A - Hologram seal and optical laminate for preventing forgery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hologram seal which improves perceptivity of a hologram image and which has a high forgery preventing effect. <P>SOLUTION: The hologram seal is constituted by forming a peeling protection layer, a hologram forming layer, a reflective thin film layer and an adhesive layer in order on a base material. The hologram seal which improves perceptivity of the hologram image and further which has the high forgery preventing effect can be provided by using an optical thin film having lamination structure, wherein the reflective thin film layer has a silver alloy thin film layer and a ceramic material is formed on both surfaces or one surface adjoining the silver alloy thin film layer. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hologram seal with improved visibility of a hologram pattern. In addition, the present invention relates to an anti-counterfeit optical laminate having a high anti-counterfeit effect when the hologram seal of the present invention is used.

  Hologram is a technique for reproducing an image three-dimensionally using the interference effect of light. The production of holograms uses advanced manufacturing techniques and can be formed into a foil shape. For example, banknotes, securities, bonds, checks, gift cards, credit cards, ID cards, prepaid cards, passports It is used to prevent counterfeiting, forgery and duplication of various certificates such as licenses and licenses, and high-priced product packages.

  The hologram sticker is a method in which a concavo-convex image is formed on a substrate, and the image emerges due to the light diffraction effect due to the concavo-convex. The hologram seal is usually provided with a reflective thin film layer for making the outline of an image stand out. The effect of the reflective thin film layer clearly raises the outline of the hologram image and improves the visibility, so that not only the anti-counterfeiting effect is enhanced, but also the decorative value contributes to further increase the commercial value.

  The reflective thin film layer can be formed as a single layer using, for example, titanium oxide (see Patent Document 1). However, in this case, the luminous average reflectance is about 27%. If the average luminous reflectance is about 27%, the brightness is not sufficient, so that the hologram image is buried in the surrounding brightness and does not stand out. If the reflectance is low, the hologram image becomes dark, so that not only the visibility is poor and the decorative effect is inferior, but also the original anti-counterfeit effect is not sufficiently exhibited.

JP 2004-358925 A

  The present invention has been made in view of the above problems, and provides an optical laminate having a high anti-counterfeiting effect in addition to improving the visibility of a hologram image on a hologram seal.

The invention according to claim 1 is a hologram seal formed by sequentially forming a peelable protective layer, a hologram forming layer, a reflective thin film layer, and an adhesive layer on a substrate.
The hologram seal is characterized in that the reflective thin film layer is composed of a single layer of a silver alloy thin film layer, or a ceramic material is laminated on both surfaces or one surface of the silver alloy thin film layer.
According to this, when the reflective thin film layer is made of a silver alloy thin film layer, the reflectance is increased, the hologram image is brightened, and the visibility of the image is improved. Furthermore, by providing the ceramic thin film layer on both surfaces or one surface adjacent to the silver alloy thin film layer, it is possible to increase the degree of freedom in controlling the color of reflected light in the reflective thin film layer. The ceramic thin film layer also plays a role of preventing the silver alloy thin film layer from corrosion. As a result, the security of the hologram seal is improved and the decorativeness can be added.

According to a second aspect of the present invention, there is provided a portion in which a pattern made of a curable transparent resin is printed on both surfaces or one surface of the reflective thin film layer, and only the reflective thin film layer is formed, and the reflective thin film layer 2. The hologram seal according to claim 1, comprising a portion where a laminated structure of a curable transparent resin layer is formed.
Since the reflectance and / or color is different between the portion where only the reflective thin film layer is formed and the portion where the laminated structure of the reflective thin film layer and the curable transparent resin layer is formed, the decorativeness is improved. As a result, a further anti-counterfeit effect can be expected.

The invention according to claim 3 is characterized in that the laminated structure of the reflective thin film layer comprises a portion including a printed pattern made of a curable transparent resin and a portion not including a printed pattern made of a curable transparent resin. The hologram seal according to claim 1.
In the laminated structure of the reflective thin film layer, a part having a reflectance and / or a different color is formed by forming a part including a printed pattern with a curable transparent resin and a part not including a printed pattern with a curable transparent resin. Therefore, the decorativeness is improved, and as a result, a further anti-counterfeit effect can be expected.

According to a fourth aspect of the invention, the silver alloy of the silver alloy thin film layer is made of gold, copper, platinum, tin, aluminum, nickel, magnesium, titanium, bismuth, zirconium, neodymium, palladium, zinc, indium, germanium in silver. The holographic seal according to any one of claims 1 to 3, wherein iridium, osmium, ruthenium, rhenium, rhodium, or two or more of these metal elements are contained.
The silver thin film is easily corroded by oxygen, sulfur, halogen, alkali, and the like, and as a result, aggregation, migration, etc. are caused and the appearance is impaired. However, the chemical stability of silver can be improved by including the other metal elements in silver.

A fifth aspect of the present invention is an anti-counterfeit optical laminate using the hologram seal according to any one of the first to fourth aspects.
By using the hologram sticker of the present invention, the visibility of the hologram image can be improved, and in addition, an anti-counterfeit optical laminate having a high anti-counterfeit effect can be provided.

The hologram seal of the present invention can increase the reflectance and improve the visibility by using a silver alloy thin film layer. If the ceramic layer is formed adjacent to the silver alloy thin film layer, the color of the reflected light of the reflective thin film layer can be adjusted. In addition, by forming a curable transparent resin layer on both sides or one side of the reflective thin film layer, or by including a curable transparent resin layer in the reflective thin film, the color can be changed depending on the expected angle of the hologram seal. It is possible to impart an anti-counterfeit effect and decorativeness. By adjusting the film thickness of the curable transparent resin layer, it is possible to adjust the color change due to the prospective angle. By using the hologram seal of the present invention for an optical laminate for preventing counterfeiting, it becomes possible to improve the reliability for security protection.
The hologram seal of the present invention is also useful as a filter provided in an optical article such as a CRT, liquid crystal display device, PDP, window glass, glasses, and goggles.

  The following description will be made with reference to cross-sectional views showing an example of the hologram seal 1 of the present invention. FIG. 1 is a cross-sectional view showing the configuration of a hologram seal 1 having a reflective thin film layer 6 composed of three layers and a hologram optical thin film layer 10 composed of a curable transparent resin layer 5. A peelable protective layer 3 is formed on the substrate 2, a hologram forming layer 4 is formed on the peelable protective layer 3, and a curable transparent resin layer 5 is formed on the hologram forming layer 4. A reflective thin film layer 6 is formed so as to cover the resin layer 5, and an adhesive layer 11 is formed so as to cover the reflective thin film layer 6.

  Examples of the substrate 2 include an inorganic compound molded product and an organic compound molded product. The shape of the molded product is not particularly limited as long as the surface is smooth, and examples thereof include a plate shape and a roll shape. The substrate 2 may be a laminate of an inorganic compound molded product or an organic compound molded product.

  Examples of the inorganic compound molded product include soda lime glass, borosilicate glass, quartz glass, Pyrex (registered trademark) glass, alkali-free glass, lead glass, and the like. Examples of the organic compound molded article include paper, synthetic paper, and plastic. In particular, as plastics, for example, polyester, polyamide, polyimide, polypropylene, polyethylpentene, polyvinyl chloride, polyvinyl acetal, polyurethane, polyethyl methacrylate, polycarbonate, polystyrene, polyethylene sulfide, polyether sulfone, polyolefin, polyarylate, polyether Examples include ether ketone, polyethylene terephthalate, polyethylene naphthalate, and triacetyl cellulose.

  The thickness of the base material 2 is appropriately selected according to the intended use, and is usually 5 to 300 μm. The organic compound molded product may contain known additives such as ultraviolet absorbers, plasticizers, lubricants, colorants, antioxidants, flame retardants and the like.

  The peelable protective layer 3 is an adhesive to the hologram forming layer 4 and the substrate 2, for example, an inorganic / organic compound molding such as paper, plastic, glass, etc. In addition, it adheres more than the adhesive layer 11. Any force may be used as long as the force is weak and stability is provided for the subsequent lamination of the hologram forming layer 4. For example, thermoplastic acrylic resin, polyester resin, chlorinated rubber resin, vinyl chloride-vinyl acetate copolymer resin, cellulose resin, chlorinated polypropylene resin, or organic compounds to which oil silicon, fatty acid amide, zinc stearate, etc. are added It is. Alternatively, an inorganic compound may be used.

  As an example of formation of the peelable protective layer 3, a 1.5 μm thickness is laminated at a drying temperature of 110 ° C. by a gravure printing method using a mixture of acrylic resin, polyester resin, toluene, methyl ethyl ketone, and methyl isobutyl ketone. it can.

  The hologram forming layer 4 is excellent in press workability during embossing, has good adhesion to the peelable protective layer 3, and has excellent adhesion to the curable transparent resin layer 5 and the hologram optical thin film 6. It doesn't matter if it is. For example, polyvinyl chloride resin, polyvinyl acetate resin, acrylic resin, polystyrene resin, polycarbonate resin and other thermoplastic resins, melamine resin, unsaturated polyester resin, epoxy, urethane (meth) acrylate, polyester (meth) acrylate, epoxy ( Thermosetting resins such as (meth) acrylate, polyol (meth) acrylate, melamine (meth) acrylate, and triazine (meth) acrylate, or thermoformable materials having radically polymerizable unsaturated groups can be used. A mixture of these resins and the like, a laminate obtained by laminating and curing two or more types of resins, or a product obtained by bonding two or more types of resins or the like can also be used.

  The relief surface of the hologram forming layer 4 can be formed by a known method such as heating and pressing using a nickel hologram stamper on which a fine uneven pattern is formed. Other techniques such as photolithography may be used as long as a fine uneven relief pattern can be formed on the surface of the hologram forming layer 4.

  A protective layer that prevents corrosion and deterioration of the silver alloy thin film layer 8 may be formed on the relief surface of the hologram forming layer 4 by applying a corrosion inhibitor. As the anticorrosive used in the present invention, any material can be used as long as it has a performance to prevent corrosion of metals.

  Anticorrosive agents include amines and derivatives thereof, those having a pyrrole ring, those having a triazole ring, those having a pyrazole ring, those having a thiazole ring, those having an imidazole ring, those having an indazole ring, copper chelate compounds It is desirable to select at least one of thioureas, thioureas, mercapto group-containing products, naphthalene series, or a mixture thereof.

  As a method of applying the anticorrosive, in addition to wet processes such as spraying, microgravure, screen coating, and dip coating, the film is formed by a vacuum dry process such as vapor deposition, CVD, or plasma polymerization. Can do. The effective range of the anticorrosive component includes not only the case where the component exists on the surface of the portion where the anticorrosive film is formed, but also the case where the component permeates into the interior and also exists at a location other than the surface.

  The curable transparent resin layer 5 is composed of characters and patterns. The printing pattern formed on the curable transparent resin layer 5 can be arbitrarily determined.

  The curable transparent resin layer 5 is transmissive to light in the visible light region, and any material may be used as long as it is cured when formed on the relief surface of the hologram forming layer 4. For example, acrylic resin, epoxy resin, urethane resin, polyester resin, vinyl resin, phthalic acid resin, vinyl butyral resin, phenol resin, polyamide resin, anoregind resin, butynoleated amino aldehyde resin, aminoplast It is desirable to be selected from at least one of resins or a mixture thereof.

  As a method for forming the curable transparent resin layer 5, a conventionally known printing method such as a silk screen printing method, an offset printing method, a gravure printing method, or a coating method can be used.

  The reflective thin film layer 6 shown in FIG. 1 has a three-layer structure in which both surfaces of a silver alloy thin film layer are sandwiched between ceramic materials. From a layer closer to the hologram forming layer, a ceramic thin film layer 7, a silver alloy thin film layer 8, The ceramic thin film layers 9 are laminated in this order.

  The material of the silver alloy thin film layer 8 is mainly composed of silver, and gold, copper, platinum, tin, aluminum, nickel, magnesium, titanium, bismuth, zirconium, neodymium, palladium, zinc, indium, germanium, iridium in silver. , Osmium, ruthenium, rhenium, rhodium added alloy. Two or more of these metal elements may be contained in silver.

  The reason for adding other metal elements to silver is as follows. Silver thin film is easily corroded by oxygen, sulfur, halogen, alkali, etc., and as a result, aggregation, migration, etc. are caused and the appearance is impaired. However, when other metal elements are contained in silver, the chemical stability of silver is reduced. This is because the property is improved. Therefore, when these metal elements are contained in silver, the content thereof may be a level that contributes to corrosion resistance without deteriorating the optical performance of the silver alloy thin film layer 8, and is 0.1 atomic% to 20%. About atomic percent.

  The ceramic layers 7 and 9 not only improve the environmental resistance by protecting the silver alloy thin film layer 8 from external corrosion / deterioration-causing substances, but also contribute to the optical performance of the reflective thin film layer 6. By selecting the structure of the ceramic thin film layer adjacent to the silver alloy thin film layer 8, not only the reflectance of the reflective thin film layer 6 can be adjusted, but also the hue of the optical thin film layer 10 for hologram can be adjusted.

  Specific materials for the ceramic thin film layers 7 and 9 include titanium dioxide (n = 2.3), zirconium dioxide (n = 2.1), zinc sulfide (n = 2.3), cerium dioxide (n = 2). 0.0-2.4), zinc oxide (n = 2.0), tantalum oxide (n = 2.1), indium oxide (n = 2.0), tin oxide (n = 2.0), bismuth oxide (N = 1.9 to 2.4), hafnium oxide (n = 2.0), niobium oxide (n = 2.2), yttrium oxide (n = 1.8), zinc selenium (n = 2. 6), silicon nitride (n = 1.7), magnesium fluoride (n = 1.38), calcium fluoride (n = 1.25), cerium fluoride (n = 1.63), aluminum fluoride ( n = 1.36), silicon dioxide (n = 1.46), aluminum oxide (n = 1.63), oxide oxide It should be selected from at least one of cesium (n = 1.7), lanthanum fluoride (n = 1.6), sodium aluminum fluoride (n = 1.35), and titanium nitride (n = 1.4). Is desirable. Here, n represents a refractive index. On the other hand, the extinction coefficient is desirably zero over the entire wavelength range of visible light.

  The materials of the ceramic thin film layers 7 and 9 are not necessarily the same and can be selected as appropriate. In addition, the number and arrangement order of the silver alloy thin film layers and the ceramic thin film layers are not limited as long as desired characteristics of the optical thin film layer can be obtained. Furthermore, the ceramic thin film layer may not be formed, and the silver alloy thin film layer 8 may be configured as a single layer.

  The ceramic thin film layers 7 and 9 can be formed by a conventionally known method such as an evaporation method, a sputtering method, an ion plating method, an ion beam assist method, a CVD method, or a wet coating method.

  Since the reflective thin film layer 6 has a silver alloy thin film layer, the reflectance increases, the hologram image becomes brighter, and the visibility of the image is improved. Furthermore, by providing the ceramic thin film layer adjacent to the silver alloy thin film layer, it is possible to increase the degree of freedom in controlling the color of reflected light in the reflective thin film layer 6. The ceramic thin film layer also serves to prevent the silver alloy thin film layer from corrosion. As a result, the security of the hologram seal is increased, and the decorativeness can be added.

  Further, regarding the arrangement of the curable transparent resin layer 5 and the reflective thin film layer 6, the curable transparent resin layer 5 is formed on both surfaces or one surface of the reflective thin film layer 6, or in the laminated structure of the reflective thin film layer 6. The curable transparent resin layer 5 can be formed. Further, the curable transparent resin layer 5 may not be formed, and the reflective thin film layer 6 may have a single layer configuration. In the case of the reflective thin film layer 6 single layer, a hologram seal having a high reflectance can be obtained in the entire portion where the reflective thin film layer 6 is formed, so that a bright anti-counterfeit optical laminate is obtained.

  The adhesive layer 11 may be any material as long as it has a stronger adhesive force to the adherend than the peelable protective layer 3 and does not alter, discolor, or deteriorate the reflective thin film layer 6. Examples of the material for the adhesive layer 11 include, but are not limited to, vinyl chloride-vinyl acetate copolymer resin, acrylic adhesive, polyester polyamide, and the like.

  The material of the adhesive layer 11 may contain an anticorrosive agent for preventing corrosion and deterioration of the silver alloy thin film layer 8. As the anticorrosive, the same material as that used in the protective layer can be used.

  As a method for forming the adhesive layer 11, a conventionally known printing method or coating method such as a silk screen printing method, an offset printing method, or a gravure printing method can be used.

  The hologram seal 1 shown in FIG. 1 is used by adhering an adhesive layer 11 to an adherend such as paper, plastic card, glass, and the like, and peeling off the substrate 2 at the interface between the peelable protective layer 3 and the substrate 2. .

  Examples of the present invention will be specifically described below.

<Example 1>
FIG. 2 is a cross-sectional view showing the configuration of the hologram seal 1 having a curable transparent resin layer on one side of the reflective thin film layer. A thermoplastic resin in which a polyester film having a thickness of 12 μm is used as the base material 2 and oil silicon is added to a mixture of acrylic resin, polyester resin, toluene, methyl ethyl ketone, and methyl isobutyl ketone as a peelable protective layer 3 on the base material 2 Was formed by a gravure printing method. The hologram forming layer 4 was formed on the peelable protective layer 3 using a mixture in which an acrylic resin and a vinyl chloride-vinyl acetate copolymer resin were mixed at a weight ratio of 5: 2. A solution obtained by dissolving 2-heptadecylimidazole as a corrosion inhibitor in a methanol solvent was applied to the entire relief surface of the hologram forming layer 4 by a microgravure method to form the protective layer 12.

  A curable transparent resin layer 5 was printed by acrylic screen printing so as to cover a part of the protective layer 12 by silk screen printing to form a physical film thickness of 400 nm. The acrylic contained a solution of 2-heptadecylimidazole in a methanol solvent as an anticorrosive for preventing corrosion of the silver alloy.

Subsequently, a reflective thin film layer 6 having a three-layer structure was formed so as to cover the entire surface of the hologram forming layer 4 and the curable transparent resin layer 5. First, the ceramic thin film layer 7 was formed by depositing zinc sulfide with a physical thickness of 34 nm by a vacuum deposition method using an electron beam. A silver alloy containing 1.5 atomic% of gold and 0.5 atomic% of copper in silver is deposited on the ceramic thin film layer 7 by a sputtering method to form a silver alloy thin film layer 8 having a physical film thickness of 20 nm. Formed. Further, a ceramic thin film layer 9 was formed on the silver alloy thin film layer 8 by depositing zinc sulfide with a physical film thickness of 77 nm by a vacuum vapor deposition method using an electron beam.
FIG. 3 shows a reflection spectrum when the reflective thin film layer 6 is viewed from the front. The luminous average reflectance was as high as 55%. FIG. 4 shows an a * b * chromaticity diagram when the expected angle of the reflective thin film layer 6 is changed from 0 to 90 °.

  FIG. 5 shows a reflection spectrum when the hologram optical thin film layer 10 is viewed from the front when the reflective thin film layer 6 is formed on the curable transparent resin layer 5. The luminous average reflectance was 50%. FIG. 6 shows an a * b * chromaticity diagram when the expected angle of the hologram optical thin film layer 10 is changed from 0 to 90 °. The hologram optical thin film layer 10 changes its color in various ways depending on the angle of expectation due to the light interference effect of the curable transparent resin layer 5, while the reflective thin film layer 6 has little color change due to the angle of expectation.

  A mixture containing vinyl chloride-vinyl acetate polymer, polyester resin, methyl ethyl ketone, toluene, and 2-heptadecyl imidazole as an anticorrosive agent is formed on the reflective thin film layer 6 as an adhesive layer 11 by a gravure printing method. Hologram seal 1 was completed.

  When the hologram seal 1 was viewed from the front, it was confirmed that the outline of the hologram image was conspicuous by the reflected light of the reflective thin film layer 6 and excellent in visibility. In addition, since the color of the optical thin film layer for hologram 10 varied in various ways with the expected angle, it was confirmed that the anti-counterfeiting effect was improved and it was effective for imparting decorativeness.

<Example 2>
FIG. 7 is a cross-sectional view showing the configuration of the hologram seal 1 having a curable transparent resin layer in the laminated structure of the reflective thin film layer. A hologram seal 1 produced in the same manner as in Example 1 was obtained except for the configuration of the optical thin film layer 10 for hologram. The layer structure of the hologram optical thin film layer 10 was produced as follows. First, a ceramic thin film layer 7 was formed by depositing zinc sulfide with a physical thickness of 34 nm by a vacuum deposition method using an electron beam. A silver alloy containing 1.5 atomic% of gold and 0.5 atomic% of copper in silver is deposited on the ceramic thin film layer 7 by a sputtering method to form a silver alloy thin film layer 8 having a physical film thickness of 20 nm. Formed. A curable transparent resin layer 5 was printed with an acrylic film so as to cover a part of the silver alloy thin film layer 8 by a silk screen printing method to form a physical film thickness of 500 nm. Further, a ceramic thin film layer 9 was formed by depositing zinc sulfide with a physical film thickness of 77 nm by vacuum deposition using an electron beam so as to cover the entire surface of the silver alloy thin film layer 8 and the curable transparent resin layer 5.

  FIG. 8 shows a reflection spectrum when the hologram optical thin film 10 is viewed from the front. The luminous average reflectance was 40%. FIG. 9 shows an a * b * chromaticity diagram when the hologram optical thin film 10 is viewed from the front.

  When the hologram seal 1 was viewed from the front, it was confirmed that the outline of the hologram image was conspicuous by the reflected light of the reflective thin film 6 and excellent in visibility. In addition, since the color of the optical thin film layer for hologram 10 varied in various ways with the expected angle, it was confirmed that the anti-counterfeiting effect was improved and it was effective for imparting decorativeness.

<Comparative Example 1>
FIG. 10 is a cross-sectional view showing the configuration of the hologram seal 1 that does not have a curable transparent resin layer and has a single reflective thin film layer configuration. A hologram seal 1 produced in the same manner as in Example 1 was obtained except that the material of the reflective thin film layer 6 was titanium oxide and there was no curable transparent resin layer. The reason why there is no protective layer is that the material of the reflective thin film layer 6 is not a silver alloy, but is titanium oxide that is much more difficult to corrode than silver. The reflective thin film layer 6 was produced as follows. A single-layer reflective thin film layer 6 was formed by depositing titanium oxide with a physical film thickness of 68 nm by a vacuum deposition method using an electron beam.

  FIG. 11 shows a reflection spectrum when the reflective thin film layer 6 is viewed from the front. The luminous average reflectance was a low value of 25%. FIG. 12 shows an a * b * chromaticity diagram when the expected angle of the reflective thin film layer 6 is changed from 0 to 90 °. The reflective thin film layer 6 has low reflectivity and little change in color due to the prospective angle, so the outline of the hologram image was not clear. In addition, the anti-counterfeiting effect and the decorativeness were not sufficient as compared with Examples 1 and 2 because the change in color due to the prospective angle was small.

It is sectional drawing which shows one structural example of the hologram seal | sticker which has the optical thin film for holograms of this invention. It is sectional drawing which shows the structure of the hologram seal in Example 1 of this invention. It is a reflection spectrum figure of the reflective thin film in Example 1 of this invention. It is an a * b * chromaticity diagram of the reflective thin film in Example 1 of this invention. It is a reflection spectrum figure of the optical thin film for holograms in Example 1 of this invention. It is an a * b * chromaticity diagram of the optical thin film for holograms in Example 1 of the present invention. It is sectional drawing which shows the structure of the hologram seal in Example 2 of this invention. It is a reflection spectrum figure of the optical thin film for holograms in Example 2 of the present invention. It is an a * b * chromaticity diagram of the optical thin film for holograms in Example 2 of the present invention. It is sectional drawing which shows the structure of the hologram seal in the comparative example 1 of this invention. It is a reflection spectrum figure of the reflective thin film in the comparative example 1 of this invention. It is an a * b * chromaticity diagram of the reflective thin film in the comparative example 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hologram seal 2 Base material 3 Peelable protective layer 4 Hologram formation layer 5 Curable transparent resin layer 6 Reflective thin film layers 7, 9 Ceramic thin film layer 8 Silver alloy thin film layer 10 Optical thin film layer for hologram 11 Adhesive layer 12 Protective layer

Claims (5)

In the hologram seal formed by forming a peelable protective layer, a hologram forming layer, a reflective thin film layer, and an adhesive layer in this order on the substrate,
A hologram seal, wherein the reflective thin film layer is composed of a single layer of a silver alloy thin film layer, or a ceramic material is laminated on both sides or one side of the silver alloy thin film layer.   The reflective thin film layer is printed with a pattern made of a curable transparent resin on both sides or one side, and only the reflective thin film layer is formed, and the reflective thin film layer and the curable transparent resin layer are laminated. The hologram seal according to claim 1, comprising a portion in which a structure is formed.   The hologram seal according to claim 1, wherein the laminated structure of the reflective thin film layer includes a portion including a printed pattern made of a curable transparent resin and a portion not including a printed pattern made of a curable transparent resin. .   Silver alloy of the silver alloy thin film layer is gold, copper, platinum, tin, aluminum, nickel, magnesium, titanium, bismuth, zirconium, neodymium, palladium, zinc, indium, germanium, iridium, osmium, ruthenium, rhenium in silver The hologram seal according to any one of claims 1 to 3, wherein two or more of rhodium or rhodium are contained.   An optical laminate for preventing counterfeiting using the hologram seal according to claim 1.

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