JP2004340994A - Anti-counterfeit media and anti-counterfeit seal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a forgery prevention medium and a forgery prevention seal, which emphasize the color shift effect resulting from viewing angles of a iridescent multi-layer film constituted of two or more kinds of plastic films laminated in multi layers, allow easy visual authenticity decision, and make illicit actions, such as forgery, alternation and falsification difficult. <P>SOLUTION: The forgery prevention medium 1 is so constituted that a light absorbing layer 4 is provided, as at least one pattern, on a part of the rear face of the iridescent multi-layer film 3 constituted of two or more kinds of thin films alternately laminated, and a metal deposited layer 5 is provided almost all over the iridescent multi-layer film including the pattern of the light absorbing layer 4. The forgery prevention seal 2 is obtained by providing an adhesive layer on the metal deposited layer 5 of the forgery prevention medium 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an anti-counterfeit medium made of an iris multilayer film that changes its reflection color in accordance with a change in viewing angle (viewing angle), and an anti-counterfeit seal using the anti-counterfeit medium. The present invention relates to a forgery prevention medium and a forgery prevention seal that make it easy to determine the forgery, and make forgery, falsification, or alteration difficult.
[0002]
[Prior art]
Conventionally, countermeasures to prevent counterfeiting have made it difficult to imitate the article itself, or by attaching an object that is difficult to imitate to the article as proof of authenticity, to distinguish the genuine article from the fake article. There's something you can do. In the former, the ink used for printing is a special ink such as an optically variable ink (OVI; optically variable ink), and in the latter, a relief hologram, a diffraction grating, a Lippman, which is frequently used in recent years, is used. There are holograms such as type holograms.
Among them, for example, in the optically variable ink, the metal thin film laminated by the optically variable material used causes a color change depending on the viewing angle, causing a unique color shift (color change of reflected light), and determining whether or not the state exists. In some cases, it is possible to easily determine whether or not the device is genuine by checking (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 10-222204 (page 3, FIG. 1)
[0004]
However, the anti-counterfeit medium using the above-mentioned optically variable ink is cheaper than a hologram because it can be manufactured by a known printing method such as a screen printing method, but is generally used in printing such as a screen printing method, an offset printing method, and a gravure printing method. The optically variable ink itself is more expensive than printing inks that are commonly used, and is actually used only for a part of the pattern picture or character of the forgery prevention medium.
Further, as a material having the same effect of color shift (color change of reflected light) depending on the viewing angle as a hologram, there is a multilayer thin film layer in which thin films of ceramics, metal, or the like having different optical characteristics are laminated on a base material ( For example, see Patent Document 2.)
[0005]
[Patent Document 2]
JP-A-7-146650
These are based on the optical properties of thin films and the interference effect of light obtained by film thickness, and have the property of reflecting and transmitting in a specific wavelength range, and the properties of reflection and transmission change depending on the viewing angle. Since the visible colors are different, it can be easily determined whether or not it is a genuine article by checking the presence or absence of the state.
[0007]
The color change (color change of the reflected light) due to the viewing angle makes it possible to judge the authenticity of a forged product, and it is impossible to reproduce the optical characteristics of an illegal copy by a color copier. Forgery or forgery is difficult, and even if forged or forged, it has the effect of giving up its use.
[0008]
The form is, as an example, a medium, a seal, or a transfer foil, as a transfer sheet, a thin film of ceramics or metal on a base material, a multilayer thin film layer formed by laminating those having different optical properties, and these are adhered, or In some cases, transfer is applied to a desired article. In addition, as a medium having a higher anti-counterfeit effect, a resin layer is laminated on a metal vapor deposition layer, and a hologram is formed by embossing the resin layer. It is configured to be difficult to reproduce after peeling, and once pasted, peeling this will destroy part or the whole of the hologram, so that not only forgery but also tampering and other manipulations are made to the article. In some cases, it is possible to determine at a glance what has happened.
[0009]
However, it is difficult to stably produce a multilayer thin film layer in which thin films of ceramics and metals, having different optical properties, are laminated on a base material. There is a problem of high cost.
Further, in the case of a hologram, there is a problem that as the forgery prevention effect is increased, the manufacturing process becomes more complicated and the cost increases.
Furthermore, the iris multilayer film that has the same color shift effect by laminating two or more types of plastic films in multiple layers and stretching them under certain conditions is not a thin film such as ceramics or metal as the material of the multilayer film. There is a problem that the color shift effect is not easily understood by the transmitted light from the back surface when used alone.
[0010]
[Problem to solve the problem]
The present invention has been made to solve the problems of the conventional technology, and the subject thereof is that not a thin film such as a ceramic or a metal as a material of a multilayer film, but two or more types of plastic films are laminated in a multi-layered manner. By stretching under the conditions described above, the color shift effect due to the viewing angle of the iris multilayer film having the same color shift effect is emphasized, various colors can be seen on one side, and it is easy to visually determine the authenticity An object of the present invention is to provide an anti-counterfeiting medium and an anti-counterfeiting seal, which are difficult to perform forgery, alteration, or tampering, at low cost.
[0011]
[Means for Solving the Problems]
In order to achieve the above object in the present invention, first, in the invention of claim 1, a light absorbing layer is provided on a part of the back surface of an iris multilayer film in which two or more kinds of thin films are alternately laminated. A forgery prevention medium characterized in that at least one pattern is provided, and a metal deposition layer is provided on substantially the entire surface of the iris multilayer film including the pattern of the light absorbing layer.
[0012]
According to a second aspect of the present invention, there is provided a forgery prevention seal characterized in that an adhesive layer is provided on the metal deposition layer surface of the forgery prevention medium according to the first aspect.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
FIG. 1 is a top view showing an example of the forgery prevention medium of the present invention, FIG. 2 is a cross-sectional view of the forgery prevention medium of FIG. 1 taken along the line XX, and FIG. FIG. 4 is a top view showing an example of a forgery prevention seal provided with a layer, and FIG. 4 is a cross-sectional view of the forgery prevention seal taken along line YY of FIG.
[0015]
The anti-counterfeit medium of the invention according to claim 1 is, for example, as shown in FIG. 2, with the iris multilayer film 3 as a base material, and a light absorption layer 4 laminated on a part of the back surface of the iris multilayer film 3; Further, a metal deposition layer 5 is further laminated on the entire back surface of the iris multilayer film 3 so as to cover the light absorbing layer 4.
[0016]
The forgery prevention seal of the invention according to claim 2 is, for example, as shown in FIG. 4, a light absorbing layer 4 is laminated on a part of the back surface of the iris multilayer film with the iris multilayer film 3 as a base material, The adhesive layer 6 is laminated on the surface of the metal evaporation layer 5 of the forgery prevention medium, on which the metal evaporation layer 5 is laminated on the entire back surface of the iris multilayer film 3 so as to cover the light absorbing layer 4. is there.
[0017]
The iris multilayer film 3 is obtained by alternately laminating two or more polymers having different refractive indexes. Examples of the polymer used as the laminate material include PEN (1.63 = refractive index n: the same applies hereinafter), PC (1.59), PSt (1.59), PET (1.58), and the like as high refractive index polymers. There are also low refractive index polymers such as Ny (1.53), PMMA (1.49), polymethylpentene (1.46), and fluorine-based PMMA (1.4). Among these polymers, at least one selected from high-refractive-index materials and at least one selected from low-refractive-index materials are alternately laminated with a predetermined thickness to exhibit absorption or reflection at a specific wavelength in visible light. is there.
[0018]
The light absorbing layer 4 is provided to further enhance the optical characteristics of the iris multilayer film 3 as shown in FIG. 2, and the iris multilayer film 3 is formed by a film thickness of a polymer laminated in multiple layers. Although it has the property of reflecting a specific wavelength (reflected light 9 and 12 in FIG. 2) and absorbing other wavelengths (absorption wavelengths 10 and 13 in FIG. 2) at the interlayer 7, it has various other properties. The incident light at an angle is also absorbed by the light absorbing layer 4 similarly to the absorption wavelengths 10 and 13, so that the reflection wavelengths 9 and 12 can be seen more clearly.
[0019]
In addition, since the angles of the incident light of the reflected light 9 and the reflected light 12 are different from those of the incident light 8 and the incident light 11, the reflected wavelengths are also different. As a result, the reflected light 9 and the reflected light 12 are different. As described above, the colors that can be seen are different between the viewing angle A and the viewing angle B, and a color shift effect can be obtained.
[0020]
The light absorbing layer 4 is not particularly limited as long as it has a color that can absorb the absorption wavelengths 10 and 13 absorbed by the iris multilayer film 3. In general, a dark color is used, and a black color is further used. Commonly used.
[0021]
Further, as shown in FIG. 2, the metal deposition layer 5 is provided to reduce the color shift effect of the portion 20 where the light absorbing layer 4 is not provided. This is because the metal vapor deposition layer 5 is directly laminated on the iris multilayer film 3, and when this portion is viewed from the surface, the specific wavelength (reflected light 15, reflected light 15, 17), a wavelength (reflected light 18) which is absorbed by the iris multilayer film 3 from the incident light 16 at another angle and reflected by the metal deposition layer 5 is also added. Become.
Therefore, when the portion (20) without the light absorption layer 4 is viewed from the surface, the color shift effect is not seen, and the color shift effect is obtained only in the portion 19 of the iris film 3 where the light absorption layer 4 is provided. By making the light absorbing layer 4 into an arbitrary shape, it is possible to show a character or a pattern such as a specific pattern to be color-shifted on the iris film 3.
[0022]
The adhesive layer 6 shown in FIG. 4 may be made of a general adhesive material unless the metal vapor deposited layer 5, the light absorbing layer 4 or the iris multilayer film 3 is directly altered or affected. I can do it. For example, vinyl chloride-vinyl acetate copolymer, polyester-based polyamide, acrylic-based, butyl rubber-based, natural rubber-based, silicone-based, polyisobutyl-based pressure-sensitive adhesive alone, or alkyl methacrylate, vinyl ester, acrylonitrile, styrene, vinyl monomer Aggregating components such as, unsaturated carboxylic acid, hydroxy group-containing monomer, modifying components typified by acrylonitrile, and additives such as polymerization initiator, plasticizer, curing agent, curing accelerator, antioxidant, etc. Those added accordingly can be used. For forming the adhesive layer 6, a known printing method such as a gravure printing method, an offset printing method, a screen printing method, or a coating method such as a bar coating method, a gravure coating method, or a roll coating method can be used.
[0023]
【Example】
Next, the present invention will be specifically described with reference to examples.
<Example 1>
A part of the back surface of a 19 μm thick iris multilayer film made of two kinds of PET and fluorine-based PMMA is printed to a thickness of 3 μm by a screen printing method using an ink consisting of the following [light-absorbing layer composition]. An absorption layer was formed, and then aluminum powder was deposited on the entire surface by vacuum deposition to a thickness of 200 ° to form a metal deposition layer.
Further, an adhesive consisting of the following [composition of the adhesive layer] is printed on the metal-deposited layer to a thickness of 10 μm (wet) by a gravure printing method to form an adhesive layer. The forging prevention seal was obtained by punching into a shape.
[0024]
[Composition of light absorbing layer]
Black ink for screen:
SS66 911 black ink (manufactured by Toyo Ink Mfg. Co., Ltd.) 90 parts Diluent:
S965 solvent (Toyo Ink Manufacturing Co., Ltd.) 10 parts [Composition of adhesive]
Acrylic resin:
BPS5160 (manufactured by Toyo Ink Manufacturing Co., Ltd.) 60 parts diluent solvent:
40 parts of VC202C solvent (manufactured by Toyo Ink Mfg. Co., Ltd.)
The anti-counterfeit seal obtained above was attached to the cover of the voucher of the gift certificate, and it was copied with a color copier to make a duplicate. The front of the anti-counterfeit seal had a light absorbing layer when viewed from the front. Although the portion where is printed appears to change color from red to green depending on the viewing angle, a specific color was not seen in the portion where aluminum deposition was visible through the iris multilayer film.
On the other hand, in the above replicated product, there is no color change in the light absorbing layer portion of the iris multilayer film, and furthermore, the portion where aluminum deposition is visible through the iris multilayer film does not reproduce the metallic luster of aluminum, facilitating counterfeiting. I was able to find it.
[0026]
【The invention's effect】
The present invention having the above configuration has the following effects.
That is, in the forgery prevention medium and the forgery prevention seal according to the first and second aspects of the invention, the light absorption layer is provided on at least a part of the iris multilayer film whose color changes depending on the viewing angle. The color changes depending on the viewing angle in a portion where there is, but a specific color cannot be seen from any angle in a portion where there is no light absorbing layer. Therefore, it is possible to prevent fraudulent acts such as forgery, falsification, and alteration by a color copier or the like, and to further enhance the effect of preventing forgery by a color copier or the like. Further, since the light absorbing layer can be formed by a known printing method and a commonly used colored ink, it can be formed into an arbitrary shape such as a character or a picture, and can be manufactured at almost constant cost regardless of the area of color shift. There is an effect that can be performed.
[0027]
Therefore, the present invention has an excellent practical effect as an anti-counterfeit medium made of an iris multilayer film whose reflection color changes according to a change in viewing angle (viewing angle) and an anti-counterfeit seal using this anti-counterfeit medium. Demonstrate.
[Brief description of the drawings]
FIG. 1 is a top view showing an embodiment of a forgery prevention medium according to the present invention.
FIG. 2 shows an embodiment of a forgery prevention medium of the present invention, and is a cross-sectional view taken along the line XX of FIG.
FIG. 3 is a top view showing one embodiment of the forgery prevention seal of the present invention.
FIG. 4 is a cross-sectional view taken along the line YY of FIG. 3, showing one embodiment of the forgery prevention seal of the present invention.
[Explanation of symbols]
1 anti-counterfeiting medium 2 anti-counterfeit seal 3 iris multilayer film 4 light absorbing layer 5 metal vapor deposition layer 6 adhesive layer 7 interlayer portions 8 and 11 of iris multilayer film 3 , 14, 16 ° incident light (all wavelengths)
9 Reflected light viewed at a viewing angle A 10, 13 Light reflected on the iris multilayer film and absorbed by the light absorbing layer 12 Reflected light viewed at a viewing angle B 15 ° Incident light 14 is a reflected light (all wavelengths) in which a specific wavelength reflected by the interlayer and the reflected light 18 are combined.
Of the 17 [deg.] Incident light 16, the wavelength light 18 [deg.] Reflected by the interlayer 7 18 [deg.] The light 19 [deg.] Light absorbed by the iris multilayer film 3 and reflected by the metal deposition layer 5 Part with absorption layer 20 Part without light absorption layer

Claims (2)

A light-absorbing layer is provided as at least one pattern on a part of the back surface of the iris multilayer film in which two or more kinds of thin films are alternately laminated, and further includes a pattern of the light-absorbing layer thereon. An anti-counterfeit medium comprising a multilayer film provided with a metal deposition layer on substantially the entire surface. An anti-counterfeit seal comprising an anti-counterfeit medium according to claim 1 and an adhesive layer provided on a surface of the metal deposition layer.

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