JP2007003673A - Forgery prevention medium, forgery prevention body used for the same and forgery prevention body transfer foil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forgery prevention body and a forgery prevention body transfer foil which are endowed with a specific visually impressive property based on color shift of an optical variance device (OVD) such as hologram and cholesteric liquid crystal by integrating a diffraction structure layer part and the cholesteric liquid crystal, and are capable of performing the discrimination at a glance and the verification by using a polarizing film, and to provide a forgery prevention medium using the forgery prevention body and the forgery prevention body transfer foil. <P>SOLUTION: In the forgery prevention medium 1 which requires a forgery prevention measure, the diffraction structure layer 3 part such as hologram and a part of the cholesteric liquid crystal layer 4 which generates color changes in accordance with viewing angles are integrally formed on a part of a substrate 2 and a light absorbing layer is disposed between the cholesteric liquid crystal 4 and the substrate 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to various information display media that require anti-counterfeiting, and more specifically, formed on securities such as gift certificates and credit cards, or articles that require proof of authenticity such as packages of branded products and equipment parts. The present invention relates to a forgery prevention body, a forgery prevention body transfer foil, and a forgery prevention medium on which these forgery prevention bodies are formed.

  In recent years, as a means of preventing counterfeiting, light interference can be used to express stereoscopic images and special decorative images. By overlapping holograms, diffraction gratings, and thin films with different optical properties, color changes (color shifts) can be achieved depending on the viewing angle. OVD (Optical (ly) Variable Device) such as the resulting multilayer thin film has been used. These OVDs require advanced manufacturing technology, have a unique visual effect, and can be judged at a glance, so that they can be determined at a glance as an effective counterfeiting measure, such as credit cards, securities, certificates, etc. Is being used. Recently, in addition to securities, it is affixed to sports goods, computer parts and other electronic product software, etc., and authentication seals that prove the authenticity of the products, and seals that are affixed to the packages of those products. Has come to be widely used.

  Thus, OVD is an anti-counterfeiting means that is difficult to counterfeit and easy to confirm, but in fact, there are many cases in which it is impossible to find out counterfeit products that are used in a similar manner. That is, it is very difficult in terms of equipment and technology to copy the OVD image exactly the same, but if it is a similar image, it is possible to craft using a commercially available OVD.

  In order to solve this problem, proposals have been made to form an OVD such as a hologram on a cholesteric liquid crystal film (see, for example, Patent Document 1).

The above prior art documents are shown below.
JP 2000-813065 A (Claim 11)

  However, the configuration of the OVD is given a verification function using the polarization of cholesteric liquid crystal, and it is possible to distinguish a counterfeit product from an authentic product by holding the polarizing film, but the appearance features are holograms, etc. As a result, there is a problem that it is impossible to distinguish a counterfeit product from a genuine product at a glance.

  The present invention solves the problems of the prior art, and the problem is that the cholesteric liquid crystal that produces a color shift depending on the angle is integrated to make the OVD such as a hologram unique to the color shift of the cholesteric liquid crystal. Another object of the present invention is to provide an anti-counterfeit body, an anti-counterfeit body transfer foil, and an anti-counterfeit medium using the same, which can have distinct visual indicia and can be discriminated by a glance and verified using a polarizing film.

In order to achieve the above object in the present invention, the invention of claim 1 is an anti-counterfeit medium that requires anti-counterfeit measures, and at least a part on the substrate is seen as a diffraction structure layer part. The anti-counterfeit medium is characterized in that a cholesteric liquid crystal layer portion that changes in color depending on an angle is integrally formed.
Is.

  The invention according to claim 2 provides the anti-counterfeit medium according to claim 1, wherein a light absorption layer is provided on the entire surface or a part of the surface between the cholesteric liquid crystal layer and the substrate. is there.

  In the invention of claim 3, the cholesteric liquid crystal layer portion or the diffractive structure layer portion is formed in a pattern as shown by using at least one of numbers, letters, figures, symbols, and the like. The anti-counterfeit medium according to any one of claims 1 to 2.

  Moreover, in invention of Claim 4, it is a forgery prevention body used for the forgery prevention medium of any one of the said Claim 1 thru | or 3, Comprising: On the whole surface or one part of one surface of a transparent base film. The anti-counterfeiting body is characterized in that a cholesteric liquid crystal layer that changes color depending on the viewing angle is provided, a diffractive structure layer part is laminated on a part of the other surface, and an adhesive layer is laminated on the entire surface. is there.

  The invention according to claim 5 is the anti-counterfeit transfer foil used for the anti-counterfeit medium according to any one of claims 1 to 3, wherein at least a part of the diffraction structure layer is formed on the support film. The anti-counterfeiting body transfer foil is characterized in that a cholesteric liquid crystal layer portion that changes in color depending on the viewing angle is integrally formed, and an adhesive layer is laminated on the diffractive structure layer portion and the cholesteric liquid crystal layer portion. It is.

  The invention of claim 6 is an anti-counterfeit medium that requires anti-counterfeit measures, and at least a part of the article on the diffractive structure layer part and a cholesteric liquid crystal layer part that changes color depending on the viewing angle are integrated. The medium is a forgery prevention medium characterized by being formed.

  The invention according to claim 7 provides the anti-counterfeit medium according to claim 6, wherein a light absorption layer is provided on the entire surface or a part of the space between the cholesteric liquid crystal layer and the article. .

  In the invention of claim 8, the cholesteric liquid crystal layer portion or the diffractive structure layer portion is formed in a pattern as shown by using at least one of numbers, letters, figures, symbols, and the like. The anti-counterfeit medium according to any one of claims 6 to 7.

  The invention according to claim 9 is an anti-counterfeit body for use in the anti-counterfeit medium according to any one of claims 6 to 8, wherein the anti-counterfeit body is formed on the entire surface or a part of one surface of the transparent substrate film. The anti-counterfeiting body is characterized in that a cholesteric liquid crystal layer that changes color depending on the viewing angle is provided, a diffractive structure layer portion is laminated on a part of the other surface, and an adhesive layer is laminated on the entire surface. is there.

  Since this invention is the above structure, there exist the following effects.

That is, according to the first aspect of the present invention, in the anti-counterfeit medium for which anti-counterfeit measures are required, at least a part on the substrate has a diffractive structure layer part and a cholesteric liquid crystal layer part that causes a color change depending on the viewing angle. , The color shift of the cholesteric liquid crystal and the unique glitter of the diffractive structure layer such as the hologram can be confirmed at the same time, and further, the color change of the cholesteric liquid crystal is observed by overlapping the polarizing film. An anti-counterfeit medium such as an ID card that can identify a genuine product can be provided.

  According to the second aspect of the present invention, the light-absorbing layer is provided on the entire surface or a part of the substrate between the cholesteric liquid crystal layer and the base material, so that the color shift effect of the cholesteric liquid crystal layer is made clearer. It can be set as a forgery prevention medium.

  According to the third aspect of the present invention, the cholesteric liquid crystal layer portion or the diffractive structure layer portion is formed in a pattern as shown by using at least one of numbers, letters, figures, symbols, and the like. Therefore, it is possible to provide a forgery prevention medium that can be easily confirmed and verified, and is more difficult to forge.

  The invention according to claim 4 is an anti-counterfeit body used for the anti-counterfeit medium according to any one of claims 1 to 3, wherein the entire surface of one surface of the transparent substrate film is used. Alternatively, a cholesteric liquid crystal layer that changes in color depending on the viewing angle is provided in part, and the diffractive structure layer part is formed on a part of the other surface, and the adhesive layer is laminated on the entire surface. The forgery prevention body which can manufacture easily the forgery prevention medium affixed on the base material can be made.

  The invention according to claim 5 is the anti-counterfeit transfer foil used for the anti-counterfeit medium according to any one of claims 1 to 3, wherein at least a part on the support film is used. The diffractive structure layer part and the cholesteric liquid crystal layer part that changes color depending on the viewing angle are integrally formed, and the adhesive layer is laminated on the diffractive structure layer part and the cholesteric liquid crystal layer part. An anti-counterfeit body transfer foil that can easily produce an anti-counterfeit medium in which heat is applied to the material and the material is pressure-bonded can be obtained.

  The invention according to claim 6 is an anti-counterfeit medium that requires anti-counterfeit measures, and a cholesteric liquid crystal layer that produces a color change depending on a viewing angle and a diffractive structure layer part at least on a part of an article. By forming the parts together, the color shift of the cholesteric liquid crystal and the unique glitter of the diffraction structure layer such as hologram can be confirmed at the same time, and furthermore, the color change of the cholesteric liquid crystal can be observed by overlapping the polarizing film. Thus, a forgery prevention medium such as a package that can identify a genuine product can be obtained.

  According to the seventh aspect of the present invention, since the light absorbing layer is provided between the cholesteric liquid crystal layer and the article over the entire surface or a part thereof, the color shift effect of the cholesteric liquid crystal layer can be further clarified. It can be set as a forgery prevention medium.

  According to the eighth aspect of the present invention, the cholesteric liquid crystal layer portion or the diffractive structure layer portion is formed in a pattern as shown by using at least one of numbers, letters, figures, symbols, and the like. Therefore, it is possible to provide a forgery prevention medium that can be easily confirmed and verified, and is more difficult to forge.

  Furthermore, according to the invention according to claim 9, the anti-counterfeit body used in the anti-counterfeit medium according to any one of claims 6 to 8, wherein the anti-counterfeit body is provided on one side of the transparent base film. A cholesteric liquid crystal layer that changes color depending on the viewing angle is provided on the entire surface or part of the surface, and a diffractive structure layer portion is formed on a part of the other surface, and an adhesive layer is laminated on the entire surface. The anti-counterfeit body can be used as a seal sticker or a proof sticker attached to an article.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a front view showing an example of an anti-counterfeit medium according to the present invention, and FIG. 2 is a side sectional view thereof.

  The anti-counterfeit medium 1 of the present invention has, for example, a diffractive structure layer portion 3 and a cholesteric liquid crystal layer 4 on a part of a substrate 2 as shown in FIGS. Further, from the viewpoint of preventing forgery, these layers are preferably provided in a shape having specific information such as a pattern, characters, numbers, and the like as shown in FIG.

  3-6 is sectional drawing which shows one Example of the forgery prevention body 20 of this invention, FIG. 7-9 is sectional drawing of the forgery prevention body transfer foil 30 of this invention.

  In the anti-counterfeit body 20 of the present invention, a cholesteric liquid crystal layer is formed on the transparent substrate film 5 as shown in FIGS. 3 to 6 and on the support film 8 in the anti-counterfeit body transfer foil 30 as shown in FIGS. Four parts and three parts of the diffractive structure layer are provided. As the transparent substrate film 5 and the support film 8, any known polymer film can be appropriately selected and used as long as it is a material having high transparency and can withstand processing such as coating and vapor deposition. It is.

  As the cholesteric liquid crystal layer 4, this layer 4 has a selective reflectivity exhibiting a beautiful color shift effect under white light and, when observed through a circularly polarizing film, the direction of the circularly polarized light of the cholesteric liquid crystal layer 4 It has a circularly polarized light selectivity such that the reflected light from the light is blocked or transmitted, and is a layer having a visual verification function and a verification function using a polarizing film.

  The cholesteric liquid crystal layer 4 used in the present invention is made of a compound having a cholesteric structure or having a cholesteric structure under temperature conditions, and is not particularly limited, and a known cholesteric liquid crystal material can be used. After coating, it is necessary to align and fix by applying ultraviolet irradiation or heat, but the orientation means and fixing means can be appropriately selected from known means. The thickness is preferably about 0.5 to 20 μm in order to obtain the characteristics. Furthermore, from the viewpoint of preventing counterfeiting, it is preferable to display information by providing a partial pattern such as a pattern or a character as shown in FIGS. 1 to 3, but when observed from the surface (upper part in the figure). If the portion of the cholesteric liquid crystal layer 4 and the portion of the diffractive structure layer 3 can be observed at the same time, for example, they can be provided on the entire surface as shown in FIGS. 4, 6 and 8 (details of the configuration of FIG. 6). This will be described later.)

  On the other hand, in the case of a transfer foil, it is possible to provide between the support film 8 of the diffractive structure layer 3 or between the diffractive structure layer 3 and the adhesive layer 6 as shown in FIGS. If the position of the cholesteric liquid crystal layer 4 and the portion of the diffractive structure layer 3 can be observed at the same time, they can be selected and formed as appropriate.

On the other hand, it is preferable to provide the light absorption layer 7 as shown in FIGS. That is, it is provided to prevent light transmitted through the cholesteric liquid crystal layer 4 (light having a wavelength other than the selectively reflected wavelength) from being reflected / scattered on the base material 2 and mixed with the light selectively reflected by the cholesteric liquid crystal layer 4. Is a layer. The light absorbing layer 7 is preferably printed with black ink that is difficult to transmit light and is easily absorbed, or color ink close to black. However, blue, red, etc. are appropriately selected in consideration of design and visibility. It is possible to print. As with the cholesteric liquid crystal layer 4, the light absorption layer 7 is preferably provided not only on the entire surface but also in a pattern such as a picture or a character to display information from the viewpoint of forgery prevention (
(See FIG. 3). Further, the position to be provided may be provided between any layers as long as it is below the cholesteric liquid crystal layer 4 as viewed from the observation side, or may be provided below the cholesteric liquid crystal layer 4 as shown in FIG. The lower side of the material film 5 may be provided, or the lower side of the diffractive structure layer 3 as shown in FIG. 6, and the adhesive layer 6 may be colored to serve as the light absorption layer 7. These positions can be appropriately selected and provided from the viewpoint of manufacturing and the like.

  Although the anti-counterfeit body 20 having the cholesteric liquid crystal layer 4 and the diffractive structure layer 3 as shown in FIGS. 3 to 6 is not particularly illustrated, those formed on separate transparent base films are respectively provided with an adhesive or an adhesive. And may be integrated by bonding. For example, an adhesive layer is formed on one surface of a transparent substrate film on which a diffractive structure layer is formed, and a cholesteric liquid crystal layer of a film on which a cholesteric liquid crystal layer is formed is laminated and bonded so as to face the adhesive layer surface. Created by. Of course, an adhesive / adhesive layer may be formed on the diffractive structure and bonded to the cholesteric liquid crystal layer, or an adhesive layer or an adhesive layer may be provided on the cholesteric liquid crystal layer or its support.

  Furthermore, after bonding, you may peel off the transparent base film which formed the cholesteric liquid crystal layer, or the transparent base film which formed the diffraction structure layer. Moreover, as an adhesive or an adhesive, it may be formed in a pattern such as a picture or a letter. In this case, an adhesive or the like is used when peeling off either the diffractive structure layer or the transparent substrate film on which the cholesteric liquid crystal layer is formed. The part without is peeled off together with the transparent substrate film.

  The pressure-sensitive adhesive or adhesive may be a known one represented for film lamination, and may be used as a light absorbing layer for a cholesteric liquid crystal layer by coloring the adhesive with carbon black or the like in some cases. is there. A known apparatus such as a roll laminator can be used for bonding.

  For example, the diffractive structure layer 3 shown in FIGS. 3 to 9 is a layer formed with a diffractive structure such as a hologram or a diffraction grating. These holograms and diffraction gratings are images using interference of light, and are display bodies having a unique radiant feeling that shines with a color shift that changes in color depending on the representation of a stereoscopic image and the viewing angle. Among them, examples of the diffractive structure such as a hologram include a relief type that records light interference fringes on a plane as a fine uneven pattern and a volume type that records interference fringes in the volume direction. Among these, when considering mass productivity and cost, a relief type hologram (diffraction grating) is preferable, and generally a relief type is widely used. Hereinafter, the relief type hologram (diffraction grating) will be described in detail. .

  The relief hologram (diffraction grating) needs to be provided with a relief forming layer composed of a fine concavo-convex pattern and a reflection layer for reflecting light on the surface. These are hereinafter referred to as the diffraction structure forming layer 11 and the diffraction structure effect layer 12 and will be described in detail.

  The diffractive structure forming layer 11 is required to be capable of being molded by a press plate having fine irregularities, and a polymer resin is used as the material thereof.

  On the other hand, the diffractive structure effect layer 12 is a layer provided to increase the diffraction efficiency of the drawn image, and is made of a material having a refractive index different from that of the polymer material constituting the relief surface. Examples of the material used therefor include metal materials such as Al, Sn, Cr, Ni, Cu, and Au that have a high reflection effect, and metal oxides that have a high refractive index such as TiO2, but are not limited thereto, and are publicly known. Any material can be used as appropriate.

Further, the diffractive structure effect layer 12 may be provided on one surface as shown in FIGS. 3 to 5 but may be partially formed as shown in FIGS. As the formation method, a known method such as a method of partially forming the diffractive structure effect layer 12 or a method of partially removing the diffractive structure effect layer 12 after being provided on the entire surface can be appropriately selected and formed.

  Furthermore, as a hologram or diffraction grating imaging technique, a special diffraction grating (the present inventors, etc.) that can express a high brightness by expressing a 3D hologram or diffraction grating that reproduces a three-dimensional image with minute dots. Is referred to as a grating image). Recently, a method of forming minute dots of a diffraction grating with a specific shape such as a star shape, a technique of drawing fine characters that are not visible to the naked eye called micro characters, as if using a diffraction grating as if in a photograph A method for faithfully reproducing the color of a subject or a method for expressing a plurality of images that are completely different depending on the viewing angle (the present inventors refer to as changing) has been developed.

  In the present invention, the present invention is not limited to these, and any known image expression technique can be used as well as the above-described image expression technique.

  Further, the diffractive structure effect layer 12 may be provided on one surface as shown in FIGS. 3 to 5 but may be partially formed as shown in FIGS. As the formation method, a known method such as a method of partially forming the diffractive structure effect layer 12 or a method of partially removing the diffractive structure effect layer 12 after being provided on the entire surface can be appropriately selected and formed.

  Next, the adhesive layer 6 is a layer provided for the purpose of adhering the anti-counterfeit body of the present invention to the base material 2 or an article (not shown) serving as an anti-counterfeit medium. As the material, known materials called pressure-sensitive adhesives and adhesives can be appropriately selected and used.

  7 to 9, in the anti-counterfeit body transfer foil 30 of the present invention, the cholesteric liquid crystal is used to peel off the support film 8 after the anti-counterfeit body of the present invention is adhered to the substrate 2. The layer 4 or the diffractive structure layer 3 needs to be easily peeled off from the support film. Therefore, it is also possible to apply a release agent such as a silicone resin to the support film, or to provide a single layer of a polymer resin that is well peeled off from the support film.

  Specific examples of the present invention will be described below.

  As shown in FIG. 6, the polymer resin ink that becomes the diffraction structure forming layer 11 is applied to the transparent base film 5 made of a transparent polyethylene terephthalate (PET) film having a thickness of 50 μm, and the film thickness after drying for 10 seconds at 150 ° C. It provided so that it might become 5 micrometers.

  Next, after forming a hologram relief pattern (not shown) by a roll embossing method, aluminum was formed as a light reflective diffractive structure effect layer 12 so as to have a film thickness of 50 nm by a vacuum deposition method. Next, the ink which consists of the following compositions was pattern-printed as a mask layer (not shown), and it formed so that the film thickness after drying might be set to 1 micrometer. Next, the prepared transfer sheet (intermediate product) was etched by being immersed in a bath containing 1.5N NaOH solution heated to 50 ° C. for 10 seconds, and then neutralized with 0.1N HCl solution. Then, a desired partially formed diffraction structure layer 3 was obtained through a water washing / drying process.

  Next, the light absorbing layer 5 made of black ink was applied in an amount of 2 μm over the entire surface and the adhesive layer 6 made of an adhesive material was applied in an order of 20 μm. Finally, cholesteric liquid crystal ink was applied to the other surface of the transparent substrate film 5 over the entire surface of 5 μm to produce a forgery prevention body 20 such as a seal seal or an authentication seal. Details of the composition of each layer are shown below.

[Transparent substrate film]
PET 50μm
(Diffraction structure forming layer)
Acrylic polyol: 80 parts Isocyanate curing agent: 20 parts [Diffraction structure effect layer]
Al deposition 500
[Mask layer]
Vinyl chloride / vinyl acetate copolymer resin: 100 parts [light absorption layer]
Black pigment: 30 parts Vinyl chloride / vinyl acetate copolymer resin: 70 parts [Adhesive layer]
Acrylic adhesive: 100 parts [Cholesteric liquid crystal layer]
Cholesteric liquid crystal (polyester main chain type liquid crystal polymer): 100 parts

  As shown in FIG. 7, 1 μm of a polymer resin that can be easily peeled off from the support film 8 is applied to a support film 8 made of a transparent polyethylene terephthalate (PET) film having a thickness of 25 μm (release layer: not shown). The cholesteric liquid crystal layer 4 was applied in a pattern (“TOP” in FIG. 1) of 1 μm, and then the diffractive structure forming layer 11 was provided to be 1 μm.

  Next, after forming a hologram relief pattern (not shown) by a roll embossing method, aluminum was formed as a light reflective diffractive structure effect layer 12 so as to have a film thickness of 50 nm by a vacuum deposition method. Next, the ink which consists of the following compositions was pattern-printed as a mask layer (not shown), and it formed so that the film thickness after drying might be set to 1 micrometer. Next, the prepared transfer sheet (intermediate product) was etched by being immersed in a bath containing 1.5N NaOH solution heated to 50 ° C. for 10 seconds, and then neutralized with 0.1N HCl solution. Then, a desired partially formed diffraction structure layer 3 was obtained through a water washing / drying process.

  Next, a light absorbing layer 7 made of black ink was applied to the entire surface in an order of 2 μm and an adhesive layer 6 made of an adhesive material was applied in an order of 3 μm in order to produce a forgery prevention body transfer foil 30 of the present invention.

  The anti-counterfeit body transfer foil 30 obtained above is overlaid on a white card made of vinyl chloride of 0.8 mm thickness, and bonded with a transfer machine under conditions of 150 ° C. and 0.2 sec. It peeled and the forgery prevention medium like an ID card was obtained.

[Support film]
PET 25μm
[Cholesteric liquid crystal layer]
Cholesteric liquid crystal (polyester main chain type liquid crystal polymer): 100 parts [Diffraction structure forming layer]
Acrylic polyol: 80 parts Isocyanate curing agent: 20 parts [Diffraction structure effect layer]
Al deposition 50nm
[Mask layer]
Vinyl chloride / vinyl acetate copolymer resin: 100 parts [light absorption layer]
Black pigment: 50 parts Vinyl chloride / vinyl acetate copolymer resin: 50 parts [Adhesive layer]
Acrylic adhesive for heat-sensitive adhesion ... 50 parts Barium sulfate particles (filler) ... 50 parts Any of the anti-counterfeit medium to which the anti-counterfeit body of Example 1 and the anti-counterfeit body transfer foil of Example 2 are transferred is cholesteric liquid crystal. The color shift effect and hologram glitter were unique and had a distinctive visual property. Furthermore, the effect that the color of the cholesteric liquid crystal can be seen or disappeared when the circularly polarizing films are overlapped was confirmed.

  As described above, the anti-counterfeit medium of the present invention and the anti-counterfeiting body and anti-counterfeiting body transfer foil used therein partially have a color shift effect of cholesteric liquid crystal and a glitter feeling such as a hologram or a diffraction grating. Because it has a unique visual property, it is possible to distinguish the genuine product at a glance. Furthermore, by verifying the circular polarizing film, it is possible to distinguish the genuine product from the color change of the cholesteric liquid crystal layer. It has a high anti-counterfeiting property and is easier to identify and confirm.

It is a top view which shows one Embodiment of the forgery prevention medium of this invention. It is a sectional side view of the forgery prevention medium of FIG. It is a sectional side view which shows one example of the forgery prevention body of this invention. It is a sectional side view which shows the other example of the forgery prevention body of this invention. It is a sectional side view which shows the other example of the forgery prevention body of this invention. It is a sectional side view which shows the other example of the forgery prevention body of this invention. It is a sectional side view which shows one example of the forgery prevention body transfer foil of this invention. It is a sectional side view which shows the other example of the forgery prevention body transfer foil of this invention. It is a sectional side view which shows the other example of the forgery prevention body transfer foil of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Anti-counterfeiting medium 2 ... Base material 3 ... Diffraction structure layer 4 ... Cholesteric liquid crystal layer 5 ... Transparent base film 6 ... Adhesion layer 7 ... Light absorption layer 8 ... Support film 11 ... Diffraction structure forming layer 12 ... Diffraction structure effect layer 20 ... Anti-counterfeit body 30 ... Anti-counterfeit body transfer foil

Claims (9)

  An anti-counterfeit medium that requires anti-counterfeiting measures, characterized in that a diffractive structure layer part and a cholesteric liquid crystal layer part that changes color depending on the viewing angle are integrally formed on at least a part of the substrate. Anti-counterfeiting media.   The anti-counterfeit medium according to claim 1, wherein a light absorption layer is provided on the entire surface or a part thereof between the cholesteric liquid crystal layer and the substrate.   3. The cholesteric liquid crystal layer portion or the diffractive structure layer portion is formed in a pattern as shown by using at least one of numbers, letters, figures, symbols, and the like. The anti-counterfeit medium according to claim 1.   The anti-counterfeit body used in the anti-counterfeit medium according to any one of claims 1 to 3, wherein the cholesteric causes color change depending on a viewing angle on the whole surface or a part of one surface of the transparent base film. An anti-counterfeiting body comprising a liquid crystal layer, a diffractive structure layer portion on a part of the other surface, and an adhesive layer laminated on the entire surface.   The anti-counterfeit body transfer foil used for the anti-counterfeit medium according to any one of claims 1 to 3, wherein a color change is caused depending on a viewing angle and a diffraction structure layer portion at least on a part of the support film. A forgery-preventing body transfer foil, wherein a cholesteric liquid crystal layer portion is integrally formed, and an adhesive layer is laminated on the diffractive structure layer portion and the cholesteric liquid crystal layer portion.   An anti-counterfeit medium that requires anti-counterfeiting measures, characterized in that a diffraction structure layer portion and a cholesteric liquid crystal layer portion that changes in color depending on the viewing angle are integrally formed on at least a portion of the article. Anti-counterfeit medium.   The anti-counterfeit medium according to claim 6, wherein a light absorption layer is provided on the entire surface or a part thereof between the cholesteric liquid crystal layer and the article.   8. The cholesteric liquid crystal layer portion or the diffractive structure layer portion is formed in a pattern shape indicated by using at least one of numbers, letters, figures, symbols, and the like. The anti-counterfeit medium according to claim 1.   9. A forgery-preventing body for use in the anti-counterfeit medium according to any one of claims 6 to 8, wherein the cholesteric produces a color change depending on a viewing angle on the whole or a part of one surface of the transparent base film. An anti-counterfeiting body comprising a liquid crystal layer, a diffractive structure layer portion on a part of the other surface, and an adhesive layer laminated on the entire surface.

Images