CN101363931B - Medium, substate, medium label, medium transfer sheet, sheet, and information recording medium - Google Patents

Abstract

The present invention relates to a medium for judging authenticity, which can eliminate the difficulties of shortening the manufacturing time when forming the judging portion by embossing a hologram, many steps in manufacturing the embossing mold, and the pattern of the judging portion Difficulty in changing, the present invention will be made of the film layer (2) made of materials that change the light transmittance or reflectance by heating, and the orientation film (4) that exists as needed, the color change layer (3), such as containing cholesteric The optically selective reflective layer of the liquid crystal layer is laminated on the substrate (12), and is recorded on the thin film layer (2) by a thermal head etc., and then by observing the hue change or Observing the presence or absence of reflection or hue through a circular polarizer can solve the above problems.

Description

Media, substrates, media labels, media transfer sheets, sheets, and information recording bodies

The application date is April 11, 2005, the application number is 200580011360.0, and the title of the invention is "a medium for judging authenticity, a substrate for judging authenticity, a medium label for judging authenticity, and a medium for judging A divisional application of the application for a medium transfer sheet that can be authenticated, a sheet that can be judged for authenticity, and an information record that can be judged for authenticity. the

technical field

The present invention relates to a medium for judging authenticity that can be distinguished from an article obtained by forgery or tampering based on illegal intent. The present invention also relates to an authenticable base material using an authenticating medium. The present invention also relates to processing the above-mentioned authenticity-judging medium into a suitable label form or transfer sheet form when applied to articles. The present invention also relates to a sheet or an information recording body using a medium for authenticity determination. the

Background technique

For example, if credit cards, debit cards, various securities or ID cards are forged or tampered and used illegally, it will cause all kinds of troubles. Therefore, in order to prevent losses caused by forgery or tampering, people hope that they can identify their authenticity. function. In addition, for example, high-end goods such as watches, leather products, precious metal products, or jewelry, especially goods called high-end brand-name goods, audio-visual products, electrical products, or music software, video software, game software or Computer software is also an object of counterfeiting, and likewise, people want to have the function of recognizing authenticity. the

In the past, holograms were often used in order to verify the authenticity of various items including those mentioned above. This is because the hologram is difficult to manufacture because of its fine structure. However, the manufacturing method of holograms is only known to experts, and it is a delicate product, so it is difficult to distinguish real holograms from counterfeit holograms. the

] Therefore, someone proposes an authenticity judging body as a substitute for a hologram, which has a base material, a light selective reflection layer, and a judging portion; wherein the light selective reflection layer is formed on one surface of the base material, Only one of the left-handed polarized light and the right-handed polarized light in the incident light is reflected; the judging part is formed on at least a part of the light selective reflection layer, and has judging information for judging a new product (for example, refer to Patent Document 1).

[Patent Document 1] Japanese Unexamined Patent Publication No. 2000-25373 (page 3-5, Fig. 1)

In the authenticity judging body of Patent Document 1, the judging part is still formed by embossed holograms. Although the judging part can form a precise pattern, in order to fully reproduce the unevenness of the hologram engraved on the embossing mold, it is necessary to make the embossing mold and the molding material The contact time is sufficiently long, making it difficult to shorten the manufacturing time, and the manufacturing process of the press mold itself has many steps, so it is difficult to change the determination part pattern. the

Contents of the invention

The object of the present invention is to provide a medium for judging authenticity, which can eliminate the problem that it is difficult to shorten the manufacturing time when forming the judging part by embossing a hologram; The problem of changing the pattern of the judging part. the

The above-mentioned problems of the present invention can be solved by a structure in which a patterned metal thin film or the like is melted or evaporated by heating with left-handed circularly polarized light or right-handed circularly polarized light among reflected incident light such as a cholesteric liquid crystal layer. A kind of light selective reflective layer or other color changing layers are laminated. Thereby completed the present invention based on this:

The above-mentioned problems of the present invention are also solved by a structure in which cholesteric liquid crystals having different hues are laminated through a retardation layer when observing by stacking a right-handed circular polarizing plate and when observing by stacking a left-handed circular polarizing plate. , or a structure in which the laminated structure is combined with a hologram or the like. The present invention has thus been accomplished based on this. the

The above-mentioned problems of the present invention are also solved by, for example, forming a light selective reflective layer made of cholesteric liquid crystal in a pattern shape, and forming holograms sequentially behind it. The present invention can be realized based on this. the

The first invention relates to a medium for judging authenticity, characterized in that the medium has a laminated structure in which two light selective reflection layers are laminated with a phase difference layer between the two layers, and the two light selective reflection layers are laminated. The reflective layer is made of a light selective reflective material that reflects one of left-handed circularly polarized light or right-handed circularly polarized light in incident light, and the central wavelengths of reflected light of the two light selective reflective layers are different from each other. the

A second invention relates to the authentication medium of the first invention, wherein the retardation layer is a transparent base film. the

The third invention relates to the authentication medium of the first invention, wherein the retardation layer is a laminate comprising a transparent film and a nematic liquid crystal layer. the

A fourth invention relates to the authentication medium according to any one of the first to third inventions, wherein a light diffraction structure layer is laminated on one surface of the laminated structure. the

A fifth invention relates to the authentication medium according to the fourth invention, wherein the light diffraction structure layer is a reflection hologram. the

The sixth invention relates to the authentication medium according to the fourth or fifth invention, wherein the light diffraction structure layer is accompanied by a light reflective layer. the

The seventh invention relates to a medium label for authenticity determination, characterized in that an adhesive layer is further laminated to the medium for authenticity determination according to any one of the first to sixth inventions. the

An eighth invention relates to a medium transfer sheet for authentication, wherein the medium for authenticity according to any one of the first to sixth inventions is laminated on a peelable surface of a peelable substrate. the

A ninth invention relates to an authenticity-determinable sheet material, characterized in that the authenticity determination medium according to any one of the first to sixth inventions is visibly provided on a part of the sheet material. the

The tenth invention relates to an information record capable of authenticity determination, characterized in that the authenticity determination medium according to any one of the first to sixth inventions is laminated on the surface of the information record to be the object of authenticity determination, Or the authenticity determination medium of any one of the 1st - 6th invention is visibly provided on a part of the said information recording body. the

The eleventh invention relates to a medium for judging authenticity, characterized in that the medium is a laminate of a thin film layer whose light transmittance or reflectance is changed by heating and at least two color change layers that give different colors according to viewing angles. made. the

The twelfth invention relates to the authentication medium according to the eleventh invention, wherein the color change layer is a light selective reflective layer that reflects either left-handed circular polarization or right-handed circular polarization of incident light. the

The thirteenth invention relates to the authentication medium according to the twelfth invention, wherein the light selective reflection layer includes a cholesteric liquid crystal layer. the

The fourteenth invention relates to the authentication medium according to any one of the eleventh to the thirteenth inventions, wherein the color change layer includes two or more layers. the

The fifteenth invention relates to the authentication medium according to any one of the eleventh to the thirteenth inventions, wherein the color change layer includes two layers, and a retardation layer is interposed between the two layers. the

The sixteenth invention relates to an authenticity-determining substrate, wherein a part of the substrate visibly has the authenticity-determining medium according to any one of the eleventh to fifteenth inventions. the

The 17th invention relates to a medium label for authenticity determination, characterized in that the label is further laminated with an adhesive layer on the medium for determination of authenticity according to any one of the 11th to 15th inventions. the

The eighteenth invention relates to a medium transfer sheet for authenticity determination, wherein the medium for authenticity determination according to any one of the eleventh to fifteenth inventions is laminated on the detachable surface of the detachable substrate. the

The nineteenth invention relates to a medium for judging authenticity, characterized in that the medium is formed by laminating layers of a light selective reflection pattern layer and a light diffraction structure layer, wherein the light selective reflection pattern layer contains A layer of light-selectively reflective material for either left-handed or right-handed circularly polarized light. the

The 20th invention relates to the authentication medium according to the 19th invention, wherein the light selective reflection pattern layer is laminated on one side of the transparent substrate, and the light diffracting pattern layer is laminated on the other surface of the transparent substrate. structural layer. the

The 21st invention relates to the authentication medium according to the 19th invention, wherein the light selective reflection pattern layer and the light diffraction structure layer are sequentially laminated on one side of the transparent substrate. the

The 22nd invention relates to the authentication medium according to any one of the 19th to 21st inventions, wherein the light diffraction structure layer is a reflective hologram. the

The 23rd invention relates to the authentication medium according to any one of the 19th to 22nd inventions, wherein the light diffraction structure layer is accompanied by a light reflective layer. the

The 24th invention relates to a medium label for authentication, characterized in that the label is further laminated with an adhesive layer on the medium for authenticity according to any one of the 19th to 23rd inventions. the

The 25th invention relates to a medium transfer sheet for authentication, wherein the medium for authenticity according to any one of the 19th to 23rd inventions is laminated on the detachable surface of the detachable substrate. the

The twenty-sixth invention relates to an authenticity-determinable sheet, wherein a part of the sheet visibly has the authenticity-determining medium of any one of the nineteenth to twenty-third inventions. the

The 27th invention relates to an information recording material capable of authenticity determination, characterized in that the authenticity determination medium according to any one of the above-mentioned 19th to 23rd inventions is laminated on the surface of the information recording material to be the object of authenticity determination. , or visibly has the medium for judging authenticity according to any one of the above-mentioned 19th to 23rd inventions in a part of the above-mentioned information recording body. the

The first invention can provide a medium for judging authenticity, which has a laminated structure in which two light selective reflection layers having different reflection wavelengths are laminated via a phase difference-generating layer, and is irradiated with right-handed circularly polarized light or For left-handed circularly polarized light, one of the two light-selective reflection layers with different reflection wavelengths reflects different colors, so its authenticity can be confirmed by double means, and it is transparent, even if it is superimposed on other objects, the underlying layer can be seen through. the

The second invention can provide a medium for judging authenticity. In addition to the effects of the first invention, the layer that produces a phase difference is a transparent base film, and it is easy to laminate light selective reflection on the front and back of the transparent base film. layer use. the

The third invention can provide a medium for judging authenticity. In addition to the effects of the first invention, the layer that produces a phase difference is a laminate in which a nematic liquid crystal layer is laminated on a transparent base film, and the medium can be easily formed in the laminate. The front and back are separately laminated with light selective reflection layers. the

The 4th invention can provide the medium that is used for judging authenticity, and this medium is except the inventive effect of any one in the 1st - the 3rd invention, and the lower layer is laminated with the light diffraction structure layer, therefore can not make the light diffraction structure layer The visibility of light diffractive structures such as holograms or diffraction gratings is reduced. the

The fifth invention can provide a medium for judging authenticity, which has the excellent appearance of a hologram in addition to the effect of the first invention. the

The sixth invention can provide a medium for judging authenticity. In addition to the effect of the fifth invention, since the hologram is accompanied by a reflective layer, the visibility of the hologram is further improved. the

According to the seventh invention, there can be provided a media label for judging authenticity, which can easily apply the media for judging authenticity, which can exert the effects of any one of the first to sixth inventions, to an article by using an adhesive layer. among. the

The 8th invention can provide a medium transfer sheet for judging authenticity, which makes the medium for judging authenticity capable of exhibiting the effects of any one of the first to sixth inventions into a transferable structure, so it can be Easily applied to items. the

The ninth invention can provide an authenticity-determinable sheet, which uses any one of the authenticity-determining medium of the first to sixth inventions, so that authenticity judgment of additional information can be performed. the

The tenth invention can provide an authenticity-determinable information record, which uses the authenticity-determining medium of any one of the first to sixth inventions, and thus can perform its own authenticity determination. the

The eleventh invention can provide a medium for judging authenticity, in which a color change layer is present at a position where a pattern is formed based on a light transmittance difference or a reflectance difference on a thin film layer, so that the hue can be seen depending on the viewing angle Different, thus authenticity can be judged. the

The twelfth invention can provide a medium for judging authenticity. In addition to the effect of the eleventh invention, at the position of the pattern formed based on the difference in light transmittance or reflectance on the film layer, due to light selective reflectivity Due to the existence of the layer, the hue is also different due to different viewing angles; and the presence or absence of reflected light or the hue of the reflected light can be confirmed by observing through one of the left-handed circular polarizer or the right-handed circular polarizer, so that authenticity can be verified. determination. the

The thirteenth invention can provide a medium for judging authenticity. In addition to the effects of the twelfth invention, the medium uses a cholesteric liquid crystal layer as a light selective reflection layer so that the hue varies depending on the viewing angle, and a left-handed circular polarizer Or when one of the right-handed circular polarizers is observed, the presence or absence of reflected light can be confirmed, thereby making it possible to reliably determine the authenticity. the

The fourteenth invention can provide a medium for judging authenticity. In addition to the inventive effects of any one of the eleventh to thirteenth inventions, the medium has two or more color changing layers, which can be changed depending on the viewing angle. Complex hue changes can be produced. the

The 15th invention can provide a medium for judging authenticity. In addition to the inventive effects of any one of the 11th to 13th inventions, the color change layer has two layers and a retardation layer between the two layers. Therefore, A more complex reflection will be produced, which can further accurately determine the authenticity. the

The sixteenth invention can provide an authenticity-determining base material, and since the base material uses any one of the authenticity-determining medium of the eleventh to fifteenth inventions, authenticity determination of additional information can be performed. the

The seventeenth invention can provide a medium label for authenticity determination, which can be easily achieved by laminating an adhesive layer on the medium for authenticity determination that can exert the effect of any one of the first to fifteenth inventions. applied to items. the

The 18th invention can provide a transfer sheet for judging authenticity by laminating a medium for judging authenticity that can exert the effects of any one of the 11th to 15th inventions on a peelable substrate. material, can be easily applied to items. the

The nineteenth invention can provide a medium for judging authenticity, the medium has a light diffraction structure layer having a specific appearance produced by light diffraction, and a light selective reflection pattern layer in which the light The selective reflective pattern layer is a latent image in the normal state, and it can be seen by irradiation with left-handed circularly polarized light or right-handed circularly polarized light. Polarized light or right-handed circularly polarized light can be used to determine the authenticity, and the formation of the light selective reflection pattern can be easily performed by printing, for example, so the number of manufacturing processes is not increased, and the pattern is easy to change. the

The 20th invention can provide a medium for judging authenticity. In addition to the effect of the 19th invention, the light selective reflection pattern layer and the light diffraction structure layer are laminated with the base material sandwiched between them, so that the production can reduce the occurrence of separate formation. mutual influence. the

The 21st invention can provide a medium for judging authenticity. In addition to the effect of the 19th invention, each layer is laminated on only one side of the substrate, so that the exposed substrate can be used as a protective layer. the

The 22nd invention can provide a medium for judging authenticity, wherein in addition to the effects of any one of the 19th to 21st inventions, the light diffraction structure layer is made of a hologram, so that the hologram image is visible. the

The 23rd invention can provide the medium for judging authenticity, and this medium is except the inventive effect of any one in the 19th-the 22nd invention, and the light diffractive structure layer is also accompanied by the light reflective layer, so the light diffractive structure layer Visibility with appearance is improved. the

The 24th invention can provide a medium label for judging authenticity, wherein the media label can be easily applied to a medium for judging authenticity which can exert the inventive effect of any one of the 19th to 23rd inventions by using an adhesive layer. in the item. the

The twenty-fifth invention can provide a medium transfer sheet for authenticity determination, wherein the transfer sheet can exhibit the effects of any one of the nineteenth to twenty-third inventions, and can be transferred by forming a medium for authenticity determination. structure, so it can be easily applied to articles. the

The twenty-sixth invention provides an authenticity-determinable sheet material, which uses the authenticity-determining medium of any one of the nineteenth to twenty-third inventions, so that additional information can be authenticated. the

The twenty-seventh invention can provide an authenticity-determinable information record, which uses the authenticity-determining medium of any one of the nineteenth to twenty-third inventions, and thus can perform its own authenticity determination. the

Brief description of the drawings

Fig. 1 is a diagram showing a basic layered structure of a medium for judging authenticity according to the present invention. the

Fig. 2 is a diagram showing another layered structure of the medium for judging authenticity according to the present invention. the

Fig. 3 shows an application example of the medium for judging authenticity of the present invention. the

Fig. 4 shows another application example of the medium for judging authenticity of the present invention. the

FIG. 5 is a diagram showing a method of authenticity determination using the authenticity determination medium of the present invention. the

Fig. 6 is a diagram showing that the medium for judging authenticity according to the present invention is made into a label shape. the

Fig. 7 is a view showing that the authenticity determination medium of the present invention is formed into a transfer sheet. the

Fig. 8 is a diagram showing the most basic layered structure of another medium for judging authenticity according to the present invention. the

Fig. 9 is a diagram showing a layered structure of another embodiment of a medium for judging authenticity according to the present invention. the

Fig. 10 is a diagram showing a layered structure of a medium for judging authenticity according to another embodiment of the present invention. the

Fig. 11 is a diagram showing labels and transfer sheets suitable for applying another authentication medium of the present invention to various articles. the

Fig. 12 shows another application example of a medium for judging authenticity of the present invention. the

Fig. 13 is a diagram showing yet another example of a layered structure of a medium for authenticity determination according to the present invention. the

Fig. 14 shows a method of authenticity determination using another medium for authenticity determination of the present invention. the

Fig. 15 is a diagram showing a label and a transfer sheet suitable for applying another authentication medium of the present invention to various articles. the

Fig. 16 is a diagram showing an application example of still another medium for judging authenticity of the present invention. the

specific implementation

FIG. 1 and FIG. 2 are diagrams illustrating a layered structure of a medium for authenticity determination according to the present invention. 3 and 4 are diagrams showing examples of authenticity determination media to which the present invention is applied. Fig. 5 is a diagram showing a mode of authenticity determination by a product using the medium for authenticity determination of the present invention. Fig. 6 is a schematic view showing a label suitable for applying the authentication medium of the present invention to an object. Fig. 7 is a schematic view showing a transfer sheet suitable for applying the authentication medium of the present invention to an object. the

As shown in Fig. 1 (a), the medium 1 for judging the authenticity of the present invention basically contains the following laminated structure: on the color change layer 3 that produces different colors due to different viewing angles, it is laminated on the color change layer 3 that is heated to make the light change. The transmittance or reflectance of the film layer 2 changes. If viewed from the upper side of the drawings, the medium 1 for judging authenticity may also have a laminated structure as shown in FIG. the

The color change layer 3 can be formed using various materials, for example, it can be formed by using a pigment whose color changes depending on the viewing angle, by using a vapor-deposited film, or by using a dichroic dye. Pigments that change color due to different viewing angles can be listed: pearlescent pigments formed by laminating layers of high-refractive index silicon oxide, titanium oxide, iron oxide, etc. and low-refractive index mica. The trade name manufactured by Shiseido: Infinitsu Tokara One, the trade name manufactured by Merck (Germany): Iriogin, etc. Vapor-deposited film is formed by vapor phase method to form aluminum or other materials into a thin film. The extremely thin object has transparency and shows the so-called interference color that changes color depending on the viewing angle like an oil film floating on the water surface. . Dichroic dyes contain long-chain dye molecules that have different light absorption properties depending on the molecular axis. It absorbs light components parallel to the molecular axis and does not transmit light; specific examples include anthraquinone-based, azo-based, or disazo-based dyes. Among them, the pigment or dichroic dye that changes color due to different viewing angles can be dispersed in an appropriate binder resin, diluted with a solvent, and made into a composition for coating, which is printed by screen printing, gravure, etc. Printing or known coating methods are applied to the object surface. the

The color change layer 3 constituting the medium 1 for judging authenticity may be a light selective reflective layer that reflects one of left-handed circularly polarized light or right-handed circularly polarized light in incident light. The medium 1 can be as shown in Fig. 1 (c), contains the lamination structure that there is orientation film 4 between color change layer 3 and thin film layer 2, also can be to contain sequentially laminated photoselective reflective layer 3, The lamination structure of the alignment film 4 and the thin film layer 2, but this structure is not shown in the figure. the

The medium 1 for judging authenticity is not limited to the lamination structure in which the thin film layer 2 and the color change layer 3 are laminated one by one, but may also include two color change layers 3 . As shown in Figure 1 (d), it can be a laminated structure that contains two layers of color changing layers 3B, 3A, and film layer 2 that are sequentially laminated from the lower side of the accompanying drawing, as shown in Figure 1 (e). It may be a laminated structure including a thin film layer 2 and two color changing layers 3A and 3B laminated sequentially from the lower side of the drawing. the

As shown in Figure 2 (a), the medium 1 for judging authenticity may have a laminated structure in which a color change layer such as a light selective reflective layer 3B, a retardation layer 5 and a color change layer such as 3A are sequentially laminated from the lower side . The light selective reflective layers 3B and 3A preferably contain cholesteric liquid crystal layers, and are more preferably layers that reflect circularly polarized light in the same direction as each other. In the example shown in Fig. 2 (a), on the light selective reflective layer A (symbol 3A) side, the film layer 2 can also be laminated to form a medium 1 for judging authenticity. The B (symbol 3B) side may also be laminated with a thin film layer 2 to constitute a medium 1 for authenticity determination. the

Here, the retardation layer 5 is a layer that birefringently enters light and produces a different phase depending on the direction of polarization, so as to have a retardation. Birefringence is a phenomenon that occurs because the refractive index of a medium is not uniform according to the direction of polarization. It is known that the phase difference σ of light passing through the medium is σ=2π(ne-no)d/λ. Here, ne is the refractive index of extraordinary rays, no is the refractive index of ordinary rays, d is the thickness of the medium, and λ is the wavelength of light. That is, the phase difference σ is related to the wavelength λ of light with respect to a d-medium having a certain thickness. When right-handed circularly polarized light of wavelength λ=2(ne-no)d is incident on the retardation layer 5 , the right-handed circularly polarized light is transmitted to generate a phase difference σ=π (ie, 1/2 wavelength). Therefore, the incident right-handed circularly polarized light is converted into left-handed circularly polarized light and emitted, and the incident left-handed circularly polarized light is converted into right-handed circularly polarized light and emitted. The above retardation layer 5 may be composed of a nematic liquid crystal layer or a nematic liquid crystal layer and a transparent base film as described later, in addition to the transparent base film formed of a stretched plastic film. the

In the color change layer 3 having a laminated structure in which two color change layers B and A (symbols 3B and 3A) are laminated via a retardation layer 5, when the color change layers 3B and 3A are very thin, the entirety is transparent , so objects on the opposite side can also be seen through the laminate. the

It can be arranged that the two color change layers contain light selective reflective layers B and A (symbols 3B and 3A), both of which can reflect right-handed circularly polarized light. As shown in Figure 2(b), for the above basic elements, the natural light is incident on the side of the light selective reflective layer A (symbol 3A). The role of layer A (symbol 3A) is to selectively reflect only right-handed circularly polarized light, and the reflected light (right-handed circularly polarized light) can be observed through a right-handed circular polarizer. the

In addition, left-handed circularly polarized light of natural light entering from the side of the light selective reflective layer A (reference number 3A) is transmitted through the light selective reflective layer A (reference number 3A). The transmitted left-handed circularly polarized light is transformed into right-handed circularly polarized light through the retardation layer 5 ("left → right" in the figure means the conversion from left-handed circularly polarized light to right-handed circularly polarized light). The converted right circularly polarized light is reflected by the light selective reflective layer B (symbol 3B). The reflected light (right-handed circularly polarized light) passes through the retardation layer 2 again, and is transformed into left-handed circularly polarized light ("right→left" in the figure means that right-handed circularly polarized light is converted into left-handed circularly polarized light). The converted left-handed circularly polarized light is emitted through the light selective reflective layer A (reference number 3A), and the emitted light (left-handed circularly polarized light) can be observed through a left-handed circular polarizer. At this time, by making the two light-selective reflective layers A and B (symbols 3A and 3B) the central wavelengths of the reflected lights are different, when observing with a right-handed circular polarizer and when observing with a left-handed circular polarizer, the light The colors are different, so double confirmation can be performed, and authenticity can be judged more accurately. the

The authentication medium of the present invention is preferably laminated with an appropriate base material and used as a base material capable of authenticity determination. the

As shown in Figure 3 (a), on a suitable substrate 12, a color change layer such as a light selective reflective layer 3 and a film layer is sequentially laminated from the substrate 12 side; as shown in Figure 3 (b), in On a suitable substrate 12, a film layer 2 and a color change layer such as a light selective reflective layer 3 are sequentially laminated from one side of the substrate 12; or as shown in Figure 3 (c), on a suitable substrate 12, The thin film layer 2, the orientation film 4, and the color change layer such as the light selective reflective layer 3 etc. are sequentially laminated from the side of the base material 12; These authentication-determinable substrates 11 are obtained by laminating the authenticity-determining medium 1 described with reference to FIGS. 1( a ) to 1 ( c ) on a substrate 12 . In addition, on the appropriate substrate 12, the color change layer such as the light selective reflective layer 3, the alignment film 4, and the thin film layer 2 are sequentially laminated from the substrate 12 side to obtain the substrate 11 that can determine the authenticity, but This structure is not shown. In addition to the above, the authenticity-determinable substrate 11 is also obtained by laminating the authentication medium 1 described with reference to FIG. 1( d ) and FIG. 1( e ) on the substrate 12 . the

The example of the base material 11 that can determine the authenticity shown in FIG. On the base material 12, the color change layer such as the light selective reflective layer 3 and the film layer 2 is sequentially laminated from the base material 12 side. The resulting laminated structure of layer B (symbol 3B), retardation layer 5, and light selective reflective layer A (symbol 3A). The film layer 2, the light selective reflective layer A (symbol 3A), the retardation layer 5, and the light selective reflective layer B (symbol 3B) are laminated sequentially from the base material 12 side on the base material 12, which can also be judged in the present invention. True and false substrate 11, but the structure is not shown. the

As shown in Figure 4 (b), the substrate 11 that can determine the authenticity can include a color change layer such as a light selective reflective layer B (symbol 3B), a pattern shape, and a color change layer laminated sequentially from the substrate 12 side on the substrate 12. A laminated structure of a color change layer such as a light selective reflective layer A (symbol 3A) and a thin film layer 2. This is a modified structure obtained by laminating the authentication medium 1 described with reference to FIG. 1( d ) on the substrate 12 . As described above, when the color change layer 3 includes two or more layers, at least one layer may have a pattern shape. In addition, the substrate 11 that can determine authenticity may also include a film layer 2, a pattern-shaped color change layer such as a light selective reflective layer A (symbol 3A), and a light selective reflective layer laminated sequentially from the substrate 12 side. Laminate structure of B (symbol 3B). In the above cases, the lamination order of the pattern-shaped light selective reflective layer A (symbol 3A) and the light selective reflective layer B (symbol 3B) can be alternated. the

The thin film layer 2 in the medium 1 for judging the authenticity of the present invention is preferably changed by heating its light transmittance or reflectance. As long as the material can be melted or evaporated by heating, or a phase change occurs, the heated part and the untreated part In the heating part, the material that generates the pattern due to the difference in light transmittance or reflectance can be any material, for example, it can be a metal with a lower melting point such as Te, Sn, In, Al, Bi, Pb or Zn. , alloys of these metals or compounds of these metals such as Te-carbide and the like. The forming method of the thin film layer 2 is different depending on the material, and can be carried out by vacuum evaporation, sputtering, or electroplating. The thickness of the film layer 2 is about 10 μm-1000 μm. the

In the medium 1 for judging authenticity of the present invention, the light selective reflectivity layer 3 is a layer formed of a material having light selective reflectivity for reflecting either left-handed circularly polarized light or right-handed circularly polarized light in incident light. , such as a layer containing a cholesteric liquid crystal layer. The light selective reflective layer 3 can be formed, for example, by printing a solvent solution of a cholesteric liquid crystal by various printing methods and drying it, or at this time using a polymerizable cholesteric liquid crystal to prepare an ultraviolet polymerizable composition. The obtained ultraviolet polymerizable composition is applied and dried by various printing methods, and then irradiated with ultraviolet rays to be polymerized. the

When forming two or more layers of light selective reflective layer 3, it is preferable that the center wavelength of the reflected light of each layer is different. For this reason, it is preferable to make the thickness of each layer different, or to use materials with different pitches (helical _pitch ) as constituents. layer material. When the above-mentioned polymerizable cholesteric liquid crystal is used to prepare the ultraviolet polymerizable composition and form the light selective reflection layer, the polymerizable nematic liquid crystal and the chiral reagent can be used in combination. At this time, by preparing and using the polymerizable nematic liquid crystal and the chiral reagent Ultraviolet compositions having different compounding ratios of (kailar agent) can form cholesteric liquid crystal layers having different pitches.

Examples of polymerizable cholesteric liquid crystal materials include compounds represented by the following general formula (1) or compounds represented by formulas (2) to (10). These exemplified compounds may be monomers, oligomers or polymers. Two or more compounds shown in general formula (1) can be used in combination, or can be selected from compounds shown in above-mentioned (1) and compounds shown in formula (2)-formula (10), two or two Use the above together. the

In the above general formula (1), R ¹ and R ² represent hydrogen or methyl respectively, and X is preferably chlorine or methyl. The range of a and b representing the alkylene chain length of the spacer group of the compound represented by the general formula (1) is preferably in the range of 2 to 9 from the viewpoint of expressing liquid crystallinity.

In the above formula (11), R ³ represents hydrogen or methyl. In the above (11) and formula (12), Y is any one of the formulas (i)-(xxiv) shown in the following formulas (14) and (15). In the above formula (11) to formula (13), c, d and e representing the chain length of the alkylene group are preferably in the range of 2 to 9 from the viewpoint of expressing liquid crystallinity.

Chemical 1

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Chemical 14

Chemical 15

Above-mentioned cholesteric liquid crystal material and chiral reagent can be mixed together with ultraviolet polymerization initiator, and solvent or diluent as required, and wherein an example is with cholesteric liquid crystal material: chiral reagent: ultraviolet polymerization initiator=100: Mixing at a ratio of 5:5 (mass basis), the mixed powder can be dissolved in a solvent such as toluene to prepare a solution for coating with a concentration of about 30% by mass. The compounding ratio can be appropriately determined according to the type of cholesteric liquid crystal material, chiral reagent, or ultraviolet polymerization initiator used, the coating method or coating machine, or the desired coating amount. the

The alignment film 4 that can be laminated with the light selective reflective layer 3 may be composed of any substance as long as it is generally used as an alignment film such as polyvinyl alcohol resin (PVA) or polyimide resin. The alignment film 4 can be formed by applying a solvent solution of these resins on a film or an appropriate layer usually by an appropriate coating method, drying it, and then rubbing it with a cloth, a brush, etc. to form a rubbing alignment. When a film or the like is made of a stretched plastic sheet, the surface already has orientation, so lamination of the orientation film 4 can be omitted. the

The retardation layer 5 can be formed using, for example, nematic liquid crystals, and can be formed by various printing methods using an ink composition containing nematic liquid crystals, preferably an ink composition containing a solvent solution of nematic liquid crystals, and can be used in addition to being used alone. It is formed by laminating the surface of a transparent film with its own orientation, or laminating an orientation film on the surface of the film. The stretched plastic film itself can also be used as the retardation layer 5, and the retardation layer is laminated on the above-mentioned plastic film, or the retardation layer is laminated on the plastic film through the orientation film 6, and the whole can be used as the retardation layer 5. Function. the

The substrate 12 , which is the laminated object of the medium 1 used to determine the authenticity of the present invention, can be made of paper, plastic or metal foil, or their composites. It is also possible to process the base material 12 into forms such as the above-mentioned cards such as credit cards or debit cards that may cause various troubles due to forgery or tampering, various securities, commuter tickets of transportation agencies, or ID cards. Processing such as printing, lamination, or embossing can be performed on the above-mentioned materials, and a magnetic recording layer can be laminated or an IC chip can be embedded. In almost all cases, printing can be performed on the base material 12, and a magnetic recording layer can be laminated in many cases. the

The recording on the medium 1 for judging the authenticity of the present invention is to use a thermal head or a laser, etc., preferably a method that can be heated in a spot shape according to input information. For a film that changes the transmittance or reflectance of light by heating Layer 2 forms the desired characters or patterns, etc. Fig. 5 (a) shows the state that the recording part 13 is formed on the substrate 11 that can determine the authenticity, wherein the substrate 11 that can determine the authenticity is the medium 1 for determining the authenticity laminated on the entire substrate. As can be seen from the surface, in the illustrated example, the recording part 13 forms the English letter "DD". The authenticity-determinable substrate 11 was described with reference to FIG. 3 or FIG. 4, and it is assumed to have the laminated structure described with reference to FIG. 3(a), but of course it may be a laminated structure other than this. When it is the laminated structure described with reference to Fig. 3 (a), volatilization removes and becomes thin film layer 2 to form the narrow band shape of the English letter "DD", then the light selective reflective layer 3 of the lower layer can be seen from the removed part, and the light When the selective reflective layer 3 contains a cholesteric liquid crystal layer, the hue differs depending on the viewing angle. Therefore, the English letter "DD" has different hues depending on the viewing angle. the

The medium 1 used to determine the authenticity of the present invention can use an inkjet printer or a thermal transfer printer, etc., to implement recording by a non-thermal recording method. The recording performed by the above-mentioned non-thermal recording method is to make the light transmittance or The film layer whose reflectivity changes or/and the color changing layer which has different colors due to different viewing angles serve as the background, thereby providing anti-counterfeiting properties. In addition to recording by the above-mentioned non-thermosensitive recording method, a thermosensitive recording method such as a thermal head or laser is also used for recording, so that the medium 1 used for authenticity determination can have higher anti-counterfeit performance. the

On the substrate 11 that can determine the authenticity in the state of Fig. 5 (a), as shown in Fig. 5 (b), the stacked left-handed circular polarizing plate 14L assumes that the light-selective reflective layer 3 reflects the left-handed circular polarizer in the incident light If polarized light is used, the reflected light can be observed, and the reflected light can be seen colored according to the thickness or pitch of the light selective reflective layer 3 . At this time, as shown in FIG. 5( c ), if the right-handed circular polarizing plate 14R is superimposed, reflected light cannot be observed. the

The authenticity-determinable base material 11 shown in FIG. 5( a) is the base material 11 that can be determined by citing FIG. 4( a) to illustrate. When (symbol 3B) reflects right-handed circularly polarized light, as shown in FIG. As shown in FIG. 5(c), when the right-handed circular polarizing plate 14R is superimposed, the reflected light reflected by the light selective reflective layer A (symbol 3A) on the upper layer side can be seen. In the above two cases, according to the light selective reflectivity The thickness or pitch of layer A (symbol 3A) or B (symbol 3B) can be colored by reflected light. As mentioned above, in this case, since the color of light is different when observed with the left-handed circular polarizer 14L and when observed with the right-handed circular polarizer 14R, double confirmation can be performed and authenticity can be determined more accurately. the

In the above example, the medium 1 for judging authenticity of the present invention is laminated on the surface of the base material 12 and is the side for observation. If the base material 12 is transparent, it can be The medium 1 for authenticity determination is laminated on the non-observation side of the substrate 12 . As an example of the medium 1 for judging the authenticity of the present invention, the medium 1 for judging the authenticity of the present invention is cut into a very narrow vertical line shape of about 0.5mm-5mm, and it is aligned with the recess of the base material 12. Internally laminated, it can be embedded in substrates such as paper and used transparently. For example, using securities paper as the base material 12, if a linear medium 1 for judging authenticity is used, it will be inconspicuous in appearance or seem to be just decoration, but in fact the authenticity of the paper can be judged in the same way as above. fake. the

The medium 1 for judging authenticity of the present invention described with reference to Fig. 1 and Fig. 2, as described with reference to Fig. 6 or Fig. 7, can be easily used for authenticity judgment by being processed into the form of a label or a transfer sheet. Pseudo medium 1 of various items. the

6 relates to the form of a label. In the illustrated example, on the upper side of the base film 22 in the drawings, a color change layer such as a light selective reflective layer B (symbol 3B) is sequentially laminated from the base film 22 side. , phase difference layer 5, color change layer such as light selective reflective layer A (symbol 3A), film layer 2 and protective layer 24, and adhesive layer 23 is laminated on the lower side of base film 2, constitutes for judging authenticity media label 21. If necessary, a release sheet may be laminated on the side where the adhesive layer 23 is exposed. In the example shown in FIG. 6 , the medium 1 for judging authenticity in the example described with reference to FIG. The adhesive layer 23 may be laminated with a material other than the example described with reference to FIG. 2( a ) as the authenticity determination medium 1 . The protective layer 24 may also be omitted. It is also possible to laminate the medium 1 for judging the authenticity on the lower side of the base film 22, then laminate the adhesive layer 23 on the lower side, and laminate the medium 1 for judging the authenticity on the lower side of the base film 22. In the case of the adhesive layer 23, the protective layer 24 may be laminated on the upper side of the base film 22. the

7 relates to the form of the transfer sheet. In the illustrated example, on the lower side of the base film 22, a protective layer 24, a film layer 2, and a color change layer such as a photoselective layer are sequentially laminated from the base film 22 side. The reflective layer 3 and the adhesive layer 23 form a detachable lamination between the base film 22 and the protective layer 24, so that the light selective reflective layer 3 has a layer of light selective reflective layer A sequentially laminated from the film layer 2 side. (Symbol 3A), retardation layer 5, and light selective reflective layer B (Symbol 3B) obtained laminated structure constitutes the medium transfer sheet 31 for judging authenticity. In the example of the medium transfer sheet 31 for authentication, the medium 1 for authentication in the example described with reference to FIG. It is a medium other than the example described with reference to FIG. 2( a ). The protective layer 24 may also be omitted. When there is an adhesive on the surface of the object to be transferred, the lowermost adhesive layer 23 can be omitted. the

In the above-mentioned form of the medium label 21 for authenticity determination or the form of the medium transfer sheet 31 for determination of authenticity, the authenticity-determinable base material 11 can be used instead of each part of the medium 1 for authenticity determination. a layered structure. In this case, the authenticity-determinable substrate 11 itself is accompanied by the substrate 12, so the authenticity-determining medium label 21 and the authenticity-determining medium transfer sheet 31 have the substrate film 22 and the substrate film 22. 12 both. the

The authenticity-determining medium 1 or authenticity-determining substrate 11 of the present invention can be prepared by successively laminating each layer on a suitable permanent substrate or a temporary substrate, and the above-mentioned substrate for judging can also be used. It is manufactured in the form of a media label 21 for authenticity or in the form of a media transfer sheet 31 for authenticity determination. When the form of the media label 21 for judging authenticity is laminated with a detachable sheet, the detachable sheet can be peeled off to make the adhesive layer 23 stick to the adhered article. In addition, it is used for media transfer for judging authenticity The form of the sheet 31 can be used by bonding the side of the adhesive layer 23 to the side of the object to be bonded, and then peeling off the base film 22 . the

The substrate film 22 constituting the above-mentioned media label 21 for judging authenticity and media transfer sheet 31 for judging authenticity preferably has mechanical strength, solvent resistance and resistance to processing during manufacture of the label 21 and the transfer sheet 31. heat resistance. The material is not limited depending on the purpose of use, but film-like or sheet-like plastic is preferable. Such as polyethylene terephthalate (PET), polycarbonate, polyvinyl alcohol, polysulfone, polyethylene, polypropylene, polystyrene, polyarylate, triacetyl cellulose (TAC), bis Various plastic films such as acetyl cellulose, polyethylene/vinyl alcohol, etc. the

The adhesive layer 23 constituting the media label 21 for authenticity determination and the media transfer sheet 31 for verification of authenticity can use heat-sensitive adhesives or pressure-sensitive adhesives. the

The protective layer 24 constituting the media label 21 for authenticity judgment and the media transfer sheet 31 for authenticity judgment described above is not only a thermoplastic resin or a thermosetting resin used as a binder resin in ink or paint, Ionizing radiation curable resins such as ultraviolet curable resins and electron beam curable resins can also be used. the

[Example 1]

Using a polymerizable cholesteric liquid crystal solution, gravure printing was performed on the surface of a PET film with a thickness of 50 μm, dried, and then irradiated with ultraviolet rays to form a cholesteric liquid crystal layer with a thickness of 2.2 μm on the entire surface. The polymerizable cholesteric liquid crystal solution used here is a polymerizable nematic liquid crystal (manufactured by BASF Co., Ltd., trade name: "Pariokara-LC242"), a chiral reagent (manufactured by BASF Co., Ltd., trade name: "Pariokara-LC242"), LC756 ") and ultraviolet polymerization initiator mixed 20% solution (solvent is toluene), the proportioning of polymerizable nematic liquid crystal/chiral reagent is 95.5/4.5, and ultraviolet polymerization initiator is mixed 5% with respect to polymerizable nematic liquid crystal. the

On the formed cholesteric liquid crystal layer, form a polyester resin-based adhesion-promoting coating by gravure printing, and form a Sn film layer with a thickness of 250 nm on the adhesion-promoting coating by evaporation, and then pass through gravure printing on the Sn thin film. A polyurethane resin-based protective layer was formed on the layer to obtain a film for thermosensitive recording. the

Printing was performed from the protective layer side of the obtained thermosensitive recording film with a thermal head, and the hue of the cholesteric liquid crystal layer at the printed portion of the printed thermosensitive recording film changed depending on the viewing angle. Observed by stacking right-handed circular polarizers, the printed part will be colored green, and replaced by left-handed circular polarizers, the color will disappear. the

[Example 2]

On the surface of the non-patterned PET film of the heat-sensitive recording film obtained in Example 1, a release paper was superimposed, an adhesive was coated thereon, and a protective layer, a Sn thin film layer, and an adhesion-promoting coating layer were sequentially laminated. , cholesteric liquid crystal layer, PET film, adhesive layer and release paper to form a laminated structure, and then engraved into a prescribed shape to obtain a label-shaped thermal recording film. the

[Example 3]

The heat-sensitive adhesive layer was laminated on both sides of the heat-sensitive recording film obtained in Example 1, processed into a line shape with a width of 2 mm, and sandwiched between paper layers to obtain a line-shaped interleaved paper. the

[Example 4]

Letters such as cautions were printed on the side of the PET film of the heat-sensitive recording film obtained in Example 1 on which no pattern was formed to prepare a prepaid card. the

[Example 5]

A Sn thin film layer with a thickness of 250 nm was formed on the surface of the PET film with a thickness of 12 μm by vapor deposition. Apply a PVA solution (PVA resin manufactured by Kuraray Co., Ltd., model: "110", used as a 5% aqueous solution (transparent)) on the formed Sn thin film layer, let it dry, and then perform rubbing treatment to form an alignment film . Using the same polymerizable cholesteric liquid crystal solution as used in Example 1, gravure printing was carried out on the alignment film, dried, and then irradiated with ultraviolet rays to form a cholesteric liquid crystal layer with a thickness of 2.2 μm on the entire surface, A film for thermosensitive recording was obtained. the

Printing was performed from the PET film side of the obtained thermosensitive recording film using a thermal head, and the hue of the cholesteric liquid crystal layer at the printed portion of the printed thermosensitive recording film changed depending on the viewing angle. When the right-handed circular polarizer is stacked and observed, the printed part is colored green, but the color disappears when replaced with a left-handed circular polarizer. the

The same effect as above can be obtained by replacing the PET film with a film with a thickness of 50 μm to obtain a film for thermosensitive recording, and then printing from the cholesteric liquid crystal layer side. the

[Example 6]

The same as that used in Example 1, using a polymerizable cholesteric liquid crystal solution, gravure printing was performed on one side of a PET film with a thickness of 50 μm, allowed to dry, and then irradiated with ultraviolet rays to form a film with a thickness of 2.2 μm on the entire surface. Cholesteric liquid crystal layer (A). Then, using a polymerizable cholesteric liquid crystal solution different from that used to form the cholesteric liquid crystal layer (A), a cholesteric liquid crystal layer (B) was formed on the surface of the above-mentioned PET film where the cholesteric liquid crystal layer (A) was not formed. ). Then, a Sn thin film layer with a thickness of 250 nm was formed on the cholesteric liquid crystal layer (B) by vapor deposition to obtain a thin film for thermosensitive recording. The polymeric cholesteric liquid crystal solution used when forming the cholesteric liquid crystal layer (B) is except that the proportioning of polymerizable nematic liquid crystal/chiral reagent is 95.5/4.5, and when forming the cholesteric liquid crystal layer (A) The polymerizable cholesteric liquid crystal solution used was the same. the

Using a thermal head to print on the obtained thermosensitive recording film, the hue of the cholesteric liquid crystal layer at the printed portion changes according to the viewing angle of the printed thermosensitive recording film. When the right-handed circular polarizer is stacked and observed, the printed part is colored green, but when replaced with a left-handed circular polarizer, the color is red. the

Next, FIG. 8 is a diagram showing a basic layered structure of another medium for judging authenticity of the present invention. 9 and 10 are diagrams showing another preferred embodiment of a medium for judging authenticity of the present invention. Fig. 11 is a diagram showing a mode in which another authentication medium of the present invention is suitable for an object. Fig. 12 is a diagram showing another example of a medium for judging authenticity to which the present invention is applied. the

As shown in Figure 8 (a), the most basic composition of another medium 41 for judging authenticity of the present invention is to contain the following lamination structure: two layers of light selective reflection layers A and B (symbols 43A and 43B) via The retardation layer 42 is laminated. Both layers of light selective reflection layers A and B (43A and 43B) are layers formed from a material having light selective reflectivity for reflecting left-handed circularly polarized light or right-handed circularly polarized light in the incident light, more preferably from Seen from one side, the authentication medium 41 reflects circularly polarized light in the same direction, and includes, for example, a cholesteric liquid crystal layer. In addition, the two light selective reflection layers A and B (symbols 43A and 43B) preferably have different central wavelengths of reflected light. the

The phase difference layer 42 laminated between the two light selective reflection layers A and B is a layer in which incident light is birefringent and has a different phase depending on the direction of polarization, so as to have a phase difference. Birefringence is a phenomenon that occurs because the refractive index of a medium is not uniform according to the direction of polarization. It is known that the phase difference σ of light passing through the medium is σ=2π(ne-no)d/λ. Here, ne is the refractive index of extraordinary rays, no is the refractive index of ordinary rays, d is the thickness of the medium, and λ is the wavelength of light. That is, for a medium with a certain thickness d, the phase difference σ is related to the wavelength λ of light. When right-handed circularly polarized light of wavelength λ=2(ne-no)d is incident on the retardation layer 42 , the right-handed circularly polarized light is transmitted to generate a phase difference σ=π (ie, 1/2 wavelength). Therefore, the incident right-handed circularly polarized light is converted into left-handed circularly polarized light and emitted, and the incident left-handed circularly polarized light is converted into right-handed circularly polarized light and emitted. The above retardation layer 42 may be composed of a nematic liquid crystal layer or a nematic liquid crystal layer and a transparent base film, as described later, in addition to the transparent base film formed of a stretched plastic film. the

The above-mentioned basic configuration, that is, a laminated body of a laminated structure in which two light selective reflection layers A and B (symbols 43A and 43B) are laminated via a retardation layer 42, wherein each light selective reflection layer A and B is very thin , the whole is transparent, so it is also possible to see through to the opposite side through this laminated body. As will be described later, the laminated structure of this basic constitution may have a modified structure. the

Assume that the two light selective reflection layers A and B (symbols 43A and 43B) both reflect right-handed circularly polarized light. As shown in Figure 8(b), for the above basic elements, natural light is incident on the side of the light selective reflection layer A (symbol 43A). The role of (symbol 43A) is to selectively reflect only right-handed circularly polarized light, and the reflected light (right-handed circularly polarized light) can be observed through a right-handed circular polarizer. the

The left-handed circularly polarized light of natural light incident from the side of the selective reflection layer A (symbol 43A) is transmitted through the selective reflection layer A (symbol 43A). The transmitted left-handed circularly polarized light is transformed into right-handed circularly polarized light by the phase difference layer 42 ("left → right" in the figure means the conversion from left-handed circularly polarized light to right-handed circularly polarized light). The converted right circularly polarized light is reflected by the light selective reflection layer B (symbol 43B). The reflected light (right-handed circularly polarized light) passes through the retardation layer 42 again and is converted into left-handed circularly polarized light ("right→left" in the figure indicates conversion from right-handed circularly polarized light to left-handed circularly polarized light). Since the converted left-handed circularly polarized light is emitted through the light selective reflection layer A (reference number 43A), the emitted light (left-handed circularly polarized light) can be observed through a left-handed circular polarizer. the

Therefore, if the basic composition of the medium 41 for judging the authenticity of the present invention described with reference to FIG. A left-handed circular polarizer can observe the light passing through the above-mentioned different optical paths, and the two layers of light selective reflection layers A and B (symbols 43A and 43B) preferably have different central wavelengths of the reflected light, so when using a right-handed circular polarizer to observe Since the color of the light is different from that observed with a left-handed circular polarizer, double confirmation can be performed, and the authenticity identification function can be improved. the

The medium 41 for judging authenticity of the present invention can be used alone on various items, and can also be used in combination with other authenticity-identifying methods. the

FIG. 9 is a diagram showing an example in which the basic elements described with reference to FIG. 8 are applied to a hologram. As shown in Figure 9 (a), the medium 41 for judging authenticity of the present invention has the following laminated structure: a light selective reflection layer A (symbol 43A) is laminated on one side of a transparent base film 421, and a transparent base film On the opposite side of the material film 421 on which the optical selective reflection layer A (symbol 43A) is laminated, the optical selective reflection layer B (symbol 43B), the hologram forming layer 44 and the reflective layer 45 are sequentially laminated. the

As shown in Figure 9 (b), the medium 41 for judging the authenticity of the present invention can have the following lamination structure: on one side of the transparent base film 421, the retardation layer 42 and the light selective reflection layer A (symbol 43A) are sequentially laminated ), on the opposite side of the transparent base film 421 where the retardation layer 42 and the selective reflection layer A (symbol 43A) are laminated, the selective reflection layer B (symbol 43B), the hologram forming layer 44 and the reflective Layer 45. In the laminate structure described with reference to FIG. 9( a ), the transparent base film 421 has both the function of the support and the function of the retardation layer 42 . The laminated body shown here in which the light selective reflection layer A (symbol 43A), retardation layer 42, transparent base film 421, and light selective reflection layer B (symbol 43B) are sequentially laminated is also used for judging the authenticity of the present invention. One of the variants of the basic laminate structure of the medium 41 . the

Or as shown in FIG. 10 , the medium 41 for judging authenticity of the present invention may have the following laminated structure: there is an orientation film A (symbol 46A) between the transparent base film 421 and the retardation layer 42, There is an alignment film B (symbol 46B) between the material thin film 421 and the light selective reflection layer B (symbol 43B). Here, the light selective reflection layer A (symbol 43A), retardation layer 42, alignment film A (symbol 46A), transparent base film 421, alignment film B (symbol 46B) and light selective reflection layer B (symbol 46B) are sequentially laminated here. The laminated body of 43B) is also one of the variants of the basic laminated structure of the authenticity determination medium 41 of the present invention. the

In the preferred embodiment of the present invention described with reference to Fig. 9 and Fig. 10--in the medium 41 for judging authenticity, the above-mentioned basic elements have see-through, so the hologram formation layer and the reflective layer by the back side can be ensured. Visibility of the generated hologram. In addition, the two layers of light selective reflection layers A and B (43A and 43B) both have light selective reflectivity to reflect left-handed circularly polarized light in incident light, or have light-selective reflectivity to reflect right-handed circularly polarized light, and each reflected light Different colors can be observed when using a right-handed circular polarizer or a left-handed circular polarizer when the center wavelength is different. Therefore, when used as the medium 41 for judging authenticity, in addition to the difficulty in manufacturing based on the appearance of the hologram and the characteristics of the hologram, it is possible to perform dual-means authentication by using a right-handed circular polarizer and a left-handed circular polarizer respectively. False determination, for the article to which the medium for determining authenticity is applied, authenticity identification can be performed with higher reliability. the

In the medium 41 for judging the authenticity of the present invention, the two layers of light selective reflection layers A and B (43A and 43B) are selected by having one of left-handed circularly polarized light or right-handed circularly polarized light in the reflected incident light. The layer formed of a reflective material includes, for example, a cholesteric liquid crystal layer. the

The two light selective reflection layers A and B (43A and 43B) can be formed by applying a solvent solution of cholesteric liquid crystals by various printing methods and drying them, or at this time, using polymerizable cholesteric liquid crystals to prepare ultraviolet polymerizable combinations It is formed by applying the obtained ultraviolet polymerizable composition by various printing methods, drying it, and irradiating ultraviolet rays to polymerize it. the

In order to make the two light selective reflection layers A and B ( 43A and 43B ) have different center wavelengths of reflected light in each layer, it is preferable that the thickness of each layer is different, or the pitch of each layer is different. As described above, when using polymerizable cholesteric liquid crystals to prepare ultraviolet polymerizable compositions and form light selective reflection layers, polymerizable nematic liquid crystals and chiral agents are used in combination. At this time, by using polymerizable nematic liquid crystals and The ultraviolet polymerizable compositions with different proportions of chiral reagents can form cholesteric liquid crystal layers with different pitches. the

The transparent base film 421 may be made thinner, and preferably has mechanical strength, solvent resistance, and heat resistance that are resistant to processing when producing a medium for authenticity determination. It is selected according to the purpose of use and is not particularly limited, but it is preferably made of film-like or sheet-like plastic. For example: polyethylene terephthalate (PET), polycarbonate, polyvinyl alcohol, polysulfone, polyethylene, polypropylene, polystyrene, polyarylate, triacetyl cellulose (TAC ), diacetyl cellulose, polyethylene/vinyl alcohol and other plastic films. the

An alignment film may be laminated on one or both sides of the transparent base film 421 as needed. The alignment film may be composed of any substance as long as it is generally used as an alignment film such as polyvinyl alcohol resin (PVA) or polyimide resin. The alignment film is formed by applying a solvent solution of these resins on the transparent base film 421 by an appropriate coating method, drying it, and then rubbing it with a cloth, a brush, or the like to form a rubbing alignment. When the transparent base film 421 is made of a stretched plastic sheet, since its original surface has orientation, lamination of an orientation film can be omitted. the

The retardation layer 42 can be formed using, for example, nematic liquid crystals, and can be formed by various printing methods using an ink composition containing nematic liquid crystals, preferably an ink composition containing a solvent solution of nematic liquid crystals, and can be used in addition to being used alone. The surface of the transparent base film 421 having orientation itself is laminated, or the surface of the base film 421 is laminated via the orientation film 46 . If the transparent base film 421 is also a stretched plastic film, it can also be used as the phase difference layer 42. The above-mentioned phase difference layer 42 is laminated on the transparent base film 421, or the transparent base film 421 is laminated via an orientation film 46. The retardation layer 42 and the like may function as the retardation layer 42 as a whole. the

The hologram forming layer 44 is formed by forming fine concavities and convexities of a three-dimensional hologram on one surface of a layer containing a transparent resin material. the

As the transparent resin material constituting the hologram forming layer 44, various thermoplastic resins, thermosetting resins, or ionizing radiation curable resins can be used. Thermoplastic resins include acrylic resins, acrylamide resins, nitrocellulose resins, or polystyrene resins, etc. Thermosetting resins include unsaturated polyester resins, acrylic polyurethane resins, epoxy-modified acrylic resins, epoxy-modified Sexual unsaturated polyester resin, alkyd resin, or phenolic resin, etc. One or more of these thermoplastic resins and thermosetting resins can be used. One or more of these resins can be crosslinked using various isocyanate resins, or mixed with various curing catalysts, metal bases such as cobalt naphthenate, or zinc naphthenate, or mixed with a curing agent that initiates polymerization by heat or ultraviolet light. Peroxides such as benzoyl peroxide and methyl ethyl ketone peroxide, benzophenone, acetophenone, anthraquinone, naphthoquinone, azobisisobutyronitrile, or diphenylsulfide. Ionizing radiation curable resins include: epoxy acrylate, urethane acrylate, acrylic modified polyester, etc., and a crosslinked structure can be introduced into the above ionizing radiation curable resins, or monofunctional resins can be used in combination to adjust viscosity. Monomer or polyfunctional monomer or oligomer, etc. the

When using the above-mentioned resin material to form the hologram forming layer 44, it can be directly formed by developing by carrying out hologram interference exposure on the photosensitive resin material, and also can use a pre-made three-dimensional hologram or its replica or their plated mold. etc. are used as a replica mold, and the shape is formed by pressing a layer of the above-mentioned resin material on the mold surface. When using a thermosetting resin or an ionizing radiation curable resin, the uncured resin is closely bonded to the mold surface, then cured by heating or ionizing radiation, and peeled off after curing, so that the cured transparent One side of the layer of the resin material forms fine concavities and convexities of the three-dimensional hologram. The pattern shape is formed by the same method, and the patterned diffraction grating formation layer having a diffraction grating is also included in the hologram formation layer 44. The hologram forming layer and the diffraction grating forming layer are collectively referred to as a light diffraction structure layer. the

The reflective layer 45 formed along the fine concavities and convexities of the stereo hologram may be either a reflective metal thin film or a transparent layer having a different refractive index from the hologram forming layer 44. When the former is used, an opaque hologram can be obtained. , when using the latter, transparent holograms can be obtained. All of the above are reflective holograms that can improve visibility when viewed from the observer side by illumination. the

Materials that make up the reflective metal thin film can be used: Al, Cr, Ti, Fe, Co, Ni, Cu, Ag, Au, Ge, Mg, Sb, Pb, Cd, Bi, Sn, Se, In, Ga or Rb Metals such as metals or oxides or nitrides of these metals can be used to form a reflective metal thin film by using one of them or combining multiple types. Among them, Al, Cr, Ni, Ag, or Au are particularly preferable, and the film thickness thereof is preferably 1 nm to 10,000 nm, more preferably 2 nm to 200 nm. the

The material constituting the transparent layer having a different refractive index from that of the hologram forming layer 44 includes a transparent material having a different refractive index from the resin material of the hologram forming layer. The optical refractive index of the transparent material may be larger or smaller than that of the resin of the hologram forming layer, and the optical refractive index difference with the hologram forming layer 44 is preferably 0.1 or more, more preferably 0.5 or more, particularly preferably 1.0 or above. Specific materials preferably used include titanium oxide (TiO ₂ ), zinc sulfide (ZnS), Cu·Al composite metal oxide, and the like. A metal thin film having a thickness of 20 nm or less also has transparency, and therefore can also be used as a material constituting a transparent layer having a different optical refractive index from that of the hologram forming layer 44 .

Any material may be used to form the reflective layer 45 , and the reflective layer 45 may be formed by known methods such as sublimation, vacuum deposition, sputtering, reactive sputtering, ion plating, or electroplating. the

As explained with reference to Fig. 11, by processing the medium 41 for judging authenticity of the present invention described with reference to Figs. Easily applied to various items. the

Fig. 11 (a) relates to the form of the label, and the illustrated example is that an adhesive layer 52 is laminated on the reflective layer 45 side of the medium 41 (Fig. 9 (b)) for judging the authenticity, constituting the Authentic media label 51 . Wherein, the medium 41 for judging authenticity contains the following lamination structure: one side of the transparent base film 421 is laminated with a phase difference layer 42 and a light selective reflection layer A (symbol 43A), and a transparent base film 421 is laminated with a On the opposite side of the retardation layer 42 and the light selective reflection layer A (symbol 43A), the light selective reflection layer B (symbol 43B), the hologram forming layer 44 , and the reflective layer 45 are laminated. It is not limited to the above-mentioned laminated structure, and can also be other laminated structures described with reference to Fig. 8-Fig. 10. the

Fig. 11 (b) relates to the form of the transfer sheet, and the illustrated example is that an adhesive layer 52 is laminated on the side of the reflective layer 45 of the medium 41 (Fig. The peelable surface 54a of the peelable substrate 54 is laminated on one side of the layer A (symbol 43A) to constitute the medium transfer sheet 53 for authentication. Wherein, the medium 41 for judging authenticity contains the following lamination structure: one side of the transparent substrate film 421 is laminated with a retardation layer 42 and a light selective reflection layer A (symbol 43A) sequentially, and a phase difference layer A (symbol 43A) is laminated on the transparent substrate 421. On the opposite side of the difference layer 42 and the light selective reflection layer A (symbol 43A), a light selective reflection layer B (symbol 43B), a hologram forming layer 44 , and a reflective layer 45 are laminated in this order. It is not limited to the above-mentioned laminated structure, and other laminated structures described with reference to FIGS. 8-10 are also possible. the

When using a right-handed circular polarizer to observe the medium 41 for judging authenticity of the present invention and when using a left-handed circular polarizer to observe, in order to make the effect of reflected light of different colors visible, or/and on the lower layer side When laminating the hologram forming layer 44 or the reflective layer 45, in order to further improve the visibility of the hologram, it is preferable to laminate a dark layer such as a black resin layer on the lower side of each layer. When the adhesive layer 52 is laminated on the side of the lower layer as described with reference to FIG. 11 , a dark layer may be laminated between the reflective layer 45 and the adhesive layer 52, or a dark adhesive colored in a dark color such as black may be used instead of another layer. The combined dark layer constitutes the adhesive layer 52. the

The authentication medium 41 of the present invention is preferably applied to various articles in the form of the above-mentioned authenticity medium label 51 or the authenticity medium transfer sheet 53 . The form of the media label 51 for judging the authenticity is used by sticking the adhesive layer 52 on one side of the adherend, and the form of the medium transfer sheet 53 for judging the authenticity is by pasting the adhesive layer on the adherend. object side, and then the peelable substrate 54 is peeled off for application. the

FIG. 12 is a diagram for explaining the application of the authenticity determination medium 41 mainly for sheet objects. 12( a ) shows an authenticity-determinable information recording body 55 formed by laminating an authenticity-determining medium 41 on a part of the surface of an information recording body 56 . The information recording body 56 is a sheet-like object with a base material such as paper or plastic sheet. In the illustrated example, information such as the amount of money used as securities, the name of the issuing company, precautions, etc. or color text is formed by printing or the like. 57 and record. the

What Fig. 12 (b) shows is that the medium 41 for judging the authenticity is pre-built in the sheet to form a visible structure; on paper or plastic sheets, etc., form a recessed opening 59 that does not pass through, by The medium 41 for authenticity determination can be seen through the opening 59. In order to easily apply the medium 41 for determination of authenticity, an example is to cut it into a very narrow vertical line in the figure of about 0.5mm×5mm. When applied to paper, when laminating multiple layers of paper, openings 59 are provided on the layer constituting the surface layer, and a linear medium 41 for judging authenticity is sandwiched between the layers of the sheet. The linear media 41 for judging the authenticity can be colored in a dark color on one side of the base material or the like in order to improve the visibility when circularly polarized light is irradiated. In this state, in order to ensure the adhesiveness between the linear authentication medium 41 and the sheet, an adhesive layer, preferably a heat-sensitive adhesive layer, may be laminated on one or both sides. The medium 41 for judging authenticity is applied to the above-mentioned sheet, and can be used in information records, especially securities or other printed matter with economic value. the

[Example 7]

Using the polymerizable cholesteric liquid crystal solution (A), gravure printing was performed on the surface of a PET film with a thickness of 50 μm, dried, and then irradiated with ultraviolet rays to form a cholesteric liquid crystal layer (A) with a thickness of 2.2 μm on the entire surface. In addition, on the opposite side of the PET film on which the cholesteric liquid crystal layer was formed, gravure printing was performed using another polymerizable cholesteric liquid crystal solution (B), dried, and then irradiated with ultraviolet rays to form a 2.2 μm-thick film on the entire surface. Cholesteric liquid crystal layer (B). the

The polymerizable cholesteric liquid crystal solution (A) used above is a polymerizable nematic liquid crystal (manufactured by BASF Co., Ltd., trade name: "Pariokara-LC242"), a chiral reagent (manufactured by BASF Co., Ltd., trade name: "Pariokara - LC756 ") and 20% solution (solvent is toluene) mixed with ultraviolet polymerization initiator, wherein, the ratio of polymerizable nematic liquid crystal/chiral reagent is 95.3/4.7, and ultraviolet polymerization initiator is relative to polymerizable nematic Liquid crystal mix 5%. In the polymerizable cholesteric liquid crystal solution (B), the ratio of the polymerizable nematic liquid crystal/chiral reagent is 96.2/3.8, except that it is the same as the previous polymerizable cholesteric liquid crystal solution (A). the

Coating a transparent ultraviolet curable resin composition on the cholesteric liquid crystal layer (B) side of the composite film having the laminated structure of the obtained cholesteric liquid crystal layer (A)/PET film/cholesteric liquid crystal layer (B) , irradiating ultraviolet rays while it is in contact with the mold surface of the mold for duplicating the stereo hologram, curing the transparent ultraviolet curable resin composition to form a stereo hologram, and then vacuum-depositing TiO ₂ on the surface formed with the stereo hologram , forming a transparent reflective layer with a thickness of 500nm to obtain a medium for judging authenticity.

Gain is used for judging the authenticity of the medium and observes from the cholesteric liquid crystal layer (A) side and changes the angle, then it can be seen that the color change effect due to the cholesteric liquid crystal layer is produced. On the side of the cholesteric liquid crystal layer (A) of the medium for judging authenticity, a right-handed circular polarizing plate is superimposed, and the overall visible coloring is green; Visible coloring is red, authenticity can be judged. the

[Example 8]

Using a polymerizable nematic liquid crystal solution, gravure coating was performed on the surface of a PET film with a thickness of 38 μm, dried, and then irradiated with ultraviolet rays to form a nematic liquid crystal layer with a thickness of 1.0 μm. The polymerizable nematic liquid crystal solution used here is a 15% solution (the solvent is toluene and cyclohexanone) mixed with a polymerizable nematic liquid crystal (manufactured by BASF Co., Ltd., trade name: "Pariocara-LC242") and an ultraviolet polymerization initiator. , wherein the ultraviolet polymerization initiator was mixed in 5% with respect to the polymerizable nematic liquid crystal. Except having used the laminated body of the nematic liquid crystal layer/PET film formed in this way instead of the PET film in Example 7, it carried out similarly to Example 7, and obtained the medium for authenticity determination. the

When the obtained medium for judging authenticity is observed from the cholesteric liquid crystal layer (A) side, the color change effect produced by the cholesteric liquid crystal layer can be seen. On the side of the cholesteric liquid crystal layer (A) of the authentication medium, a right-handed circular polarizer is superimposed, and the whole is colored green, and when the right-handed circular polarizer is removed, and a left-handed circular polarizer is superimposed, the whole is colored It is red, and the authenticity judgment can be carried out. the

[Example 9]

Apply a PVA solution (PVA resin manufactured by Kuraray Co., Ltd., model: "110", used as a 5% aqueous solution (transparent)) on the surface of a TAC film with a thickness of 75 μm, dry it, and rub it to form an alignment film Then, in the same manner as in Example 8, a nematic liquid crystal layer with a thickness of 1.5 μm is formed on the orientation film, and in the same manner as in Example 7, a cholesteric liquid crystal layer with a thickness of 2.2 μm ( A). the

Same as embodiment 7, at the TAC film exposure side of the composite film with the laminated structure of the above-mentioned gained cholesteric liquid crystal layer (A)/alignment film/TAC film, carry out the formation of three-dimensional hologram successively and thickness is The formation of a 500nm transparent reflective layer is used to obtain a medium for judging authenticity. the

The obtained medium for judging authenticity is observed from the side of the cholesteric liquid crystal layer (A), and the color change effect produced by the cholesteric liquid crystal layer can be seen. Overlapping a right-handed circular polarizing plate on one side of the cholesteric liquid crystal layer (A) of the medium for judging authenticity, it can be seen that the overall coloring is green. Colored in red, authenticity can be judged. the

Next, as shown in FIG. 13( a), another medium 61 for judging authenticity of the present invention has the following lamination structure: an orientation film 63, a light selective reflection The pattern layer 64 is laminated with a hologram forming layer 65 under the drawing of the substrate 62 as a light diffraction structure layer, and a reflective layer (also referred to as a light reflective layer) is laminated under the hologram forming layer 65. layer) 66. The hologram forming layer 65 has fine irregularities of a hologram on the lower side thereof, and the reflective layer 66 is laminated along the fine irregularities. In this example, since the light selective reflection pattern layer 64, the hologram forming layer 65, and the reflective layer 66 are laminated with the substrate 62 interposed therebetween, they are formed separately without affecting each other. the

As shown in Figure 13 (b), the medium 61 for judging authenticity of the present invention may have the following laminated structure: in the drawings of the base material 62, an orientation film 63, a light selective reflection pattern layer 64, A hologram-forming layer 65 and a reflective layer 66 are formed. Again, the lower side of the hologram forming layer 65 has the fine unevenness of the hologram, and the reflective layer 66 is laminated along the fine unevenness. This has the advantage that the layers are laminated on only one side of the substrate and the substrate 62 exposed thereon can be used as a protective layer. the

In the above two examples, the light selective reflection pattern layer 64 is a layer formed of a material with light selective reflectivity that reflects one of left-handed circularly polarized light or right-handed circularly polarized light in incident light, for example, a cholesteric liquid crystal layer , the pattern is formed by the presence or absence of layers or the thickness of layers. The reflective layer 66 is made of, for example, a metal thin film or the like. the

In the examples described with reference to FIG. 13 , the light selective reflection pattern layer 64 may be composed of two types of light selective reflection pattern layers, may be composed of the same material but have different thicknesses, or may be composed of different materials for each layer. One of the light selective reflection pattern layers may be a uniform layer. the

In each of the examples described with reference to FIG. 13 , it was shown that an orientation film 63 different from that of the base material 62 is required, but when a stretched plastic sheet is used as the base material 62, the surface of the base material 62 itself has orientation, so the orientation film 63 can be omitted. Lamination of film 63. the

The base material 62 may be made thinner, but preferably has mechanical strength, solvent resistance, and heat resistance that are resistant to processing at the time of manufacturing the authentication medium 61 . It is selected according to the purpose of use and is not particularly limited, but film-like or sheet-like plastics are preferred. Examples may be: polyethylene terephthalate (PET), polycarbonate, polyvinyl alcohol, polysulfone, polyethylene, polypropylene, polystyrene, polyarylate, triacetyl cellulose (TAC ), diacetyl cellulose, polyethylene/vinyl alcohol and other plastic films. the

The alignment film 63 can be used as long as polyvinyl alcohol resin (PVA), polyimide resin or the like is generally used as an alignment film. The alignment film 63 can be formed by applying a solvent solution of these resins on the surface of the above-mentioned substrate 62 by an appropriate coating method, drying it, and then rubbing it with a cloth, a brush, or the like to form a rubbing alignment. When two or more light selective reflection pattern layers are provided, if necessary, an alignment film provided between the light selective reflection pattern layers is also formed in the same manner. the

The light selective reflection pattern layer 64 contains a cholesteric liquid crystal layer. The cholesteric liquid crystal layer in an aligned state has a property of reflecting only one of left-handed circularly polarized light or right-handed circularly polarized light among incident light. The light selective reflection pattern layer 64 can be formed by using a solvent solution of cholesteric liquid crystal in a pattern shape and drying it, or at this time using a polymerizable cholesteric liquid crystal to prepare an ultraviolet polymerizable composition for use in a pattern shape , after drying, it is irradiated with ultraviolet light to polymerize. the

When the light selective reflection pattern layer 64 is formed into a pattern, it is preferably carried out by various printing methods. In addition, when two or more kinds of light selective reflection pattern layers 64 are provided, in order to form at least one of them into a uniform layer , can be carried out by various coating methods. the

The hologram forming layer 65 is a layer containing a transparent resin material with fine concavities and convexities forming a three-dimensional hologram. the

As the transparent resin material constituting the hologram forming layer 65, various thermoplastic resins, thermosetting resins, or ionizing radiation curable resins can be used. Thermoplastic resins include acrylic resins, acrylamide resins, nitrocellulose resins, or polystyrene resins, etc. Thermosetting resins include unsaturated polyester resins, acrylic polyurethane resins, epoxy-modified acrylic resins, epoxy-modified Sexual unsaturated polyester resin, alkyd resin, or phenolic resin, etc. One or more of these thermoplastic resins and thermosetting resins can be used. One or more of these resins can be crosslinked using various isocyanate resins, or mixed with various curing catalysts, metal bases such as cobalt naphthenate, or zinc naphthenate, or mixed with a curing agent that initiates polymerization by heat or ultraviolet light. Peroxides such as benzoyl peroxide and methyl ethyl ketone peroxide, benzophenone, acetophenone, anthraquinone, naphthoquinone, azobisisobutyronitrile, or diphenylsulfide. Ionizing radiation curable resins include: epoxy acrylate, urethane acrylate, acrylic modified polyester, etc., and a crosslinked structure can be introduced into the above ionizing radiation curable resins, or monofunctional resins can be used in combination to adjust viscosity. Monomer or polyfunctional monomer or oligomer, etc. the

When the above-mentioned resin material is used to form the hologram forming layer 65, it can be directly formed by developing by carrying out hologram interference exposure on the photosensitive resin material, and also can use a pre-made three-dimensional hologram or its replica or their plated mold. etc. are used as a replica mold, and the shape is formed by pressing a layer of the above-mentioned resin material on the mold surface. When using thermosetting resin or ionizing radiation curable resin, the uncured resin is closely attached to the mold surface, then cured by heating or ionizing radiation, and peeled off after curing. It can be contained in the cured transparent resin material One side of the layer forms the fine unevenness of the three-dimensional hologram. By forming a pattern shape by the same method, a patterned diffraction grating forming layer having a diffraction grating can also be used as a light diffraction structure layer. the

The reflective layer 66 formed along the fine concavo-convex of the three-dimensional hologram may be either a reflective metal thin film or a transparent layer having a different refractive index from the hologram forming layer 65. When the former is used, an opaque hologram can be obtained. When using the latter, transparent holograms can be obtained. All of the above are reflective holograms that can improve visibility when viewed from the observer side by illumination. the

Materials that make up the reflective metal thin film can be used: Al, Cr, Ti, Fe, Co, Ni, Cu, Ag, Au, Ge, Mg, Sb, Pb, Cd, Bi, Sn, Se, In, Ga or Rb Metals such as metals, oxides or nitrides of these metals, and the like can be used to form a reflective metal thin film by using one or a combination of them. Among them, Al, Cr, Ni, Ag, or Au are particularly preferable, and the film thickness thereof is preferably 1 nm to 10,000 nm, more preferably 2 nm to 200 nm. the

The material constituting the transparent layer having a different refractive index from that of the hologram forming layer 65 includes a transparent material having a different refractive index from the resin material of the hologram forming layer. The optical refractive index of the transparent material may be larger or smaller than that of the resin of the hologram forming layer, and the optical refractive index difference with the hologram forming layer 65 is preferably 0.1 or more, more preferably 0.5 or more, particularly preferably 1.0 or above. Specific materials preferably used include titanium oxide (TiO ₂ ), zinc sulfide (ZnS), Cu·Al composite metal oxide, and the like. A metal thin film having a thickness of 20 nm or less also has transparency, and thus can also be used as a material constituting a transparent layer having a different optical refractive index from that of the hologram forming layer 65 .

Any material may be used, and the reflective layer 65 may be formed by known methods such as sublimation, vacuum deposition, sputtering, reactive sputtering, ion plating, or electroplating. the

A method of authenticity determination will be described by taking the medium 61 for authenticity determination described with reference to FIG. 13( a ) as an example. First, observe the medium 61 for judging the authenticity of the present invention under natural light, as shown schematically in Fig. The hologram 67 recorded in the form of micro-concave-convex, at this time, the light selective reflection pattern layer 64 is transparent, and the medium 61 for judging authenticity is colored in different colors according to different viewing angles, as shown in Figure 14(b), it can be seen that Coloring image 68'. Here, the light selective reflection pattern layer 64 is a layer formed of a material having light selective reflectivity that reflects right-handed circularly polarized light. Therefore, as shown in FIG. 14(c), the character "A" is not displayed, and only the hologram 67 is visible. the

Authenticity determination can be performed in the same manner as above with respect to the authenticity determination medium 61 described with reference to FIG. 13( b ). the

Therefore, the medium 61 for judging authenticity of the present invention, which is described with reference to FIG. 13 , in which the light selective reflection pattern layer 64 and the hologram forming layer 65 are laminated, displays differently depending on the viewing angle or by incident left-handed circularly polarized light. From the perspective of the observer, different images can be seen. By comparing the image of the pre-confirmed genuine product, or injecting left-handed circularly polarized light into the genuine product and the item to be authenticated, by comparing the reflectivity Or the image you see can be used to determine the authenticity. The left-handed circular polarized light is incident on the light selective reflection pattern layer 64 for observation, and the left-handed circular polarizer can be superimposed on the light selective reflection pattern layer 64 for observation. the

As described below with reference to FIG. 15, by processing the authenticity determination medium 61 of the present invention described with reference to FIG. 61 of the various items. the

FIG. 15( a ) is a form of a label, and an adhesive layer 72 is laminated on the side of the reflective layer 66 of the medium 61 for authenticity determination to form a medium label 71 for authenticity determination. The medium 61 for authenticity determination includes the following lamination structure: a substrate 62 , a light selective reflection pattern layer 64 , a hologram forming layer 65 and a reflective layer 66 are sequentially laminated. The authentication medium 61 constituting the authenticity medium label 71 is not limited to the above-mentioned laminated structure, and may be each of the laminated structures described with reference to FIG. 13 or a laminated structure in which the alignment film 63 is omitted. . the

As described above with reference to FIG. 15( a ), when used for authentication, it is more preferable to laminate the adhesive layer 72 on the reflective layer 66 side, and the adhesive layer may be laminated on the substrate 62 side. Which side of the medium 61 for authenticity determination is used to laminate the adhesive layer can be determined according to which side of the reflective layer 66 side or the base material 62 side is the incident surface when applying labels to various items. Sure. When the reflective layer 66 is made of a reflective (i.e., except for transparency) metal thin film, one side of the substrate 62 is the incident surface. When the medium 61 for authenticity determination is constructed using a substrate that must have an orientation film 63 like a triacetyl cellulose film, right-handed circular polarization can be performed from the side of the reflective layer 66 in order to see the above-mentioned latent image. Or the incidence of left-handed circularly polarized light can also be carried out from the substrate 62 side, but the surface of the polyethylene terephthalate resin film or polycarbonate resin film has orientation and does not require an orientation film. When constituting the base material, the incident of right-handed circularly polarized light or left-handed circularly polarized light must be performed from the side of the reflective layer 66 . When the adhesive layer is laminated on the substrate 62 side, a protective layer may be laminated on the reflective layer 66 side. The adhesive layer 72 can be an adhesive layer of various forms, preferably a heat-sensitive adhesive layer or an adhesive layer. the

Figure 15(b) is in the form of a transfer sheet. In the illustrated example, an adhesive layer 72 is laminated on the side of the reflective layer 66 of the medium 61 for authenticity determination, and a releasable film is laminated on the side of the substrate 62. The peelable surface 74a side of the layer 74 constitutes the medium transfer sheet 73 for judging authenticity. The medium 61 for authenticity determination includes the following lamination structure: a substrate 62 , a light selective reflection pattern layer 64 , a hologram forming layer 65 and a reflective layer 66 are sequentially laminated. The authentication medium 61 constituting the authentication medium transfer sheet 73 is not limited to the above-mentioned laminated structure, and may be each laminated structure described with reference to FIG. 13 , or a layer obtained by omitting the alignment film 63 therefrom joint structure. the

The media transfer sheet 73 for judging authenticity is the same as the media label 71 for judging authenticity, and the side on which the adhesive layer is laminated is placed on the side of the media 61 for judging authenticity. When the transfer sheet is applied to various articles, it depends on whether the incident surface is the reflective layer 66 side or the base material 62 side, and the peelable base material 74 can be laminated on the side where the adhesive layer is not laminated. The adhesive layer 72 can be an adhesive layer of various forms, preferably a heat-sensitive adhesive layer or an adhesive layer. The adhesive layer is applied to the surface of various articles using the authentication medium 61, and the transfer sheet may not have an adhesive layer. the

In order to further improve the effect of reflected light of different colors due to the pattern of the light selective reflection pattern layer 64 in the medium 61 for judging authenticity of the present invention due to different viewing angles or/and the hologram forming layer 44 based on the lower layer side or For the visibility of the hologram of the reflective layer 5, it is preferable to laminate a dark layer such as a resin layer colored in a dark color such as black on the lower layer side of each layer. When the adhesive layer 72 is laminated on the lower layer side as described with reference to FIG. 15, a dark layer may be laminated between the reflective layer 66 and the adhesive layer 72, or a dark adhesive colored in a dark color such as black may be used instead of another layer. Combine the dark layer to form the adhesive layer 72. the

The medium 61 for judging authenticity of the present invention is preferably used in the form of the above-mentioned media label 71 for judging authenticity, or in the form of a medium transfer sheet 73 for judging authenticity, and is applied to various items. The form of the media label 71 for judging the authenticity is used by sticking the adhesive layer 72 on one side of the adherend, and the form of the medium transfer sheet 73 for judging the authenticity is by pasting the adhesive layer 72 on the adherend. compound side, and then peel off the peelable substrate 74 for application. the

FIG. 16 is a diagram for explaining the application of the authenticity determination medium 61 mainly for sheet objects. 16( a ) shows an authenticity-determinable information recording body 75 formed by laminating an authenticity-determining medium 61 on a part of the surface of an information recording body 76 . The information recording body 76 is a sheet-like object with a base material such as paper or plastic sheet. In the illustrated example, information such as the amount of money used as securities, the name of the issuing company, and precautions are formed by printing or other methods, or information such as color text 77 and record. the

What Fig. 16 (b) shows is that the medium 61 for judging authenticity is built in the sheet in advance, forms the visible structure; The medium 61 for authenticity determination can be seen through the opening 79. In order to easily apply the medium 61 for determination of authenticity, an example is to cut it into a very narrow vertical line in the figure of about 0.5mm×5mm. When applied to paper, when laminating multiple layers of paper, openings 79 are provided in the layers constituting the surface layer, and linear media 61 for judging authenticity are sandwiched between the layers of the sheet. The linear medium 61 for judging the authenticity can be colored in a dark color on one side of the base material or the like in order to improve the visibility when irradiated with circularly polarized light as needed, and in addition, it can be built into the sheet-like object. In the state, in order to ensure the adhesiveness between the linear medium 61 for authenticity determination and the sheet, an adhesive layer, preferably a heat-sensitive adhesive layer, can be laminated on one or both sides. The medium 61 for judging authenticity is applied to the above-mentioned sheet, and can be used in information records, especially securities or other printed matter with economic value. the

[Example 10]

Gravure printing is performed on the surface of PET film using polymerizable cholesteric liquid crystal ink, then it is dried, and ultraviolet rays are irradiated to form characters and patterns, and a printed film is obtained. The polymerizable cholesteric liquid crystal ink used here is a polymeric nematic liquid crystal (manufactured by BASF Corporation, trade name: "Pariocara-LC242"), a chiral reagent (manufactured by BASF Corporation, trade name: "Pariocarra-LC242"), LC756") and a 40% solution obtained by mixing an ultraviolet polymerization initiator (solvent is toluene), wherein the ratio of the polymerizable nematic liquid crystal/chiral reagent is 95.5/4.5, and the ultraviolet polymerization initiator is mixed with the polymerizable nematic liquid crystal for 5 %. the

Apply the transparent ultraviolet curable resin composition to the surface opposite to the printed surface of the obtained printed film, bring the mold surface of the mold for replicating the three-dimensional hologram into contact with it, irradiate ultraviolet rays, and cure the transparent ultraviolet curable resin composition. , thus forming a three-dimensional hologram. Then, ZnS was vacuum-deposited on the surface on which the three-dimensional hologram was formed to form a transparent reflective layer with a thickness of 400 nm to obtain a medium for judging authenticity. the

Observing the authenticity-judging medium from the side of the reflective layer, holograms, printed characters and patterns can be seen. The printed characters and patterns have different hues depending on the angle at which the authenticity-judgment medium is observed. In addition, , overlapping the left-handed circular polarizing plate, only the hologram can be seen, and the printed text and pictures cannot be seen, so the authenticity can be judged. the

[Example 11]

A medium for judging authenticity was obtained in the same manner as in Example 10 except that characters and patterns, a three-dimensional hologram, and a reflective layer were formed on the same side of the PET film. Observing the medium for authenticity determination from the side of the reflective layer, holograms, printed characters and patterns can be seen. The printed characters and patterns change in hue depending on the angle at which the medium for determination of authenticity is observed. In addition, If left-handed circular polarizers are overlapped, only the hologram can be seen, and the printed text and pictures cannot be seen, so authenticity can be judged. the

[Example 12]

In the same manner as in Example 10, characters and patterns were formed on the surface of the PET film, and then other polymerizable cholesteric liquid crystal inks were used to form characters and patterns different from those formed before on the surface on which the characters and patterns were formed to obtain a formed Two sets of printed films with text and graphics. In the polymeric cholesteric liquid crystal ink used in the latter, the ratio of polymerizable nematic liquid crystal/chiral reagent is 96.2/3.8, and it is the same as that used in Example 10 except that. Then, a three-dimensional hologram and a reflective layer were sequentially formed in the same manner as in Example 10 on the surface opposite to the printed surface of the obtained printed film to obtain a medium for authenticity determination. the

The medium used to determine the authenticity observed from the side of the reflective layer can be seen as a hologram, two sets of characters and patterns, and the hues of the two sets of characters and patterns change differently due to the different angles of observing the medium used to determine the authenticity , overlapping the left-handed circular polarizing plate, only the hologram can be seen, and the printed characters and patterns are all missing, so the authenticity can be judged. the

Claims (7)

1. be used to judge the medium of the true and false; It closes the 1st light from observation side layer successively and selects reflection horizon, phase separation layer, the 2nd light to select reflection horizon, reflection hologram to form; The the above-mentioned the 1st and the 2nd light selects the reflection horizon to reflect one of them light of in the incident light of observing side left circularly polarized light or right-circularly polarized light and select reflexive material to constitute by having; And above-mentioned the 1st light selects reflection horizon and above-mentioned the 2nd light to select the reflected light centre wavelength in reflection horizon different mutually; By the light time of observing side incident left circularly polarized light; Select painted reflected light that reflection horizon or above-mentioned the 2nd light selects the reflection horizon and be observed overlappingly from above-mentioned the 1st light by the light of above-mentioned reflection hologram diffraction; By the light time of observing side incident right-circularly polarized light, different with the light time of incident left circularly polarized light select the reflected light that is colored as different colours that reflection horizon or above-mentioned the 1st light selects the reflection horizon and be observed overlappingly by the light of above-mentioned reflection hologram diffraction from above-mentioned the 2nd light.

2. the medium that is used to judge the true and false of claim 1, it is characterized in that: above-mentioned phase separation layer is a transparent base film.

3. the medium that is used to judge the true and false of claim 1, it is characterized in that: above-mentioned phase separation layer is the lamilated body that contains transparent membrane and nematic liquid crystal layer.

4. be used to judge the media label of the true and false, it is characterized in that: in claim 1-3 each the medium that is used for judging the true and false also layer closed adhesive layer.

5. be used to judge the medium transfer printing sheet of the true and false, it is characterized in that: among the claim 1-3 each be used to judge that the medium of the true and false and the peelable surface layer of fissility base material close.

6. the sheet material of the decidable true and false is characterized in that: the medium that is used to judge the true and false that on the part of sheet material, has among the claim 1-3 each visually.

7. the authenticable information recording of the decidable true and false; It is characterized in that: close among the requirement 1-3 that has the right each the medium that is used to judge the true and false as the superficial layer of the authenticable information recording of identification object, perhaps on the part of above-mentioned authenticable information recording, have among the claim 1-3 each the medium that is used to judge the true and false visually.

Images