JP2014006272A - Display body and article with display body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medium which cannot be easily forged and gets a forgery preventing effect.SOLUTION: A display body 100 includes a structure forming layer 11 comprising a first region where a textured structure is formed and a second region comprising a flat surface, a light reflecting layer 12 covering at least a part of the structure forming layer, and a fine particle layer 13 covering a part of the light reflecting layer, and these are laminated on one surface of a substrate 10. In the first region, a bottom face in a recess and an upper face of a projection in the textured structure are substantially parallel to the substrate surface; recesses and projections are two-dimensionally arranged; and an arrangement of the fine particle layer 13 formed in the first region is set to a body-centered cubic lattice arrangement, while arrangement of the fine particle layer 13 formed in the second region is set to a face-centered cubic lattice arrangement.

Description

  The present invention relates to a display technology related to a structural color caused by a concavo-convex structure and a display technology related to a structural color caused by an arrangement of fine particles for exhibiting an anti-counterfeit effect, and more particularly to a display and an article with a display.

  Articles such as securities, certificates, branded products, electronic devices and personal authentication media are desired to be difficult to counterfeit. For this reason, such an article may support a display body having an excellent anti-counterfeit effect.

  Various structures are known as display bodies to which a forgery prevention technique has been applied, and a medium for authenticity determination by a combination of a hologram layer, a light reflective layer, and an alignment film is disclosed. However, the authenticity determination medium provided with the hologram is characterized in that diffracted light shining in a rainbow color can be observed. However, it is widely recognized and the generation of counterfeit products tends to increase. Therefore, there is a problem in providing a sufficient anti-counterfeit effect only with the feature that shines in rainbow color by diffracted light (Patent Document 1).

  Techniques have been proposed in which mobile particles are introduced into a periodic structure exhibiting a structural color to change the structural color. However, since a structural color is changed by applying a voltage between the electrodes, it cannot be attached to a product or the like and used as a forgery prevention medium (Patent Document 2).

  In addition, it has been proposed to form a laminated body having a sense of brightness by laminating an optical coherent chip having an average particle diameter of 5 nm to 800 nm on a substrate having irregularities. However, since there is no reflective layer, the brightness is poor and it cannot be used as a medium for preventing counterfeiting, and the difference between the bottom and the top of the substrate is 0.1 mm or more and 50 mm or less, so that colloidal crystals in which fine particles are arranged There is a problem that the structural color is not shown (Patent Document 3).

  If the structure color is only a concavo-convex structure combined with a diffraction grating, the color saturation will be poor and it will look like a pastel color, and the coloration of colloidal crystals in which fine particles are arranged will also vary depending on the arrangement of the structures. The degree changes, which is insufficient as a forgery prevention effect.

JP 2005-091786 A Special table 2008-096919 Special table 2007-289939

  An object of the present invention is to solve the above-described conventional problems, and to provide a medium that cannot be easily counterfeited and has an anti-counterfeit effect.

As means for solving the above-mentioned problem, the invention according to claim 1 is characterized in that a structure is formed of a first region in which a concavo-convex structure is formed on one surface of a base material and a second region having a flat surface. A display body comprising a layer, a light reflection layer covering at least a part of the structure forming layer, and a fine particle layer covering a part of the light reflection layer,
The bottom surface of the concave portion and the top surface of the convex portion of the concave-convex structure in the first region are substantially parallel to the base material surface, and the concave portion and the convex portion are two-dimensionally installed.
The display body is characterized in that the arrangement of the fine particle layer formed in the first region is a body-centered cubic lattice arrangement, and the arrangement of the fine particle layer formed in the second region is a face-centered cubic lattice arrangement.

  The invention according to claim 2 is the display body according to claim 1, wherein the fine particle layer is a layer in which two or more fine particles are laminated.

  The invention according to claim 3 is characterized in that the shape of the fine particles is a sphere, and the average particle size is 100 nm or more and 1000 nm or less. It is.

  In the invention according to claim 4, the height difference from the top surface of the convex portion to the bottom surface of the concave portion of the concavo-convex structure is 100 nm or more and 600 nm or less. It is a display body as described in.

  The invention according to claim 5 is characterized in that the recesses forming the concavo-convex structure are polygonal or circular and have a size that can accommodate 10% or more of the volume of the fine particles. It is a display body of any one of -4.

  In the invention described in claim 6, the space between the fine particles and the fine particles in the fine particle layer is filled with a light-transmitting embedding resin, and there is a difference in refractive index between the fine particles and the embedding resin. It is 0.01 or more and 0.8 or less, It is a display body of any one of Claims 1-5 characterized by the above-mentioned.

  The invention according to claim 7 is the display body according to any one of claims 1 to 6, wherein the fine particles are formed of a hollow structure containing a gas.

  In the invention according to claim 8, the structure forming layer, the light reflecting layer and the fine particle layer of the base material constituting the display body according to any one of claims 1 to 7 are not laminated. An article with a display body, characterized in that an adhesive layer is provided on one surface and is attached to the article.

  The invention according to claim 9 is the display body according to any one of claims 1 to 7, wherein the base material and the structure forming layer are made light transmissive, and in the base material, An article with a display body, characterized in that a light-transmitting adhesive layer is provided on a surface on which the laminate is not disposed, and is attached to an article having light transparency at least in part.

  According to the present invention, by combining the two structural colors of the concavo-convex structure and the fine particle array, a highly saturated structural color, a color due to the concavo-convex structure, and two colors of the color based on the fine particle array are mixed. Therefore, forgery cannot be easily counterfeited, and it is difficult to reproduce the structural color with a printing technique using current ink, and an anti-counterfeit effect can be obtained.

FIG. 10 is a cross-sectional view illustrating an example of a display body according to one embodiment of the present invention. It is sectional drawing which shows the other example of the display body which concerns on 1 aspect of this invention. It is sectional drawing which shows the other example of the display body which concerns on 1 aspect of this invention. It is a perspective view which shows an example of an uneven structure. It is a perspective view which shows the other example of an uneven structure. It is a perspective view which shows the other example of an uneven structure. It is sectional drawing which shows the diffraction of the light in a fine particle layer. It is sectional drawing which shows the other example of the display body which concerns on 1 aspect of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view illustrating an example of a display body according to one embodiment of the present invention. 2 and 3 are cross-sectional views illustrating other examples of the display body according to one embodiment of the present invention. In FIGS. 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 FIG. 1 depicts a case in which a substrate 10, a structure forming layer 11 laminated on the substrate 10, a light reflecting layer 12, and a particle layer 13 composed of a plurality of particles 14 are drawn. ing. Here, the structure forming layer 11, the light reflecting layer 12, and the fine particle layer 13 are collectively formed into a laminate 200.

  The substrate 10 may have a single layer structure or a multilayer structure. Further, a material having optical anisotropy such as cholesteric liquid crystal may be laminated.

  Moreover, the base material 10 has a thickness that can support the laminate 200, and a PET film, a non-axially stretched polypropylene film, a biaxially stretched polystyrene resin film, or the like can be used as a material.

  A first region DM1 and a second region DM2 are formed on one main surface of the structure forming layer 11. In the first region DM1, a fine uneven structure described later is formed, and in the second region DM2, the structure forming layer 11 is formed so as to be a flat surface substantially parallel to the main surface of the base material 10. . As a material of the structure forming layer 11, for example, a thermoplastic resin, a thermosetting resin, a photocurable resin, or the like can be used.

  The structure forming layer 11 may include a plurality of regions in which a structure different from the fine uneven structure formed in the first region DM1 is formed.

  The structure forming layer 11 may have a single layer structure or a multilayer structure. The structure forming layer 11 may be colored by adding a dye to the resin. Further, fine particles made of metal, semiconductor, ceramic, magnetic material, or the like may be added.

Further, as the material of the structure forming layer 11, for example, an inorganic material such as SiO ₂ , TiO ₂ , MgF ₂ or a mixture thereof can be used, and an uneven structure can be formed by etching using a photomask.

  In addition, when using the inorganic material as the structure formation layer 11, it can form by thin film formation techniques, such as vapor deposition and sputtering, for example.

  The light reflecting layer 12 covers at least one of the first region DM1 and the second region DM2 provided in the structure forming layer 11. By providing the light reflecting layer 12, an optical effect described later is likely to occur. In the display body 100 shown in FIG. 1, the light reflecting layer 12 is formed in the first region DM1 and the second region DM2.

  Examples of the material of the light reflecting layer 12 include metal materials such as aluminum, nickel, chromium, iron, copper, silver, and gold. The light reflecting layer 12 may have a single layer structure or a multilayer structure.

Further, it may be a single layer structure or a multilayer structure of an inorganic material such as SiO ₂ , TiO ₂ , MgF _2, a mixture thereof, or a dielectric material.

  The light reflecting layer 12 can be formed by a thin film forming technique such as vapor deposition and sputtering, for example. Furthermore, in order to spatially distribute the light reflecting layer 12, techniques such as mask vapor deposition, chemical etching, and laser processing are used. By spatially distributing the light reflecting layer 12, an image can be expressed using the distribution of the light reflecting layer 12.

  The fine particle layer 13 is formed by the arrangement of the fine particles 14 on the upper surface of the light reflecting layer 12 in the first region DM1 provided in the structure forming layer 11. By arranging the fine particles 14 to form the fine particle layer 13, an optical effect described later can be obtained. Note that the fine particle layer 13 may be included in the second region DM2.

Examples of the material of the fine particles 14 include organic materials such as polystyrene and acrylic, inorganic materials such as SiO ₂ , TiO ₂ , MgF ₂ , and ZnO, metal materials such as gold, silver, copper, and aluminum, and ceramic materials. Further, functional fine particles and core-shell structured fine particles may be used.

  The fine particle layer 13 is premised on two or more layers. As a preparation method, there is a method of dropping a dispersion liquid and drying it as the simplest method. It is possible to arrange the fine particles by utilizing the movement of the solvent when the solvent dries. At this time, it is difficult to see the diffracted light with only one fine particle layer 13, and two or more fine particle layers are required.

  The display body 100 shown in FIG. 2 depicts the case where the fine particle layer 13 is formed on the first interface region DM1 and the second interface region DM2 in the form shown in FIG. By doing so, an optical effect described later can be attached also in the second interface region DM2.

  The display body 100 shown in FIG. 3 depicts a case where the embedding resin 15 is formed so as to cover all the fine particle layer 13 on the light reflection layer 12 in the form shown in FIG. Here, the refractive index difference between the fine particles 14 forming the fine particle layer 13 and the embedding resin 15 is 0.01 or more and 0.8 or less in order to show the optical effect described later more effectively. It is good to choose.

  In the display body 100 shown in FIGS. 1, 2, and 3, as an example, the light reflecting layer 12 is positioned on the front side with respect to the structure forming layer 11, and the fine particle layer 13 is on the front side with respect to the light reflecting layer 12. It is the composition located in the side. The light reflecting layer 12 may be positioned on the rear surface side of the structure forming layer 11, and the fine particle layer 13 may be positioned on the rear surface side of the light reflecting layer 12. Further, the fine particle layer 13 may be included in the structure forming layer 11.

  The display body 100 shown in FIG. 3 is provided so that the fine particles 14 and the light reflection layer 12 are in contact with each other, but may not be in contact.

  Hereinafter, a detailed configuration and optical effect of the display body 100 illustrated in FIGS. 1, 2, and 3 will be described.

  As described above, the structure forming layer 11 includes the first region DM1 and the second region DM2. More specifically, in the first region DM1, the concavo-convex structure is two-dimensionally and periodically formed on the XY plane as shown in FIGS. On the other hand, the second region DM2 has a flat surface.

  In FIG. 4, the concave portions 20 and the convex portions 21 forming the concavo-convex structure have a rectangular shape and are periodically arranged. In FIG. 5, the recesses 20 have a rectangular shape and are arranged in a square pattern. FIG. 6 shows a case where the shape of the recess 20 in FIG. 5 is circular.

  4, 5, and 6, the shape of the concave portion 20 and the convex portion 21 that form the concave-convex structure formed in the first region DM <b> 1 is a square shape, a rectangular shape, or a circular shape, but a polygonal shape Or a complicated shape such as an elliptical shape or a distorted circular shape, or a geometric pattern.

  In this way, by forming the concavo-convex structure in the first region DM1 and making the shapes of the concave portion 20 and the convex portion 21 forming the concavo-convex structure different, the optical effects described later can also be made different.

  In the concavo-convex structure formed in the structure forming layer 11, the height difference between the bottom surface of the concave portion 20 forming the concavo-convex structure and the top surface of the convex portion 21 is preferably 100 nm or more and 600 nm or less, and 150 nm or more and 400 nm or less. More preferably.

  In addition, the size of the concave portion 20 forming the concave-convex structure is preferably matched with the volume of the fine particles 14 forming the fine particle layer 13 so that 10% or more of the volume of the fine particles 14 can be accommodated in the concave portion 20. By doing so, the optical effect described later appears more remarkably.

  When the concavo-convex structure as shown in FIGS. 4, 5, and 6 is adopted, since the concave portions 20 and the convex portions 21 are periodically arranged, an optical effect like a diffraction grating is brought about. In a normal diffraction grating, the concave portions 20 and the convex portions 21 are continuously arranged in a relief shape, so that diffracted light is generated and exhibits a rainbow color. Here, it can be said that it is one of the structural colors because the diffracted light is colored iridescent by the relief structure.

  On the other hand, the optical effect of the diffraction grating by the concavo-convex structure of the present invention is that the concavo-convex structure is two-dimensionally patterned on the XY plane, so that diffracted light is emitted at a wide azimuth angle on the XY plane. Therefore, when the display body 100 is observed from a certain point, diffracted light having a plurality of wavelengths is observed. Note that since diffracted light has a wide azimuth angle, the color does not change by changing the viewpoint position like a normal diffraction grating, and diffracted light in a specific wavelength range is observed with a wide viewing angle. It becomes possible.

  In addition, the intensity of diffracted light at each wavelength varies depending on the height difference between the bottom surface of the recess 20 and the top surface of the protrusion 21. Therefore, the concavo-convex structure employed in the present invention makes it possible to observe diffracted light emitted by a specific and plural wavelengths at a wide viewing angle, and the wavelength range is high or low between the bottom surface of the concave portion 20 and the top surface of the convex portion 21. Selection is possible by changing the difference.

  If the height difference between the bottom surface of the concave portion 20 and the top surface of the convex portion 21 is 100 nm or more and 600 nm or less as described above, diffracted light is emitted in the wavelength range of the visible light region, so that visual observation is easy. Become.

  The fine particle layer 13 is positively provided in the first region DM1 in which the concavo-convex structure is formed as shown in FIGS. 1 and 3 in the structure forming layer 11 described above. Further, it may be provided in the second region DM2 as shown in FIG. The average particle size of the fine particles 14 forming the fine particle layer 13 is preferably 100 nm or more and 1000 nm or less, and more preferably 150 nm or more and 400 nm or less. This makes it easier to understand the optical effect described later.

The fine particle layer 13 has an optical effect to be described later by arranging a plurality of fine particles 14 in a three-dimensional manner. Note that the arrangement pattern of the fine particles 14 depends on the concavo-convex structure shown in FIGS. 2, 4, 5, and 6. Specifically, in the first region DM1 having the concavo-convex structure shown in FIG.
The particle arrangement of the fine particle layer 13 is a face-centered cubic lattice arrangement (: Face-Centered Cubic). On the other hand, when it exists in 2nd area | region DM2 which consists of a flat surface, it will become a body-centered cubic lattice arrangement | sequence (: Body-Centered Cubic). As described above, the difference in the particle arrangement results in a difference in the structural pitch between the fine particles and also in the optical effects described later.

  FIG. 7 is a schematic view of the fine particle layer 13 taken in the Z direction. From FIG. 7, it can be seen that the fine particle layer 13 is constituted by the arrangement of the fine particles 14. When the incident light IL is incident on the structure in which the fine particles 14 are arranged, light diffraction satisfying the following formula 1 is generated by the arrangement structure.

mλ = 2nd sin θ (Formula 1) [m: diffraction order λ: wavelength of diffracted light (in the medium) n: medium refractive index d: structure pitch θ: light source incident angle]
From Equation 1, it can be seen that the specific wavelength is enhanced by diffraction depending on the structure pitch of the fine particles 14.

  The structure in which the fine particles 14 are arranged three-dimensionally like the fine particle layer 13 is known as an opal crystal, and the wavelength of the diffracted light depends on the structure pitch of the fine particles 14 and the average particle diameter φ of the fine particles 14. It is well known to change.

  In the present invention, the arrangement of the fine particles 14 in the fine particle layer 13 is determined by the uneven structure provided in the structure forming layer 11 and the average particle diameter φ of the fine particles 14. As described above, the structure pitch d of Equation 1 is changed by changing the face-centered cubic lattice arrangement to the body-centered cubic lattice arrangement according to the concavo-convex structure.

  Furthermore, by making the installation intervals of the recesses 20 and the protrusions 21 different, the arrangement of the fine particles 14 is also different, and the structure pitch in the fine particle layer 13 is changed accordingly. In addition, the structural pitch also changes due to the change in the average particle diameter φ of the fine particles 14.

  Therefore, it is possible to obtain a fine particle layer 13 that strongly diffracts light of an arbitrary wavelength by selecting an arbitrary uneven structure and an average particle diameter φ of an arbitrary fine particle 14.

  The shape of the recess 20 forming the concavo-convex structure may be a polygonal shape as shown in FIGS. 4 and 5 or a circular shape as shown in FIG. The shape, size, and depth of the concave portion 20 depend on the particle diameter φ of the fine particles 14 forming the fine particle layer 13, and the shape, size, and depth so that 10% or more of the volume of the fine particles 14 can fit in the concave portion 20. It is good to make it.

  The average particle diameter φ of the fine particles 14 is set to 100 nm or more and 1000 nm or less in the present invention. In Equation 1, when the light source incident angle θ is 90 degrees, the wavelength λ of the diffracted light is twice the structure pitch d (when the refractive index of the medium n = 1 and the diffraction order m = 1). Further, when the fine particles 14 have a close-packed structure pattern, the structural pitch d is the same as the average particle diameter φ of the fine particles 14, and therefore when the average particle diameter φ is 150 nm or more and 400 nm or less, light having a wavelength in the visible light region is emitted. Since it is diffracted, visual observation becomes easy. Further, in order to change the observation angle or observe the diffracted light having the diffraction order m = 2, the average particle diameter φ can be selected in the range of 100 nm to 1000 nm.

  The light diffraction effect cannot be obtained unless at least two fine particle layers 13 are laminated. 1, 2, and 3 all illustrate a case where three layers are stacked, but three or more layers may be stacked, and as the number of layers increases, the intensity of diffracted light increases, and diffracted light Observation becomes easier.

  In the fine particle layer 13, the fine particles 14 are arranged with a specific structure pitch and a specific average particle diameter φ to generate diffracted light, and the light that can be observed when the fine particle layer 13 is observed exhibits a chromatic color. The chromatic colors are called structural colors.

  1, 2, and 3, two diffracted lights of the concavo-convex structure formed in the first region DM1 and a diffracted light of the fine particle layer 13 can be observed in the first region DM1. In FIG. 2, diffracted light can be observed not only in the first region DM1 but also in the second region DM2.

  Therefore, by making the wavelength of the light diffracted by the uneven structure and the wavelength of the light diffracted by the fine particle layer 13 the same structural color with high saturation can be observed. Furthermore, by making the wavelength of the diffracted light different, it is possible to observe a structural color in which two structural colors are mixed. In addition, a structural color or achromatic color with low saturation can be observed by making the two structural colors complementary.

  In FIG. 1, since the fine particle layer 13 is disposed on the front side of the light reflecting layer 12, there is a risk that the fine particle layer 13 is easily peeled off by an external impact. In that case, as shown in FIG. 3, it is possible to fix the fine particle layer 13 using the embedding resin 15. The embedding resin 15 needs to have light permeability.

  The light transmission in the present invention means that the display body and the article with the display body of the present invention are observed through a light source such as natural light, sunlight, or a fluorescent lamp, so that light is transmitted through the display body 100 and the laminate 200, It can be visually observed.

  When selecting the embedding resin 15, the difference in refractive index from the fine particles 14 is important. When the refractive index difference is small, the amount of light diffracted by the fine particles 13 in the embedding resin 15 is reduced, and visual observation of the diffracted light becomes difficult. Therefore, it is desirable that the difference in refractive index is at least 0.01.

  In addition, the refractive index of a high refractive index resin that is generally available at present is about 1.7. In addition, when the refractive index of the fine particles 14 is 1.0 (void), the refractive index difference can be about 0.7 at maximum.

  From the above, when using the embedding resin 15, it is necessary to pay attention to the difference in refractive index with respect to the fine particles 14 and to set the difference in refractive index between 0.01 and 0.8.

  When the fine particles 14 are fixed with the embedding resin 15, it is possible to use a gas 16 as the fine particles 14 as shown in FIG. 8. In particular, when the gas 16 is air (refractive index 1.0), the refractive index difference from the embedding resin 15 becomes larger.

  In the base material 10, when an adhesive is provided on the surface where the laminated body 200 is not formed and the display body 100 is provided on the article, the coloration of the first region DM1 and the second region DM2 is different in the article with the display body. Can do. Since these colors change depending on the shape of the concavo-convex structure and the average particle diameter φ of the fine particles 14, an arbitrary pattern can be expressed.

When the base material 10 is provided with light transmittance and a light-transmitting adhesive is provided on the surface on which the laminate 200 is not formed, and the display body 100 is provided at least on a light-transmitting article, In the article with a display body, the coloration on the front surface and the back surface can be made different. In particular, in the first region DM1, the rugged structure and the structural color due to the fine particle layer 13 can be observed on the front surface, and the structural color due to the concavo-convex structure can be observed on the back surface. By the different coloration on the front and back,
The forgery prevention effect can be enhanced.

  Furthermore, since the structural color due to the concavo-convex structure formed on the structure forming layer 11 has an impression different from that of normal printing ink, it is difficult to forge with the normal printing technique. In addition, forgery is difficult due to the fine uneven structure.

  The display body 100 described above can be used, for example, by being attached to a printed material, a card medium, or other articles via an adhesive as an anti-counterfeit label. Furthermore, it can be used for purposes other than prevention of counterfeiting. For example, the display body 100 can be used as a toy, a learning material, or an ornament.

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

  A UV curable resin having light transmittance corresponding to the structure forming layer was applied to the PET film with a gravure roll coater to obtain an uneven structure forming film.

  Next, in order to form a concavo-convex structure and a flat surface in the interface region, a metal in which the concave structure forming the periodic concavo-convex structure is arranged so as to form a two-dimensional square lattice with a structure depth of 150 nm and a side of 200 nm. A plate was made.

  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 a vacuum deposition method so as to have a film thickness of about 50 nm, and a light reflection layer was provided.

Fine particles were arranged by dropping a dispersion solution of SiO ₂ fine particles having a particle size of 250 nm onto the interface region where the concavo-convex structure was formed and the light reflecting layer was deposited, and drying the solvent. After drying, the fine particles form a body-centered cubic lattice arrangement and the structural color is visible. Thereafter, in order to fix the fine particles, the ultraviolet curable resin used for forming the uneven structure was filled and cured to obtain a display. Moreover, the display body with a display body was obtained by sticking the obtained display body to a base material.

  Further, another obtained display body was stuck on a light-transmitting base material via a light-transmitting adhesive to obtain an article with a display body.

  As described above, an article with a display body obtained using a light-transmitting structure-forming layer, adhesive layer, and substrate can be observed from the surface so that a structural color due to a concavo-convex structure and a structural color composed of a fine particle layer As a result, it was possible to confirm a structural color with high saturation. Moreover, the structural color by a concavo-convex structure was able to be confirmed by observing the articles | goods with a display body from the back surface. That is, it was confirmed that the structural colors observed on the front surface and the back surface of the display-equipped article were different.

<Comparative Example 1>
For comparison, a display body having only a concavo-convex structure and an article with a display body without arranging fine particles were also produced by the above process and materials.

  As a result, it was confirmed that the display body in which the fine particles were arranged and the article with the display body had a structural color due to the uneven structure on the front surface and the back surface. That is, it was confirmed that the structural colors observed on the front and back surfaces of the display body and the article with the display body were almost the same.

  Comparing the display body having only the concavo-convex structure obtained as described above and the display body in which the fine particles are arranged on the concavo-convex structure, the arrangement of the fine particles depends on the structure of the concavo-convex structure and the arrangement of the fine particles The structural color was mixed, and a structural color with high saturation was obtained. This structural color is difficult to reproduce by current printing technology using ink, and has a high anti-counterfeiting effect. On the other hand, a display body having only a concavo-convex structure also exhibits a structural color, which is difficult to reproduce with a printing technique using current ink, but is a known technique and inferior to the present invention in terms of prevention of forgery.

DESCRIPTION OF SYMBOLS 10 ... Base material 11 ... Structure formation layer 12 ... Light reflection layer 13 ... Fine particle layer 14 ... Fine particle 15 ... Embedded resin 16 ... Gas 20 ... Recess 21 ··· convex portion 30 ··· fine particle array surface 100 ··· display body 200 ··· laminate DM1 ··· first region DM2 ··· second region IL · · · incident light φ · · · average particle diameter θ: Light source incident angle d: Structure pitch

Claims (9)

A first region in which a concavo-convex structure is formed on one surface of the substrate; a structure forming layer comprising a second region comprising a flat surface; a light reflecting layer covering at least a part of the structure forming layer; A display body in which a fine particle layer covering a part of a light reflecting layer is laminated,
The bottom surface of the concave portion and the top surface of the convex portion of the concave-convex structure in the first region are substantially parallel to the base material surface, and the concave portion and the convex portion are two-dimensionally installed.
A display body characterized in that the arrangement of the fine particle layer formed in the first region is a body-centered cubic lattice arrangement, and the arrangement of the fine particle layer formed in the second region is a face-centered cubic lattice arrangement.   The display body according to claim 1, wherein the fine particle layer is a layer in which two or more fine particles are laminated.   3. The display according to claim 1, wherein the fine particles have a spherical shape and an average particle diameter of 100 nm to 1000 nm.   The display body according to any one of claims 1 to 3, wherein a height difference of the concavo-convex structure from a top surface of the convex portion to a bottom surface of the concave portion is 100 nm or more and 600 nm or less.   The display according to any one of claims 1 to 4, wherein the concave portion forming the concavo-convex structure has a polygonal shape or a circular shape, and has a size that can accommodate 10% or more of the volume of the fine particles. body.   The space between the fine particles and the fine particles in the fine particle layer is filled with a light-transmitting embedding resin, and a difference in refractive index between the fine particles and the embedding resin is 0.01 or more and 0.8 or less. The display body according to any one of claims 1 to 5, wherein:   The display body according to any one of claims 1 to 6, wherein the fine particles are formed of a hollow structure containing a gas.   An article that is provided with an adhesive layer on the other side of the base material constituting the display body according to any one of claims 1 to 7, wherein the structure forming layer, the light reflecting layer, and the fine particle layer are not laminated. An article with a display body, which is affixed to   8. The display body according to claim 1, wherein the base material and the structure forming layer are made light transmissive, and light is applied to a surface of the base material on which the laminate is not disposed. An article with a display body, wherein an adhesive layer having transparency is provided and attached to an article having light transparency at least in part.