JP2010286579A - Display body, adhesive label, article with label, and authenticity determination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display body, which is sufficiently thin even when the display body is pasted to an object or included into paper, and achieves a higher counterfeit preventing effect by emitting only diffracted light of UV rays. <P>SOLUTION: The display body 10 includes a light-transmitting layer having an interface part included in one main surface, the interface part having a plurality of one-dimensionally or two-dimensionally arrayed recesses or projections which are spaced at a center-to-center distance of 150 nm to 200 nm, and an inorganic thin film layer at least partially covering the interface part; and diffracting UV rays. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display technique that provides, for example, an anti-counterfeit effect.

  It is desirable that authentication items such as cash cards, credit cards and passports, and securities such as gift certificates and stock certificates are difficult to counterfeit. Therefore, conventionally, a label that is difficult to counterfeit or counterfeit and is easy to distinguish from counterfeit or counterfeit is attached to such articles in order to prevent counterfeiting. Such a label is described in Patent Document 1, for example.

    In recent years, the distribution of counterfeit products has been regarded as a problem for items other than certified items and securities. Therefore, the opportunity to apply the above-described anti-counterfeiting technology with respect to certified articles and securities is increasing.

    By the way, many display bodies used as anti-counterfeit labels have a problem that it is relatively easy for an observer to apply anti-counterfeiting technology. If the application of the anti-counterfeit technology is realized, there is a high possibility that the display body is illegally copied or altered. That is, an excellent anti-counterfeit effect cannot be achieved. Here, the fact that counterfeiting or counterfeiting is difficult, and the fact that it is easy to distinguish from counterfeiting or counterfeiting are called anti-counterfeiting effects.

In order to solve such a problem, a hologram in which interference fringes having a pitch for diffracting infrared light or ultraviolet light are recorded has been proposed. (Non-Patent Document 1)
However, since what is proposed in Non-Patent Document 1 is a Lippmann hologram, the display body itself becomes thick. And when this is used as an adhesive label, its presence can be recognized by the thickness, and it is easy to realize that anti-counterfeiting technology has been applied. Also, because of its thickness, it is difficult to cut into paper.

JP 2005-91699 A Japanese Patent Laid-Open No. 06-110382

  The present invention has been made based on such circumstances, it is thin enough to be stuck or rubbed into paper, etc., and by emitting only diffracted light by ultraviolet light, a higher anti-counterfeit effect An object of the present invention is to provide a display body capable of realizing the above.

  In one aspect of the present invention, one main surface includes an interface portion in which a plurality of concave portions or convex portions arranged one-dimensionally or two-dimensionally are provided at a center-to-center distance of 150 nm to 200 nm. A plurality of recesses or protrusions arranged in a one-dimensional or two-dimensional manner, comprising: a light transmission layer; and an inorganic thin film layer covering at least a part of an interface portion of the light transmission layer. Is a display body characterized by diffracting ultraviolet light.

  The invention according to claim 2 of the present invention is the display body according to claim 1, wherein the inorganic thin film layer is made of metal.

  The invention according to claim 3 of the present invention is the display body according to claim 1, wherein the inorganic thin film layer is made of a metal compound.

  The invention according to claim 4 of the present invention comprises the display body according to any one of claims 1 to 3 and an adhesive layer provided on the display body. It is.

The invention according to claim 5 of the present invention comprises the display body according to any one of claims 1 to 3 and a support layer that releasably supports the display body. Transfer foil.

An invention according to claim 6 of the present invention is a labeled article comprising the display body according to any one of claims 1 to 3 and an article supporting the display.

The invention according to claim 7 of the present invention is a discriminating device for discriminating a discrimination target object between a genuine product and a non-genuine product, a light source that emits ultraviolet light, a detector, and the discrimination An authentication device comprising an output unit for outputting discrimination information of an object so that an image of diffracted light of ultraviolet light emitted from the discrimination object can be observed.

  According to the present invention, it is possible to realize a higher anti-counterfeit effect than a conventional display using visible light. Moreover, a display body having a smaller thickness than that of the Lippmann hologram could be provided.

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. The perspective view which expands and shows an example of the structure employable for the uneven | corrugated structure area | region of the display body shown in FIG.1 and FIG.2. The perspective view which expands and shows the other example of the structure which can be employ | adopted as the uneven | corrugated structure area | region of the optical element shown in FIG.1 and FIG.2. The figure which shows a mode that an uneven | corrugated structure area | region emits diffracted light roughly. Sectional drawing which shows schematically the adhesive label which concerns on 1 aspect of this invention. The top view which shows an example of a labeled article schematically. Sectional drawing along the III-III line of the display body shown in FIG. The top view which shows roughly another example of the articles | goods with a label. Schematic which shows an example of the discrimination | determination apparatus for discriminating the articles | goods whose authenticity is unknown between a genuine article and a non-authentic article.

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

  FIG. 1 is a plan view schematically showing a display body according to one aspect of the present invention. 2 is a cross-sectional view taken along the line II-II of the display shown in FIG. In addition, in the display body 10 of FIG. 1, the mode observed from the light transmission layer 11 side is shown.

The display body 10 includes a laminate of a light transmission layer 11 and an inorganic thin film layer 13. In the example illustrated in FIG. 2, one main surface of the light transmission layer 11 includes an uneven structure region 12 a and a non-recessed structure region 12 b. As will be described later, the concavo-convex structure region 12a is provided with a plurality of concave portions or convex portions. The plurality of concave portions or convex portions emit diffracted light in a specific direction when irradiated with ultraviolet light. The non-structural region 12b is a flat surface.
Further, an inorganic thin film layer 13 is formed on the main surface of the light transmission layer 11 including the concavo-convex structure region 12a so as to cover at least a part of the concavo-convex structure region 12a. Hereinafter, the light transmission layer 11 side is referred to as “front surface”, and the inorganic thin film layer 13 side is referred to as “back surface”.

Next, a structure that can be used for the uneven structure region 12a will be described. As described above, the concave-convex structure region 12a is provided with a plurality of concave portions or convex portions.
As described above, the non-relief structure region 12b is a flat surface. Further, the non-relief structure region 12b can be omitted.

Further, the term “inorganic thin film layer” means a layer made of a metal or a metal compound. When it is desired to color the concavo-convex structure region of the display body 10, a metal is used as the inorganic thin film layer, and when it is desired to use the display body 10 while being transparent, a metal compound is used as the inorganic thin film layer.

FIG. 3 is an enlarged perspective view showing an example of a structure that can be employed in the concavo-convex structure region 12a of the display body 10 shown in FIGS. In the example shown in FIG. 3, the recesses or projections RP are two-dimensionally arranged.
The concave portions or the convex portions RP arranged in the concavo-convex structure region 12a are regularly arranged within a range of a center-to-center distance of 150 nm to 200 nm. Therefore, as will be described in detail later, the concavo-convex structure region 12a can emit diffracted light only in a specific direction and angle when irradiated with ultraviolet light.

  The arrangement of the plurality of concave portions or convex portions RP forms, for example, a square lattice, a rectangular lattice, or a triangular lattice. By controlling the arrangement of the concave portions or the convex portions RP, it is possible to arbitrarily adjust the emission angle, the emission direction, and the like of the diffracted light emitted from the concavo-convex structure region 12a. As an example, FIG. 3 illustrates a case where a plurality of convex portions are two-dimensionally arranged in the X and Y directions perpendicular to each other to form a square lattice.

In addition, each of the concave portion or the convex portion RP can have various shapes.
Each of the recesses or projections RP preferably has a forward tapered shape such as a pyramid, a cone, and a semi-spindle shape. By having the forward taper shape, when the concavo-convex structure region 12a is observed from the normal direction, the reflectance of the regular reflection light of the concavo-convex structure region 12a can be further reduced.

FIG. 4 is an enlarged perspective view showing another example of a structure that can be adopted in the uneven structure region 12a of the display body shown in FIGS. In the example shown in FIG. 4, the concave portion or the convex portion RP is a relief type diffraction grating in which a plurality of grooves are arranged one-dimensionally.
In this case, by controlling the lattice constant, orientation, depth, and the like of the plurality of grooves, it is possible to arbitrarily adjust the emission angle and the emission direction of the diffracted light emitted from the concavo-convex structure region 12a. .

  The concave portion or the convex portion RP is arranged with a center-to-center distance of 150 nm to 200 nm. In this case, as will be described later, it is relatively easy to distinguish between genuine products and non-genuine products by detecting diffracted light emitted from the concavo-convex structure region 12a.

  Further, the depth or height of the concave portion or the convex portion RP is set to be substantially constant in order to suppress light scattering. The depth or height of the concave portion or convex portion RP is typically 50 nm or more.

  The concave portion or convex portion RP can be formed, for example, by pressing a mold provided with fine convex portions or concave portions against the resin. For example, the concave portion or the convex portion RP is obtained by a method in which the original plate provided with the convex portion or the concave portion is pressed against a thermoplastic resin layer provided on the substrate while applying heat, that is, a hot embossing method. It is done. Alternatively, the concave portion or the convex portion RP is formed by applying an ultraviolet curable resin on the substrate, irradiating the ultraviolet ray from the substrate side while pressing the original plate on the substrate, curing the ultraviolet curable resin, and then removing the original plate. It is also possible to form.

  This original plate is manufactured using, for example, an electron beam drawing apparatus. Usually, a reverse plate is manufactured by transferring the concavo-convex structure of the original plate, and a duplicate plate is manufactured by transferring the concavo-convex structure of the reverse plate. Then, if necessary, an inverted plate is manufactured using the replica plate as an original plate, and a replica plate is further manufactured by transferring the uneven structure of the inverted plate. In actual production, a copy obtained in this way is usually used.

  By obtaining the concavo-convex structure by the method as described above, the display body 10 can be typically made as thin as 50 μm or less.

As a material of the light transmission layer 11, for example, a transparent material can be used.
For example, an acrylic resin, a polycarbonate resin, a styrene resin, or an acrylic / styrene copolymer resin can be used as the above thermoplastic resin or ultraviolet curable resin. Alternatively, inorganic materials containing silicates may be used

  The inorganic thin film layer 13 covers the whole or a part of the main surface provided with the concave structure and / or the convex structure of the light transmission layer 11. The inorganic thin film layer 13 is a layer made of a metal or a metal compound.

  As the inorganic thin film layer 13 made of metal, for example, a layer made of a metal material such as aluminum, silver, gold, platinum, iron, chromium, zinc, and alloys thereof can be used. The numbers in the parentheses indicate the refractive index of each metal material.

The inorganic thin film layer 13 made of metal can be formed by, for example, a vapor deposition method. For example, it can be formed by vapor deposition or sputtering.
In addition, the design property different from the case where it coat | covers the whole can be provided by coat | covering the reflection layer 13 only in a part of uneven | corrugated structure area | region 12a.

  As the inorganic thin film layer 13 made of a metal compound, for example, an alloy, a metal oxide such as titanium oxide and alumina, a metal sulfide such as zinc sulfide, or a metal nitride can be used.

  The inorganic thin film layer 13 made of a metal compound can be formed, for example, by vapor deposition of the inorganic material. For example, a vacuum deposition method, a sputtering method, or an ion plating method can be used.

  The display body 10 displays the image demonstrated below, for example, when the inorganic thin film layer 13 is made into a layer which consists of metals, and the whole surface is illuminated with white light.

  In the concavo-convex structure region 12a, the interface between the light transmission layer 11 and the inorganic thin film layer 13 made of metal includes fine concave portions or convex portions RP arranged two-dimensionally. Therefore, most of the light incident on the concavo-convex structure region 12a is reflected a plurality of times at the interface between the light transmission layer 11 and the inorganic thin film layer 13 made of metal. As a result, most of the incident light is absorbed, and the concavo-convex structure region 12a does not emit reflected light or emits weak reflected light in a direction perpendicular to the display surface.

  Since the distance between the centers of the recesses or the protrusions RP is in the range of 150 nm to 200 nm, diffracted light is not emitted in the direction perpendicular to the display surface. Therefore, the concavo-convex structure region 12a is colored and displayed. In the non-relief structure region 12b, the interface between the light transmission layer 11 and the inorganic thin film layer 13 made of metal is flat. Therefore, when the regular reflection light can be observed, the non-concave structure region 12b displays white as the light source color.

  Therefore, when viewed from a direction perpendicular to the display surface, the display body 10 appears as if the concavo-convex structure region 12a is a printed pattern formed using colored ink when the inorganic thin film layer 13 is a layer made of metal, The uneven structure region 12b appears white.

  The display 10 is transparent or almost transparent when the inorganic thin film layer 13 is a layer made of a metal compound and the entire surface is illuminated with white light.

  In the concavo-convex structure region 12a, the interface between the light transmission layer 11 and the inorganic thin film layer 13 made of a metal compound is regularly arranged at a center-to-center distance of 150 nm to 200 nm. Therefore, the concavo-convex structure region 12a emits diffracted light only when irradiated with ultraviolet light, and does not emit diffracted light otherwise. Therefore, under the condition where the diffracted light is not detected, the concavo-convex structure region 12a is observed in substantially the same manner as the non-concave structure region where the interface between the light transmission layer 11 and the inorganic thin film layer 13 made of a metal compound is a flat surface. . That is, under this condition, it is difficult to distinguish the uneven structure region 12a and the non-relief structure region 12b from each other. Therefore, under this condition, it is difficult to realize that the display body 10 is provided for the purpose other than anti-counterfeiting such as a transparent protective layer, that is, that the anti-counterfeiting technology is applied to the display body 10.

  The display body 10 may further include a print layer. When the inorganic thin film layer 13 is a layer made of metal, the print layer is formed on the front side of the light transmission layer 11, for example. When the inorganic thin film layer 13 is a layer made of a metal compound, the printing layer is, for example, the front side of the light transmission layer 11, between the light transmission layer 11 and the inorganic thin film layer 13 made of a metal compound, or from a metal compound. It forms in the back side of the inorganic thin film layer 13 which becomes.

  In these cases, the display body 10 looks like a normal printed material under the condition where the diffracted light described above is not detected. Therefore, by providing the display body 10 with the print layer, it is possible to make it difficult to realize that the display body 10 is applied with the forgery prevention technology.

  In addition, the display body 10 may further include a transparent hologram layer. When the inorganic thin film layer 13 is a layer made of metal, the transparent hologram layer is formed on the front side of the light transmission layer 11, for example. When the inorganic thin film layer 13 is a layer made of a metal compound, the transparent hologram layer is, for example, the front side of the light transmission layer 11, between the light transmission layer 11 and the inorganic thin film layer 13 made of a metal compound, or metal It forms in the back side of the inorganic thin film layer which consists of a compound.

  Further, the display body 10 may further include a hologram layer on which vapor deposition has been performed. In this case, the inorganic thin film layer 13 is a layer made of a metal compound, and the vapor deposition hologram layer is formed on the back side of the inorganic thin film layer made of the metal compound.

  In these cases, the display body 10 emits the diffracted light of the hologram in a specific direction and angle under the condition that the front surface is irradiated with white light, so that it looks like a normal hologram. Therefore, by providing the display body 10 with the hologram layer, it is possible to make it difficult to realize that the display body 10 is applied with a forgery prevention technique other than the hologram.

  Next, the visual effect of the display body 10 caused by the uneven structure region 12a will be further described.

  FIG. 5 is a diagram schematically showing how the concavo-convex structure region 12a emits diffracted light. In FIG. 5, L1 indicates illumination light, L2 indicates regular reflection light or zero-order diffracted light, and L3 indicates first-order diffracted light.

  In the concavo-convex structure region 12a, the concave portions or the convex portions RP are regularly arranged. Therefore, when the concavo-convex structure region 12a is irradiated, strong diffracted light is emitted in a specific direction with respect to the traveling direction of the illumination light that is incident light.

  The most representative diffracted light is first-order diffracted light. The second-order or higher-order diffracted light has a significantly smaller intensity than the first-order diffracted light. For this reason, the influence of high-order diffracted light on detection is negligibly small.

The emission angle β of the first-order diffracted light can be calculated from Equation 1 when the light travels in a plane parallel to the normal line N of the concavo-convex structure region 12a.
In Equation 1, d represents the distance between the centers of the concave or convex portions RP, and λ represents the wavelengths of incident light and diffracted light. Α represents the exit angle of 0th-order diffracted light, that is, transmitted light or specularly reflected light.

The angles α and β define a clockwise direction from the normal N as a positive direction. An angle range of −90 ° to 0 ° with respect to the normal N is referred to as a “negative angle range”, and an angle range of 0 ° to 90 ° is referred to as a “positive angle range”. Further, it is assumed that the emission angle α belongs to a positive angle range. That is, it is assumed that 0 ° <α <90 °.

  As is clear from Equation 1, the exit angle β of the first-order diffracted light changes according to the wavelength λ. Further, as can be seen from the mathematical formula, when the inter-center distance d is smaller than the wavelength λ of the incident light, the emission angle β can be a negative value with respect to an arbitrary incident angle −α. That is, in this case, when the incident light L1 belongs to the negative angle range, the first-order diffracted light L3 also belongs to the negative angle range.

  The display 10 of the present invention is to be detected under ultraviolet light, and “ultraviolet light” refers to near ultraviolet light having a wavelength of about 300 nm to 380 nm.

With respect to the “ultraviolet light” defined above, for example, when the display body 10 is irradiated with ultraviolet light having a peak at a wavelength of 300 nm, the distance between the centers of the concave portions or convex portions of the concavo-convex structure region 12a is 153 nm or more, so Is injected. This is clear from Equation 1.
Further, when the “ultraviolet light” is ultraviolet light having a peak at a wavelength of 380 nm, if the distance between the centers of the concave or convex portions of the concavo-convex structure region 12a of the display body 10 is 203 nm or less, visible light is visible on the display body 10 Even if light in the region is incident, diffracted light is not emitted, and diffracted light is emitted only for ultraviolet light. Therefore, the distance between the centers of the concave portions or convex portions of the concavo-convex structure region 12a of the display body 10 is set in the range of 150 nm to 200 nm.

  As described above, the concave-convex structure region 12a of the display body 10 has a concave-convex or convex-center distance within a range of 150 nm to 200 nm. Therefore, when observed from the normal direction, the inorganic thin film layer is a layer made of metal. In some cases, it looks like a printed pattern formed using a colored ink, and when the inorganic thin film layer is a layer made of a metal compound, it looks transparent or almost transparent. When ultraviolet rays are irradiated from a certain oblique direction, diffracted light is detected.

FIG. 6 is a cross-sectional view schematically showing an adhesive label according to one embodiment of the present invention.
The adhesive label 20 includes a display body 10 and an adhesive layer 21 provided on the display body 10.
FIG. 6 shows a case where the adhesive layer 21 is provided on the back surface (on the surface of the inorganic thin film layer 13) of the display body 100 shown in FIG. 2 as an example.

When the adhesive layer 21 is provided, the surface of the inorganic thin film layer 13 can be prevented from being exposed. Therefore, by using the display body 10 as a part of the pressure-sensitive adhesive label 20, it is possible to make it more difficult to duplicate the concave portion or the convex portion at the previous interface.
In the display body 10, when the light transmission layer 11 side is the back surface side and the inorganic thin film layer 13 side is the front surface side, the adhesive layer 21 is formed on the light transmission layer 11.

  The adhesive label 20 is attached to, for example, an article whose authenticity is to be confirmed, or is attached to another article such as a tag base material to be attached to such an article. Thereby, the forgery prevention effect can be provided to the said article | item.

FIG. 7 depicts a plan view of a printed material 30 as an example of a labeled article. FIG. 8 is a cross-sectional view of the display body 10 shown in FIG.
The printed material 30 is an ID (identification) card and includes a base material 31. The base material 31 is made of plastic, for example. A printed layer 40 is formed on the substrate 31. The display body 10 mentioned above is being fixed to the surface in which the printing layer 40 of the base material 31 was formed, for example through the adhesion layer. For example, the display body 10 is prepared as an adhesive sticker or a transfer foil, and is fixed to the base material 31 by pasting it on the printing layer 40.

  The printed material 30 includes the display body 10 described above. The display body 10 includes a hologram layer as one embodiment of the present invention. Therefore, when this printed matter 30 is irradiated with white light, only the diffracted light from the hologram is visible. Further, when the printed material 30 is irradiated with ultraviolet light, confidential information is detected by the diffracted light from the concavo-convex structure region 12.

  In FIG. 7, an ID card is illustrated as a printed material including the display body 10, but the printed material including the display body 10 is not limited thereto. For example, the printed matter including the display body 10 may be other cards such as a magnetic card, a wireless card, and an IC (integrated circuit) card. Alternatively, the printed matter including the display body 10 may be securities such as gift certificates and stock certificates as shown in FIG. Alternatively, the printed matter including the display body 10 may be a tag attached to an article to be confirmed as a genuine product. Alternatively, the printed matter including the display body 10 may be a package body that contains an article to be confirmed to be genuine or a part thereof.

  Moreover, in the printed matter 30 shown in FIG. 7, although the display body 10 is affixed on the base material 31, the display body 10 can be supported on a base material by another method. For example, when paper is used as the base material, the display body 10 may be rolled into the paper and the paper may be opened at a position corresponding to the display body 10. Alternatively, when a light-transmitting material is used as the base material, the display body 10 may be embedded therein, or the display body 10 may be fixed to the back surface of the base material, that is, the surface opposite to the display surface. .

  The display body 10 may be used for purposes other than forgery prevention. For example, the display body 10 can be used as a toy, a learning material, or a decoration.

  FIG. 10 is a schematic diagram illustrating an example of a determination device for determining an article whose authenticity is unknown between a genuine product and a non-authentic product.

  The determination device 40 includes a support base (not shown), an ultraviolet light source 42, a light shielding unit 43, a detector 44, and an output unit 45. In FIG. 10, a labeled article 41 including the optical element 10 is drawn as an article whose authenticity is to be determined.

  The support table plays a role of fixing the labeled article 41 at a predetermined position. You may further provide the mechanism for aligning the position of the display body 10 of the labeled article 41, and the irradiation position of the ultraviolet light which the ultraviolet light source 42 radiates | emits. In this case, discrimination between genuine products and non-genuine products can be performed with higher accuracy.

  The ultraviolet light source 51 plays a role of radiating ultraviolet light to a portion of the labeled article 41 where the display body 10 should be provided if it is a genuine product. As the ultraviolet light source 41, for example, an ultraviolet irradiation device such as a mercury lamp or a metal halide lamp, or a black light can be used.

  The detector 44 has a role of detecting diffracted light emitted from the display body 10. That is, the detector 44 plays a role of outputting information indicating whether or not diffracted light has been detected to the output unit 45 when the ultraviolet light source 42 irradiates the labeled article 41 with ultraviolet light.

  As the detector 44, for example, a highly sensitive cooled CCD camera can be used. Further, a CCD camera in which a fluorescent material is applied to the pixels may be used.

  The light blocking unit 43 plays a role of blocking light leakage between the ultraviolet light source 42 and the detector 44. By providing the light shielding part 43, noise in the detector 44 is reduced, and the accuracy of determining the authenticity of the labeled article 41 is improved. The light shielding portion 43 may be omitted.

The output unit 45 plays a role of outputting discrimination information corresponding to the output of the detector 44. For example, when the detector 44 does not detect the diffracted light from the display body 10, the output unit 45 outputs discrimination information indicating that the labeled article 41 is a non-authentic product. Or when the detector 44 detects the diffracted light from the display body 10, the discriminating information which shows that the labeled article 41 is a genuine article is output. This discrimination information is transmitted to the user, for example, visually, audibly, or by tactile sensation such as vibration.

<Example 1: Production of display body D1>
The display body 10 was manufactured as follows.
First, an ultraviolet curable resin was applied on a polyethylene terephthalate film (hereinafter referred to as PET film) having a thickness of 25 μm.
Next, the ultraviolet curable resin was cured by irradiating ultraviolet rays from the PET film side while pressing the original plate provided with a plurality of convex portions on the other side against the previous coating film.
Thereafter, the original plate was removed to obtain a light transmission layer 11 having a plurality of concave structures. Here, the depth of the concave portion is 400 nm, and the distance between the centers of the concave portions is 200 nm.
Next, the inorganic thin film layer 13 was formed by depositing aluminum on the main surface of the light transmission layer 11 on the concave structure side by a vacuum deposition method. The thickness of the inorganic thin film layer was about 40 nm.

  The display body 10 was obtained as described above. Hereinafter, this display body is referred to as “display body D1”.

<Example 2: Production of display body D2>
A display body was manufactured in the same manner as described for the display body D1 except that the distance between the centers of the recesses was set to 200 nm instead of the distance being 160 nm. Hereinafter, this display body is referred to as “display body D2”.

<Example 3: Production of display body D3>
Instead of setting the distance between the centers of the recesses to 200 nm, a display body was manufactured in the same manner as described for the display body D1 except that the distance was 240 nm. Hereinafter, this display body is referred to as “display body D3”.

The display bodies D1 to D3 manufactured as described above were irradiated with an ultraviolet light source (having a peak at 365 nm) and a white light source at an angle of 60 degrees with respect to the normal N, and diffracted light was detected. The results are shown in Table 1.

As shown in Table 1, with respect to the display body D1, the diffracted light of the ultraviolet light was detected at an angle near 75 degrees with respect to the normal N, but the diffracted light due to the irradiation of the white light source was not visually recognized. Further, with respect to D2, ultraviolet diffracted light was not detected, and diffracted light due to irradiation with a white light source was not visually recognized. Further, regarding D3, the diffracted light of the ultraviolet light was detected at an angle of 40 degrees with respect to the normal line N, but the diffracted light by the irradiation of the white light source was also visually recognized.

DESCRIPTION OF SYMBOLS 10 ... Display body, 11 ... Light transmissive layer, 12a ... Uneven structure area, 12b ... Non-uneven structure area, 13 ... Inorganic thin film layer,
L1: Illumination light, L2: Regular reflection light or 0th order diffracted light, L3: 1st order diffracted light, N ... Normal 20 ... Adhesive label, 21 ... Adhesive layer, 22 ... Hologram layer, 22a ... Hologram area 30 ... Printed matter, 31 ... Substrate, 32 ... printed layer, 33 ... magnetic recording layer 40 ... discriminating device, 41 ... labeled article, 42 ... ultraviolet light source, 43 ... light shielding unit, 44 ... detector, 45 ... output unit

Claims (6)

  A light-transmitting layer having one principal surface including an interface portion in which a plurality of concave or convex portions arranged one-dimensionally or two-dimensionally are provided at a center-to-center distance of 150 nm to 200 nm; and an interface between the light-transmitting layers A display body comprising an inorganic thin film layer covering at least a part of a portion, wherein the plurality of concave portions or convex portions arranged one-dimensionally or two-dimensionally diffract ultraviolet light body.   The display body according to claim 1, wherein the inorganic thin film layer is made of metal.   The display body according to claim 1, wherein the inorganic thin film layer is made of a metal compound.   An adhesive label comprising the display body according to claim 1 and an adhesive layer provided on the display body.   A transfer foil comprising: the display body according to claim 1; and a support layer that releasably supports the display body.   A labeled article comprising the display body according to any one of claims 1 to 3 and an article supporting the display body.