JP6277712B2 - Indicator - Google Patents

Description

  The present invention relates to a display suitable for providing anti-counterfeiting, decorative effects, and aesthetic effects.

  Articles such as securities, certificates, branded products 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.

  Many of such displays include fine structures such as diffraction gratings, holograms, and lens arrays. These microstructures are usually difficult to analyze. Moreover, in order to manufacture a display body including these fine structures, expensive manufacturing equipment such as an electron beam drawing apparatus is required. Therefore, such a display body can exhibit a high anti-counterfeit effect.

  It is also known to provide a metallic reflective layer in the form of letters, logos or other patterns to increase the visibility of such displays and to make forgery more difficult.

  Conventionally, patterning of a metal reflective layer having a patterned metal reflective layer is performed by printing a mask agent on the metal reflective layer with a positive pattern and corroding a portion not printed with the mask agent with a corrosive agent. It has been patterned by etching process to form.

  For example, a method described in Patent Document 1 is known as a processing method in which a mask agent is printed on a metal reflection layer in a positive pattern and a portion not printed with the mask agent is corroded with a corrosive agent.

  In addition, in order to form the reflective layer with high positional accuracy, the first region having a concavo-convex structure with a large depth-width ratio and the first region having a concavo-convex structure that is flat or has a smaller depth-to-width ratio. Patent Document 2 showing a relief structure forming layer including two regions is known.

JP 2005-7624 A International Publication No. 2010/147185

  In the processing method (Patent Document 1) in which a mask agent is printed in a positive pattern on a metal reflective layer and a portion not printed with the mask agent is corroded with a corrosive agent, variation in halftone dots occurs due to fading of the mask printing. A relatively large resolution (for example, 300 dpi) is the limit. Therefore, rich gradation expression is difficult with the above processing method.

  On the other hand, a display body capable of expressing smooth gradation expression with fine pixels and stepwise density transition is desired.

  An object of the present invention is to provide a display body that exhibits an anti-counterfeit effect, a decorative effect, or an aesthetic effect.

  Another object of the present invention is to provide a display body capable of expressing smooth gradation expression with fine pixels and stepwise density transition.

An example of means for solving the problems of the present invention is a display body (10) including an optical structure forming layer (16) and a reflective layer (18),
The optical structure-forming layer (16) includes a plurality of gradation component regions on its surface;
The plurality of gradation component regions each include two interface regions;
A plurality of concave portions or convex portions are provided in one interface region of the two interface regions,
The one interface region has a larger surface area to surface area ratio compared to the other of the two interface regions;
The ratio of the apparent area of the one interface region per unit area is different for each of the plurality of gradation component regions,
It is a display body in which the reflective layer (18) is selectively formed on the other interface region of the two interface regions.

  Here, a plurality of concave portions or convex portions may be provided in the other interface region.

  Further, it is preferable that a smooth gradation expression is realized as a whole by arranging the plurality of gradation component areas continuously or discontinuously.

  Alternatively, the plurality of gradation component regions may include a further interface region, and the further interface region may be configured as a mirror surface.

  Moreover, it is preferable that the said reflective layer is comprised as a layer containing a metal.

Another example of means for solving the problems of the present invention is a display body (10) including an optical structure forming layer (16) and a reflective layer (18),
The optical structure forming layer (16) includes a first gradation component region (D1) and a second gradation component region (D2) different from the first gradation component region (D1) on the surface thereof,
The first gradation component region (D1) includes a first interface region (I1) and a second interface region (I2);
A plurality of first concave portions or convex portions (16a) are provided in the first interface region (I1);
The first interface region (I1) has a larger surface area to surface area (S1) ratio compared to the second interface region (I2);
The ratio of the apparent area (S2) of the second interface region (I2) per unit area is the first area ratio (A1),
The second gradation component region (D2) includes a third interface region (I3) and a fourth interface region (I4) different from the third interface region (I3);
A third plurality of recesses or protrusions (16c) are provided in the third interface region (I3);
The third interface region (I3) has a larger surface area to surface area (S3) ratio compared to the fourth interface region (I4);
The ratio of the apparent area (S4) of the fourth interface region (I4) per unit area is the second area ratio (A2),
The second area ratio (A2) is larger than the first area ratio (A1);
The reflective layer (18) is selectively formed on the second interface region (I2) of the first interface region (I1) and the second interface region (I2), and the third interface region The display body is selectively formed on the fourth interface region (I4) among (I3) and the fourth interface region (I4).

  According to the present invention, it is possible to provide a display body that exhibits, for example, an anti-counterfeit effect, a decorative effect, or an aesthetic effect. Alternatively, it is possible to provide a display body capable of expressing smooth gradation expression with fine pixels and stepwise density transition.

It is a cross-sectional view which shows an example of the display body of this invention notionally. It is a cross-sectional view which shows notionally another example of the display body of this invention. It is explanatory drawing which shows an example of the formation process of the display body of this invention. It is explanatory drawing which shows another example of the display body of this invention. It is an enlarged view of the A part of FIG. It is an enlarged view of the B part of FIG. An example of the gradation component area | region adjacent to each other is shown. The numerical value in the figure shows an example of the area ratio. An example of a combination of a plurality of gradation component regions spaced apart from each other and a gradation component region adjacent thereto is shown. The numerical value in the figure shows an example of the area ratio. An example in which a plurality of gradation component regions adjacent to each other is taken as one unit is shown. The numerical value in the figure shows an example of the area ratio.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view conceptually showing an example of a preferred embodiment of the display body of the present invention. In FIG. 1, the display body 10 includes an optical structure forming layer 16, a reflective layer 18, and a mask layer 20 in this order. FIG. 2 is a cross-sectional view conceptually showing an example of use of the display body of the present invention. In FIG. 2, the mask layer is not shown. In addition, the same code | symbol is attached | subjected to the component which exhibits the same or similar function in each subsequent figure, and the description is abbreviate | omitted.

<Support>
As shown in FIG. 2, a support 12 can be provided to support the optical structure forming layer 16 when the display 10 is formed. The support 12 supports the optical structure forming layer 16 via a peeling / protecting layer 14 described later. The optical structure forming layer 16 can be bonded to a base material (not shown) via the adhesive layer 22. As the substrate, a known plastic film such as PET can be used.

<Peeling and protective layer>
The peeling / protecting layer 14 is a layer that can be disposed on one surface of an optical structure forming layer 16 described later. For example, the peeling / protecting layer 14 can be disposed between the optical structure forming layer 16 and the support 12. In this case, the optical structure forming layer 16 and the peeling / protecting layer 14 constitute an optical layer, and the optical layer is formed on the support 12.

  The release / protection layer 14 can be formed of a thermoplastic acrylic resin, a chlorinated rubber resin, or a mixture of the chlorinated rubber resin and nitrocellulose, acetylcellulose, cellulose acetate butyrate, polystyrene, or vinyl acetate resin. Moreover, you may comprise by the material which added thermosetting resins, such as a melamine resin, an alkyd resin, an epoxy resin, or a urea resin, to these materials. The peeling / protecting layer 14 can be formed by coating these layer constituent materials on a substrate with a thickness of 0.1 μm to 10 μm using a known coating method such as a gravure method or a micro gravure method. .

<Optical structure forming layer>
The optical structure forming layer 16 may be formed using a resin such as a light transmissive thermoplastic resin, a thermosetting resin, and an ultraviolet ray or an electron beam curable resin (hereinafter also referred to as a photocurable resin). it can. When a thermoplastic resin, a thermosetting resin or a photocurable resin is used as the material of the optical structure forming layer 16, a concave structure or a convex structure can be easily formed on one main surface by transfer using an original plate. it can.

  Examples of the light-transmitting thermoplastic resin include polyethylene terephthalate, polyethylene naphthalate, polycarbonate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, nitrocellulose, polyethylene, polypropylene, acrylic styrene copolymer, vinyl chloride, and the like. Polymethyl methacrylate is mentioned.

  Examples of the light curable thermosetting resin include polyimide, polyamide, polyester urethane, acrylic urethane, epoxy urethane, silicone, epoxy, and melamine resin.

  The photocurable resin refers to a resin that is cured by irradiation with light such as ultraviolet rays and electron beams. A typical resin that undergoes radical polymerization upon irradiation with light includes an acrylic resin having an acryloyl group in the molecule. Examples of the acrylic resin include epoxy acrylate, urethane acrylate, polyester acrylate, and polyol acrylate oligomers or polymers, monofunctional, bifunctional, or polyfunctional polymerizable (meth) acrylic monomers (for example, tetrahydrofurfuryl acrylate, 2-hydroxymethyl acrylate, 2-hydroxy-3-phenoxypropyl acrylate, polyethylene glycol diacrylate, polypropylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate or pentaerythritol tetraacrylate) or oligomers or polymers thereof, or these A mixture of

<Gradation component area>
The optical structure forming layer 16 includes a plurality of gradation component regions on the surface thereof. The plurality of gradation component regions are typically located adjacent to or near each other. The present invention also includes a configuration in which a plurality of gradation component regions are separated from each other. In the example shown in FIG. 1, the optical structure forming layer 16 includes a first gradation component region D1 and a second gradation component region D2 different from the first gradation component region D1 on the surface thereof. When the plurality of gradation component regions are separated from each other, for example, a flat surface region d as shown in FIG. 2 may be arranged between the plurality of gradation component regions.

<Interface area>
The plurality of gradation component regions each include two interface regions. In FIG. 1, the first gradation component region D1 includes a first interface region I1 and a second interface region I2, and the second gradation component region D2 includes a third interface region I3 and a fourth interface region I4. Each of the plurality of gradation component regions only needs to include at least two types of interface regions. The plurality of gradation component regions may further include the same type or different types of interface regions.

  A plurality of concave portions or convex portions are provided in one of the two interface regions. In the first gradation component region D1 of FIG. 1, the first plurality of concave portions or convex portions 16a are provided in the first interface region I1. These first plurality of recesses or projections 16a are preferably arranged two-dimensionally with a minimum center-to-center distance within a range of 200 to 1500 nm. The first plurality of concave portions or convex portions 16a are typically arranged regularly. Each of the first plurality of concave portions or convex portions 16a typically has a forward tapered shape. The depth or height of the first plurality of recesses or protrusions 16a is typically in the range of 0.3 to 0.5 μm. The ratio of the depth or height (hereinafter also referred to as aspect ratio) to the minimum center-to-center distance of the first plurality of concave portions or convex portions 16a is, for example, in the range of 0.5 to 1.5. These structures can be formed during or after the formation of the optical structure forming layer using a plate.

  The other interface region may be unstructured such as a rainbow-colored diffractive structure, a whitish light scattering structure, or a silver-colored aluminum mirror.

  Here, the apparent size of the interface region is the maximum length or width of the orthogonal projection region of the region onto a plane parallel to the region, or the maximum length of the region ignoring the concave portion or the convex portion, or It means width. In the present application, since the gradation component area including the ultrafine reflection layer can be formed by the method described in detail below, various gradation expressions can be realized. In the present application, “gradation” means gradation, blurring, shading, and stepwise change in shading. Furthermore, in addition to continuous density change, step pattern change that exhibits non-continuous density change is also indicated. "Gradation expression" means an expression that realizes these. The gradation expression typically includes everything in which a reflective layer made of metal has a gradation as viewed with the eye and those that mix colors (such as juxtaposed color mixing). In particular, by arranging multiple gradation component areas continuously, gradation component areas including ultra-fine reflective layers are also arranged continuously, realizing smooth gradation expression that could not be achieved by conventional mask printing etc. It is possible.

  One interface region has a larger surface area to surface area ratio than the other interface region. Here, the apparent area of the region means the area of the orthogonal projection of the region onto a plane parallel to the region, or the area of the region ignoring the concave portion or the convex portion. The surface area of a region means the area of the region in consideration of a concave portion or a convex portion. In the first gradation component region D1 of FIG. 1, the portion of the first interface region I1 of the optical structure forming layer 16 is apparently larger than the portion of the second interface region I2 of the optical structure forming layer 16. The ratio of the surface area to the area S1. In this case, the ratio of the surface area to the apparent area S1 of the first interface region I1 is larger than that of the second interface region I2 in the depth or height of the first recess or protrusion 16a. , Become relatively large. On the other hand, the ratio of the surface area to the apparent area S2 of the second interface region I2 is smaller than the value of the depth or height of the second recess or protrusion 16b compared to the case of the first interface region I1. Therefore, it becomes relatively small. In this case, the ratio of the surface area to the apparent area S1 of the first interface region I1 is larger than the ratio of the surface area to the apparent area S1 of the second interface region I2.

  The third plurality of recesses or projections 16c provided in the third interface region I3 of the second gradation component region D2 shown in FIG. 1, and the fourth plurality of recesses provided in the fourth interface region I4 Alternatively, the convex portion 16d is a first plurality of concave portions or convex portions 16a provided in the first interface region I1 of the first gradation component region D1 and a second plurality of second provided in the second interface region I2. Since it can be set as the same or similar structure as the recessed part or the convex part 16b, the description is abbreviate | omitted.

  The ratio (percentage or ratio) of the apparent area of one interface area per unit area differs for each of the plurality of gradation component areas. The unit area can be set to an arbitrary area. For example, a piece of a certain region (also referred to as a unit region) can have a square area of 2 to 80 μm, preferably 3 to 60 μm, more preferably 5 to 10 μm. The distribution of the concave portions or convex portions of each interface region in the unit area (unit region) is typically uniform, but may include gradation expression. The ratio can be selectively determined in the range of 1% to 100%. The gradation can be smoothly expressed by continuously changing the distribution ratio for each of the plurality of gradation component areas. In order to actually measure the above-mentioned ratio of the display body, the ratio can be grasped from the density information based on the presence or absence of the structure by, for example, magnifying observation and imaging with an optical microscope or the like.

<Reflective layer>
The reflective layer 18 can be configured as a layer containing a metal selected from the group consisting of aluminum, silver, tin, chromium, nickel, copper, gold, and alloys thereof, for example. In this case, the reflective layer 18 is typically formed using a vacuum film forming method. Examples of the vacuum film forming method include a vacuum deposition method and a sputtering method. The thickness of the reflective layer is, for example, in the range of 1 nm to 100 nm.

  The reflective layer 18 plays a role of displaying an image with better visibility during display. Further, by providing the reflective layer 18, it is possible to make it difficult to cause damage to the concave portion or the convex portion provided on one main surface of the optical structure forming layer 16.

<Mask layer>
A mask layer 20 can be provided so as to cover the reflective layer 18. The material of the mask layer 20, for _example, can be used MgF 2, Sn, Cr, ZnS , ZnO, Ni, Cu, Au, Ag, TiO 2, MgO, inorganic substances such as SiO ₂ and _Al 2 _{O 3} . Alternatively, as a material for the mask layer 20, for example, an organic substance having a weight average molecular weight of 1500 or less such as a polymerizable compound such as acrylate, urethane acrylate, epoxy acrylate, or the like, or a mixture of the polymerizable compound and an initiator is used to form a radiation curable resin. After vapor deposition, a polymerized by irradiation with radiation can be used. Alternatively, as a material for the mask layer 20, a metal alkoxide or a metal alkoxide deposited in a vapor phase and then polymerized may be used. At this time, after vapor deposition, drying may be performed before polymerization.

  The vapor deposition of the material of the mask layer 20 is performed using, for example, a vacuum evaporation method, a sputtering method, or a CVD method. This vapor deposition is preferably performed at a uniform density in the in-plane direction parallel to the surface of the optical structure forming layer 16.

  Here, on the first material 18a, the ratio of the amount of the second material 20a at the position of the first interface region I1 to the apparent area of the first interface region I1 and the apparent area of the second interface region I2 The second material 20a is stacked so that the ratio of the amount of the second material 20a at the position of the second interface region I2 is equal to each other.

  As described above, the first interface region I1 has a larger ratio of the surface area to the apparent area than the second interface region I2. Therefore, when the set film thickness is determined so that the mask layer 20 has surface shapes corresponding to the surface shapes of the first interface region I1 and the second interface region I2, the first interface region I1 of the second material 20a. The average film thickness of the portion corresponding to is smaller than that of the portion corresponding to the second interface region I2.

  Further, by setting the set film thickness to a smaller value, the portion corresponding to the first interface region I1 is partially opened corresponding to the arrangement of the plurality of concave portions or convex portions 16a, and the second interface. In the portion corresponding to the region I2, the mask layer 20 having a surface shape corresponding to the surface shape of the second interface region I2 can be formed.

  Thus, portions of the mask layer 20 corresponding to the first and third interface regions I1 and I3 have a surface shape corresponding to the surface shape of the region, or a plurality of recesses or protrusions provided in the region. It can be made to open partially corresponding to arrangement | positioning. In the example shown in FIG. 3, the second material 20 a for forming the mask layer 20 is placed on the first material 18 a for forming the reflective layer 18 at the position of the first plurality of concave portions or convex portions 16 a. A partially open discontinuous film is formed.

  The first material 18a and the second material 20a of the second gradation component region D2 shown in FIG. 3 may have the same configuration as the first material 18a and the second material 20a of the first gradation component region D1, respectively. Since it is possible, the description is omitted.

  In the display body, the mask layer may be omitted.

<Reactive material>
In the present invention, the reflective layer and the mask layer are selectively formed on the other interface region of the two interface regions by reacting the second material with the reactive material.

  Typically, the optical structure forming layer 18 provided with the first material 18a and the second material 20a is reacted with a reactive material. The reactive material is a reactive gas or liquid that can cause a reaction with the material of the second material 20a. When an etching solution capable of dissolving the material of the second material 20a is used as the reactive material, the etching solution is typically an alkaline solution such as a sodium hydroxide solution, a sodium carbonate solution, or a potassium hydroxide solution. Is used. Alternatively, an acidic solution such as hydrochloric acid, nitric acid, sulfuric acid, and acetic acid may be used as the etching solution.

<Specific procedure>
The display body of the present invention is formed by the following procedure, for example.
(1) Prepare an image of 2 to 80 μm per pixel.
(2) Make the image monochrome (grayscale) using commercially available software.
(3) Dithering with commercially available software to make a black and white image.
(4) The black and white image is used as data (drawing data) for setting the interface region of the optical structure forming layer.
(5) It is formed by the following method.

  First, an optical structure forming layer 16 including a plurality of first concave portions or convex portions 16a to 16d as shown in FIG. 3 is prepared. In FIG. 3, the plurality of first recesses or projections 16a and the plurality of first recesses or projections 16c have the same structure, and the plurality of second recesses or projections 16b and the plurality of first recesses or projections 16c. Each concave or convex portion of the four concave or convex portions 16d has the same structure. This optical structure forming layer 16 has a surface corresponding to the surface of the final display body.

  Next, the first material 18a is vapor deposited on the whole of the plurality of first concave portions or convex portions 16a to 16d. The first material 18 a is a material for forming the reflective layer 18. The first material 18a forms a continuous film having a surface shape corresponding to the plurality of first concave portions or convex portions 16a to 16d.

  Further, the second material 20a is vapor deposited on the first material 18a. The second material 20 a is a material for forming the mask layer 20.

  In the example shown in FIG. 3, portions of the second material 20a corresponding to the first and third interface regions I1 and I3 correspond to the plurality of concave or convex portions 16a and 16c on the first material 18a, respectively. A partially open discontinuous film is formed. Further, portions of the second material 20a corresponding to the second and fourth interface regions I2 and I4 form a continuous film having a surface shape corresponding to the plurality of concave portions or convex portions 16b and 16d, respectively.

  Subsequently, the first material 18 a and the second material 20 a are exposed to a reactive material that can cause a reaction with the first material 18 a, that is, the material of the reflective layer 18. Then, a reaction with the first material 18a is caused at least at the positions of the first and third interface regions I1 and I3. Here, a case where an etching solution capable of dissolving the first material 18a, that is, the material of the reflective layer 18 is used as an example of the reactive gas or liquid will be described.

  As shown in FIG. 3, the portion corresponding to the second and fourth interface regions I2 and I4 of the second material 20a forms a continuous film, whereas it corresponds to the first and third interface regions I1 and I3. The part forms a discontinuous film partially opened. As a result, portions of the first material 18a corresponding to the first and third interface regions I1 and I3 are more easily etched than portions corresponding to the second and fourth interface regions I2 and I4.

  Moreover, when the part which is not coat | covered with the 2nd material 20a among the 1st material 18a is removed, the opening corresponding to the opening of the 2nd material 20a will arise in the 1st material 18a. If the etching is further continued, the etching of the first material 18a proceeds in the in-plane direction at the position of each opening. As a result, on the first and third interface regions I1 and I3, a portion of the first material 18a supporting the second material 20a is removed together with the second material 20a thereon.

  Accordingly, by adjusting the concentration and temperature of the etching solution, the etching processing time, etc., only the portions corresponding to the first and third interface regions I1 and I3 can be removed from the first material 18a. At this time, the portion corresponding to the first and third interface regions I1 and I3 in the second material 20a is also removed along with the removal of the portion corresponding to the first and third interface regions I1 and I3 in the first material 18a. Removed.

  The display body 10 shown in FIG. 1 is obtained as described above.

  A laminated body of the optical structure forming layer, the reflective layer, and the mask layer was manufactured as follows.

  First, 50.0 parts by mass of urethane (meth) acrylate, 30.0 parts by mass of methyl ethyl ketone, 20.0 parts by mass of ethyl acetate, and 1.5 parts by mass of photoinitiator as materials for the ultraviolet curable resin A composition containing an agent was prepared. As the urethane (meth) acrylate, a polyfunctional one having a molecular weight of 6000 was used. As a photoinitiator, “Irgacure 184” manufactured by Ciba Specialty was used.

  Next, on the transparent PET film whose thickness is 23 micrometers, said composition was apply | coated by the gravure printing method so that a dry film thickness might be set to 1 micrometer.

Next, the original plate provided with a plurality of convex portions was supported on the cylindrical surface of the plate cylinder, and ultraviolet rays were irradiated from the PET film side while pressing the original plate against the previous coating film. Thereby, said ultraviolet curable resin was hardened. At this time, the press pressure was 2 kgf / cm ² , the press temperature was 80 ° C., and the press speed was 10 m / min. Moreover, the ultraviolet irradiation was performed at a strength of 300 mJ / cm ² using a high-temperature mercury lamp. Here, the original plate is created using data (drawing data) for setting the interface region of the optical structure forming layer.

  As described above, an optical structure forming layer having a main surface including a plurality of interface regions was obtained.

  In one interface region of the optical structure forming layer, a plurality of concave portions arranged in a square lattice shape were formed on the entire interface region. The shape of these recesses was a pyramid shape. The minimum distance between the centers of these recesses was 333 nm. And the width | variety of the opening part of these recessed parts was 333 nm, and the depth was 333 nm. That is, in the one interface region, a plurality of recesses having a depth ratio to the width of the groove opening of 333 nm / 333 nm = 1.0 were formed.

  A plurality of regularly arranged grooves were formed in the other interface region of the optical structure forming layer. The cross-sectional shape of these grooves was V-shaped. The pitch of these grooves was 1000 nm. And the width | variety of the opening part of these groove | channels was 1000 nm, and the depth was 100 nm. That is, a plurality of grooves having a ratio of the depth to the width of the groove opening portion of 100 nm / 1000 nm = 0.1 was formed in the other interface region.

  Subsequently, Al was vacuum-deposited as a first material for forming a reflective layer on the main surface of the optical structure forming layer. At this time, the set film thickness of the reflective layer was 50 nm.

Thereafter, MgF ₂ was vacuum deposited as a second material for forming a mask layer on the main surface of the first material layer opposite to the optical structure forming layer. At this time, the set film thickness of MgF ₂ was 20 nm.

  As described above, a laminate of the optical structure forming layer, the reflective layer, and the mask layer was obtained.

  Next, the above laminate was subjected to an etching process. Specifically, this laminate was exposed to an aqueous sodium hydroxide solution having a concentration of 0.1 mol / L and a liquid temperature of 60 ° C. for 7 seconds. As a result, the portion corresponding to the other interface region was removed from the first material layer and the second material layer.

  FIG. 4 is an explanatory view showing another example of the display body of the present invention. FIG. 5 is an enlarged view of a portion A in FIG. 6 is an enlarged view of a portion B in FIG.

  In FIG. 4, a display body 30 is a display body that includes a large number of gradation component areas as a plurality of gradation component areas and realizes continuous and smooth gradation expression. FIG. 4 shows three gradation component regions among these many gradation component regions. When the display body realizes a continuous and smooth gradation expression, the display body includes a large number of gradation component areas, but such a display body includes a plurality of sets of gradation component areas adjacent to each other. It can be understood as a body (FIG. 7). The display body of the present application may be a display body including a continuous gradation expression or a display body including a discontinuous gradation expression. Here, the display body including a continuous gradation expression in this application includes a display body including two arbitrary gradation component areas separated from each other, and a plurality of gradation component areas separated from each other and a gradation structure adjacent thereto. A display body combined with element regions is included (FIG. 8). Further, the display body of the present application includes a display body that is arranged step by step with a plurality of gradation component regions adjacent to each other as one unit (FIG. 9). The discontinuous gradation expression is, for example, a stippled gradation expression, and can be a gradation expression by dithering (error diffusion, pattern, etc.). Note that, within one gradation component area, the first interface area and the second interface area may be distributed regularly, irregularly, uniformly, or so as to realize gradation expression.

  Here, for example, the ratio of the apparent area S2 of the second interface region I2 per unit area is defined as a first area ratio A1. Alternatively, when the apparent area per unit area of the first interface region I1 is S1, and the apparent area per unit area of the second interface region I2 is S2, the unit area of the second interface region I2 per unit area The ratio of the apparent area S2 to the total of the apparent area S1 per unit area of the first interface region I1 and the apparent area S2 per unit area of the second interface region I2 is defined as a first area ratio A1. Also good. In the illustrated example, the first area ratio A1 is 20%.

  Further, the ratio of the apparent area S4 of the fourth interface region I4 per unit area is defined as a second area ratio A2. Alternatively, when the apparent area per unit area of the third interface region I3 is S3 and the apparent area per unit area of the fourth interface region I4 is S4, the fourth interface region I4 per unit area The ratio of the apparent area S4 to the sum of the apparent area S3 per unit area of the third interface region I3 and the apparent area S4 per unit area of the fourth interface region I4 is defined as the second area ratio A2. It is also good. In the illustrated example, the second area ratio A2 is 50%.

  Here, the first area ratio 20% of the first gradation component area D1 was obtained by enlarging observation and imaging with an optical microscope and grasping the ratio from the density information based on the presence or absence of the structure. In this way, gradation expression is performed by area division of the first interface region and the second interface region.

  The present invention can further include a third table region D3 different from the first gradation component region D1 and the second gradation component region D2. The third gradation component region D3 includes a fifth interface region and a sixth interface region, and has a third area different from the first area ratio of the first gradation component region D1 and the second area ratio of the second gradation component region. Although it can have a ratio, the description of the first gradation component region D1 and the second gradation component region D2 can be used, and the description thereof is omitted.

  The present invention is not limited to the description described in the specific embodiments or examples. In particular, the description of the reference signs in the claims is used only for the purpose of facilitating the understanding of the present invention, and the scope of the present invention is not limited to the description of the reference signs. Combinations and various modifications of the elements described in the specific embodiments or examples can be made without departing from the present invention.

DESCRIPTION OF SYMBOLS 10 Display body 12 Support body 14 Peeling and protection layer 16 Optical structure formation layer 16a-16d Several 1st-4th recessed part or convex part 18 Reflective layer 18a 1st material 20 Mask layer 20a 2nd material 22 Adhesive layer D1-D2 1-2 gradation component area I1-I4 1st-4th interface area

Claims (4)

A display (10) comprising an optical structure forming layer (16) and a reflective layer (18),
The optical structure forming layer (16) includes a first gradation component region (D1) and a second gradation component region (D2) different from the first gradation component region (D1) on the surface thereof,
The first gradation component region (D1) includes a first interface region (I1) and a second interface region (I2);
The first interface region (I1) is provided with a plurality of first recesses or projections (16a), and the second interface region (I2) is provided with a plurality of second recesses or projections (16b). And
The first interface region (I1) has a larger surface area to surface area (S1) ratio compared to the second interface region (I2);
The ratio of the apparent area (S2) of the second interface region (I2) per unit area is the first area ratio (A1),
The second gradation component region (D2) includes a third interface region (I3) and a fourth interface region (I4) different from the third interface region (I3);
The third interface region (I3) is provided with a third plurality of recesses or projections (16c), and the fourth interface region (I4) is provided with a fourth plurality of recesses or projections (16d). And
The third interface region (I3) has a larger surface area to surface area (S3) ratio compared to the fourth interface region (I4);
The ratio of the apparent area (S4) of the fourth interface region (I4) per unit area is the second area ratio (A2),
The second area ratio (A2) is larger than the first area ratio (A1);
The reflective layer (18) is on the second plurality of concave portions or convex portions (16b) of the second interface region (I2) among the first interface region (I1) and the second interface region (I2). Selectively formed on the fourth plurality of recesses or protrusions (16d) of the fourth interface region (I4) of the third interface region (I3) and the fourth interface region (I4). Selectively formed ,
The ratio of the apparent area of the reflective layer (18) selectively formed on the fourth plurality of recesses or projections (16d) is higher than that on the second plurality of recesses or projections (16b). A display body in which the display body realizes gradation expression by being larger than a ratio of an apparent area of the reflection layer (18) selectively formed .   The smooth gradation expression as a whole is realized by arranging the first gradation component area (D1) and the second gradation component area (D2) continuously or discontinuously. Display body described in 1.   The said 1st gradation component area | region (D1) or the said 2nd gradation component area | region (D2) contains the further interface area | region, and the said further interface area | region is comprised as a mirror surface. The display body.   The display body according to any one of claims 1 to 3, wherein the reflective layer (18) is configured as a layer containing a metal.