JP2010128096A - Display body and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display body excellent in alkali resistance. <P>SOLUTION: The display body 10 is provided with: a light transmission layer 11 provided with a central region A1 and peripheral regions A2 surrounding the central region A1 on one side main surface; a reflection layer 13 with which the central region A1 in the main surface or only a part thereof is covered; and a protective layer 15 with which the back surface and edge surfaces, and the peripheral regions A2 of the reflection layer 13 are covered, wherein a plurality of first recessed parts or protruded parts RP1 are disposed on the central region A1, and a plurality of second recessed parts or a protruded parts RP2 wherein the average value of ratios of depth to diameter or width of opening parts of recessed parts or ratios of height to diameter or width of bottom parts of protruded parts is larger than that of the plurality of first recessed parts or protruded parts RP1, is provided on the whole of the peripheral region A2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to optical technology.

  It is desirable that authentication items such as 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 imitation and is easy to distinguish from counterfeit or counterfeit is attached to such articles. Such a label is described in Patent Document 1, for example.

By the way, in many display bodies having such a forgery preventing effect, a reflective layer containing a metal such as aluminum is provided in order to improve the visual characteristics.
JP 2005-91699 A

  However, the metal material constituting the reflective layer often has low durability against an alkaline atmosphere (hereinafter referred to as alkali resistance). Therefore, such a display body may have insufficient alkali resistance.

  Then, an object of this invention is to provide the display body excellent in alkali resistance.

  According to the first aspect of the present invention, a light transmission layer having a central region and a peripheral region surrounding the central region on one main surface, and a reflection covering only the central region or a part of the main surface. And a protective layer covering the back and end faces of the reflective layer and the peripheral region, the central region is provided with a plurality of first recesses or protrusions, and the entire peripheral region is A plurality of second parts having a larger average value of a ratio of a depth to a diameter or a width of an opening of a concave part or a ratio of a height to a diameter or a width of a bottom part of the convex part than the plurality of first concave parts or the convex parts There is provided a display body characterized in that a concave portion or a convex portion is provided.

  According to the second aspect of the present invention, a light transmission layer having a central region and a peripheral region surrounding the central region on one main surface, and a reflection covering only the central region or a part of the main surface. And a protective layer covering the back and end surfaces of the reflective layer and the peripheral region, the central region is provided with a plurality of recesses or protrusions, and the peripheral region has an outer periphery of the peripheral region A display body is provided in which one or a plurality of grooves are provided along the surface.

  According to the third aspect of the present invention, a light transmissive layer provided with a plurality of concave portions or convex portions on one main surface, a reflective layer partially covering the main surface, a back surface and an end surface of the reflective layer, and A protective layer covering a region of the main surface that is not covered by the reflective layer, and the shortest distance between the end surface of the reflective layer and the end surface of the protective layer is 1.0 mm or more. Is provided.

  According to a fourth aspect of the present invention, there is provided a method of manufacturing a display body, wherein a light transmission layer in which an image to be displayed by the display body is recorded as a plurality of concave portions or convex portions on a part of one main surface; An alkaline solution is applied via a mask to a laminate of a central layer including a region where the plurality of concave portions or convex portions are provided in the main surface and a peripheral region surrounding the central region. A portion of the metal layer positioned on the peripheral region is dissolved to form a reflective layer covering a part of the main surface, and a back surface and an end surface of the reflective layer and the peripheral region are formed. A method for manufacturing a display body is provided, comprising: forming a covered protective layer.

  According to the present invention, it is possible to provide a display body excellent in alkali resistance.

  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 the first embodiment of the present invention. 2 is a cross-sectional view taken along the line II-II of the display shown in FIG.

  The display body 10 includes a light transmission layer 11, a reflection layer 13, and a protective layer 15. A plurality of concave portions or convex portions RP are provided on one main surface of the light transmission layer 11. The reflection layer 13 partially covers the main surface of the light transmission layer 11. The protective layer 15 covers the region of the back surface and end surface of the reflective layer 13 and the main surface of the light transmission layer 11 that are not covered by the reflective layer 13. The shortest distance between the end face of the reflective layer 13 and the end face of the protective layer 15 is 1.0 mm or more.

  The light transmission layer 11 is typically transparent or almost transparent. However, the light transmission layer 11 may have a slight light scattering property in a range where the visual recognition or detection sensitivity of diffracted light or the like by the plurality of concave portions or convex portions RP is not insufficient.

  The light transmissive layer 11 is, for example, a laminate of a light transmissive substrate and a light transmissive resin layer. In this case, the plurality of concave portions or convex portions RP described above are formed on the main surface on the light transmissive resin layer side. The plurality of concave portions or convex portions RP will be described in detail later.

  As the light transmissive substrate, for example, a light transmissive plastic sheet made of polyethylene terephthalate, polypropylene, polycarbonate, polymethyl methacrylate, polyethylene, or the like is used. The thickness of this light-transmitting substrate is, for example, in the range of 10 μm to 100 μm. The light transmissive substrate may be omitted.

  As a material for the light transmissive resin layer, typically, a photocurable resin, a thermosetting resin, or a thermoplastic resin is used. In this case, the light transmission layer 11 in which a plurality of concave portions or convex portions RP are provided on one main surface can be easily formed by transfer using the original plate.

  Examples of the photocurable resin include polycarbonate resin, acrylic resin, fluorine acrylic resin, silicone acrylic resin, epoxy acrylate resin, polystyrene resin, cycloolefin polymer resin, methylstyrene resin, fluorene resin, polyethylene terephthalate or polypropylene. use. As the thermosetting resin, for example, acrylonitrile styrene copolymer resin, phenol resin, melamine resin, urea resin or alkyd resin is used. As the thermoplastic resin, for example, polypropylene resin, polyethylene terephthalate resin, or polyacetal resin is used. Alternatively, a mixture of these resins and polyisocyanate resin may be used as a material for the light transmissive resin layer. In this case, the light transmissive resin layer exhibits more excellent heat resistance and solvent resistance.

  As described above, a plurality of concave portions or convex portions RP are provided on one main surface of the light transmission layer 11. Each of the plurality of concave portions or convex portions RP has a forward tapered shape such as a pyramid shape, a cone shape, and a semi-spindle shape.

  Each of these concave portions or convex portions RP is, for example, arranged one-dimensionally or two-dimensionally. The concave portion or the convex portion RP has, for example, a square lattice, a rectangular lattice, or a triangular lattice. Or these recessed part or convex part RP may comprise the some groove | channel.

  The plurality of concave portions or convex portions RP typically constitute an optical element. That is, these concave portions or convex portions RP affect the optical characteristics and visual effects of the display body 10.

  The plurality of concave portions or convex portions RP constitutes, for example, a diffraction grating or a hologram. Or these recessed part or convex part RP may comprise the light-scattering body. Or these recessed part or convex part RP may comprise the lens or the prism. For example, when these concave portions or convex portions RP form a diffraction grating or a hologram, the display body 10 displays different colors according to the observation direction. Such visual effects cannot be reproduced by copying with a copying machine or the like. Moreover, it is relatively difficult to imitate or counterfeit such an uneven structure. Therefore, the display body 10 exhibits a better anti-counterfeit effect as compared with the case where these concave portions or convex portions RP are not provided.

  The plurality of concave portions or convex portions RP may be provided only on a part of the main surface of the light transmission layer 11. In this case, the region A1a provided with a plurality of concave portions or convex portions RP in the main surface has the above-described optical characteristics and visual effects. On the other hand, the region A1b where the concave portion or the convex portion RP is not provided in the main surface does not have such optical characteristics and visual effects. That is, these two regions have different optical characteristics and visual effects. Therefore, an image can be displayed on the display 10 by comparing these areas. In FIG. 1, as an example, a case where the region A1a provided with a plurality of concave portions or convex portions RP in the main surface displays an image of the letter “P” is illustrated.

  As described above, the reflective layer 13 partially covers the main surface of the light transmission layer 11 provided with the plurality of concave portions or convex portions RP. Typically, the reflective layer 13 faces at least a part of the plurality of concave portions or convex portions RP. As the reflective layer 13, for example, a metal layer made of a metal material such as aluminum, silver, and alloys thereof is used.

  The thickness of the reflective layer 13 is, for example, in the range of 5 nm to 60 nm, typically in the range of 40 nm to 60 nm. When the thickness of the reflective layer 13 is 40 nm or more, the reflectance of the display body 10 tends to be uniform in the in-plane direction.

  As described above, the protective layer 15 covers the back and end surfaces of the reflective layer 13 and the region of the main surface of the light transmitting layer 11 that is not covered by the reflective layer 13. Therefore, the presence of the protective layer 15 can prevent the back surface and end surface of the reflective layer 13 from being exposed to the surface and side surfaces of the display body 10. Therefore, as will be described in detail later, the reflection layer 13 can be hardly corroded by an alkaline atmosphere such as an alkaline solution. In addition, the presence of the protective layer 15 makes it difficult to grasp the structure of the plurality of concave portions or convex portions RP described above from the outside. Thereby, imitation and forgery of the display body 10 become more difficult.

  As the material of the protective layer 15, a material excellent in alkali resistance is used. The protective layer 15 is an adhesive layer, for example. In this case, the laminated body of the light transmission layer 11 and the reflection layer 13 may be supported by the support body through the adhesive layer. As this support, for example, paper or plastic is used.

  As described above, the shortest distance between the end surface of the reflective layer 13 and the end surface of the protective layer 15 is 1.0 mm or more. In this way, the end surface of the reflective layer 13 can be sufficiently isolated from the side surface of the display body 10. Therefore, even when the display body 10 is exposed to an alkaline atmosphere such as an alkaline solution, contact between the reflective layer 13 and the alkaline atmosphere is relatively difficult to occur. Therefore, in the display body 10, the reflection layer 13 is hardly corroded by an alkaline atmosphere.

Hereinafter, the display body which concerns on the other aspect of this invention is demonstrated.
FIG. 3 is a plan view schematically showing a display body according to the second aspect of the present invention. 4 is a cross-sectional view of the display body shown in FIG. 3 taken along line IV-IV.

  The display body 10 includes a light transmission layer 11, a reflection layer 13, and a protective layer 15. The light transmission layer 11 includes a central region A1 and a peripheral region A2 surrounding the central region A1 on one main surface. A plurality of first concave portions or convex portions RP1 are provided in the central region A1. A plurality of second concave portions or convex portions RP2 are provided in the entire peripheral region A2. The reflection layer 13 covers only the central region A1 or a part of the main surface of the light transmission layer 11. The protective layer 15 covers the back surface and the end surface of the reflective layer 13 and the peripheral region A2 of the light transmission layer 11.

  As materials for the light transmissive layer 11, the reflective layer 13, and the protective layer 15, the same materials as those of the display according to the first aspect are used.

  The plurality of concave portions or convex portions RP1 typically constitute an optical element. That is, these concave portions or convex portions RP1 affect the optical characteristics and visual effects of the display body 10. As a plurality of 1st crevice or convex part RP1, the same structure as a plurality of crevice or convex part RP of a display concerning the 1st mode is adopted, for example.

  FIGS. 3 and 4 illustrate, as an example, a case where a plurality of first concave portions or convex portions RP1 constituting the optical element are provided only in a part of the central region A1. In this case, the region A1a in which the concave portion or the convex portion RP1 is provided in the central region A1 has optical characteristics and visual effects as described above for the display body according to the first aspect. On the other hand, the region A1b in which the concave portion or the convex portion RP1 is not provided in the central region A1 does not have such optical characteristics and visual effects. Therefore, an image can be displayed on the display 10 by comparing these areas. In FIG. 3, as an example, the case where the region A1a provided with the concave portion or the convex portion RP1 in the central region A1 displays an image of the letter “P” is illustrated.

  Each of the plurality of second concave portions or convex portions RP2 has a forward taper shape such as a pyramid shape, a cone shape, and a semi-spindle shape. Each of these concave portions or convex portions RP2 is, for example, arranged one-dimensionally or two-dimensionally. The concave portion or the convex portion RP2 has, for example, a square lattice, a rectangular lattice, or a triangular lattice. Or these recessed part or convex part RP2 may comprise the some groove | channel.

  The plurality of second recesses or projections RP2 is, as compared to the plurality of first recesses or projections RP1, the ratio of the depth to the diameter or width of the opening of the recess, or the diameter of the bottom of the projections or The average value of the ratio of height to width (hereinafter referred to as aspect ratio) is larger. Typically, the minimum value of the aspect ratio of the second recess or protrusion RP2 is larger than the maximum value of the aspect ratio of the first recess or protrusion RP1.

  In these cases, the peripheral area A2 is a flat surface, and the peripheral area A2 has an average aspect ratio that is the same as or smaller than the plurality of first concave portions or convex portions RP1. Compared to the above, diffusion of an alkaline solution or the like through the interface between the peripheral region A2 and the protective layer 15 is less likely to occur. Therefore, in this case, the contact between the reflective layer 13 covering at least a part of the central region A1 and the alkaline solution is less likely to occur. That is, corrosion of the reflective layer 13 due to an alkaline atmosphere is less likely to occur. Therefore, the display body 10 exhibits particularly excellent alkali resistance.

  3 and 4 illustrate the case where one main surface of the light transmission layer 11 is composed only of the central region A1 and the peripheral region A2, the peripheral surface A2 is interposed between the main surfaces. There may be a third region A3 that is adjacent to the central region A1. This area A3 may include a recess or a protrusion, or may not include a recess or a protrusion.

  In the display body 10, the shortest distance between the boundary between the central area A1 and the peripheral area A2 and the outer periphery of the peripheral area A2 is, for example, 0.5 mm or more. The longer the distance, the higher the alkali resistance of the display body 10.

  In contrast to the first concave portion or convex portion RP1, the plurality of second concave portions or convex portions RP2 described above are provided in order to make it more difficult for the alkaline solution or the like to diffuse through the interface. Therefore, the plurality of second concave portions or convex portions RP2 may constitute an optical element or may not constitute an optical element. For example, the second concave portion or convex portion RP2 may not constitute a diffractive structure. That is, these second recesses or projections RP2 may have a structure that does not emit visible light at an observable angle when illuminated with white light. Or these 2nd recessed part or convex part RP2 may have a structure with a very low reflectance. In this case, the portion of the display body 10 corresponding to the second recess or projection RP2 typically looks darker than the portion corresponding to the first recess or projection RP1.

  When the protective layer 15 is an adhesive layer, these concave portions or convex portions RP2 also serve to improve the adhesion between the light transmission layer 11 and the adhesive layer. When this adhesiveness is improved, the above diffusion is less likely to occur. Accordingly, excellent alkali resistance can be achieved.

  FIG. 5 is a plan view schematically showing a display body according to the third aspect of the present invention. 6 is a cross-sectional view taken along the line VI-VI of the display shown in FIG.

  The display body 10 shown in FIG.5 and FIG.6 is provided with the 1 or several groove | channel G along the outer periphery of peripheral area | region A2, instead of several 2nd recessed part or convex part RP2, in peripheral area | region A2. Except for this, the display 10 has the same configuration as that described with reference to FIGS. 3 and 4.

  As described above, the one or more grooves G are provided along the outer periphery of the peripheral region A2. For example, the one or more grooves G are provided such that the length direction thereof is parallel or substantially parallel to the outer periphery of the peripheral region A2. In these cases, the diffusion of the alkaline solution or the like hardly occurs at the interface between the peripheral region A2 and the protective layer 15 in the direction perpendicular or substantially perpendicular to the outer periphery of the peripheral region A2. That is, in the display body 10, it is extremely difficult for an alkaline solution or the like to enter the reflective layer 13 covered with the light transmission layer 11 and the protective layer 15. Therefore, in the display body 10, the reflection layer 13 is hardly corroded by an alkaline atmosphere. Therefore, this display body 10 has excellent alkali resistance.

  Typically, the peripheral area A2 includes a plurality of grooves G. Of the plurality of grooves G, the side wall on the side of the center area A1 closest to the center area A1 and the side wall on the outer periphery side of the peripheral area A2 of the groove farthest from the center area A1 among the plurality of grooves G. The shortest distance between them is, for example, 0.5 mm or more. The longer the distance, the higher the alkali resistance of the display body 10.

  The aspect ratio of the groove G is not particularly limited. However, the aspect ratio of the groove G or the average value thereof is compared with the average value of the aspect ratios of the plurality of first concave portions or convex portions RP1 as in the display body 10 described with reference to FIGS. Larger than that. In particular, it is desirable that the minimum value of the aspect ratio of the groove G is larger than the maximum value of the aspect ratio of the plurality of first concave portions or convex portions RP1. In these cases, the diffusion of an alkaline solution or the like at the interface between the peripheral region A2 and the protective layer 15 is further less likely to occur. Therefore, the alkali resistance of the display body 10 is further improved.

  The display body 10 described with reference to FIGS. 1 to 6 is manufactured as follows, for example.

  First, a light transmission layer 11 in which an image to be displayed on the display body 10 is recorded as a plurality of recesses or projections on a part of one main surface, and a plurality of recesses or projections RP out of the main surface are provided. A laminate of a central region A1 including the region A1a and a metal layer covering the peripheral region A2 surrounding the central region A1 is prepared. In this laminated body, the plurality of second concave portions or convex portions RP2 described above may be provided in the peripheral region A2. Alternatively, the one or more grooves G described above may be provided in the peripheral area A2.

  Next, an alkaline solution is applied to this laminate through a mask that shields only the region where the reflective layer 13 is to be formed on the main surface of the light transmission layer 11. If it carries out like this, only the metal layer which exists on area | regions other than the said area | region can be dissolved. As this mask, for example, a mask that shields only the central region A1 and does not shield the peripheral region A2. In this case, only the part formed on the peripheral region A2 in the metal layer can be dissolved. In this way, the reflective layer 13 that covers only a desired region of the one main surface of the light transmitting layer 11 is obtained.

  Next, the back surface and the end surface of the reflective layer 13 and the peripheral region A <b> 2 are covered with the protective layer 15. For example, an adhesive is applied to the back and end surfaces of the reflective layer 13 and the peripheral area A2, and the adhesive layer made of this adhesive is used as the protective layer 15.

  The display body 10 is obtained as described above.

<Example 1: Production of display body D1>
The display body 10 according to the first aspect was manufactured as follows.
First, the ultraviolet curable urethane acrylate was diluted with a 1: 1 mixed solvent of methyl ethyl ketone (MEK) and toluene. And the obtained dilution liquid was apply | coated on the polyethylene terephthalate (PET) film (Toray Lumirror) with a thickness of 25 micrometers using the gravure roll coater. In this way, a layer made of urethane acrylate resin having a thickness of 2 μm (hereinafter referred to as a light transmissive resin layer) was formed on the PET film.

  Next, the light transmissive resin layer was embossed using a mold. Specifically, a metal mold was prepared in which recesses having a depth of 100 nm were regularly arranged without gaps at a pitch of 1.0 μm in a region corresponding to the central region A1. In addition, the shape of these recessed parts was made into the cone shape.

  And this type | mold was installed in the roll embossing apparatus, and after heating up a roll type | mold to 95 degreeC, this type | mold was pressed against the transparent resin layer. Then, the urethane acrylate resin was cured by irradiating with ultraviolet rays of about 500 mJ. Thereafter, the mold is peeled off, and a plurality of convex portions having a height of 100 nm are regularly arranged without gaps at a pitch of 1.0 μm in a region corresponding to the central region A1 on one main surface of the layer. The convex part of was formed. In this way, a light transmission layer 11 was obtained. In addition, the recessed part or the convex part was not formed in peripheral area | region A2. That is, the peripheral area A2 is a flat surface.

  Next, a metal layer made of aluminum was formed on the entire main surface of the light transmission layer 11 provided with a plurality of convex portions by vacuum deposition. The thickness of this metal layer was about 40 nm.

  Subsequently, a masking ink was printed on the metal layer using a gravure printing plate. Specifically, only the region corresponding to the central region A1 on the back surface of the metal layer was masked. Then, the sodium hydroxide solution was applied and the metal layer which existed in the area | regions other than the said area | region was dissolved. In this way, a reflective layer 13 was obtained which covered only the central region A1 of one main surface of the light transmitting layer 11.

  Finally, an adhesive was applied to the back and end surfaces of the reflective layer 13 and the peripheral region A2, and an adhesive layer as the protective layer 15 was obtained. Then, the paper was laminated through this adhesive layer. The shortest distance between the end face of the reflective layer 13 and the end face of the protective layer 15 (hereinafter referred to as the shortest distance d1) was 5.0 mm.

  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>
Instead of setting the shortest distance d1 to 5.0 mm, a display body was manufactured in the same manner as described for the display body D1 except that the distance was set to 2.0 mm. Hereinafter, this display body is referred to as “display body D2”.

<Example 3: Production of display body D3>
Instead of setting the shortest distance d1 to 5.0 mm, a display body was manufactured in the same manner as described for the display body D1 except that the distance was set to 1.4 mm. Hereinafter, this display body is referred to as “display body D3”.

<Example 4: Production of display body D4>
Instead of setting the shortest distance d1 to 5.0 mm, a display body was manufactured in the same manner as described for the display body D1 except that the distance was set to 1.0 mm. Hereinafter, this display body is referred to as “display body D4”.

<Example 5: Production of display body D5 (comparative example)>
Instead of setting the shortest distance d1 to 5.0 mm, a display body was manufactured in the same manner as described for the display body D1 except that the distance was set to 0.8 mm. Hereinafter, this display body is referred to as “display body D5”.

<Example 6: Production of display body D6 (comparative example)>
Instead of setting the shortest distance d1 to 5.0 mm, a display body was manufactured in the same manner as described for the display body D1 except that the distance was set to 0.4 mm. Hereinafter, this display body is referred to as “display body D6”.

<Example 7: Production of display body D7 (comparative example)>
A display body was manufactured in the same manner as described for the display body D1, except that the etching step using the sodium hydroxide solution was omitted. That is, instead of setting the shortest distance d1 to 5.0 mm, a display body was manufactured in the same manner as described for the display body D1 except that the distance was set to 0 mm. Hereinafter, this display body is referred to as “display body D7”.

<Example 8: Production of display body D8 (comparative example)>
A display body was manufactured in the same manner as described for the display body D7 except that the formation of the protective layer 15 was omitted. Hereinafter, this display body is referred to as “display body D8”.

<Durability test of display bodies D1 to D8>
Durability tests were performed on the display bodies D1 to D8 manufactured as described above.

(Alkali resistance test)
Each of the display bodies D1 to D8 was immersed in an aqueous sodium hydroxide solution for 24 hours. Then, the presence or absence of the change of the external appearance of each display body was confirmed visually. When the appearance of the display body has not changed at all, “◎” is given. When the appearance has hardly changed, “◯” is given. When the appearance has changed slightly, “△” is given. The case where a large change occurred was evaluated as “x”. The results are shown in Table 1.

  As can be seen from Table 1, by setting the shortest distance d1 to 1.0 mm or more, excellent alkali resistance could be achieved.

(Solvent resistance test)
Each of the display bodies D1 to D8 was immersed in ethanol and acetone for 24 hours. Thereafter, changes in appearance were evaluated in the same manner as in the alkali resistance test. The results are shown in Table 1.

  As can be seen from Table 1, the display bodies D1 to D8 had excellent ethanol resistance and acetone resistance.

(Heat resistance test)
Each of the display bodies D1 to D8 was heated for 3 minutes using an oven at 150 ° C. Thereafter, changes in appearance were evaluated in the same manner as in the alkali resistance test. The results are shown in Table 1.

  As can be seen from Table 1, the display bodies D1 to D8 had excellent heat resistance.

<Example 9: Production of display body D9>
The display body 10 according to the second aspect was manufactured as follows.
First, a plurality of first protrusions are provided in the center area A1 and a plurality of second protrusions are provided in the entire peripheral area A2 in the same manner as described for the display body D1, except that the shapes of the molds are different. A light transmission layer 11 provided with a convex portion was prepared. In addition, the shape of the 1st convex part and the 2nd convex part was made into conical shape.

  The diameter at the bottom of each of the first protrusions was 1.0 μm. The height of each of the first protrusions was 200 nm. That is, the average value of the aspect ratios of these first convex portions was 200 nm / 1.0 μm = 0.2.

  The diameter at the bottom of each of the second protrusions was 1.0 μm. The height of each second convex portion was 300 nm. That is, the average value of the aspect ratios of these second convex portions was 300 nm / 1.0 μm = 0.3.

  The shortest distance between the boundary between the central area A1 and the peripheral area A2 and the outer periphery of the peripheral area A2 (hereinafter referred to as the shortest distance d2) was 5.0 mm.

  Next, the reflective layer 13 was provided only in the central region A1 in the main surface of the light transmission layer 11 in the same manner as described for the display body D1. Thereafter, the protective layer 15 covering the back and end surfaces of the reflective layer 13 and the peripheral region A2 of the light transmitting layer 11 was formed in the same manner as described for the display body D1.

  The display body 10 was obtained as described above. Hereinafter, this display body is referred to as “display body D9”.

<Example 10: Production of display body D10>
Instead of setting the shortest distance d2 to 5.0 mm, a display body was manufactured in the same manner as described for the display body D9 except that the distance was set to 2.0 mm. Hereinafter, this display body is referred to as “display body D10”.

<Example 11: Production of display body D11>
Instead of setting the shortest distance d2 to 5.0 mm, a display body was manufactured in the same manner as described for the display body D9 except that the distance was set to 1.4 mm. Hereinafter, this display body is referred to as “display body D11”.

<Example 12: Production of display body D12>
A display body was manufactured in the same manner as described for the display body D9 except that the shortest distance d2 was set to 1.0 mm instead of 5.0 mm. Hereinafter, this display body is referred to as “display body D12”.

<Example 13: Production of display body D13>
A display body was manufactured in the same manner as described for the display body D9 except that the shortest distance d2 was set to 0.5 mm instead of 5.0 mm. Hereinafter, this display body is referred to as “display body D13”.

<Example 14: Production of display body D14>
A display body was manufactured in the same manner as described for the display body D9, except that the shortest distance d2 was set to 0.3 mm instead of 5.0 mm. Hereinafter, this display body is referred to as “display body D14”.

<Durability test of display bodies D9 to D14>
Durability tests were performed on the display bodies D9 to D14 manufactured as described above. Specifically, an alkali resistance test, a solvent resistance test, and a heat resistance test were performed in the same manner as described above. The results are shown in Table 2 together with the results for the display body D7.

  As can be seen from Table 2, the display bodies D9 to D14 had better alkali resistance than the display body D7. In particular, the display bodies D9 to D13 had a better alkali resistance than the display body D14. The display bodies D9 to D14 had excellent solvent resistance and heat resistance.

<Example 15: Production of display body D15>
The display body 10 according to the third aspect was manufactured as follows.
First, except that the shapes of the molds are different, light transmission in which a plurality of convex portions are provided in the central area A1 and a plurality of grooves are provided in the peripheral area A2 in the same manner as described for the display body D1. Layer 11 was prepared. In addition, the shape of the some convex part was made into the cone shape. The cross-sectional shape of the plurality of grooves was an isosceles triangle. The plurality of grooves were formed along the outer periphery of the peripheral area A2.

  The diameter at the bottom of each of the plurality of convex portions was 1.0 μm. The height of each of the plurality of convex portions was 200 nm. That is, the average value of the aspect ratio of these convex portions was 200 nm / 1.0 μm = 0.2.

  The width of each opening of the plurality of grooves was 1.0 μm. The depth of each of the plurality of grooves was 300 nm. That is, the average aspect ratio of these grooves was 300 nm / 1.0 μm = 0.3.

  The shortest distance between the side wall on the side of the central region A1 of the groove closest to the central region A1 among the plurality of grooves and the side wall on the outer peripheral side of the peripheral region A2 of the groove farthest from the central region A1 among the plurality of grooves. (Hereinafter referred to as the shortest distance d3) was 5.0 mm.

  Next, the reflective layer 13 was provided only in the central region A1 in the main surface of the light transmission layer 11 in the same manner as described for the display body D1. Thereafter, the protective layer 15 covering the back and end surfaces of the reflective layer 13 and the peripheral region A2 of the light transmitting layer 11 was formed in the same manner as described for the display body D1.

  The display body 10 was obtained as described above. Hereinafter, this display body is referred to as “display body D15”.

<Example 16: Production of display body D16>
Instead of setting the shortest distance d3 to 5.0 mm, a display body was manufactured in the same manner as described for the display body D15 except that the distance was set to 2.0 mm. Hereinafter, this display body is referred to as “display body D16”.

<Example 17: Production of display body D17>
Instead of setting the shortest distance d3 to 5.0 mm, a display body was manufactured in the same manner as described for the display body D15 except that the distance was set to 1.4 mm. Hereinafter, this display body is referred to as “display body D17”.

<Example 18: Production of display body D18>
Instead of setting the shortest distance d3 to 5.0 mm, a display body was manufactured in the same manner as described for the display body D15 except that the distance was set to 1.0 mm. Hereinafter, this display body is referred to as “display body D18”.

<Example 19: Production of display body D19>
Instead of setting the shortest distance d3 to 5.0 mm, a display body was manufactured in the same manner as described for the display body D15 except that the distance was set to 0.5 mm. Hereinafter, this display body is referred to as “display body D19”.

<Example 20: Production of display body D20>
Instead of setting the shortest distance d3 to 5.0 mm, a display body was manufactured in the same manner as described for the display body D15 except that the distance was set to 0.3 mm. Hereinafter, this display body is referred to as “display body D20”.

<Durability test of display bodies D15 to D20>
Durability tests were performed on the display bodies D15 to D20 manufactured as described above. Specifically, an alkali resistance test, a solvent resistance test, and a heat resistance test were performed in the same manner as described above. The results are shown in Table 3 together with the results obtained for the display body D7.

  As can be seen from Table 3, the display bodies D15 to D20 had better alkali resistance than the display body D7. In particular, the display bodies D15 to D19 had better alkali resistance than the display body D20. The display bodies D15 to D20 had excellent solvent resistance and heat resistance.

The top view which shows roughly the display body which concerns on the 1st aspect of this invention. Sectional drawing along the II-II line of the display body shown in FIG. The top view which shows roughly the display body which concerns on the 2nd aspect of this invention. Sectional drawing along the IV-IV line of the display body shown in FIG. The top view which shows roughly the display body which concerns on the 3rd aspect of this invention. Sectional drawing along the VI-VI line of the display body shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Display body, 11 ... Light transmissive layer, 13 ... Reflective layer, 15 ... Protective layer, A1 ... Center region, A1a ... Region, A1b ... Region, A2 ... Peripheral region, G ... Groove, RP ... Concave or convex RP1 ... 1st recessed part or convex part, RP2 ... 2nd recessed part or convex part.

Claims (7)

A light-transmitting layer comprising a central region on one main surface and a peripheral region surrounding the central region; a reflective layer covering only the central region or part of the main surface; a back surface of the reflective layer; A protective layer covering the end surface and the peripheral region,
The central region is provided with a plurality of first recesses or projections, and the entire peripheral region has a depth relative to the diameter or width of the opening of the recess compared to the plurality of first recesses or projections. A plurality of second concave portions or convex portions having a larger average value of the ratio of the height or the ratio of the height to the diameter or width of the bottom of the convex portion is provided.   The display body according to claim 1, wherein a shortest distance between a boundary between the central region and the peripheral region and an outer periphery of the peripheral region is 0.5 mm or more. A light-transmitting layer comprising a central region on one main surface and a peripheral region surrounding the central region; a reflective layer covering only the central region or part of the main surface; a back surface of the reflective layer; A protective layer covering the end surface and the peripheral region,
A display body, wherein a plurality of concave portions or convex portions are provided in the central region, and one or a plurality of grooves are provided in the peripheral region along an outer periphery of the peripheral region.   The peripheral region is provided with the plurality of grooves, of the plurality of grooves, the side wall on the side of the central region of the groove closest to the central region, and among the plurality of grooves, the groove farthest from the central region. The display body according to claim 3, wherein the shortest distance between the peripheral region and the outer peripheral side wall is 0.5 mm or more. A light transmissive layer provided with a plurality of concave portions or convex portions on one main surface, a reflective layer partially covering the main surface, a back surface and an end surface of the reflective layer, and the reflective layer among the main surfaces A protective layer covering an uncoated region,
The shortest distance between the end face of the reflective layer and the end face of the protective layer is 1.0 mm or more.   The display body according to claim 1, wherein the protective layer is an adhesive layer. A method of manufacturing a display body, wherein a light transmission layer in which an image to be displayed on a part of one main surface is recorded as a plurality of recesses or protrusions, and the plurality of recesses among the main surfaces Alternatively, an alkaline solution is applied through a mask to a laminate of a metal layer covering a central region including a region provided with a convex portion and a peripheral region surrounding the central region, and the peripheral portion of the metal layer Forming a reflective layer covering a part of the main surface by dissolving a portion located on the region;
And forming a protective layer covering the back and end surfaces of the reflective layer and the peripheral region.

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