JP2011123347A - Forgery-proof medium, forgery-proof label and article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high functional forgery-proof medium in which a plurality of durable forgery-proof techniques are combined without forming a multi-layered structure, because avoiding a multi-layered groove and simplifying a layer structure are necessary and because using a weak-to-light substance such as liquid crystal in a latent image manifestation method gives rise to a problem of light resistance, while a high functional medium is desired in which a plurality of forgery-proof techniques are combined such as an overt technique and a covert technique for the purpose of enhancing forgery-proof effect. <P>SOLUTION: The forgery-proof medium is characterized in that it is equipped with a polarizer composed of a metallic conductor having a high density rugged structure in the shape of parallel lines. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is intended to prevent counterfeiting, copy, and counterfeit goods such as banknotes, claims, gift certificates, checks such as cash vouchers, securities, various certificates such as credit cards, ID cards, and official documents, and important documents. It relates to anti-counterfeiting media required as countermeasures and seal labels, anti-counterfeiting labels and articles using the same, and with anti-counterfeiting measures with high security that makes it possible to judge authenticity with the naked eye. is there.

  Guarantees, maintains or proves the value of securities, various certificates and important documents such as printed materials, stickers affixed to products as a countermeasure against counterfeit products, and seals that prove that products are unopened It is necessary to prevent forgery with high security.

  The anti-counterfeiting technology includes an overt technology that can be recognized as anti-counterfeiting technology by anyone and enables authenticity judgment, and a covert technology that only a specific person knows the existence of anti-counterfeiting technology and makes an authenticity judgment using a specific method. Divided

  Examples of the overt technique include a diffractive structure whose color and pattern change depending on the viewing angle, and a multilayer interference film. As an example of the covert technique, there are fluorescent printing, line latent image, and the like that perform determination using a device or a filter. In order to further enhance the anti-counterfeit effect, they are often combined with each other to produce a product.

  As an example of the covert technology, the optical axis of the phase shifter is changed in a pattern using liquid crystal or the like, and the latent image is visualized only when it passes through the polarizing plate. A forgery prevention technique that is impossible or difficult, and a method for enhancing the forgery prevention effect by combining this with a diffractive structure are proposed (Patent Document 1).

  However, since the liquid crystal only has a function of changing the optical axis of the incident light as a phase shifter, in order to display a latent image, the two polarizing plates are made of a latent liquid crystal using the liquid crystal with the polarization directions orthogonal to each other. It was necessary to sandwich the image display layer or provide a reflective layer on one side. In addition, since a liquid crystal is used, a multilayer structure is required because it is necessary to provide a light protective layer such as an ultraviolet absorbing layer as a measure for improving light resistance.

  Such anti-counterfeit media are often affixed to authentic products as stickers and transfer foils, and in order to use multi-layer media for security purposes, each layer must have high adhesion and have the desired function. However, it is necessary to select materials with high adhesion and search for conditions, and the more layers, the more time is required for development. In addition, the multi-layer structure has the disadvantage that the number of processes during the production of the product increases, and the cost, delivery time, and yield deteriorate.

  The phenomenon of reflecting linearly polarized light parallel to the linear direction of a conductor and transmitting linearly polarized light in an orthogonal direction is widely known when ultrafine conductors are arranged in a straight line at intervals sufficiently shorter than the wavelength of incident light. It can be used as a polarizing plate. Also, with recent advances in microfabrication technology, it has become possible to arrange ultrafine conductors at intervals sufficiently shorter than the visible light wavelength (Patent Document 2).

  However, because it was difficult to arrange conductors with a wavelength sufficiently shorter than the incident light, it was used exclusively in fields such as infrared light with a long wavelength, and it was used for polarization measurement in the far infrared region and coupling devices for long wavelength lasers. It is an application and not applied to a medium for preventing forgery.

JP 2006-43978 A JP-A-2005-195824

  In order to enhance the anti-counterfeiting effect, it is desirable that the medium be a high-performance medium that combines multiple anti-counterfeiting technologies such as overt technology and covert technology, but it is also necessary to avoid the multi-layer configuration and simplify the layer configuration. There is also a problem of light resistance when a light-sensitive material such as liquid crystal is used in the latent image development method. Therefore, a high-performance anti-counterfeit medium that does not have a multi-layer structure by combining a plurality of anti-counterfeit technologies is required.

  Combining a covert technology that can be displayed visually through a polarizing plate and a latent image that is not visible or difficult to view through a polarizing plate, and a diffractive structure as an overt technology. Provide in the same plane, not as a layer. As a result, the above-described problems can be solved without using a multilayer structure. Furthermore, there is no problem of light resistance by not using a light-sensitive material such as liquid crystal in the latent image development method, and the back surface can be visually recognized by providing light transmission to the latent image development part, which improves the design and is visually attractive. An anti-counterfeit medium can be provided. In one embodiment of the present invention, linear polarizers having different polarization directions are arranged on the same plane and viewed through a polarizing plate so that a latent image appears and the visible latent image developing portion has light transmittance. Thus, it is possible to provide a forgery-preventing medium that is visually recognizable by improving the design and making the back surface visible.

  When two types of polarizers that transmit linearly polarized light that are orthogonal to each other are formed on the same plane, when viewed through a polarizing plate, they return to each other with respect to the incident linearly polarized light. The behavior of the incoming light is different: one polarizer is transmitted and the other is reflected or shielded, so that each polarizer appears to have a contrast. Since humans cannot recognize differences in natural light, polarization, polarization direction, etc., they can recognize the contrast as a latent image only when they see this through the polarizing plate. However, the difference between the polarizers cannot be recognized. The term “polarizing plate” as used herein refers to a material that transmits only a certain amount of linearly polarized light when natural light is incident thereon, and any type such as an absorption type and a reflection type can be used as long as it can be realized.

  As a means for solving the above-mentioned problems, the invention according to claim 1 is a forgery prevention medium comprising a polarizer made of a metal conductor having a high-density parallel line uneven structure. .

  The invention according to claim 2 is the anti-counterfeit medium according to claim 1, wherein polarizers having different polarization directions are patterned as pixels and arranged on the same plane.

  The invention described in claim 3 is characterized in that a diffractive structure portion that includes a reflective layer and can reflect diffracted light is provided on the same plane as the polarizer. It is an anti-counterfeit medium.

  The invention according to claim 4 is the anti-counterfeit medium according to any one of claims 1 to 3, wherein a reflective layer is provided on a part of the back side of the polarizer.

  The invention according to claim 5 is the anti-counterfeit medium according to any one of claims 1 to 4, wherein a printed layer is provided on a part of the back side of the polarizer portion. .

  The invention according to claim 6 is the forgery prevention medium according to any one of claims 1 to 5, wherein a light absorption layer is provided on a part of the back side of the polarizer. .

  The invention according to claim 7 is the forgery prevention medium according to any one of claims 1 to 6, wherein a part of the back side of the polarizer part is transparent and a part is opaque. It is.

  The invention according to claim 8 is the forgery prevention medium according to any one of claims 1 to 7, further comprising a protective layer.

  The invention described in claim 9 is an anti-counterfeit label characterized in that an adhesive layer is provided on the back surface of the anti-counterfeit medium described in claims 1-8.

  The invention according to claim 10 is the anti-counterfeit label according to claim 9, further comprising a base material that is releasably supported on the adhesive layer.

  The invention according to claim 11 is an article provided with the forgery prevention medium according to any one of claims 1 to 8 or the forgery prevention label according to claim 9 or 10.

  The anti-counterfeit medium of the present invention can be visually recognized through a polarizing plate, and has a function of displaying a latent image that is not visible or difficult to view without the polarizing plate. Even when combined with a diffractive structure, it is not a multilayer structure but on the same plane, so there is no need to worry about adhesion as in the case of a multilayer structure. Moreover, since it is formed of a metal reflective film having a role of a conductor, there is no deterioration due to light. Since the polarizer is light transmissive, it can have a variety of appearance regardless of the presence or absence of the polarizing plate by changing the state of the back surface. Furthermore, since the polarizer part is manufactured using a fine concavo-convex structure, it is difficult to forge and is effective as a medium for preventing forgery.

The solid diagram explaining the example of embodiment of the high-density parallel-line uneven structure which concerns on this invention. The three-dimensional figure explaining the example of embodiment which formed the metal conductor by vapor deposition in the high-density parallel-line uneven structure concerning this invention. An example of an embodiment in which a polarizer made of a metal conductor having a high-density parallel line-shaped uneven structure according to the present invention and a diffractive structure unit that includes a reflective layer and can reflect diffracted light has been described. Schematic. The cross-section of the example of embodiment with which the diffractive structure part which comprises the polarizer which consists of a metal conductor provided with the high-density parallel-line uneven structure concerning this invention, and a reflection layer, and can reflect a diffracted light was integrated ( Explanatory drawing seen in FIG. 3XZ cross section). The cross-section of the example of embodiment with which the diffractive structure part which comprises the polarizer which consists of a metal conductor provided with the high-density parallel-line uneven structure concerning this invention, and a reflection layer, and can reflect a diffracted light was integrated ( Explanatory drawing seen in FIG. 3YZ cross section). Explanatory drawing which looked at the example of embodiment of the forgery prevention medium which concerns on this invention in the cross section (FIG. 3 YZ cross section). Explanatory drawing which showed an example of the latent image confirmation method of the forgery prevention medium which concerns on this invention. Explanatory drawing which showed an example of the latent image confirmation method of the forgery prevention medium which concerns on this invention. Explanatory drawing which showed a mode that it looked through the polarizing plate of the direction which permeate | transmits linearly polarized light in the x-axis direction of an example of the forgery prevention medium which concerns on this invention. Explanatory drawing which showed a mode that it looked through the polarizing plate of the direction which permeate | transmits linearly polarized light in the y-axis direction of an example of the forgery prevention medium which concerns on this invention. Explanatory drawing which looked at the example of embodiment which gave the back surface process to the forgery prevention medium which concerns on this invention in the cross section (FIG. 3 YZ cross section). Explanatory drawing which showed a mode that the example of embodiment provided with the reflection layer in the forgery prevention medium which concerns on this invention was seen from the back side. Explanatory drawing which showed a mode that the example of embodiment provided with the reflection layer in the forgery prevention medium which concerns on this invention was seen from the front side. Explanatory drawing which showed a mode that the polarizing plate was superimposed on the example of embodiment of the forgery prevention medium which concerns on this invention, and it looked at regular reflection. Explanatory drawing which showed a mode that the example of embodiment which used a part of back side of the forgery prevention medium which concerns on this invention as the light transmissive part was seen. Explanatory drawing which showed a mode that it looked at light from the surface to the example of embodiment which used a part of the back side of the forgery prevention medium which concerns on this invention as the light transmissive part. Explanatory drawing which showed a mode that the polarizing plate was piled up on the example of embodiment which used a part of back side of the forgery prevention medium which concerns on this invention as the light transmissive part, and it was held up to the light from the surface. Explanatory drawing which showed the example of embodiment made into the gift certificate containing the forgery prevention medium which concerns on this invention. Explanatory drawing which showed the example of embodiment of the forgery prevention label which concerns on this invention.

  FIG. 1 and FIG. 2 are for explaining a polarizer formed by a linear concavo-convex structure which is a main element of the present invention. FIG. 1 shows a linear concavo-convex structure formed of a resin having optical transparency. When a conductor is formed by vapor deposition or the like, the conductor is deposited mainly on the convex portion of the concavo-convex structure as shown in FIG. In addition, since the same phenomenon as in the state in which the linear fine conductors are arranged occurs, the polarizer made of the conductor linear concavo-convex structure in which the conductor is formed in the linear concavo-convex structure coincides with the linear direction of the conductor linear concavo-convex structure. Reflects linearly polarized light in the x-axis direction and transmits linearly polarized light in the y-axis direction perpendicular to the linear direction of the conductor linear concavo-convex structure.

  Even when natural light is incident on a polarizer made of a conductor linear concavo-convex structure, it reflects linearly polarized light in the linear direction of the conductor linear concavo-convex structure and transmits linearly polarized light in a direction perpendicular to the linear direction of the conductor linear concavo-convex structure.

  Therefore, among the linear conductor concavo-convex structures in which the linear directions are orthogonal to each other, a set of conductor linear concavo-convex structures that face the same direction is arranged in a certain area, and another type of conductor linear concavo-convex structure in which the straight directions are orthogonal is constant. By arranging the pixels configured by the grouping of areas in the same plane, when viewed through the polarizing plate, a contrast is generated between the pixels, and a latent image can be recognized.

  FIG. 2 is a schematic view of a forgery prevention medium in which two types of conductor concavo-convex structures facing the directions orthogonal to each other are arranged in a pattern so as to be integrated in the same plane among the conductor linear concavo-convex structures as shown in FIG. As shown in FIG.

  The anti-counterfeit medium includes a conductor linear concavo-convex structure X102 in which the linear direction faces the x-axis direction and a conductor straight line in which the linear direction faces the y-axis direction on the structure forming layer 101 that forms the concavo-convex structure or diffraction structure. An uneven structure Y103 and a diffractive structure 104 are formed, and a protective layer 105 is covered thereon.

  FIG. 4 shows a cross section obtained by cutting the anti-counterfeit medium and cutting the structure forming layer 101, the conductor linear concavo-convex structure X102, and the conductor linear concavo-convex structure Y103 at the section XZ107. FIG. 5 shows a cross section cut at a location YZ106.

  An anti-counterfeit medium XZ cross section A20 of FIG. 4 is a cross-sectional view cut at a portion where the conductor linear concavo-convex structure X102 is concave, and an anti-counterfeit medium XZ cross section B21 of the anti-counterfeit medium XZ is concave. It is sectional drawing cut | disconnected by the part which becomes.

  Similarly, the anti-counterfeit medium YZ cross section A30 of FIG. 5 is a cross section cut at a portion where the conductor straight uneven structure Y103 is concave, and the anti-counterfeit medium YZ cross section B31 of the conductor straight uneven structure Y103 is It is sectional drawing cut | disconnected in the part which has become concave.

  3 to 5 do not show the structure of the anti-counterfeit medium in detail, and when the transparent resin and the conductor are clearly written as shown in FIG. 2, the anti-counterfeit medium surface B31 is a cross-sectional detail of the anti-counterfeit medium shown in FIG. 32, and the structure forming layer 101, the transmissive linear uneven structure X601, the transmissive linear uneven structure Y602, the transmissive diffractive structure 603, the conductor 604, and the protective layer 105 are included.

  For example, when a thermoplastic resin or a photocurable resin typified by an acrylic resin, a polycarbonate resin, a styrene resin, or the like is used for the structure forming layer 101, the structure forming layer 101 is transmitted to one main surface by transfer using a mold. The transparent linear concavo-convex structure X601, the transparent linear concavo-convex structure Y602, and the transmissive diffractive structure 603 are easily formed. The structure forming layer 101 may be manufactured by such a method.

  Although it is desirable to use a transparent material such as a transparent resin having transparency, the thermoplastic resin or the photocurable resin is not necessarily limited depending on the application. In the polarizer used in the present invention, since the reflected light is linearly polarized light, it is clear that the structure forming layer 101 may be opaque as long as it is used only for developing a latent image. However, at that time, it becomes difficult to recognize the latent image if a resin of a color that reflects only the same wavelength as the incident light is used. In order to easily recognize a latent image using an opaque resin, it is preferable to use a resin having a color that absorbs incident light.

  The conductor 604 formed on the transmissive linear concavo-convex structure X601 and the transmissive linear concavo-convex structure Y602 mainly accumulates on the convex portions and functions as a polarizer as shown in FIG.

  The conductor 604 formed on the transmissive diffractive structure 603 is formed on the entire surface. Therefore, the transmissive diffractive structure 603 is not necessarily formed of a transparent resin because the entire surface is covered with a conductor to form a reflective layer. However, in order to improve anti-counterfeiting and design properties, a technique for removing a part of the reflective layer of the diffractive structure 104 including the reflective layer is known. When this technique is used, a transparent diffractive structure is used. 603 is preferably formed of a transparent resin having transparency. The technique includes, for example, forming an alkali-resistant layer having light transmittance on the reflective layer in a pattern, etching with an alkaline solution suitable for dissolving the reflective layer over the entire surface, and the alkali-resistant layer. For example, a method of removing only a part of the reflective layer where no film is formed can be used.

  As the conductor 604, since it is desired to have conductivity and light reflectivity, for example, metals such as aluminum, gold, silver, copper, nickel, and zinc having conductivity and metallic luster can be used. . These conductors are formed as thin films by a method such as vapor deposition or sputtering.

  The convex portions of the conductor linear concavo-convex structure X102 and the conductor linear concavo-convex structure Y103 on which conductors are formed must be arranged at intervals sufficiently smaller than the incident light wavelength. For example, when observing with visible light, the interval is 10 nm to 400 nm, which is sufficiently narrower than the visible light wavelength.

Since the conductor is not so formed in the recesses of the conductor linear concavo-convex structure body X102 and the conductor linear concavo-convex structure body Y103, the deeper one is desirable. For example, it is 10 nm to 1000 nm, but is not necessarily limited thereto. At least the conductor deposited on the convex portion and the conductor deposited on the concave portion need to be insulated, and it is better that the aspect ratio with respect to the pitch is high.

  The transmissive diffractive structure 603 is a concavo-convex structure having a pitch of about 100 nm to about 10 μm, and a diffractive structure 104 that reflects diffracted light is provided by providing a light reflection layer. Here, the light reflection layer is also used as the conductor 604. However, the light reflection layer functions as a transparent reflection layer by substituting a high refractive index substance. For example, zinc sulfide and titanium dioxide. When this is used, it is necessary to mask each other when forming the conductor 604 and the transparent reflective layer in the transmissive linear concavo-convex structure body X602, the transmissive linear concavo-convex structure body Y603, and the transmissive structure forming layer X601, respectively. .

  Further, the conductor linear concavo-convex structure X102, the conductor linear concavo-convex structure Y103, the diffractive structure 104, or the transmissive linear concavo-convex structure X601, the transmissive linear concavo-convex structure Y602 provided on the surface of the structure forming layer 101. The surface including the transmissive diffractive structure 603 may include a flat surface that does not have an uneven structure (not shown), and the conductor 604 may or may not be formed on this surface.

  The diffractive structure 104 and the transparent diffractive structure 603 can be omitted.

  The diffractive structure 104 and the transparent diffractive structure 603 may have the conductor 604 formed on the entire surface, or may be formed in part.

  7 and 8 are schematic views showing a method for confirming a latent image of a forgery prevention medium. FIG. 7 shows the case where a polarizing plate is stacked on the anti-counterfeit medium 10 in which the conductor linear uneven structure and the diffraction structure are integrated. FIG. 8 shows a case where a polarizing plate is installed in front of the observer and the anti-counterfeit medium 10 at a distance is viewed. In either case, the latent image can be confirmed.

  When the latent image is confirmed by the method as shown in FIG. 7 or FIG. 8, FIG. 9 is a view seen through a polarizing plate that transmits linearly polarized light in the x-axis direction, and FIG. 10 is a straight line in the y-axis direction. It is a figure explaining a mode that it saw through the polarizing plate of the direction which permeate | transmits polarized light.

  In the case where the reflective ability of the polarizer attached by the conductor linear concavo-convex structure is not sufficient because the conductor film thickness of the conductor linear concavo-convex structure shown in FIG. Even if the incident linearly polarized light is incident, it passes through a part of it, so the back surface of the polarizer made of a conductor linear uneven structure with insufficient reflection capability is formed by the absorbing layer, reflective layer, printing, etc. Contrast can also be achieved by changing the state of the scattering reflection layer with a mark.

  When a polarizer made of a conductor linear concavo-convex structure with insufficient reflectivity reflects a large part of incident light and a polarizing plate is stacked in such a direction as to transmit part of the incident light, When the back side is an absorbing layer, the partially transmitted incident light is absorbed, and the light that enters the eye is only the light reflected by the polarizer surface, so the back side is a reflective layer or a scattering reflective layer. The intensity of light entering the eye is the weakest compared to.

  When the back side of the polarizer in the reflective state is a reflective layer, almost all of the slight incident light that is partially transmitted is reflected and added to the light reflected on the surface of the polarizer. The intensity of light entering the eye is the strongest compared to the case of a layer.

  When the back side of the reflection state polarizer is a colored scattering reflection layer formed by printing or the like, the amount of incident light partially transmitted depends on the wavelength of incident light, When the incident light is close to white, the intensity of light entering the eye is stronger than when the back surface is an absorbing layer and weaker than when the back surface is a reflective layer.

  However, even if an absorption layer, a reflection layer, a scattering reflection layer, etc. are provided on the back side of the reflection state polarizer, it reflects on the surface of the polarizer, particularly when the reflection of strong light such as illumination is seen on the surface of the polarizer. Since the ratio of the slight light intensity change on the back surface due to a part of transmitted light with respect to the most light intensity becomes extremely small, the surface of the polarizer looks uniform brightness at regular reflection.

  When the polarizing plate is not overlaid on the polarizer part with the absorption layer, reflection layer, scattering reflection layer, etc. provided on the back side, and when the polarizing plate is overlaid so that light is transmitted through the polarizer part The absorption layer, the reflection layer, and the scattering reflection layer on the back surface are slightly darkened from the state without the polarizer, but can be seen in almost the same state.

  6 shows the same cross section as FIG. 6 of the anti-counterfeit medium 10 in which the absorption layer 701, the irregular reflection layer 702 colored by printing, and the reflection layer 703 are formed on a part of the back surface of the anti-counterfeit medium 10. 11 is a cross-sectional view 33 of the rear surface processing forgery prevention medium 11.

  When the back surface of the anti-counterfeit medium 10 is an absorption layer 701, when the polarizing plate is overlaid, either the conductor linear uneven structure X102 or the conductor linear uneven structure Y103 transmits light, or When the polarizing plate is not stacked, it looks black. When either of the conductor linear concavo-convex structures X102 or the conductor linear concavo-convex structure Y103 reflects the incident light when the polarizing plates are stacked, the same color as the incident light is visible.

  When the back surface of the anti-counterfeit medium 10 is a diffuse reflection layer 702 that is colored by printing (in this example, temporarily red), when the polarizing plate is overlaid, the conductor linear uneven structure X102 or the conductor linear uneven structure When either Y103 transmits light or when the polarizing plate is not stacked, it looks red. When either of the conductor linear concavo-convex structures X102 or the conductor linear concavo-convex structure Y103 reflects light when the polarizing plates are stacked, the same color as the incident light is visible.

  Here, the color attached to the irregular reflection layer 702 need not reflect only the visible light wavelength. For example, the use of special ink that reflects only infrared rays and cannot be recognized by human eyes, or fluorescent ink that is excited by ultraviolet rays and reflects other wavelengths, can further improve the forgery prevention effect.

  When the back surface of the anti-counterfeit medium 10 is the reflective layer 703, when the polarizing plate is overlaid, either the conductor linear concavo-convex structure X102 or the conductor linear concavo-convex structure Y103 transmits light, or When the polarizing plate is not stacked, the same color as the incident light can be seen. When either of the conductor linear concavo-convex structure X102 or the conductor linear concavo-convex structure Y103 reflects light when the polarizing plates are stacked, the incident light is stronger than when the back surface is the absorption layer 701 or the irregular reflection layer 702. The same color looks strong. Therefore, when the reflective layer 703 and the other layers are present in the same conductor linear concavo-convex structure X102 or conductor linear concavo-convex structure Y103, the portion with the reflective layer 703 appears brighter and has a contrast.

  In addition, since light is blocked by the diffractive structure 104 here, the processing on the back side of the diffractive structure 104 cannot be confirmed from the front surface of the anti-counterfeit medium 10. Although an additional layer is provided only on the uneven structure Y103, the same processing may be performed on the entire surface.

In addition, here, the absorption layer 701, the irregular reflection layer 702, and the reflection layer 703 are provided in the same plane parallel to the back surface of the forgery prevention medium 10, but it is not always necessary to form each layer in the same plane. For example, the reflective layer 703 is formed on a part of the back surface of the anti-counterfeit medium 10, and the absorbing layer 701 is formed on a part of the reflective layer 703 using a sumi ink or the like. The anti-counterfeit medium 10 in such a state may be realized by sticking to a colored paper by printing or dyeing.

  FIG. 12 is a view of the anti-counterfeit medium 10 provided with a reflective layer on a part of the back surface as viewed from the back side. When there is a rhombus pattern 704 in which a black absorption layer 701 and a white diffuse reflection layer 702 are formed by printing, and a reflection layer 703 in which a part of the character pattern “P” is horizontally reversed, a conductor linear uneven structure Since the body X102 and the conductor linear concavo-convex structure Y103 transmit light, a view of the anti-counterfeit medium 10 seen from the surface is as shown in FIG. 13, and the character pattern “P” is visible. At this time, the reflective layer 703 on the back surface may be configured to be sandwiched between the rhombus pattern 704 printed on the entire surface and the anti-counterfeit medium 10.

  When a polarizing plate oriented so as to transmit a straight line change in the y-axis direction is superimposed on the surface of the anti-counterfeit medium 10 and the anti-counterfeit medium 10 is viewed at an angle at which strong light such as illumination is reflected and enters the eyes As shown in FIG. Since the conductor linear concavo-convex structure Y103 reflects strong light, the back-side reflective layer 703 and the rhombus pattern 704 are not visible, and the back-side reflective layer 703 and rhombus pattern 704 are passed through the light transmitting conductor linear concavo-convex structure X102. You can see a part of. However, when the anti-counterfeit medium 10 is viewed at an angle such that strong light such as illumination is not directly reflected by the eyes, the reflected light enhancing portion 705 that is a part of the reflective layer is not connected to the other conductor linear concavo-convex structure Y103. Unlike this part, it looks brighter.

  FIG. 15 shows a case where there is nothing in the reflective layer 703 in FIG. 12 and the light transmitting portion 706 transmits light. When such an anti-counterfeit medium 10 is held over light, only a portion of the light transmission portion 706 is visible as shown in FIG. 16, and a polarizing plate oriented so as to transmit a linear change in the y-axis direction is prevented from forgery. When superimposed on the surface of the medium 10, only the portion of the transmissive portion of the latent image appears to be transmitted as shown in FIG. At this time, if the reflective performance of the conductor linear concavo-convex structure X102 and the conductor linear concavo-convex structure Y103 is not sufficient and part of the light is transmitted, the partial transmission portion 707 is visible.

  The anti-counterfeit medium 10 created by the above method includes a protective layer 105. The protective layer 105 may be affixed to the surface of the anti-counterfeit medium 10 with an adhesive, or may be formed as a protective layer 105 by forming a transparent resin.

  FIG. 18 shows an example of an embodiment in which the forgery prevention medium gift certificate 50 is affixed to improve security, and includes a printed material main body 51.

  The printed material main body 51 includes a base material 52, and the base material 52 is made of, for example, paper or polymer, and a printed layer 53 is formed on the base material 52. The anti-counterfeit medium 10 is fixed to, for example, an adhesive layer on the surface of the base 52 on which the printed layer is formed, and the anti-counterfeit medium 10 is adhered to the surface of the base 52 through an adhesive layer or an adhesive layer. It fixes to 52.

  The printed material main body 51 includes the anti-counterfeit medium 10, and in this example, the anti-counterfeit medium 10 includes the diffractive structure 104, and thus it is difficult to forge or imitate the printed material. Even if an apparently similar one can be made, the anti-counterfeit medium 10 can be seen through the polarizing plate 40, and is a latent image made up of the conductor linear concavo-convex structure X and the conductor linear concavo-convex structure Y, such as “OK”. If there are only a limited number of people who know that this phenomenon occurs, this structure is not noticed, and it is difficult to make this uneven structure itself, which makes forgery more difficult.

  In addition, it is possible to easily determine whether the printed body 51 is a genuine product or a counterfeit product by looking through the polarizing plate 40.

In FIG. 18, the gift certificate 50 is illustrated as the printed material main body 51, but the printed material including the forgery prevention medium 10 is not limited to this, and securities, banknotes, important documents, and plastic for the base material 52 are used. Cards such as ID (identification) cards and IC (integrated circuit) cards. Or the package which accommodates the article | item which should be confirmed that it is a genuine article, or its part may be sufficient.

  Further, in the printed material main body 51 of FIG. 18, it is not always necessary to use an adhesive layer in order to support the forgery prevention medium 10 on the base material 52. For example, if the base material 52 is paper, the forgery prevention medium 10 is spread on paper. The paper may be opened at a position corresponding to the forgery prevention medium 10. Or when the base material 52 uses the material which has a light transmittance, the forgery prevention medium 10 may be embedded in the inside, and the display body 10 is fixed to the back surface of a base material, ie, the surface on the opposite side to a display surface. May be.

  For manufacturing these labeled articles, for example, an adhesive label or a transfer foil can be used.

  FIG. 19 is an explanatory view showing an example of an embodiment of the forgery prevention label, and includes a peeling protection layer 61 in addition to the forgery prevention medium 10, the transfer substrate 60 and the adhesive layer 62. The peeling protective layer 61 can be omitted.

  The transfer base material 60 coated with an adhesive supports the forgery prevention medium 10 so as to be peelable on the display surface side, and is made of a resin film, for example. The peeling protection layer 61 is located between the transfer substrate 60 and the forgery prevention medium 10.

  The adhesive layer 62 covering the back surface of the display surface of the forgery prevention medium 10 is made of, for example, a thermoplastic resin.

  Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes a design and the like within a scope not departing from the gist of the present invention.

10: Anti-counterfeit medium in which a conductor linear uneven structure and a diffraction structure are integrated,
20 ... Anti-counterfeit medium XZ section A,
21 ... Anti-counterfeit medium XZ section B,
30: Anti-counterfeit medium YZ cross section A,
31 ... Anti-counterfeit medium YZ section B,
32 ... Forgery prevention medium cross section details,
33 ... Back-processed anti-counterfeit medium cross section 40 ... Polarizing plate,
41 ... light source,
50 ... Gift certificate,
51 ... printed material,
52 ... Base material 60 ... Transfer base material,
61 ... peeling protective layer,
62 ... Adhesive layer 101 ... Structure forming layer,
102: Conductor linear concavo-convex structure X,
103 ... conductor linear uneven structure Y,
104 ... Diffraction structure,
105 ... protective layer,
106 ... cut surface YZ
107 ... cut surface XZ
601... Transmissive linear uneven structure X
602... Transmissive linear uneven structure Y
603 ... Transmissive diffraction structure 604 ... conductor 701 ... absorbing layer,
702 ... diffuse reflection layer,
703: Reflective layer,
704 ... rhombus pattern,
705 ... Reflected light enhancement part,
706: Light transmission part,
707 ... Partial transmission part

Claims (11)

  An anti-counterfeit medium comprising a polarizer made of a metal conductor having a high-density parallel linear uneven structure.   2. The medium for preventing forgery according to claim 1, wherein polarizers having different polarization directions are patterned as pixels and arranged on the same plane.   The anti-counterfeit medium according to claim 1 or 2, further comprising a diffractive structure portion that includes a reflective layer and can reflect diffracted light on the same plane as the polarizer.   The anti-counterfeit medium according to any one of claims 1 to 3, wherein a reflective layer is provided on a part of the back side of the polarizer.   The forgery prevention medium according to any one of claims 1 to 4, wherein a printed layer is provided on a part of the back side of the polarizer portion.   The forgery prevention medium according to any one of claims 1 to 5, wherein a light absorption layer is provided on a part of the back side of the polarizer portion.   The forgery prevention medium according to any one of claims 1 to 6, wherein a part of the back side of the polarizer part is transparent and a part is opaque.   The medium for preventing forgery according to any one of claims 1 to 7, further comprising a protective layer.   An anti-counterfeit label comprising an adhesive layer on the back surface of the security medium according to claim 1.   The anti-counterfeit label according to claim 9, further comprising a base material releasably supported on the adhesive layer.   An article comprising the anti-counterfeit medium according to any one of claims 1 to 8, or the anti-counterfeit label according to claim 9 or 10.