JP2012192568A - Displaying body and method for determining authenticity - Google Patents

Abstract

Provided are a display body and an authenticity determination method having a high anti-counterfeit effect.
A display according to the present invention includes a first interface portion provided with a plurality of first concave portions or convex portions configured to emit directional scattered light when illuminated with white light, and And a second interface portion provided with a plurality of second concave portions or convex portions configured to be birefringent and adjacent to the first interface portion. The first direction in which the first interface portion exhibits the maximum light scattering ability and the second direction parallel to the slow axis of the second interface portion are parallel to each other or intersect at a predetermined angle. .
[Selection] Figure 2

Description

  The present invention relates to a display body and a true / false determination method.

  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.

  2. Description of the Related Art Conventionally, various configurations have been known as a display body that has been subjected to anti-counterfeit technology (see, for example, Patent Documents 1 to 7). In addition, although application to anti-counterfeiting technology is not intended, in recent years, studies on optical effects using structural birefringence have been made (for example, see Non-Patent Documents 1 and 2).

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 and a true / false determination method having a high anti-counterfeit effect.

  According to the first aspect of the present invention, the first interface portion provided with a first plurality of concave portions or convex portions configured to emit directional scattered light when illuminated with white light, and the first A second interface portion provided with a plurality of second concave portions or convex portions that are adjacent to the interface portion and exhibit birefringence, and the first interface portion has the maximum light scattering ability. A display body is provided in which the first direction shown and the second direction parallel to the slow axis of the second interface portion are parallel to each other or intersect each other at a predetermined angle.

  According to the second aspect of the present invention, there is provided a method for determining the authenticity of a display body according to the first aspect, wherein at least a portion corresponding to the second interface portion of the display body is observed through a linear polarizer. A true / false determination method including the above is provided.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the display body and authenticity determination method with a high forgery prevention effect.

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 shows schematically an example of a structure of the interface part which can inject | emit directional scattered light. The top view which shows the example at the time of observing the display body shown in FIG.1 and FIG.2 from another direction. The top view which shows an example at the time of observing the display body shown in FIG.1 and FIG.2 through a linear polarizer. The top view which shows the other example at the time of observing the display body shown in FIG.1 and FIG.2 through a linear polarizer. The top view which shows schematically the display body which concerns on the other aspect of this invention. The top view which shows an example at the time of observing the display body shown in FIG. 7 through a linear polarizer. The top view which shows the other example at the time of observing the display body shown in FIG. 7 through a linear polarizer. The top view which shows the other example at the time of observing the display body shown in FIG. 7 through a linear polarizer.

  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. 1 and 2, 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 and 2 includes a display unit DP1A, a display unit DP1B, a display unit DP2, and a display unit DP3. The display body 100 includes a relief layer 10, a light reflective material layer 20, and an adhesive layer 30. 1 and 2 illustrate a case where the relief layer 10 is positioned on the front side with respect to the light reflective material layer 20 as an example.

  The interface between the relief layer 10 and the light reflective material layer 20 includes an interface part IP1A, an interface part IP1B, an interface part IP2, and an interface part IP3. The interface portions IP1A, IP1B, IP2, and IP3 correspond to the display portions DP1A, DP1B, DP2, and DP3, respectively.

  A plurality of concave portions or convex portions are provided on one main surface of the relief layer 10. As a material for the relief 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 concave portions or convex portions can be easily formed by transfer using an original plate. Therefore, in this case, if a plurality of concave portions or convex portions are formed on the original plate with high accuracy, a precise mass-produced replica can be manufactured relatively easily.

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

  The light reflective material layer 20 covers at least a part of the main surface of the relief layer 10 provided with a plurality of concave portions or convex portions. By providing this layer, the optical effect due to the plurality of concave portions or convex portions can be made more remarkable.

  Examples of the material of the light reflective material layer 20 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 relief layer 10 may be used as the material of the light reflective material layer 20. The light reflective material layer 20 may have a single layer structure or a multilayer structure.

  The light reflective material layer 20 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 20 by spatially distributing the region where the light-reflective material layer 20 exists.

  The adhesive layer 30 is provided on the back side of the light reflective material layer 20 and faces the relief layer 10 with the light reflective material layer 20 interposed therebetween. Examples of the material for the adhesive layer 30 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. The adhesive layer 30 may be omitted.

  As described above, the interface between the relief layer 10 and the light reflective material layer 20 includes the interface portions IP1A, IP1B, IP2, and IP3. Hereinafter, these configurations and optical effects will be described.

The interface portion IP1A includes a plurality of concave portions or convex portions configured to emit directional scattered light when illuminated with white light. Here, “directional scattered light” means scattered light having different light scattering capabilities depending on the observation direction. Here, the “light scattering ability” means the size of an angle range in which scattered light having a certain intensity or more is emitted.
Hereinafter, the direction in which the interface portion exhibits the maximum light scattering ability is referred to as “high scattering direction”, and the direction in which the minimum light scattering ability is indicated is referred to as “low scattering direction”. The high scattering direction and the low scattering direction are typically orthogonal to each other.

  The interface part IP1A has anisotropy with respect to the light scattering ability. Therefore, for example, under the condition that the display unit DP1A is illuminated from an oblique direction perpendicular to the low scattering direction of the interface unit IP1A and the display unit DP1A is observed from the front, the display unit DP1A has high light scattering at the interface unit IP1A. It looks relatively bright due to Noh. On the other hand, under the condition that the display portion DP1A is illuminated from an oblique direction perpendicular to the high scattering direction of the interface portion IP1A and the display portion DP1A is observed from the front, the display portion DP1A is caused by the low light scattering ability of the interface portion IP1A. And it looks relatively dark.

  FIG. 3 is a perspective view schematically showing an example of the configuration of the interface portion that can emit directional scattered light. FIG. 3 illustrates a case where the interface portion IP1A includes a plurality of concave portions or convex portions that are each linear and have the same direction in the plane. In the example shown in FIG. 3, the high scattering direction is parallel to the X axis and the low scattering direction is parallel to the Y axis.

When the interface portion IP1A is a straight line and includes a plurality of concave portions or convex portions whose directions are aligned in the plane, these length l, width d, height or depth h, and interval p At least one is preferably random.
The average value of the lengths 1 of the recesses or projections is, for example, 10 μm or more. The average value of the width d is, for example, in the range of 0.1 to 10 μm. The average value of the depth or height h is, for example, in the range of 0.1 to 10 μm, and typically in the range of 0.1 to 0.4 μm. The average value of the space | interval p between a recessed part or a convex part shall be in the range of 0.1-10 micrometers, for example.

  The interface portion IP1B is adjacent to the interface portion IP1A. In the example shown in FIGS. 1 and 2, the interface portion IP1B is adjacent to the interface portion IP1A.

  The interface portion IP1B includes a plurality of concave portions or convex portions configured to emit directional scattered light when illuminated with white light. The interface portion IP1B has the same configuration as the interface portion IP1A except that the high scattering directions are different from each other. In the example shown in FIGS. 1 and 2, the high scattering directions of these interface portions are orthogonal to each other. The interface part IP1B may be omitted.

  When the display body 100 includes the interface portion IP1B, the display portion DP1A and the display portion DP1B typically exhibit different brightness when observed from a specific observation direction. Therefore, for example, a desired image can be displayed on the display body 100 by comparing these display units.

  The interface part IP2 is adjacent to the interface parts IP1A and IP1B. In the example shown in FIGS. 1 and 2, the interface portion IP2 is adjacent to the interface portion IP1A with an interface portion IP3 described later interposed therebetween.

  The interface portion IP2 includes a plurality of concave portions or convex portions configured to exhibit birefringence. The plurality of concave portions or convex portions constituting the interface portion IP2 has the slow axis of the interface portion IP2 parallel to the high scattering direction of the interface portion IP1A or intersects the high scattering direction at a predetermined angle. It is provided as follows. This facilitates authenticity determination of the display body 100 as will be described later.

  It is preferable that the slow axis of the interface portion IP2 is parallel to the high scattering direction of the interface portion IP1A or orthogonal to the high scattering direction. This further facilitates the authenticity determination of the display body 100, as will be described later. This also facilitates the design and formation of a plurality of concave portions or convex portions constituting each of the interface portions IP1A and IP2.

  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 grooves 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 grooves arranged in parallel to each other along the Y axis.

  The plurality of concave portions or convex portions provided in the interface portion IP2 exhibit birefringence based on, for example, the 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 part IP2 includes a plurality of grooves parallel to each other. Hereinafter, polarized light that vibrates perpendicularly to the groove 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 grooves 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)
TE polarized light: n _TE = {(1-f) n ₁ ² + fn ₂ ² } ^1/2 (2)
TM polarization: n _TM = [n ₁ ² n ₂ ² / {fn ₁ ² + (1-f) n ₂ ² }] ^1/2 (3)
Where
n ₁ represents the refractive index of the outside world in contact with the layer provided with the plurality of grooves.
n ₂ represents the refractive index of the layer in which a plurality of grooves are provided.
f represents the ratio of the width of each groove 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 grooves generates a phase difference δ represented by the following formula (4).

δ = (n _TE −n _TM ) h (4)
In the formula, h represents the depth of the plurality of grooves. 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 concave portions or convex portions arranged one-dimensionally, the average period d is preferably in the range of 200 nm to 500 nm, and preferably in the range of 250 nm to 400 nm. More preferred. 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 concave portions or convex portions arranged one-dimensionally, the average height or depth h is preferably in the range of 50 nm to 200 nm, preferably in the range of 70 nm to 140 nm. More preferably. When such a configuration is adopted, the brightness change according to the direction of the absorption axis of the linear polarizer becomes larger when observed through a linear polarizer described later.

  The interface portion IP3 is adjacent to each interface portion described above. Interface part IP3 consists of a flat surface. The interface part IP3 may be omitted.

  In the example shown in FIGS. 1 and 2, the interface portion IP3 is adjacent to the interface portion IP2. When such a configuration is adopted, it is difficult to recognize the presence of the interface portion IP2. Therefore, forgery of the display body 100 becomes more difficult.

  As described above, the display body 100 exhibits birefringence with the interface portion IP1A provided with a plurality of concave portions or convex portions configured to emit directional scattered light when illuminated with white light. And an interface portion IP2 provided with a plurality of configured concave or convex portions.

  As is clear from the above description, the brightness of the display portion DP1A corresponding to the interface portion IP1A changes according to the observation direction. This change can be visually recognized by an observer. On the other hand, 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 observation direction. Therefore, in the display body 100, double authenticity determination can be performed by combining confirmation by visual observation and confirmation by observation through a linear polarizer. Therefore, the display body 100 has a high anti-counterfeit effect.

  FIG. 4 is a plan view showing an example when the display body 100 shown in FIGS. 1 and 2 is observed from another direction. As shown in FIG. 4, the brightness difference between the display portion DP1A and the display portion DP1B can be changed by changing the observation direction of the display body 100.

  Such a change in brightness can be confirmed visually. Therefore, the display body 100 can achieve a relatively high anti-counterfeit effect simply by visually observing it. This makes it possible to camouflage the function of birefringence imparted by the interface part IP2. That is, since the person who tries to counterfeit the display body 100 is made to pay attention to the brightness change by visual observation mentioned above, the interface part IP2 of the display body 100 is provided with the further function of birefringence. It is hard to notice. Therefore, the display body 100 is difficult to forge.

  In the display body 100 described above, both of the interface portions IP1A and IP2 include a plurality of concave portions or convex portions. 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.

  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. 5 is a plan view showing an example when the display shown in FIGS. 1 and 2 is observed through a linear polarizer. FIG. 6 is a plan view showing another example when the display body shown in FIGS. 1 and 2 is observed through a linear polarizer. In FIGS. 5 and 6, changes in brightness other than the display portion DP2 are not shown.

  A linear polarizer 200 shown in FIG. 5 has an absorption axis A parallel to the X axis. A linear polarizer 200 shown in FIG. 6 has an absorption axis A parallel to the Y axis.

  When the arrangement of the display body 100 and the linear polarizer 200 has the relationship shown in FIG. 5, the display unit DP2 looks relatively bright when observed through the linear polarizer 200. When the arrangement of the display body 100 and the linear polarizer 200 is the relationship shown in FIG. 6, the display unit DP2 looks relatively dark 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 absorption 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 described above, the plurality of concave portions or convex portions constituting the interface portion IP2 has the slow axis of the interface portion IP2 parallel to the high scattering direction of the interface portion IP1A or is predetermined with the high scattering direction. It is provided to intersect at an angle of. Therefore, the observer who determines the authenticity of the display body 100 can know the direction of the slow axis of the interface part IP2 with reference to the high scattering direction of the display part DP1A. That is, the observer who determines the authenticity of the display body 100 matches the direction of the absorption axis A of the linear polarizer 200 with the direction of the slow axis of the interface portion IP2 with reference to the high scattering direction of the display portion DP1A. It can be set easily. This point will be described in more detail later with reference to FIGS.

  As the linear polarizer 200, for example, a linear polarization 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.

Various modifications can be made to the display body 100 described above.
FIG. 7 is a plan view schematically showing a display body according to another aspect of the present invention. The display body 100 shown in FIG. 7 includes a display unit DP1A, a display unit DP2, and a display unit DP3 interposed therebetween.

  In the display body 100 shown in FIG. 7, the high scattering direction of the plurality of concave portions or convex portions provided in the interface portion IP1A is parallel to the Y axis. Therefore, when the display body 100 is observed from a direction parallel to the Y axis, the display unit DP1A looks bright.

  Moreover, in the display body 100 shown in FIG. 7, the slow axis of the some recessed part or convex part provided in interface part IP2 is also parallel to the Y-axis. That is, the display body 100 shown in FIG. 7 is configured such that the direction of the slow axis is parallel to the high scattering direction.

  The authenticity determination of the display body 100 shown in FIG. 7 can be performed as follows, for example.

  First, the linear polarizer is arranged so that the absorption axis of the linear polarizer and the high scattering direction are parallel to each other. At this time, an observer who determines the authenticity of the display body 100 can know the above-described high scattering direction by examining the observation angle at which the display unit DP1A looks brightest. That is, the display unit DP1A serves as a guide for determining the direction of the absorption axis of the linear polarizer.

  FIG. 8 is a plan view showing an example when the display shown in FIG. 7 is observed through a linear polarizer. In FIG. 8, the absorption axis A of the linear polarizer 200 is parallel to the Y axis. That is, the absorption axis A of the linear polarizer 200 is orthogonal to the slow axis described above. In this case, the display part DP2 of the display body 100 looks relatively dark.

Next, the direction of the absorption axis of the linear polarizer is changed.
FIG. 9 is a plan view showing another example when the display shown in FIG. 7 is observed through a linear polarizer. In FIG. 9, the absorption axis A of the linear polarizer 200 forms an angle of 45 ° with the Y axis. That is, the absorption axis A of the linear polarizer 200 forms an angle of 45 ° with the slow axis described above. In this case, the display part DP2 of the display body 100 looks brighter than the case shown in FIG. Depending on the setting of the phase difference δ described above, a darker image can be displayed on the display unit DP2 in the case shown in FIG. 9 than in the case shown in FIG. The setting of the phase difference δ can be performed, for example, by adjusting the above-described average depth or height h.

  FIG. 10 is a plan view showing another example when the display shown in FIG. 7 is observed through a linear polarizer. In FIG. 10, the absorption axis A of the linear polarizer 200 is orthogonal to the Y axis. That is, the absorption axis A of the linear polarizer 200 is orthogonal to the slow axis described above. In this case, the display part DP2 of the display body 100 looks brighter than the case shown in FIG.

  Thus, by changing the direction of the absorption axis A of the linear polarizer 200, the brightness of the display portion DP2 can be changed. In particular, under the conditions shown in FIG. 10, when viewed through the linear polarizer 200, the display portion DP2 and the display portion DP3 have substantially the same brightness. Therefore, under this condition, the display part DP2 and the display part DP3 cannot be distinguished from each other. On the other hand, the display part DP2 and the display part DP3 can be distinguished from each other under the conditions shown in FIGS. Therefore, by changing the direction of the absorption axis A of the linear polarizer 200, the displayed image can be visualized or invisible by contrast between the display unit DP2 and the display unit DP3.

  As described above, the linear polarizer 200 preferably includes a diffusion plate. This lowers the contrast between the display portion DP2 and the display portion DP3 under the conditions shown in FIG. Therefore, in this way, it is possible to make it difficult to distinguish these display portions.

  The display body 100 described with reference to FIGS. 1 to 10 has an interface portion provided with a plurality of concave portions or convex portions configured to emit directional scattered light when illuminated with white light. You may have more than one. For example, by adopting a configuration in which the high scattering direction of these interface portions changes stepwise and monotonously, an animation-like image change can be caused according to the change in the observation direction.

  In the display body 100 described with reference to FIGS. 1 to 10, each interface portion may be formed in units of cells. By arranging these cells as pixels, a display image can be easily defined. That is, this makes it easy to design the display body 100.

  In addition, when each interface part is formed in a cell unit, it is sufficiently possible to set the size of one side of the cell to about 100 μm. In this case, an image can be displayed with a fineness below the resolution of the human eye under normal observation conditions. That is, a sufficiently high-definition image can be displayed.

  The display body 100 described with reference to FIGS. 1 to 10 may be used as a part of the transfer foil. The display body 100 may be used as a part of an article with a display body such as a printed material.

  Examples of the present invention will be described below, but the present invention is not limited thereto.

The display body 100 described with reference to FIGS. 1 and 2 was manufactured as follows.
First, an ultraviolet curable resin was coated on a polyethylene terephthalate (PET) film using a gravure roll coater. This resin layer was pressed against a metal plate provided with a concavo-convex structure and irradiated with ultraviolet rays using a metal halide lamp. The metal plate was peeled from the cured resin layer to obtain a relief layer 10 having a plurality of concave portions or convex portions formed on one main surface. Aluminum was deposited on the main surface of the relief layer 10 on which a plurality of recesses or projections were formed by vacuum deposition. In this way, a light reflective material layer 20 was obtained.

  The interface between the relief layer 10 and the light reflective material layer 20 included interface portions IP1A, IP1B, IP2, and IP3. The interface portion IP1A was provided with a plurality of concave portions or convex portions that are each linear and arranged one-dimensionally. The height of the plurality of concave portions or convex portions was random within a range of 100 nm to 400 nm, and the interval was random within a range of 0.1 μm to 1 μm. The interface portion IP1B was provided with a plurality of concave portions or convex portions similar to those of the interface portion IP1A except that the high scattering direction was orthogonal. A plurality of grooves arranged one-dimensionally with a period of 300 nm were formed in the interface part IP2. The interface portion IP3 is a flat surface.

  An adhesive was applied on the light reflective material layer 20 using a gravure roll coater. In this way, an adhesive layer 30 was obtained. The obtained display body 100 was transferred to a paper substrate, and the PET film was removed. In this way, a printed matter including the display body 100 was obtained.

  First, the printed material was visually observed under normal illumination light. As a result, the display portion DP1A of the display body 100 appeared relatively bright, whereas the display portion DP1B appeared relatively dark. When the printed matter was rotated 90 ° around the Z axis and observed in the same manner, the brightness of the display portion DP1A and the display portion DP1B was reversed.

  Second, the printed material was observed through a linear polarizer. First, the linear polarizer was arranged so that the absorption axis of the linear polarizer was parallel to the high scattering direction of the interface part IP1A. Thereafter, the direction of the absorption axis of the linearly polarized light was rotated around the Z axis. As a result, the brightness of the display unit DP2 has changed.

  As described above, the printed matter including the display body 100 changes in brightness of the display image according to the change in the observation direction both when visually observed and when observed through the linear polarizer. did. Therefore, based on the observation result, it was possible to reliably determine that the printed matter was a genuine product.

  DESCRIPTION OF SYMBOLS 10 ... Relief layer, 20 ... Light reflective material layer, 30 ... Adhesive layer, 100 ... Display body, 200 ... Linear polarizer, A ... Absorption axis, DP1A ... Display part, DP1B ... Display part, DP2 ... Display part, DP3 ... Display part, IP1A ... Interface part, IP1B ... Interface part, IP2 ... Interface part, IP3 ... Interface part.

Claims (8)

A first interface portion provided with a first plurality of recesses or projections configured to emit directional scattered light when illuminated with white light, adjacent to the first interface portion, and birefringent. A second interface portion provided with a plurality of second concave portions or convex portions configured to show,
The first direction in which the first interface portion exhibits the maximum light scattering ability and the second direction parallel to the slow axis of the second interface portion are parallel to each other or intersect at a predetermined angle. Display body.   The display body according to claim 1, wherein the first direction and the second direction are parallel to each other or orthogonal to each other.   The display body according to claim 1 or 2, wherein the second plurality of concave portions or convex portions are one-dimensionally arranged with an average period of 200 nm to 500 nm.   4. The display body according to claim 1, wherein the second plurality of concave portions or convex portions are provided with an average height or depth of 50 nm to 200 nm and are arranged one-dimensionally. 5.   The display body according to claim 1, further comprising a third interface portion that is adjacent to the second interface portion and has a flat surface.   6. The authenticity determination method for a display body according to claim 1, wherein at least a portion corresponding to the second interface portion of the display body is observed through a linear polarizer. Includes true / false judgment method.   The linear polarizer is further arranged such that a third direction parallel to the absorption axis of the linear polarizer and the first direction are parallel to each other or intersect each other at a predetermined angle. The authenticity determination method described in 1.   The authenticity determination method according to claim 6 or 7, wherein the linear polarizer further includes a diffusion plate.

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