JP2021157079A - Security label - Google Patents

Abstract

To provide a security label which is attached to a ticket or a card, or a booklet page of a passport or a visa, a bank note, a package, or a plug, and capable of verifying authenticity.SOLUTION: Provided is a security label in which a protective layer and a phase modulation layer are laminated and a phase shift structure is formed in the data record area of the phase modulation layer. The data record area includes a plurality of first element cells and a plurality of second element cells. Therein, each of the first element cells and each of the second element cells are arranged in a nested form with a given ratio. A first reproduction image that is reproduced on a front side of the security label, with a space therebetween, by a phase shift structure of the first element cells, and a second reproduction image that is reproduced on a back side of the security label, with a space therebetween, by a phase shift structure of the second element cells, are reproduced. A digital code is recorded in accordance with the arrangement of the first and second element cells in the data record area.SELECTED DRAWING: Figure 1A

Description

An embodiment of the present invention relates to a security label attached to a ticket, a card, a passport, a visa, a banknote, a package, or the like and capable of verifying authenticity.

Laser interference type holograms and CGH (computer generated holograms) that calculate laser interference with a computer are characterized by being able to stereoscopically view using binocular parallax, and are dynamic by changing the observer's viewing range. In recent years, it has been used in many security labels because it has various effects and can realize functions that cannot be exhibited in general printed matter.

Due to such dynamic effects, this type of hologram is characterized by appearing to pop out from the surface of the medium, which is subject to reproduction with a point light source, such as a general elongated fluorescent lamp or a plurality of holograms. There is a drawback that the reproduced image is blurred when illuminated with the illumination of the above and the illumination with a large light emitting surface.

In addition, the deeper the reproduced image, the more pronounced the blur, so there is a trade-off relationship that adding depth makes it easier to blur in order to give a three-dimensional effect.

Therefore, in general, it is difficult to achieve both a three-dimensional effect with a deep depth and a clear reproduced image.

On the other hand, in order to eliminate such blurring of the reproduced image, a blur-free CGH technique composed of a diffraction grating has been reported (for example, Japanese Patent Application Laid-Open No. 2011-248279 (Patent Document 1) relating to a crystal grating). International Patent Application No. 2017183718A1 regarding photocolor (see Patent Document 2).

Although these technologies change the color and brightness of the pattern for both eyes, the basic pattern itself is the same for both eyes, so there is no blurring of the reproduced image and it is easy to see in any environment. However, it has the drawback of lacking a three-dimensional effect. Also, these gratings are not suitable for mechanical reading.

Japanese Unexamined Patent Publication No. 2011-248279 International Patent Application No. 2017183718A1

The present invention has been made in view of the above circumstances, and is attached to a ticket, a card, a page of a passport or visa booklet, a banknote, a package, a stopper, and a security label capable of verifying the authenticity. The purpose is to provide.

The invention according to claim 1, which has been made to achieve the above object, is a security label in which a protective layer and a phase modulation layer are laminated and a phase shift structure is formed in a data recording area of the phase modulation layer. The region has a plurality of first element cells and a plurality of second element cells, and the first element cell and the second element cell 2 are arranged in a nested manner at a constant ratio. The first reproduction image is reproduced on the front side of the security label by the phase shift structure of the first element cell, and the security label is reproduced by the phase shift structure of the second element cell. A second reproduced image reproduced away from the security label is reproduced on the back side, and a digital code is recorded by arranging the first element cell and the second element cell in the data recording area. It is characterized by.

The invention according to claim 2 is a first reproduction distance Z1 which is a distance from the front side of the security label to the first reproduction image, and the back side of the security label to the second reproduction image. The security label according to claim 1, wherein a relationship of Z1 <Z2 is established with the second reproduction distance Z2, which is a distance.

The invention according to claim 3 is characterized in that the digital code is established as a boundary between the first element cell and the second element cell having the same area and the same shape. Or it is the security label described in 2.

According to the fourth aspect of the present invention, a 3D image reproduced away from a medium by CGH (computer generated hologram) and a 2D image composed of diffraction grids having different pitches and azimuth angles are reproduced adjacent to each other. In the security label, the 3D image and the 2D image show the maximum value of brightness at different viewing angles, and at the viewing angle where the brightness of the 3D image shows the maximum value, the brightness of the 2D image. Is 1/10 or less of the brightness of the 3D image, and at a viewing angle where the brightness of the 2D image shows the maximum value, the brightness of the 3D image is 1/10 or less of the brightness of the 2D image. It is a characteristic security label.

The invention according to claim 5 is the security label according to claim 4, wherein the 2D image is digital data.

The invention according to claim 6 is the security label according to claim 5, wherein the 3D image is digital data.

The invention according to claim 7 is the security label according to claim 6, wherein the digital data of the 3D image and the digital data of the 2D image can be recognized as a pair.

The invention according to claim 8 is the security label according to any one of claims 5 to 7, wherein the digital data is provided with data capable of performing a parity check.

The invention according to claim 9 is the security label according to any one of claims 5 to 8, wherein the digital data is drawn after compression and decompressed at the time of reading.

The invention according to claim 10 is any one of claims 5 to 9, wherein the area ratio of the drawing portion and the non-drawing portion in the single data of the digital data is the same regardless of the data. It is a security label described in one item.

The invention according to claim 11 is the security label according to claim 10, wherein a metal reflective layer is formed on the drawing surface of the drawing portion.

In the invention according to claim 12, the drawing unit includes a first drawing unit and a second drawing unit, and the area ratio between the first drawing unit and the second drawing unit is in the data. The security label according to claim 10 or 11, characterized in that they are equal regardless.

The security label according to claim 12, wherein any one of the first drawing unit and the second drawing unit is the non-drawing unit. Is.

According to the present invention, it is possible to provide a security label attached to a ticket or card, or a page of a passport or visa booklet, a banknote, a package, or a stopper, and which can be verified for authenticity.

In particular, according to the invention according to claim 1, by making the depth of the first reproduced image and the depth of the second reproduced image close to each other at the same time, a three-dimensional effect due to the depth can be obtained. In the case of only the first reproduced image, only the stereoscopic effect of the reproduction distance from the surface of the security label to the first reproduced image can be obtained, but the presence of the second reproduced image allows the reproduction of the second reproduced image. It is possible to perceive the reproduction distance from the surface to the reproduction surface of the first reproduction image, and it is possible to obtain a stereoscopic effect regardless of the position of the security label in between. It is also possible to improve forgery resistance and design.

Further, according to the invention according to claim 2, the value of the second reproduction distance Z2 is larger than the value of the first reproduction distance Z1 (Z1 <Z2), so that the first reproduction image is illuminated. It is possible to make it difficult to blur regardless of the distance, the number, and the size of the second reproduced image, and conversely, it is possible to make the second reproduced image observable only by a point light source. Further, by reproducing these two reproduced images, that is, the first reproduced image and the second reproduced image adjacent to each other, the first reproduced image that can be visually recognized even under ambient lighting and the point light source reproduce for the first time. It is possible to reproduce the second reproduced image at the same time.

According to the invention according to claim 3, the digital code can be established as a boundary between a first element cell and a second element cell having the same area and the same shape.

According to the invention according to claim 4, the visible range of the 3D image and the 2D image can be changed, and the effect of changing can be given.

According to the invention according to claim 5, the 2D image reproduced from the medium can be converted into digital data.

According to the invention according to claim 6, the 3D image reproduced from the medium can be converted into digital data.

According to the invention according to claim 7, it is possible to realize an authenticating method in which an authenticizable method can be realized by pairing a digital data composed of a 3D image and a digital data composed of a 2D image.

According to the invention according to claim 8, it is possible to add data capable of parity check to digital data.

According to the invention according to claim 9, it is possible to draw digital data after compression and decompress it at the time of reading.

According to the invention according to claim 10, since the area ratio of the drawing portion and the non-drawing portion in the single data of the digital data can be made equal regardless of the data, even if different data are given. , It is possible to make it a security product that is almost indistinguishable in appearance.

According to the invention according to claim 11, it is possible to provide a metal reflective layer made of, for example, at least one of Al, Ni, and Ag on the drawing surface by coating or vapor deposition.

According to the invention according to claim 12, since the area ratio of the first drawing unit and the second drawing unit in a single piece of digital data can be made equal regardless of the data, different data can be obtained. Even if it is given, it can be made into a security product that is almost indistinguishable in appearance.

According to the invention according to claim 13, it is possible to change either one of the first drawing unit and the second drawing unit to the non-drawing unit.

Is a diagram showing a security label according to the present embodiment and a reproduction image recorded in the storage area of the security label. FIG. 5 is a plan view showing a state in which an observer observes a reproduced image reproduced by the phase shift structure of the security label shown in FIG. 1A from a front direction (upward direction in FIG. 1A). It is a figure which shows two examples which show the positional relationship with the reproduction image of the security label which concerns on this embodiment. It is a figure for demonstrating the visual effect of the security label which concerns on this embodiment. It is a perspective view which shows the arrangement example of the element cell in a recording area. It is a schematic diagram for demonstrating the viewing angle range in a security label. It is a figure which shows the relationship between the viewing area angle and brightness in the security label which concerns on this embodiment. It is a figure for demonstrating the example in which the security label and the reproduction image which concerns on this Embodiment are a digital code. It is sectional drawing of the laminated body with a security label attached. It is a figure for demonstrating that a digital code is formed by a drawing position. It is a figure which shows the data display example of a ternary number. It is a figure which shows the example which the appearance reproduction image is the same, but the recorded data is different.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Components that exhibit similar or similar functions are designated by the same reference numerals throughout the drawings, and duplicate description will be omitted.

FIG. 1A is a diagram showing a security label according to the present embodiment and a reproduction image recorded in a storage area of the security label.

FIG. 1A shows a security label 10 on which a reproduction image reproduced in space is recorded, and reproduction images 1 and 2 recorded as a phase shift structure in the first element cell and the second element cell of the security label 10. Is illustrated.

FIG. 1B is a plan view showing a state in which the observer observes the reproduced image reproduced by the phase shift structure of the security label shown in FIG. 1A from the front direction (upward direction in FIG. 1A). The reproduced images 1 and 2 recorded as a phase shift structure in the recording area can be observed under illumination light. In other words, the reproduced images 1 and 2 recorded as a phase shift structure in the recording area are reproduced by illumination.

The reproduced images 1 and 2 can be composed of a plurality of reproduced points. At this time, the reproduced images 1 and 2 are displayed as a group of reproduction points. The phase shift structure that reproduces the reproduction point calculates the phase in the phase shift structure from the phase shift structure that records the phase of the recording area and the optical distance and wavelength of the reproduction point, and determines the phase of the incident light corresponding to that phase. It can be recorded in the recording area as a phase shift structure to be shifted. The phase shift structure may be recorded in the recording area as a relief structure or as a modulation of the refractive index. The phase difference can be recorded as a relief structure by the following method. First, a resist plate coated with an electron beam resist is exposed to an electron beam having a dose amount corresponding to the phase shift amount, the resist plate is developed, and an uneven surface corresponding to the phase shift amount is formed. A master plate is prepared by depositing a metal layer on an uneven surface formed on a resist plate. Duplicate nickel shims by electroforming from the master plate. The relief structure can be recorded on the resin by embossing the duplicated shim on a film coated with resin on the carrier. Therefore, the phase shift structure recorded as the relief structure is excellent in mass productivity. The resin that embosses the relief structure can be a thermoplastic resin, a cured resin, or a composite of both. In particular, a composite of a thermoplastic resin and a cured resin can record the reproduction point at a high density because the phase can be recorded as a relief structure with high accuracy, and an adhesive security label on which the relief structure is recorded is attached. Since it is tampered with from the body, it can be destroyed when it is heated and peeled off, so that it can have high tamper resistance.

The security label 10 can be attached to the adherend via an adhesive layer. The security label 10 can be attached to the adherend by hot stamping. By attaching the security label 10 to the adherend, a certified body with a security label can be obtained. The adherend can be a printed notebook, a printed page, or a printed card.

Examples of security-labeled certifiers are tickets, banknotes, cards, booklet pages, and stickers. The card can be an ID card, a license card, or a game card. The ID card can be a national ID card, a foreign residence card, or a tax payment card. The booklet can be a passport. Tickets can be cash vouchers, gift vouchers, and admission tickets. The seal can be a sealing seal attached to the opening or stopper of the package. This package can be a metal package, a plastic package, a film package, or a paper package. The package can be a food package, a medical package, or a game card package.

In the example shown in FIG. 1A, the reproduced image 1 displays a star and the reproduced image 2 displays a reproduced image of the moon. That is, the reproduced image 1 and the reproduced image 2 may be different. Further, the sizes of the reproduced image 1 and the reproduced image 2 may be the same. Specifically, the ratio of the area of the convex hull of the reproduced image 1 and the reproduced image 2 can be 1: 2 or more and 2: 1 or less. Further, the size of the reproduced image 2 may be smaller than the size of the reproduced image 1. At this time, specifically, the ratio of the area of the convex hull of the reproduced image 1 and the reproduced image 2 can be 10: 1 or more and less than 2: 1. With respect to the security label 10, the reproduced image 1 is reproduced in front of the observer K, that is, on the front side of the optical code recorder, and the reproduced image 2 is reproduced on the back side of the observer K, that is, on the back side of the optical code recorder. NS.

As shown in FIG. 1A, due to the phase shift structure, the reproduced images 1 and 2 on the plane are reproduced in space apart from the security label 10. In other words, the phase shift structure reproduces the reproduced images 1 and 2 of the plane in space. The shapes of the reproduced images 1 and 2 may be curved surfaces. At this time, the stereoscopic effect when observed by the observer K increases in proportion to the reproduction distance of the reproduced image, that is, the distance between the center of the reproduced images 1 and 2 and the surface of the security label 10. However, if the reproduction distance is made too large, the image will be blurred under a point light source. Therefore, the reproduction distance is set so that blurring does not occur. As shown in FIG. 1A, the reproduction images 1 and 2 of the security label 10 are reproduced in the space on the front side and the space on the back side of the security label 10, respectively. As a result, it is possible to increase the stereoscopic effect while suppressing the blurring of the reproduced images 1 and 2.

The size of the first element cell and the second element cell can be 5 μm or more and 150 μm. This size can be the length of the short side of the element cell. It may also be the length of the short side of the rectangle circumscribing the element cell.

The first element cell and the second element cell in the recording area can be arranged in a nested manner. As a result, the reproduced images 1 and 2 can be reproduced so as to overlap when observed from the front direction. As a result, the stereoscopic effect is poor only on one side of the reproduced images 1 and 2, but the sense of depth can be doubled by reproducing the reproduced images so as to overlap the front side and the back side. Further, a part of the surface composed of the point cloud of the reproduced image 1 and a part of the surface composed of the point cloud of the reproduced image 2 may be made parallel. As a result, it is possible to display a multi-layered composite image.

FIG. 2 is a diagram showing two examples showing the positional relationship of the security label according to the present embodiment with the reproduced image.

In both FIGS. 2A and 2B, the reproduction distance Z1 from the security label 10 to the reproduction image 1 and the reproduction distance Z2 from the security label 10 to the reproduction image 2 are different. a) shows an example in which the two reproduced images 1 and 2 are reproduced on different sides of the security label 10 as described with reference to FIG. 1A, and FIG. 2B shows the two reproduced images 1 and 1. 2 shows an example in which the security label 10 is reproduced on the same side.

When the two reproduced images 1 and 2 are reproduced on the same side with respect to the security label 10, as shown in FIG. 2 (b), they may all be reproduced on the front side, or they are not shown, but vice versa. All may be reproduced on the back side.

FIG. 3 is a diagram for explaining the visual effect of the security label according to the present embodiment, and both FIGS. 3 (a) and 3 (b) are reproductions that are distances from the security label 10 to the reproduction image 1. The reproduction distance Z2, which is the distance from the security label 10 to the reproduction image 2, is longer than the distance Z1.

FIG. 3A shows an example of the visual effect of the reproduced image under ambient lighting, and FIG. 3B shows an example of the visual effect of the reproduced image when the point light source L is used.

As shown in FIG. 3A, under ambient lighting, when the value of the reproduction distance Z2 becomes large, the reproduction image 2 becomes blurred and cannot be visually recognized, while only the reproduction image 1 can be visually recognized.

However, as shown in FIG. 3B, by irradiating the point light source L, a clear reproduced image 2 can be obtained even if the value of the reproduction distance Z2 becomes large, that is, even if the relationship of Z1 <Z2 is established. It is visible. Therefore, a sense of depth can be visually recognized by comparing the reproduced image 1 and the reproduced image 2.

FIG. 4 is a perspective view showing an example of arrangement of element cells in the recording area.

In the security label 10, a recording area S1 for reproducing the reproduced image 1 and a recording area S2 composed of a diffraction grating that diffracts light having a different pitch and azimuth in a specific direction are arranged adjacent to each other in the security label 10. Will be done. The recording area S2 may have a plurality of recording cells. The plurality of recording cells in the recording area S2 may have recording cells in which the pitch, azimuth, or both of the diffraction gratings recorded in the cells are different.

The area of the first element cell S1 can be the same as the area of the second element cell S2 as illustrated in FIG. 4 (a), but the area of the second element cell S1 can be the same as that of the second element cell S2 as illustrated in FIG. 4 (b). It can be larger than the area of the element cell S2 of. That is, S1> S2 can be set.

As illustrated in FIG. 4B, the element cells S1 and S2 of the data recording area may be arranged adjacent to each other with a gap. However, in this case, the brightness of the reproduced image becomes darker depending on the area of the recording area. Therefore, the brightness can be adjusted by changing the area of the first and second element cells.

As shown in FIG. 4B, an appropriate space is placed between the first element cell S1 and the second element cell S2, and the distance is such that the observer can visually recognize the first element cell S1 at the same time. The element cell S1 and the second element cell S2 can be arranged in a nested manner at a constant ratio. The constant ratio can mean that the number of first element cells and the number of second element cells in the unit area of the recording area are constant. Further, the first element cell and the second element cell can have the same size. Further, the first element cell and the second element cell may have the same shape.

FIG. 5A is a schematic diagram for explaining the viewing angle range in the security label.

FIG. 5B is a diagram showing the relationship between the viewing angle of the reproduced image and the brightness.

In FIG. 5B, the horizontal axis represents the viewing angle (deg) and the vertical axis represents the luminance (cd / cm ² ) normalized to 1.0.

The viewing area angle can be an angle with respect to the normal direction of the security label 10 as illustrated in FIG. 5A. Therefore, the viewing angle is 0 degrees in the normal direction of the security label 10.

The security label 10 according to the present embodiment can reproduce the reproduced image 1 and the reproduced image 2 at different viewing angles θ, and as illustrated in FIGS. 5A and 5B, the reproduced image 1 has a reproduced image 1. It can be calculated and produced so that the reproduction is performed so that the brightness is highest at the viewing angle θ1 and the reproduced image 2 is reproduced so that the brightness is highest at the viewing angle θ2.

More specifically, at the viewing angle θ1 where the brightness of the reproduced image 1 shows the maximum value, the brightness of the reproduced image 2 is 1/10 or less of the brightness of the reproduced image 1, and the brightness of the reproduced image 2 has the maximum value. At the viewing angle θ2 shown, the brightness of the reproduced image 1 is 1/10 or less of the brightness of the reproduced image 2.

FIG. 6 is a diagram for explaining an example in which the security label and the reproduced image according to the present embodiment are digital codes.

As shown in FIG. 6, the digital code can be recorded in the recording area by arranging the first element cell S1 and the second element cell S2.

FIG. 6 is an example in which the digital code “00101001” is recorded in the recording area in the arrangement of the first element cell S1 and the second element cell S2.

As illustrated in FIG. 6, a one-dimensional code or a two-dimensional code can be recorded in the data recording area of the phase modulation layer by arranging the element cells S1 and S2. An example of a one-dimensional code is a barcode. An example of a two-dimensional code is a QR code (registered trademark). Further, the code may be composed of a string of alphabets and numbers.

FIG. 7 is a cross-sectional view of the laminated body 50 to which the security label 10 is attached.

The security label 10 can be formed by stacking the protective layer 11 and the phase modulation layer 12 to form a phase shift structure on the phase modulation layer 12. The security label 10 can be formed on the carrier, and the security label 10 on the carrier can be attached to the adherend by hot stamping to the transparent layer 22 via the adhesive layer 13.

The carrier can be a plastic film. The material of the plastic film can be PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PP (polypropylene). Further, the plastic film may have a coat layer formed by applying a resin.

The phase modulation layer 12 can have multiple layers. The phase modulation layer 12 can have a configuration in which an embossing layer, a reflection layer, and a mask layer are laminated in this order. The mask layer can be omitted. The material of the protective layer 11 can be a thermoplastic polymer. The material of the embossing layer can be a cured polymer. The material of the reflective layer can be inorganic. The protective layer 11 and the embossed layer can be formed by coating. The reflective layer can be formed by deposition. The deposition can be physical deposition or chemical volume. Physical deposition can be vacuum deposition or sputtering. The mask layer can be formed by printing ink. Printing can be offset printing, gravure printing, or screen printing. The ink can be an oil-based ink or a water-based ink. Further, the ink may be UV ink.

The embossing layer can be a single layer or a composite layer. The composite layer can be composed of a relief layer, an intermediate portion, and an anchor layer. The relief layer can be a cured polymer. The anchor layer can be a thermosetting polymer. The intermediate layer can be a mixture.

The material of the protective layer 11 can be a mixture of resin and lubricant. The resin can be a thermoplastic resin. Examples of the resin can be an acrylic resin, a polyester resin, a polyamide resin, or a cellulose resin. Further, as the lubricant, waxes such as polyethylene powder, paraffin wax, silicone, and carnauba wax can be used. These can be formed as the release layer 11 on the base material layer by a known coating method such as a gravure printing method or a microgravure method. The thickness of the release layer 11 can be in the range of 0.5 μm and up to 5 μm.

The material of the single-layer embossed layer can be polyacrylate, polyurethane acrylate, or polyacrylic acrylate. The material of the relief layer can be polyacrylate, polyurethane acrylate, or polyacrylic acrylate. The material of the intermediate portion can be a mixture of polyacrylate and polyurethane acrylate. The material of the anchor layer can be polyurethane acrylate.

Further, the transparent layer 21, the security label 10, the transparent layer 22, and the reflection scattering layer 23 are laminated in this order by heat pressurization and thermocompression bonded to be integrated to form a laminated body. The laminate can be a card, tag, or booklet page. As a result, a certification body with a security label can be formed.

In that case, the transparent layer 21, the transparent layer 22, and the reflection scattering layer 23 can be made of the same material. The material of the transparent layer 21, the transparent layer 22, and the reflection scattering layer 23 can be, for example, polycarbonate, but other than that, for example, a thermoplastic resin such as urethane resin, polycarbonate resin, polystyrene resin, polyvinyl chloride resin, etc. Thermocuring of unsaturated polyester resin, melamine resin, epoxy resin, urethane (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, polyol (meth) acrylate, melamine (meth) acrylate, triazine (meth) acrylate, etc. A sex resin, a mixture thereof, a thermoplastic material having a radically polymerizable unsaturated group, or the like can be used.

The transparent layer 22 is vapor-deposited with, for example, Al, and after heat-bonding to the transparent layer 21, the transparent layer 22, and the reflection scattering layer 23, the metal vapor-deposited layer is partially peeled off from the transparent layer 21 side by a laser. Thereby, the reflective layer forming the surface layer of the phase modulation layer 12 can be formed.

The material of the reflective layer can be a metal, a metal compound, or silicon oxide. The metal compound can be a metal oxide, a metal sulfide, or a metal fluoride. These metal compounds are not easily chemically changed and can retain the reproduced image recorded in the recording area for a long period of time.

The metal sulfide can be zinc sulfide. The metal oxide can be titanium oxide. The metal fluoride can be a fluoride magnesium. The metal can be a simple substance of aluminum, silver, tin, nickel, chromium, gold, or an alloy. In particular, since aluminum forms a passivation layer, it has high durability and can retain a reproduced image recorded in a recording area for a long period of time.

Further, as the reflection scattering layer 23, a functional ink whose color changes according to the illumination angle or the observation angle can be used. As such functional inks, for example, optical variable inks, color shift inks, and pearl inks can be used.

In this way, the digital code C can be formed on the phase modulation layer 12.

Next, recording the digital code by arranging the element cells S1 and S2 will be described.

The security label 10 can record a digital code by arranging the element cells S1 and S2. Digital codes can hold data.

FIG. 8A is a diagram for explaining that the digital code is formed by the drawing position.

FIG. 8B is a diagram showing an example of ternary data display.

As described in FIG. 8A, the digital code can be recorded in the recording area by arranging the element cells.

In the example shown in FIG. 8A, the digital code is recorded in eight element cells out of the recording area which is a unit composed of 25 element cells. Even if the number of element cells as a unit is the same, different digital codes can be used as shown in FIGS. 8A (a), 8A (b), and 8A (c).

Further, by assigning "0" to the drawing pattern as shown in FIG. 8A (a), "1" for the drawing pattern as shown in FIG. 8A (b), and "2" for the drawing pattern as shown in FIG. 8A (c). , As shown in FIG. 8B (a), data can be recorded in ternary numbers. The recording of ternary data as shown in FIG. 8B (a) can be recorded by embedding it in the motif of the data recording area (month) formed as a motif, as illustrated in FIG. 8B (b). By magnifying and observing, the arrangement as shown in FIG. 8B (a) can be read.

Further, even if the number of element cells per unit is the same, different codes can be used. Therefore, the reproduced image to be visually recognized is the same, but the recorded data can be different. In other words, the ratio of the first element cell to the second element cell in the series of data (for example, 8:17) can be constant regardless of the recorded data. The first element cell or the second element cell may be flattened.

By flattening some of the element cells in the recording area, the area ratio of the element cells can be reduced. On the contrary, the area ratio of the drawing portion can be increased by arranging the element cells in a part of the flat recording area. This flat recording area may be replaced with a diffraction grating.

FIG. 9 is a diagram showing an example in which the reproduced image looks the same but the recorded data is different.

The reproduced image 1 seen by the observer K is the same in the case of FIG. 9 (a) and the case of FIG. 9 (b), but the case of FIG. 9 (a) and the case of FIG. 9 (b). Therefore, the display examples of ternary numbers are different, and different data can be represented. Further, a parity bit capable of performing a parity check can be added to such data.

Due to these characteristics, the security label 10 has high counterfeitability and is an aesthetically pleasing label. By attaching the security label 10 to the adherend, the authenticity of the adherend can be reliably verified.

Specific manufacturing of the card according to the embodiment of the present invention will be described in the following examples with reference to FIG. 7.

As the material of the transparent layer 21, SABIC's trade name LEXAN, model number SD8B14, and thickness 100 μm were used. Further, as the material of the transparent layer 22, SABIC's trade name LEXAN, model number SD8B94, and thickness 100 μm were used. Further, as the material of the reflection scattering layer 23, SABIC's trade name LEXAN, model number SD8B24, and thickness of 200 μm were used.

After the security label 10 formed on the carrier is partially hot stamped and attached to the transparent layer 22, the transparent layer 21, the security label 10, the transparent layer 22, and the reflection scattering layer 23 are laminated and formed on a 180-degree plate. It was heat-bonded and then cooled. Then, a card was obtained by punching so as to have a shape of 85 × 54 mm.

The reproduced image is on the front side of the security label 10, a plurality of first element cells that reproduce the star image as a group of a plurality of reproduction points at a distance of 2 mm from the security label 10, and a distance of 8 mm on the back side of the security label 10. A plurality of second element cells for reproducing the image of the moon as a group of a plurality of reproduction points are formed as a phase shift structure in the data recording area of the phase modulation layer 12 of the security label 10 in a nested manner. When the card with the security label 10 attached was observed under a point light source, the one reproduced with the motif of the star and the moon was reproduced at 10 mm with respect to the security label 10, and the depth could be visually recognized. In addition, under ambient lighting with a surface light source or indirect lighting, only the reproduced image of the star reproduced at 2 mm in the foreground could be visually recognized, but the moon is reproduced at 8 mm in the back by irradiation with a point light source. It became possible to visually recognize the image.

[Making electroformed plates]
A master having a relief structure formed as an uneven surface was formed on the resist plate by electron beam drawing, a conductive film was formed by depositing a conductive film on the surface of the master, and then the shim was duplicated by electroforming.

[Making transfer foil]
Further, the security label is formed by applying a peelable protective layer 11 on the carrier of the PET film, and then applying the precursor on the protective layer 11 so that the thickness after drying is 3 μm to form an embossed layer. A shim having an uneven surface formed by electroforming on the surface of the embossed layer was pressed and embossed by heat and UV irradiation, and a relief structure was formed on the embossed layer by the uneven surface. Then, an aluminum reflective layer was formed by vacuum vapor deposition on the surface of the embossed layer on which the relief structure was formed. Further, an adhesive was applied on the reflective layer to form an adhesive layer. The material to be applied may be diluted with a solvent.

As described in the above examples, it was confirmed that the card 50 according to the embodiment of the present invention can be satisfactorily manufactured.

The best mode for carrying out the present invention has been described above with reference to the accompanying drawings, but the present invention is not limited to such a configuration. Within the scope of the claimed technical idea, those skilled in the art can come up with various modifications and modifications, and these modifications and modifications are also the technical scope of the present invention. It is understood that it belongs to.

1 Reproduction image 2 Reproduction image 10 Security label 11 Protective layer 12 Phase modulation layer 13 Adhesive layer 21 Transparent layer 22 Transparent layer 23 Reflective scattering layer 50 Laminated body, card S1 recording area, first element cell S2 recording area, second Element cell

Claims (13)

In a security label in which a protective layer and a phase modulation layer are laminated and a phase shift structure is formed in a data recording area of the phase modulation layer.
The data recording area has a plurality of first element cells and a plurality of second element cells, and the first element cell and the second element cell 2 are nested at a constant ratio. Arranged in a shape,
The first reproduced image reproduced away from the security label on the front side of the security label by the phase shift structure of the first element cell, and the back side of the security label by the phase shift structure of the second element cell. A feature is that a second reproduced image reproduced away from the security label is reproduced, and a digital code is recorded by arranging the first element cell and the second element cell in the data recording area. And the security label. The first reproduction distance Z1 which is the distance from the front side of the security label to the first reproduction image and the second reproduction distance Z2 which is the distance from the back side of the security label to the second reproduction image. The security label according to claim 1, wherein a relationship of Z1 <Z2 is established between the label and the label. The security label according to claim 1 or 2, wherein the digital code is formed as a boundary between the first element cell and the second element cell having the same area and the same shape. A security label in which a 3D image reproduced away from a medium by CGH (computer generated hologram) and a 2D image composed of diffraction gratings having different pitches and azimuth angles are reproduced adjacent to each other.
The 3D image and the 2D image show maximum luminance values at different viewing angles.
At the viewing angle where the brightness of the 3D image shows the maximum value, the brightness of the 2D image is 1/10 or less of the brightness of the 3D image.
A security label, characterized in that, at a viewing angle at which the brightness of the 2D image shows a maximum value, the brightness of the 3D image is 1/10 or less of the brightness of the 2D image. The security label according to claim 4, wherein the 2D image is digital data. The security label according to claim 5, wherein the 3D image is digital data. The security label according to claim 6, wherein the digital data of the 3D image and the digital data of the 2D image can be recognized as a pair. The security label according to any one of claims 5 to 7, wherein data that can be checked for parity is added to the digital data. The security label according to any one of claims 5 to 8, wherein the digital data is drawn after compression and decompressed at the time of reading. The security label according to any one of claims 5 to 9, wherein the area ratio of the drawing portion and the non-drawing portion in the single data of the digital data is the same regardless of the data. The security label according to claim 10, wherein a metal reflective layer is formed on the drawing surface of the drawing portion. The drawing unit includes a first drawing unit and a second drawing unit, and the area ratio between the first drawing unit and the second drawing unit is the same regardless of data. The security label according to claim 10 or 11. The security label according to claim 12, wherein either one of the first drawing unit and the second drawing unit is the non-drawing unit.

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