JP6102051B2 - Authenticity judgment method - Google Patents

Description

  The present invention relates to a display body, a labeled article including the display body, and a method for determining authenticity thereof.

  It is desired that counterfeiting is difficult for articles such as securities, certificates, branded products, electronic devices, and personal authentication media. For this reason, such an article may support a display body having an excellent anti-counterfeit effect.

  Conventionally, various structures are known as display bodies to which anti-counterfeit technology is applied (Patent Documents 1 to 7). For example, in Patent Document 1, in order to increase the security level of a fluorescent image formation using a fluorescent light emitting ink, a fluorescent image formation containing two types of phosphors having different wavelength regions of fluorescence emitted from the respective phosphors Is used. Patent Document 3 discloses an intaglio latent image that can be confirmed only from a specific angle. Patent Document 4 discloses a medium for authenticity determination using a combination of a hologram layer, a light reflective layer, and an alignment film. Furthermore, although application to anti-counterfeiting technology is not intended, in recent years, research on optical effects using structural birefringence has also been made (see, for example, Non-Patent Documents 1 and 2).

  However, since all of the above proposals are based on one forgery prevention function, there is a problem in providing a higher level of security.

Japanese Patent Laid-Open No. 10-250214 JP 2004-181791 A JP 11-291609 A JP 2005-091786 A Japanese translation of PCT publication No. 2002-530687 JP 2009-535670 A JP-A-5-273500

Makoto Okada, Optics (published by the Japan Society of Applied Physics), Vol. 35, No. 5, 280-281 (2006) Makiko Imatsuki et al., Konica Minolta Technology Report, No. 3, pp. 62-67 (2006)

  An object of the present invention is to provide a display body having a more advanced anti-counterfeit effect by providing a plurality of anti-counterfeit functions, a labeled article including the display body, and a method for determining authenticity thereof. .

The invention according to claim 1 of the present invention is a display body configured by laminating a light reflective material layer and a light transmissive material layer, and the light transmissive material layer has an average height of 70 to 140. a plurality of convex linear structures of nm or a plurality of concave linear structures having an average depth of 70 to 140 nm, and an average period of 250 to 400 nm of one-dimensionally arranged first regions, and an average It consists of a shape selected from one or more of a plurality of convex shapes having a height of 70 to 140 nm and a plurality of concave shapes having an average depth of 70 to 140 nm, and the average period is 250 to 400 nm. a display body, characterized in that the second regions arranged in a two-dimensional ing. That is, through the anti-counterfeit effect due to the change in brightness according to the direction of the transmission axis of the linear polarizer in the first region arranged in one dimension, and the diffracted light in the second region arranged in two dimensions Two different anti-counterfeiting effects, which are the anti-counterfeiting effect due to the observed chromatic colors, enable a higher level of authenticity determination.

  The invention according to claim 2 of the present invention is the display body according to claim 1, wherein an average period of the structure of the first region is equal to an average period of the structure of the second region.

  The invention according to claim 3 of the present invention is the display body according to claim 1, wherein an average period of the structure of the first region is different from an average period of the structure of the second region.

  According to a fourth aspect of the present invention, there is provided an arrangement direction of the convex linear structure or the concave linear structure in the first region, and the convex shape body and the concave shape body in the second region. The display body according to any one of claims 1 to 3, wherein one direction of the two-dimensional array of shape bodies selected from one or more of them is parallel to each other.

In the invention according to claim 5 of the present invention, the average height of the plurality of convex linear structures in the first region is higher than the average height of the plurality of convex shaped bodies in the second region, or Since the average depth of the plurality of concave linear structures in the first region is deeper than the average depth of the plurality of concave shapes in the second region, the reflectance of the first region and the second region is the same. It is a display body of any one of Claim 1 to 4 characterized by the above-mentioned.

Further, in the invention according to claim 6 of the present invention, each of the first region and the second region is composed of a plurality of cells, such as a picture, a character, a symbol, etc. each having the plurality of cells as a pixel. The display body according to any one of claims 1 to 4 , wherein an image is displayed.

The invention according to claim 7 of the present invention is a labeled article characterized in that the display body according to any one of claims 1 to 6 is supported by the article via an adhesive layer. is there.

The invention according to claim 8 of the present invention is the display body according to any one of claims 1 to 6 or the labeled article according to claim 7 , wherein the linearly polarizer is used, At least a portion corresponding to the first region is visually confirmed. A method for determining the authenticity of a display body or a labeled article.

  According to the present invention, by providing a plurality of anti-counterfeit functions, it is possible to provide a display body having a higher level of anti-counterfeit effect, a labeled article including the same, and a method for determining authenticity thereof. It becomes.

The top view which shows schematically the display body which concerns on 1 aspect of this invention. Sectional drawing along the II-II line of the display body shown in FIG. Sectional drawing along the III-III line of the display body shown in FIG. The perspective view which shows an example of the relief structure shown in FIG. The perspective view which shows an example of the uneven structure shown in FIG. The perspective view which shows the other example of the uneven structure shown in FIG. The top view which shows an example in the case of observing the display body shown in FIG. 1 through a linear polarizer. The top view which shows the other example in the case of observing the display body shown in FIG. 1 through a linear polarizer. The top view which shows an example in the case of observing the front of the display body shown in FIG. 1 with the reflected light from a display body. The top view which shows the other example in the case of observing the front of the display body shown in FIG. 1 with the reflected light from a display body. The top view which shows the other example in the case of observing the front of the display body shown in FIG. 1 with the reflected light from a display body. The top view which shows the other example in the case of observing the front of the display body shown in FIG. 1 with the reflected light from a display body. The top view which shows an example of an article | item with a label. Sectional drawing along the IV-IV line of the labeled article | item shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same referential mark is attached | subjected to the component which exhibits the same or similar function through all the drawings, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a plan view illustrating an example of a display body according to one embodiment of the present invention. 2 is a cross-sectional view taken along the line II-II of the display shown in FIG. FIG. 3 is a cross-sectional view taken along line III-III of the display shown in FIG. 1, 2, and 3, directions parallel to the main surface of the display body 100 and orthogonal to each other are defined as an X direction and a Y direction, and a direction perpendicular to the main surface of the display body 100 is defined as a Z direction.

  The display body 100 shown in FIGS. 1, 2, and 3 includes a display unit DP1, a display unit DP2, and a display unit DP3. The display body 100 includes a light transmissive material layer 10 and a light reflective material layer 11. 1, 2, and 3, as an example, a case where 10 is located on the front side with respect to the light reflective material layer 11 is illustrated.

  The interface between the light transmissive material layer 10 and the light reflective material layer 11 includes an interface part IP1, an interface part IP2, and an interface part IP3. The interface portions IP1, IP2, and IP3 correspond to the display portions DP1, DP2, and DP3, respectively.

  As a material of the light transmissive material layer 10, for example, a resin having visible light permeability can be used. In particular, when a thermoplastic resin, a thermosetting resin, or a photocurable resin is used, the plurality of convex shaped bodies or concave shaped bodies can be easily formed by transfer using an original plate. Therefore, in this case, if a plurality of convex shaped bodies or concave shaped bodies are formed on the original plate with high accuracy, a precise mass-produced replica can be manufactured relatively easily.

  The light transmitting material layer 10 may have a single layer structure or a multilayer structure. The light transmitting material layer 10 may be colored by adding a dye to the resin.

  The light reflective material layer 11 covers at least a part of the main surface of the light transmissive material layer 10 on which a plurality of convex shaped bodies or concave shaped bodies are provided. By providing this layer, the optical effect caused by the plurality of convex shaped bodies or concave shaped bodies can be made more prominent.

  Examples of the material of the light reflective material layer 11 include metal materials such as aluminum, silver, and gold. Alternatively, a transparent material made of a dielectric having a refractive index different from that of the light transmitting material layer 10 may be used as the material of the light reflecting material layer 11. The light reflective material layer 11 may have a single layer structure or a multilayer structure.

  The light reflective material layer 11 can be formed by a thin film forming technique such as vapor deposition and sputtering, for example. Moreover, a pattern can also be expressed using the distribution of the light-reflective material layer 11 by spatially distributing the region where the light-reflective material layer 11 exists.

  As described above, the interface between the light transmissive material layer 10 and the light reflective material layer 11 includes the interface portions IP1, IP2, and IP3. Hereinafter, these configurations and optical effects will be described.

  In the example shown in FIGS. 1 and 2, the interface portion IP1 is provided adjacent to the interface portion IP2.

  The interface portion IP1 is adjacent to the interface portion IP2 and the interface portion IP3. Interface part IP1 consists of a flat surface. The interface part IP1 may be omitted.

  In the interface portion IP2, a plurality of convex linear structures or concave linear structures are arranged one-dimensionally. The plurality of convex linear structures or concave linear structures constituting the interface portion IP2 shown in FIGS. 1 and 2 are provided so that the lattice vector of the interface portion IP2 is parallel to the X direction.

  The interface part IP2 forms, for example, a diffraction grating pattern. Here, the “diffraction grating” means a structure that generates a diffracted wave when irradiated with illumination light. The “diffraction grating” includes not only a plurality of convex linear structures or concave linear structures exemplified below but also interference fringes recorded on a hologram.

  The interface part IP2 includes, for example, a plurality of grooves arranged one-dimensionally. Each of these grooves may be linear or curved. In the example shown in FIGS. 1 and 2, the interface portion IP2 includes a plurality of convex linear structures or concave linear structures arranged in parallel to each other along the Y axis.

  FIG. 4 shows a perspective view of FIG. The example shown in FIG. 4 includes a plurality of grooves having an average height H2 and an average period D2 that are linearly arranged one-dimensionally in the Y direction.

  A plurality of convex linear structures or concave linear structures provided in the interface portion IP2 exhibit birefringence based on, for example, a polarization separation effect. Hereinafter, the polarization separation effect will be described using the structure shown in FIGS. 1 and 2 as an example.

  In the example shown in FIGS. 1 and 2, the interface portion IP2 includes a plurality of convex linear structures or concave linear structures parallel to each other. Hereinafter, polarized light that vibrates perpendicularly to the convex linear structure or concave linear structure is referred to as TE polarized light, and polarized light that vibrates parallel to the groove is referred to as TM polarized light.

The period of the plurality of convex linear structures or concave linear structures is d, the wavelength of incident light is λ, and the incident angle is θ ₀ . At this time, if the condition of the following formula (1) is satisfied, the interface portion IP2 can be regarded as a thin film having an effective refractive index of n _eff . This effective refractive index n _eff varies depending on the polarization direction of incident light, and is expressed by the following equations (2) and (3) in the first-order approximation, respectively.

dcos θ ₀ <λ (1)
n _TE = {(1-f) n1 ² + f × n2 ² } ^1/2 (2)
n _TM = [n1 ² × n2 ² / {f × n1 ² + (1-f) n2 ² }] ^1/2 (3)
Where
n _TE represents an effective refractive index of TE polarized light, and n _TM represents an effective refractive index of TM polarized light.
n1 is an external field in contact with a layer provided with a plurality of convex linear structures or concave linear structures.
Refractive index.
n2 represents the refractive index of a layer provided with a plurality of convex linear structures or concave linear structures.
f represents the ratio of the width of each convex linear structure or concave linear structure to the period d.

As can be seen from the equations (2) and (3), when f is not 0 or 1, the effective refractive index n _{TE of TE-} polarized light and the effective refractive index n _TM of TM-polarized light are different from each other. This is called “structural birefringence”. Due to this structural birefringence, light incident on the plurality of convex linear structures or concave linear structures produces a phase difference δ represented by the following formula (4).

δ = (n _TE −n _TM ) h (4)
In the formula, h represents the height of the plurality of convex linear structures or the depth of the concave linear structures. As is apparent from the equation (4), it is possible to generate a desired phase difference δ by adjusting the depth h.

  When the interface portion IP2 includes a plurality of convex linear structures or concave linear structures arranged one-dimensionally, the average period D2 is preferably in the range of 200 to 500 nm, More preferably, it is within the range. When such a configuration is employed, even when visible light is used as incident light, the condition of the above formula (1) can be satisfied in a wide angle range.

  When the interface portion IP2 includes a plurality of convex linear structures or concave linear structures arranged one-dimensionally, the average height or average depth H2 is preferably in the range of 50 to 500 nm. , More preferably in the range of 70 to 140 nm. When such a configuration is adopted, the brightness change according to the direction of the transmission axis of the linear polarizer becomes larger when observed through a linear polarizer described later.

  In the interface portion IP3, a shape body selected from one or more of a plurality of convex shape bodies and concave shape bodies is two-dimensionally arranged. The interface part IP3 shown in FIG. 1 and FIG. 3 is selected from one or more of a plurality of convex shaped bodies and concave shaped bodies that are configured, but is two-dimensionally arranged in the X direction and the Y direction, Is provided. In the example shown in FIGS. 1 and 3, the interface part IP3 is assumed to be composed of a plurality of convex shaped bodies.

FIG. 5 shows a perspective view of FIG. FIG. 6 is a perspective view showing another example of the interface part IP3. The example shown in FIG. 5 includes a plurality of convex shaped bodies having a height H3 and an average period D3 arranged in parallel to the X direction and the Y direction. The Y direction that is the arrangement direction of the plurality of convex linear structures of the interface portion IP2 shown in FIG. 4 is parallel to the Y direction that is one of the arrangement directions of the plurality of convex shape bodies of the interface portion IP3. It has become. This facilitates authenticity determination of the display body 100 as will be described later. This also facilitates the design and formation of a plurality of convex shaped bodies or concave shaped bodies constituting each of the interface portions IP2 and IP3.

  In the example shown in FIG. 6, a plurality of convex shaped bodies are arranged at a height H3 and an average period D3 in parallel with a straight line intersecting the X direction and the Y direction at an angle of 45 degrees. In this case, as described later, the authenticity determination method of the display body 100 is different, and the forgery prevention effect is further enhanced.

  In the interface part IP3, the plurality of convex shaped bodies shown in FIGS. 1, 3, 5, and 6 are formed with an average period D3 and an average height H3. The plurality of convex shaped bodies may have a structure including a plurality of convex shaped bodies extending in directions other than the directions shown in FIGS. 1, 3, 5, and 6.

  The plurality of convex shaped bodies in the interface portion IP3 typically have a tapered shape. Examples of the tapered shape include a semi-spindle shape, a cone shape such as a cone and a pyramid, and a truncated cone shape such as a truncated cone and a truncated pyramid. The side surfaces of the plurality of convex shaped bodies may be composed only of inclined surfaces or may be stepped. The tapered shape of the plurality of convex shaped bodies is useful for reducing the reflectance of light incident on the interface portion IP3, as will be described later.

  As described above, since the plurality of convex shaped bodies are regularly arranged, the interface portion IP3 functions as a diffraction grating. Specifically, the plurality of convex shapes shown in FIGS. 5 and 6 function in substantially the same manner as a diffraction grating in which grooves are arranged as indicated by dotted lines.

  Further, as described above, the convex shaped body has a tapered shape. When such a structure is employed, if the average period D3 is sufficiently short, the interface portion IP3 can be regarded as having a refractive index that continuously changes in the Z direction. For this reason, the reflectance with respect to regular reflection light at the interface portion IP3 is small no matter what angle is observed. The interface portion IP3 does not substantially emit diffracted light in the normal direction of the display body 100.

  Therefore, the portion of the display body 100 corresponding to the interface portion IP3 displays, for example, black or dark gray when reflected from the normal direction. Here, “black” means that the wavelength within a range of 400 to 700 nm is obtained when the portion of the display body 100 corresponding to the interface portion IP3 is irradiated with light from the normal direction and the intensity of specular reflection light is measured. Means that the reflectance is 10% or less with respect to all the light components, and “dark gray” irradiates light from the normal direction to the portion corresponding to the interface portion IP3 in the display body 100, so that the regular reflection light When the intensity is measured, it means that the reflectance is about 25% or less for all light components whose wavelength is in the range of 400 to 700 nm which is the wavelength of visible light.

  As described above, the interface portion IP3 displays black or dark gray when observed from the front. Accordingly, the portion of the display body 100 corresponding to the display portion DP3 looks like a black or dark gray print layer when viewed from the front. Since the interface portion IP3 functions in substantially the same manner as the diffraction grating, the interface portion IP3 displays a chromatic color derived from the diffracted light when the observation angle is an angle at which the diffracted light is emitted.

In the interface portion IP3, the average period D3 of a shape selected from one or more of a plurality of convex shapes and concave shapes is 500 nm or less, and is equal to or less than the shortest wavelength of visible light (for example, 400 nm or less). preferable. More preferably, a structure having a function of emitting the first-order diffracted light and appearing black or dark gray can be obtained by setting it to 1/2 or more of the shortest wavelength of visible light, that is, in the range of 200 to 400 nm. When the average period D3 is set to less than 200 nm, a structure that looks black or dark gray is obtained, but the function of emitting diffracted light cannot be obtained. In general, as the average period D3 decreases, the brightness and saturation decrease, and a blacker display becomes possible. As the average period D3 increases, the luminance increases slightly and is perceived as dark gray. It becomes such a structure.

  In addition, the larger the average height or the average depth H3, the more black display becomes possible, and the luminance increases as the average height or the average depth becomes smaller, so that it is perceived as dark gray. Typically, it is desirable that the average height or the average depth H3 is not less than ½ of the average period D3. Specifically, when the average period D3 is 500 nm, dark gray can be displayed by setting the average height or average depth H3 to 250 nm or more, and an average of 500 nm or more which is larger than the average period D3. By setting the height or the average depth H3, a blacker display is possible.

  In addition, the average height or the average depth H2 of the plurality of convex linear structures or concave linear structures in the interface portion IP2 is determined from one or more of the plurality of convex shapes and concave shapes in the interface portion IP3. When the average height or the average depth H3 of the selected shape body is higher or deeper and the average period of the plurality of convex linear structures or concave linear structures in the interface portion IP2 is sufficiently short, the interface portion IP3 Similarly, the interface portion IP2 can be regarded as having a refractive index that continuously changes in the Z direction. For this reason, the reflectance with respect to the regular reflection light at the interface portion IP2 is small no matter what angle is observed. The interface portion IP2 does not substantially emit diffracted light in the normal direction of the display body 100.

  An average height or average depth H2 of a plurality of convex linear structures or concave linear structures in the interface portion IP2, and a shape selected from one or more of a plurality of convex shapes and concave shapes in the interface portion IP3 The difference from the average height or average depth H3 of the body is preferably 50 nm or more. More preferably, the average height or the average depth H3 selected from one or more of the plurality of convex shapes and concave shapes in the interface portion IP3 is more black or dark gray. Looks like.

  With the above-described configuration, the portions corresponding to the display portion DP2 and the display portion DP3 of the display body 100 look like, for example, a black or dark gray print layer when observed from the front. Since the interface portion IP2 and the interface portion IP3 function in substantially the same manner as the diffraction grating, the interface portion IP2 and the interface portion IP3 display a chromatic color derived from the diffracted light when the observation angle is an angle at which the diffracted light is emitted. To do.

  When the configuration as described above is adopted for the interface part IP2 and the interface part IP3, it becomes difficult to distinguish between the interface part IP2 and the interface part IP3. Therefore, forgery of the display body 100 becomes more difficult.

  As described above, the display body 100 includes the interface portion IP2 in which a plurality of convex linear structures or concave linear structures are arranged one-dimensionally, and one of the plurality of convex shaped bodies and concave shaped bodies. A shape body selected from two or more is provided with an interface portion IP3 provided in a two-dimensional array.

  The display part DP2 corresponding to the interface part IP2 exhibits birefringence. Therefore, when the display unit DP2 is observed through a linear polarizer, the brightness changes according to the direction of the transmission axis of the linear polarizer. Further, as is apparent from the above description, when the normal direction of the display unit 100 is observed, it looks black or dark gray. On the other hand, the display part DP3 corresponding to the interface part IP3 exhibits a reflectance of 10% or less. Therefore, the display portion DP3 corresponding to the interface portion IP3 of the display portion 100 looks black or dark gray when observing the normal direction. Therefore, the display body 100 can perform authenticity determination by observation through a linear polarizer.

In addition, both the interface part IP2 and the interface part IP3 have the function of a diffraction grating. Therefore, by observing from the observation direction in which the diffracted light is emitted, the interface portion IP2 and the interface portion IP3 can confirm the chromatic color derived from the diffracted light. The double authenticity determination can be performed by combining the confirmation of the chromatic color by the diffracted light and the confirmation by observation through the linear polarizer described above. Therefore, the display body 100 has a high anti-counterfeit effect.

  The authenticity determination of the display body 100 is performed by observation through a linear polarizer as described above. More specifically, the authenticity determination method of the display body 100 includes observing at least the display unit DP2 through a linear polarizer.

  FIG. 7 is a plan view showing an example when the display body 100 shown in FIG. 1 is observed through the linear polarizer 200. FIG. 8 is a plan view showing another example when the display shown in FIG. 1 is observed through a linear polarizer.

  The linear polarizer 200 shown in FIG. 7 has a transmission axis T parallel to the X axis. The linear polarizer 200 shown in FIG. 8 has a transmission axis T parallel to the Y axis.

  When the arrangement of the display body 100 and the linear polarizer 200 is as shown in FIG. 7, the display unit DP2 looks black or dark gray equivalent to the display unit DP3 when observed through the linear polarizer 200. When the arrangement of the display body 100 and the linear polarizer 200 is as shown in FIG. 8, the display unit DP2 looks relatively brighter than the display unit DP3 when observed through the linear polarizer 200. As described above, when the display unit DP2 of the display body 100 is observed through the linear polarizer 200, the brightness changes according to the direction of the transmission axis of the linear polarizer. Therefore, the authenticity of the display body 100 can be determined by examining the presence or absence of this brightness change.

  As the linear polarizer 200, for example, a linear polarizing film is used. The linear polarizer 200 preferably further includes a diffusion plate. In this case, the diffusion plate is used by being bonded to the front surface, the back surface, or both surfaces of the linear polarizer 200, for example. When the diffusing plate is used, when the display unit DP2 is observed through the linear polarizer 200, it becomes possible to visually recognize the change in brightness according to the change in the observation direction more clearly.

  As described above, the second authenticity determination of the display body 100 is performed by observation from the observation direction in which the diffracted light is emitted. More specifically, the second authenticity determination method of the display body 100 includes observing at least the display unit DP2 through diffracted light.

  FIG. 9 is a plan view showing an example in which light is incident from the light source LS on the display body 100 shown in FIG. 1 and the observer OB observes the reflected light RL from the normal direction of the display body 100. FIG. 10 is a plan view showing another example in which light is incident from the light source LS on the display body 100 shown in FIG. 1 and the observer OB observes the reflected light RL from the normal direction of the display body 100. . The display body 100 of FIG. 10 is installed 90 degrees rotated from the display body 100 of FIG.

  As described above, the display unit DP2 is designed by designing the average height or the average depth of the plurality of convex shapes or concave shapes of the interface portion IP2 and the interface portion IP3 corresponding to the display portion DP2 and the display portion DP3. And in the display part DP3, it becomes black or dark gray when the normal direction is observed. Therefore, in FIGS. 9 and 10, it is difficult to distinguish between the display portion DP2 and the display portion DP3.

  FIG. 11 is a plan view showing an example of the case where the light source LS is incident at an angle at which diffracted light can be observed and the observer OB observes the diffracted light in the display body 100 shown in FIG. FIG. 12 is a plan view showing another example when the light source LS is incident at an angle at which the diffracted light can be observed on the display body 100 shown in FIG. 10 and the observer OB observes the diffracted light. The display body 100 in FIG. 12 is installed 90 degrees rotated from the display body 100 in FIG.

In FIG. 11, since the plurality of convex linear structures or concave linear structures forming the display portion DP2 are arranged one-dimensionally in parallel with the Y direction, diffracted light can be emitted in the observer OB direction. As shown in FIG. 9 or FIG. 10, the display unit DP2 is black or dark gray. On the other hand, a shape selected from one or more of the plurality of convex shapes and concave shapes forming the display portion DP3 is two-dimensionally arranged in the X direction and the Y direction. The light can be emitted in the direction of the observer OB, and the observer OB can confirm the chromatic color due to the diffracted light corresponding to the display unit DP3.

  In FIG. 12, since the plurality of convex linear structures or concave linear structures forming the display portion DP2 are arranged one-dimensionally in parallel with the Y direction, diffracted light is emitted in the observer OB direction. The observer OB can confirm the chromatic color due to the diffracted light in correspondence with the display unit DP2. In the display unit DP3, a shape body selected from one or more of a plurality of convex shape bodies and concave shape bodies forming the display portion DP3 is two-dimensionally arranged in the X direction and the Y direction. Therefore, the diffracted light can be emitted in the direction of the observer OB, and the observer OB can confirm the chromatic color due to the diffracted light corresponding to the display unit DP3. That is, the observer OB can confirm the chromatic color of the diffracted light corresponding to each of the display part DP2 and the display part DP3.

  Thus, the display part DP2 and the display part DP3 of the display body 100 can confirm the chromatic color of the diffracted light according to the observation direction of the display body 100. More specifically, it is examined whether the chromatic color of the diffracted light corresponding to the display unit DP2 changes by rotating the display body by 90 degrees. Therefore, the authenticity of the display body 100 can be determined by checking whether the chromatic color of the diffracted light has changed.

  When examining the presence or absence of a change in the chromatic color of the diffracted light, the display body 100 is rotated by 90 degrees in FIGS. This includes a plurality of convex linear structures or concave linear structures of the interface portion IP2 corresponding to the display portion DP2, and a plurality of convex shapes of the interface portion IP3 corresponding to the display portion DP3. This is because one direction (second direction) in the arrangement direction of the shape body selected from one or more of the shape body and the concave shape body is parallel. Here, when the first direction and the second direction are not parallel, the rotation angle of the display body 100 does not become 90 degrees. More specifically, when the first direction and the second direction form an angle of 45 degrees, the display body 100 is rotated by 45 degrees to check whether there is a change in the chromatic color of the diffracted light. It becomes possible.

  In addition, the average period D2 of the plurality of convex linear structures or concave linear structures forming the display portion DP2, and one or more of the plurality of convex shapes and concave shapes forming the display portion DP3 are selected. When the average period D3 is equal, the chromatic colors of the diffracted light that can be observed by the observer OB are the same in the display portion DP2 and the display portion DP3 in the direction in which the diffracted light can be observed. On the other hand, the average period D2 of the plurality of convex linear structures or concave linear structures forming the display portion DP2, and one or more of the plurality of convex shape bodies and concave shape bodies forming the display portion DP3 are selected. When the average period D3 of the shape bodies is different, the chromatic color of the diffracted light that can be observed by the observer OB is different between the display portion DP2 and the display portion DP3 in the direction in which the diffracted light can be observed.

  The display body 100 described above includes a plurality of convex linear structures or concave linear structures at the interface portion IP2, and includes a plurality of convex or concave shape bodies at the interface portion IP3. . Therefore, by preparing an original plate having a structure corresponding to these and performing duplication using this, precise production can be performed while maintaining the configuration, positional relationship and function of both. Therefore, the reliability of the display body 100 which is a genuine product is increased, and the certainty of the authenticity determination is increased.

In addition, the display unit DP2 and the display unit DP3 are configured by a plurality of cells, and by changing the average period and the average height or the average depth of the plurality of convex shapes and concave shapes included in each cell, It is possible to display an image such as a specific picture, character or symbol. Furthermore, by changing the average period and the average height or average depth of the plurality of convex shapes and concave shapes included in each cell, an image observed through a linear polarizer and diffracted light Variations in the chromatic color changes can be displayed, and more complex images can be displayed.

  Next, a method for using the display body 100 will be described. The display body 100 described above can be affixed to a paper base material as a label via an adhesive, an adhesive, or the like for the purpose of preventing counterfeiting, for example. As described above, the display 100 is difficult to counterfeit or imitate itself. Therefore, when this label is supported on an article, it is difficult to counterfeit or imitate the genuine article with label.

  FIG. 13 is a plan view showing an example of a labeled article, and FIG. 14 is a cross-sectional view taken along line IV-IV in FIG. 13 and 14 show a ticket 300 as an example of an article with a label. The ticket 300 includes a paper base material 30. A printed layer 20 is formed on one surface of the paper substrate 50. The display body 100 described above is fixed to the surface of the paper substrate 30 on which the printing layer 20 is formed, for example, via an adhesive layer 40. The display body 100 is prepared as an adhesive sticker or a transfer foil, for example, and is fixed to the paper substrate 30 by sticking it to the printing layer 20. The ticket 300 includes the display body 100.

  That is, the labeled article obtained by bonding the label having the function of the display body of the present invention to the article can observe the change in brightness according to the direction of the transmission axis of the linear polarizer in the first region, and is fixed. Authenticity can be determined by observation at the position. Further, by tilting the labeled article, it is possible to determine the authenticity of the chromatic color observed through the diffracted light in the second region.

  Examples of the material for the adhesive layer 40 include vinyl chloride-vinyl acetate copolymer, polyester polyamide, and acrylic, butyl rubber, natural rubber, silicon, or polyisobutyl.

  The adhesive layer 30 can be formed by, for example, a printing method such as a gravure printing method, an offset printing method, or a screen printing method, or a coating method such as a bar coating method, a gravure method, or a roll coating method. The adhesive layer 30 may have a single layer structure or a multilayer structure.

  Although FIG. 13 and FIG. 14 illustrate the ticket as an article including the display body 100, the article including the display body 100 is not limited to this. For example, the article including the display body 100 may be cards such as an IC (integrated circuit) card, a wireless card, and an ID (identification) card. Alternatively, the article including the display body 100 may be a plastic banknote or a stamp. Alternatively, the article including the display body 100 may be a tag to be attached to an article to be confirmed as an authentic product. Alternatively, the article including the display body 100 may be a package body that contains an article to be confirmed to be genuine or a part thereof.

  Further, in the ticket 300 shown in FIG. 13 and FIG. 14, the display body 100 is attached to the paper base material 30 via the printing layer 20, but the display body 100 is supported on the base material by another method. be able to. For example, the display body 100 may be embedded inside the base material, or the display body 100 may be fixed to the back surface of the base material, that is, the surface opposite to the display surface.

  Furthermore, the display body 100 may be used for purposes other than forgery prevention. For example, the display body 100 can be used as a toy, a learning material, or a decoration.

  Specific examples of the present invention will be described below, but the present invention is not limited to this embodiment.

  An ultraviolet curable resin was applied to the PET film with a gravure roll coater to form a concavo-convex structure forming film.

  Next, as a matrix used for replication, a first region in which a plurality of convex linear structures having an average period of 400 nm and an average height of 200 nm are arranged one-dimensionally, and a plurality of elements having an average period of 400 nm and an average height of 150 nm A metal plate expressing a pattern was produced by forming a plurality of second regions in which the convex-shaped bodies of the two-dimensionally arranged.

  Next, an ultraviolet curable resin was pressed against the metal plate, irradiated with ultraviolet rays from a metal halide lamp, and after curing the ultraviolet curable resin, the metal plate was peeled off to form an uneven structure. Thereafter, aluminum was deposited on the concavo-convex structure by vacuum deposition to provide a light reflective material layer.

  An adhesive was applied to the light-reflective material layer with a gravure roll coater, then transferred to a paper substrate, and a PET film was peeled off to obtain a display.

  It was confirmed visually that the display body obtained as described above looks dark gray in both the first area and the second area under normal illumination light. In the first region, the appearance and disappearance of the latent image composed of the first region could be visually confirmed by arranging the linearly polarizing film in the immediate vicinity of the display body and rotating the linearly polarizing film.

  Further, the obtained display was tilted to an angle at which the diffracted light could be visually observed, and the diffracted light could be visually confirmed from the second region. In addition, by rotating the display body with the tilt angle fixed, the appearance and disappearance of the chromatic color composed of the diffracted light in the first region could be visually confirmed.

  DESCRIPTION OF SYMBOLS 10 ... Light transmissive material layer, 11 ... Light reflective material layer, 20 ... Printed layer, 30 ... Paper base material, 40 ... Adhesive layer, 100 ... Display body, 200 ... Linear polarizer, 300 ... Labeled goods ticket, T: Transmission axis, DP1: Display unit, DP2: Display unit, DP3 ... Display unit, IP1 ... Interface unit, IP2 ... Interface unit, IP3 ... Interface unit, LS ... Light source, IL ... Incident light, RL ... Reflected light, OB ... an observer.

Claims (7)

A display body configured by laminating a light-reflective material layer and a light-transmissive material layer, wherein the light-transmissive material layer has a plurality of convex linear structures having an average height of 70 to 140 nm, or an average A plurality of concave linear structures having a depth of 70 to 140 nm and a one-dimensionally arranged first region having an average period of 250 to 400 nm; a plurality of convex shapes having an average height of 70 to 140 nm; It consists of a shape selected from one or more of a plurality of concave shapes having a depth of 70 to 140 nm, and is composed of a second region that is two-dimensionally arranged with an average period of 250 to 400 nm, via a linear polarizer Then, at least a portion corresponding to the first region is visually confirmed, and the authenticity determination method for the display body is characterized . The method of claim 1, wherein an average period of the structure of the first region is equal to an average period of the structure of the second region . The method of claim 1, wherein an average period of the structure of the first region is different from an average period of the structure of the second region . A two-dimensional array of shapes selected from one or more of the convex linear structure or the concave linear structure in the first region and the convex shape or concave shape in the second region 4. The method of determining authenticity of a display body according to claim 1, wherein one of the directions is parallel to each other . 5.
Display body of description. The average height of the plurality of convex linear structures in the first region is higher than the average height of the plurality of convex shaped bodies in the second region, or the average of the plurality of concave linear structures in the first region depth, by deeper than the average depth of the plurality of concave-shaped body in the second region, any claims 1 to 4 in which the reflectivity of the second region and the first region is equal to or the same 2. A method for determining the authenticity of a display object according to claim 1 . 2. Each of the first region and the second region is composed of a plurality of cells, and displays an image such as a picture, a character, a symbol, or the like with the plurality of cells as pixels. 5. The authenticity determination method for a display body according to any one of 5 above . The authenticity determination method of the labeled article | item characterized by the display body of any one of Claim 1 to 6 being supported by the article | item through the contact bonding layer .

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